JPH0457802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a precast concrete slab laying method in which precast concrete slabs are arranged and a filler such as mortar is filled on the lower surface thereof.

(Prior Art) Conventionally, as shown in Fig. 6, precast concrete slabs have been used in a precast concrete slab laying method in which a plurality of precast concrete slabs such as reinforced concrete are laid to form paved surfaces for roads, airports, etc. A roadbed 5 for laying is prepared by a conventional method by forming a filler injection port 2 and an exhaust hole 3 through communication openings from the front surface to the back surface of the concrete slab 1, and wrapping the bottom outer surface of the concrete slab 1 with a synthetic resin film 4. The temporary fixing fittings 6 are fixed to the upper surface of the joint edges of each concrete slab to make the surface height of each concrete slab 1 uniform, and then the filling material injection port 2 is used to mix the concrete slabs. A method of injecting filler 7 into resin film 4 is known (Japanese Patent Publication No. 59-21402).

(Problems to be Solved by the Invention) In this conventional method, the bottom outer surface of the precast concrete slab 1 is wrapped with a synthetic resin film 4. However, if this is done at a precast concrete slab manufacturing factory, the synthetic resin film 4 will be removed during transportation. The resin film 4 is easily damaged, and if it is torn, there is a problem that the filler 7 that is injected into the underside of the concrete slab 1 and into the synthetic resin film 4 during construction will leak out from the damaged parts of the synthetic resin film 4. Ta.

In addition, if wrapping work with synthetic resin film 4 is to be carried out at the construction site, it is necessary to carry out the work by several people, as the size of a single precast concrete slab is becoming larger.
Another problem was that the work was extremely difficult when the wind was strong.

The present invention has been made in view of these conventional problems, and aims to provide a method for laying precast concrete slabs that can efficiently perform the laying work of precast concrete slabs with less labor. That is.

(Means for Solving the Problems) The gist of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is to precast the top surface of the roadbed prepared by a conventional method. In a precast concrete slab laying method in which a filler is injected from a filler injection port formed through the concrete slab between the concrete slab and the roadbed after arranging the concrete slabs, the back side of the precast concrete slab An elastic tape-like material is pasted in an annular shape along the outer peripheral edge of the roadbed, and the annular portion corresponding to the tape-like material is placed on the same plane on the upper surface of the roadbed using a synthetic resin film. Covering the upper surface, then placing and laying the precast concrete slab on the synthetic resin film, and injecting a filler between the lower surface of the precast concrete slab and the synthetic resin film from the filler injection port. The method of laying precast concrete slabs is characterized by:

(Function) In the precast concrete slab laying method configured as described above, when laying a precast concrete slab on the roadbed for laying, an elastic tape is placed on the back side of the precast concrete slab in advance along the outer periphery. The tape-shaped material is pasted in an annular shape, and the upper surface of the roadbed is covered with a synthetic resin film with the annular portion corresponding to the tape-shaped material located on the same plane on the upper surface of the roadbed, and then the precast concrete Since the slab is laid by placing it on the synthetic resin film, the synthetic resin film can be reliably adhered to the tape-shaped material attached to the outer peripheral edge of the back surface of the precast concrete slab just by laying it on the roadbed. becomes.

In addition, due to the action of the tape-shaped material attached to the outer peripheral edge of the back surface of the precast concrete slab, the work of installing, connecting, and filling the precast concrete slabs is performed one by one for each precast concrete slab as a unit. It is possible to do it.

(Example) Next, an example of implementation of the present invention will be described with reference to FIGS. 1 to 5.

10 in the figure is a precast concrete plate made of concrete used in this example.
This concrete slab 10 is manufactured in advance in a factory, and has a filler injection port 11 for backfilling and an exhaust hole 12 in the center thereof through openings on the front and back sides. At the lower end of the filler injection port 11, a recess 11a is formed with an enlarged diameter for smooth injection.

Further, upwardly arcuate connecting holes 12a, 12a, .
are formed at regular intervals.

These concrete slabs 10 are arranged one after another to form a paved surface. Prior to laying the concrete slabs 10, a roadbed 13 for construction is prepared in the construction area using methods such as compaction to reduce surface irregularities, as in the past. Then, a synthetic resin film 14 is coated on this roadbed 13.

When laying the concrete slab 10, the concrete slab 10 is lifted in advance by a hanging device using a crane or the like, and a highly elastic tape-like material 15 is pasted in a ring shape on the back side of the concrete slab 10 along the outer periphery. Next, the hanging device is lowered and installed on the synthetic resin film 14 spread on the roadbed.

As an example of this tape-like material 15, for example, a tape-like material 15 in which a butyl adhesive with a release paper is applied to one side in advance is used, and the release paper of this tape-like material 15 is peeled off and the adhesive is applied. Tape material 15
is pasted on the outer peripheral edge of the back surface of the concrete slab 10.

Connecting holes 12a, 12 are opened in the respective joint end surfaces 10a of the concrete slab 10 adjacent to each other.
a... are placed on the synthetic resin film 14 on the roadbed 13 with the parts a communicating with each other.

During this placement, the surface heights of the concrete slabs 10, 10... placed on the roadbed 13 are made uniform, and at the same time, the upper surface of the entire annular portion of the synthetic resin film 14 corresponding to the tape-shaped material 15 is Pillow material 16 made of iron plate is placed on the same plane.
are placed on the lower surface of the four corners of the concrete slab 10.

In addition, after placing the concrete plate 1 as necessary.
A temporary fitting (not shown) may be fixed to the upper surface so as to straddle between 0 and 10 to eliminate the joining step.

In this way, concrete plates 10, 10...
After laying the filler material 17, as shown in FIG. 4, the filler material 17 is injected from the filler inlet 11 described above using a pump (not shown) as appropriate. At this time, filler 1
7 is injected between the lower surface of the concrete slab 10 and the synthetic resin film 14, and the synthetic resin film 14
The air enters the paving roadbed 13 while being forced to expand and conform to the irregularities on the upper surface, and the air inside is pushed out through the exhaust hole 12 to fill the air.

Incidentally, the filling material 17 may be poured after making the surface heights of the plurality of concrete slabs 10, 10 uniform and connecting them to each other using connecting means consisting of connecting rods and grout, which will be described later. Further, the step may be carried out after the surface height of each concrete slab 10 is made uniform and before the connection by the connecting means, or it may be carried out every time one concrete slab 10 is placed on the roadbed 13 for laying. be.

In addition, when connecting the concrete slabs 10, 10, as shown in FIG. Then, grout 19 is injected through the upper opening, and as the grout 19 hardens, the concrete slabs 10, 10 are connected. In addition, it goes without saying that various other conventionally used connecting means can be used.

(Effects of the Invention) The precast concrete slab laying method of the present invention is configured as described above, and when laying the precast concrete slab on the roadbed for laying, the back surface of the concrete slab is preliminarily coated with elastic material along the outer peripheral edge. A tape-shaped material is pasted in an annular shape, and the top surface of the roadbed is covered with a synthetic resin film with the annular portion corresponding to the tape-shaped material located on the same plane on the top surface of the roadbed, and then a precast concrete slab is applied. By placing the grout on a synthetic resin film and laying it, an independent grout injection gap is formed for each precast concrete slab. Since it is possible to inject filler, it is possible to install, connect, and connect precast concrete slabs.
The work of injecting the filler material can be performed sequentially for each precast concrete slab.
This makes it possible to lay precast concrete slabs efficiently. Compared to conventional methods, the synthetic resin film is not coated at the factory, so there is no chance of it tearing during transportation.
In addition, it has become possible to work more efficiently on-site with less influence from wind and other factors.

[Brief explanation of the drawing]

Figure 1 is a partially omitted cross-sectional view of a precast concrete slab with a tape-like material attached to it, Figure 2 is a partially omitted cross-sectional view of a synthetic resin film coated on the top surface of the roadbed, and Figure 3 is A cross-sectional view of the precast concrete slab installed, Figure 4 is a cross-sectional view of the filler injected state, Figure 5 is a cross-sectional view of the completed state,
FIG. 6 is a sectional view showing the state of laying a conventional precast concrete slab. 10... Precast concrete version, 11...
... Filler injection port, 13 ... Roadbed for laying, 14 ...
Synthetic resin film, 15... Tape-shaped material, 17...
...Filling material.

Claims (1)

[Claims] 1 After arranging precast concrete slabs on the top surface of the roadbed prepared by a conventional method, a precast concrete slab is injected between the concrete slab and the roadbed through a filler injection port opened through the concrete slab. In the cast concrete slab laying method, an elastic tape-like material is pasted in an annular shape along the outer peripheral edge on the back side of the precast concrete slab, and the annular part corresponding to the tape-like material is on the same plane on the upper surface of the roadbed. The upper surface of the roadbed is covered with a synthetic resin film placed above, and then the precast concrete slab is placed on the synthetic resin film and laid, and the precast concrete slab is poured through the filler injection port. A precast concrete slab laying method characterized by injecting a filler between the lower surface of the concrete plate and the synthetic resin film.