JP2013044092A - Grating lifting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grating lifting tool with which only a target grating can be lifted up in a vertical direction safely and surely by a light weight, low-priced and maintenance-free tool.SOLUTION: A grating lifting tool comprises: a bar-like movable beam (1) in which through holes (1a, 1a) are opened in both terminals in a length direction; a pair of handles (2) which are fixed at both sides of the movable beam (1) in the length direction; a pair of plates (3) which are provided similarly at both lower surface sides of the movable beam (1); a support rod (4) including supporting arms (4a) which are provided perpendicularly from bottom plates (3A) of the pair of plates (3) to be freely rotatable for supporting a grating; and screw members (6, 6) which are inserted into the through holes (1a, 1a) for screw-leading the movable beam (1).

Description

  The present invention relates to a groove lid lifting tool that facilitates removal of a groove lid fitted in a side groove.

  Conventionally, side grooves such as U-shaped grooves and concrete walls are provided on both sides of a road or the like, but since the upper surface opening of such a side groove is fitted with a concrete groove lid, To perform cleaning or the like, it is necessary to remove the groove lid.

  If the groove cover is attached to the side groove for a short period (about half a year), the force required to remove the groove cover is almost the weight that an adult male can normally lift (even a heavy one is about 40 kg). It can be done manually without relying on machines.

  However, when the period in which the groove lid is attached to the side groove is long (six months to one year or more), it is between the inner wall of the side groove and the side surface of the groove lid, or before and after the longitudinal direction (also referred to as the flowing water direction, hereinafter the same). (Also referred to as upstream and downstream sides. The same applies hereinafter.) When fine soil or sand enters between the side surfaces of adjacent groove lids, or solidifies after they are mud, In some cases, the groove lid is tightly fitted, and it is difficult to lift easily with a normal lifting force. In addition, no jig that can easily lift the groove lid vertically has been confirmed.

In preparation for such a case, as an apparatus for removing the groove lid, for example, techniques as shown in Patent Document 1 and Patent Document 2 below have been developed.
The apparatus for removing the groove lid shown in Patent Document 1 and Patent Document 2 is a horizontal structure in which hooks are respectively attached to the ends of a pair of chains or belts suspended from both ends on a frame body having four wheels. Member and a jack for raising and lowering the horizontal member up and down, and the jack in a state where both the hooks are engaged with the notch holes for handling formed on the front and back side surfaces of the groove cover in the longitudinal direction. By driving the groove lid, the groove lid can be moved up and down.

JP-A-8-53875 Japanese Patent Laid-Open No. 11-11887

However, the apparatus described in Patent Document 1 or Patent Document 2 has the following problems.
(1) It is the structure which supports both ends of the longitudinal direction of a groove cover using adjustment tools, such as a chain or a belt which can be adjusted to a longitudinal direction and a left-right direction, and one place of the center part of the longitudinal direction of a horizontal member is provided. Since it is configured to lift with a jack while balancing, the work of lifting the groove lid vertically tends to be unstable.

  (2) Furthermore, since it is movable by four wheels, it is difficult to align the device with the groove lid, and in some cases the groove lid after swinging may swing in the longitudinal direction or the left-right direction. There is a risk that the supported groove lid will fall. In particular, for side grooves provided along an unpaved road, a large rattle is likely to occur when moving on an unpaved road, so there is a high risk that the groove lid will fall during movement.

  (3) When the target groove lid is further lifted, the front and rear groove lids adjacent to it are lifted together.

  (4) Since it is necessary to arrange a so-called pandagraph jack or hydraulic jack on a frame body having four wheels, the weight of the entire apparatus becomes heavy and it is difficult to reduce the manufacturing cost.

  (5) Since it has a mechanism member such as four wheels, a panda graph jack or a hydraulic jack, it needs to be regularly maintained.

  In order to solve the problems in the prior art described above, the present invention can lift only the intended groove lid safely and reliably in the vertical direction, and is lightweight, inexpensive in manufacturing cost, and maintenance-free. It is an object to create a groove lid lifting tool that can be provided.

Among the means for solving the above problems, the main means of the present invention is as follows.
A rod-shaped movable beam having through-holes formed at both ends in the longitudinal direction, a pair of handles fixed on both sides of the movable beam in the longitudinal direction, and a pair of plates provided on the lower surfaces of both sides of the movable beam, A support rod having a support arm that is rotatably mounted on each bottom plate of the pair of plates and supports the groove lid, and a screw member that is inserted into the through hole and screw-feeds the movable beam. It is said that.

  In the groove lid lifting tool having the above-described configuration, a notch hole for a hand in the longitudinal direction of the target groove lid (commonly referred to as “handing”. There is a single-handed groove cover (see FIG. 1) having one-handed handle on only one side, but the width dimension (vertical width dimension) in the longitudinal direction of each hand is 2 to 3 cm). After inserting and attaching the fixed beam, by rotating the screw member in a predetermined direction at positions on both sides of the movable beam, the movable beam is screwed upward relatively, and the support rod provided on the plate The support arm supports the lower surface of the groove lid from the front and rear in the longitudinal direction. For this reason, by further rotating the screw member, it is possible to reliably achieve a mechanical lifting of 1 to 2 cm in the vertical direction even if the groove lid is firmly fitted to the side groove body.

  According to another aspect of the present invention, the means according to claim 1 includes a fixed beam that supports the screw member and raises the movable beam when the tip of the screw member that is feeding the screw contacts. Is.

  In the above-described means, lifting of only the target groove lid is achieved by pressing down the other groove lid on which the fixed beam is disposed adjacently.

  According to another aspect of the present invention, in the means according to claim 1 or 2, a pair of support holes are formed in each bottom plate of the plate, and a support rod formed by bending a round bar into a crank shape is formed as a pair of support holes. It is said that it was rotatably inserted into the inside.

  With the above means, the support rod can be easily inserted into the notch for handling.

  According to another aspect of the present invention, in the means according to claim 3, the distance between the one support hole and the other support hole is set to be longer than the length dimension obtained by doubling the length dimension of the support arm of the support rod. It is said that it was made into a long dimension and less than the width dimension of the notch for a hand formed in the groove cover.

  That is, when the distance between one support hole and the other support hole is Wa, the length dimension of the support arm of the support rod is L, and the lateral width dimension of the handle notch hole formed in the groove lid 11 is Wb. 2 · L <Wa <Wb makes it possible to insert the pair of support rods into the notch holes for handling with the tips of the support arms of the pair of support rods facing each other. , Achieve smooth insertion work.

  According to another aspect of the present invention, in the means according to claim 3 or 4, a stopper for restricting the rotation of the support rod is formed in the vicinity of the support hole formed in the bottom plate.

  In the above means, the rotation of the support rod in the support hole is limited in the stage of inserting the support rod into the notch for handling and in the state where the groove lid is supported and lifted by the support arm.

According to another aspect of the present invention, in the means according to any one of claims 1 to 5,
It is said that nuts that can be screwed to the screw member are fixed to both ends of the movable beam so as to communicate with the through hole.

  With the above means, a reliable screw feeding operation is achieved.

  Furthermore, another means of the present invention is the means according to any one of claims 1 to 6, wherein the screw member is a bolt.

  With the above-described means, the overall weight of the groove lid lifting tool according to the present invention can be reduced and the manufacturing cost can be reduced.

  Furthermore, another means of the present invention is the means according to any one of claims 1 to 7, wherein the length of the movable beam can be adjusted.

  In the above means, by adjusting the length dimension of the movable beam, the distance between the support rods on both sides in the longitudinal direction is made to coincide with the distance between the pair of notch holes for handling located on both sides in the longitudinal direction of the groove cover. To achieve.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, since a large lifting force can be generated only by rotating a pair of screw members provided at both ends of the movable beam, the groove lid is tightly fitted to the side groove body. Even so, it can be easily lifted.
In addition, by carrying out the screw turning work at both ends of the movable beam substantially evenly, the lifting amount of the support rods on both the front and rear sides can be adjusted, and it is possible to stably lift up vertically while maintaining the balance of the groove lid Become. Then, after lifting the groove lid by 1 to 2 cm, two workers arranged on the front and rear sides in the longitudinal direction of the groove lid lift the entire groove lid lifting tool upward by about 7 to 10 cm while holding the handles by human power. Thus, it is possible to easily lift the groove lid from the side groove main body and move it laterally.

  In addition, when the pair of support rods are inserted into the cutout holes for both hands, the center of gravity of the fixed beam and the center of gravity of the groove lid can be substantially matched, so that it can be lifted stably in the vertical direction. You can work safely without shaking.

Further, in the configuration including the fixed beam that supports the screw member and raises the movable beam when the tip of the screw member that is feeding the screw comes into contact, the other groove lid in which the fixed beam is disposed adjacently is provided. Therefore, it is possible to prevent the groove cover other than the target groove cover from being lifted together with the target groove cover. That is, only the intended groove lid can be lifted.
Even when the adjacent groove lid is already removed, the intended groove lid can be similarly lifted by using the fixed beam.

  Further, in a configuration in which a pair of support holes are formed in each bottom plate of the plate and a support rod formed by bending a round bar into a crank shape is rotatably inserted into the pair of support holes, the groove lid is supported. The support rod can be configured easily, and the manufacturing cost can be reduced. In addition, the support rod can be easily and reliably inserted into the cutout hole for handling.

  In addition, the distance between the one support hole and the other support hole, the length longer than the length of the support arm of the support rod that is twice the length, and the notch for the hand formed in the groove lid In the configuration of less than the width dimension, the pair of support rods can be inserted into the notch holes for handling with the tips of the support arms of the pair of support rods facing each other. It is possible to perform smoothly. Then, after the insertion is completed, the pair of support rods are each rotated 90 degrees in the opposite direction, whereby the lower surface of the groove lid can be reliably supported by each support arm.

  If the stopper that restricts the rotation of the support rod is formed in the vicinity of the support hole drilled in the bottom plate, the support rod rotates and is inserted during the work process of inserting the support rod into the support hole. It is possible to prevent the work from being disabled. That is, the operation of inserting the support rod into the support hole can be easily and reliably achieved. In addition, since it is possible to prevent the support rod from rotating, it is possible to prevent the occurrence of an accident in which the support arm supporting the lower surface of the groove lid is detached from the lower surface and the groove lid falls.

  In addition, in a configuration in which nuts that can be screwed to the screw member are fixed to both ends of the movable beam in a state of communicating with the through hole, screw feeding work using the screw member can be performed smoothly and with high accuracy. By performing the screw turning operation at both ends of the movable beam substantially evenly, the vertical lifting operation can be performed, and the lifting operation of the groove cover can be stabilized. As a result, reliable and safe work without rework is possible.

Further, in the configuration in which the screw member is a bolt, the overall weight of the groove lid lifting tool can be reduced, and the manufacturing cost can be reduced.
In addition, a dedicated jack such as a panda graph jack or a hydraulic jack is not required, and the screw member can be configured with a general-purpose product such as a bolt and a member with few problems, so that maintenance-free operation can be achieved.

  In the configuration in which the length of the movable beam can be adjusted, the distance in the longitudinal direction of the support rods on both sides can be made to correspond to the notch holes for handling provided on both sides of the groove lid as appropriate. It is possible to lift a plurality of types of groove lids having different length dimensions.

It is a perspective view which shows the whole structure of the groove lid lifting tool of this invention. It is a top view of a groove lid lifting tool. It is a side view of a groove lid lifting tool. It is a front view of a groove lid lifting tool. A is a side view showing a first work process using a groove lid lifting tool, and B is a cross-sectional view from the direction of the arrow in line bb of A. FIG. The 2nd work process of the work using a groove lid lifting tool is shown, A is a side view similar to Drawing 5A, and B is a sectional view from the direction of an arrow in the bb line of A. The 3rd operation process of the operation | work using a groove cover lifting tool is shown, A is a side view similar to FIG. 5, B is sectional drawing from the arrow direction in the bb line of A. FIG. The 4th work process of work using a groove lid lifting tool is shown, A is the side view similar to Drawing 5, and B is a sectional view from the direction of the arrow in the bb line of A. It is a side view which shows the other Example of a groove lid lifting tool, A shows the state before adjustment, B shows the state after adjustment.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a perspective view showing the overall configuration of the groove lid lifting tool of the present invention, FIG. 2 is a plan view of the groove lid lifting tool, FIG. 3 is a side view of the groove lid lifting tool, and FIG. 4 is a front view of the groove lid lifting tool. It is.

  The groove lid lifting tool shown in FIGS. 1 to 4 is vertically lifted by 1 to 2 cm before lifting and moving the groove lid covering the upper surface opening of the side groove, and the side wall of the side groove and the side surface of the groove lid Or between the side surfaces of the groove lid adjacent to the front and back in the longitudinal direction (flowing water direction), fine soil or sand enters the mud, and then the solidified part is collapsed to lift the groove lid. By lifting together, it is possible to easily perform subsequent lifting (7 to 10 cm) and lateral movement by human power.

  As shown in FIGS. 1 to 4, the groove lid lifting tool has a movable beam 1 having a predetermined length of prismatic (or rod-like) length, and is fixed to both sides (both sides in the longitudinal direction) of the movable beam 1. The substantially U-shaped handles 2, 2 are fixed by welding, and further, substantially triangular plates 3, 3 are fixed by welding at positions on both sides of the lower surface of the movable beam 1.

  Through holes 1a and 1a are formed at both ends of the movable beam 1, and nuts 7 and 7 are fixed to the lower surface thereof by welding. The through holes 1a and 1a and the nuts 7 and 7 communicate with each other in the vertical direction. A bolt 6 </ b> A constituting one aspect of the screw member 6 can be screwed into the through hole 1 a and the nut 7. In addition, in the structure which cut the thread on the inner surface of the through-holes 1a and 1a, it is possible to make the nuts 7 and 7 unnecessary.

  A bottom plate 3A having a horizontal surface is provided at the bottom of the plate 3. In addition, you may reinforce by welding a board | plate material between the lower surface of the movable beam 1, and the plate 3, and between the plate 3 and its baseplate 3A.

  A pair of support holes 3a, 3a penetrating in the vertical direction are formed in the left and right positions of the bottom plate 3A. Inside these support holes 3a and 3a, both ends of a round steel bar are bent vertically in a crank shape, support arms 4a are formed on the lower side, and support rods 4 and 4 formed with control arms 4b on the upper side are freely rotatable. Have been loosely inserted.

The distance between one support hole 3a and the other support hole 3a arranged in the left-right direction is Wa (see FIG. 2). The interval Wa is formed with a length longer than the length dimension 2 · L, which is twice the length dimension L of the support arm 4a (2 · L <Wa). On the other hand, the distance Wa between the pair of support holes 3a, 3a is shorter than the lateral width Wb (see FIGS. 1 and 4) of the handle notch hole 11A formed in at least one of the longitudinal directions of the groove lid 11. It is formed (Wa <Wb).
For this reason, one support rod 4 and the other support rod 4 are rotated in the respective support holes 3a, 3a so that the tips of the support arms 4a, 4a are brought close to each other and arranged in a straight line. (See FIGS. 1, 4 and 5B), the pair of support rods 4 and 4 can be easily inserted into the notch hole 11A for handling.

  On the bottom plate 3A and in the vicinity of the support hole 3a, protruding stoppers 5 and 5 are provided so as to face each other. The distance between the one stopper 5 and the other stopper 5 is slightly larger than the thickness of the support rods 4 and 4. By inserting the control arm 4b of the support rod 4 between the one stopper 5 and the other stopper 5, the rotation of the support rod 4 can be restricted.

  At least one of the longitudinal sides of the groove lid 11 is provided with a cut-out hole 11A for handling, and a groove lid is provided between the plurality of groove lids 11 arranged in tandem in the longitudinal direction in the side groove body 12. For each of the 11 longitudinal dimensions, a notch 11A for handling is arranged.

  Here, when the length dimension (vertical dimension) in the longitudinal direction of the groove lid 11 is La, a pair of support arms 4a provided on one plate 3 side disposed on both sides in the longitudinal direction of the groove lid lifting tool, The distance between 4a and the pair of support arms 4a, 4a provided on the other plate 3 side is also set to La.

The fixed beam 8 is preferably a member made of a metal square steel or a square pipe which is not easily bent and deformed. However, it is possible to substitute wood or a synthetic resin material having high strength.
The length L1 of the fixed beam 8 is preferably W1 <L1 when the width dimension of the side groove body 12 is W1 (see FIG. 1), but may be the same as the outer width of the side groove body.

  The screw member 6 may be a hexagon bolt that can be easily rotated using a ratchet wrench or the like and that has a low component unit price.

As an operation using the groove lid lifting tool having the above-described configuration, an operation process for removing the groove lid will be described.
5 to 8 show the steps of the work using the groove lid lifting tool, FIG. 5A is a side view showing the first work process using the groove lid lifting tool, and B is a line bb of A. 6 is a sectional view from the arrow direction in FIG. 6, FIG. 6 shows the second work process, A is a side view similar to FIG. 5, B is a sectional view from the arrow direction in the bb line of A, FIG. A shows a work process, A is a side view similar to FIG. 5, B is a cross-sectional view from the direction of the arrow in line bb of A, FIG. 8 shows a fourth work process, A is a side view similar to FIG. B is a cross-sectional view from the direction of the arrow in line bb of A. FIG.

  As shown in FIG. 5, in the first work process, the groove lid lifting tool is moved over the head of the groove lid 11 to be removed from the side groove body 12. At this time, as shown in FIG. 5B, one support rod 4 and the other support rod 4 are set in a state in which the tips of the support arms 4a and 4a are close to each other. In this state, since the control arm 4b is set between the stopper 5 and the plate 3, the support rod 4 does not rotate unless the control arm 4b gets over the stopper 5.

  Therefore, at both ends in the longitudinal direction of the groove lid 11, the pair of support arms 4a and 4a are aligned with the notch holes 11A provided in the longitudinal direction of the groove lid 11, and the groove lid is lifted from this state. By lowering the tool, the pair of support arms 4a, 4a can be smoothly inserted into the notch hole 11A for handling at both ends of the groove lid 11 in the longitudinal direction. The insertion of the pair of support arms 4a and 4a into the cutout hole 11A is applicable not only to the single-hand groove cover as shown in this embodiment but also to the double-hand groove cover. Is possible.

  At this time, the lower surface of the bottom plate 3 </ b> A of the plate 3 is placed on the surface of the groove lid 11. Further, the gravity center position of the groove lid lifting tool and the gravity center position of the groove lid 11 are set to substantially coincide with each other. Therefore, the groove lid 11 can be stably lifted in the vertical direction.

  6A and 6B, in the state where the control arm 4b of the support rod 4 is pulled upward, the tips of the support rod 4 are rotated 90 degrees in the opposite directions and separated from each other. The control arm 4b is inserted into the portion facing the other stopper 5. Thereby, while being able to regulate rotation of each support rod 4, the support arm 4a of each support rod 4 can be arrange | positioned on the lower surface of the groove lid 11, respectively.

  As shown in FIGS. 7A and 7B, in the third work process, the fixed beams 8 and 8 are horizontally mounted on the left and right side groove upper ends 12 a and 12 a of the side groove body 12. At this time, as shown to FIG. 7A, the fixed beam 8 is installed on the other groove cover 11 arrange | positioned adjacently back and forth in the longitudinal direction. In addition, it is preferable to install so that the center of the longitudinal direction of the fixed beam 8 may be located directly under the bolt 6A.

As shown in FIG. 8A and FIG. 8B, in the fourth work process, the bolt 6A is advanced downward by rotating the bolt 6A at both ends in the longitudinal direction. If the bolt 6A is continuously rotated after the tip of the bolt 6A contacts the fixed beam 8, the nut 7 is relatively screwed upward instead of stopping the forward movement of the bolt 6A. 1 can be moved upward. At this time, the support rod 4 supported by the bottom plate 3 </ b> A of the plate 3 also rises together, so that the support arm 4 a of the support rod 4 contacts the lower surface of the groove lid 11 to support the groove lid 11.
Further, by rotating the front and rear bolts 6A and 6A, the groove lid 11 is lifted by the support arms 4a of the support rods 4 at the positions at both ends in the longitudinal direction. The moving distance of the movable beam 1 may be about 1 to 2 cm, and the subsequent lifting work is performed manually.

  At this time, since the fixed beam 8 is installed on the other groove lid 11 adjacent to the front and rear, the other groove lid 11 adjacent to the target groove lid 11 is lifted together with the target groove lid 11 being lifted. It is prevented. That is, only the intended groove lid 11 can be lifted.

  Then, as shown in FIG. 8B, the groove lid 11 is lifted up to a position where the lower surface of the groove lid 11 is separated from the support step 12b of the side groove main body 12. However, this distance is sufficient to be 1-2 cm, thereby forcing the solid portion. It is possible to collapse. Therefore, from this state, two workers arranged on both front and rear sides in the longitudinal direction of the groove lid 11 lift the groove lid lifting tool upward while holding the handles 2 and 2 on both sides, respectively. Can be easily removed from the gutter body 12.

FIG. 9 is a side view showing another embodiment of the groove lid lifting tool, in which A is a state before adjustment, and B is a state after adjustment.
The groove lid lifting tool shown in FIGS. 9A and 9B is different from the above-described groove lid lifting tool in that the length of the movable beam 1 is adjustable so that it can be adjusted. It is the same.

In the groove lid lifting tool shown in FIG. 9A, the movable beam 1 is divided into two, and a slender portion 1 </ b> A is formed at the tip of one movable beam 1, and a sheath portion 1 </ b> B is formed on the other movable beam 1. The slender part 1A is housed in the sheath part 1B so as to be able to advance and retreat. The slender part 1A is pulled away from each other so as to expose and extend the slender part 1A. It is possible to freely adjust the length dimension L2 (see FIG. 9A) to the adjusted length dimension L2 ′ (L2 <L2 ′) (see FIG. 9B).
Therefore, by adjusting the length L2 of the movable beam 1 according to the vertical dimension La of the groove cover 11, even the groove cover 11 having a different vertical dimension La can be supported and lifted in the same manner as described above. It is.

As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

For example, in the above embodiment, the configuration having the fixed beam 8 has been shown and described. However, as long as the front end of the bolt 6A is in contact with the upper surfaces of the front and rear groove lids 11 arranged adjacent to each other, the screw feeding function of the bolt 6A is provided. Thus, the movable beam 1 can be raised, so that the fixed beam 8 can be omitted.
However, when the adjacent groove lid 11 has already been removed, there is no member that receives the tip of the bolt 6A, and the screw feeding function by the bolt 6A is not exhibited, and the movable beam 1 cannot be raised. Therefore, in such a case, the groove lid 11 can be reliably lifted by using the fixed beam 8.

  Further, for example, in the above embodiment, the hexagon bolt 6A is used as the screw member 6. However, a screw member provided with a T-shaped or ring-shaped handle can be used instead of a hexagonal head. is there. High strength bolts may also be used. In such a screw member 6, the working speed can be increased by coarsening the screw pitch.

1; movable beam 1A; slender part 1B; sheath 1a; through hole 2; handle 3; plate 3A; bottom plate 3a; support hole 4; support rod 4a; Bolt 7; Nut 8; Fixed beam 11; Groove lid 11A; Hand cut-out hole 12; Side groove body 12a; Side groove upper end 12b; Support step L; Support arm length dimension L1; Fixed beam length dimension L2; Length of movable beam La (before adjustment); Length of groove cover (vertical dimension)
W1; width dimension Wa of the side groove main body; interval Wb between one support hole and the other support hole; horizontal width dimension of the notch hole for the handle formed in the groove lid

Claims (8)

  Similarly, a rod-shaped movable beam (1) having through holes (1a, 1a) drilled at both ends in the longitudinal direction and a pair of handles (2) fixed on both sides in the longitudinal direction of the movable beam (1), A pair of plates (3) provided on the lower surfaces of both sides of the movable beam (1), and a support that is rotatably suspended on each bottom plate (3A) of the pair of plates (3) and supports the groove lid A support rod (4) having an arm (4a); and a screw member (6, 6) inserted into the through-hole (1a, 1a) and screw-feeding the movable beam (1). Groove lid lifting tool.   The groove lid lifting device according to claim 1, further comprising a fixed beam (8) that supports the screw member (6) and raises the movable beam (1) when the tip of the screw member (6) being screwed contacts. Ingredients.   A pair of support holes (3a, 3a) are formed in each bottom plate (3A) of the plate (3), and a support rod (4) in which a round bar is bent in a crank shape is formed into the pair of support holes (3a, 3a). The groove lid lifting tool according to claim 1 or 2, which is rotatably inserted into the groove lid.   The distance (Wa) between one support hole (3a) and the other support hole (3a) is a length dimension (2) that is twice the length dimension (L) of the support arm (4a) of the support rod (4). The groove lid lifting tool according to claim 3, wherein the groove lid lifting tool has a dimension longer than L) and less than a lateral dimension (Wb) of a notch for handling (11A) formed in the groove lid (11).   The groove lid lifting tool according to claim 3 or 4, wherein a stopper for restricting the rotation of the support rod (4) is formed in the vicinity of the support hole (3a) drilled in the bottom plate (3A).   The nut (7, 7) that can be screwed to the screw member (6, 6) is fixed to both ends of the movable beam (1) so as to communicate with the through hole (1a, 1a). The groove lid lifting tool according to one item.   The groove lid lifting tool according to any one of claims 1 to 6, wherein the screw member (6) is a bolt.   The groove lid lifting tool according to any one of claims 1 to 7, wherein the length of the movable beam (1) is adjustable.

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