JPH11350409A - Joint structure for precast pc board pavement using pad board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the displacement of a joint by installing a board body below the joint of oppositely arranged precast PC boards, and connecting the board body and the precast PC boards with connecting members. SOLUTION: Notch sections 12, 22 buried with steel cylindrical boxes at the prescribed intervals are provided at the end sections of precast PC boards 11, 21. At the time of execution, a rolled crushed stone layer 36 is excavated to install a pad board 31, crushed stones 35 are installed on both sides, asphalt 34 is installed at the same height as the surface of the pad board 31, then the PC boards 11, 21 are installed. Cement mortar is filled on the back of the PC boards 11, 21 and in a joint 37, and bolts 13, 23 are inserted from the through holes of the bottom plates 12c, 22c of the steel cylindrical boxes and screwed to the inserts 32a, 32b of the pad board 31 after the mortar is hardened. Covers are screwed to the upper screw ridges 12a, 22a of the steel cylindrical boxes after the PC boards 11, 21 and the pad board 31 are connected together. The vertical movement of the joint section of the precast PC boards 11, 21 and the occurrence of a step between the precast PC boards 11, 21 can be prevented, and the precast boards 11, 21 can be efficiently replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a precast prestressed concrete plate (hereinafter referred to as "Precast P
C version ").

[0002]

2. Description of the Related Art When paving a wide surface such as a road surface, in order to save labor, shorten the construction period and improve quality, instead of asphalt or cast-in-place concrete,
In some cases, a plurality of precast PC plates are connected and paved. In this case, joints between the precast PC plates are present on the pavement surface in the vertical and horizontal directions, and these joints are connected by a structure as shown in FIG. That is, two precast PC versions 41 and 49
Are provided with notches 42 and 47, respectively. From these notches 42 and 47, sheath tubes 43 and 46 are embedded so as to communicate with the joint surfaces.
A housing sheath tube 48 is embedded in the plate 49. In addition, crushed stones are laid on the road surface in advance and compacted, and asphalt is laid on the crushed stones.
49 are installed. A steel rod 45 is inserted in advance into the sheath tube 46 and the sheath tube 48 for storage of one of the precast PC plates 49.
After abutment of the steel rod 45 with the sheath tube 4,
3 and 46, two washers are fitted to both ends, nuts 50 and 50 are screwed together, and two precast PC plates 4
1, 49, and joints 44 and precast P
Mortar is filled on the back of the C plate.

[0003]

In the above conventional joint structure, the precast PC plates 41, 49 are driven by the running of the vehicle.
When a long-term repetitive load acts on the joints of the precast PC plate 4
1, 49 are damaged from the joint 44, and there is a drawback that they can easily move up and down or a step occurs. In order to solve such a disadvantage, although not shown, a structure in which a PC steel rod is inserted into the sheath tube in place of the steel rod 45, and this is tensioned to introduce a prestress is also used. However, such joint structures are wasteful due to excessive specifications on light-load road surfaces, and special gearboxes for tensioning PC steel bars are cumbersome to handle. And replacement takes time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional connection structure, and has as its object to suppress the vertical movement and the step at the joint of the precast PC plate. It is an object of the present invention to provide a joint structure capable of easily performing plate replacement work.

[0005]

According to the present invention, there is provided a joint structure for pavement formed by connecting precast PC plates in series,
A plate body is laid under joints of the precast PC plate to be arranged to face each other, and the plate member and the precast PC plate are connected by connecting members, respectively. A box member is buried in the opposing portion, the box member has a lid that can be opened and closed on the front side of the precast PC plate, the box member has a through hole at the bottom to the back surface of the precast PC plate, and the connection member is And a joint structure extending from the inside of the box member to the plate through the through hole. Here, it is preferable that the lid of the box member is formed so as not to protrude from the front side of the precast PC plate when closed.

In the joint structure according to the present invention, adjacent precast PC plates are separated from each other by a steel rod or a PC as in the prior art.
By directly connecting adjacent precast PC plates and plates without connecting them directly using steel bars,
The precast PC plates are indirectly connected to each other via the plate. Therefore, the plate enhances the support of the roadbed around joints that are likely to be weak points of the precast PC version,
Vertical movement at joints of the precast PC plate can be prevented. Also, the adjacent precast PC
Since the printing plates are connected to the printing plate by the connecting members, it is possible to almost completely prevent a step between the precast PC plates. In addition, a box member that can be opened and closed is buried on the front side of the precast PC plate, and the connecting member is extended from the box member to the plate, so the connecting member can be easily removed, and the precast PC plate can be replaced. Work efficiency can be improved.

[0007]

The present invention will be described in more detail with reference to the following examples.
The present invention is not limited to these. In FIG. 1, joints 3 of the precast PC plates 11 and 21 connected in series are shown.
A pillow slab 31 is laid below 7, and the pillow slab 31 and the precast PC slabs 11 and 21 are connected by bolts 13 and 23 as connecting members, respectively.

Here, the precast PC plates 11 and 12 are used.
Notches 12 and 22 are formed at predetermined ends along joints 37 at one end. These notches 12, 22
Is formed by burying a steel cylindrical box when manufacturing the precast PC plates 11 and 21. This steel cylinder box is a cylinder 1
2b, a bottom plate 12c having a through hole formed at the lower end of 22b,
A screw thread 12a is formed on the inside of the upper end, and a lid (not shown) is screwed onto the thread threads 12a, 22a so that the inside can be opened and closed. The lid is provided with a groove or a hole on its surface so that it can be opened and closed by turning with a screwdriver or the like, and the lid is screwed into the screw threads 12a and 22a to close the cylindrical box. Are formed so as not to protrude above the surfaces of the precast PC plates 11 and 21.

The pillow plate 31 is formed of a long plate made of concrete. That is,
The joint 37 is formed over substantially the entire length, that is, substantially the same length as the end sides of the precast PC plates 11 and 21, and the width thereof is set to be equal to the width of both the precast PC plates 11 and 11 sandwiching the joint 37.
21 is formed to have a length that can sufficiently support it. Also, as shown in FIG. 1, the pillow plate 31 is preferably arranged such that the widths W1 and W2 located below the precast PC plates 11 and 21 are substantially the same. Is, for example, a precast PC version 11,
21 dimensions are approximately vertical x horizontal x thickness = 2000 x 10000
When it is about × 170 mm, it is preferable to form it to about 800 to 1000 mm. Furthermore, the pillow plate 31 includes
Inserts 32a, 32b into which the bolts 13 can be screwed are buried at positions facing the through holes of the bottom plates 12c, 22c of the steel cylindrical box.

Next, the precast PC plates 11, 21 are described.
The construction method of pavement by continuously connecting is described. First, the crushed stone 36 is spread on the road surface and compacted, and the crushed stone layer 3 after compaction.
Excavation is performed at a predetermined location of No. 6 to form a concave portion for installing the pillow plate 31, and the pillow plate 31 is installed here. At this time, pillow plate 3
The surface 1 is arranged so as to be higher than the surface of the crushed stone layer 36 by a predetermined length. Next, crushed stones 35 are laid in gaps on both sides of the pillow plate 31 and compacted. Asphalt 34 is laid on the crushed stones 35 and 36 to the same height as the surface of the pillow plate 31. Then, the precast PC plates 11 and 21 are set on the asphalt 34 and the pillow plate 31, and the height is adjusted using height adjusting bolts (not shown) or the like, and the precast PC plates 1 and 21 are adjusted.
The cement mortar is filled into the backs of the bases 1 and 21 and the joint 37. When the backfill mortar 33 is hardened, the bolts 13, 23 are inserted through the through holes of the bottom plates 12c, 22c in the steel cylindrical box.
Into the inserts 32a and 32b, thereby connecting the precast PC plates 11 and 21 and the pillow plate 31. Finally, the lids are screwed into the cylindrical screw threads 12a and 22a, and the cylinders 12b and 22b are screwed. To close.

Next, a method of replacing the precast PC version 11 will be described. At the time of replacement, remove the lid of the steel cylinder box of the precast PC plate 11 that needs to be replaced, remove the bolt 13 inside, and
The connection between the C plate 11 and the pillow plate 31 is released. After removing the precast PC version 11, the asphalt 34
The back mortar 33 above the mortar 33 is removed and straightened, a new precast PC plate (not shown) is laid, and the height is adjusted according to the adjacent precast PC plate 21. After this,
If the same steps as the above-mentioned pavement method are performed, the replacement work is completed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a joint structure of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 11,21 Precast PC plate 31 Pillow plate (plate) 13,23 Bolt (connecting member)

Claims (1)

[Claims] 1. A joint structure of a pavement formed by connecting precast PC plates in a continuous manner, wherein a plate is laid under joints of the precast PC plates arranged opposite to each other, and the plate and the precast PC plates are arranged. Are connected by a connecting member, a box member is embedded in the precast PC plate at a position facing the plate, and the box member has a lid that can be opened and closed on the front side of the precast PC plate, The joint structure, wherein the box member has a through hole at the bottom to the back surface of the precast PC plate, and the connecting member extends from inside the box member to the plate through the through hole.