JP2990412B2 - Concrete paving plate lifting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete paving slab lifting device for lifting a concrete paving slab constructed mainly on a road or an airport, mainly for the purpose of partial subsidence restoration.

[0002]

2. Description of the Related Art Generally, a paving slab such as a road or a runway constructed on soft ground is partially settled with time. As a method of repairing such settlement, a number of working holes for jack installation are made at regular intervals in the settlement part of the pavement plate, and a reaction plate is constructed under the working holes, and a cylindrical shape is formed in the working holes. Attach the lifting hardware and fix the tip of the ram chair supported on the jack body side of the lifting jack to the metal fitting,
A method has been developed in which an extension rod pushed out of a jack body is supported by a reaction board, a lifting jack is mounted, and a pavement plate is lifted by pushing out the extension rod by hydraulic pressure (Japanese Patent Laid-Open No. 29090/1990).
No. 3, JP-A-1-318604).

Further, in this type of method, a technique has been developed in which a large number of lifting jacks are used, and the settlement is repaired while controlling them stepwise by computer control (Japanese Patent Application Laid-Open No. 2-289704). .

[0004]

In the conventional method described above, when the method is applied to a wide range of subsidence, a partial lifting operation is performed using several tens of jacks, and the lifting operation is performed while moving the lifting operation. Although the entire height is restored, the conventional device that implements this method is to screw the ram chair to the lifting hardware fixed to the jack mounting work hole, so that the jack It is necessary to turn the entire jack several times to attach and remove, so each time the hydraulic hose and control cable must be removed, the work efficiency is poor, and operating oil is lost when attaching and detaching the hydraulic hose. There are problems such as loss due to leakage and soiling of the pavement plate surface.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a concrete paving slab lifting device in which a jack can be easily attached and detached without attaching and detaching a hydraulic hose and a cable.

[0006]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
Lifting hardware attached to the work hole for jack installation drilled on the concrete paving slab, a reaction board provided below the work hole,
A concrete paving slab lifting device comprising a reaction plate supporting a downward load of an extension rod and a jack for supporting the upward load of the jack body on the lifting device, wherein the lifting device has an upper end. And the lower end of the ram chair of the jack, a male fitting and a female fitting that fit each other,
The male fitting is provided with a plurality of locking projections in the radial direction, and the female fitting is provided with a vertical groove portion into which the locking projection is inserted in the axial direction, and a depth of the vertical groove portion. A projection locking groove having a lateral groove portion continuous with the portion is provided.

[0007]

When the jack is mounted, the concrete pavement lifting device aligns the male and female hardware of the ram chair and the lifting hardware with each other, and inserts the locking projection into the vertical groove of the projection engaging groove. By rotating the ram chair, the locking projections enter the lateral groove portions, and are prevented from coming off in the axial direction.

In this state, by pushing out the extension rod of the jack and pressing the reaction plate, the concrete paving slab is lifted through the ram chair and the lifting hardware.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 shows a lifting device used in the method of the present invention. In FIG. 1, 1 is a concrete paving slab to be lifted, 2 is a working hole formed through the paving slab through the front and back, 3a is a roadbed, 4 is a reaction board formed on the roadbed, 5 is a reaction board. Numerals 10 denote piled-up reaction receiving brackets, and reference numeral 10 denotes a lifting bracket housed in the work hole 2. This metal fitting 10 is the cylinder body 1
1 and an auxiliary cylinder 12 and three concrete plate support pieces 13 screwed to the lower end thereof.

The cylinder body 11 has a female screw 14 formed on the inner surface. A flange 15 having an outer diameter substantially equal to the outer diameter of the cylinder main body 11 is formed on the outer periphery of the lower end of the auxiliary cylinder 12, and a male screw 16 screwed into the female screw 14 of the cylinder main body 11 is engraved on the other end side of the flange 15. Have been.

On the upper surface of the flange 15, a number of pins 17, 17...

As shown in FIG. 2, each of the concrete slab support pieces 13 has a shape obtained by dividing a ring-shaped disk into many parts, and is assembled into the auxiliary cylinder 12 so that the whole becomes a disk shape. . The locking holes 18, 18,... Into which the pins 17, 17,.

The metal fitting 10 inserts three concrete slab support pieces 13 separately through the working holes 2 formed in the concrete paving slab 1, and inserts the auxiliary cylinder 12 in the working space 3 into the disk 15 on the flange 15. And the engaging hole 18 is fitted to the pin 17. Next, the cylinder main body 11 is connected to the auxiliary cylinder 12.
And presses the upper surface of the concrete slab support piece 13 at the lower end thereof to sandwich it between the upper surface of the flange 15 and
The whole is designed to be integrated.

A lifting jack 20 is mounted between the metal fitting 10 and the reaction force receiving metal fitting 5. The lifting jack 20 has a cylindrical ram chair 21 having a window 21 a around the periphery thereof, and the lower end of the ram chair 21 is connected to the upper end of the cylindrical body 11 of the fitting 10 via a cylindrical connecting adapter 40. Have been.

The adapter 40 includes a male fitting 41 screwed into the ram chair 21 and a female fitting 42 screwed into the upper end of the cylinder body 11.
It is composed of As shown in FIGS. 4 and 5, the male fitting 41 has four locking projections 43, 4 arranged radially around the lower end.
3 are integrally provided. The female fitting 42 has an axial vertical groove 44a in which the locking projections 43 are fitted on the inner surface on the upper end side thereof, and a lateral groove 44b circumferentially continuous with the depth of the vertical groove 44a. A projection engaging groove 44 made of
Are aligned with the vertical groove 44a of the female fitting 42, and are moved in the axial direction. Then, the male fitting 41 is turned, and the locking projection 43 is inserted into the lateral groove 44b, so that both fittings 43 cannot be moved in the axial direction. To be engaged.

The upper end of the ram chair 21 has a hydraulic cylinder 2
The outer periphery of the lower end of the hydraulic cylinder 2 is fixed, and the ram 23 is moved in and out of the center of the lower end surface of the hydraulic cylinder 22 by hydraulic pressure. The upper end of a cylindrical steel extension rod 24 is in contact with the tip of the ram 23. The extension rod 24 has its lower end in contact with the upper end of the above-described reaction receiving metal fitting 5, and the ram 23 is pushed out so that the metal fitting 5 can be extended through the extension rod 24.
Is pressed, the ram chair 21 is lifted by the reaction force, and the paving slab 1 is lifted via the metal fitting 10.

On the other hand, between the ram chair 21 and the extension rod 24, a cylindrical nut turning tool 25 is inserted concentrically with these. The nut turning tool 25 is provided with a nut engaging projection projecting from the lower end thereof so as to be fitted into the tool engaging hole of the lock nut 26, so that the tool 25 can be turned from the window 21 a of the ram chair 21. Thereby, the lock nut 26 is advanced and retracted.

A ram 2 is provided at the upper end of the hydraulic cylinder 22.
An entry / exit rod 27 reciprocating with the projection 3 is protruded, and a lifting amount detection sensor 28 composed of a rotary encoder for measuring the operation amount of the entry / exit rod 27 is provided outside the rod 27.

The lifting jack 20 is operated by a dedicated jack driving device 30. The jack driving device 30 includes a hydraulic unit 32 mounted on a handcart 31 and a jack for controlling the hydraulic unit 32. And a control CPU 33.

The lifting jack 20 is attached to the wheelbarrow 31 by the lifting device 3.
4 to be suspended and supported.

Further, the jack control CPU 33 communicates with and is controlled by a separately provided central control computer device 35.

In the apparatus constructed as described above, the metal fittings 41 and 42 of the adapter 40 are fixed to the ram chair 21 and the lifting metal fitting 10 in advance, and the lifting jack 20 is connected to the lifting gear 34.
The lifting jack 20 is attached to the lifting metal fitting 10 by engaging the two metal fittings 41 and 42 in a state where the lifting metal fitting 10 is suspended.

In this state, the extension rod 24 is pushed out by operating the hydraulic cylinder 22. As a result, a reaction force is applied to the reaction force plate 4 via the reaction force receiving metal member 5, and the pavement plate 1 is lifted. After being lifted to a predetermined height in this manner, the nut turning tool 25 is used to lock the lock nut 26.
Is turned, and this is brought into contact with the upper surface of the reaction force receiving bracket 5. Thus, the lifting state of the paving slab 1 is maintained, the hydraulic cylinder 22 is returned, and the lifting jack 20 is removed.

The connecting adapter may have the structure shown in FIG. 8 in addition to the above. This is a female bracket 4 on the ram chair 21 side
2 and the male fitting 41 is bolted to the lifting fitting 10 side.
The joint surface between the locking projection 43 of the male fitting 41 and the lateral groove 44b of the female fitting 42 is tapered.

In each of the above-described embodiments, the adapter 40 is formed separately from the ram chair and the lifting hardware. In addition, the male and female hardware are connected to the ram chair 21 and the lifting hardware 10. It may be one integrally formed with.

[0027]

As described above, according to the apparatus of the present invention, the mounting and dismounting of the ram chair with respect to the lifting hardware is performed by a male fitting having a locking projection in the radial direction, and a vertical groove and a lateral groove in which the locking projection is fitted. The lifting jack can be attached and detached with a slight swing by fitting with a female fitting having an engaging groove having a groove. It is easily removable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of an embodiment of the apparatus according to the present invention.

FIG. 2 is a plan view showing a lifting metal part of the same.

FIG. 3 is a cross-sectional view showing an adapter part according to the first embodiment.

FIG. 4 is a bottom view of a male metal fitting of the adapter.

FIG. 5 is a front view of a male fitting of the adapter.

FIG. 6 is a plan view of a female fitting of the adapter according to the first embodiment.

FIG. 7 is a sectional view taken along the line AA in FIG.

FIG. 8 is a sectional view showing another embodiment of the adapter in the device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete paving slab 2 Work hole 3 Work space 3a Roadbed 4 Reaction board 5 Reaction force receiving bracket 10 Concrete plate lifting hardware 11 Cylinder main body 12 Auxiliary cylinder 13 Concrete plate support piece 14 Female screw 15 Flange 16 Male screw 17 Pin 18 Lock Hole 20 Lifting jack 21 Ram chair 21a Window 22 Hydraulic cylinder 23 Ram 24 Extension rod 25 Tool 26 Lock nut 27 Entry / exit rod 28 Lifting amount detecting sensor 30 Jack driving device 31 Hand truck 32 Hydraulic unit 33 Jack control CPU 34 Hanging tool 35 Central control computer device 40 Adapter 41 Male fitting 42 Female fitting 43 Locking projection 44 Projection engaging groove 44a Vertical groove section 44b Horizontal groove section 45 Bolt

Claims (1)

(57) [Claims] 1. A lifting hardware attached to a jack mounting hole drilled in a concrete pavement slab, a reaction plate provided below the work hole, and a downward load supported by the extension rod on the reaction plate. And a jack for supporting the upward load on the jack body side with the lifting hardware, wherein the male fitting with the upper end of the lifting hardware and the lower end of the ram chair of the jack mutually fits. A metal fitting and a female fitting are provided integrally or integrally, and the male fitting is provided with a plurality of locking projections directed in the radial direction, and the female fitting has the locking projection inserted in the axial direction. A concrete paving slab lifting device comprising a projection locking groove having a groove portion and a horizontal groove portion continuous with a deep portion of the vertical groove portion.