JPH0314966B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a formwork used when pouring concrete onto a slope, and more specifically, the present invention relates to a formwork used when pouring concrete onto a slope, and more specifically, rope anchors are planted on the slope at a predetermined pitch, and Concrete formwork for a slope surface, characterized in that a wire rope with a plurality of supporting metal fittings inserted between the rope anchors is stretched, and unit formwork is laid between the side frames while being supported by the supporting metal fittings. Regarding.

(Technical background) Conventionally, when pouring concrete on a slope, multiple anchor bolts are planted across the entire slope, and sheet materials are attached to the anchor bolts via tie bars, etc. It was common practice to place concrete within the space formwork formed by the timber.

However, in order to construct these formworks, anchor bolts must be planted at required intervals over the entire slope, and the anchor bolts themselves are subject to excessive lateral pressure during concrete pouring. Accidents such as loosening or falling off occurred, which delayed the construction period and increased construction costs.

Therefore, the inventors planted rope anchors at predetermined intervals on the slope and inserted supporting metal fittings between the rope anchors in the flexible form construction method (Japanese Patent Application Laid-open No. 60-85120) that they had previously filed. We devised a flexible formwork construction method that applies the so-called suspension bridge theory, in which the lateral pressure of poured concrete applied to the flexible sheet is dispersed by the wire rope via the supporting metal fittings by spanning the wire rope.

This flexible formwork construction method can form a concrete layer with a predetermined slope more uniformly and accurately than conventional formwork, but the flexible sheet swells and the poured concrete hardens, resulting in the surface of the poured concrete becoming wavy. It had drawbacks such as:

(Purpose) Therefore, the inventors thought about it again and decided to create a formwork that would not cause the surface of the poured concrete to be corrugated, that is, to lay a unit formwork made of long materials between the side frames while being supported by supporting metal fittings. This guide provides concrete formwork for slopes that can sufficiently resist the lateral pressure of poured concrete and ensure the surface smoothness of poured concrete.

(Summary of the Invention and Examples) Hereinafter, the concrete formwork for slopes of the present invention will be explained in detail based on the drawings.

Figure 1 shows a concrete pile 103 between the head 101 and the tail 102 of a slope 100 of a sandy ground.
FIG. 2 is a schematic side view showing a state in which a mold is cast and a formwork according to the present invention is constructed on the upper surface thereof.

That is, a root cut is made from the head 101 to the foot 102 using an excavator such as a box hoe, and sacrificial concrete 103 is directly poured into the cut.

This waste concrete 103 is formed in a plurality of strips along the inclination direction of the slope 100.

In such a slope 100, support anchor bolts 104, 104... are planted in the sacrificial concrete 103, 103 cast at both ends at predetermined intervals in the slope direction, and the support anchor bolts 104, 104...
A pair of side frames 105, 105 are erected along.
And between the side frames 105 and 105, the unit forms 1, 1
... and unit formwork 1, 1 laid on both ends
... are fixed with nuts via support anchor bolts 104, 104....

That is, on the slope 100 there are side frames 1 at both ends.
A mold space O is formed by the unit molds 05, 105 and the unit molds 1, 1, .

FIG. 2 is a plan view of the unit formwork 1. This unit formwork 1 is formed by forming elongated materials 11, 11, 11, 11, such as so-called angle steel materials, into a substantially rectangular shape,
A middle crosspiece 14 having a predetermined gap 13 is provided approximately in the horizontal center with two elongated members 12, 12 facing each other with their back faces.

In the unit formwork 1 having the above shape, the weir plate surface 15 is made of expanded metal 2 as a porous surface material.
is stretched, and a fiber material 3 is attached to the outer surface of the expanded metal 2.

As shown in FIG. 3, which is a cross-sectional view taken along line A-A in FIG. The fiber material 3 is entirely covered on the outer surface side of the expanded metal 2.

This long material 11, 11, formed into a substantially rectangular shape,
11, 11 and the expanded metal 2 are fixed together by spot welding or the like.

Furthermore, the fibrous material 3 is attached to the elongated materials 11, 11.
It can be screwed directly to... or it can be attached to a hook (not shown) provided on the expanded metal 2.

As the porous surface material, in addition to the expanded metal described above, a perforated foam made of steel or resin, a so-called porous foam, etc. can be used.

FIG. 4 shows unit formworks 1, 1... having the above configuration.
FIG. 2 is a partially omitted plan view showing a state in which it is laid on a slope 100 of .

In other words, a plurality of unit formworks 1, 1... are disposed of on side frames 10 erected on concrete 103, 103.
5,105, and the side frame 10
The unit forms 1, 1... laid on the support anchor bolts 104, 105, as described above in FIG.
It is fixed by 104.

The unit formworks 1, 1... adjacent to the unit formworks 1, 1... in the lateral direction of the slope 100 are installed on the side frames 105, 105 by bolts or clamps (not shown). 1, 1... are fixed in a continuous state.

By the above-mentioned construction method, the unit formworks 1, 1... are laid across the spaces between the sacrificial concrete 103, 103 at both ends.

On the other hand, in order to lay each of the unit formworks 1, 1, . The supporting metal fitting 4 is a so-called tightening bolt that also serves as a separator, and includes a form tie 41, a cone 42, a separator 43, and a separator 4.
It is formed from a ring 44 provided at the lower end of 3.

The supporting metal fitting 4 includes a form tie 41 and a cone 42.
The unit forms 1, 1... are held in a clamped state.

That is, a form tie 41 is placed between the elongated members 11, 11, . . . between adjacent unit formworks 1, 1, .

If necessary, a form tie 41 can be inserted into the gap 13 of the middle crosspiece 14 provided approximately at the center of the unit formwork 1, and held by the cone 42, washer 5, and nut N in the same manner as described above.

On the other hand, the separator 43 can be selected to have an appropriate length in consideration of the length corresponding to the predetermined thickness of the concrete to be placed on the slope 100 and the bending length of the wire rope, which will be described later.

A ring 44 is formed at the lower end of the separator 43, and a wire rope is inserted into the ring 44.

As shown in FIG. 6, which is a view taken along line B--B in FIG. 4, the unit forms 1, 1, . . . are held by form ties 41 at the upper part of the supporting metal fitting 4. Further, in the lower part, the wire ropes 6, 6 stretched between the rope anchors 61, 61 are inserted into the ring 44 and supported.

As a result, the unit formworks 1, 1, . . . are supported by the loop-shaped wire ropes 6, 6, . That is, side frames 105, 105 are erected at both ends of the slope 100, and the unit forms 1, 1... are anchored to the upper surface thereof via wire ropes 6 and supporting metal fittings 4. Formwork space O formed above
Even if concrete is poured inside, the unit formwork 1, 1...
never swells.

(Effects) Therefore, the poured concrete is formed to a predetermined thickness over the entire slope, and since each unit form itself does not swell, the poured surface can be finished smoothly. Furthermore, the weir plate surface of the unit formwork is made of a porous surface material such as expanded metal, and the outer surface of the weir plate is coated with a fiber material, so that air bubbles contained in poured concrete and hardening surplus water are absorbed by the fiber material. Capillary action facilitates permeation through the porous surface material to the outside of the formwork. Furthermore, air avatars do not occur on the surface of the poured concrete, and the initial strength and abrasion resistance are improved.

Therefore, early demolding of the formwork becomes possible, and the number of reuses of the unit formwork also increases.

Furthermore, the fiber material itself acts as a heat insulating material in the winter, and has a remarkable curing effect, such as being effective as a heat insulating material in the summer.

Particularly in the construction of slopes in dam construction, etc., cracks and the like due to temperature differences in mountainous areas can be easily prevented.

As described above, the formwork of the present invention can ensure ease of construction and aesthetic appearance of the pouring surface.

[Brief explanation of the drawing]

Figure 1 is a schematic side view explaining the concrete formwork for the slope, Figure 2 is a plan view of the unit formwork, and Figure 3
The figure is a sectional view taken along the line A-A in Fig. 2.
The figure is a partially omitted plan view showing the state in which the unit formwork is laid on a slope, Fig. 5 is a partially omitted view showing the supporting metal fittings that hold the formwork, and Fig. 6 is the same as in Fig. 4. It is a BB line arrow view. 1, 1... unit formwork, 11, 11... long material,
2... Expanded metal, 3... Textile material, 4,
4...Supporting metal fitting, 41...Form tie, 42...
... Cone, 43 ... Separator, 44 ... Ring, 6 ... Wire rope, 100 ... Slope, 1
03,103...Saved concrete, 104,10
4... Support anchor bolt, 105, 105...
Side frame.

Claims (1)

[Scope of Claims] 1. Rope anchors are planted on a slope at a predetermined pitch, a wire rope with a plurality of supporting metal fittings inserted between the rope anchors is stretched, and the wire rope is supported by the supporting metal fittings. Concrete formwork on a slope with unit formwork laid between the side frames. 2. The unit formwork is formed by forming a long material into a substantially rectangular shape,
2. The concrete formwork for a slope according to claim 1, wherein the weir plate surface is formed of a porous surface material, and a fiber material is adhered to the outer surface of the porous surface material.