JPH0657929B2 - Method for launching submerged concrete pavement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention repairs a partial subsidence of a concrete paved road surface or the like and restores the height of a submerged concrete paving plate for flattening the entire road surface. This is related to the lifting method used for construction.

(Prior Art) Conventionally, a method of repairing a partial subsidence of a concrete pavement has been adopted in which the surface pavement is raised on the pavement surface, so-called overlay, or the entire pavement plate in the subsidence is removed and a new re-punch is performed. .

However, in the case of conventional overlay pavement, the surface of the concrete pavement plate becomes high, so it is often necessary to reconstruct the gutters and curbs, and it is not possible to eliminate the step between the raised and non-raised portions. Therefore, in a place where the step is inconvenient, it is necessary to construct a wide area up to a portion where no subsidence occurs. Further, since the surface concrete is cast, it is necessary to cure the concrete, and there is a problem that traffic must be cut off for a long time.

In addition, the method of rehashing the concrete pavement requires the same cost as the new pavement, and also requires a longer traffic cutoff than the overlay, and when it is necessary to contact the existing part, work is required. Since the space is limited, there are problems such as workability problems.

As a method to solve such a problem, assuming subsidence in advance, at the time of the first pavement plate casting and molding, the lift-up metal fittings are embedded at regular intervals throughout the pavement surface, and the metal fittings at the necessary locations are set. A method of backfilling by attaching a jack and lifting it (Japanese Patent Laid-Open No. 61-169504), or by making a working hole in the subsidence area of a concrete paving slab and attaching a jack to this, flattening the subsidence area. A height restoration method was proposed, in which the height was raised and backfilling was performed.

(Problems to be Solved by the Invention) As described above, a method of embedding metal fittings for uplifting during pavement or opening a work hole after sinking, lifting a pavement slab with a jack and backfilling it to restore the height In, it is necessary to raise the subsidence area without causing cracks in the concrete paving slab, and it is considered that the whole area is raised at the same time. However, airports and subsidence areas such as roads often occur vastly, and in order to raise a large area at the same time, many raising jacks, large operating energy are required, and a huge cost is required. is there.

As described above, the present invention provides a method for restoring the height of a concrete pavement plate by using a jack in such a manner that the concrete pavement plate surface is accurately, quickly, and economically with a small amount of material without damaging the existing concrete pavement plate. The purpose of the present invention is to provide a method for raising a submerged concrete paving slab that can lift a flat surface.

(Means for Solving the Problems) A feature of the method of raising a submerged concrete pavement plate of the present invention that achieves the above-mentioned object is that a large number of raising work holes are arranged in a grid pattern over the entire settling area of the concrete pavement plate. Through the opening of the submerged area, attach each of the submerged jacks to each of the submerged work holes in a certain width range on one edge side of the submerged area to raise the submerged area, and move the area of the submerged jack to move the submerged area. In the method of raising a submerged concrete pavement that raises the entire area to a predetermined height, a certain range of jack mounting area on one edge side of the sinking area is sloped upward on the one side and low on the other side. The upper jack on the lower side of the sloped upper curved surface to move the inclined upper curved surface, and the lower edge of the inclined upper curved surface is settled down. Point in the direction of movement of the inclined curved surface at It is to raise the part between the subsidence inclined surface and the inclined uplift curved surface at the same time until it becomes flat before reaching the uphill subsidence inclined surface area.

(Operation) In general, when the pavement to be restored has a concrete structure, it is damaged when a locally strong bending force is applied.

In the method of the present invention, since the lifting jack is attached to a part of the subsidence area and is partially lifted, a height difference occurs between the already lifted portion and the unsupported portion, but from the end portion. By raising the curved surface so that it has a constant sloped curved surface, the curvature of the concrete pavement plate during the lifting is positively controlled.

In this way, by setting a constant sloped curved surface close to the maximum elastic limit of the concrete paving slab, it is possible to efficiently raise the surface without causing cracks.

On the other hand, in the subsidence area, the central portion is low, and the peripheral portion is often inclined low toward the central portion. Therefore, from the one edge of the subsidence area to the other edge, When a low sloped curved surface is advanced in a state close to the elastic limit of concrete, it will intersect the settling inclined surface where the direction of travel is high, and the curvature of the intersection will exceed the elastic limit. Before the intersection, by raising the portion between the sloped curved surface and the sinked curved surface until it becomes flat, it is possible to lift up while maintaining a curvature close to this within the maximum elastic limit.

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

FIGS. 1A to 1H sequentially show the outline of the repair process. First, the shape of the subsidence area B (shown in FIG. 2) of the concrete paving slab A and the height of each part thereof are measured over the entire area. This measurement is performed by selecting any one of various conventionally used methods such as the level 1 and the scale 2 which are normally used as shown in FIG.

Next, as shown in FIGS. 1B and 2, working holes 3 are formed over the entire subsidence area B. The working hole 3 is formed in a circular shape having a diameter of about 150 m / m by a core removing cutter 4 so as to penetrate from the front surface to the back surface of the concrete paving plate A. The working hole 3 is 4 to 5 m long as shown in FIG.
The openings are arranged in a grid-like arrangement at regular intervals.

After the working holes 3 are opened, as shown in FIG. 1C, the surface portion of the foundation roadbed 5 under and around each working hole 3 is excavated, and the working space 6 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. Next, as shown in FIG. 1 (d), concrete is placed on the bottom surface of the excavation hole to form a reaction plate 7 having a flat surface.

If the strength of the foundation roadbed 5 is sufficient to support the reaction force of the jack, which will be described later, the excavated surface 8 itself may be used as a reaction force plate without placing concrete.

After the reaction board 7 is formed, as shown in FIG. 1 (e) and FIG. 4, the jack mounting metal fitting 10 is installed in the work hole 3 and the fixing metal fitting 11 is installed on the reaction board 7 at the center thereof. .
As shown in FIGS. 3 and 4, the jack mounting metal fitting 10 includes a cylindrical portion 12 positioned in the working hole 3 and the cylindrical portion 12 thereof.
And a projecting portion 13 protruding from the outer periphery of the lower end of the concrete pavement A to the bottom. As shown in FIG. 3, the overhanging portion 13 is composed of a divided piece 13a obtained by dividing the disk into three parts, and of the auxiliary cylinder 14 screwed into the lower end of the cylindrical portion 12 in the working hole space 6 under the paving plate. It is fixed to the flange 14a by a pin 14b, and the upper surface is pressed by the lower end of the cylindrical portion 12 so that the cylindrical portion 12 can be assembled. Fixing bracket 1
1 is formed in a disk shape, and a plurality of sheets 1 are piled up at a height where the upper end of the disk 1 is inserted into the cylindrical portion 12 of the jack mounting metal fitting 10 in a state of being placed on the reaction force disk 7 to form a columnar shape.

The jack fitting 10 has a female screw 15 on the inner surface of the cylindrical portion 12.
Is engraved, and a ring-shaped lock nut 16 having an external thread engraved on the outer periphery thereof is screwed into this. The lock nut 16 is formed to have a size such that the lower end surface of the lock nut 16 is in contact with the upper peripheral edge portion of the fixing metal fitting 11, and the upper end surface of the lock nut 16 is a tool for turning and screwing the same. The engagement hole is opened.

The jack mounting metal fitting 10 and the fixing metal fitting 11 configured as described above are mounted for each work hole 3 to complete the preparatory work. Then, as shown in FIG. And lift up. During the preparatory work described above, a steel lid (not shown) is attached to each work hole 3 when the road surface is used during the daytime. This does not affect the running of the vehicle.

The lifting jack 20 used for lifting work has a cylindrical ram chair having a window 21a in its periphery as shown in FIG. 4, and the lower end of the ram chair 21 is the upper end of the cylindrical portion 12 of the jack mounting bracket 10 described above. It is designed to be screwed into. The outer periphery of the lower end of the hydraulic cylinder 22 is fixed to the upper end of the ram chair 21, and the ram 23 is hydraulically moved in and out of the center of the lower end surface of the hydraulic cylinder 22.
The upper end of a cylindrical steel extension rod 24 is in contact with the tip of the ram 23. The lower end of the extension rod 24 is brought into contact with the upper end of the fixing metal fitting 11 described above, and when the ram 23 is pushed out, the fixing metal fitting 11 is inserted through the extension rod 24.
The upper surface of the stool is pushed and the ram chair 21 is pulled up by the reaction force, and the concrete paving slab A is lifted through the jack fitting 10. On the other hand, a cylindrical nut swivel tool 25 is inserted between the ram chair 21 and the extension rod 24 in a concentric arrangement with them. The nut turning tool 25 has a nut engaging projection 26 projecting from the lower end thereof, which is fitted into the tool engaging hole of the lock nut 16.
The lock nut 16 is screwed back and forth by turning the tool 25 through the window 21a.

Further, an in-and-out rod 27 which reciprocates together with the ram 23 is projected from the upper end of the hydraulic cylinder 22, and an up-and-down amount detecting sensor 28 for measuring the operation amount of the in-and-out rod 27 is provided outside thereof.
Is provided.

At the time of lifting, the lifting jack 20 configured as described above is mounted in parallel from each edge of one side of the subsidence area B in four rows as shown in FIG. Then
As shown in FIG. 6, in consideration of the subsidence area curved surface 30 and the allowable bending amount of the concrete paving slab A, which have been measured previously, several stages of intermediate uplifting curved surfaces, 31a and 31b, and a final stage of uplifting curved surface 31c. Is set in advance, and first, the jack rows 20 _{1 to} 20 ₄ are reached until the intermediate rising curved surface 31a of the first stage is reached.
Operate the jack to stop it. In the same manner, the slope-up curved surface 31c is sequentially lifted from the second stage to the final stage.

Although only the third stage is shown here, the actual planned uplifting curved surface for each stage is set so that the minimum uplifting height is about 0.2 mm.

Then, in the first column of each jack of the jack column 20 _1, by operating the nut turning tool 26 is lowered the lock nut 16, it is brought into contact with the lower end surface to the upper end of the fixing bracket 11. As a result, even if the jack 20 is removed, the concrete paving slab A is supported by the fixture 11. In this state, the jacks 20 in the first row are removed, moved to the fifth row, mounted in the work holes 3, and similarly lifted up in accordance with the intermediate uplifted curved surface of several stages as described above.

The automatic control device shown in FIG. 7 is used for each lifting work. This device has a hydraulic control panel 41 that supplies the same hydraulic pressure from the hydraulic pump 40 to each column. Further, the detection signal from the lifting amount detection sensor 28 of each lifting jack 20 is sent to the displacement meter 42. The displacement meter 42 compares the planned amount corresponding to the curved surface stored in advance with the detected amount from the sensor 28, and outputs an operation signal to the operation panel 43 until the detected amount reaches the planned amount. In the operation panel 43, the solenoid valve for opening and closing the flow path of each hydraulic jack 20 built in the hydraulic control panel is turned on and OF.
It is designed to be F controlled, and the Uegami jack 20
For each row, the solenoid valve is controlled so as to operate in accordance with the control signal from the displacement gauge 42, and at the same time, the lifting speed of each lifting jack in each row is 0. 2 to 0.8 mm is the unit to lift up intermittently,
All the jacks are controlled so that each row is operated by a unit length. Further, a pressure sensor 44 is provided on the hydraulic pressure supply path of all the jacks, and the signal thereof is sent to the load meter 45. The load cell 45 stores the maximum allowable load in advance, compares the maximum allowable load with the load detected by the pressure sensor 44, and sends a control signal to the operation panel to detect the pressure detected by the pressure sensor 44, that is, each pressure sensor. When the load on the upper jack exceeds a certain level, the solenoid valve is closed and the supply of hydraulic pressure is stopped.

In the figure, reference numeral 46 is a computer.

In this manner, the mounting positions of the jacks 20 are sequentially changed in units of rows, and the sloped curved surface 31c is moved toward the other edge of the subsidence area B. Then, after moving to the position in front of the rising subsidence inclined curved surface 30a of the other side edge portion,
The sinking inclined curved surface 30a and the inclined rising curved surface 3
As shown on the left side in FIG. 6, the upper jack rows 20 _{1 to} 20 ₄ are set in the entire area of the concave curved surface portion formed by 1c and all of them are simultaneously operated to flatten the concave curved surface portion. And complete the subsidence area B as a whole.

In the above-mentioned embodiment, as shown in the elevation process diagram of FIG. 8, the elevation is started from the edge (joint) of the concrete pavement A, but the settlement area B is the same concrete pavement A.
If it is inside, as shown in FIG. 9, it starts from one side edge of the subsidence area B and slopes upward toward the other side edge 31.
Move c.

Further, when the settlement is large, as shown in FIG. 10, after raising it by a certain height over the entire settlement area, it is similarly piled up several times over the entire area and raised to a predetermined height.

Further, as shown in FIG. 11, when the subsidence area curved surface of the subsidence area B is a continuous concave curved surface, the bottom is first lifted flat and then the inclined uplifting curved surface 31c is moved to uplift the entire area. The numbers in Fig. 9 to Fig. 11 indicate the order of the raising process. After lifting the entire subsidence area to a predetermined height in this way, the concrete paving slab 1
A filler 32 such as sand or foamed cement mortar is injected into the space formed between the base road base 5 and the base road base 5 through a hose through an injection hole 33 opened separately from the work hole 3 in the previous period, and the jack mounting metal fitting 10 is inserted into the work hole 3. The work hole 3 is covered with the fixing metal fitting 11 left, and the work is completed. It should be noted that this lid may be embedded with concrete, or a removable lid may be used so that it can be used for later re-restoration.

(Effects of the invention) As described above, the method for raising concrete pavement slabs of the present invention is to attach a raising jack to one edge of the subsidence area, partially lift it, and sequentially move it. In addition, at that time, since the predetermined sloped curved surface is sequentially moved, it is possible to carry out the lifting work with a small number of small jacks. When it is moved and lifted, it is designed so that the part between the curved surfaces is flattened before it intersects the subsidence tilted curved surface of the uphill slope. Since it is possible to carry out the construction close to the elastic limit of No. 1, the best work efficiency can be obtained according to the construction site, and it is possible to perform the lifting work safely and promptly.

[Brief description of drawings]

1 (a) to 1 (h) are cross-sectional views showing the steps of the method of the present invention in order, FIG. 2 is a plan view showing the arrangement of working holes formed in the subsidence area, and FIG. Exploded perspective view,
FIG. 4 is a vertical cross-sectional view of the lifting jack installed state, FIG. 5 is a plan view of the lifting jack mounting arrangement, FIG. 6 is a graph showing the lifting process, and FIG. 7 is a block diagram showing the lifting controller. , FIG. 8 to FIG. 11 are diagrams showing different ascending work orders, respectively. A: concrete pavement plate, B: subsidence area, 3 ... work hole, 5 ... foundation roadbed, 6 ... work space under the pavement plate, 7 ... reaction plate, 8 ... excavation surface, 10 ... Jack mounting bracket, 11 ... Fixing bracket, 12 ...
... Cylindrical part, 12a ... Annular groove, 13 ... Overhanging part, 13a ... Dividing piece, 15 ... Female screw, 16 ... Lock nut, 20 ... Hakage jack, 20 _{1 to} 20 ₄ ... Jack Row, 21 ... Ram chair, 22 ... Hydraulic cylinder, 23 ... Ram, 24 ... Extension rod, 25 ... Nut swivel tool, 26 ... Nut engaging projection, 2
7-in / out rod, 28-uplift amount detection sensor, 30-sinking area curved surface, 30a-sinking inclined curved surface, 31a, 31b-intermediate uplifting curved surface, 31c-inclined uplifting curved surface, 32- Filling material, 33 ... injection hole, 40 ... hydraulic pump, 41 ... control panel, 42 ... displacement meter, 43 ... operation panel, 44 ... pressure sensor, 45 ... load cell.

Claims (1)

[Claims] 1. A concrete paving slab is provided with a grid-like arrangement of a plurality of uplifting work holes all over the subsidence region, and each of the uplifting work holes of a certain area on one edge side of the subsidence region is raised. In the method of lifting a submerged concrete pavement, one side of the subsided area is used to lift up by mounting the upper jack, and move the area where the upper jack is installed to lift up the entire subsided area to a predetermined height. The jack mounting area of a certain range is raised to the sloped curved surface where the one edge side is high and the other edge side is low,
The upper jack on the higher side is sequentially re-installed on the upper portion on the lower side to move the inclined up curved surface, and the edge on the low side of the inclined up curved surface is the inclined up in the subsidence area. Settled concrete pavement characterized in that the portion between the sinking inclined surface and the inclined uplifting curved surface is simultaneously lifted up to be flat before facing the direction of the curved surface moving direction and reaching the uphill settling inclined surface area. How to raise the plate.