JPH0549762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a concrete casting method for constructing a concrete structure such as a dam, and a formwork apparatus used therefor.

"Prior Art" Conventionally, the common method for placing concrete for this type of dam is to use a sliding formwork. In this method, concrete is poured into a formwork, and after the concrete has hardened, the formwork is slid upward to replace the formwork. At that time, a lifting machine such as a crane is used to The formwork is once removed from the concrete surface and placed on the next lift. In this case, a worker first climbs onto the external scaffolding, slings the slide formwork, and loosens the formwork's fixing bolts. Once the work is completed, the worker gets off the scaffold. Next, the crane operator operates the crane to rearrange the formwork. Once the refilling is complete, workers will once again climb onto the external scaffolding and use a crane to secure the suspended formwork to the existing concrete using fixing bolts.

"Problems to be Solved by the Invention" However, the conventional concrete placing method has the following drawbacks.

(1) The above work usually requires about one conductor, one crane operator, and two workers, and the use of a crane causes an increase in costs.

(2) Work at heights using scaffolding is dangerous.

(3) Since sliding formwork is used, construction on curved concrete surfaces is impossible.

(4) Slide formwork requires removal from the concrete surface each time it is replaced.

The present invention was made in view of the above problems, and
The purpose of this invention is to provide a concrete casting method and formwork device that reduce construction costs, ensure worker safety, enable construction on curved concrete surfaces, and eliminate the need for formwork removal work. do.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the method according to the present invention includes a concrete casting form that is separated into an upper formwork and a lower formwork and attached to a center frame. After placing the lower formwork so that it is fixed to the existing concrete and placing the upper angle at a predetermined angle to the lower formwork, concrete is poured inside the upper formwork, and the concrete is placed at a predetermined angle. After hardening, the upper formwork is fixed to this concrete, and the center frame and the lower formwork are rotated around the upper formwork using the upper formwork as a base, and the lower formwork is placed on top of the upper formwork. After arranging the lower formwork at a predetermined angle, concrete is placed inside the lower formwork, and this process is repeated to construct a concrete structure.

Further, the device according to the present invention includes an upper formwork and a lower formwork for forming the wall surface of a concrete structure to be constructed, an upper support member fixed to the outside of the upper formwork, and an upper support member fixed to the outside of the lower formwork. a lower support member, a center frame rotatably connected to the upper support member and the lower support member;
a locking means for maintaining the relative positions of the center frame and the upper and lower formwork; and an upper part for rotating at least the center frame around the upper formwork using the upper formwork as a base. A drive device and a lower drive device that rotates at least the center frame around the lower formwork using the lower formwork as a base, and a fixing device that fixes the upper formwork and the lower formwork to concrete that has been placed, respectively. It is characterized by comprising means.

In this invention, the locking means is a lock pin that detachably holds the center frame, the upper support member, and the lower support member, and the center frame has a center portion at the left or right end that connects to the drive device. It is desirable to have a slip ring for power supply.

"Example" Hereinafter, an example of the present invention will be described with reference to the drawings. 1 to 9 show an embodiment of the present invention. First, the concrete formwork apparatus of the present invention will be explained using FIGS. 1 to 3. In the figure, reference numeral 1 is a concrete formwork device. The concrete formwork device 1 includes an upper formwork 2, a lower formwork 3, upper rotation shafts 4, 4, lower rotation shafts 5, 5, a center frame 6, upper support members 7, 7, lower support members 8, 8, and an upper part. Locking means 9, 9, lower locking means 10, 10, upper drive device 11, lower drive device 12, and upper fixing means 1
3, 13 and lower fixing means 14, 14 as the main components.

As shown in FIGS. 2 and 3, the lower formwork 3 is fixed to the wall surface of an existing concrete 15 with anchor bolts (lower fixing means) 14.
Above the lower formwork 3, the upper formwork 2 is arranged at a predetermined angle (vertically in this figure).
The back side of these formworks 2 and 3 (direction of arrow A) is the first
As shown in FIGS.
It is reinforced by... In addition, upper formwork 2
Upper rotating shafts 4, 4 are provided on the back side of the upper mold at the vertices of an isosceles triangle formed with the height of the inner surface of the upper mold 2 (direction of arrow B) as the base. On the back side of the frame 3, lower rotating shafts 5, 5 are provided at apex positions of an isosceles triangle formed with the height dimension of the inner surface side of the lower formwork 3 as the base.

A center frame 6 is rotatably attached to the upper rotating shafts 4, 4 and the lower rotating shafts 5, 5. Further, the apex portion of a triangular upper support member 7 is rotatably attached to the upper rotating shaft 4, and the bottom portion of the upper support portion 7 is fixed to the frames 20, 20, . . . of the upper formwork 2. has been done.
Further, the apex portion of a triangular lower support member 8 is rotatably attached to the lower rotating shaft 5, and the bottom portion of the lower support member 8 is fixed to the frames 20, 20, . . . of the lower formwork 3. has been done.

The center frame 6 connects V-shaped upper brackets 22, 22 and lower brackets 23, 23 which are rotatably attached to the upper rotation shaft 4 and the lower rotation shaft 5, and the upper bracket 22 and the lower bracket 23. , connecting members 24, 24 to be fixed
and fixing members 25, 25 for connecting and fixing the upper brackets 22, 22 and the lower brackets 23, 23, respectively. The upper bracket 22 and the lower bracket 23 are formed into a U-shaped cross section with an opening on the outside, and grooves 22a and 23a thereof are configured to be engageable with the upper support member 7 and the lower support member 8, respectively. They also function as stoppers. Furthermore, a slip ring 26 for feeding power to a drive device, which will be described later, is provided at the center of the connecting member 24. Further, the upper bracket 22 has an upper lock pin (upper locking means) 9, which maintains the relative position of the center frame 6 and the upper formwork 2 by detachably connecting the upper bracket 22 and the upper support member 7. 9, the lower bracket 23 also includes the lower bracket 23 and the lower support member 8.
Lower lock pins (lower locking means) 10, 10 are provided which maintain the relative positions of the center frame 6 and the lower formwork 3 by detachably connecting them. The center frame 6 and the upper formwork 2
The upper rotating shaft 4 is connected between the upper formwork 2 as a base and
An upper driving device 11 is provided between the center frame 6 and the lower formwork 3 to rotate the center frame 6 and the lower formwork 3 around the lower rotating shaft 5 using the lower formwork 3 as a base. a lower drive device 12 that rotates the center frame 6 and the upper formwork 2;
is provided. The upper drive device 11 includes a motor 26 disposed approximately in the center of a fixing member 25 of the center frame 6, an arm 27 having a groove fixed to the shaft of the motor 26 via a reducer, and an upper formwork 2. It consists of an engaging pin 29 fixed to a support rod 28 fixed to the frames 20, 20 . . . and slidably engaged with a groove of the arm 27. Similarly, the lower drive device 12 includes a motor 30 disposed approximately in the center of the fixing member 25 of the center frame 6, and an arm (not shown) having a groove fixed to the shaft of the motor 30 via a reducer.
and an engaging pin (not shown) fixed to the support rod 31 fixed to the frames 20, 20, . . . of the lower formwork 3 and slidably engaged with the groove of the arm. It's on.

Finally, upper anchor bolts (upper fixing means) 13, 13 and lower anchor bolts are provided at the upper part of the upper formwork 2 and the upper part of the lower formwork 3, respectively, for fixing the concrete formwork device 1 to the poured concrete. (Lower fixing means) 14, 14 are provided.

Next, a concrete formwork device (hereinafter simply referred to as “formwork device”) 1 configured as described above is prepared.
This paper describes the concrete pouring method used to construct the dam wall.

(1) First, as shown in Fig. 4, the formwork device 1 is fixed to the existing concrete 15a by the lower anchor bolts 14, and new concrete 15b is poured inside the upper formwork 2. has been done. In this case, in the formwork apparatus 1, the center frame 6 is fixed to the upper formwork 2 via the upper support member 7 by the upper lock pin 9, and to the lower formwork 3 via the lower support member 8 by the lower lock pin 10. The lower formwork 3
An upper formwork 2 is vertically disposed above.

(2) Next, newly placed concrete 15b
5, as shown in FIG. A center frame 6 and a lower formwork 3, which are fixed to each other by a lower lock pin 10, are rotated around a rotating shaft 4. At this time, as shown in FIG. 1, as the motor 26 rotates, the arm 27
rotates while sliding on the engagement pin 29 in the groove. However, since the engagement pin 29 is fixed to the upper formwork 2, it does not move, and on the contrary, the center frame 6 to which the motor 26 is fixed rotates around the upper rotating shaft 4. At this time, the concrete 15b has hardened and the upper formwork 2 is fixed to the concrete 15b by the anchor bolts 13.

(3) Furthermore, when the center frame 6 and the lower formwork 3 are rotated around the upper rotation axis 4, the lower formwork 3 rotates 180 degrees with respect to the upper formwork 2, as shown in FIG. At this point, the upper bracket 22 abuts the other side of the upper support member 7. In this state, the motor 26 is stopped to stop the rotation of the lower formwork 3.

(4) Next, the upper lock pin 9 is locked to fix the center frame 6 and the upper formwork 2, and the lower lock pin 10 is released to rotate only the lower formwork 3 around the lower rotating shaft 5. At this time, as the motor 30 rotates, the arm rotates while sliding on the engagement pin in the groove. In this case, the center frame 6 to which the motor 30 is fixed does not move because it is fixed to the concrete 15b via the upper formwork 2 by the upper lock pin 9, and the lower formwork 3 to which the engagement pin is fixed rotates at the bottom. It will rotate around axis 5.

(5) Furthermore, when the lower formwork 3 rotates, the lower formwork 3 moves against the upper formwork 2, as shown in Fig. 8.
When the lower support member 8 is rotated 360 degrees and placed vertically on the upper part of the upper formwork 2, the lower support member 8 is attached to the lower bracket 2.
Abuts on the other side of 3. In this state, motor 3
0, the rotation of the lower formwork 3 is stopped.

(6) Next, as shown in FIG. 9, the center frame 6 and the lower formwork 3 are fixed with the lower lock pins 10, and the anchor bolts
4a, new concrete 15c is placed inside the lower formwork 3, resulting in the state shown in FIG.

Thereafter, by repeating the steps (1) to (6) above, the dams are successively constructed.

Therefore, as described above, according to this concrete placing method and concrete formwork device, there is a risk that the formwork device 1 will fall because one of the two formworks 2 and 3 is always fixed to the concrete. It is safe and does not require any lifting equipment such as a crane for reloading, resulting in labor and manpower savings and cost reductions, as well as eliminating the need for demolding work during reloading. Further, by changing the set angles of the upper formwork 2 and the lower formwork 3, it becomes possible to perform curved concrete surface construction. Further, by automating the attachment and detachment of the upper lock pin 9 and the lower lock pin 10, it is possible to realize full automation of the formwork device 1, and it is also possible to fully automatically control a series of concrete pouring processes by sequence control.

In this embodiment, a motor is used as the drive device, but a hydraulic drive device may be used instead.

"Effects of the Invention" As described above in detail, according to the present invention,
The following effects can be obtained.

(1) Concrete formwork equipment can be unmanned, and there is no need to use lifting equipment such as cranes to replace formwork, reducing costs.

(2) Since concrete formwork equipment can be automated, workers can be freed from dangerous work at heights.

(3) By changing the setting angle of the upper formwork and the lower formwork, it is possible to perform construction on curved concrete surfaces.

(4) Since the formwork is replaced while rotating, there is no need to remove the formwork.

[Brief explanation of the drawing]

Figures 1 to 9 show one embodiment of the present invention, in which Figure 1 is a perspective view showing the entire concrete formwork device, and Figure 2 is a side view of the concrete formwork device installed in concrete. Figure 3 is the second
The front view and FIGS. 4 to 9 are explanatory diagrams for explaining concrete being poured using a formwork device. 1... Concrete formwork device, 2... Upper formwork, 3... Lower formwork, 4... Upper rotating shaft, 5...
Lower rotating shaft, 6...Center frame, 7...Upper support member, 8...Lower support member, 9...Upper lock pin (upper locking means), 10...Lower lock pin (lower locking means) 11... Upper drive, 1
2... Lower drive device, 13... Upper anchor bolt (upper fixing means), 14... Lower anchor bolt (lower fixing means).

Claims (1)

[Scope of Claims] 1. A formwork for concrete pouring that is separated into an upper formwork and a lower formwork and attached to a center frame is arranged so that the lower formwork is fixed to the existing concrete, and the lower formwork is attached to a center frame. After placing the upper formwork on the formwork at a predetermined angle, concrete is poured inside the upper formwork, and after the concrete has hardened, the upper formwork is fixed to this concrete, and the upper formwork is placed at a predetermined angle. The center frame and the lower formwork are rotated around the upper formwork using the center frame as a base, and the lower formwork is placed on the upper formwork at a predetermined angle, and then the inside of the lower formwork is A concrete pouring method that is characterized by pouring concrete into the concrete and then repeating this process to construct a concrete structure. 2. Concrete pouring according to claim 1, wherein the vertical angle between the upper formwork and the lower formwork is set to a predetermined angle, thereby forming an inclination on the concrete wall surface. Method. 3. Upper formwork and lower formwork for forming the wall surface of the concrete structure to be constructed; an upper support member fixed to the outside of the upper formwork; and a lower support member fixed to the outside of the lower formwork; a center frame rotatably connected to the upper support member and the lower support member; locking means for maintaining the relative positions of the center frame and the upper and lower molds; and the upper mold. An upper drive device that uses the frame as a base to rotate at least the center frame around the upper formwork; and a lower drive device that uses the lower formwork as a base to rotate at least the center frame around the lower formwork. and,
A concrete formwork apparatus comprising fixing means for fixing the upper formwork and the lower formwork to cast concrete, respectively. 4. The concrete formwork apparatus according to claim 3, wherein the locking means is a lock pin that detachably holds the center frame and the upper and lower support members. 5. The concrete formwork apparatus according to claim 3 or 4, wherein the center frame is provided with a slip ring for supplying power to the drive device at the center of the left end or right end thereof.