GB2278101A

GB2278101A - Method and device for raising subsided concrete pavement

Info

Publication number: GB2278101A
Application number: GB9408848A
Authority: GB
Inventors: Haruo Inukai; Shigeo Shirane
Original assignee: Ox Jack Consultant & Co Ltd; PS Co Ltd
Current assignee: Ox Jack Consultant & Co Ltd; PS Co Ltd
Priority date: 1993-05-20
Filing date: 1994-05-04
Publication date: 1994-11-23
Anticipated expiration: 2014-05-04
Also published as: JPH06330506A; JPH0745722B2; CN1102679A; GB2278101B; GB9408848D0

Abstract

In a method for raising a subsided concrete pavement by use of jacks, the paved road surface can be speedily and completely flattened with accuracy without inflicting any damage to the existent pavement, by forming working holes (2) in the pavement (1) at intervals, setting lifting jacks (20) into the respective working holes (2), measuring desired heights and by use of a jack controlling CPU (33) and a central control computer unit (35), determining objective values for raising the respective bored portions in accordance with the desired heights thus measured, preparing lifting data obtained by dividing the objective raising values into height values of the same number respectively, inputting the divided lifting data to the central control computer unit, transferring the divided lifting data from the central control computer unit to the jack controlling CPU (33) one by one, operating the jack controlling CPU in accordance with the divided lifting data fed one by one to drive the respective lifting jacks (20), issuing an end-of-operation signal to the central control computer unit (35) when the lifting jack is driven by one of the divided lifting data, giving subsequent ones of the divided lifting data from the central control computer unit (35) to the jack controlling CPU (33), and repeating the processes for driving the lifting jacks (20) by each of the divided lifting data in the same manner as described above. <IMAGE>

Description

METHOD AND DEVICE FOR RAISING CONCRETE PAVEMENTS SUBSIDED This invention relates to a method for raising a concrete pavement which are depressed due to subsidence of ground or other causes in order to level the road surface paved with the concrete pavement.

As the methods for restoring concrete pavements such as a concrete slab partially depressed to the flat road surface, there have been known the so-called "overlay" road repairing method in which the depressed portion in the pavement surface is filled up with paving materials, and a digging method for making a pavement surface flat by removing the pavement which is subsided, and then, doing over again concrete depositing on the depressed portion of the ground.

Another method has been proposed in which hooks are beforehand set onto the pavements laid on the ground at regular intervals over the pavement surface, so that the pavements being depressed can be raised when restoration is required, on the supposition of subsidence of the ground which will be possibly caused some day in the future. (Japanese Patent Appln. Public Disclosure No. SHO 61-169504) However, the aforenoted overlay road repa-iring method entails a disadvantage such that, since the level through the whole area of the pavement surface on the ground is increased, side gutters and kerbstones must be often repaired so as to be raised.Moreover, because of difference in level on the road which is formed as the result of raising the pavement surface, not only the depressed portion but also the existent portion which in itself has no need to be repaired become in need of being repaired so as to make the whole pavement surface flat.

In addition, due to the necessity of concreting the pavements on the ground, the concrete laid on the ground must be cured for a long time causing inconvenient roadblocking.

The road repairing according to the aforenoted digging method requiring newly concrete depositing on the ground will cost a great deal as much as new pavement work is executed, and consume much time in need of blockading traffic, compared with the overlay road repairing method described above. Besides, this digging method is disadvantageous in that the road repairing work requiring construction for joining a repaired portion with a non-repaired portion cannot be executed with a high efficiency at a limited field of work.

The method for previously setting the hooks in the pavements as touched upon above has suffered a disadvantage such that the expenses for providing all the pavements with the hooks run up, because the hooks are set also onto the pavements which may not subside.

To solve the problem raised in the method of setting the hooks beforehand, a road repairing method has been developed in which a concrete pavement panel subsided is bored to form a working hole into which a jack is attached to lift up the pavement panel, and then, the space between the pavement panel thus lifted up and the ground is filled with a repairing filler. (Japanese Patent Appln. Public Disclosure No. HEI 1-318606) An object of the present invention is to provide a method capable of readily raising concrete pavements subsided by use of a jack so as to speedily and completely flatten the paved road surface with accuracy without inflicting any injury to the existent pavements.

To attain the object described above according to the present invention, there is provided a method for raising concrete pavements subsided, wherein a depressed part of the pavements subsided is bored to form a number of working holes at intervals, and lifting jacks are set into the respective working holes, which is characterised by measuring desired heights to which the bored portions having the working holes should be raised by use of a microprocessor for controlling the respective lifting jacks (hereinafter, referred to as "jack controlling CPU") and a central control computer unit for communicating with all the lifting jacks, determining objective values requiring for raising the respective bored portions at which the working holes are formed in accordance with the desired heights thus measured, preparing lifting data obtained by dividing the objective raising values into height values of the same number respectively, inputting the divided lifting data to the aforesaid central control computer unit, transferring the divided lifting data to the jack controlling CPU from the central control computer unit one by one, operating the jack controlling CPU in accordance with the divided lifting data fed one by one to drive the respective lifting jacks, issuing an end-of-operation signal to the central control computer unit when the lifting jack is driven by one of the divided lifting data, giving subsequent one of the divided lifting data from the aforesaid central control computer unit to the jack controlling CPU, and repeating the processes for driving the lifting jacks by each of the divided lifting data in the same manner as described above.In a device comprising lifting jacks to be placed between a concrete pavement panel in which working holes are formed and a reaction base disposed under the pavement panel for raising the concrete pavement panel, a hydraulic unit for driving the lifting jacks, and a jack controlling CPU for controlling the hydraulic unit, the device according to the present invention for raising the concrete pavement panel subsided is characterised in that every lifting jack is provided with the aforesaid hydraulic unit and jack controlling CPU, and a central control computer unit is provided for controlling the jack controlling CPU.

An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings, in which: FIG. 1 is a longitudinal sectional view showing one embodiment of the device according to this invention, FIG. 2 is a bottom view showing a reaction receiving member used in the device of the invention, FIG. 3 is a plan view showing the state in which working holes are formed in this invention, FIG. 4 is a plan view showing a lifting jack and its wiring used in the device of this invention, FIG. 5 is a sectional view showing the manner in which pavement repairing work is performed according to the method of this invention, and FIG. 6 is a flowchart of the pavement repairing work according to this invention.

In FIG. 1 illustrating a device for raising pavements for practicing the method of the present invention, reference numeral 1 denotes a concrete pavement panel such as a concrete slab to be raised, 2 denotes a working hole formed through the pavement panel, 3 denotes a roadbed, 4 denotes a reaction base disposed on the roadbed, 5 denotes a reaction receiving member placed on the reaction base, and 10 denotes a concrete panel lifting member fitted into the working hole 2. The concrete panel lifting member 10 comprises a cylinder body 11, an auxiliary cylinder 12 screwed to the lower end of the cylinder body, and three concrete panel supporting pieces 13.

The cylinder body 11 is provided in its inner surface with a female screw 14. From the lower end of the auxiliary cylinder 12, a flange 15 extends radially, having the same diameter as the cylinder body 11. The flange 15 has a male screw 16 to be engaged with the female screw 14 of the cylinder body 11.

On the upper surface of the flange 15, there are formed a plurality of pins 17 for catching the concrete panel supporting pieces 13.

The concrete panel supporting pieces 13 each formed in an arc are arranged circularly so as to form a ring when assembled to the auxiliary cylinder 12 as shown in FIG. 2.

The concrete panel supporting piece 13 has engaging holes 18 for receiving the pins 17.

The three concrete panel supporting pieces 13 are introduced one by one into a working space 3a through the working hole 2. The concrete panel lifting member 10 is adapted to assemble the three concrete panel supporting pieces 13 in a ring on the flange 15 around the auxiliary cylinder 12 in such a state that the pins 17 are fitted into the engaging holes 18. Then, the auxiliary cylinder 12 is screwed into the cylinder body 11 so as to forcibly place the concrete panel supporting pieces 13 between the flange 15 and the concrete panel. Thus, all the elements are united substantially in one body.

Between the member 10 and the reaction receiving member 5, a lifting jack 20 is located. The lifting jack 20 has a cylindrical ram chair 21 with a window 21a. The ram chair 21 is screwed at its lower end portion to the upper portion of the cylinder 11 of the aforesaid member 10. On the upper end portion of the ram chair 21, a hydraulic cylinder 22 is fixedly retained so as to permit reciprocating motion of a ram 23 in the lower center part of the hydraulic cylinder 22. The leading end of the ram 23 comes in contact with the upper end of a steel extension rod 24. By thrusting the ram 23 outward, the extension rod 24 is forced against the upper end of the member 5 to push up the ram chair 21 by the reaction force, consequently to raise the pavement panel 1 by the member 10. Between the ram chair 21 and the extension rod 24, a cylindrical nut rotating member 25 is placed coaxially.The nut rotating member 25 is provided on its lower surface with nut engaging protrusions to be fitted into engaging holes formed in a lock nut 26, so as to move the lock nut 26 longitudinally by operating the member 25 through the window 21a formed in the ram chair 21.

From the upper end of the hydraulic cylinder 22, a reciprocating rod 27 which reciprocates together with the ram 23 extends longitudinally. Near the reciprocating rod 27, there is disposed a raising amount detecting sensor 28 having a rotary encoder for measuring the longitudinal movement of the reciprocating rod 27.

The lifting jack 20 is driven by a jack driving device 30 exclusively used for the lifting jack. The jack driving device 30 has a hydraulic unit 32 mounted on a handcart 31 and a jack controlling CPU 33.

The lifting jack 20 is supported as hung from the handcart 31 by use of hanging means 34.

The jack controlling CPU 33 is connected to and controlled by a central control computer unit 35.

The method for raising pavements by use of the aforenoted device according to this invention will be described hereinbelow with reference to the flowchart shown in FIG. 6.

(1) First, a depressed portion A of a concrete pavement panel 1 as laid on a runway or the like is bored to form working holes 2 as shown in FIG. 3.

(2) The surface heights where the working holes 2 for use in one repairing work are formed in the pavement panel 1 to be raised are measured by use of a laser level meter or laser staff (not shown) to obtain the present height data (Process "a" in FIG. 6). As one example, three lines each having 18 working holes, i.e. 54 holes in total, may be formed in the pavement panel for one repairing work.

(3) Next, the lifting jack 20 is fitted into each working hole as shown in FIG. 1, and the jack controlling CPU 33 provided for each lifting jack 20 is connected to the central control computer unit 35 by use of a wire cable as shown in FIG. 4 (Process b" in FIG. 6).

(4) The height to which the pavement subsided should be raised in one lifting operation is calculated for each bored portion in which the working hole 2 is formed for receiving the lifting jack 20 on the basis of the height data predetermined as mentioned above. Simultaneously, the manner of raising the pavement subsided is determined for one lifting operation (Process "c" in FIG. 6).

(5) Next, objective values according to which the pavement subsided can be raised in safety in one lifting operation are prepared for the respective working holes 2 from the present height data. Then, all the objective values are divided into height values of the same number.

For instance, each objective value may be preferably divided into five to obtain first to fifth divided lifting data (Process "d" in FIG. 6). For example, these divided lifting data are recorded onto a floppy disk to make provision for the next pavement raising work.

(6) The aforementioned divided lifting data stored onto the floppy disk are inputted to the central control computer unit 35 (Process "e" in FIG. 6). From the central control computer unit 35, data for operating the lifting jacks by an amount prescribed by the first divided lifting data are given to the respective jack controlling CPUs 33 (Process "f" in FIG. 6).

(7) Each jack controlling CPU 33 operate the hydraulic unit 32 in accordance with data fed from the central control computer unit to drive the lifting jack 20 by the amount prescribed by the first divided lifting data (Process "g" in FIG. 6). At that time, load data and the end-of-operation signal are given to the central control computer unit 35 (Process "h" in FIG. 6). The data fed from the respective jack controlling CPUs 33 are successively recorded and displayed by the central control computer unit 35.

(8) Upon issuance of the end-of-operation signals from all the jack controlling CPUs 33, the second divided lifting data are outputted, so that the lifting jacks perform the second lifting operation under the control of the jack controlling CPUs 33 while feeding the load data to the jack controlling CUPs until the end-of-operation signal issues.

One pavement raising work is completed upon repeating the above processes from the first lifting operation to the fifth lifting operation.

(9) Each time the pavement raising work is completed, the required number of the lifting jacks are moved to be fitted into other set of working holes 20. In the same manner as above, the surface heights where the working holes are formed in the pavement are measured and the aforementioned processes (4)~ (8) are repeated. Thus, the pavement raising work are carried out all over the pavements subsided.

If the pavement subjected to the raising work as noted above is not raised to the desired height, the same pavement raising work may be carried out once more. That is, one pavement raising work may be preferably parted into two steps in which1 as illustrated in FIG. 5 as one example, the portions ( within the area subsided are first disposed1 and then the portions ( ~ t are disposed, so that the whole area laid with pavements is finally levelled up to the desired height.

As is apparent from the foregoing, according to the method and device of the present invention in which the lifting jacks are driven under the control of the respective jack controlling computer units in accordance with the lifting data into which the objective values calculated from the present heights at the respective working holes are divided, pavement raising work can be carried out in safety with high efficiency and managed completely.

Furthermore, since the device of this invention including the jack controlling CPU and hydraulic unit is movable for each jack, work of arranging hydraulic pipes for each jack is unnecessary to permit a significant improvement in the efficiency of work involved in raising the pavements subsided.

Claims

CLAIMS:

1. A method for raising subsided concrete pavements wherein a depressed part of the subsided pavements is bored to form a number of working holes at intervals, and lifting jacks are set into the respective working holes, characterised by the steps of measuring desired heights to which the bored portions having the working holes should be raised, providing a jack controlling CPU for controlling each lifting jack and a central control computer unit for communicating with all the CPUs of the lifting jacks, determining objective values for raising the respective bored portions at which the working holes are formed in accordance with the desired heights thus measured, preparing lifting data obtained by dividing the objective raising values into height values of the same number respectively, inputting the divided lifting data to said central computer unit, transferring the divided lifting data from the central control computer unit to the jack controlling CPUs one by one, operating the jack controlling CPUs in accordance with the divided lifting data fed one by one to drive the respective lifting jacks, issuing an endof-operation signal to the central control computer unit when the lifting jack is driven by one of the divided lifting data, giving subsequent one of the divided lifting data from said central control computer unit to the jack controlling CPU, and repeating the processes for driving the lifting jacks by each of the divided lifting data.

2. A device for raising subsided concrete pavements, which comprises lifting jacks to be placed in working holes formed in the concrete pavement to engage a) reaction base disposed under the pavement for raising the concrete pavement, a hydraulic unit for driving each of the lifting jacks, a jack controlling CPU for controlling each hydraulic unit, and a central control computer unit arranged to control all of the jack controlling CPUs of the individual jacks.

3. A method as claimed in Claim 1 substantially as described herein with reference to the accompanying drawings.

4. A device as claimed in Claim 2, substantially as described herein with reference to the accompanying drawings.