JPH0425383B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention Industrial Application Field This invention relates to a sliding frame device for constructing a cylindrical reinforced concrete structure (hereinafter referred to as a structure) whose horizontal cross section changes with height. It is something.

BACKGROUND TECHNOLOGY In order to move and maintain the posture of a yoke that supports dual opposing inner and outer cylindrical sliding forms for pouring concrete into the walls of a structure, beams are usually placed in the diametrical direction of the structure. Alternatively, as shown in Figure 6, the tension of the spoke wires due to the gravity and centripetal force of the center ring R supported by the spoke wires S at the center of the structure instead of the beam, and Connecting material between yokes 2
Forced deformation of the (X-shaped cross frame shown in Fig. 7) (the spindle 6 is rotated by the jack 7 attached to the head tether 1c, and the angle of the link 2a is changed by raising and lowering the slide block 2b screwed thereto) ) to maintain its horizontal movement and posture (Special Publication No. 52-290866).

In this figure, an auxiliary yoke column 1a'' is attached in order to make the outer yoke column 1a tiltable in the diametrical direction of the structure, that is, in the direction of the double arrow in FIG. It is attached to the yoke pillar 1a.

Problems to be Solved by the Invention In the conventional device, the cross frame was only a vertical one that connected the columns of each yoke (inner column 1a' or auxiliary column 1a''), so its lateral deformation, that is, the In order to resist undesirable deformation due to movement of the yoke in the diametrical direction indicated by the double-headed arrow in Fig. 7, an inner cross frame 2' provided also between the inner columns 1a' of the yoke and a cross frame provided between the outer columns are used. Two parallel rows of connecting materials, with other links 2 facing both ends of the links 2a that make up these
Both ends of a' were connected by a link connecting material 2d to form a rectangular frame, and by attaching a place 2e within the frame, rigidity against lateral deformation of the cross frame was imparted. There was a problem. That is, since the brace 2e was placed in a position covering directly above the concrete placement site, it became an obstacle to reinforcing bar assembly, concrete placement, and other operations (hereinafter referred to as operations). Especially when assembling reinforcing bars,
Since the rebar cage could not be made in advance, it had to be assembled on site.

In addition, two rows of cross frames 2,
Since the distance between the rows of 2' is constant, in order to change the interval or inclination within the yoke of the two columns to which the cross frame is attached, an auxiliary yoke column 1a'' is required, as shown in Fig. 6, for example. If you omit
For example, when forming a part on the wall of a structure where the thickness of the frame wall suddenly increases at a certain height, such as the jaw of a hopper shown in Figure 8, the column spacing within the yoke is required. It was difficult to temporarily expand the market.

B. Structure of the Invention Means for Solving Problems One of the cross frames is omitted and a horizontal cross frame is provided under the work floor instead, and a new cross frame suitable for this is proposed. That is, in a sliding formwork device that has a connecting material between each yoke that can be expanded and contracted so as to change the relative positional relationship between the yokes, the connecting material connects the two inner and outer parts of each yoke. Of the pillars,
A vertical cross-frame-like joint that connects at least one of the columns and at least one of the work floor support beams attached to the inner and outer yoke columns along the axial direction of the yoke beam. A yoke spacing adjustment device consisting of a horizontal cross-frame-like tether, at least one of which is provided with a drive device for forcibly deforming the yoke, in particular, a drive device is attached to the horizontal cross-frame-like tether,
Furthermore, the vertical cross-frame joints are links whose central portions are mutually pivotally connected, and the horizontal cross frames are links whose central portions are not pivotally connected.

Function: Since the horizontal cross-frame-like joints prevent deformation (displacement) of the relative positions of the structures between the yokes in the horizontal direction, it is not necessary to attach vertical joints to each of the yoke columns on both sides to form two rows as in the past. Since there is no link brace 2e on the upper part of the frame wall, the work is easier, and a reinforcing bar cage T can be inserted as shown in FIG. Further, since the link connection 2d is not required, the distance between the yoke columns 1a and 1a' can be easily changed.

On the other hand, when the drive device for forced deformation is installed on a horizontal joint, the force is accurately transmitted to the formwork because it is close to the weir plate (formwork), and it is at the same level as the spoke wire, so it is eccentric. There is little distortion of the yoke due to

Furthermore, when the horizontal connection is made into a cross-frame structure in which two links that are not pivotally connected in the center are arranged in an intersecting manner as shown in Fig. 3, compared to the conventional parallel ruler-shaped pantograph mechanism, as shown in Fig. 7. This has the advantage that there is no need to attach something similar to the gusset plate 2c shown in FIG.

Embodiment As shown in Fig. 1, a yoke beam 1b has its middle portion pivoted to a lifting jack J that climbs on a rod Ro set up in a concrete frame wall C that is being poured.
The yoke columns 1a, 1a' attached to both ends of are connected at the upper part by a yoke head connection 1c,
A yoke 1 is formed. Furthermore, regarding the yoke pillars and the means for connecting them to the head tethers, please refer to the patent application filed in 1983.
-Explained in detail in No. 193843.

The upper ends of a pair of yoke legs 1d, 1d, whose middle portions are pivotally connected to a bracket 3 to be described later, are attached to the yoke beam so as to be forcibly movable along the yoke beam.
The yoke leg supports the weir plate 9 at its lower portion so as to be able to swing around the pivot portion.

Furthermore, as shown in FIG. 5, between each yoke, the center part of the link 2a is pivoted as before, except that it is arranged only between the outer yoke pillars 1a, 1a.
A shaped vertical cross frame 2 is arranged, the lower end of each link is pivotally connected to a predetermined position of a pillar, and the upper end is pivotally connected to a locking piece, that is, a slide block 2b that moves along another pillar, and this slide By using the yoke column connection 2 of the parallel ruler mechanism, which shares the block with other adjacent cross frames (indicated by dotted lines in the figure), each yoke column is connected in a state where the distance between them can be changed while keeping them parallel. .

On the other hand, at the lower parts of the inner and outer yoke columns 1a', 1a, there are brackets 3 extending in the direction of the center of the structure, that is, in the direction orthogonal to the frame wall, as shown in FIG.
is installed. Although this bracket is normally used as a support beam for the work floor scaffold 10, it has other important functions in the present invention. That is, as shown in FIG. 3, a horizontal link 5 is installed between adjacent brackets 3, 3, thereby forcibly changing the spacing between the yokes in order to correspond to changes in the cross section of the structure. That is, the links 5a are intersected between each bracket or between the guide rails 3a attached in an extended manner as shown in FIG. The other end is pivotally connected to a slide block 4 sliding on the guide rail of an adjacent yoke to form a horizontal link 5, and each slide block is shared with the adjacent horizontal link.

The movement of the slide lock is accomplished by the rotation of a spindle 6 which penetrates and is screwed into the slide lock as shown in FIG. The spindle is rotated by a hydraulic jack 7 attached to the bracket via a ratchet clutch 8 (Japanese Patent Publication No. 55-17194).

The amount of movement of the slide block is determined by taking into account the geometrical relationship that corresponds to the change in the yoke spacing caused by this and the change in the length of the spoke wire S extending from the center ring R supported at the center of the structure. It is determined by a functional relationship with the amount of movement of the upper slide block 4s to be locked.

Therefore, when changing the cross section of a structure at a certain height, the horizontal connecting jack 7 and the spoke wire jack 7s that actuate the slide blocks 4s are simultaneously operated to move each slide block by a predetermined amount. Then, the toggle joint mechanism of the horizontal links widens or narrows the distance between the yokes, and the spoke wires expand and contract accordingly, maintaining a constant tension. At that time, the vertical connection follows this, but due to the commonality of slide block 2b,
Since there is a force that tries to keep all the yoke intervals constant, there is less risk of the frame wall becoming distorted.

C. Effects of the Invention Since the vertical cross frame 2', the link connections 2d, and the link braces 2e on one side can be omitted, assembling reinforcing bars and placing concrete become easier.

Furthermore, it is also possible to use a reinforcing bar T as shown in FIG.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention,
Figure 1 is a vertical cross-sectional view, Figure 2 is an enlarged view of the part in Figure 1, and Figure 3 is a - cross section (top view) of Figure 1.
4 shows a view taken along the - arrow in FIG. 3, and FIG. 5 shows a side view. FIG. 6 is a cross-sectional view showing a conventional cross-frame type sliding formwork device, and FIG. 7 is a perspective view of the framework of the cross-frame viewed from the opposite direction from FIG. 6. FIG. 8 is a sectional view showing an example of the jaw portion of the structure. 1... Yoke, 1a, 1a'... Column, 1a''... Auxiliary column, 1b... Yoke beam, 1c... Head connection, 1
d... Yoke leg, 2, 2'... Vertical connecting member (cross frame), 2a... Link, 2b... Slide lock, 2c... Gusset plate, 2d...
...Link connection, 2e...Link brace, 3...
...Bracket, 3a...Guide rail, 3b...
Link attachment part, 4,4s...Slide block, 5...Horizontal connection, 5a...Link, 6,6
s...spindle, 7, 7s...jacket, 8,
8s...Ratchet clutch, 9...Shelter board (formwork), 10...Working floor, C...Concrete frame wall, Ro...Rod, S...Spoke wire,
T...Reinforced cage, R...Center ring, J...Rising jack.

Claims (1)

[Claims] 1. A sliding formwork device for constructing a cylindrical reinforced concrete structure having a section whose cross section changes with height, wherein the relative positional relationship between each yoke is variable. In a device having a connecting material that is expandable and contractible, the connecting material connects a vertical cross-frame-like connecting member that connects at least one of the two inner and outer columns that make up each yoke, and a yoke beam. Consisting of a horizontal cross-frame-like joint that connects at least one of the work floor support beams attached to the inner and outer yoke columns along the axial direction, in order to forcibly deform at least one of the beams. A yoke interval adjustment device for a sliding formwork device, characterized in that it is equipped with a drive device. 2. The yoke interval adjustment device for a sliding formwork device according to claim 1, wherein the drive device is attached to a horizontal cross-frame-like link. 3. According to claim 1 or 2, the vertical cross-frame-like joints are composed of links whose central parts are mutually pivotally connected, and the horizontal cross frame is composed of links whose central parts are not pivotally connected to each other. Yoke spacing adjustment device for sliding formwork equipment.