JP2000204534A - Form for preparing transverse joint of concrete dam and joint preparing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide forms capable of being diverted for preparing a transverse joint in the surface-shaped construction method of a concrete dam while providing the joint preparing method of the concrete dam being easy to be executed without requiring special heavy machinery for the execution of works. SOLUTION: The forms 10 are used for preparing the transverse joint in the surface-shaped construction method of the concrete dam, approximately the same shaped two oppositely arranged face plates 11, 12 are connected by a hinge 16 in one end sides 11a, 12a, and an angle adjusting device 13 for expanding and contracting the angle of the two face plates centering around the hinge 16 is installed. The forms 10 are disposed in upright at a place, where concrete must be placed, concrete is placed successively on both sides of the forms 10, and the forms are mold-released from concrete and extracted to an upper section by shrinking the angle of the two plate bodies and fillers are injected to a section after the forms are extracted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork for forming a horizontal seam in a concrete dam planar construction method, and a method for forming a horizontal joint of a concrete dam.

[0002]

2. Description of the Related Art In a surface construction method for a concrete dam, concrete is cast, spread with a bulldozer, and then a horizontal joint is formed with a vibration jointing machine, and compacted with a vibration roller. In this transverse seam, as the joint material 39, the thickness is almost 0.
Use a metal plate such as an iron plate, stainless steel plate or zinc-plated iron plate with a tip of 27 mm, a width of 90 to 100 cm, and a depth of about 40 to 100 cm, and the tip of the metal plate is bent.
As shown in FIG.
And a vibrator 37 provided at the tip of an arm 36 extending from the base machine 35, and a blade 38 provided at the lower end of the vibrator 37.
5A, first, as shown in FIG. 5 (a), the bent end of the joint material 39 is hung on the lower end of the blade 38 of the vibrating joint cutter and vibrated by the vibrator 37. As shown in FIG. 5 (b), after the concrete is pressed into a predetermined depth, the blade 38 is lifted up.

[0003] Since the conventional joint material is entirely formed of a metal plate, the weight per sheet is large, the handling is not easy, and the material cost is relatively high. In addition, since the width of the embankment body decreases as the altitude increases, the work area becomes narrow at the time of construction at high elevation, the construction equipment becomes congested, and the vibration jointing machine causes a collision accident with other construction equipment Danger also increases.

[0004]

In order to solve the above-mentioned problems, prior to casting concrete, a steel formwork made of an iron plate or a steel material is installed at a place where a horizontal joint is formed.
This formwork is buried in concrete, and is used as it is as a joint of a horizontal joint. However, installation of the steel formwork is time-consuming and time-consuming, and requires a large number of skilled workers to secure a lift schedule. In addition, there is a disadvantage that the material cost is high because all the steel mold materials remain buried in the concrete.

The present invention focuses on the above-mentioned problems of the prior art,
The problem is to solve this problem. The problem is that there is no need to bury the concrete in the concrete and it can be diverted. Is to do.

Another object of the present invention is to provide a method for forming a joint of a concrete dam which does not require a heavy machine such as a conventional vibration jointing machine and does not require a large number of skilled workers due to its easy installation. Is to do.

[0007]

In order to solve the above-mentioned problems, the present invention provides a formwork for forming a horizontal seam in a planar construction method of a concrete dam. Characterized in that an angle adjusting means for enlarging and reducing the angle of the two plate members around the one end is provided. Provide formwork for

[0008] In the horizontal joint forming mold of the present invention, in order to connect the two plates so as to be rotatable at one end, one ends of the two plates can be connected by a hinge. .

Further, as the angle adjusting means, for example,
A screw rod can be used. That is, a screw hole is formed at a position opposite to the two plate bodies, a screw rod having screw threads formed in opposite directions at least at both ends is screwed into the screw hole, and the screw rod is turned in a predetermined direction. Thereby, the angle of the two plates can be enlarged and reduced about the connecting portion.
Further, as the angle adjusting means other than the screw rod, for example,
The angle can be adjusted by attaching a spring between the two plates.

Further, in the present invention, two plate members of substantially the same shape which are opposed to each other are rotatably connected at one end, and the angle of the two plate members is enlarged and reduced about the one end. A mold formed so as to be able to stand is erected at a place where concrete is to be poured with one end thereof facing down, concrete is sequentially cast on both sides of the form, and after a predetermined time, the angle of the two plate bodies is increased. The present invention provides a joint method for a joint of a concrete dam transverse joint, characterized in that the formwork is released from concrete by reducing the size of the mold to form an extraction groove upward, and a filler is injected into the groove.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. FIG. 1 is a perspective view showing one embodiment of a horizontal joint forming form of the present invention, and FIG. 2 is a longitudinal sectional view of the horizontal joint forming form of FIG.
FIG. 3 is a front view of one face plate of the horizontal joint forming form shown in FIG. 1 as viewed from inside. 4 (1) to 4 (5) are simplified cross-sectional views showing one embodiment of the joint forming method of the present invention.

In FIG. 1 to FIG. 3, a mold frame 10 is formed by connecting two face plates 11, 12 having substantially the same shape with a plurality of hinges 16 at lower end sides 11a, 12a. 13 is formed.

The angle adjusting device 13 includes a circular operation plate 1.
3 and a screw rod 13b fixed at right angles to the center of both sides thereof, and both ends 13c and 13c of the screw rod 13b are formed.
The screw ridges with d are formed in mutually opposite spiral directions. 2 and 3 are provided on the facing surfaces of the face plates 11 and 12, respectively.
As shown in the figure, a plurality of reinforcing members 14, 1 are provided in both the vertical and horizontal directions.
5 are provided, and screw holes 11b and 12b are formed near the upper end side in directions corresponding to the screw threads at both ends of the screw rod 13b.
Therefore, both ends 13c and 13d of the screw rod 13b are
When the operation plate 13 is rotated in a predetermined direction by screwing into the screw holes 11b and 12b of the face plates 11 and 12, respectively, the face plate 1
1 and 12 rotate about the hinge 16 in the direction of arrow P (shown in FIG. 2), and the separation angle θ decreases. Operation plate 13
Is rotated in the opposite direction, the separation angle θ between the face plates 11 and 12 is obtained.
Can be enlarged.

The face plates 11 and 12 can be formed to have dimensions of, for example, about 50 to 100 cm in length, 100 to 200 cm in width, and about 1 to 3 cm in thickness. When the face plates 11 and 12 have such a size, the hinge 16 and the angle adjusting device 13 can be provided at, for example, three places indicated by dotted lines in FIG.

Next, a method of forming a horizontal seam in a surface method of a concrete dam using the formwork 10 will be described.
This will be described with reference to FIGS. First, FIG.
As shown in (1), the formwork 10 is erected on the lower layer concrete 30 with the edges 11a and 11b of the face plates 11 and 12 facing down, and the support member 20 made of steel pipe or the like and the anchor 2
1, and the angle adjusting device 13 adjusts the separation angle between the face plates 11, 12 according to the joint width of the transverse joint. next,
As shown in FIG. 4 (2), concrete 31 is cast on one side of the formwork 10, and after laying the concrete 31 and compacting it, after approximately 0.5 hours, the support member 20 and the anchor 21 is removed from the mold 10. And FIG.
As shown in (3), the concrete 32 is cast on the opposite side of the formwork 10, spread and spread, and compacted. After about 4 to 8 hours have passed since the concrete 32 was cast, the face plate 11, The angle adjusting device 13 is operated so as to reduce the separation angle between the concrete plates 12 and 12, thereby releasing the face plates 11 and 12 from the concretes 31 and 32. After releasing the face plates 11 and 12,
As shown in FIG. 4D, when the formwork 10 is pulled up, a groove 33 is formed between the concretes 31 and 32. Finally, as shown in FIG. 4 (4), if a room temperature injection type joint material such as asphalt or urethane resin is injected as a filler into the groove 33, the joint of the lateral joint of the concrete dam is formed. You.

[0016]

According to the formwork of the present invention, two plates are rotatably connected at one end, and the angle between the plates can be enlarged and reduced about the one end. Even after the concrete is cast on both sides of the form, the form can be easily released from the concrete and taken out by reducing the angle between the plates. Therefore, it is easy to install, release and remove the formwork, does not require skilled labor for construction, and reduces not only construction cost but also material cost compared to the conventional formwork buried in concrete can do.

In the method for forming joints at the lateral joint of a concrete dam according to the present invention, concrete is sequentially cast on both sides of the formwork, and then the formwork is released from the concrete to form a withdrawal groove upward, and the groove is filled. Since the material is injected, without using a conventional joint creation device such as a vibration joint cutter,
Joints for concrete dams can be created. Therefore, it is possible to eliminate the occurrence of a contact accident due to the congestion between the joint creation device, the heavy equipment and the worker in the conventional joint creation method. Also, after the concrete has hardened to some extent, the filler is injected into the grooves to create the joints. Compared with the conventional method of pressing a joint plate made of metal or the like into the concrete, the concrete after the joint plate is pressed is re-used. There is an advantage that compaction can be omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a horizontal joint forming mold according to the present invention.

FIG. 2 is a longitudinal sectional view of the horizontal seam forming mold of FIG. 1;

FIG. 3 is a front view of the face plate of the horizontal seam forming mold of FIG.

FIGS. 4 (1) to (5) are simplified sectional views showing one embodiment of the joint forming method of the present invention.

FIGS. 5A to 5C are side views showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Formwork (Form for forming horizontal joint) 11, 12 Face plate (plate) 11a, 12a One end side of face plate 13 Angle adjusting device (Angle adjusting means) 16 Hinge 30, 31, 32 Concrete 34 Sealing material (filling material)

Claims (2)

[Claims] 1. A formwork for forming a horizontal joint in a planar method of a concrete dam, comprising two plates of substantially the same shape which are opposed to each other and are rotatably connected at one end, A horizontal joint forming mold provided with an angle adjusting means for enlarging and reducing the angle of the two plate bodies around the side. 2. An oppositely disposed two plates of substantially the same shape are rotatably connected at one end, and the angles of the two plates are formed so as to be able to expand and contract about the one end. The completed formwork,
By standing upright at the place where concrete is to be poured with the one end side down, concrete is sequentially placed on both sides of the formwork, and after a predetermined time, the angle of the two plates is reduced, whereby the mold is formed. A joint forming method for a joint of a concrete dam, characterized in that a frame is released from concrete to form an upper extraction groove, and a filler is injected into the groove.