JPH0477790B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a self-lifting formwork device used when constructing a concrete wall surface sequentially in the height direction.
In particular, the present invention relates to a self-lifting formwork device that simplifies the drive mechanism for movement, including changing the angle of the formwork, and facilitates control operations during movement operations.

<<Prior art>> As the most basic self-lifting formwork device of this type, one of the present applicants previously proposed Japanese Patent Application Laid-Open No. 60-435705.
We have developed a self-lifting formwork device as shown in the publication.

This formwork device consists of a fixed frame that is removably installed on an existing concrete wall using fixing fittings, and a formwork located above the fixed frame, which is telescopically connected via a lifting jack. The action is as follows.

Concrete is poured into the formwork, and after it hardens, the lifting jacks are extended to raise the formwork.
Next, the fixing metal fittings of the fixing frame located below the jack are removed, the jack is shortened and the fixing frame is raised, and in this state the fixing frame is fixed to a new concrete pouring surface.

By repeating this series of operations like an inchworm, the concrete wall is successively constructed upwards, which is much easier than installing and removing formwork using conventional cranes, etc. Able to work efficiently.

[Problems to be Solved by the Invention] However, although this self-lifting formwork device is suitable when the wall surface has the same slope, it causes a change in the slope of the formwork with respect to the slope of the fixed frame. If that was the case, it would not be suitable.

In other words, in structures such as dams, the slope of the concrete pouring surface at the bottom is relatively gentle and becomes steeper towards the top. From the top, it became impossible to fit.

Therefore, when trying to change the inclination angle of the formwork in response to this type of slope change,
During movement, it is necessary for the formwork to separate from the concrete placement surface and to change the angle in this state, and a mechanism must be added to accommodate these two operations. On the other hand, if adding this type of mechanism makes the equipment itself more complicated and its operation more complicated, the equipment itself becomes more expensive, and the merits of self-elevating formwork are lost. The speed of certain movement operations may also be impaired.

In other words, when a large number of jacks are provided for posture changes including angle changes, the number of operation items increases by the number of jacks. In addition, one device is not provided for one formwork; in reality, at least one pair of devices is required to maintain the rigidity of the device, and a control mechanism is required to interlock each device. must be added, which not only complicates the device itself but also complicates the operation and control system.

The present invention has been made based on the above background, and its purpose is to be able to cope with angle changes using the minimum necessary mechanism, thereby reducing the complexity of the device itself and the operation and control system. To provide a self-lifting formwork device that can minimize the number of molds.

<Means for Solving the Problems> In order to achieve the above object, the self-lifting formwork device of the present invention includes a fixed frame that is removably installed on an existing concrete wall surface, and a fixed frame that is fixed on the fixed frame. a cylinder, a guide sleeve for a rising guide slidably inserted into the cylinder, a support plate fixed to the tip of the guide sleeve, and disposed on the cylinder and parallel to the guide sleeve. a first hydraulic jack whose tip is connected to the support plate; and a first hydraulic jack which is swingably supported by the tip of the support plate via a pin, and whose lower edge is removable from the upper edge of the existing concrete wall. and a second hydraulic jack that connects one end to the support plate and the other end to the formwork to hold the formwork and the fixed frame at an arbitrary angle. This is the summary.

《Operation》 Remove the lower edge of the formwork from the concrete wall,
When the second jack is shortened, the formwork rotates about the pin as a fulcrum and moves away from the wall surface, and as the first jack expands, the formwork rises. In the raised position, by extending the second jack and stopping the second jack when the formwork reaches the desired angle, the formwork can be held at that angle, and then the lower edge of the formwork is fixed to the existing concrete wall. This completes the formwork installation. Thereafter, the fixed frame is removed from the concrete wall surface, the second jack is shortened, and the fixed frame is rotated about the pin as a fulcrum to separate it from the wall surface. In this state, the first jerk is shortened and the fixed frame is raised. In the raised position, if you extend the second jack, the fixed frame will be installed on the wall,
By fixing the fixed frame to the wall again in this state, one lifting cycle is completed.

<<Example>> Hereinafter, an example of the present invention will be described in detail using the drawings.

1 to 3 show the overall structure of the self-lifting formwork device.

In the figure, 1 is a formwork, and 2 is a pair of fixed frames arranged below the formwork.

Each fixed frame 2 is arranged parallel to the lower part of the formwork 1, and its both ends are fixed to the existing concrete wall surface by detachable fixing bolts 3.

A cylinder 4 is fixed to the center of each fixed frame 2 vertically perpendicular thereto by welding or the like, and a first hydraulic jack 5 is arranged parallel to the back of the cylinder 4.

A guide sleeve 6 for guiding the rise is slidably inserted into the cylinder 4, and a support plate 7 is integrated at the tip thereof. Further, the tip of the plunger 8 protruding from the hydraulic jack 5 is axially connected to the support plate 7, so that the support plate 7 can be relatively raised and lowered in accordance with the stroke of the plunger 8.

The lower end of the support plate 7 is swingably connected to the lower end of the vertical frame 9 connected to the formwork 1 via a pin 10. Further, the upper end of the support plate 7 is connected to a pin 1 at the lower end of the second hydraulic jack 11.
It is connected via 2.

The tip of the plunger 13 protruding from the second hydraulic jack 11 is attached to the vertical frame 9 with a pin 14.
The formwork 1 is thereby held in an angular posture corresponding to the amount of protrusion of the plunger 13.

A pair of formwork fixing frames 15 are fixed to the formwork 1 in parallel on both sides of the vertical frame 9.

Each formwork fixed frame 15 is connected to the fixed frame 2
The lowermost end, which is the end protruding from the lower edge of the formwork 1, is equipped with an electric motor for raising and lowering the pad 16 that contacts the existing concrete wall surface. A type jacking device 17 is arranged.

Moreover, dummy bolts 18 are provided on the upper part of each formwork fixing frame 15 to protrude toward the wall surface, and similarly formwork fixing bolts 19 are provided on the lower part thereof to protrude.

The spacing between the bolts 18 and 19 and the spacing between the fixing bolts 3 on the fixed frame 2 side are the same, and are equal to the upward stroke of the first hydraulic jack 5. And the dummy bolt 18
An anchor bolt 20 is attached in advance to the protruding end of the dummy bolt 18, and the anchor bolt 20 is buried in the concrete by pulling out the dummy bolt 18 when the poured concrete has hardened.

When the formwork 1 is raised in this state, the fixing bolt 19 moves to a position facing the anchor bolt 20 that has just been buried in accordance with the stroke of the first hydraulic jack 5. Therefore, the fixing bolt 19 can be screwed into the female threaded portion of the anchor bolt 20. In the same way, the fixing bolt 3 on the fixed frame 2 side can be fixed using the same anchor bolt 20 the next time it is lifted, and there is no need to drill a new hole and screw in the bolt each time it is moved. becomes.

As shown in FIG. 4, the vertical frame 9 is pivotally supported at its lower part by a pin 21 fixed to the formwork 1 side so as to be able to move slightly in the horizontal direction. They are connected via an adjustment jack 22, and by the expansion and contraction movement of the jack 22,
The formwork 1 can be moved left and right by the length of the pin 21 relatively, correcting the lateral deviation during the lifting operation, and adjusting the position of each fixing bolt 3, 19 to the correct position. It's getting old.

It should be noted that if each fixing bolt 3, 19 and dummy bolt 18 are attached to each frame 2, 15 with some allowance in the vertical direction, the longitudinal adjustment with respect to the anchor bolt 20 will be adjusted along with the horizontal adjustment operation. Manual adjustment is possible, providing flexibility in fixing operations.

Next, the construction of a concrete wall using the self-lifting formwork apparatus configured as described above will be described with reference to FIGS. 5a to 5h.

In addition, in the figure, horizontal lines L ₁ to _Lo indicate the uppermost position at the time of concrete pouring, and the interval between each horizontal line L ₁ to _Lo is determined by the first hydraulic jack 5.
determined by the stroke of Further, the L-shaped portion in each figure is a workbench, and is used as a work platform for work such as attaching and detaching the bolts 3, 18, and 19.

Figure a shows the state in which concrete is being poured, the first hydraulic jack 5 is reduced, the second hydraulic jack 11 is kept at an appropriate length, and the fixed frame 2 is placed directly below the formwork 1. Position it on the same slope as this, and in that state, screw each fixing bolt 3, 19 into the anchor bolt 20 buried in the existing concrete wall surface C ₁ , C ₂ in advance, and fix the formwork 1 and fixing frame 2. Existing concrete wall C ₁ ,
Fixed along C ₂ .

In this state, concrete is placed on the inner surface of the formwork 1. Further, an anchor bolt 20 is attached to the tip of the dummy bolt 18, and the anchor bolt 20 is buried inside the upper side of the finished concrete wall surface _C3 during concrete pouring work.

From b onwards in the same figure, the order of the lifting operation is shown. First, once the concrete has solidified, in order to lift it to the next section, remove the dummy bolts 18 and the fixing bolts 19 to lift the formwork 1. It will be removed from the existing concrete wall _C2 . Next, when the electric jacking device 17 is operated upward, the pad 16 is separated from the concrete wall surface _C2 , and the formwork 1 becomes able to tilt around the pin 10 of the support plate 7.

Next, when the second hydraulic jack 11 is shortened, the formwork 1 tilts around the pin 10 of the support plate 7 as a fulcrum, as shown in b, and separates from the concrete wall surface _C2 . In this state, by extending the first hydraulic jack 5, the formwork 1 is raised by the stroke as shown in c.

At this point, when the second hydraulic jack 11 is extended and returned to the original state shown in a, the formwork 1 is placed at a slope equal to the slope of the existing concrete wall surface _C3 finished in the above process. Touches the top of concrete wall _C3 . In this state, the anchor bolt 20 buried in the previous concrete placement step faces the fixing bolt 19, and the fixing bolt 19 can be screwed into the female threaded portion formed in the anchor bolt 20. At this time, the lateral displacement of the formwork 1 can be adjusted by the jacks 22, and the fixing bolt 19 can be screwed in with the anchor bolt 20 positioned at the correct position.

After the fixing work is completed, the electric jacking device 17 is activated to move the pad 16 onto the existing concrete wall C ₃
If the anchor bolt 20 is joined to the dummy bolt 18 in this state, preparation for concrete pouring is completed.

First, fixing bolts 3 at both ends of fixed frame 2
Remove the second hydraulic jack 11 as shown in e.
When the fixed frame 2 is shortened, the fixed frame 2 is relatively tilted and separated from the existing concrete wall surface _C1 .
Next, when the first hydraulic jack 5 is retracted, the fixed frame 2 is positioned directly below the formwork 1 as shown in f.

Next, by extending the second hydraulic jack 11 as shown in g, the fixed frame 2 comes into contact with the existing concrete wall surface _C2 directly below the formwork 1 as shown in h. In this state, the fixing bolt 3 faces the anchor bolt 20 into which the fixing bolt 19 on the formwork 1 had been screwed, and can be screwed into it, completing the fixing of the fixing frame 2, and Finish the ascent cycle.

Thereafter, concrete is placed inside the formwork 1 in the same manner, and by repeating the process of moving the formwork 1 upward, the concrete wall surface is
It is possible to construct C ₄ to _{C o} sequentially.

In addition, in this example, only the case where the formwork is raised at the same slope has been explained, but if the slope is changed midway, the stroke when the second hydraulic jack is extended can be changed accordingly. Formwork can be held in an angular position. In this case, it is not possible to fix using anchor bolts, so the fixing bolt can be screwed into the concrete wall while drilling a new hole.

Further, in the embodiment, a pair of first and second hydraulic jacks 5, 11 are used to perform the lifting operation for one formwork. Therefore, it is necessary to make the speed and stroke of each jack uniform.
In this case, each operating state may be detected by a rotary encoder, and the operating hydraulic circuit of each hydraulic cylinder may be feedback-controlled in accordance with the detected output difference of each rotary encoder.

Further, the extension and contraction operations of each of the hydraulic jacks can be performed by remote control, but this operation may be performed while keeping in touch with the on-site workers while keeping an eye on the work situation, or by controlling the amount of extension and contraction of the hydraulic jacks. Since the angle of the formwork and fixed frame is determined according to the above, the angle is set in advance based on the detected value of the rotary encoder, and the expansion and contraction operation is performed automatically according to this set value, and only small adjustments are made manually. You can do it like this.

<<Effects>> As described above in detail with reference to the embodiments, according to the present invention, the formwork and the fixed frame see-saw through the alternating expansion and contraction operations of the first and second hydraulic jacks. The fixed frame can also be raised, and the separation operation and angular posture of the formwork and fixed frame from the casting surface can be performed by appropriately setting the stroke of the second hydraulic jack. Therefore, according to the present invention, posture changes accompanied by angle changes and attachment/detachment of the formwork and fixed frame can be performed with the minimum number of hydraulic jacks, so the mechanism can be manufactured at low cost without complicating the mechanism. can. Also,
The series of operations is simple, as it is only necessary to operate two hydraulic jacks alternately, and the number of control items is kept to a minimum.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall configuration of a self-lifting formwork apparatus according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, FIG. The figure is a partially enlarged sectional view taken along the - line in Figure 1, and Figure 5.
Figures a to h are explanatory sectional views showing one lifting cycle of the self-lifting formwork device. 1...Formwork, 2...Fixed frame, 3,19...
...Fixing bolt, 4...Cylinder, 5...First hydraulic jack, 6...Guide sleeve, 7...Support plate, 11...Second hydraulic jack, 18...Dummy bolt, 20...Anchor bolt.

Claims (1)

[Claims] 1. A fixed frame detachably installed on an existing concrete wall, a cylinder fixed on the fixed frame, and a guide sleeve for a rising guide slidably inserted into the cylinder. a support plate fixed to the distal end of the guide sleeve; a first hydraulic jack disposed on the cylinder parallel to the guide sleeve and having its distal end connected to the support plate; and the support plate. A formwork is swingably supported at the tip of the frame via a pin, and the lower edge is removably fixed to the upper edge of the existing concrete wall, one end is connected to the support plate, and the other end is connected to the formwork. A self-lifting formwork device comprising a second hydraulic jack connected to the frame to hold the formwork and the fixed frame at an arbitrary angle. 2. Dummy bolts and fixing bolts arranged on the same vertical axis at intervals equal to the stroke of the first hydraulic jack are provided at the upper and lower parts of the formwork, respectively, and the fixing frame is provided with dummy bolts and fixing bolts arranged on the same vertical axis at intervals equal to the stroke of the first hydraulic jack. Fixing bolts are provided on the line at positions equal to the spacing between the bolts,
Claim 1, wherein each of the fixing bolts is screwed into the anchor bolt while the anchor bolt screwed into the dummy bolt is buried in the concrete wall surface. Self-lifting formwork equipment.