JPH0684605B2 - How to repair the height of concrete pavement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a concrete edge, which is integrated with the placed concrete side when the concrete is placed and is cut off from the underlying roadbed. The present invention relates to a method for restoring the height of a concrete paving slab using a cutting material.

(Prior Art) Conventionally, in the case of cast-in-place concrete paving, a synthetic resin sheet called roadbed paper or paper material is laid on the surface of the foundation roadbed on which cast-in-place concrete is placed, and concrete is placed on it. However, the cement paste is prevented from penetrating into the foundation roadbed.

On the other hand, in recent years, as a method of repairing the submerged pavement, holes for jack insertion are punched at appropriate intervals in the submerged part of the concrete pavement, and the concrete pavement is lifted by inserting a jack into the hole, A method has been developed in which a filler is injected into the void formed underneath to increase the volume.

(Problems to be Solved by the Invention) The conventional roadbed paper as described above has poor durability, and in particular, a paper-made baseboard has a problem that it becomes extremely weak when wet with water and serves no purpose.

Also, lift the submerged concrete paving slab,
In the method of injecting the filler underneath to restore the bulk, when the filler needs to be inflated and restored and then needs to be lifted again, if the previously injected filler adheres to the concrete paving slab, the weight will be excessive. Therefore, there is a problem in that the metal fitting for lifting which has been previously inserted cannot be used and the working hole has to be re-drilled, which is extremely uneconomical.

In view of such a conventional problem, the present invention, when placing concrete, adheres to the concrete to make an edge cut with other parts, and once the edge is made, the concrete is put on the surface. Even when it is spliced, the edge is completely cut off from the previous concrete, the concrete pavement is lifted and the filler is injected under it. The purpose is to provide a method for restoring the height of a concrete paving slab that has been trimmed.

(Means for Achieving the Object) The features of the present invention for solving the above-mentioned conventional problems are:
A concrete edging material obtained by integrally fixing a synthetic resin fiber layer made of a non-woven fabric or the like on one side of a synthetic resin sheet is laid on the surface of a foundation roadbed for paving with the synthetic resin fiber layer side facing up, and the concrete After placing the necessary reinforcement on the edging material, cast in-place concrete to form a concrete pavement plate, and work in the sinking area of the concrete pavement plate to penetrate the front and back sides of the concrete pavement plate. Forming holes at regular intervals, excavating the foundation roadbed under and around the holes through the working holes to form a working space under the paving slab, and forming a reaction plate at the bottom of the working space. For each hole, a lower end side is supported at its lower edge to attach a cylindrical jack mounting bracket, a jacking bracket is attached to the jack mounting bracket, a reaction force is applied to the reaction plate, and the concrete paving plate is used by the jack. Lift is to fill the filling material in the gap concrete pavement block copy made by lifting it.

(Operation) In the method for repairing the height of a concrete paving slab according to the present invention, a concrete edging material is laid on the surface of a foundation roadbed for paving with a synthetic resin fiber layer facing upward, and concrete is laid on the surface. As a result, the synthetic resin fibers are integrally embedded in the concrete, and the synthetic resin fibers are attached so that they cannot be easily peeled off.
Then, at the time of restoration by raising the concrete pavement by raising it, the edging material is always fixed to the concrete pavement side even if a filler is injected into the lower surface of the pavement,
Since the filling material injected after lifting is always cut off, the lifting metal fitting once inserted under the pavement plate can be used for lifting and repairing again.

(Example) Next, the Example of this invention is described about drawing.

FIG. 1 shows a partially enlarged cross section of a concrete edging material used in the present invention. This concrete edge material 1
Is constructed by integrating a synthetic resin fiber layer 3 made of a nonwoven fabric using polypropylene fibers on one surface of the polypropylene sheet 2 by heat fusion.

The synthetic resin fiber layer 3 and the polypropylene sheet 2 may be fixed to each other using an adhesive.

When this concrete edging material 1 is used, the synthetic resin fiber layer 3 is fixed to the concrete 4 when the concrete is newly installed, as shown in FIG. Is embedded in the concrete 4 and a strong bond is obtained.

FIG. 3 shows a cast-in-place concrete paving slab constructed using the concrete edging material described above. This pavement version
Explaining the construction method of 10, the necessary foundation roadbed 12 is piled on the pavement foundation ground 11 with cobblestone, crushed stone, sand, etc. and compacted and molded.

Next, the concrete edging material 1 described above is laid on the surface of the foundation roadbed 12 with the synthetic resin fiber layer 3 facing upward. Then, the necessary rebar 13 and the necessary PC steel 14 on top of it
Are placed, concrete 15 is placed by embedding them, and after hardening, PC steel material 14 is tensioned and prestressed to form prestressed concrete pavement 10. If the structure is not prestressed concrete, ordinary steel will be used.

Next, the height restoration process after the concrete paving slab 10 constructed as described above is partially submerged due to subsidence of the foundation road slab 12 will be described.

4A to 4H sequentially show the outline of the repair process. First, the shape of the subsidence area of the concrete paving slab 10 and the height of each part thereof are measured over the entire area.

Next, as shown in FIG. 4A, working holes 21 are formed over the entire subsidence area. This work hole 21 is a circular pavement with a diameter of about 150 m / m and a concrete paving plate made by a core removing cutter 22.
The surface of 10 is penetrated from the back to the opening.

After opening the working holes 21, as shown in FIG. 4 (b), for each working hole 21, the surface portion of the foundation roadbed 12 under and around the working holes is excavated, and the working space 23 is placed under the paving slab. To form. This excavation is performed by sucking the excavated soil with a vacuum using an electric tool having an excavating blade whose diameter is expanded in the radial direction by rotating, for example. Then, as shown in FIG. 4C, concrete is poured on the bottom surface of the excavation hole to form a reaction plate 24 having a flat surface.

Further, when the strength of the foundation roadbed 12 can sufficiently support the reaction force of the jack to be described later, the excavated surface 25 itself may be used as the reaction plate without placing concrete.

After forming the reaction plate 24, as shown in FIG. 4 (d) and FIG.
The fixing metal fitting 27 is installed on the reaction force plate 24 in the center. As shown in FIG. 5, the jack mounting metal fitting 26 is composed of an inner cylindrical portion 28 located in the working hole 21 and an overhanging portion 29 projecting from the outer periphery of the lower end of the cylindrical portion 28 to the concrete pavement slab 10. ing. The overhanging portion 29 is configured such that a divided piece obtained by dividing the disk into three parts can be assembled to the lower end of the cylindrical portion 28 in the working hole space 23 under the pavement plate 10. In addition, the fixing bracket 27 is formed in a disk shape,
The upper end of the jack mounting bracket 26 when placed on the reaction plate 24
A plurality of sheets are piled up at a height to be inserted into the cylindrical portion 28 to form a columnar shape.

A female thread 30 is engraved on the inner surface of the cylindrical portion 28 of the jack mounting metal fitting 26, and a ring-shaped lock nut 31 having an external thread engraved on the outer periphery thereof is screwed into the jack mounting metal fitting 26. The lock nut 31 is formed in such a size that the lower end face of the fixing metal fitting 27 comes into contact with the upper end peripheral portion of the lock nut 31. The upper end face of the lock nut 31 is a tool for turning and screwing the same. The engagement hole is opened.

Jack mounting bracket 26 and fixing bracket configured as described above
27 is attached to each work hole 21 to complete the preparatory work, and then the lifting work is carried out using the lifting jack 50 as shown in FIGS.

The lifting jack 50 used for lifting work has a cylindrical ram chair 51 having a window 51a in its periphery as shown in FIG. 5, and the lower end of the ram chair 51 is the cylindrical portion 28 of the jack mounting bracket 26 described above. The upper end is screwed.
The outer periphery of the lower end of the hydraulic cylinder 52 is fixed to the upper end of the ram chair 51, and the ram 53 is hydraulically moved in and out of the center of the lower end surface of the hydraulic cylinder 52. The upper end of a cylindrical steel extension rod 54 is in contact with the tip of the ram 53. The lower end of the extension rod 54 is brought into contact with the upper end of the fixing bracket 27 described above, and the ram 53 is pushed out to extend the extension rod 54.
The upper surface of the fixing metal fitting 27 is pushed via 54, the reaction force pulls up the ram chair 51, and the concrete paving slab 10 is lifted up via the jack mounting metal fitting 26. On the other hand, between the ram chair 51 and the extension rod 54, a cylindrical nut swivel tool concentric with them is arranged.
55 is inserted. This nut turning tool 55 is provided with a nut engaging protrusion 56 at the lower end, which is provided with a lock nut 31.
It is designed to fit in the tool engagement hole of
By rotating the tool 55 through the window 51a of the 51, the lock nut 31 is screwed back and forth.

In this way, the paving slab 10 is lifted by the lifting jack 50, and the lock nut 31 is brought into contact with the top surface of the fixing bracket 27 to stop the downward movement as shown in FIG. 4 (g), and the jack 50 is removed. .

Then, the filling material 33 is injected into the space under the paving slab 10 through the injection hole 32 to complete one lifting operation.

When it is necessary to further increase the height, or when subsidence occurs again and repair is required, the lock nut 31 is removed as shown in FIG. 31 is screwed in again and the above-mentioned fourth
The steps shown in (e) to (g) are repeated to raise the pavement slab 10 again. At this time, since the concrete edging material 1 is fixed to the bottom surface of the pavement plate 10 at the time of the first construction,
Only the paving slab 10 is lifted up without backfilling by the filler 33 injected during the first raising.

(Effects of the invention) As described above, the method for repairing the height of the submerged paving slab of the present invention is to raise only the necessary portion, not to swell the pavement layer on the surface or to revise the entire paving slab, It exists until the construction is completed with the original road surface intact. Moreover, since each work is performed sequentially in a short time,
Even if the pavement surface is repaired using a long concrete pavement with a length of 100 m, it can be repaired without affecting daytime traffic. In addition, the device for lifting work can be attached only when the height needs to be restored at the required time. As for the construction cost of the first pavement, the parts other than concrete edging can be constructed as before, and even when restoring a large area of subsidence, it is not necessary to lift the entire area at the same time, but rather for each small area. It can be lifted, and a limited number of jacks can repair an infinitely large area, and it can be economically repaired at low cost.

Further, since the concrete edging material used in the present invention has the synthetic resin fiber layer integrated on one side of the synthetic resin sheet, the pavement concrete is placed with the synthetic resin fiber layer facing upward. As a result, the synthetic resin fiber is embedded in the concrete and a strong bond is obtained, and even when a filler is injected under the pavement plate during bulk restoration, this and the pavement plate are always cut off, It is now possible to easily carry out repairs due to the degree of difficulty.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an example of a concrete edging material according to the present invention, FIG. 2 is an enlarged cross-sectional view of its use state, and FIG. 3 is a concrete pavement sectional view by a concrete pavement method according to the present invention. (A) to (H) are cross-sectional views of the overheight restoration process, and FIG. 5 is a cross-sectional view showing a state in which the upper jack is mounted. 1 ... Concrete edging material, 2 ... Polypropylene sheet, 3 ... Synthetic resin fiber layer, 4 ... Concrete, 10 ... Concrete pavement plate, 11 ... Pavement foundation ground, 12 ... Foundation roadbed, 13 ... Rebar, 14
…… PC steel, 15 …… Concrete, 21 …… Work hole, 24 …… Reaction plate, 25
…… Excavation surface, 26 …… Jack mounting bracket, 27 …… Fixing bracket, 28 …… Cylindrical part, 29 …… Overhang part, 30 …… Female thread, 31 …… Lock nut, 33
…… Filling material, 50 …… Hakuage jack, 51 …… Ram chair, 51a …… Window, 52 …… Hydraulic cylinder, 53 …… Ram, 54 …… Extension rod.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruo Inukai 3559-17 Akuwa-cho, Seya-ku, Yokohama, Kanagawa Prefecture (72) Inventor Ken Miyauchi 1769-3 Terasaki, Sakura-shi, Chiba (72) Inventor Yukihiro Kawamoto Omiya, Saitama Prefecture 2-744-4, Owada-cho, Yokohama (72) Inventor Kaoru Saeki 3-1-3, Mukaiyama, Nerima-ku, Tokyo (56) References: 3-36006 (Kaikaihei)

Claims (1)

[Claims] 1. A concrete edging material having a synthetic resin fiber layer made of a non-woven fabric or the like fixed integrally on one side of a synthetic resin sheet, with the synthetic resin fiber layer side facing up on the surface of a foundation roadbed for paving. After laying down and arranging the necessary reinforcement on the concrete edging material, cast concrete in place to form a concrete paving slab, and in the subsidence area of the concrete paving slab, the front and back of the concrete paving slab Work holes are formed at regular intervals by penetrating into the base, and the base roadbed under and around the holes is excavated through the work holes to form a working space under the paving slab and a reaction plate is formed at the bottom of the paving slab. Then, a lower end side of each of the working holes is supported at its lower end and a cylindrical jack mounting metal fitting is attached, and a lifting jack is attached to the jack mounting metal fitting, and a reaction force is applied to the reaction plate to obtain the jack. By said conc Over preparative lift the pavement, height restoration process of the concrete pavement made be characterized by filling the filling material in the gap concrete pavement block copy made by lifting it.