JPS6261734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork method used when pouring concrete onto a slope, and more specifically, the present invention relates to a formwork method used when pouring concrete onto a slope, and more specifically, rope anchors are planted at a predetermined pitch in the direction of slope. , a wire rope with a fastening fitting inserted between adjacent rope anchors is erected and fixed, a nesting frame is built near the outermost rope anchor, a flexible sheet is covered over this double nesting frame, and a wire rope is fixed with a fastening fitting inserted between adjacent rope anchors. The flexible sheet is held in place by supporting anchor bolts via clamping fittings and wire ropes, and a foundation is placed at the foot of the slope, and the lower end of the flexible sheet is pressed onto the top surface of the foundation. This relates to a flexible formwork construction method characterized by pouring concrete.

Conventionally, when pouring concrete onto a slope, multiple anchor bolts are planted at predetermined intervals throughout the slope, and a flexible sheet is attached to the anchors via tie bars. Concrete was being poured inside the frame.

In these formwork construction methods, many anchor bolts must be planted across the entire slope, and the anchor bolts are hard enough to prevent them from falling out due to the lateral pressure that the flexible sheet receives during concrete pouring. It had to be fixed to the ground in a way that gave it strength. As a result, the work of planting anchor bolts on the slope delays the construction period and increases costs.

Furthermore, depending on the slope of the slope and the geological condition of the ground, the work of installing anchor bolts is difficult, and moreover, an uneven layer of poured concrete is often formed on the slope.

In order to solve the above-mentioned problems, the present invention has been developed by planting rope anchors at predetermined intervals on the slope, and in addition, wire ropes with fastening fittings inserted between the rope anchors are stretched so that the flexible sheet can receive the concrete. The present invention provides a formwork construction method that disperses concrete placement stress using the so-called suspension bridge stress theory, in which lateral pressure is dispersed by wire ropes via fastening fittings.

Hereinafter, the flexible formwork construction method of the present invention will be explained in detail based on the drawings.

There are usually two types of ground: bedrock ground and sandy ground.
The former allows a rope anchor to be planted directly into the rock, but the latter is weak and cannot be firmly fixed even if a rope anchor is planted.

Therefore, a method is used in which sacrificial concrete is placed on the top of the soil pile and rope anchors are planted in this sacrificial concrete.

The present invention will be described below as an example in which concrete is placed on the slope of a sandy ground and a formwork is constructed on the top surface of the concrete.

FIG. 1 is a side view showing a state in which a sacrificial concrete zone 13 is provided extending from the head 11 of the earth 1 to the foot 12 of the slope.

First, root cutting is performed from the head 11 to the foot 12 of the ground 1 using a box hoe or the like, and sacrificial concrete is poured directly into the root cutting without using formwork.

In pouring this waste concrete, sufficient compaction is performed using a rod-shaped vibrator, etc., and rope anchors 2 are planted at predetermined intervals.
Furthermore, the top is leveled in order to build a living frame, which will be described later.

Further, a foot end foundation 14 is provided at the foot end 12, and anchor bolts are also planted at predetermined intervals on this foot foot foundation 14.

FIG. 2 is a schematic diagram of the slope in FIG. 1 viewed from the front.

That is, sacrificial concrete bands 13, 13... are cast from the head of the slope 11 to the foot of the slope 12, and moreover, a plurality of sacrificial concrete bands 13, 13... are placed between the outermost sacrificial concrete bands 13a and 13b. It is something that

In Fig. 2, there is one concrete zone 1 between the outermost concrete zones 13a and 13b.
This shows the case where No. 3 is poured.

In addition, support anchor bolts 3, 3, etc. for holding flexible sheets, which will be described later, are installed in the vicinity of rope anchors 2, 2, etc. installed in the outermost sacrificial concrete zones 13a and 13b, respectively.

On the other hand, at the slope end 12, a substantially trapezoidal slope foot foundation 14 is provided between the outermost concrete strips 13a and 13b.

Next, wire ropes 4, 4 are placed between the rope anchors 2, 2... planted in one waste concrete zone 13 and the rope anchors 2, 2... planted in another waste concrete zone 13 adjacent thereto. ...is set up.

FIG. 3 is a schematic explanatory diagram showing this tensioned state.

This wire rope 4 has a plurality of fastening fittings 5, 5, .

FIG. 4 is an explanatory diagram showing the planar state of the wire rope 4. That is, the wire rope 4 has both ends formed into a loop by clips, sockets, and compression stops. This loop 41, 42
The head of the rope anchor 2 is inserted into the head of the rope anchor 2, and a washer is fitted from above and fixed via a nut.

FIG. 5 is an exploded explanatory view of the fastening fitting 5 attached to the wire rope 4.

This fastening fitting 5 includes a ring 51 through which the wire rope 4 is inserted, a separator 52 for adjusting the distance between the flexible sheet and the ground, and the separator 5.
2 and the eye nut 53 that screws the form tie 54
It further comprises a clamping tool 55 and a nut 56 for crimping the butter material.

To attach this fastening fitting 5 to the wire rope 4, first perform the above-described terminal treatment on one end of the wire rope to form the loop 41, insert a predetermined number of rings 51 from the other end, and then close the other end. The terminal processing is also performed in a loop 42.

Incidentally, in order to counter the stress during pouring, reinforcing bars may be used in place of the wire rope 4 near the top stage, which serves as the inlet for pouring concrete.

As described above, after the wire rope 4 is stretched, the living frames 6, 6 are erected in the outermost concrete zones 13a and 13b. The eye nuts 53, 53 are then covered with the flexible sheet 7 from above and screwed onto the separators 52, 52... of the fastening fittings 5, 5...
Peek at the top of the flexible sheet 7,
Eye nuts 53, 53... and form ties 54, 5
4. Screw together.

Through these form ties 54, 54...
For example, attach butterfly materials 8, 8, . . . .

That is, as shown in FIG. 6, in the waste concrete zone 13a, a living frame 6 is built between the rope anchor 2 and the support anchor bolt 3 along the slope direction of the slope, and a flexible sheet 7 is placed on this living frame 6. be coated with. And this flexible sheet 7
The form ties 54, 53... of the fastening fittings 5, 5... are exposed on the upper surface, respectively.
Attach 54....

After that, as shown in Fig. 7, living frames 6,
6, the butterfly materials 8, 8... are installed between the two ends, and the butterfly materials 8, 8... are fixed at both ends with support anchor bolts 3, 3, and the mounting brackets 5 of the form ties 54 are installed.
5 and the wire ropes 4, 4 through the nut 56.
are suspended from the butter materials 8, 8...

FIG. 8 shows the built-in state of FIGS. 6 and 7 as a side view.

That is, the living frames 6, 6 are covered with a flexible sheet 7, and on the upper surface of the flexible sheet 7, butter materials 8, 8... are attached at both ends with supporting anchor bolts 3, 3.
It is fixed and constructed by...

Further, in the intermediate portion, wire ropes 4, 4... and butterfly materials 8, 8... are suspended via clamping fittings 5, 5....

FIG. 9 shows the attachment 31 of the support anchor bolt 3.
FIG. 2 is an enlarged view illustrating a state in which the flexible sheet 7 is attached to the housing frame 6 via the and butter material 8.

The living frame 6 is formed assuming the surface shape of a flexible sheet formed after concrete is poured.

That is, the portion where the butterfly material 8 is attached by the support anchor bolt 3 is a recessed portion, and the other portion is formed into a somewhat bulged shape.

Further, the flexible sheet 7 is placed over the outer surface of the living frame 6 with the side end hanging down, and a thin batten (not shown) is brought into contact with the upper end surface of the living frame 6 and fixed with nails.

In the head 11, the amphibious frames 6, 6 and the flexible sheet 7 are not sealed, but are formed as an opening for pouring concrete.

On the other hand, at Hojiri Foundation 14, flexible sheet 7
The lower end of the anchor bolt 15 on the bottom foundation 14,
15..., wrap the end 71 of the flexible sheet 7 into the pipe material 16, and wrap the lower end into the compressed material 1.
7.

A drain pipe 9 is provided to drain water from the ground 1, and this drain pipe 9 is shown in Figure 11a.
As shown, it is composed of a base tube 91 and a mounting plate 92. An insertion rod 93 is attached to the back surface of the mounting plate 92 at an angle equal to the approximate normal slope.

A cloth tape or the like is wrapped around the outer periphery of the insertion rod 93 so that poured concrete does not enter into the base pipe 91 when the insertion rod 93 is inserted into the base pipe 91.

Furthermore, in order to attach the drain pipe 9 to the inner surface of the flexible sheet 7, a mounting plate 92 is fixed to a required location on the inner surface of the flexible sheet 7, as shown in FIG. 11b. Adhesive, nailing, etc. are used as the fixing means.

Next, the insertion rod 93 is movably inserted into the tip of the base tube 91, and the rear end 94 of the base tube 91 is inserted into crushed stone 95 embedded in the earth 1.

At this time, even if the mounting plate 92 is moved in the front-back direction due to the expansion of the flexible sheet 7, the insertion rod 9
3, the rear end 94 of the base pipe 91 is fully inserted into the crushed stone 95 so that the base pipe 91 can be smoothly followed without falling out, and guide reinforcing bars 96 are arranged on both sides of the drain pipe 9. ing.

As a result, even if the concrete 100 is placed inside the flexible sheet 7 and the flexible sheet 7 swells, the drain pipe 9 moves through the buried part of the crushed stone 95 and swells outward as shown in FIG. 11c. amount is withdrawn.

Therefore, when the flexible sheet 7 is removed after the concrete 100 has hardened, the mounting plate 92 is also removed together with the base pipe 9 as shown in FIG. 11d.
The drainage hole 97 communicating with the concrete 100
formed on the surface of

Concrete is poured into the legal formwork through the opening of the head 11 of the legal formwork constructed as described above and placed. In this concrete pouring, the concrete is poured at a rate of 6 m ³ /hr, and a rod-shaped vibrator is used as appropriate to ensure sufficient compaction.

Further, during concrete pouring, the above-mentioned pouring speed may be changed as appropriate to prevent abnormal swelling of the flexible sheet 7 due to concrete pouring stress.

After concrete is poured into the formwork, a separate curing sheet is placed over the opening of the temple to prevent it from being exposed to direct sunlight, wind, etc.

Further, by directly spraying water on the outer surface of the flexible sheet 7 and keeping the flexible sheet 7 itself in a moist state, a sufficient curing effect can be obtained.

After the poured concrete has hardened, the butterfly materials 8, 8... are released from the fixtures 31, 31... of the support anchor bolts 3, 3..., and the flexible sheet 7
When the housing frames 6, 6 are removed from the mold, concrete serving as a frame is formed on the surface of the ground.

As described above, by using the formwork method according to the present invention, anchor planting on the slope can be carried out intensively using rope anchors and wire ropes, making concrete placement extremely easy. At the same time, the cost of formwork construction can be significantly reduced.

In addition, if a highly breathable material such as cloth is used for the flexible sheet, the vibration of the rod vibrator during pouring will cause air bubbles in the concrete to pass through the flexible sheet and be expelled to the outside, resulting in concrete without air avatars. A surface is obtained. Similarly, surplus water from concrete hardening is discharged to the outside through the flexible sheet, thereby shortening the curing period and increasing the initial strength of the concrete.

Therefore, the flexible formwork construction method of the present invention exhibits an unprecedentedly high effect as a formwork used for slope pouring.

[Brief explanation of the drawing]

Figure 1 is a side view showing the state in which the sacrificial concrete belt and foot foundation have been cast into the ground, Figure 2 is a front view of Figure 1, and Figure 3 is a wire rope stretched between rope anchors. Figure 4 is a plan view of the wire rope, Figure 5 is an exploded view of the fastening fittings, and Figure 6 is a living frame built in the outermost concrete zone. 6 and an enlarged explanatory diagram of the state in which a flexible sheet is covered on its top surface,
Fig. 7 is an overall schematic diagram of the flexible formwork according to the present invention, Fig. 8 is a schematic diagram of the flexible formwork of Fig. 7 viewed from the side, and Fig. 9 is a state in which the support anchor bolts are attached. Enlarged explanatory diagram showing 1st
FIG. 0 is an explanatory diagram of a state in which a flexible sheet is attached to a slope foot foundation, and FIGS. 11 a, b, c, and d are schematic diagrams illustrating a state in which a drain pipe is attached. 1... Earth, 13, 13... Waste concrete zone, 1
4...Fashion base, 2,2...Rope anchor, 3,3
... Support anchor bolt, 4, 4... Wire rope, 5, 5... Tightening fittings, 6, 6... Living frame, 7... Flexible sheet, 8, 8... Bata material.

Claims (1)

[Claims] 1. Rope anchors are planted on the slope at specified pitches, wire ropes with multiple fastening fittings inserted between adjacent rope anchors are stretched and fixed, and placed in a habitat built near the outermost rope anchor. Cover the flexible sheet, hold the flexible sheet with a fastener and support anchor bolt through a butterfly material, and press the lower end of the flexible sheet on the upper surface of the footing foundation with a pressing material. A flexible formwork construction method characterized by pouring concrete into a legal formwork consisting of a frame, a footing, and a flexible sheet.