JP3198136B2 - Precast pavement laying method - 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 of laying a precast pavement slab for constructing a road on site.

[0002]

2. Description of the Related Art In general, a pavement slab is a structure having a surface spread, and in a state where a pavement slab is commonly used, a shear force acting between the pavement slab and a roadbed hardly causes a problem.

[0003]

On the other hand, a paved slab laid at a place where a heavy vehicle repeatedly stops and departs, or at a place where a vehicle repeatedly stops and departs, on a sloping road. In this case, there is a problem in that the paving slab is displaced by a shearing force constantly acting between the paving slab and the roadbed.

[0004] In general, the pavement slab and the roadbed are integrated by a backfill material filled between the pavement slab and the roadbed, but the purpose of filling the backfill material is to cause damage to the pavement slab and the roadbed. It is to fill the gap between them and is not intended to resist the shear forces acting between the paving slab and the subgrade.
In the case of a subbase made of a material other than concrete, the shear transfer between the backfill and the subbase should not be sufficient to lay a vinyl film on the subbase to prevent the backfill from penetrating into the subbase. Further, although the backfill material is generally made of a material that is unlikely to cause breathing, there is no method for confirming that the backing material is completely adhered to the lower surface of the pavement plate. The transmission of shear forces cannot be achieved by backfill.

[0005] As described above, the backfill material injection method cannot reliably transmit the shear between the pavement slab and the roadbed, so that the conventional shear transmission between the pavement slab and the roadbed is problematic. It is rare to apply the method of laying precast pavement slabs at such places.

Accordingly, an object of the present invention is to provide a method of laying a precast pavement slab having a reliable shear transmission characteristic by a shear key while retaining the advantage of the conventional method that rapid construction is possible. .

[0007]

In order to achieve the above object, a method for laying a precast pavement slab according to the present invention comprises forming an opening in a roadbed on which the precast pavement slab is laid.
After laying an iron plate on the bottom of the opening and laying a precast paving slab, rotate the height adjustment rod with a jig in the insert provided in advance on the precast paving slab and use it to fix the iron plate of the roadbed Adjust the height of the precast paving slab, then inject backfill material between the precast paving slab and the roadbed and into the opening to integrate the precast paving slab, the roadbed, the iron plate and the height adjusting rod, It is characterized in that the shear force is transmitted between the precast pavement slab and the roadbed while the slab is embedded.

[0008]

In a concrete roadbed, a cylindrical opening is provided at a position where the height adjustment bolt is located at the same time when the roadbed is cast, and an iron plate serving as a base for height adjustment is laid on the bottom of the opening. For roadbeds made of materials other than concrete,
Before the roadbed is hardened, a steel pipe is buried in the precast pavement slab at a position where the height adjustment bolt is located.

[0009] The function of the steel pipe is to strengthen the section where the shear key operates and to increase the bearing area by the steel pipe to increase the effect of shear transmission to the roadbed, and the backfill material escapes in the lateral direction of the roadbed. It is to prevent. Then, as in the conventional method, lay a vinyl film to prevent the backfill material from penetrating into the inside of the steel pipe and the roadbed, lay a steel plate as a base for height adjustment in the steel pipe at the same time, Prepare for laying.

The height of the laid precast paving slab is adjusted by a height adjusting rod located in the opening or in the steel pipe. In this invention, instead of removing the height adjustment bolt from the precast pavement plate after grout material injection using a hexagon bolt as in the conventional method, cut the hexagonal head of the bolt, cut the screw on the side, and A height-adjusting rod with a minus, plus or square groove or protrusion in the part is embedded in the insert for the entire length, and after adjusting the height, it is still embedded in the precast pavement plate. The method of transmitting the shearing force is adopted. Embedding the height adjustment rod into the insert of the precast paving slab forms a minus, plus or square groove or protrusion on the head of the adjustment rod and a minus, plus or square at the tip of the rotating shaft. A rotary insertion jig having a convex or concave shape and having a handle in a direction perpendicular to the rotation axis is manufactured, and this jig is used.

Thereafter, a backfill material is injected between the precast paving slab and the roadbed. The backfill material is filled between the precast paved slab and the roadbed and into the inside or opening of the pipe, and the height adjusting rod and the steel pipe are filled. In addition, the concrete in the pipe or the concrete in the opening is integrated so as to smoothly transmit the shear from the precast paving slab to the roadbed.

According to the above method, it is possible to construct a precast pavement having a shear key for transmitting a shear force to a roadbed simply and quickly.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of the embodiments shown in the accompanying drawings.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 of the drawings shows an embodiment of a method for laying a precast pavement slab according to the present invention in which the roadbed is a concrete slab. Correspondingly, an arrangement position of the precast paving slab 1 is determined in advance, and a cylindrical opening is formed at the position of the height adjusting rod 7 set in the insert 6 previously buried in the precast pavement slab 1 at the same time when the concrete roadbed 2 is poured. The iron plate 5 is laid in the opening 3. A screw hole is provided in the insert 6 previously buried in the precast paving slab 1, and a height adjusting rod 7 made of a bar-shaped steel material having a thread cut therearound is screwed into the screw hole. The height adjusting rod 7 is provided with a minus, plus, or square groove or projection on the head, and a projection or groove corresponding to the groove or projection on the head is provided at the tip and in a right angle direction. The rotation is adjusted by a rotation insertion jig 10 for a height adjustment rod having a handle.

Thus, the precast paving slab 1 is arranged at a required position, and the rotary insertion jig 10 is inserted into the insert 6 previously embedded in the precast paving slab 1 to rotate the height adjusting rod 7 in the insert 6. Then, the height adjusting rod 7 is adjusted on the iron plate 5 in the opening 3. In this way,
After the precast paving slab 1 has been installed at the required height,
A grout material 8 as a backfill material is injected between the precast paving slab 1 and the roadbed 2 and into the opening 3 to integrate the precast paving slab 1, the roadbed 2, the iron plate 5, the height adjusting rod 7 and the like. The laying of the precast paving slab 1 is completed.

As such a precast pavement plate 1,
For example, precast P with a size of 1.5m x 3.5m x 0.2m
A C-plate can be used, and an insert 6 of D41 is embedded in four places, and a height-adjusting rod 7 is a steel rod 300 mm in length and M30 threaded.

FIG. 2 shows another embodiment of the method for laying a precast pavement slab of the present invention in which the base is made of a material other than concrete, and the precast pavement used in the same manner as the previous embodiment. The position of the precast paving slab 11 is determined in advance in accordance with the size of the plate 11, and the position of the height adjusting rod 17 set on the insert 16 previously embedded in the precast paving slab 11 is marked on the roadbed 12. , Φ165.2 × 6.0 (1 =
200 mm) of steel pipe 13 is driven. Although a steel pipe is used in this embodiment, a square steel pipe may be used. The upper roadbed 12 is a cement stabilization treatment layer, and the lower roadbed is made of a slasher orchid. Next, the steel pipe 13
Take the subgrade soil from the inside and level the surface so that the depth becomes 150 mm. After that, the height of the roadbed is adjusted by rolling around the steel pipe 13.

Next, grout material 1 used as backfill material
Vinyl film 19 so that 8 does not seep into the roadbed
On the roadbed. Similarly, a vinyl film 19 is laid on the inside of the steel pipe 13, and a φ1
An iron plate 15 of 45 × 6.0 (mm) is placed. First, steel pipe 1
The reason why the roadbed soil in 3 is flattened is that the iron plate 15 can be stored in a horizontal state.

The numerical values in the above embodiment correspond to the construction conditions in the embodiment, and are determined at actual sites in consideration of various construction conditions.

[0020] Thus, when these roadbed work is completed,
The installation of the precast paving slab 11 begins. First, the precast paving slab 11 is positioned, and the steel pipe 13 embedded at the position where the height adjusting rod 17 is located is set.
Is selected in advance so that positioning can be performed with a margin. Subsequently, the height of the precast pavement slab 11 is adjusted. In this embodiment, as in the previous embodiment, for example, inserts 16 of D41 are embedded in four places of the precast paving slab 11, and a height adjusting rod 17 is made of a steel having a length of 300 mm and a M30 thread. A stick is used. The head of the height adjusting rod 17 is grooved so that the entire length is embedded in the precast paving slab 11. For this purpose, the rotation insertion of the height adjusting rod 17 is performed by using a rotary insertion jig 2 having a minus-shaped convex portion at its tip.
0 is inserted into the insert 16.

After a series of operations on the precast paving slab 11 following the height adjustment operation, the grout material 18 is injected. The grout material 18 is a precast pavement plate 1
Filling not only between 1 and the roadbed 12 but also into the steel pipe 13. In this embodiment, the steel pipe 13 and the height adjusting rod 17 are used.
In order to enhance the integration of the steel pipe 13, the steel plate 13 is laid on the steel plate 13 and then the reinforcing steel is welded to the inner surface of the steel pipe 13 to obtain good results. The grout 18 is filled with a material having good fluidity.

With respect to the shear key, a concave portion is provided on the lower surface of the precast plate, and the shear key can be constructed not only on the roadbed but also on the precast plate side. However, it may not be possible to provide a recess of an appropriate size depending on the arrangement of reinforcing bars in the precast plate. Therefore, the adoption is determined in consideration of the magnitude of the acting shearing force.

[0023]

According to the method for laying a precast pavement slab of the present invention, a pavement slab having a shearing key can be easily constructed at a construction speed which is completely the same as the on-site laying work of a precast PC slab by a conventional method. By applying the present invention to a slope or the like where there has been little construction example, a highly reliable precast paving slab can be laid. Furthermore, in the method of laying the precast pavement slab of the present invention, the height adjustment bolt is rotated and inserted into the precast pavement slab in the conventional method, and the grout material is injected between the precast pavement slab and the roadbed. Since the work of pulling out can be done only by rotating and inserting the height adjusting rod, it can be easily applied to the conventional method that does not require a shear key by omitting the work of embedding the steel pipe in the roadbed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a method for laying a precast pavement slab according to the present invention.

FIG. 2 is a schematic view showing another embodiment of the method for laying a precast paving slab of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast paving slab 2 Concrete roadbed 3 Opening 5 Iron plate 6 Insert 7 Height adjustment rod 8 Grout material 10 Rotation insertion jig 11 Precast paved slab 12 Non-concrete roadbed 13 Steel pipe 15 Iron plate 16 Insert 17 Height adjusting rod 18 Grout Material 19 Vinyl film 20 Rotation insertion jig

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuo Iwai 1-1-19-11 Kyobashi, Chuo-ku, Tokyo Japan Inside the Udo Co., Ltd. (72) Inventor Masaka Fujiya 1-19-111 Kyobashi, Chuo-ku, Tokyo Japan (56) References JP-A-61-169504 (JP, A) JP-A-51-73834 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01C 5 / 06-5/10

Claims (1)

(57) [Claims] (1) Opening a roadbed on which a precast paving slab is laid
Form the mouth and lay an iron plate on the bottom of the opening,
After laying the precast paving slab, adjust the height of the precast paving slab to the iron plate of the roadbed by rotating the height adjustment rod using a jig in the insert provided in advance on the precast paving slab, and then Inject backfill material between the pavement plate and the roadbed and into the opening to integrate the precast pavement plate, the roadbed, the iron plate and the height adjustment rod, and leave the height adjustment rod embedded and between the precast pavement plate and the roadbed. A method of laying a precast pavement slab, characterized in that the shear force is transmitted by the