JP2595466B2 - Manhole cover frame removal equipment and removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for removing a manhole cover frame.

[0002]

2. Description of the Related Art In recent years, the traffic volume on roads has been increasing, but accompanying this, the manhole iron cover frames for sewage, rainwater, electric power, telephones, etc. installed on roadways have been remarkably worn and damaged. A considerable number of iron lid frames have been replaced.

[0003] Conventionally, when replacing an iron lid frame, the surrounding pavement surface was cut vertically by a concrete cutter and then replaced by a compressor, a concrete breaker, or the like, so that the noise was extremely intense and complaints from local residents were complained. However, in order to solve the drawback that the construction work is performed at night, especially on narrow roads, and it is difficult for the residents to cooperate with the construction work.

One of a plurality of radially arranged jacks is attached to a center block by bolts, and the other is supported by the other joint of adjacent jacks by bolting through a fixing band, and is provided with a telescopic tip of each jack. Using a manhole cover frame removal device with a wedge material attached via a jack head to

A cutting groove is formed vertically around the manhole cover frame with a concrete cutter or the like to a depth at which the manhole cover frame replacement member is buried, and a boundary between the manhole cover frame replacement member and the manhole body is formed in a horizontal concave shape. To form a hanging recess,

[0006] The removal tool is held in the hanging recess so that the tip of the wedge member is in contact with the wedge member, and the wedge member is made to enter in the radial direction to induce a horizontal crack from the hanging recess, and the crack reaches the bottom of the previously formed cutting groove. There is known a method of removing a manhole cover frame in which the entry of a wedge member is stopped when the wedge member is moved (Japanese Patent Publication No. 6-10376).

However, in such a detaching device, when the bracing is weak, the stress is concentrated, and the wedge material enters the weak portion, and as a result, the crack becomes incomplete and many post-operations are required. Disadvantage.

Therefore, as an improvement, as shown in FIGS. 2 and 3, the hydraulic jacks 21, 22, 23, 24 are fixed to a substantially rectangular plate 25 by U bolts 26 so as to form a cross on a plane. One of the hydraulic jacks is fixedly abutted on the center block 27, is stably supported by the U bolt 26 near the end of the plate 25, and the jacks 21, 22, 23, and 24 have the jack head 28 at the tip thereof. A wedge member 29 is attached, each hydraulic jack is operated by an electric or manual hydraulic pump, and the plate 25 is composed of a steel plate and an angle 25a, and penetrates the other end of the hydraulic jack into a rising portion of the angle 25a. A hole is formed, and the plate body 25 allows the hydraulic jack to move in a balanced manner with respect to other jacks even when driven simultaneously. The stopper 31 for maintaining the balance of the entry of the jack tip widens the head of the bolt, the other end is fixed to the rising portion of the angle 25a, and the position of the tip of the stopper 31 is fixed by the nut 31a. A device configured to perform adjustment is known (Japanese Patent Application Laid-Open No. 62-50527).

Therefore, when the wedge member 29 is further pushed in by the operation of the hydraulic pump (not shown), the strength between the top of the sloping wall of the manhole and the adjusting ring may not be constant. Although only the jack may advance too much, by setting each stopper 31 to a fixed length, the stopper 31 comes into contact with the inner wall of the adjustment ring of the manhole, so that the other jacks enter without bias. Thus, the crack advances in the horizontal direction with low noise in the direction in which the wedge member 29 enters, and reaches the previously formed cutter location.

[0010] However, although the above disadvantages are solved,
Since the strength of the angle 25a is not sufficient, when the resistance of the wedge member 29 is large, it may be deformed.
Because 1 is a screw-in adjustment structure, it takes a lot of time to install it in the manhole, the operating rate decreases, and when the installation position of the removal tool is relatively deep, the worker leans out and adjusts the screw. There is a risk of work-related injuries.

[0011]

SUMMARY OF THE INVENTION In view of the above, the present invention employs a hydraulic cylinder jack as a driving means for adjusting the expansion and contraction of a stopper, and eliminates the deformation caused by the use of an angle. The main object is to propose a manhole removing device and a removing method that ensure the property.

It is a second object of the present invention to propose a manhole removing tool which can quickly respond to various shapes of the inner diameter of the manhole because the contact position of the stopper varies depending on the shape of the manhole. .

It is a third object of the present invention to provide a manhole cover frame removing device capable of promptly correcting a shift in center position due to a difference in penetration resistance in a direction other than a direction in which a wedge member enters. And

It is a fourth object of the present invention to propose a manhole cover frame removing device in which the length of a hydraulic cylinder jack can be changed as needed according to the size of a manhole.

[0015]

[Means for Solving the Problems]

1. A device for removing a manhole cover frame in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially arranged on a substrate, and the opposite end face of each hydraulic jack is in contact with a center block.

2. In a manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially arranged, the hydraulic jack for the stopper is flush with the hydraulic jack for the wedge member mounted and fixed on one surface of the substrate. Position and fixed to the wedge hydraulic jacks, the end faces of the hydraulic jacks opposite to the expansion and contraction contact the center block, and the center block is a polygonal or circular manhole cover frame removal device corresponding to the number of wedge hydraulic jacks .

3. In a manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially disposed, the hydraulic jack for a stopper is differently positioned on a plane relative to the hydraulic jack for a wedge member mounted and fixed on a substrate. It is fixed so that it does not coincide with the center of height of the hydraulic jack for lumber. The opposite end face of each hydraulic jack expands and contracts against the center block, and the center block corresponds to the total number of hydraulic jacks for wedge members and hydraulic jacks for wedge members. A polygonal or circular manhole cover frame removal tool.

4. In a manhole cover frame removal device in which a wedge hydraulic jack and a stopper hydraulic jack are radially arranged, the stopper hydraulic jack is placed on the lower side of the board with respect to the wedge hydraulic jack placed and fixed on the upper side of the board. , And the opposite end face of each hydraulic jack expands and contracts against the center block, and the center block is a polygonal or circular manhole cover frame removal device corresponding to the total number of hydraulic jacks for wedge members and hydraulic jacks for wedge members. .

5. A wedge-type hydraulic jack and a stopper hydraulic jack mounted and fixed on a substrate are detachable fixtures for manhole cover frames fixed to the substrate with U-bolts.

6. A groove is formed in the vertical direction around the manhole cover frame, a hanging recess is formed in the horizontal direction at the removal position, a hydraulic jack for wedge material and a hydraulic jack for stopper are arranged on the board in the radial direction, and the On the opposite end face, the tip of the wedge material of the removal tool that abuts the center block is held in the recess, and the wedge material is made to enter in the radial direction to induce cracks and stop the wedge material when the cracks reach the groove. How to remove the manhole cover frame.

[0021]

FIG. 1 is a plan view showing an example of a detaching device suitable for use in the method of the present invention. Reference numeral 1 denotes a hydraulic jack for a wedge member, and each of the four hydraulic jacks 1 is fixed with a U-bolt 3 so that one of the four hydraulic jacks 1 is in contact with a center block 2 having a rectangular cross section. The hydraulic jack 1 is integrally fixed with the U-bolt 3 so as to be in contact with the center block 2. In the following description, the hydraulic jack includes a hydraulic cylinder. A wedge member 6 is attached to a tip of each hydraulic jack 1 via a jack head 5, and a stopper 8 is attached to a tip of a piston of each hydraulic jack 2. The hydraulic jacks 1 and 4 are operated by a powered or manual hydraulic pump. Each of the hydraulic jacks 1 and 4 is radially fixed to the board 9 with U bolts 3. A hole for U-bolt penetration is formed in the substrate 9. Since each hydraulic jack is replaceable, it can be replaced with one having a length that can be appropriately expanded or contracted according to the size of the manhole. In addition, even if the cross-sectional shape of the center block 2 is not only polygonal but also circular, one end of each hydraulic jack will come into contact, and the same action will be performed.

As shown in FIGS. 5 and 8, the hydraulic jack 1 for the wedge member and the hydraulic jack 4 for the stopper coincide with the outer shape of the jack as shown in FIGS. 10 are available. As another example, as shown in FIG. 4, it may be fixed by welding.

Next, an example of the method of the present invention will be described. First, the periphery of the existing manhole iron cover frame is cut and excavated in a circular or rectangular shape using a concrete cutter or the like in the vertical direction up to the separation point. This work is preferably performed during the daytime. Then, as shown in FIG.
The wedge member 9 is previously placed in a concave shape so that the wedge member 9 does not shift about 1 cm in the lateral direction between the 0 slope wall top 12 and the portion 13 to be removed by human power in advance.

Thereafter, the detaching device is hung by a unic or the like (not shown) at night, while being kept horizontal, inserted into the manhole 20, and set so that the wedge member 6 is positioned in the hanging recess. When the setting is completed, the wedge member is further pushed in by operating a hydraulic pump (not shown) or manually. In this case, since the opposite ends of the hydraulic jacks 1 for wedges are supported by the center block 2, the approach angles do not shift.

[0025] By this pushing, the crack advances from the hanging recess in the horizontal direction with low noise, and reaches the previously formed cutter location. This is because the portion between the adjustment ring 15 located at the lowermost portion of the detached portion and the inclined wall 12 of the manhole is usually prime-coated and has relatively low strength. As a result, the slope 12
The replacement part (adjustment ring 15, adjustment brick 16, iron lid frame 17, asphalt pavement part 18) is further separated. Immediately, the hydraulic jack 6 for the stopper is contracted, the hydraulic jack 1 for the wedge member is kept extended, the separated portion is lifted by a crane or the like by the hanging bracket 19 of the center block, and is loaded on the truck as it is.
It can be transported to a place without a house and dismantled.

The above-described method is a case where cracks are completely generated between the adjustment ring 15 and the inclined wall 12 of the manhole with a substantially uniform strength structure over the entire circumference. However, the places where cracks are generated by the wedge members 6 are not always uniform in strength over the entire circumference, and there is a case where the resistance is extremely large or small only in the extending direction of one wedge member. It is conceivable that the entire removal instrument is eccentric only at the weak point. When such a situation is reached, the stopper hydraulic jack in the eccentric direction is immediately extended to bring the stopper into strong contact with the inner wall surface of the manhole, thereby returning the stopper to the set center and eliminating the eccentricity.
In this case, the expansion and contraction of the stopper can be quickly dealt with by operating a valve in the hydraulic circuit because of the hydraulic structure.

With such a configuration, it is possible to cope with weak wedge material entry locations in all directions. That is, the imbalance in strength is not limited to the wedge material approach direction. In the configuration of FIG. 1, when the direction of the adjacent wedge member is strong and the direction of the other wedge member is weak, the center of the removal tool itself is the combined direction of the entry direction of the weak wedge member. Therefore, in order to correct such a direction to the set center position, the hydraulic jack 4 for stopper is used.
Are performed in combination.

The above example is merely an example, and the number of wedge members can be set to an appropriate number of three or more depending on the size of the manhole. Accordingly, the number of hydraulic jacks is the same, and the installation angle of the plane with respect to the substrate 9 is 12
0 °.

FIG. 6 shows a structure of another example of the present invention. That is, the four hydraulic jacks 1 for wedges and the hydraulic jacks 4 for stoppers are respectively provided at different positions, and the same type of hydraulic jacks are radially arranged at intervals of 90 °. Are fixedly installed with U bolts 3. In this case, the center block 2 is octagonal. In order to make the stopper hydraulic jack 4 the same as the position shown in FIG. 5, a height adjusting member similar to the height of the wedge hydraulic jack 1 is inserted.

According to this configuration, as the wedge member 6 enters, the structural material at the contact position of the stopper 8 located at the same position does not always collapse and the position of the stopper may become unstable. In order to cope with such a situation, it is possible to maintain a stable stopper action by installing the intermediate member between the wedge members 6 at a low risk of collapse of the structural member due to the entry of the wedge member 6.

In the configuration shown in FIG. 6, it is also possible to use three hydraulic jacks for the wedge and three hydraulic jacks for the stopper, and make the radiation angles adjacent to each other 60 °.

With such a configuration, a stable stopper action can be maintained.

[0033] Due to the structure of the manhole, it may not be possible to support the removal tool at a set center above the entry position of the wedge material. For example, in the case of a manhole structure as shown in FIG.
Cannot be installed reliably. In such a case, as shown in FIG. 7, it is possible to adopt a structure in which the hydraulic jack 1 for wedges is fixed above the substrate 9 and the hydraulic jack 4 for stoppers is fixed below.

Thus, it is possible to cope with a manhole structure in which the removal tool cannot be supported at the set center at a position above the entry position of the wedge member.

The structure in which the hydraulic jack 1 for wedges is fixed to the upper side with respect to the substrate 9 and the hydraulic jack 4 for stoppers is fixed to the lower side is the same as in the example of FIG. It can be configured to be installed and configured to be six.

[0036]

As described above, according to the present invention, in a device for removing a manhole cover frame, a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially arranged on a substrate, and expansion and contraction of each hydraulic jack is prevented. Since the end face touched the center block,

As in the prior art, when the center of the device is displaced due to an excessive amount of each wedge member during use, correction can be quickly performed. Conventionally, it takes a long time for correction due to the screw-in structure, but when the center position is deviated while checking the position as needed, there is an effect that the correction can be performed by immediately driving the necessary hydraulic jack for stopper.

Further, according to the present invention, in a manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are arranged in a radial direction, the hydraulic jack for a wedge member placed and fixed on one surface of a substrate is provided. On the other hand, the hydraulic jack for stopper is fixed at the same position on the plane and is fixed to the hydraulic jack for wedge material, the opposite end face of each hydraulic jack expands and contracts against the center block, and the center block is a polygon corresponding to the number of hydraulic jacks for wedge material Or because it was round,

Since the reaction force is received by the center block when each jack is driven, it does not affect the directional operation set by the other jacks, increases rigidity, and provides a small-sized, high-strength instrument as a whole. Can.

Further, according to the present invention, in a manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially arranged, a stopper is provided for the hydraulic jack for a wedge member placed and fixed on a substrate. Hydraulic jacks are fixed at different positions on the plane and do not coincide with the height center of the hydraulic jack for wedge members. The end faces of the hydraulic jacks opposite to the expansion and contraction abut against the center block, and the center blocks are hydraulic jacks for wedge members and wedges. Polygonal or circular corresponding to the total number of lumber hydraulic jacks,

If the stopper position collapses during crack progression when the wedge hydraulic jack and the stopper hydraulic jack are at the same position, it may be difficult to correct the center position. By positioning the tip of the hydraulic jack for stopper at a position far from the approach position, such a disadvantage can be solved.

Further, according to the present invention, in a manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are arranged in a radial direction, a hydraulic jack for a wedge member placed and fixed on the upper side of a substrate is provided. The hydraulic jacks for stoppers are fixed to the lower side of the circuit board, and the opposite end faces of the hydraulic jacks are in contact with the center block, and the center block is a polygon corresponding to the total number of hydraulic jacks for wedge members and hydraulic jacks for wedge members. Or because it was round,

When the hydraulic jack for stopper cannot be installed at a position higher than the entry position of the wedge member due to the structure of the manhole, the hydraulic jack for stopper is installed at a position lower than the entry position of the wedge member even in such a manhole. Therefore, it is possible to provide such a device having high flexibility and convenience.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

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

FIG. 3 is a front view showing a conventional example.

FIG. 4 is a sectional view of the device of the present invention.

FIG. 5 is a cross-sectional view for explaining the method of the present invention.

FIG. 6 is a plan view showing another embodiment of the present invention.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Hydraulic jack for wedge 2 Center block 3 U bolt 4 Hydraulic jack for stopper 6 Wedge material 8 Stopper 9 Substrate

Claims (8)

(57) [Claims] A wedge member hydraulic jack and a stopper hydraulic jack are radially arranged on a substrate, and the end faces of the hydraulic jacks opposite to the expansion and contraction are in contact with a center block. . 2. A manhole cover frame dismounting device in which a wedge hydraulic jack and a stopper hydraulic jack are arranged in a radial direction. The jacks shall be fixed at the same position on the plane and fixed to the wedge hydraulic jacks, the opposite end faces of each hydraulic jack shall be in contact with the center block, and the center block shall be a polygon or a circle corresponding to the number of wedge hydraulic jacks. An instrument for removing a manhole cover frame. 3. A manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are arranged in a radial direction, wherein the hydraulic jack for the stopper is flat with respect to the hydraulic jack for the wedge member mounted and fixed on the substrate. It is fixed so that it does not coincide with the height center of the hydraulic jack for the wedge member, and the opposite end face of each hydraulic jack expands and contracts against the center block, and the center block is connected to the hydraulic jack for the wedge member and the hydraulic jack for the wedge member. A tool for removing a manhole cover frame having a polygonal or circular shape corresponding to the total number. 4. A manhole cover frame removing device in which a hydraulic jack for a wedge member and a hydraulic jack for a stopper are radially disposed, wherein the hydraulic jack for a stopper is fixed to the hydraulic jack for a wedge member placed and fixed on the upper side of a substrate. Is fixed to the lower side of the board, the opposite end face of each hydraulic jack expands and contracts against the center block, and the center block has a polygonal or circular shape corresponding to the total number of hydraulic jacks for wedge members and hydraulic jacks for wedge members. An instrument for removing a manhole cover frame. 5. The manhole cover frame removing device according to claim 1, wherein the wedge hydraulic jack and the stopper hydraulic jack mounted and fixed on the substrate are detachably fixed to the substrate with U bolts. 6. The manhole cover frame removing device according to claim 2, wherein the wedge hydraulic jack and the stopper hydraulic jack mounted and fixed on the substrate are detachably fixed to the substrate with U bolts. 7. The manhole cover frame removing device according to claim 3, wherein the wedge hydraulic jack and the stopper hydraulic jack mounted and fixed on the substrate are detachably fixed to the substrate with U bolts. 8. A groove is formed in a vertical direction around the manhole cover frame, and a hanging recess is formed in a horizontal direction at a removing position.
Hydraulic jacks for wedges and hydraulic jacks for stoppers are radially arranged on the board, and the opposite end faces of the hydraulic jacks extend and contract, holding the tip of the wedge member of the removal tool that abuts the center block in the hanging recess, and A method for removing a manhole cover frame, characterized in that cracks are induced by entering in a radial direction, and when a crack reaches a groove, entry of a wedge member is stopped.