JP5618201B2 - Lifting method of prefabricated manhole using lifting jig for prefabricated manhole - Google Patents

Description

The present invention relates to a method for lifting a prefabricated manhole using a lifting jig for a prefabricated manhole, for example , for constructing a duct manhole by joining a plurality of prefabricated manholes at an installation place such as a concrete foundation. is there.

  For example, as shown in FIGS. 15 and 16, the conventional prefabricated manhole P is formed of a rectangular tubular concrete frame having a predetermined size and thickness. And the upper surface side, which is positioned when the prefabricated manhole P is set up, is the top wall, and four hooks F are placed on the top wall.

  When such a prefabricated manhole P is lifted and moved, for example, as shown in FIG. 16, a wire W is hung on a hook F on the top wall, and the wire W is hung by a hook K of a crane heavy machine.

  Therefore, when the prefabricated manhole P is lifted by a heavy crane and the prefabricated manhole P is placed on the transporting vehicle Q, or when the prefabricated manhole P placed on the transporting vehicle Q is lowered from the transporting vehicle Q and installed at a specific location, An operator must ascend to the top wall of the prefabricated manhole P and perform various operations.

  Specifically, when the prefabricated manhole P placed on the transport vehicle Q is lowered from the transport vehicle Q and installed in a specific place, first, as shown in FIG. The worker moves to the top wall side of the prefab manhole P through the ladder S.

  Then, as shown in FIG. 16, the worker manually connects the ends of the wires W to the four hooks F placed on the four corners of the top wall on the top wall of the prefabricated manhole P. .

  Next, the worker performs the work of hooking the wire W on the hook K of the heavy crane on the top wall, lifts the prefabricated manhole P placed on the loading platform of the transport vehicle Q by the heavy crane, and installs it at a specific location. It is.

  On the other hand, as disclosed in Patent Document 1, there is a rectangular tube-shaped box culvert in which convex portions and concave portions for dropping the upper portion are formed at the front and rear ends, respectively. Also in this box culvert, since two hooks F are driven on the top wall (see FIG. 1 of Patent Document 1), the worker has to rise to the top wall and perform various operations. Is exactly the same as in the case of the prefabricated manhole P shown in FIGS.

  In addition, in the prefabricated manhole P, after being lifted and transferred to a predetermined installation location, the prefabricated manhole P is installed at a predetermined position of the concrete foundation, and the next prefabricated manhole P is installed on the foundation so as to be adjacent thereto. Then, it is necessary to move it in the horizontal direction and join it to the end face of the prefabricated manhole P that has already been installed.

  When the prefabricated manhole P is moved in the horizontal direction (horizontal pulling) and there is a cut beam H near the ground above the prefabricated manhole P, the wire W lifting the prefabricated manhole P Since it hits the beam H, measures to avoid the cut beam H are required.

  However, in the past, when the horizontal movement (lateral pulling) of the prefabricated manhole P at the installation location has not been devised to avoid the cut beam H, the prefabricated manhole P is lifted by the wire W. As it is, it is difficult to move the prefabricated manhole P in the horizontal direction (laterally pull) and join it to the end face of the prefabricated manhole P that has already been installed.

  Therefore, as a measure of bitterness, the prefabricated manhole P is lowered, and all the ends of the four wires W that lift the prefabricated manhole P are separated from the four hooks F placed on the top wall of the prefabricated manhole P, respectively. It was removed and the prefabricated manhole P itself was moved (laterally pulled) in the horizontal direction.

  Specifically, for example, as shown in FIG. 17, the four wires W lifting the prefabricated manhole P are removed while the prefabricated manhole P is placed on the moving steel rod T. Then, a plurality of workers push the prefabricated manhole P strongly from one side using a tool such as a bar to move the prefabricated manhole P together with the moving steel rod T in the horizontal direction (lateral pulling).

Japanese Patent No. 2665164

  However, in the prior art, as shown in FIGS. 15 and 16, an operator climbs the top wall of the prefabricated manhole P using a ladder S, and hooks F placed at the four corners of the top wall at the ends of the wires W. The work which connects a part and the work which hooks the wire W to the hook K of a heavy crane of a crane must be implemented, but the member which can hang a worker's safety belt on the top wall part of the prefab manhole P and its circumference Does not exist at all.

  Therefore, either when the worker ascends the ladder S, when the end of the wire W is connected to the hook F on the top wall of the prefabricated manhole P, or when the wire W is hooked on the hook K of a crane heavy machine. However, the safety of the worker is not ensured, so that it becomes a so-called unwound rope state.

  As a result, there has always been a risk that an operator may fall from the ladder S or the top wall of the prefabricated manhole P which is relatively high.

  The box culvert disclosed in Patent Document 1 is completely the same as the fact that there is a risk that the worker will fall due to such a state of the unwound rope of the worker.

  In addition, in order to eliminate the involuntary state of the worker and ensure the safety of the worker, for example, a master rope for hanging the safety belt of the worker on the transport vehicle Q carrying the prefabricated manhole P is provided. There are measures to install a jig to be stretched, but since the installation cost is high, the fact is that it is hardly adopted.

  In addition, when the prefabricated manhole P is moved (laterally pulled) in the horizontal direction and the cut beam H is present near the ground above the prefabricated manhole P, in order to avoid the cut beam H, as shown in FIG. In addition, with the prefabricated manhole P placed on the moving steel rod T, all the wires W lifting the prefabricated manhole P are removed, and a plurality of workers use a tool such as a bar to remove the prefabricated manhole P from one side. If pushed in too strongly, there is a risk that the prefabricated manhole P will fall over.

  That is, as shown in FIG. 17, when the prefabricated manhole P is placed on the moving steel rod T, the prefabricated manhole P faces its own internal space in the moving direction of the moving steel rod T. Therefore, when the pushing force by the worker acts on the bottom wall in contact with the moving steel rod T in the direction perpendicular to the longitudinal direction of the bottom wall, if the pushing force is strong, the ceiling of the prefabricated manhole P The wall falls to the worker side.

  Further, in Patent Document 1, the point of action of the resultant force of a pair of hooks provided on the top plate of a box culvert formed by forming a convex part and a concave part for dropping the upper part at the front and rear ends is greater than the position of the center of gravity of the box culvert. It is eccentric by the distance e on the convex side, and when it is lifted by a crane or the like, the box culvert is not horizontal and is inclined to the concave side, and in this state, another box culvert is joined to the existing box culvert. The description of exists.

  However, in Patent Document 1, when the prefabricated manhole P is moved (laterally pulled) in the horizontal direction, when the cut beam H is present near the ground above the prefabricated manhole P, a measure for avoiding the cut beam H is disclosed. Is not described at all.

  Therefore, the present invention was created in view of the existing circumstances as described above, and the anchors are attached to positions at a height that can be reached by workers on each of the left and right side walls constituting the prefabricated manhole. Accordingly, the first object is to eliminate the danger of the worker falling from the prefabricated manhole by eliminating the various operations of the worker on the top wall of the prefabricated manhole.

  Further, according to the present invention, when the prefabricated manhole is moved in the horizontal direction (horizontal pulling), two beams are attached to both ends of the horizontal member and the horizontal member even when there are cut beams near the ground of the installation place. The prefabricated manhole is lifted by the wire, and if necessary, the prefabricated manhole is lowered to the ground, and the wire is attached to and removed from the prefabricated manhole as appropriate, thereby preventing the prefabricated manhole from falling and avoiding the beam. The purpose of 2.

A lifting tool for a prefabricated manhole for lifting a prefabricated manhole formed in a square tube shape through an anchor attached to the prefabricated manhole. A prefabricated manhole using a lifting tool for prefabricated manholes, which is composed of two wires attached to both ends, each of which has a hooking body that hooks onto the anchor of the prefabricated manhole. In the lifting method described above, the anchors of the prefabricated manholes are spaced apart from each other on the left and right side walls constituting the prefabricated manholes at positions above the center of gravity of the prefabricated manholes and at a height that can be reached by workers. Open with two anchors attached horizontally Moving the blanking manhole in the horizontal direction (lateral pulling) case, if the direction of movement, the wire that lifting the prefabricated manhole will hit the Setsuhari, in order to avoid the Setsuhari,
A step of lowering the prefabricated manhole to the ground in a state where the two wires located on the moving direction side of the prefabricated manhole are close to the beam,
Removing the hooks of the two wires located on the moving direction side of the prefabricated manhole from the anchor of the prefabricated manhole;
A step of moving the two wires forward so as to straddle the beam, and again hooking the hooks of the two wires on the anchors of the prefabricated manhole,
Lifting the prefabricated manhole, moving it slightly forward, and lowering the prefabricated manhole to the ground with the two wires on the other side of the prefabricated manhole in close proximity to the beam,
Removing the hooks of the other two wires adjacent to the beam from the anchor of the prefabricated manhole;
Moving the two wires on the other side forward so as to straddle the cut beam, and re-hanging the hooks of the other two wires on the anchor of the prefabricated manhole;
The above-mentioned problem has been solved by lifting the prefabricated manhole using a lifting tool for the prefabricated manhole, which performs the step of lifting the prefabricated manhole and moving it forward.

Furthermore, it is a lifting tool for a prefabricated manhole for lifting a prefabricated manhole formed in a rectangular tube shape through an anchor attached to the prefabricated manhole, and a horizontal member that lifts using a crane heavy machine, A lifting jig for prefabricated manholes is used, which is composed of two wires attached to both ends of each member, and each of the wire ends is provided with a latching body that latches on the anchor of the prefabricated manhole. In the lifting method of the prefabricated manhole, in the rectangular top wall constituting the prefabricated manhole, an anchor is attached to each of the central portions of a pair of short sides forming the top wall, and one diagonal portion forming the top wall Both ends of the horizontal member when anchors are attached to each of the Using two attached wires, hook the two wire hooks on the anchors located near the center of the pair of short sides that form the top wall of the prefabricated manhole. When moving the prefabricated manhole in the horizontal direction (lateral pulling), if the wire lifting the prefabricated manhole hits the cutting beam in that moving direction, in order to avoid the cutting beam,
The process of lowering the prefabricated manhole to the ground with two wires in close proximity to the beam,
A step of removing a latching body that is latched to an anchor located in the vicinity of the center part of a pair of short sides forming the top wall of the prefabricated manhole from the anchor of the prefabricated manhole,
One hanging body is hooked to the anchor located on one side of the diagonal part forming the top wall, the other hanging body is moved forward so as to straddle the beam, and the top wall is A step of hooking on an anchor located on the other side of the diagonal portion to be formed,
With the horizontal member placed diagonally so as to intersect the beam, the prefabricated manhole is lifted and moved slightly forward and hooked to the anchor located on one side of the diagonal that forms the top wall. The process of lowering the prefabricated manhole to the ground with one of the wires in close proximity to the cutting beam,
Removing a latching body that is latched to each anchor located at a diagonal portion that forms the top wall;
Move one latching body, which was latched on the anchor located on one side of the diagonal part forming the top wall, forward so as to straddle the beam, and connect both latching bodies to the prefabricated manhole. Re-hanging on the anchors located near the center of the pair of short sides forming the top wall,
The above-mentioned problem has been solved by lifting the prefabricated manhole using a lifting tool for the prefabricated manhole, which performs the step of lifting the prefabricated manhole and moving it forward.

  According to the lifting jig for a prefabricated manhole according to the present invention, it is possible to eliminate the various operations of the worker on the top wall of the prefabricated manhole and eliminate the risk that the worker falls from the prefabricated manhole.

  Specifically, for the prefabricated manhole itself to be lifted, two left and right side wall portions above the center of gravity of the prefabricated manhole and at a height that can be reached by the operator's hand, are separated by two pieces. Since the anchor is attached horizontally, there is no need for the worker to climb to the top wall of the prefabricated manhole when connecting the end of the wire to the anchor.

  Therefore, the situation where an operator falls from the top wall of the prefab manhole does not occur in the first place.

  Similarly, since the ladder is not used, a situation where the worker falls from the ladder does not occur.

  Moreover, since the lifting jig is composed of a horizontal member that is lifted using a heavy crane and two wires attached to both ends of the horizontal member, the prefabricated manhole is stabilized by the horizontal member and the wire. Can be lifted in a state.

  Furthermore, since the front-end | tip part of a wire is equipped with the latching body latched on the anchor of a prefabricated manhole, attachment of a latching body to an anchor and removal of a latching body from an anchor are easy.

  Further, the horizontal member is formed by a substantially rectangular plate piece that is longer than the width of the left and right side wall portions constituting the prefabricated manhole, and the end of the wire is in a state where the wire is straightly lowered at both ends of the plate piece. Since the portion is connected to the anchor fixed to the left and right side wall portions, the prefabricated manhole can be lifted in a stable state.

  In addition, the substantially rectangular plate pieces are arranged so that the short sides thereof stand up, and reinforcing ribs are provided on both side surfaces in the longitudinal direction of the plate pieces. Robustness can be maintained.

  Therefore, the heavy prefabricated manhole can be reliably lifted through the horizontal member, and the occurrence of a situation where the prefabricated manhole falls due to breakage of the horizontal member can be reliably prevented.

In addition, the anchor attached to the prefabricated manhole is formed by attaching a thin plate-shaped head to the tip of the rod of a predetermined length, and the base end of the rod is attached to the side wall of the prefabricated manhole. It is fixed to the recess that is provided,
The hook of the wire to be hooked on the anchor is composed of a connecting piece attached to the tip of the wire and having a substantially circular hole at the end, and a hollow annular coupler rotatably attached to the hole of the connecting piece. Configured,
An opening for inserting the head of the anchor is provided on the peripheral surface of the coupler, and a narrow slot is continuously provided in this opening. Therefore, the opening of the coupler is directed to the head of the anchor. By introducing the head of the anchor into the coupler, rotating the coupler so that the long hole of the coupler moves upward, and engaging the head of the anchor with the long hole of the coupler, to the anchor of the prefabricated manhole, It is possible to easily attach the hook of the wire.

  Further, when the prefabricated manhole is lifted by the wire, the anchor head always engages with the narrow elongated hole of the coupler, so that the coupler does not come off from the anchor head.

  Further, when removing the wire hook from the anchor of the prefabricated manhole, the coupler is rotated so that the long hole of the coupler moves downward in a state where the prefabricated manhole is lowered. Then, the long hole of the coupler engaged with the anchor head is moved, and the opening of the coupler is arranged at the position of the anchor head. The coupler can be easily removed from the head of the anchor through the opening of the coupler.

  Further, since the claw portion is provided adjacent to the opening of the coupler, the rotation operation of the coupler is very easy through this claw piece.

  In addition, in the prefabricated manhole lifting method according to the present invention, the anchor of the prefabricated manhole can reach the operator's hand above the position of the center of gravity of the prefabricated manhole in each of the left and right side walls constituting the prefabricated manhole. Since the prefabricated manhole is lifted by using a lifting tool for the prefabricated manhole against the prefabricated manhole in which two anchors are mounted horizontally at a predetermined interval at a height, the top of the prefabricated manhole is By eliminating the various operations of the worker on the wall, it is possible to eliminate the risk that the worker will fall from the prefabricated manhole.

Further, the anchor of the prefabricated manhole is spaced at a predetermined interval at a position above the center of gravity of the prefabricated manhole and at a height that can be reached by the operator in each of the left and right side walls constituting the prefabricated manhole. When moving the prefabricated manhole where the anchors are attached horizontally (horizontal pulling), if the wire that lifts the prefabricated manhole hits the cutting beam in that moving direction,
A step of lowering the prefabricated manhole to the ground in a state where the two wires located on the moving direction side of the prefabricated manhole are close to the beam,
Removing the hooks of the two wires located on the moving direction side of the prefabricated manhole from the anchor of the prefabricated manhole;
A step of moving the two wires forward so as to straddle the beam, and again hooking the hooks of the two wires on the anchors of the prefabricated manhole,
Lifting the prefabricated manhole, moving it slightly forward, and lowering the prefabricated manhole to the ground with the two wires on the other side of the prefabricated manhole in close proximity to the beam,
Removing the hooks of the other two wires adjacent to the beam from the anchor of the prefabricated manhole;
Moving the two wires on the other side forward so as to straddle the cut beam, and re-hanging the hooks of the other two wires on the anchor of the prefabricated manhole;
By carrying out a process of lifting the prefabricated manhole and moving it forward, the cut beam can be avoided.

  As a result, it is possible to move the prefabricated manhole in the horizontal direction (lateral pulling) while avoiding the cut beam, and it is possible to easily join another prefabricated manhole to the end face of the prefabricated manhole already installed. it can.

  In addition, when the prefabricated manhole is moved horizontally (laterally pulled), two of the four wires are always connected to the anchor of the prefabricated manhole in the prefabricated manhole that is lowered to the ground. The prefabricated manhole that has been lowered to the ground is reliably prevented from falling.

  Further, the horizontal member is formed by a substantially rectangular plate piece that is longer than the width of the left and right side walls constituting the prefabricated manhole, and at the end of the horizontal member, the end of the wire is lowered straightly. The part is connected to an anchor fixed to the side wall of the prefabricated manhole.

  For this reason, the process of removing the two wire latches located on the moving direction side from the anchor of the prefabricated manhole and the two wires are moved forward so as to straddle the beam. It is possible to easily carry out the step of latching the latching body again on the anchor of the prefabricated manhole.

  In addition, the process of removing the hooks of the two wires located on the other side from the anchor of the prefabricated manhole, and the two wires are moved forward so as to straddle the cut beam. The process of latching the stop on the anchor of the prefabricated manhole can be easily carried out, and the beam can be avoided.

  Thus, even when moving the prefabricated manhole in the horizontal direction (lateral pulling), the prefabricated manhole is lifted using the anchor attached to the side wall of the prefabricated manhole, but in the place where the prefabricated manhole is installed, If the space is very narrow and it is difficult for workers to remove the wire latching body from the anchor near the side wall of the prefabricated manhole and lock it to the anchor, the prefabricated manhole is constructed. It is recommended that an anchor be attached to the ceiling wall.

  Specifically, in the rectangular top wall constituting the prefabricated manhole, an anchor is attached to each of the vicinity of the center part of the pair of short sides forming the top wall, and each of the diagonal parts forming the top wall is provided. The anchor is attached to the.

Then, using two wires attached to both ends of the horizontal member, the hooks of the two wires are positioned in the vicinity of the center of the pair of short sides forming the top wall of the prefabricated manhole. When the prefabricated manhole is moved horizontally by pulling it on the anchor (lateral pulling), the wire lifting the prefabricated manhole hits the cut beam in the moving direction.
The process of lowering the prefabricated manhole to the ground with two wires in close proximity to the beam,
A step of removing a latching body that is latched to an anchor located in the vicinity of the center part of a pair of short sides forming the top wall of the prefabricated manhole from the anchor of the prefabricated manhole,
One hanging body is hooked to the anchor located on one side of the diagonal part forming the top wall, the other hanging body is moved forward so as to straddle the beam, and the top wall is A step of hooking on an anchor located on the other side of the diagonal portion to be formed,
With the horizontal member placed diagonally so as to intersect the beam, the prefabricated manhole is lifted and moved slightly forward and hooked to the anchor located on one side of the diagonal that forms the top wall. The process of lowering the prefabricated manhole to the ground with one of the wires in close proximity to the cutting beam,
Removing a latching body that is latched to each anchor located at a diagonal portion that forms the top wall;
Move one latching body, which was latched on the anchor located on one side of the diagonal part forming the top wall, forward so as to straddle the beam, and connect both latching bodies to the prefabricated manhole. Re-hanging on the anchors located near the center of the pair of short sides forming the top wall,
By carrying out the step of lifting the prefabricated manhole and moving it forward, the beam can be avoided.

It is a perspective view which shows the state which has lifted the prefabricated manhole through the horizontal member. It is a front view which shows the state which has lifted the prefabricated manhole through the horizontal member. It is a disassembled perspective view which shows the state which latches the coupler as a latching body on the anchor currently fixed in the hollow part provided in the side wall part of a prefabricated manhole. It is a perspective view which shows the state which latched the coupler as a latching body on the anchor currently fixed in the hollow part provided in the side wall part of the prefabricated manhole. FIG. 6A shows the state of attachment of a latching body to an anchor. (A) introduces the anchor head into the coupler by directing the opening of the coupler as the latching body to the anchor head. An exploded perspective view showing the state, (b) is a perspective view showing a state where the anchor head is introduced into the coupler, and (c) is a state where the coupler is rotated so that the anchor head is engaged with the long hole of the coupler. FIG. FIG. 6A shows the state of attachment of a latching body to an anchor. (A) introduces the anchor head into the coupler by directing the opening of the coupler as the latching body to the anchor head. (B) is a cross-sectional view showing a state where the anchor head is introduced into the coupler, and (c) is a state where the coupler is rotated to engage the anchor head with the long hole of the coupler. FIG. It is a perspective view which shows the state which mounted the prefabricated manhole on the loading platform of a transport vehicle using the lifting jig for prefabricated manholes. In the outline side view explaining the situation where the wire that lifts the prefabricated manhole hits the cutting beam in the moving direction when joining the endface of the new prefabricated manhole to the end surface of the prefabricated manhole already installed is there. It is the schematic side view explaining the procedure which moves a prefabricated manhole to a horizontal direction (horizontal pulling), avoiding a cut beam using the anchor attached to the side wall part of a prefabricated manhole. It is a perspective view which shows the state which attached the anchor to each of one diagonal part which forms a top wall while attaching an anchor to each center vicinity of a pair of short side which forms the top wall of a prefabricated manhole. It is a perspective view which shows the state which has latched the latching body of two wires on the anchor located in the center part vicinity of a pair of short side which forms the top wall of a prefabricated manhole. It is a perspective view which shows the state which has latched the latching body of two wires on the anchor located in each of the one diagonal part which forms the top wall of a prefabricated manhole. It is the perspective view explaining the procedure (first half) which moves a prefabricated manhole to a horizontal direction, avoiding a cut beam using the anchor attached to the top wall of a prefabricated manhole (horizontal drawing). It is the perspective view explaining the procedure (second half) which moves a prefabricated manhole to a horizontal direction, avoiding a cut beam using the anchor attached to the top wall of a prefabricated manhole (horizontal drawing). It is a perspective view which shows the state which the worker has climbed to the prefab manhole through the ladder. It is a perspective view which shows the state in which the worker is performing various work on the top wall of a prefabricated manhole. FIG. 5 is a perspective view showing a state where the prefabricated manhole falls when all the wires lifting the prefabricated manhole are removed and the prefabricated manhole is pushed firmly from one side with the prefabricated manhole placed on the moving steel rod. .

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the lifting jig 1 for the prefabricated manhole P according to the present invention is located above the center of gravity of the prefabricated manhole P in each of the left and right side walls constituting the prefabricated manhole P. A prefabricated manhole P having a structure in which two anchors 2 are horizontally mounted with a predetermined interval at a position where a worker's hand can reach is lifted.

  The prefabricated manhole lifting jig 1 that lifts the prefabricated manhole P having such a structure includes a horizontal member 11 that is lifted by using a crane heavy machine, and both ends of the horizontal member 11 as shown in FIGS. Each of the wires W is provided with a hook body 3 that is hooked on the anchor 2 of the prefabricated manhole P.

  As shown in FIG. 3, the prefabricated manhole P is provided with recesses 4 that are formed in a substantially semispherical shape at two horizontal positions on the left and right side walls. As shown in FIGS. 2 and 3, the anchor 2 is fixed in the center of the back of the recess 4. As shown in FIG. 5A, the anchor 2 includes thin circular heads 2b at both ends of the rod 2a. As shown in FIG. 6A, one head 2 b of the anchor 2 is embedded in the side wall, and the other head 2 b protrudes into the recess 4.

  The depression 4 and the anchor 2 of the prefabricated manhole P are located above the center of gravity of the prefabricated manhole P on the side wall of the prefabricated manhole P and reach a worker's hand (for example, about 1 m to 1.5 m from the bottom surface). Is arranged at the height of

  Moreover, the horizontal member 11 which lifts the prefabricated manhole P is formed by a substantially rectangular plate piece longer than the width of the left and right side walls constituting the prefabricated manhole P, as shown in FIGS. The plate pieces are arranged so as to stand upright, and reinforcing ribs 12 are provided on both side surfaces in the longitudinal direction of the plate pieces.

  Further, as shown in FIGS. 1 and 2, one mounting hole 13 a is provided above each of both end portions of the horizontal member 11. Two attachment holes 13b are provided below.

  The ends of the two wires W hung on the hooks K of the heavy crane are connected to the upper mounting hole 13a. In addition, in the two lower mounting holes 13b, two wires W that lift the prefabricated manhole P are connected to the inner mounting hole 13b. The two wires W are connected to the mounting hole 13b via a closed inverted U-shaped mounting jig V that is latched to the mounting hole 13b.

  In addition, the hook body 3 is connected to the other ends of the two wires W via a predetermined mounting jig V.

  As shown in FIGS. 4 and 5, the latching body 3 latches on the anchor 2 fixed in the recess 4 provided in the side wall portion constituting the prefabricated manhole P.

  As shown in FIGS. 1 and 3 (a) and 3 (b), the hooking body 3 is rotatably attached to the connection piece 3c connected to the ring member in the attachment jig V of the wire W and the connection piece 3c. It is constituted by a coupler 3a.

  As shown in FIGS. 3A and 3B, the connection piece 3c is formed in a substantially rectangular plate material, and a rectangular opening 3g is provided on the entire base end side portion. A ring member engaged with the attachment jig V is attached to the opening 3g. Further, a substantially circular hole 3f is provided at the tip of the connection piece 3c. A coupler 3a is rotatably attached to the hole 3f.

  As shown in FIGS. 5A and 6A, the coupler 3a is formed in a hollow annular shape as a whole. An opening 5 for introducing the head 2b of the anchor 2 is provided on the peripheral surface of the hollow annular coupler 3a, and a narrow slot 6 is continuously provided in the opening 5.

  The hollow annular coupler 3a is large enough to rotate along the inner peripheral surface of the recess 4 provided in the side wall of the prefabricated manhole P. Further, a claw portion 3 e is provided on the peripheral surface of the coupler 3 a so as to be adjacent to the opening 5.

  The opening portion 5 of the coupler 3a is intended to introduce the head portion 2b of the anchor 2 into the coupler 3a with the opening portion 5 of the coupler 3a being directed to the head portion 2b of the anchor 2. The narrow slot 6 of the coupler 3a engages the head 2b of the anchor 2 in the slot 6 to prevent the coupler 3a from being detached from the head 2b of the anchor 2.

  As shown in FIGS. 3 and 4, when the coupler 3a is attached to the anchor 2 fixed in the hollow portion 4 provided in the side wall portion constituting the prefabricated manhole P, first, as shown in FIG. 6 (a) and 6 (b), the opening 2 of the coupler 3a is directed to the head 2b of the anchor 2, and the head 2b of the anchor 2 is introduced into the coupler 3a. .

  Next, the claws 3e are picked and the coupler 3a is rotated so that the long hole 6 of the coupler 3a moves upward. As shown in FIGS. 5 (c) and 6 (c), the long hole of the coupler 3 is obtained. 6 is engaged with the head 2 b of the anchor 2. When the prefabricated manhole P is lifted by the wire W, the head 2b of the anchor 2 is always kept engaged with the narrow long hole 6 of the coupler 3a. Will not come off.

  On the other hand, when removing the coupler 3a from the anchor 2 of the prefabricated manhole P, first, the prefabricated manhole P is lowered to the ground or the like. Then, the claws 3e of the coupler 3a in the state shown in FIGS. 5C and 6C are picked, and the coupler 3a is rotated so that the long hole 6 of the coupler 3a moves downward. Then, the elongated hole 6 of the coupler 3a engaged with the head 2b of the anchor 2 is moved, and the opening 5 of the coupler 3a is moved to the position of the head 2b of the anchor 2 as shown in FIG. To place. The coupler 3a is detached from the head 2b of the anchor 2 through the opening 5 of the coupler 3a.

  When lifting the prefabricated manhole P using the lifting jig 1 for the prefabricated manhole P according to the present invention, as shown in FIGS. 1 and 2, the two wires hung on the hook K of the crane heavy machine are used. W is connected to both end portions of the horizontal member 11, and the two wires W are straightly lowered at each end portion of the horizontal member 11, and the hook body 3 is connected to the two wires W. The coupler 3a is attached to the head 2b of the anchor 2 in the recess 4 provided in the left and right side walls of the prefabricated manhole P.

  In this state, the crane heavy machine is operated to lift the prefabricated manhole P existing below the hook K through the horizontal member 11. Then, for example, as shown in FIG. 7, the prefabricated manhole P is placed on the loading platform of the transport vehicle Q.

  Next, the horizontal member 11 is slightly lowered, and the coupler 3a as the latching body 3 is removed from the head 2b of the anchor 2 in the recess 4 provided in the left and right side walls of the prefabricated manhole P.

  Then, measures are taken to fix the prefabricated manhole P to the loading platform of the transporting vehicle Q, and the prefabricated manhole P is transported by the transporting vehicle Q.

  Next, when the prefabricated manhole P is moved from the loading platform of the transport vehicle Q, for example, as shown in FIG. The anchor 2 in the hollow portion 4 provided on the left and right side wall portions of the prefabricated manhole P with the coupler 3a as the hook body 3 connected to the two wires W is lowered straightly downward. Reattach to the head 2b.

  In this state, the crane heavy machine is operated, and the prefabricated manhole P existing below the hook K is lifted through the horizontal member 11.

  Hereinafter, in the lifting method for the prefabricated manhole P using the lifting jig 1 for the prefabricated manhole P, a specific process of moving the prefabricated manhole P in the horizontal direction while avoiding the cut beam H (lateral pulling) is described below. explain.

  In the movement (lateral pulling) of the prefabricated manhole P in the horizontal direction, for example, as shown in FIG. 8, when the end face of the new prefabricated manhole P is joined to the end face of the prefabricated manhole P already installed. In the moving direction, the wire W lifting the prefabricated manhole P may hit the cut beam H.

  Each process shown below is a procedure for moving the prefabricated manhole P in the horizontal direction while avoiding the cut beam H (lateral pulling).

  First, as shown in FIGS. 9A and 9B, the prefabricated manhole P is moved in the horizontal direction, and the two wires W positioned on the moving direction side where the prefabricated manhole P is lifted are cut beams. When approaching H, the prefabricated manhole P is lowered to the ground.

  Next, as shown in FIG. 9C, the hooks 3 of the two wires W positioned on the moving direction side of the prefabricated manhole P are removed from the anchor 2 of the prefabricated manhole P.

  Next, as shown in FIGS. 9C and 9D, the two wires W located on the moving direction side are moved forward so as to straddle the cutting beam H, and the two wires W are hooked. The stop 3 is again hooked on the anchor 2 of the prefabricated manhole P.

  Next, as shown in FIGS. 9D, 9E and 9F, the prefabricated manhole P is lifted and moved forward, and the two wires W positioned on the other side of the prefabricated manhole P are In the state close to the cut beam H, the prefabricated manhole P is lowered to the ground.

  Next, as shown in FIG. 9 (g), the hooks 3 of the two wires W positioned on the other side close to the cut beam H are removed from the anchor 2 of the prefabricated manhole P.

  Next, as shown in FIGS. 9 (g) and 9 (h), the two wires W located on the other side are moved forward so as to straddle the cutting beam H, and the two wires W are latched. The body 3 is again hooked on the anchor 2 of the prefabricated manhole P.

  Finally, as shown in FIGS. 9H and 9I, the prefabricated manhole P is lifted, moved forward, and installed at a predetermined location.

  By carrying out such a process, it becomes possible for the wire W to move the prefabricated manhole P in the horizontal direction while avoiding the cut beam H (lateral pulling), and to the end face of the prefabricated manhole P already installed, The prefabricated manhole P can be easily joined.

  In addition, when the prefabricated manhole P is moved in the horizontal direction (horizontal pulling), in the prefabricated manhole P in a state of being lowered to the ground, two of the four wires W are always in the prefabricated manhole P. Since it is connected to the anchor 2, the occurrence of a situation in which the prefabricated manhole P falls over is reliably prevented.

  Thus, even when the prefabricated manhole P is moved in the horizontal direction while avoiding the cut beam H (lateral pulling), the prefabricated manhole P is lifted by using the anchor 2 attached to the side wall portion of the prefabricated manhole P. However, in the place where the prefabricated manhole P is installed, the width space is very narrow, and the worker removes the hooking body 3 of the wire W from the anchor 2 in the vicinity of the side wall portion of the prefabricated manhole P. When it is difficult to carry out the work of hanging, the anchor 2 may be attached to the top wall constituting the prefabricated manhole P.

  Specifically, as shown in FIG. 10, in the rectangular ceiling wall constituting the prefabricated manhole P, the anchor 2 is attached to each of the vicinity of the center part of the pair of short sides forming the ceiling wall, and the ceiling wall is The anchor 2 is attached to each of the diagonal portions to be formed.

  The anchor 2 may be attached to each of the other diagonal portions forming the top wall.

  Then, as shown in FIG. 11, the prefabricated manhole P is lifted using only two wires W out of a total of four wires W attached to both ends of the horizontal member 12 two by two.

  In FIG. 11 to FIG. 14, only two wires W are shown for clarity of explanation.

  Then, as shown in FIG. 11, the hooks 3 of the two wires W are hooked on the anchors 2 located near the central portions of the pair of short sides forming the top wall of the prefabricated manhole P. As shown in FIG. 12, the hooks 3 of the two wires W are hooked on the anchors 2 positioned at one of the diagonal portions forming the top wall. The prefabricated manhole P is moved in the horizontal direction while maintaining the state appropriately and avoiding the cut beam H (lateral pulling).

  Specifically, first, as shown in FIG. 13 (a), the hooking body 3 of the two wires W is positioned in the vicinity of the center part of the pair of short sides forming the top wall of the prefabricated manhole P. The prefabricated manhole P is moved in the horizontal direction by being hooked on the anchor 2 (lateral pulling).

  Then, as shown in FIG. 13B, the prefabricated manhole P is lowered to the ground in a state where the two wires W are close to the cut beam H.

  Next, the hooks 3 that are hooked on the anchors 2 located near the central portions of the pair of short sides forming the top wall of the prefabricated manhole P are removed from the anchors of the prefabricated manhole.

  Next, as shown in FIG.13 (c), one latching body 3 is latched by the anchor 2 located in the one side of the diagonal part which forms a top wall, and the other latching body 3 is attached. Is moved forward so as to straddle the cutting beam H, and is hooked on the anchor 2 located on the other side of the diagonal portion forming the top wall.

  Then, in a state in which the horizontal member 11 is arranged obliquely so as to intersect with the cut beam H, the prefabricated manhole P is lifted and moved slightly forward as shown in FIG. The prefabricated manhole P is lowered to the ground in a state where one wire W hooked on the anchor 2 located on one side of the corner is close to the cut beam H.

  Next, the hooks 3 that are hooked to the respective anchors 2 positioned at the diagonal portions that form the top wall are removed, and the diagonals that form the top wall as shown in FIG. 14B. One latching body 3 latched on the anchor 2 located on one side of the part is moved forward so as to straddle the cross beam H, and both the latching bodies 3 are moved to the top wall of the prefabricated manhole P. Are again hooked on the anchors 2 located near the center of the pair of short sides.

  In this state, as shown in FIG. 14C, the prefabricated manhole P is lifted and moved forward, and the prefabricated manhole P is moved in the horizontal direction while avoiding the cut beam H (lateral pulling).

  It should be noted that the present invention is not limited to the above-described embodiment, and all the improvements and modifications within the scope that can achieve the object of the present invention are included in the present invention.

  In addition to being used for laying and constructing pipe manholes by installing a plurality of prefabricated manholes at installation locations such as concrete foundations, the present invention provides a lifting treatment for laying and constructing various structures. It can be widely used as a tool and lifting method.

P ... Prefabricated manhole Q ... Transport vehicle S ... Ladder T ... Moving steel rod K ... Hook F ... Hook W ... Wire 1 ... Lifting jig 2 ... Anchor 2a ... Rod body 2b ... Head 3 ... Suspension body 3a ... Coupler 3c ... Connection piece 3e ... Claw part 3f ... Hole 3g ... Opening part 4 ... Depression part 5 ... Opening part 6 ... Long hole

Claims (2)

A lifting tool for a prefabricated manhole for lifting a prefabricated manhole formed in a square tube shape through an anchor attached to the prefabricated manhole. A prefabricated manhole using a lifting tool for prefabricated manholes, which is composed of two wires attached to both ends, each of which has a hooking body that hooks onto the anchor of the prefabricated manhole. In the lifting method of
The anchors of the prefabricated manhole are two spaced apart from each other on the left and right side walls constituting the prefabricated manhole at positions above the center of gravity of the prefabricated manhole and at a height that can be reached by workers. When moving the prefabricated manhole to which the anchor is attached horizontally (lateral pulling), if the wire that lifts the prefabricated manhole hits the cutting beam in that moving direction, in order to avoid the cutting beam,
A step of lowering the prefabricated manhole to the ground in a state where the two wires located on the moving direction side of the prefabricated manhole are close to the beam,
Removing the hooks of the two wires located on the moving direction side of the prefabricated manhole from the anchor of the prefabricated manhole;
A step of moving the two wires forward so as to straddle the beam, and again hooking the hooks of the two wires on the anchors of the prefabricated manhole,
Lifting the prefabricated manhole, moving it slightly forward, and lowering the prefabricated manhole to the ground with the two wires on the other side of the prefabricated manhole in close proximity to the beam,
Removing the hooks of the other two wires adjacent to the beam from the anchor of the prefabricated manhole;
Moving the two wires on the other side forward so as to straddle the beam, and hooking the hooks of the other two wires on the anchor of the prefabricated manhole again,
A method of lifting a prefabricated manhole using a lifting tool for a prefabricated manhole, wherein the prefabricated manhole is lifted and moved forward. A lifting tool for a prefabricated manhole for lifting a prefabricated manhole formed in a square tube shape through an anchor attached to the prefabricated manhole. A prefabricated manhole using a lifting tool for prefabricated manholes, which is composed of two wires attached to both ends, each of which has a hooking body that hooks onto the anchor of the prefabricated manhole. In the lifting method of
In the rectangular ceiling wall that constitutes the prefabricated manhole, the anchor is attached to each of the central portions of the pair of short sides forming the ceiling wall, and the anchor is attached to each of the diagonal portions forming the ceiling wall. When using the two wires attached to both ends of the horizontal member, the hooks of the two wires are respectively attached to the vicinity of the center of the pair of short sides forming the top wall of the prefabricated manhole. To move the prefabricated manhole in the horizontal direction by hanging it on the anchor that is positioned (lateral pulling), if the wire that lifts the prefabricated manhole hits the cut beam in that moving direction, to avoid the cut beam ,
The process of lowering the prefabricated manhole to the ground with two wires in close proximity to the beam,
A step of removing a latching body that is latched to an anchor located in the vicinity of the center part of a pair of short sides forming the top wall of the prefabricated manhole from the anchor of the prefabricated manhole,
One hanging body is hooked to the anchor located on one side of the diagonal part forming the top wall, the other hanging body is moved forward so as to straddle the beam, and the top wall is A step of hooking on an anchor located on the other side of the diagonal portion to be formed,
With the horizontal member placed diagonally so as to intersect the beam, the prefabricated manhole is lifted and moved slightly forward and hooked to the anchor located on one side of the diagonal that forms the top wall. The process of lowering the prefabricated manhole to the ground with one of the wires in close proximity to the cutting beam,
Removing a latching body that is latched to each anchor located at a diagonal portion that forms the top wall;
Move one latching body, which was latched on the anchor located on one side of the diagonal part forming the top wall, forward so as to straddle the beam, and connect both latching bodies to the prefabricated manhole. Re-hanging on the anchors located near the center of the pair of short sides forming the top wall,
A method of lifting a prefabricated manhole using a lifting tool for a prefabricated manhole, wherein the prefabricated manhole is lifted and moved forward.

Images