JP2808438B2 - Laying the plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a flexible plate such as an asphalt mat.

[0002]

2. Description of the Related Art For example, asphalt mats 9 as flexible plate-like members are used for increasing friction of gravity-type structures such as caisson and L-shaped blocks, for preventing scouring at rubble mound methods such as breakwaters and seawalls, and for dams. , Reservoirs, reservoirs, etc.
It is used to protect slopes such as lake levees and coastal levee.Of these, concrete laying on the bottom of concrete caisson or steel caisson in order to increase frictional resistance is, for example, shown in Fig. 14. There is something like that shown.

[0003] This comprises a composite material 1 in which asphalt, filler, fine aggregate and coarse aggregate are mixed, a reinforcing core material 2 such as a glass fiber net and a wire rope 3 for lifting.
Embedded therein, and formed into a mat shape. In the figure, reference numeral 4 denotes a non-slip metal fitting fixed to an intermediate portion of the wire rope 3, and reference numeral 5 denotes an iron band.

[0004] In order to integrate with a gravity type structure such as a caisson or the like, prior to casting the composite material 1 into a mold and forming an asphalt mat, a wire rope 3 or a reinforcing bar separately arranged is used. 6 Tighten the annealed iron wire 7 and start it up. The asphalt mat 9 is manufactured in a factory or on-site yard. The asphalt mat 9 is lifted by a crane or the like, laid in a caisson yard, and then entangled with a bottom slab of a gravity type structure such as a caisson.

When the asphalt mat 9 is hoisted so that the asphalt mat 9 can be accurately laid at a predetermined position, both ends of the asphalt mat are hung horizontally using a wire rope 3 as shown in FIG.

[0006] Further, when tightening the annealed iron wire 7 and the caisson bottom slab bar 8, between the asphalt mat 9 and the bottom slab bar 8 to secure the concrete cover thickness of the bottom slab bar 8 as shown in FIG. The spacer block 10 is interposed.

[0007]

When the asphalt mat is to be lifted horizontally, it is hung only at both ends, so that the diameter of the hanging metal fitting is increased and the weight is increased. At high temperatures, the asphalt is softened and the deflection is increased. On the contrary, at low temperatures, the asphalt may be hardened and cracked.

Further, since the annealed iron wire protrudes,
During the production of mats, this hindered the dispensing of the mixture that had been cast, and at the time of caisson slab laying, in order to integrate with the caisson, it was necessary to entangle the reinforcing steel for the slab one by one with an annealed iron wire, The workability is not good because the reinforcing steelworker may catch on the protruding iron wire.

In the method of integrating with a caisson by using an annealed iron wire, a spacer block is used. However, at a high temperature, the asphalt mat is softened and the spacer block penetrates into the mat by a load of a reinforcing bar. The cover thickness (about 8 cm) cannot be secured.

[0010] When the asphalt mat is towed or lifted after completion of the caisson, if the annealed iron wire is loosened at all, a gap is formed between the bottom plate of the caisson and the asphalt mat to maintain the integrity of the asphalt mat and the caisson. Hard to do.

An object of the present invention is to eliminate the disadvantages of the prior art and to reduce the weight of the hanging fitting and the bending when the plate-like body such as an asphalt mat is lifted horizontally. The work of leveling the installed mixture is easy, and when caisson bottom slabs are constructed on mats, the work of tangling the annealed iron wire is unnecessary, improving workability and ensuring the concrete cover thickness of caisson bottom slab reinforcement. An object of the present invention is to provide a method of laying a plate-like body which can maintain integrity without causing a gap between the asphalt mat and the caisson when the caisson is towed and lifted after completion.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a hanging metal fitting such as an asphalt mat having a plurality of anchor fittings embedded at appropriate intervals. The gist of the present invention is to hook the attached eye bolts on anchors and lift them horizontally with a crane or the like.

[0013] Second, the gist of the invention is that the anchor fittings can be attached by replacing the anchor bolts connected to the reinforcing bar for the bottom plate of the gravity type structure constructed on the upper part of the plate-like body with eye bolts.

According to the first aspect of the present invention, the eyebolts attached to the hanging fittings are fixed to the anchor fittings embedded in the plate-like body, and the plate-like body is horizontally lifted, so that the lifting points are spaced from each other. Can be provided in large numbers,
The bending generated in the plate-like body in the suspended state can be reduced, and the diameter of the suspension fitting can be reduced, so that the weight is reduced.

According to the second aspect of the present invention, in addition to the above-described operation, after the asphalt mat is installed at a laying place such as a caisson yard, an anchor bolt attached to an anchor fitting is a bottom plate of a gravity type structure such as a caisson. Can be integrated with concrete for construction. This saves the use of annealed iron wire.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of an anchor fitting showing an embodiment of a method for laying a plate-like body of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the same with eyebolts attached thereto, and FIG. FIG. 5 is a front view in a state where an anchor bolt of another form is mounted, and FIG. 5 is a front view showing a state where an anchor is used in the method of the present invention.

As shown in FIGS. 1 and 2, the anchor 11 has an insertion hole 12 for a reinforcing bar in a leg portion and a mounting hole 13 for an anchor bolt or an eyebolt provided in an upper portion. 13 is formed in a keyhole shape including a circular portion 13a and an elongated portion 13b, and an end of the elongated portion 13b is formed in an enlarged diameter portion 13c. In the drawing, reference numeral 24 denotes a mixture inflow prevention plate for preventing the mixture from flowing into the anchor bolt or eyebolt mounting portion.

A method of lifting the asphalt mat 9 using the anchor 11 will be described below. The anchor fitting 11 is to be buried in the asphalt mat 9 at the stage of manufacturing the asphalt mat 9. The method of manufacturing the asphalt mat 9 will be described in a factory or a field yard as shown in FIGS. 6 and 7. For example, one anchor 11 within 1 m pitch corresponding to the width of the asphalt mat 9.
Is inserted into the insertion hole 12 so that the anchor metal 11 is fixed to the reinforcing bar 14 in advance by spot welding.

In this case, the mounting direction of the anchor 11 is determined so that the circular portion 13a of the mounting hole 13 formed in the anchor 11 faces the inside of the asphalt mat 9, and then, as shown in FIG. In order to prevent the asphalt mixture from flowing into the hole 13, a kraft tape 15 is stuck on the upper part of the anchor fitting 11 to close the mounting hole 13.

Next, the mold 16 is set as shown in FIG.
The roadbed paper 17 is laid on the bottom of the formwork 16. When the asphalt mat 9 is manufactured at a factory or the like, and is carried into a caisson yard by truck, the size of the mold 16 is, for example, 2.4 × 2.4 × 0.08 as the truck size.

A rustproof sheet 19 is laid on the bottom of the anchor fitting 11 and the rustproofed anchor fitting 11 is attached to the roadbed paper 17 in the formwork 16.
It is set on the upper side, and the reinforcing bar 14 is further arranged perpendicularly to the reinforcing bar 14 inserted through the anchor fitting 11.

A mixture 1 is manufactured by mixing the asphalt material, and the mixture 1 is cast to the height of the reinforcing bar 14 and the surface is leveled to produce a lower layer 9a of the asphalt mat 9, and a glass fiber net is formed on the upper surface thereof. The reinforcing core material 2 is laid on the reinforcing core material 2 and the like, and the composite material 1 is further cast on the reinforcing core material 2 to the top end of the anchor 11 to produce the upper layer 9b, thereby producing the asphalt mat 9. At this time, the anchor 11 serves as a mark of the thickness of the composite material 1 to be cast, so that the uniformity of the thickness can be easily maintained, and when leveling the surface, the flattened iron wire projects as in the conventional case. Because there is no, it is easy to do the leveling work.

In order to lift the asphalt mat 9 manufactured as described above to carry it into the caisson yard, as shown in FIGS. The eyebolt 18 has a ring-shaped hook portion 18c above a screw portion 18b provided with a thumb screw 18a, and the lower portion of the screw portion 18b is formed in an elliptical cross section. Then, after inserting the screw portion 18b into the circular portion 13a of the mounting hole 13, it is slid along the elongated portion 13b, and is rotated by 90 ° at the enlarged diameter portion 13c, thereby locking the enlarged diameter portion 13c. From this state the thumbscrew
If the bolt 18a is lightly tightened, the eyebolt 18 is locked to the anchor 11.

After the asphalt mat 9 has cooled, the eyebolt 18 of the hanging bracket is hooked and lifted horizontally using a crane or the like as shown in FIG. In this case, since the anchors 11 are attached at a pitch of, for example, 1 m, lifting by the eye bolts 18 is performed at multiple points, and not only at both ends of the asphalt mat 9,
Since the central portion is also lifted, the asphalt mat 9 hardly bends even at high temperatures, and cracks do not occur in the asphalt mat 9 at low temperatures.

Further, by suspending the eyebolt 9 from above, a force in the direction of the enlarged diameter portion 13c acts on the eyebolt 18 due to its own weight of the asphalt mat 9, so that the eyebolt 18 is securely locked in the mounting hole 13.

The suspended asphalt mat 9 is temporarily placed, covered with a poly film, lifted again by a crane, loaded on a truck or the like, and carried into a caisson yard.
Lift it again with a crane and lay it at the installation site.

In order to construct a structure such as a caisson on the asphalt mat 9 laid as described above, the eye bolt 18 is removed from the anchor 11 and an anchor bolt 21 as shown in FIG. It is inserted into the mounting hole 13, slid to the enlarged diameter portion 13c in the same manner as the eyebolt 18, and tightened and fixed at this position with a nut. In addition,
The anchor bolt 21 may be fixed by a lower cap nut as shown in FIG. 5, and in this case, the mounting hole 13 is formed not in a keyhole shape but in a circular shape.

Further, as shown in FIG. 12, joints 22 are filled in joints between asphalt mats 9 and mounting holes 13 of anchors.

Then, as shown in FIG.
Reinforcing bar 23 is arranged on 21 and tied, and the caisson bottom plate reinforcing bar is directly placed on this. As a result, the spacer block conventionally used can be omitted, the sink does not sink into the asphalt mat 9 due to the load of the spacer block, and the concrete cover thickness of the caisson bottom slab can be secured.

Further, since the anchor bolts 21 are completely embedded in the asphalt mat 9 and the caisson bottom slab and the asphalt mat 9 and the caisson are integrated, when the caisson is completed, when the tow is lifted to the installation place and lifted, There is no gap between the caisson bottom slab and the asphalt mat 9.

[0031]

As described above, the method of laying a plate-like body of the present invention can reduce the weight of the hanging metal fitting and the bending when lifting a plate-like body such as an asphalt mat horizontally. The work of leveling the mixture put in at the time of mat production is easy, and when caisson bottom slabs are constructed on the mats, the work of tangling the annealed iron wire is unnecessary, improving workability and caisson bottom slab concrete. The cover thickness can be ensured, and when the caisson is towed or lifted after completion, integrity can be maintained without any gap between the asphalt mat and the caisson.

[Brief description of the drawings]

FIG. 1 is a front view of an anchor used in the method of laying a plate-like body according to the present invention.

FIG. 2 is a plan view of an anchor used in the method of laying a plate-like body according to the present invention.

FIG. 3 is a side view showing a state in which an eyebolt is attached to an anchor used in the method of laying a plate-like body according to the present invention.

FIG. 4 is a front view showing a state where an anchor bolt is attached.

FIG. 5 is a front view showing a state where another form of anchor bolt is attached to an anchor used in the method of laying a plate-shaped body according to the present invention.

FIG. 6 is a plan view showing a state in which anchors used in the method of laying a plate-shaped body of the present invention are arranged on a reinforcing bar.

FIG. 7 is a front view showing a state in which anchors used in the method of laying a plate-shaped body of the present invention are arranged on a reinforcing bar.

FIG. 8 is a perspective view showing a state in which a kraft tape is attached to an anchor used in the method of laying a plate-shaped body according to the present invention.

FIG. 9 is a perspective view showing a state where an anchor metal used in the method of laying a plate-shaped body of the present invention is set in a mold.

FIG. 10 is a front view showing a state where an eyebolt is attached to an anchor used in the method of laying a plate-like body according to the present invention.

FIG. 11 is a perspective view of a lifted state showing an embodiment of the method of laying a plate-shaped body of the present invention.

FIG. 12 is a front view showing a state where an anchor bolt is attached to an anchor used in the method of laying a plate-like body according to the present invention.

FIG. 13 is a front view showing a state in which a scrap bar is arranged on an anchor bolt attached to an anchor used in the method of laying a plate-shaped body according to the present invention.

FIG. 14 is a partially cutaway perspective view showing a conventional asphalt mat.

FIG. 15 is a perspective view showing a conventional laying method.

FIG. 16 is a front view showing a caisson bottom slab construction method in the case of a conventional laying method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mixed material 2 ... Reinforcement core material 3 ... Wire rope 4 ... Non-slip metal fittings 5 ... Iron strip 6 ... Reinforcing bar 7 ... Annealed wire 8 ... Bottom plate reinforcing bar 9 ... Asphalt mat 9a ... Lower layer 9b ... Upper layer 10 ... Spacer block 11 ... Anchor fittings 12 ... insertion holes 13 ... mounting holes 13a ... circular portions 13b ... slender portions 13c ... enlarged diameter portions 14 ... reinforcing bars 15 ... kraft tape 16 ... formwork 17 ... roadbed paper 18 ... eye bolts 18a ... wing screws 18b ... screw portions 18b ... Hook section 19 ... Rust prevention sheet 20 ... Hanging bracket 21 ... Anchor bolt 22 ... Joint material 23 ... Screw bar 24 ... Material inflow prevention plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Iwamoto 2-10-9 Akasaka, Minato-ku, Tokyo Nihon Marine Construction Co., Ltd. (56) References Real opening Sho 61-72575 (JP, U) Real opening 56-124212 (JP, U) JP-B 51-32886 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B66C 1/00-1/68

Claims (2)

(57) [Claims] 1. A flexible plate-like body, such as an asphalt mat, in which a plurality of anchors are embedded at appropriate intervals,
A method of laying a plate-shaped body characterized in that an eyebolt attached to a hanging bracket is hung on an anchor bracket and is horizontally lifted by a crane or the like. 2. The method of laying a plate-like body according to claim 1, wherein the anchor fitting is attached to the gravity-type structure constructed above the plate-like body by replacing an anchor bolt coupled to a reinforcing bar for a bottom plate with an eye bolt. .