JPH0470449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for pouring concrete blocks for slope protection on the exposed part of the slope of rock bolts fixed in the slope, and a formwork thereof. However, it is necessary to install on-site bearing plates for slope protection, which can prevent the tips of the lock bolts and tightening nuts that fix the concrete blocks mentioned above from corroding, and can stably protect slopes over a long period of time. The objective is to provide a method and its formwork.

Hereinafter, embodiments of the present invention will be described with reference to the planes.

In FIG. 1, reference numeral 1 denotes a slope, on which lock bolts 2 are driven into appropriate positions. Second
As is clear from the figure, the tip of the lock bolt 2 is exposed on the slope, and a steel plate 3 is attached to the tip.
is fitted and inserted, and a tightening bolt 5 is attached to the tip of it via a connecting sleeve 4. Incidentally, the connecting sleeve 4 and the tightening bolt 5 may be constructed integrally.

Reference numeral 6 denotes a formwork, which has various shapes such as a truncated pyramid shape as shown in FIG. 3 and a truncated cone shape as shown in FIG. 4. The size of the formwork 6 is changed depending on the situation of the slope. If the surface layer of the slope is soil, a relatively large formwork 6 is required from the design to resist earth pressure and to protect the surface. In the case of a good design, a relatively small one can be used to protect the bolt.

As is clear from FIG. 2, a protrusion 6b is bored inwardly at the center of the upper surface 6a of the formwork 6, and a hole 6c is protruded from the center of the protrusion 6b. A connecting sleeve 4 and a tightening bolt 5 attached to the tip of the locking bolt 2 are fitted into the hole 6c, and the protrusion 6b is held between the iron plate 3 and the holding plate 7 and tightened. The formwork 6 is tightened and connected to the lock bolt 2 by a nut 8.

As is clear from FIGS. 1 and 3, a concrete outflow prevention piece 9 consisting of a large number of plate pieces is arranged on the side surface 6d of the formwork 6, and between it and the formwork reinforcing frame 10. It is designed to be clamped and fixed by the inserted wedge 11.

Therefore, by slidingly adjusting each outflow prevention piece 9 according to the size of the gap created between the surface of the slope 1 and the side surface 6d of the formwork 6, the gap is closed and concrete leakage is prevented. I'm starting to do that.

Concrete is poured into the formwork 6 set as described above using a concrete pump or the like.
Once the concrete has hardened, remove the wedge 11, remove the formwork reinforcing frame 10 and the outflow prevention piece 9, loosen the tightening bolts 5 shown in FIG. 2, remove the holding plate 7, and demold the formwork 6. do. continue,
Remove the connecting sleeve 4 from the lock bolt 2,
A nut 12 is tightened to the tip of the lock bolt 2 as shown in FIG. 5, and the concrete block C is firmly fixed. Demolded formwork 6
Fill the recess C' of the concrete block C formed by the protrusion 6b with concrete or mortar, and connect the tip of the lock bolt 2 and the nut 12.
It is designed to prevent corrosion.

Incidentally, the demolded formwork 6, outflow prevention piece 9, etc. are reused for forming the next concrete block.

6 to 11 show various reference examples of outflow prevention means in place of the outflow prevention piece 9. In FIG. attached to the side surface 6d of the formwork 6, and attached to the hem 13a of the sheet 13.
is spread outward along the surface of the slope 1, and granular materials G such as sand and gravel are packed inside to prevent the poured concrete slag from leaking outside.

FIG. 7 shows the hem 13a of the sheet 13 in the formwork 6.
Another reference example is shown in which the side surface portion 6d is bent inward to close the gap. In the case of this reference example, the above-mentioned granules G are not necessary.

In FIGS. 8 and 9, bolt mounting pieces 10a are appropriately arranged inside the formwork reinforcing frame 10, and the bolts 14 screwed thereon press down the sand S packed in the gap via the push plate 15. Another reference example is shown below.

In FIG. 10, a flange 6e having a semicircular cross section is formed facing downward on the outside of the side surface 6d of the formwork 6, and the tube 16 is held within the flange 6e and elastically pressed against the surface of the slope 1. Another reference example is shown in which the gap is closed.

In FIG. 11, a frame 17 is provided at a predetermined interval on the outside of the side surface 6d of the formwork 6, a sheet 18 is stretched between the frame 17 and the side surface 6d, and sand S is filled therein. Another reference example is shown in which the gap is closed by

With the construction method and formwork of the present invention, it is possible to prevent the tips of lock bolts and tightening nuts that secure concrete blocks from corroding, so that slopes can be stabilized for a long time by using concrete blocks for slope protection. protected.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the implementation status of the concrete block casting method of the present invention, FIG. 2 is a cross-sectional view showing an enlarged connection between the lock bolt and the formwork,
Fig. 3 is a perspective view of a truncated pyramid-shaped formwork with a spill prevention piece attached, Fig. 4 is a perspective view of a truncated cone-shaped formwork, and Fig. 5 shows the lock bolt after removing the formwork. Cross-sectional view of the connecting part of concrete blocks, No. 6
Figures 1 to 11 are explanatory diagrams of main parts showing reference examples of outflow prevention means. 1...Slope, 2...Lock bolt, 3...Iron plate, 4...Connection sleeve, 5...Tightening bolt, 6
...Formwork, 6a...Top surface part, 6b...Protrusion part, 6
c...hole, 6d...side part, 6e...tsuba, 7...
Holding plate, 8... Tightening nut, 9... Outflow prevention piece,
DESCRIPTION OF SYMBOLS 10... Form reinforcement frame, 10a... Bolt attachment piece, 11... Wedge, 12... Nut, 13... Sheet, 13a... Hem part, 14... Bolt, 15...
...push plate, 16... tube, C... concrete block, C'... recess, G... granular material, S...
sand.

Claims (1)

[Scope of Claims] 1. In a construction method in which a concrete block for slope protection is cast on-site at the exposed part of a rock bolt fixed in a slope, a tightening bolt is attached to the tip of the rock bolt, and the upper and side parts are The tip of the locking bolt and the tightening bolt are inserted into the hole drilled in the upper surface of the truncated cone-shaped formwork, and the formwork is connected to the locking bolt, and then the formwork is connected to the locking bolt. Concrete is poured into a formwork, and after the concrete has hardened, the formwork is demolded and the tightening bolts are removed. A method for on-site casting of a concrete block for slope protection, characterized in that the concave part of the concrete block is filled with concrete or mortar to close the tip of the lock bolt exposed in the concave part and the nut tightened thereto. 2. In the formwork for casting concrete blocks for slope protection on-site at the exposed parts of lock bolts fixed in the slope, the formwork is constructed in the shape of a truncated cone by the top and side parts, and the top part faces inward. A formwork for a concrete block for slope protection, characterized in that a protruding part is provided in a protruding manner, and a hole is formed in the protruding part through which a tightening bolt connecting the tip of the locking bolt and the formwork is inserted. .