JP2012041800A - Lifter for removing manhole cover receiving frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifter for removing a manhole cover receiving frame of which lifter can be installed on a road around the manhole; which can maintain its prescribed height and freely rotate in a circumferential direction on the road; which is very easy to position in the height and circumferential directions of a locking part and can correctly insert the locking part into a desired position and can be easily and surely cut a region not yet cut to lift a removed object with a small force; and which is excellent in certainty of separation work and removal work, efficiency, workability, and labor-saving.SOLUTION: A lifter for removing a manhole cover receiving frame comprises: a stretchable part which stretches in a longitudinal direction; locking parts which project from both ends in a longitudinal direction of the stretchable part, respectively, to respective stretching directions thereof and are fixed; holding-up parts each of which is raised from the root of each locking part and has a hook portion for holding-up provided at its top end; and height adjustment parts each of which has a support part slidably disposed in the longitudinal direction of each holding-up part and projecting outward from the locking part and a free wheel turnably disposed around a vertical axis on each support part and grounding on the road around the manhole.

Description

  The present invention relates to a lifter for removing a manhole cover receiving frame for pulling up the manhole cover receiving frame and the surrounding pavement integrally when replacing the manhole cover receiving frame in a manhole such as a water and sewage system.

Conventionally, when replacing an old manhole cover receiving frame or when replacing a manhole cover receiving frame due to repair of a paving surface such as asphalt, the outer periphery of the manhole cover receiving frame is cut or curled, and the surrounding pavement And the manhole cover receiving frame and a part of the surrounding pavement surface (= removed object) are integrated and removed as one lump.
For example, (Patent Document 1) includes a wedge body that can be moved back and forth in two opposite directions or three radial directions in the same plane. Manhole frame peeling machine "is disclosed.
Further, in (Patent Document 2), “a slot is provided along the longitudinal direction of the rod-shaped main body, and one or more latching pieces that can be moved and fixed are provided in the slot. In addition to hooking the necessary part inside the manhole directly or through the auxiliary hooking piece, a hooking hooking part is provided at the end of the rod rod-shaped main body, and the lifting means is interposed between the road surface A removal lifter for removing a manhole from a road surface cut off ”.

Japanese Utility Model Publication No.59-193679 JP 2010-144509 A

However, the above conventional technique has the following problems.
(1) In the manhole frame peeling machine of (Patent Document 1), a wedge body is driven into a boundary portion between the lower end of the manhole frame and its installation surface, or an intermediate portion or a lower surface portion of a level adjusting material layer constituting the installation surface. In this way, the wedge effect is used to separate and lift the locally connected part and the fixed part, etc., but the wedge body must be stretched while being suspended in the manhole and driven into place. Therefore, the posture is not stable, the positioning is difficult, and the workability is lacking. In particular, in order to separate a plurality of connecting parts and fixing parts, the manhole frame peeling machine must be rotated in the circumferential direction, and repeated positioning must be performed each time the wedge body is driven into a different position. It was cumbersome and time consuming, and had problems of lack of usability and functionality.
(2) The removal lifter for the manhole road surface removal product of (Patent Document 2) can place and support both ends of the rod-like main body on the road surface. By inserting a lifting means such as a hand jack between the stop and the road surface, and operating the lifting means to incline the rod-shaped main body with respect to the horizontal road surface, the annular removal object is not cut. Since the part is peeled off by the principle of leverage, if the stress is concentrated in one place and the manhole cover frame or rod-shaped main body itself is deformed or the removed object is partially chipped, The cutting location could not be cut, and there was a problem that the certainty of peeling was lacking. In addition, when the uncut portion is solid or the range is wide, it may be necessary to rotate the rod rod-shaped main body in the circumferential direction and change the position of the latch piece and the lifting means. However, in the state where the removed object is inclined with respect to the road surface, it is difficult to interpose the lifting means between the hooking portion of the rod-shaped main body and the road surface, and the removed object is removed by cutting the uncut portion. It could not be lifted and had the problem of lack of workability and functionality.

  The present invention solves the above-described conventional problems, and can be placed on the road surface around the manhole to maintain a predetermined height, and can be freely rotated in the circumferential direction on the road surface, and the locking portion. Positioning in the height direction and circumferential direction is extremely easy, the locking part can be inserted accurately at a desired position, and the removed material can be lifted up easily and reliably by cutting the uncut portion with a small force. The purpose is to provide a lifter for removing the manhole cover receiving frame that is excellent in the reliability, efficiency, workability, and labor saving of the peeling work and removal work that can be performed.

In order to solve the above conventional problems, the lifter for removing the manhole cover receiving frame of the present invention has the following configuration.
The lifter for removing the manhole cover receiving frame according to claim 1 of the present invention is a lifter for removing the manhole cover receiving frame for integrally lifting the manhole cover receiving frame and the surrounding pavement when the manhole cover receiving frame is replaced. Expansion and contraction parts extending and contracting in the direction, locking parts protruding in the extension direction from the both ends in the longitudinal direction of the expansion and contraction parts, and standing upward from the roots of the locking parts A lifting part formed with a lifting hook part, a support part slidably arranged in the longitudinal direction of each lifting part and projecting outward from the locking part, and perpendicular to each supporting part And a height adjusting unit having a free wheel that is arranged so as to be rotatable around an axis and that contacts a road surface around a manhole.
With this configuration, the following effects can be obtained.
(1) Since it has a locking part that is fixed and protrudes in the extending direction from both ends in the longitudinal direction of the expansion / contraction part, the expansion / contraction part can be expanded / contracted according to the size of the manhole cover receiving frame. Can be surely inserted into the bottom of the manhole cover receiving frame and the uncut portion can be cut easily and reliably, and the versatility and the reliability of the peeling work are excellent.
(2) Since it has a lifting part that is erected upward from the base of each locking part and is formed with a hook part for lifting at the upper end, it can be hooked with a rope or other hook on the hook part. Lifting, manhole cover frame and surrounding pavement (removed material) can be removed at once, and it is excellent in removal efficiency, workability and labor saving.
(3) Since it has a height adjusting portion that is slidably arranged in the longitudinal direction of each lifting portion, the height of the locking portion can be adjusted freely by moving the height adjusting portion up and down. It is possible to securely insert the locking portion in accordance with a desired position such as the bottom of the manhole cover receiving frame, and it is excellent in versatility and efficiency of positioning work.
(4) Since the height adjustment part has a support part that protrudes outward from the locking part, and each support part is rotatably arranged around the vertical axis and has a free wheel that contacts the road surface around the manhole. Regardless of the length of the telescopic part, the free wheel can be securely placed (grounded) on the road surface around the manhole and the locking part can be maintained at a predetermined height, there is no risk of dropping, and workability Excellent safety.
(5) Since the height adjustment part is disposed on each support part so as to be rotatable around the vertical axis and has a free wheel for grounding on the road surface around the manhole, the free wheel is placed on the road surface around the manhole (grounding) ) With the locking part kept at a predetermined height, the telescopic part can be expanded and contracted, and the telescopic part can be rotated in the circumferential direction, and an arbitrary position in the circumferential direction of the manhole can be selected. The locking part can be inserted, positioning in the circumferential direction is extremely easy, and the uncut part can be easily and reliably cut with a small force for efficiency, workability and labor saving. Excellent.

Here, the expansion / contraction part may be any one that expands and contracts in the longitudinal direction. In particular, a hydraulic cylinder that has a high expansion / contraction speed, excellent responsiveness, and can generate a large force can be preferably used.
By extending the telescopic part and inserting the locking part into the bottom of the manhole cover receiving frame, etc., the uncut portion is cut, but in order to make it easier to insert into the gap or cracks at the bottom of the manhole cover receiving frame, etc. What has a wedge-shaped latching claw at the front-end | tip of is used suitably. In addition, when the locking part is inserted into the bottom of the manhole cover receiving frame and lifted, the top surface (contacting surface) of the locking claw should be level and flat to support the removed material and prevent it from falling. It is preferable to form.

The hook part should just be connected with the crane etc. for lifting the lifter for manhole cover receiving frame removal. The hook part can be arbitrarily selected from various shapes such as hole, ring, claw, etc., and can be directly attached to the rope, hooked to the ring formed at the end of the rope, or attached to the end of the rope It can be connected to a crane by hooking a hook. The hook portion may be formed integrally with the lifting portion according to its shape, or may be attached by welding or screwing with another member.
The support portion may be any member that can be fixed by moving in the longitudinal direction (in the height direction) of the lifting portion, and one that is fixed by screwing or pin fitting is preferably used.

The support part of the height adjustment part protrudes outward from the locking part, but the length from the tip of one locking part to the tip of the other locking part is short when the telescopic part is contracted to the shortest. It is formed shorter than the inner diameter of the manhole cover receiving frame and the manhole cover receiving frame is always removed by the universal wheel regardless of the length of the telescopic part by arranging the universal wheel on the support so that it contacts the road surface around the manhole. The lifter can be suspended in the manhole so as to be locked on the road surface, and is excellent in safety and handling.
The number and arrangement of the free wheels of each height adjustment unit can be appropriately selected according to the shape and size of the support unit, but when two free wheels are arranged on each support unit, 4 It can be reliably supported at a point, can prevent the occurrence of torsion and the like when it falls or stretches the stretchable part, and has excellent posture stability and operational certainty.

The invention according to claim 2 is the lifter for removing the manhole cover receiving frame according to claim 1, wherein the lifting portion includes two vertical shafts arranged in parallel in the width direction of the locking portion, The support part of the height adjustment part has a configuration including a clamping part that clamps the two vertical axes of the lifting part.
With this configuration, in addition to the operation obtained in the first aspect, the following operation can be obtained.
(1) The lifting portion includes two vertical shafts arranged in parallel in the width direction of the locking portion, and the support portion of the height adjusting portion includes a sandwiching portion that sandwiches the two vertical shafts of the lifting portion. Therefore, the support part of the height adjustment part can be firmly fixed to the two vertical axes of the lifting part, and the lifting part can be rotated without being rotated or twisted by an external force. Thus, the stretchable part and the locking part can be reliably supported by the support part, and the support reliability and the posture stability are excellent.

  Here, the clamping part may be anything that can clamp the vertical axis, but a clamping part that fixes the clamping pieces arranged opposite to each other by screwing is preferably used. By simply loosening the screw, the interval between the clamping pieces can be increased and the clamping part can be moved up and down along the vertical axis, so that the height of the support part can be adjusted easily.

The invention according to claim 3 is the lifter for removing the manhole cover receiving frame according to claim 1 or 2, wherein a scale indicating the position of the support portion in the height direction is arranged on a side portion of the lifting portion. It has a configuration.
With this configuration, in addition to the operation obtained in the first or second aspect, the following operation can be obtained.
(1) Since the scale indicating the position of the support portion in the height direction is arranged on the side of the lifting portion, the height of each height adjustment portion can be adjusted easily and reliably. It is possible to level the expansion and contraction part, match the locking part to the same height, support the removed object with equal force and lift it, and it is excellent in usability and workability.

  Here, the scale may be engraved directly on the side portion of the lifting portion, or a scale formed by printing on another member or the like may be attached.

As described above, according to the lifter for removing the manhole cover receiving frame of the present invention, the following advantageous effects can be obtained.
According to the first aspect of the invention, the following advantageous effects can be obtained.
(1) Place the free wheel of the height adjustment unit on the road surface around the manhole (ground), and extend and contract the expansion / contraction part while keeping the locking part at a predetermined height. It can be rotated in the circumferential direction, and the locking part can be inserted by selecting an arbitrary position in the circumferential direction of the manhole. It is possible to provide a lifter for removing a manhole cover receiving frame that can be easily and surely cut and is excellent in the efficiency, workability, and labor saving of the peeling work.

According to the invention described in claim 2, in addition to the effect described in claim 1, the following advantageous effects can be obtained.
(1) The support part of the height adjustment part can be firmly fixed to the two vertical axes of the lifting part, and the supporting part is not rotated or twisted by an external force. Thus, it is possible to provide a lifter for removing a manhole cover receiving frame that is capable of reliably supporting the expansion / contraction portion and the locking portion with the support portion and that is excellent in support reliability and posture stability.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2, the following advantageous effects are acquired.
(1) The height of each lifting part can be adjusted easily and reliably, and the retractable part is supported with equal force by leveling the locking part to the same height with the expansion and contraction part horizontal. It is possible to provide a lifter for removing a manhole cover receiving frame that is excellent in usability and workability.

The partial cross section side view which shows the state which mounted the lifter for manhole cover receiving frame removal in Embodiment 1 on the road surface 1 is a cross-sectional view taken along line AA in FIG. BB sectional view taken on line in FIG. Partial cross-sectional side view showing the lifted state of the removed object by the lifter for removing the manhole cover receiving frame in the first embodiment

Hereinafter, a lifter for removing a manhole cover receiving frame in an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 is a partial cross-sectional side view showing a state where a lifter for removing a manhole cover receiving frame in Embodiment 1 is placed on a road surface, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. It is a BB arrow directional cross-sectional view of FIG.
In FIG. 1, 1 is a lifter for removing a manhole cover receiving frame in the first embodiment, 2 is an expansion / contraction part of the lifter 1 for removing the manhole cover receiving frame using a hydraulic cylinder that expands and contracts in the longitudinal direction, and 3 is a longitudinal direction of the expansion / contraction part 2 Locking portions fixedly projecting from both ends in the extending direction, 4 is a lifting portion standing upward from the base of each locking portion 3, and 5 is formed at the upper end of the lifting portion 4. Hooks for lifting, 6 is a height adjusting unit disposed slidably in the longitudinal direction of each lifting unit 4, 10 is a road surface around the manhole 11, 11 a is an opening of the manhole 11, and 12 is a manhole 11 13 is an adjustment ring disposed on the upper portion of the oblique wall block 12, and 14 is a filler filled between the adjustment ring 13 and the manhole cover receiving frame 15.

Next, the detail of a latching | locking part is demonstrated.
1 and 2, 2a is a fixing portion disposed at both ends of the telescopic portion 2, 3a is a base portion of the locking portion 3 fixed in contact with the fixing portion 2a, and 3b is formed in a wedge shape. The locking claws 3c of the locking portion 3 are inclined surfaces (FIG. 1) formed on the lower surface side of the locking claw 3b, and 4a is two lifting portions 4 arranged in parallel in the width direction of the locking portion 3. It is the vertical axis (FIG. 2).
The lifter 1 for removing the manhole cover receiving frame extends the expansion / contraction part 2 and inserts the locking part 3 into the bottom of the manhole cover receiving frame 15 to cut the uncut portion, but the inclined surface 3c is formed on the lower surface side. Since the wedge-shaped locking claw 3b is provided, it can be easily inserted into a gap or a crack in the bottom of the manhole cover receiving frame 15 or the like. Moreover, by forming the upper surface (contact surface) of the latching claw 3b in a horizontal flat shape, the removed object can be reliably supported and lifted, and the fall can be prevented.

Next, details of the height adjustment unit will be described.
1 and 3, 4 b is a scale (FIG. 1) disposed on the side of the vertical shaft 4 a of the lifting portion 4, and 6 a is a support portion of the height adjusting portion 6 that protrudes outward from the locking portion 3. , 7 is a holding part of the support part 6a for holding the two vertical shafts 4a of the lifting part 4, 7a is a fixed piece of the holding part 7 disposed on the base side of the support part 6a, and 7b is for holding the vertical axis 4a The movable piece 7c of the holding part 7 disposed opposite to the fixed piece 7a is fixed to the holding part 7 so as to penetrate the movable piece 7b and be screwed to the fixed piece 7a to adjust the distance between the fixed piece 7a and the movable piece 7b. Two screws 8 are arranged at the bottom of the support portion 6a so as to be rotatable around a vertical axis and are grounded to the road surface 10 around the manhole.
The height of the supporting portion 6a of the height adjusting portion 6 is adjusted using the scale 4b in advance so that the height of the locking portion 3 is adjusted to a desired position such as the bottom of the manhole cover receiving frame 15 or a gap (break). Thus, the locking portion 3 can be reliably inserted into a desired position.

A method of using the lifter for removing the manhole cover receiving frame configured as described above will be described.
After the road surface 10 on the outer periphery of the manhole cover receiving frame 15 is cut or curled and cut off from the surrounding pavement, the stretchable portion 2 of the lifter 1 for removing the manhole cover receiving frame is contracted as shown in FIG. Then, the telescopic part 2 and the locking part 3 are lowered from the opening part 11 a into the manhole 11, and the free wheel 8 is placed (grounded) on the road surface 10 around the manhole 11.
Then, as shown in FIG. 4, the telescopic part 2 is extended, and the locking claw 3 b of the locking part 3 is inserted between the adjustment ring 13 and the filler 14. At this time, the telescopic portion 2 can be rotated in the circumferential direction while the universal wheel 8 is placed (grounded) on the road surface 10 and the locking portion 3 is maintained at a predetermined height. An arbitrary position in the circumferential direction can be selected and the locking portion 3 can be inserted, and an uncut portion can be cut easily and reliably.
Thereafter, a rope or other hook is hooked on the hook portion 5 and lifted by a crane or the like, and the manhole cover receiving frame 15 and the surrounding pavement (removed material) are removed together.

Since the lifter for removing the manhole cover receiving frame of the first embodiment is configured as described above, it has the following effects.
(1) Since it has a locking part that is fixed and protrudes in the extending direction from both ends in the longitudinal direction of the expansion / contraction part, the expansion / contraction part can be expanded / contracted according to the size of the manhole cover receiving frame. Can be surely inserted into the bottom of the manhole cover receiving frame and the uncut portion can be cut easily and reliably, and the versatility and the reliability of the peeling work are excellent.
(2) Since it has a lifting part that is erected upward from the base of each locking part and is formed with a hook part for lifting at the upper end, it can be hooked with a rope or other hook on the hook part. Lifting, manhole cover frame and surrounding pavement (removed material) can be removed at once, and it is excellent in removal efficiency, workability and labor saving.
(3) Since it has a height adjusting portion that is slidably arranged in the longitudinal direction of each lifting portion, the height of the locking portion can be adjusted freely by moving the height adjusting portion up and down. It is possible to securely insert the locking portion in accordance with a desired position such as the bottom of the manhole cover receiving frame, and it is excellent in versatility and efficiency of positioning work.
(4) Since the height adjustment part has a support part that protrudes outward from the locking part, and each support part is rotatably arranged around the vertical axis and has a free wheel that contacts the road surface around the manhole. Regardless of the length of the telescopic part, the free wheel can be securely placed (grounded) on the road surface around the manhole and the locking part can be maintained at a predetermined height, there is no risk of dropping, and workability Excellent safety.
(5) Since the height adjustment part is disposed on each support part so as to be rotatable around the vertical axis and has a free wheel for grounding on the road surface around the manhole, the free wheel is placed on the road surface around the manhole (grounding) ) With the locking part kept at a predetermined height, the telescopic part can be expanded and contracted, and the telescopic part can be rotated in the circumferential direction, and an arbitrary position in the circumferential direction of the manhole can be selected. The locking part can be inserted, positioning in the circumferential direction is extremely easy, and the uncut part can be easily and reliably cut with a small force for efficiency, workability and labor saving. Excellent.
(6) The lifting portion includes two vertical shafts arranged in parallel in the width direction of the locking portion, and the support portion of the height adjusting portion includes a clamping portion that clamps the two vertical shafts of the lifting portion. Therefore, the support part of the height adjustment part can be firmly fixed to the two vertical axes of the lifting part, and the lifting part can be rotated without being rotated or twisted by an external force. Thus, the stretchable part and the locking part can be reliably supported by the support part, and the support reliability and the posture stability are excellent.
(7) Since the scale indicating the position of the support portion in the height direction is arranged on the side of the lifting portion, the height of the height adjustment portion of each lifting portion can be easily and reliably adjusted. It is possible to level the expansion and contraction part, match the locking part to the same height, support the removed object with equal force and lift it, and it is excellent in usability and workability.

  The present invention can be placed on the road surface around the manhole and maintained at a predetermined height, and can be freely rotated in the circumferential direction on the road surface. Positioning is extremely easy, the locking part can be accurately inserted at the desired position, and the removal and removal work can be lifted by cutting the uncut portion easily and reliably with a small force. By providing a lifter for removing the manhole cover receiving frame that is excellent in efficiency, workability, and labor saving, it is possible to contribute to improving work efficiency and shortening the construction period.

DESCRIPTION OF SYMBOLS 1 Lifter for removing manhole cover receiving frame 2 Extendable part 2a Fixing part 3 Locking part 3a Base part 3b Locking claw 3c Inclined surface 4 Lifting part 4a Vertical shaft 4b Scale 5 Hook part 6 Height adjustment part 6a Support part 7 Holding part 7a Fixing Piece 7b Movable piece 7c Fixing screw 8 Swivel wheel 10 Road surface 11 Manhole 11a Opening portion 12 Slanted wall block 13 Adjustment ring 14 Filler 15 Manhole cover receiving frame

Claims (3)

When replacing the manhole cover receiving frame, a lifter for removing the manhole cover receiving frame for integrally lifting the manhole cover receiving frame and the surrounding pavement,
An elastic part that expands and contracts in the longitudinal direction, a locking part that protrudes and extends in the extension direction from both ends in the longitudinal direction of the elastic part, and an upper end that stands up from the base of each locking part A lifting portion formed with a lifting hook portion, a support portion slidably disposed in the longitudinal direction of each lifting portion and projecting outward from the locking portion, and each supporting portion. A lifter for removing a manhole cover receiving frame, comprising: a height adjusting portion having a free wheel which is arranged so as to be rotatable around a vertical axis and which contacts a road surface around the manhole. The lifting portion includes two vertical shafts arranged in parallel in the width direction of the locking portion, and the support portion of the height adjusting portion sandwiches the two vertical shafts of the lifting portion. The lifter for removing a manhole cover receiving frame according to claim 1, further comprising a portion. The lift for removing a manhole cover receiving frame according to claim 1 or 2, wherein a scale indicating a position in the height direction of the support portion is disposed on a side portion of the lifting portion.

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