JP6060693B2 - Construction method of Telha crane and pneumatic caisson - Google Patents

Description

  The present invention relates to a construction method for a Telha crane and a pneumatic caisson.

  In the construction of the pneumatic caisson, the earth and sand bucket is reciprocated through the material shaft and the material lock by a crane between the work room at the bottom of the caisson and the ground, thereby discharging the soil from the work room. In addition, the material shaft will be added upward as the caisson sinks. Here, when the material lock is provided at the upper end of the material shaft, after removing the material lock, the material shaft is added upward, and the material lock is again installed at the upper end of the material shaft. On the other hand, when the material lock is provided at the lower portion of the material shaft, the material shaft is added upward without requiring the material lock to be attached or detached (see, for example, Patent Document 1).

JP 2012-77566 A

  In the construction of a pneumatic caisson, when using a Telha crane as a crane, it is necessary to arrange the tip side of the horizontal jib directly above the material shaft. On the other hand, when adding a material shaft, it is necessary to suspend the material shaft or material lock directly above the material shaft by another crane. Therefore, conventionally, when adding a material shaft, it is necessary to retreat the tip of the horizontal jib from directly above the material shaft by turning or bending the horizontal jib of the Telha crane. Was complicated.

  The present invention has been made in view of the above circumstances, and without carrying out a complicated mechanism in the Telha crane, to carry out the lifting work by another crane under the tip side of the horizontal jib of the Telha crane. It is what makes it possible.

  In order to solve the above-described problem, a Telha crane according to the present invention includes a mast, a horizontal jib that is horizontally supported by the mast, in which two rows of beams formed with rails are coupled in parallel to each other, and A first trolley supported horizontally by the two rows of rails of the horizontal jib, and supported by the two rows of rails of the horizontal jib so as to be horizontally movable at the front end side of the horizontal jib from the first trolley. A second winch supported by the mast, a first sheave on the first trolley, a second sheave on the second trolley, and the hoist A hoisting mechanism provided with a hoisting rope that is attached to a lifting object by being wound in order of the second hoisting sheave coming out of the winch and the first hoisting sheave, and a transverse winch supported by the horizontal jib And each A pair of first traversing sheaves provided at the tip of each of the first and second pair of second traversing sheaves provided on the second trolley, one side of the first trolley exiting from the traversing winch in two or one row The other side of the horizontal winch exits in two or one row, and at the tip of the horizontal jib, a pair of the first horizontal sheave and a pair of the second horizontal sheave are wound in this order. A traversing line attached to the tip of the beam in the row, a traverse tension sheave provided on the second trolley, one side attached to the proximal end of the horizontal jib and the other side wrapped around the traverse tension sheave A traversing mechanism including a traversing tension cord attached to the first trolley, and a predetermined range from the distal end to the proximal end side of the horizontal jib is vertically Both sides and the water Wherein the distal end is open to the side space of the jib is formed.

  In the Telha crane, one side of the traversing cable exits from the traversing winch in a row and is attached to the first trolley, and the other side of the traversing cable exits from the traversing winch in a row and ends of the horizontal jib. Then, a pair of the first traversing sheave and a pair of the second traversing sheave may be wound in order in two rows and attached to the distal ends of the two rows of beams.

  Further, the Telha crane includes a connecting member that connects a portion of the traversing line and a portion of the two rows, and the one row portion and the two rows of the traversing line are the two row portions. It may be attached to the connecting member so that the tensions of the two are equal to each other.

  Further, the pneumatic caisson construction method according to the present invention includes the Telha crane installed so that the material shaft and the material lock are positioned under the predetermined range, and the earth and sand bucket attached to the hoisting rope is the material. A pneumatic caisson construction method for moving up and down through a shaft and the material lock and using another crane to add the material shaft, and when performing the addition of the material shaft, The material shaft or the material lock is carried in and out of the predetermined range by the other crane so that the hoisting rope enters and exits the space in the predetermined range.

  According to the present invention, it is possible to carry out a lifting work by another crane under the front end side of the horizontal jib of the Telha crane without providing a complicated mechanism in the Telha crane.

It is an elevation view which shows the Telha crane which concerns on one Embodiment. It is an elevation view which expands and shows a 1st trolley and a 2nd trolley. FIG. 3 is an enlarged plan view of a first trolley and a second trolley. It is an elevation view which shows a horizontal jib and a drive mechanism. It is a top view which shows a horizontal jib and a drive mechanism. It is a roping figure (plan view) of a hoisting line, a traversing line, and a traversing line. (A)-(C) are the roping figure (elevation figure) of a hoisting rope, a transverse line, and a transverse tension line. It is a figure which shows the state of the drive mechanism at the time of the rising of a sediment bucket. It is a figure which shows the state of the traversing mechanism at the time of the horizontal movement of the earth and sand bucket. It is a figure which shows the state of the traversing mechanism at the time of the horizontal movement of the earth and sand bucket. It is a top view which expands and shows the front-end | tip part of a horizontal jib. It is an elevation view which shows the state which lifts material lock with another crane, and is carrying in / out to the installation position. It is a roping figure (plan view) of a traversing line of a traversing mechanism of a Telha crane according to another embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevation view showing a Telha crane 10 according to an embodiment. As shown in this figure, a Telha crane 10 is a horizontal jib crane used in the construction of a pneumatic caisson 1, and a soil bucket 2 is passed through a material shaft 3 and a material lock 4 to a work room 5 at the bottom of the caisson and the ground. Raise and lower between.

  In the construction of the pneumatic caisson 1 according to the present embodiment, the material lock 4 is installed at the upper end of the material shaft 3. Then, the material shaft 3 is added in accordance with the increase in the sinking amount of the pneumatic caisson 1. At that time, after removing the material lock 4, the material shaft 3 is added upward, and the material lock 4 is installed on the upper end of the material shaft 3 again.

  The Telha crane 10 includes a mast 12 installed in the vicinity of the construction area of the pneumatic caisson 1, an earth and sand hopper 14 installed in the lower part of the mast 12, and the material shaft 3 and the material lock 4 directly above the mast 12. A horizontal jib 20 extending horizontally so as to pass through and a drive mechanism 30 installed on the horizontal jib 20 and the mast 12 for moving the earth and sand bucket 2 up and down and moving in the horizontal direction are provided. The mast 12 is a square columnar steel tower, and supports the horizontal jib 20 above the material lock 4.

  The horizontal jib 20 has a configuration in which a pair of I beams 21 parallel to each other are coupled by a plurality of steel members 23 (see FIG. 3 and the like) disposed therebetween, and the lower flanges of the pair of I beams 21 are rails 22. It has become. The rail 22 extends so as to pass right above the earth and sand hopper 14 and right above the material lock 4. Here, the horizontal jib 20 is fixed to the mast 12 and is immovable with respect to the mast 12. That is, the Telha crane 10 is not provided with a mechanism for turning the horizontal jib 20 and a mechanism for folding the horizontal jib 20.

  The drive mechanism 30 includes a first trolley 32 and a second trolley 34 supported by the horizontal jib 20 so as to be horizontally movable along the rail 22, a hoisting mechanism 40 for raising and lowering the earth and sand bucket 2, and the earth and sand bucket 2. And a traversing mechanism 50 for horizontal movement. The first trolley 32 and the second trolley 34 are arranged side by side in the longitudinal direction of the horizontal jib 20, and the second trolley 34 is arranged closer to the front end side of the horizontal jib 20 than the first trolley 32.

  FIG. 2 is an enlarged elevation view showing the first trolley 32 and the second trolley 34, and FIG. 3 is an enlarged plan view showing the first trolley 32 and the second trolley 34. As shown in these drawings, two sets of guide rollers 32 </ b> A are provided on the upper portion of the first trolley 32, two sets for each rail 22. The two guide rollers 32 </ b> A of each set are arranged coaxially with the web of the I beam 21 interposed therebetween, and the two sets of guide rollers 32 </ b> A are arranged apart from each other in the longitudinal direction of the horizontal jib 20. The four guide rollers 32A are arranged so as to be able to roll on the rails 22, and the first trolley 32 is supported by the rails 22 on both sides so as to be horizontally movable via a total of eight guide rollers 32A. ing.

  Further, two guide rollers 34 </ b> A for each rail 22 are arranged on the upper portion of the second trolley 34 so as to be separated from each other in the longitudinal direction of the horizontal jib 20. The two guide rollers 34A are arranged on the rail 22 so as to be able to roll, and the second trolley 34 is supported by the rails 22 on both sides so as to be horizontally movable via a total of four guide rollers 34A. Yes.

  FIG. 4 is an elevational view showing the horizontal jib 20 and the drive mechanism 30, and FIG. 5 is a plan view showing the horizontal jib 20 and the drive mechanism 30. As shown in these drawings, a scaffold 24 and a fence 26 are provided around the horizontal jib 20. In addition, it demonstrates below by making the mast 12 side into the base end side and the material shaft 3 side as the front end side at the one end side of the horizontal jib 20 in the longitudinal direction. Further, in FIG. 5, illustration of a hoisting rope 47, a traversing rope 58, and a traversing tension cord 59, which will be described later, is omitted.

  The hoisting mechanism 40 includes a hoisting winch 42 disposed at the upper end of the mast 12, a hoisting sheave 43 disposed at the center in the longitudinal direction of the horizontal jib 20, and upper and lower members disposed at the base end of the horizontal jib 20. A pair of winding sheaves 44, a winding sheave 45 disposed on the second trolley 34, a winding sheave 46 disposed on the first trolley 32, and a winding winch 42 wound around the winding sheaves 43 to 46. And a hoisting rope 47 wound around. The tip of the hoisting rope 47 is attached to the earth and sand bucket 2. The hoisting sheaves 43 to 46 are arranged in the center portion in the width direction in the plan view of the horizontal jib 20, and the hoisting rope 47 passes above and below the center portion in the width direction in the plan view of the horizontal jib 20. It is wound around the winding sheaves 43 to 46 (see FIG. 5).

  Further, the traversing mechanism 50 includes a traversing winch 52 disposed between the hoisting winch 42 and the hoisting sheave 43 on the horizontal jib 20 and a pair of upper and lower pairs disposed at the base end portion of the horizontal jib 20. Two sets of traversing sheaves 53, a pair of traversing sheaves 54 disposed at the tip of the horizontal jib 20, a pair of traversing sheaves 55 disposed on the second trolley 34 and one traversing tension sheave 51, and a horizontal jib 20, a pair of traverse sheaves 56 (see FIG. 4) disposed between the traverse sheave 54 and the traverse winch 52, an overload prevention limit switch 57 disposed at the tip of the horizontal jib 20, and a traverse sheave 53. -55, a pair of traversing cords 58 wound around the traversing winch 52, and a traversing tension cord 59 wound around the traversing tension sheave 51. One end of the traverse 58 is fixed to the first trolley 32 and the other end is fixed to an overload prevention limit switch 57. Further, one end of the traversing tension line 59 is fixed to the lower end of the base end of the horizontal jib 20 and the other end is fixed to the first trolley 32.

  The transverse winch 52 is a capstan winch having a pair of warving drums arranged coaxially, and a transverse rope 58 is wound around each warping drum. Further, as shown in FIG. 5, the transverse sheaves 53 to 56 are arranged in two columns, and the transverse sheaves 53 to 56 in one column are arranged along one rail 22, and The transverse sheaves 53 to 56 are arranged along the other rail 22. One traversing cord 58 is wound around the traversing sheaves 53 to 56 of one column, and the other traversing cord 58 is wrapped around the traversing sheaves 53 to 56 of the other column.

  FIG. 6 is a roping diagram (plan view) of the hoisting rope 47, the traversing cable 58, and the traversing tensioning cable 59, and FIGS. 7A to 7C show the hoisting cable 47, the traversing cable 58, and the traversing line. It is a roping figure (elevation figure) of the tension cord 59. As shown in FIGS. 6 and 7A, the hoisting winch 42, the hoisting sheave 43, and the upper hoisting sheave 44 are arranged on the upper side of the horizontal jib 20, and the pair of upper and lower hoisting sheaves 44 are The winding sheaves 45 and 46 are disposed on the lower side of the horizontal jib 20. The hoisting rope 47 extends from the hoisting winch 42 to the distal end side of the horizontal jib 20 on the upper side of the horizontal jib 20, and the direction is changed to the base end side of the horizontal jib 20 by the hoisting sheave 43. At 44, the direction is changed to the lower side of the horizontal jib 20. Then, the hoisting rope 47 is changed in direction toward the distal end side of the horizontal jib 20 by the lower hoisting sheave 44, and is changed in direction toward the proximal end side of the horizontal jib 20 by the hoisting sheave 45 of the second trolley 34. The direction is changed downward by the winding sheave 46 of the first trolley 32.

  Here, in order to raise the earth and sand bucket 2, it is necessary to wind up the hoisting rope 47 by the hoisting winch 42 in a state where the first trolley 32 is stopped. In order to move the earth and sand bucket 2 horizontally, the first trolley 32 needs to be traversed. In order to enable these operations, the second trolley 34 is provided, and the transverse rope 58 and the transverse tension cord 59 are roped as described below.

  As shown in FIGS. 6 and 7B, the traversing winch 52 and the traversing sheave 56 are arranged on the upper side of the horizontal jib 20, and the two sets of traversing sheaves 53 are arranged on the side surface of the base end portion of the horizontal jib 20. The traversing sheave 55 of the second trolley 34 is disposed below the horizontal jib 20, and the traversing sheave 54 is disposed on the inner wall surface at the tip of the horizontal jib 20. The traverse 58 extends from the traverse winch 52 to the front end side and the base end side of the horizontal jib 20 on the upper side of the horizontal jib 20, and the direction is changed to the lower side of the horizontal jib 20 by the upper traverse sheave 53 on the base end side. On the front end side, the traverse sheave 56 is guided to the traverse sheave 54. The traversing line 58 is changed in direction toward the distal end side of the horizontal jib 20 by the lower traverse sheave 53 on the base end side of the horizontal jib 20, and the horizontal jib 20 is traversed by the traverse sheave 54 on the distal end side of the horizontal jib 20. The direction is changed to the base end side. Then, on the lower side of the horizontal jib 20, one end side of the traversing rope 58 extends from the lower traversing sheave 53 to the first trolley 32 and is fixed to the first trolley 32, and the other end side of the traversing rope 58 is The direction is changed to the front end side of the horizontal jib 20 by the transverse sheave 55 of the two trolleys 34 and fixed to the overload prevention limit switch 57.

  Here, if both ends of the traversing cable 58 are fixed to the first trolley 32, the earth and sand bucket 2 is raised with the first trolley 32 stopped even if the first trolley 32 can be traversed. I can't. Therefore, one end of the traversing cable 58 is fixed to the first trolley 32, and the other end is hooked on the traversing sheave 55 of the second trolley 34 and fixed to the overload prevention limit switch 57 at the tip of the horizontal jib 20. Further, as will be described below, roping of the traversing tension cord 59 is performed.

  As shown in FIGS. 6 and 7C, the transverse tension line 59 extends from the base end of the horizontal jib 20 to the transverse tension sheave 51 of the second trolley 34 on the lower side of the horizontal jib 20. The direction is changed to the base end side of the horizontal jib 20 by the sheave 51 and fixed to the first trolley 32.

  Here, when the traversing tension line 59 is tensioned, a force is exerted on the first trolley 32 and the second trolley 34 in a direction in which they approach each other. It is in the state that was done. In addition, when the tension | tensile_strength of the transverse line 58 and the transverse line 59 becomes excessive, the overload prevention limit switch 57 will act | operate.

  FIG. 8 is a diagram illustrating a state of the drive mechanism 30 when the earth and sand bucket 2 is lifted. As shown in this figure, a force toward the proximal end of the horizontal jib 20 acts on the second trolley 34 from the hoisting rope 47, and this force is horizontal with respect to the first trolley 32 via the transverse rope 58. It acts as a pulling force on the base end side of the jib 20. That is, when the hoisting rope 47 is wound up by the hoisting winch 42, the force P toward the proximal end of the horizontal jib 20 acts on the first trolley 32.

  Here, a force Q toward the distal end side of the horizontal jib 20 is applied to the first trolley 32 by the transverse tension cord 59, and this force Q and the force P are balanced. Thereby, in the state which stopped the 1st trolley 32, the hoisting rope 47 can be wound up by the hoisting winch 42, and the earth and sand bucket 2 can be raised.

  9 and 10 are views showing the state of the traversing mechanism 50 when the earth and sand bucket 2 moves horizontally. As shown in FIG. 9, when the traverse winch 52 rotates in the clockwise direction in the figure (the direction of arrow A in the figure), the force R from the traverse 58 to the proximal end of the horizontal jib 20 with respect to the first trolley 32 is generated. This force acts as a force S that pulls the second trolley 34 to the proximal end side of the horizontal jib 20 via the transverse tension line 59. At this time, since no force resisting the forces R and S is generated, the first trolley 32 and the second trolley 34 move to the proximal end side of the horizontal jib 20.

  Further, as shown in FIG. 10, when the traversing winch 52 rotates counterclockwise in the figure (the direction of arrow B in the figure), the force from the traversing cable 58 to the second trolley 34 toward the tip side of the horizontal jib 20 T acts, and this force acts as a force U that pulls the first trolley 32 toward the distal end side of the horizontal jib 20 via the transverse tension line 59. At this time, since no force resisting the forces T and U is generated, the first trolley 32 and the second trolley 34 move to the front end side of the horizontal jib 20. Further, since both the first trolley 32 and the second trolley 34 move to the proximal end side of the horizontal jib 20, between the traversing winch 52 and the traversing sheave 56, between the traversing sheave 56 and the traversing sheave 54, and traversing Between the sheave 54 and the traversing sheave 55, the traversing cord 58 is not loosened.

  Here, as shown in FIGS. 9 and 10, the moving sheave 55 of the second trolley 34 around which the traversing cable 58 is wound is a moving pulley, so that the amount of movement of the second trolley 34 is the first trolley. It becomes 1/2 of the movement amount of 32. That is, the first trolley 32 moves to a position immediately above the material lock 4 and directly above the earth and sand hopper 14, whereas the second trolley 34 has the vicinity of the front end of the horizontal jib 20 and the longitudinal center of the horizontal jib 20. Move between departments. Further, since both the first trolley 32 and the second trolley 34 move to the tip side of the horizontal jib 20, the traversing rope 58 does not loosen between the traversing winch 52 and the traversing sheave 53.

  FIG. 11 is an enlarged plan view showing the tip of the horizontal jib 20. As shown in this figure, at the front end portion of the horizontal jib 20, a pair of transverse sheaves 54 are arranged between the pair of I beams 21 so as to be separated in the width direction in a plan view of the horizontal jib 20. Here, in the range of the base end side of the horizontal jib 20 from directly above the material lock 4, the steel material 23 that couples them is arranged between the pair of I beams 21, whereas the material lock 4 In the range from directly above to the tip of the horizontal jib 20, only a pair of traversing sheaves 54 and a pair of traversing ropes 58 are disposed between the pair of I beams 21, and the steel material 23 is not disposed. In other words, in a predetermined range from the distal end of the horizontal jib 20 to the proximal end side, a space 28 is formed between the pair of I beams 21 and is open to both the upper and lower sides and the distal end side of the horizontal jib 20.

  Here, the shaft centers of the material shaft 3 and the material lock 4 are located under the space 28. For this reason, in the state where the first trolley 32 and the second trolley 34 are retracted from the bottom of the space 28 of the horizontal jib 20 to the base end side, the horizontal jib 20 is moved from directly above the axis of the material shaft 3 and the material lock 4. Open spaces are created on both the upper and lower sides and the front end side of the horizontal jib 20 up to the front end of the horizontal jib 20.

  FIG. 12 is an elevational view showing a state in which the material lock 4 is lifted by another crane and carried into and out of the installation position. As shown in this figure, when the material shaft 3 is added, the material lock 4 is lifted by another crane and carried into and out of the installation position. Although not shown in the figure, the material shaft 3 to be added is lifted by the other crane and carried to the addition position. Here, the hoisting rope 6 of the crane that lifts the material lock 4 and the material shaft 3 is moved in and out of the space 28 of the horizontal jib 20, the material lock 4 is carried in and out of the installation position, and the material shaft 3 is moved. Carry to the extension position.

  As described above, in the Telha crane 10 according to the present embodiment, the first trolley 32 moves between the material lock 4 and the base end side of the horizontal jib 20, and the second trolley 34 is the material lock 4. It is the structure which moves between the front-end | tip of a horizontal jib 20 and a longitudinal direction intermediate part across right above. For this reason, the horizontal jib 20 extends horizontally directly above the material lock 4.

  Here, in a predetermined range from the distal end of the horizontal jib 20 to the proximal end side, a space 28 is formed between the pair of I beams 21 and is open to both the upper and lower sides and the distal end side of the horizontal jib 20. The axis of the material shaft 3 is located under the space 28 (see FIG. 11). As a result, a space for moving the hoisting rope 6 of the crane that lifts the material lock 4 or the material shaft 3 to just above the material lock 4 or the material shaft 3 is secured above the material lock 4 or the material shaft 3. can do. Therefore, the material lock 4 can be carried in and out of the installation position and the material shaft 3 can be added and carried into the addition position without turning or bending the horizontal jib 20 (see FIG. 12). Therefore, since it becomes possible to add the material shaft 3 under the front end side of the horizontal jib 20 without providing a complicated mechanism in the Telha crane 10, the manufacturing cost of the Telha crane 10 can be reduced.

  FIG. 13 is a roping diagram (plan view) of the traversing line 158 of the traversing mechanism 150 of the Telha crane according to another embodiment. As shown in this figure, the traversing mechanism 150 according to the present embodiment includes a traversing winch 152 and a traversing rope 158 instead of the traversing winch 52 and the traversing rope 58 of the traversing mechanism 50 according to the above-described embodiment. The transverse winch 52 is a capstan winch having one warping drum, and this warping drum is arranged at the center in the width direction of the horizontal jib 20 in plan view. The traversing rope 158 includes a row 158A wound around the warping drum of the traversing winch 52 and two rows 158B on the front end side of the horizontal jib 20, which are fixed to the connecting plate 159. It is connected. Further, at the base end of the horizontal jib 20, a pair of upper and lower traverse sheaves 53 are arranged at the center in the width direction in plan view.

  The connecting plate 159 is an isosceles triangular plate, one end of the row 158A is fixed to the apex angle of the connecting plate 159, and one end of each of the two rows 158B is fixed to the bottom angle of the connecting plate 159. ing. A row of portions 158A exits from the apex angle of the connecting plate 159 and is wound around the warping drum of the traverse winch 152, and exits from the warping drum to the tip of the horizontal jib 20 by a pair of upper and lower traverse sheaves 53 at the base end of the horizontal jib 20. The direction is changed to the side and fixed to the first trolley 32. Each of the two rows 158B is changed in direction toward the base end side of the horizontal jib 20 by the horizontal sheave 54 at the front end of the horizontal jib 20 from the bottom angle of the connecting plate 159, and the horizontal sheave of the second trolley 34 is changed. The direction is changed to the front end side of the horizontal jib 20 at 55 and fixed to the overload prevention limit switch 57.

  Here, the center of gravity of the connecting plate 159 is located on the extended line of the row 158A in the row of transverse lines 158, and the two rows 158B of the transverse line 158 are attached at positions equidistant from the extended line. As a result, the tension in the two rows 158B of the traversing cord 158 becomes equal, so that both the two rows 158B of the traversing cord 158 can be tensioned without loosening, and the first trolley 32 and the second trolley 34 Can be ramped well.

  Further, in the traversing mechanism 150 according to the present embodiment, the traversing line 158 is configured to be in one line on the proximal side of the space 28 of the horizontal jib 20, so that the traversing line as a whole has two lines. As a result, the number of warping drums and the transverse sheaves 53 of the transverse winch 152 can be halved, and the manufacturing cost can be reduced.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the present invention has been described by taking the Teruha crane 10 used in the construction of the pneumatic caisson 1 as an example. However, if the construction involves a crane work on the front end side of the horizontal jib 20, The same effect can be obtained by using the Telha crane according to the present invention. Further, instead of the connecting plate 159, a rod-like connecting member may be provided, or the number and arrangement of sheaves may be changed.

1 pneumatic caisson, 2 earth and sand bucket, 3 material shaft, 4 material lock, 5 work room, 6 hoisting rope, 10 terha crane, 12 mast, 14 earth and sand hopper, 20 horizontal jib, 21 I beam, 22 rail, 23 steel , 24 scaffold, 26 fence, 28 space, 30 drive mechanism, 32 first trolley, 32A guide roller, 34 second trolley, 34A guide roller, 40 hoist mechanism, 42 hoist winch, 43, 44, 45, 46 rolls Upper sheave, 47 winding rope, 50 transverse mechanism, 51 transverse tension sheave, 52 transverse winch, 53, 54, 55, 56 transverse sheave, 57 overload prevention limit switch, 58 transverse rope, 59 transverse tension rope, 150 transverse mechanism , 152 transverse winch, 158 transverse rope, 158A part of one row 158B two rows portion, 159 connection plate

Claims (4)

With the mast,
A horizontal jib in which two rows of beams on which rails are formed are coupled in parallel to each other and supported horizontally on the mast;
A first trolley supported horizontally by the two rows of the rails of the horizontal jib;
A second trolley supported by the two rows of rails of the horizontal jib so as to be horizontally movable on the tip side of the horizontal jib from the first trolley;
A hoisting winch supported by the mast, a first hoisting sheave provided on the first trolley, a second hoisting sheave provided on the second trolley, and the second winch sheave coming out of the hoisting winch. A winding mechanism comprising a two-roll sheave, and a hoisting rope that is wound in the order of the first-roll sheave and attached to the lifting object;
A traverse winch supported by the horizontal jib, a pair of first traverse sheaves provided at the tip of each beam, a pair of second traverse sheaves provided on the second trolley, and one side of the traverse winch Are attached to the first trolley in two rows or one row from the other, the other side comes out in two rows or one row from the transverse winch, and at the tip of the horizontal jib, a pair of the first transverse sheaves, a pair of the above-mentioned A traversing rope wound around the second traversing sheave in this order and attached to the tip of the two rows of beams, a traversing tension sheave provided on the second trolley, one side attached to the proximal end of the horizontal jib A traverse mechanism including a traverse tension cord wound on the traverse tension sheave and attached to the first trolley,
In a predetermined range from the distal end of the horizontal jib to the proximal end side, open spaces are formed between the upper and lower sides and the distal end side of the horizontal jib between the two rows of the beams. crane.   One side of the traversing line comes out of the traversing winch in a row and is attached to the first trolley, and the other side of the traversing rope comes out of the traversing winch in a row and comes in two rows at the end of the horizontal jib. The Teruha crane according to claim 1, wherein the first traversing sheave and the pair of second traversing sheaves are wound in this order and attached to the ends of the two rows of beams. A connecting member for connecting the row portion and the row portion of the traversing line;
The portion of the one row and the portion of the two rows of the traversing rope are attached to the connecting member so that the tension of the portions of the two rows is equal to each other. Telha crane. The Telha crane according to any one of claims 1 to 3 is installed such that a material shaft and a material lock are located under the predetermined range, and the earth and sand bucket attached to the hoisting rope is It is a construction method of a pneumatic caisson that moves up and down through a material shaft and the material lock, and performs extension of the material shaft using another crane,
When the material shaft is extended, the material shaft or the material lock is moved below the predetermined range by the other crane so that the hoisting rope of the other crane enters and exits the space of the predetermined range. Pneumatic caisson construction method characterized by carrying in and out.

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