JPH01271510A - Method and device for constructing filler slab for dam concrete facing - Google Patents

Abstract

PURPOSE:To enhance the operating easiness for a strip form by suspending it at an anchor driven at the top of a slope face, and by placing filler slab while the strip form is winched up. CONSTITUTION:An anchor 1 is driven at the top of a slope face, and a filler slab 33a 3s placed while a strip form 4 mounted horizontally on a rail 3 laid on the slope face is winched up through a wire 6. When the strip form 4 has moved to the top of the slope face, a liftup mechanism is operated to cause lifting-up from the concrete surface into which the strip form 4 is just driven, followed by separating. Then winches 5, 5 are operated so as to descend the strip form 4. When descend is completed, a transverse motion roller 11 is grounded by operating a grounding operation mechanism. In this condition, the strip form itself is moved to the filler slab placing region 33 of next execution lane.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to concrete facing of slopes in dam construction work and the like.

In particular, the present invention relates to a method and apparatus for constructing a triangular filler slab formed between a toe slab at the lower peripheral edge of a slope and a main slab continuing to the top.

(Prior Art) In construction work for dams of various structures including fill dams, it is known to cast a concrete slab on a slope to construct a so-called concrete facing.

Conventionally, when applying concrete facing to a slope,
As shown in FIG. 7, first, the slope 31 is divided into construction lanes 1 to 0 of a constant width, and a toe slab 32 is poured around the lower end of the slope 31.

Next, the triangular area connected to this toe slab 32, that is, the area surrounded by the dotted line in FIG. 7, is commonly called the filler slab 3.
The area called 3 was poured, and finally the filler slab 33 was poured.
Concrete facing for the entire slope is performed using the procedure of pouring lanes 1 to 0 in the area located above the main slab 34, that is, the area called the main slab 34.

The construction with the filler slab 33 is usually carried out by installing a hoisting device (not shown in the drawings) at the top 35 of the slope 31, and connecting a slip form, that is, a movable formwork to this hoisting device. Generally, a hoisting device provided on the top end 35 is operated to raise the slip form while pouring.

(Problems to be Solved by the Invention) In recent years, with advances in dam construction technology, the dams themselves are becoming larger.

As a result, when constructing concrete facings, especially filler slabs, on the slopes of such large dams using the conventional method described above, that is, by operating a hoisting device installed at the top to raise the slipform, the following results will occur: There are problems like this.

First, as the dam becomes larger, the length of the slope from the top to the bottom edge becomes longer. As a result, when a slipform hoisting device is installed at the top and the hoisting device is operated to raise the slipform and pour concrete, the position of the slipform and the hoisting device are very different. be in a distant position. Therefore, mutual communication is not smooth, which causes a decrease in work efficiency.

In particular, at the top, there are various types of construction machinery, such as a mixer truck for transporting concrete, a hopper for receiving concrete, and a feeder for supplying concrete from the hopper to the slip form. This poses a problem not only in terms of efficiency but also in terms of safety.

Furthermore, when moving the slip form laterally along the construction lanes ■ to ◎, in other words, to finish pouring the filler slab in one lane and then pour the filler slab in the next lane, move the slip form to the adjacent lane. In the case of lateral movement, conventional slipforms have problems in that the movement work is complicated, causing delays in the construction period and impairing work safety.

The present invention aims to solve the above-mentioned problems by improving the method of constructing concrete facings for larger dams, especially concrete facings for filler slabs, and the construction equipment therefor, that is, the slip form, as follows. be.

(Means for Solving the Problems) As a means for solving the above-mentioned problems, the present invention first provides a method for placing concrete in a filler slab surrounded by a toe slab and a main slab on a preset construction line. , set up a towing frame by driving anchors into the upper surface of the filler slab pouring area, as well as guide rollers for raising and lowering along the construction line and lateral movement for moving in a direction perpendicular to the construction line. A slip form equipped with rollers is set below the casting area of the filler slab, a hoisting device is provided on the set slip form and connected to the traction frame, and the slip form is moved upward using the hoisting device. Place concrete for the filler slab while
The slip form is lifted up from the concrete surface where it has been poured, and in the lifted state, the slip form is lowered to the toe slab side, moved laterally to the bottom of the filler slab pouring area on the next construction line, and then this filler slab is poured. The slip form is reconnected to the traction frame anchored to the upper surface of the installation area, and the above operations are repeated in order to cast the feeler slab of the concrete facing.

In other words, instead of connecting the slipform to a hoisting device installed at the top as in the past to raise and lower it, the hoisting device is connected to a traction frame anchored midway on the slope.
The aim is to improve the ability to raise and lower the slipform from a nearby location during concrete pouring.

When the concrete placement of the filler slab in one construction lane is completed, the slip form is lifted up from the concrete surface where concrete placement has just been completed, that is, it is separated and lowered, and the filler slab in the next construction lane is placed. The plan is to move the filler slab laterally under the construction area and pour the filler slab for the next construction lane.

In particular, when the slip form is descending and moving laterally, the lift-up mechanism built into the slip form and the grounding operation mechanism of the lateral movement rollers are used to make handling of the slip form efficient and rational. It is characterized by the following structure.

(Function) Since the present invention is configured as described above, it is possible to construct a filler slab in the concrete pouring area without having to handle the slip form using a hoisting device installed at the top of the slope as in the conventional method. It can be handled based on a tow frame set on a slope close to . Therefore, construction work setups, such as setting up and raising the slipform, lowering the slipform after pouring, and moving laterally to the next construction lane, can be carried out by workers on the slipform. , can be done safely and reliably at a nearby location.

(Example) Furthermore, based on the example shown in the drawings, the construction method and the concrete structure 1 and operation of the apparatus of the present invention will be explained. FIG. 1 shows an example of pouring a concrete slab for the filler slab 33a in construction lane (3) shown in FIG.

First, as shown in FIG. 1, a plurality of anchors are driven into the upper surface 31 of the filler slab 33a.
A traction frame 2, which is slightly wider than the span of the construction lane, is connected to this anchor cart.

Then, on both sides of the traction frame 2, rails 3 and 3 are laid parallel to the construction lane, and a slip form 4 is set horizontally on the laid rails 3 and 3.

Note that 4a is a work floor provided on this slip form 4. Winding devices 5 and 5 are provided on both sides of the slip form 4, and the winding wires 6 and 6 of the winding devices 5 and 5 are connected to both sides of the slip form 4 through pulleys 7 and 7 provided on the traction frame 2. to be locked.

That is, the slip form 4 is installed so that it can be raised and lowered by operating the hoisting devices 5 and 5 on the work floor 4a.

In that case, the position of the slip form 4 is set below the pouring area of the filler slab 33a to be poured as shown in FIG. Set it to the position above 32.

From this position, the hoisting device 5.5 is operated to raise the slip form 4 and concrete is poured. As described above, the hoisting devices 5, 5 are operated using the work floor 4a of the slip form 4.

FIG. 2 shows only the right half of the slip form 4 at the time when the slip form 4 is raised from the position shown in FIG. 1 and concrete for the filler slab 33a begins to be poured. FIG. 3 is a right side view of FIG. 2.

In this embodiment, the hoisting device 5 is a so-called chill fall jack consisting of a manual wire winding mechanism, but the efficiency of the work will be further improved if it is electrically operated. Further, the anchor cart and the index frame 2 are connected via a turnbuckle 8 as shown in FIGS. 2 and 3.

Next, as shown in Fig. 3, the rail 3 of the slip form 4 is laid on the slope 31 via a frame 9 having a level adjustment function, and the thickness of the poured concrete can be adjusted by adjusting the level. That's what I do.

Specifically, as shown in FIG. 3, the level is adjusted to match the pouring height of the toe slab 32 that has already been poured.

On both sides of the slip form 4, traveling devices for traveling on the rails 3, that is, guide rollers 10 are attached to the front and rear of the slip form 4, as shown in FIGS. 2 and 3, and furthermore, lateral movement rollers 11 are attached to both sides of the slip form 4.

When lowering the slip form 4 described above, a so-called lift-up mechanism for the slip form 4 is used to separate the slip form 4 from the finished concrete surface, as shown in FIGS. 4 and 5. It is attached to both sides of the slip form 4.

First, as shown in FIG.
A slide par 4a is pivotally supported on the slide par 2a, and the inside of the lower end portions 12 and 12a constitute the slip form 4.
A fixed shaft 13 is attached to the front end 4b and the rear end 4b of the
and 13 are connected.

On the other hand, a rotary shaft 14 is provided with female threaded holes 14a and 14a coaxially drilled in opposite directions, and connecting rods 15 and 15 are screwed into the female threaded holes 14a and 14a of this rotary shaft 14, respectively. 15 and 15 to the upper ends 12b and 12b of the supports ya12 and 12, as shown in FIG.
They are fixed together to form a kind of four-bar link mechanism.

That is, the rotating shirt 1 that constitutes this link mechanism
-14 clockwise or counterclockwise, the connecting ronds 15.15 protrude in the front-rear direction, and the left and right supporting legs 12.
The upper ends 12b, 12b of 12 are moved in the direction shown by the arrow in FIG.
It is designed to tilt using each as a fulcrum. As a result, the guide roller 10.10 is also tilted and displaced in the direction of the arrow shown in FIG.

That is, the guide roller is configured to bite under the slip form 4 and lift up the slip form 4.

The imaginary line in FIG. 6 shows a state in which the guide roller 10 bites under the slip form 4 and lifts up the slip form 4. Note that 16 is an operating handle attached to the rotating shaft 14.

Next, a description will be given of a grounding operation mechanism for the lateral movement roller 11 that performs a grounding operation when the slip form 4 is moved laterally. Similarly, as shown in FIGS. 4 and 5, both ends 11a and lla of the rotating shaft of the lateral movement roller 11 are connected to the lower ends of screw shafts 17 and 17 provided on the frame 4b of the slide form 4, respectively. However, by screwing up and down the screw shafts 17 and 17, respectively, the lateral movement roller 11 itself is raised and lowered, thereby performing a so-called grounding operation.

In other words, it is configured in a jack method. Of course, normally, this lateral movement roller 11 is not grounded, and is operated to touch the ground only in the case of lateral movement work.

Since the embodiment of the present invention is constructed as described above, first, as a method of constructing the filler slab, as shown in FIG.
At the same time, a worker manually operates the hoisting devices 5, 5 attached to the slip form 4 on the work floor 4a to raise it up, and concrete of a predetermined filler slab 33a is poured. .

Once the concrete placement of this filler slab is completed,
A lift-up mechanism assembled to the slip form 4 itself is operated to lift up the slip form 4 from the freshly poured concrete surface and separate it. That is, the rotating shaft 14 is operated using the operating handle 16, the guide roller 10.10 is wedged under the slip form 4, and the slip form 4 is lifted up.

Next, the slip form 4 is lowered by operating the hoisting devices 5,5. When it is lowered, the lateral movement roller 1
1 to the ground by operating the grounding operation mechanism. That is, the screw shaft 17.17 is operated to bring the lateral movement roller 11 into contact with the ground.

In this state, the slip form itself is moved to the next construction lane, the left lane in Figure 1, which is the filler slab pouring area, and the above steps are repeated in order to pour concrete for the filler slab. .

(Effects of the Invention) As explained above, when concrete is poured into a filler slab, the slip form itself is installed in the middle of the slope, instead of using the elevating operation device installed at the top of the slope as in the past. Because it can be lifted and lowered using a traction frame attached to the slipform and a hoisting device attached to the slipform itself, the positional relationship of machine operations during construction work can be brought closer together, resulting in efficient, safe, and efficient construction work.
It is possible to reliably carry out concrete placement work for filler slabs.

Furthermore, the lift-up mechanism that separates the slip form itself from the concrete placement surface and the grounding operation mechanism for the lateral movement rollers are attached to the slip form, which plays a major role in this work, so compared to conventional slip forms, The slip form itself is extremely easy to handle and functional.

In addition, when the slip form is moved horizontally from one construction lane to another, if the concrete placement in the construction lane next to it is completed and hardened, there is no need to force the rails to be laid, which simplifies the work setup. This has the effect of shortening the construction period as well as reducing equipment costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the setting state of a slip form set for construction of a filler slab, and FIG. 2 is a plan view showing the right half of the slip form. Figure 3 is the right side view of Figure 2,
The figure is a plan view showing the configuration of the slipform lift-up mechanism attached to the slipform and the lateral movement roller grounding operation mechanism, Fig. 5 is a right side view, and Fig. 6 is a schematic diagram showing the operation of the lift-up mechanism. FIG. 7 is a plan view of the dam slope showing an example of dividing the construction lane when concrete facing is performed. ■~O... Construction lane 31... Slope 32... Toe slab 33
...Filler slab 34...Main slab 35.
・・Top 1・Anchor 2・Index frame 3・
・Rail 4・Slip form 5・
... Winding device 6... Winding wire 7...
・Pulley 8...Turnbuckle 9...
Frame 10...Guide roller -11
. . . Lateral movement roller 12 . Figure 2 Figure 3 Figure 4 Figure 5 Figure 6, 5 ]υ IJ 4 (1

Claims (2)

[Claims] (1) When pouring concrete for the filler slab enclosed between the toe slab and the main slab on a preset construction line, anchors are driven into the upper surface of the filler slab pouring area to set up a traction frame. At the same time, a slip form is set below the casting area of the filler slab, a hoisting device is attached to the set slip form and connected to the traction frame, and the slip form is moved upward using the hoisting device while filling the filler slab. Placing slab concrete,
When the concrete placement of the filler slab is completed, the slipform is lifted up from the concrete surface where it was placed, lowered, and moved laterally to the area below the filler slab placement area of the next construction line, and then this filler slab is placed. A filler slab construction method for dam concrete facing, characterized in that the slip form is reconnected to a traction frame anchored to the upper surface of the construction area, and the above operations are repeated in order to cast a filler slab for concrete facing. (2) Dam concrete facing construction characterized by incorporating on both sides of the slip form a slip form lift-up mechanism for separating the slip form from the pouring surface and a grounding operation mechanism for moving the lateral movement roller up and down. Device.