JPH0348972B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for burying anchor bolts for fixing stone cladding, and particularly to a method that can improve the burying accuracy of anchor bolts.

Traditionally, flat stones have been attached to the outside of a concrete frame as the exterior walls of architectural structures, and wet construction methods involve temporarily fixing the stones to the frame and pouring mortar between them. In recent years, anchor bolts have been buried within the concrete structure, and the engraved heads of the screws have been placed on the surface of the structure, as there have been problems with earthquake resistance, efflorescence, where the lime content in the mortar oozes out, and poor workability. A so-called dry stone cladding method has been developed in which the stones are attached to the building frame using L-shaped fittings and the like.

In this dry masonry construction method, the installation accuracy of the anchor bolts buried within the building frame is an important point.

In other words, if the position, levelness, and amount of protrusion from the structure between the anchor bolts are not performed with high precision, this will have to be corrected, which will not only reduce construction efficiency but also pose a problem in installation strength. In particular, higher precision is required for the vertical spacing and horizontality of anchor bolts that bear the weight of the stone.

By the way, the conventional method of burying anchor bolts is to drill through holes in advance in the formwork for concrete pouring, and then pour concrete after the holes are erected. This was done by pushing the anchor bolts one by one into the through holes in the hardened state.

However, this method is inefficient, and the anchor bolts cannot be installed after the poured concrete for forming the frame has completely hardened. On the other hand, if the anchor bolts are installed before the concrete has hardened, the anchor bolts will shift due to their own weight. It will drop and you will not be able to maintain levelness.

Therefore, it is extremely difficult to judge the timing to insert the anchor bolt into the hole and install it.Furthermore, the installation into the poured concrete is done manually, so there are variations, and it is difficult to bury the anchor bolt within the desired precision. was difficult.

For this reason, the vertical and horizontal inclinations of the buried anchor bolts had to be corrected, which deteriorated the construction condition and became an obstacle to shortening the construction period and reducing costs.

This invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a method for burying anchor bolts for fixing stone cladding, which can bury anchor bolts for fixing stone materials with high precision. It's there to do.

In order to achieve the above object, the present invention provides a method for embedding anchor bolts for fixing masonry materials in a concrete structure, in which through-holes are drilled at predetermined intervals in a formwork for forming the structure, and
A frame material having an insertion hole formed in a position corresponding to the through hole is fixed to this formwork, and the head of the anchor bolt is inserted and screwed into the insertion hole and the through hole, and then the The method is characterized in that a formwork is set, concrete is poured, and after the concrete has hardened, the anchor bolts are unscrewed, the formwork is removed, and the anchor bolts are buried in the building frame.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

1 to 4 show an embodiment of a method for embedding an anchor bolt for fixing stone cladding according to the present invention.

FIG. 1 shows a state in which formwork 22 is placed to be erected to form a frame 20 by pouring concrete.

This formwork 22 is formed into an elongated flat plate, and a pair of frame members 24 and 26 are attached to the axis of the formwork along the longitudinal direction from both sides so as to sandwich the formwork 22. It is fixed with bolt nuts 28, 28...

In the formwork 22, through holes 30, 30... are bored at a predetermined interval in the vertical direction, the diameter of which is slightly larger than the diameter of an anchor bolt, which will be described later, and the interval in the vertical direction is It is set in relation to the stone material attached to 20.

Of the frame materials 24 and 26, the frame material 24 located on the outer surface of the formwork 22 has a U-shaped cross section with one side and upper and lower ends open, and the inner frame material 26 has one side open. The frame members 2 are formed into a dish shape with openings, and are arranged so that the respective openings face each other.
4 and 26 have insertion holes 32 and 34 formed in positions corresponding to the through holes 30 drilled in the formwork 22, respectively. Of the insertion holes 32 and 34, those of the inner frame material 26 are inserted into the outer (frame 20 to be formed)
It is tapered so that its diameter increases toward the side.

On the other hand, as shown in FIG. 2, the anchor bolt 36 for fixing stone cladding has one end bent into a substantially L-shape, and a screw is provided around the head 36a at the other end.

Approximately 2/3 of the length of the L-shaped bent portion 36b and central portion 36c of this anchor bolt 36 is buried in the body 20, and approximately 1/3 of the length of the central portion 36c is buried within the body 20.
An umbrella-shaped stopper 38 is fixed at a location corresponding to the amount of this projection, and this stopper 38 is formed continuously with the sloped portion 38a that fits into the insertion hole 34. flange portion 38b.

The anchor bolt 36 is attached to the formwork 22 by inserting its head 36a through the insertion hole 34, the through hole 30, and the insertion hole 32 from the inner frame material 26 side, and screwing the nut 40 into the head 36a. Fixed.

The formwork 22 to which the anchor bolts 36 are fixed in this way is erected by connecting the required number of forms horizontally as shown in FIG. 1, and concrete is poured.
After curing, the nut 40 is unscrewed and the formwork 22 is removed.
When removed, the anchor bolts 36 are buried within the frame 20.

In this case, the inner frame material 26 and the formwork 2
2, the frame material 26 is formed into a dish shape, and its insertion hole 34 is closed by the inclined part 38a and flange part 38b of the stopper 38, so that the poured concrete does not leak to the outside. This prevents the concrete from curing and makes it easier to release the concrete after it hardens.

Now, in the method of burying the anchor bolts for fixing masonry materials having the above-mentioned configuration, the anchor bolts 36 are buried in the frame members 24 and 24 in the formwork 22.
6 and then screw the anchor bolt 36 onto it, which not only simplifies the work, but also allows the anchor bolt 36 to fit through the through hole 30 and the insertion hole 3.
2, 34, and the stopper 38 is fitted with the insertion hole 34 of the frame material 26 on the frame 20 side, and the head 36a is further tightened with a nut 40 to firmly connect it to the formwork 22 and the frame materials 24, 26. Since the anchor bolts are buried vertically, the vertical spacing, perpendicularity, and
The amount of protrusion can be reliably constructed with high precision.

Furthermore, the formwork 22 to which the frame members 24 and 26 that have been removed after the formation of the frame 20 are fixed can be conveniently reinstalled with anchor bolts 36 and erected at another location without having to be removed.

In addition, in the above embodiment, the frame materials 24, 26
Although the case where the frame material 22 is fixed to both sides of the formwork 22 has been illustrated, the above-mentioned effects can also be achieved even if the frame material 24 is used only as the outer frame material and the through hole 30 of the formwork 22 is shaped to fit with the stopper 38. I can do it.

Further, the anchor bolt 36 is not limited to a substantially L-shape, and can have various shapes such as a straight line or a crank shape.
If the reinforcement on the 0 side becomes an obstacle to embedding, it is also possible to bend the reinforcement into a shape that bypasses the reinforcement.

Furthermore, depending on the width of the formwork 22, it goes without saying that a plurality of the frame members 24, 26 can be fixed in parallel at a predetermined interval in the horizontal direction.

As described above in detail in the embodiments, in the method of burying an anchor bolt for fixing stone cladding according to the present invention, the anchor bolt is mounted and buried in a formwork using a frame material and a nut. Not only is it easy to handle, but the protrusion and verticality of the anchor bolt can be buried with high precision.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention; Figure 1 is a front view of the formwork with the formwork erected;
Figure 2 is a sectional view of the main part along the - line in Figure 1;
Figure 3 is a - line sectional view of Figure 2, Figure 4 is a cross-sectional view of Figure 2.
It is a sectional view taken along the - line in the figure. 20...framework, 22...formwork, 24...frame material, 26...frame material, 28...fixing bolt nut, 30...through hole, 32...insertion hole, 34
...Insertion hole, 36...Anchor bolt, 36a...
...Head part, 36b...Bending part, 36c...Central part,
38...Stopper, 40...Natsuto.

Claims (1)

[Claims] 1. In a method of embedding anchor bolts for fixing masonry materials in a concrete structure, holes are drilled in advance at predetermined intervals in the formwork for forming the structure, and holes are made in the formwork to correspond to the positions of the holes. After fixing the frame material with insertion holes drilled in the places to be used, and inserting and screwing the heads of the anchor bolts into the insertion holes and the through holes, set the formwork and pour concrete. A method for burying an anchor bolt for fixing stone cladding, comprising: releasing the screwing of the anchor bolt after the concrete hardens, removing the formwork, and burying the anchor bolt in the building frame.