JP4459758B2 - Segment hanging jig - Google Patents

Description

  The present invention relates to a segment construction technique for constructing a segment on an inner wall surface of an excavation hole excavated by a shield excavator.

  The shield construction method is a construction method that has become the mainstream in recent years as a method for constructing a tunnel in a congested urban area. After excavating a natural ground with a shield excavator, a segment made of RC: Reinforced Concrete Construction (reinforced concrete) This is a method of forming a tunnel by assembling a large number of (the block bodies constituting the inner wall surface of the tunnel). A tunnel constructed by the shield method is called a shield tunnel.

FIG. 7 is a conceptual diagram of the shield tunnel 220.
As can be seen from the figure, a large number of segments 301 are connected in the circumferential direction and the axial direction of the excavation hole 300 excavated by the shield excavator to form an inner wall surface of the cylindrical shield tunnel 220 (in the drawing, one cylindrical shape is used). Only the part is shown.)

  The segment 301 is a curved body in which the cross-sectional shape with respect to the axial direction of the shield tunnel 220 is an arc shape, and the vertical cross-section is also a rectangular shape. The cross section of the segment 301 is provided with a plurality of pairs of connecting rods for connecting the segments 301 and fitting holes for fitting the connecting rods (the connecting rod and the fitting holes are not shown). In addition, what is shown with the code | symbol 229 in FIG. 7 is a part of natural ground.

  The supply of the segment into the tunnel is performed via the shaft, and at that time the segment is suspended by a hoist using a wire and lowered into the tunnel. FIG. 8 is a perspective view showing a state in which the segment 301 is suspended.

A joint pin 331 for suspending the segment 301 is attached to a hook of a hoist (not shown).
The segment 301 is formed with a segment holding hole 301 a that fits with the joint pin 331 and holds the segment 301.

  By operating the lever 331a of the joint pin 331, a ball (not shown) appears and disappears from the outer peripheral surface of the pin, and when the ball comes out, the ball is recessed in the segment holding hole 301a (see FIG. (Not shown), the joint pin 331 is prevented from coming off from the segment holding hole 301a. As a result, the segment 301 can be lifted by a hoist.

  By the way, as apparent from FIG. 8, the segment 301 has only one segment holding hole which is a part for suspending the segment 301. Therefore, when the segment is lifted, the segment 301 is horizontal or slightly inclined as shown in FIG. It becomes the side hanging state.

  However, if the passage is narrow after the segment has been lifted up to the tunnel, such as when the vertical length is narrow, it may not be transported unless the segment is in a vertically suspended state.

However, if the segment has only one segment holding hole for hanging the segment, the segment cannot be easily suspended vertically. In addition, it is impossible to change from a vertically suspended state to a horizontally suspended state in the state of being lifted even in the case of a vertical suspension, or from a horizontally suspended state to a vertically suspended state.

The present invention has been made in view of such circumstances, and the problem to be solved is as follows.
It is an object of the present invention to provide a technique capable of easily suspending a segment vertically even if the segment is suspended only by one segment holding hole.

Therefore, the present invention employs the following means.
That is, the segment suspension jig of the present invention is a joint that fits into the holding hole formed in the segment for transporting the segment that is a block body for forming the tunnel wall surface in the excavation hole excavated by the shield excavator. It has a pin, a fulcrum part, a force point part, and an action point part. The joint pin is rotatably supported by the fulcrum part, and a steel cable is attached to the force point part, and a segment is pressed to the action point part. And a pair of arms to which a pressing unit is attached.

  In the segment suspension jig according to the present invention, the arm is supported at the fulcrum portion of the arm by the joint pin fitted in the holding hole of the segment and is pivotally supported, and the steel cord is attached at the force point portion. When the steel cable is pulled up, the force point rises with respect to the fulcrum portion of the arm, and the push-down portion provided at the action point portion descends with respect to the fulcrum portion, and the segment is pushed down. To come. Since there are a pair of such arms, the segment is pushed down at a plurality of locations by the push-down portion of each arm.

  Further, if the pair of arms are attached to the joint pin so as to be rotatable and crossed when viewed from the side, the pressing portions provided at the action point portions of the pair of arms are The segment is pushed on both sides of the joint pin fitted in the holding hole. It is preferable that the pair of arms have the same shape and are axisymmetrically combined when viewed from the side so that pressing by the pair of arms is equal.

  Therefore, when the joint pin is fitted into the holding hole of the segment and the segment is transported, if the force pressing the segment by the pressing portion of the arm on the side inclined (displaced) in the segment increases, Since the upward tilting side is restrained from moving upward, the posture of the segment is controlled and it becomes difficult to be unbalanced.

  In addition, by appropriately adjusting the position where the segment is pressed by the pressing unit, the segment can be lifted in a more horizontal state. If the segment is horizontal, concentrated stress is less likely to occur on the surface of the joint pin or segment where the segment holding hole is formed (segment holding hole forming surface). As a result, the joint pin and the segment are not damaged or deformed.

  In the horizontal state, the segment is difficult to tilt during transportation, so that it is not necessary for the operator to be extremely careful about whether the segment collides with surrounding objects, and the burden on the operator is reduced. Therefore, an increase in work efficiency can be expected.

Among the steel cables attached to the power point, the steel cable related to one arm is locked to the hoisting tool of the hoist, and the steel cable related to the other arm is provided with a length adjusting tool for adjusting the length of the steel cable. In this state, it is locked to the hanging tool. Examples of the length adjuster include a chain block that raises and lowers heavy objects.

  The chain block is a chain block body having an upper hook, a pulley provided in the body, and a chain wound around the pulley is unwound or wound up by the pulley to raise and lower the lower hook of the chain end. A heavy object is lifted and lowered by attaching a heavy object to the lower hook. And the upper hook of such a chain block is attached to the hook of the hoist through a steel cable, and the steel cable connected to the power point part of one arm of the pair of arms is also attached to the hook of the hoist, and the lower hook of the chain block The steel cord connected to the power point portion of the other arm is engaged with.

  In this state, when the segment is suspended vertically from the horizontal, the chain block chain length changes by rotating the chain block pulley clockwise or counterclockwise. The distance between the power point and the hoist hook changes, the segment changes from a horizontal state to an inclined state, and eventually becomes a vertically suspended state. In order to level the segment, the pulley of the chain block is rotated counterclockwise or clockwise so that the distance between the force point of one arm and the hook of the hoist and the force point of the other arm Make the distance between the hoist hooks uniform.

    In either case, a pair of arms with the same shape and line symmetry will press the multiple portions of the segment evenly at the pressing part, so that concentrated stress will not be generated on the formation surface of the segment holding hole and the joint pin it can. A wireless chain block that can remotely control the chain unwinding or winding operation is desirable.

  According to the present invention, even if the segment has only one segment holding hole, the segment can be suspended vertically.

Hereinafter, embodiments of the present invention (hereinafter, embodiments) will be described with reference to the accompanying drawings.
1 to 6 show an embodiment of the present invention.
FIG. 1 is an overall perspective view of a segment suspending jig according to the present invention when the segment is in a horizontal state. 2 is a front view of the segment hanging jig according to the present invention, FIG. 3 is a plan view thereof, FIG. 4 is a view seen from the direction of arrow A in FIG. 2, and FIG. FIG. 6 is a front view showing a state in which a segment is vertically suspended using the segment hanging jig, and FIG. 6 is a diagram showing a state before the segment is lifted by the segment hanging jig. In addition, the same code | symbol is attached | subjected to the same part as having demonstrated by description of a prior art, and description is abbreviate | omitted.

  The segment suspension jig 30 holds the suspended state of the segment when the segment 301 is transported into the tunnel through the vertical shaft. In realizing the holding, the segment suspension jig 30 includes a joint pin 31 that fits into the segment holding hole 301a formed in the inner surface 301b of the segment 301, and an arm portion 33 that is combined with the joint pin 31. Yes.

  The joint pin 31 has the same basic structure as the joint pin 331, and can be coupled to the segment 301 by operating the lever 31a (see FIG. 2).

The arm portion 33 includes a pair of arms 35A and 35B formed by combining square pipes. When the arms 35A and 35B are functionally described, each arm has a fulcrum portion 37, a force point portion 39, and an action point portion 41. The fulcrum portion 37 supports the joint pin 31, and the force point portion 39 is a steel cable. Are connected to a hoisting hook 330 (not shown) via a wire 54L / 54S, and the action point portion 41 has a pressing portion 36 for directly pressing the segment 301. The wires 54L and 54S are collectively indicated by reference numeral 54. Note that the fulcrum part 37, the force point part 39, and the action point part 41 each include the word “point” in their names, but are not mathematical points but specific areas of the arms 35A and 35B.

  Further, when viewed in a plan view (FIG. 3), the force point portion 39 and the action point portion 41 have a rectangular shape that opens in opposite directions in a back-to-back state in the longitudinal direction of the arm portion 33 (hereinafter referred to as the axial direction). Has been. Further, a reinforcing square pipe 43 is provided on the inner side of the opening of the force application point 39, and a segment holding pipe structure 45 that holds the segment 301 so as to hold the segment 301 at the opening end of the application point 41. It protrudes to the side of 41 and is in a state of almost the same dimension as the width dimension of the force application point 39. The pipe structure 45 is open in one direction (downward) and has a flat U-shape as shown in FIG. 4 in order to hold the segment 301 on its upper surface and side surfaces.

  In the pipe structure 45, four pressing portions 36 are provided at locations corresponding to the inner surface 301b and the side surface 301c of the segment 301. The pressing portion 36 is formed of a friction material such as a rubber plate for increasing the frictional resistance generated between the pressing portion 36 and the segment 301 when the segment 301 is pressed. The pressing portion 36 is in close contact with the inner surface 301b and the side surface 301c of the segment 301.

The force point portion 39 and the action point portion 41 are connected via a fulcrum portion 37, and form a step when the segment suspension jig 30 is viewed from the front as shown in FIG.
The fulcrum portion 37 is formed by arranging a pair of square pipes parallel to the axial direction when viewed in plan (FIG. 3) and obliquely when viewed from the front (FIG. 2). 31 is attached in a suspended state. In addition, the fulcrum part of the arm 35A and the fulcrum part of the arm 35B are indicated by reference numerals 37A and 37B, respectively (a general term for these is indicated by reference numeral 37). In the fulcrum part 37A and the fulcrum part 37B, the distance between the square pipes constituting each fulcrum part is different, the fulcrum part 37A has no distance between the square pipes, and the fulcrum part is between the fulcrum parts 37B. 37A is sandwiched, and both arms are combined so as to intersect when viewed from the front (side). This is because the structure for supporting the joint pin 31 is adopted in a state where both the fulcrum part 37A and the fulcrum part 37B are coaxial, and when the two arms are combined with each other, This is so as not to get in the way.

  The joint pin 31 is attached to the fulcrum part 37A and the fulcrum part 37B at its upper end so as to be rotatable. That is, on the upper part of the joint pin 31, a rotating shaft 49 and four arm support bases 51 fixed to the rotating shaft 49 are provided (see FIGS. 1 and 2). The four arm support bases 51 are fixed to the lower surfaces of the square pipes constituting the fulcrum portions 37A and 37B, respectively. In this way, by fixing the fulcrum portions 37A and 37B to the joint pin 31 via the arm support base 51, the arms 35A and 35B can move up and down like a seesaw with respect to the joint pin 31.

  In addition, a pair of plate-like suspension hooks 53 and 53 are rotatably attached to the opening-side tips of the force application points 39 of both arms 35A and 35B, respectively. The plate-like suspension hook 53 is formed with a wire through hole for binding the wire 54 to the tip portion.

Such arms 35 </ b> A and 35 </ b> B are integrated by an assembly tool such as a bolt to constitute the arm portion 33. One end of the long wires 54L and 54L is attached to the plate-like suspension hooks 53 and 53 of one arm 35A, and the other ends of the wires 54L and 54L are locked to the hook 330 of the hoist. One end of short wires 54S and 54S is attached to the plate-like suspension hooks 53 and 53 of the other arm 35B, and the other end of the wires 54S and 54S is an electric chain block 60 for raising and lowering heavy objects. It is hooked on the lower hook 60d. Further, another wire 54S is locked between the upper hook 60u of the electric chain block 60 and the hook 330 of the hoist and further.

  The electric chain block 60 includes a chain block main body 62 having an upper hook 60u, a pulley (not shown) provided in the main body, and a chain 66 wound around the pulley and having a lower hook 60d. The lower hook 60d attached to the end of the chain is moved up and down by unwinding or winding up, and a heavy object is moved up and down by attaching a segment or other heavy object to the lower hook 60d. A wireless chain block that can remotely control the chain unwinding or winding operation is desirable.

  For convenience of explanation, the linear distance between the plate-like suspension hook 53 of the power point portion 39 of one arm 35A and the hook 330 of the hoist, and the plate-like suspension hook 53 of the force point portion 39 of the other arm 35B and Linear distances from the hook 330 are denoted by reference numerals W11 and W12, respectively (see FIGS. 2 and 5).

Next, the function and effect of the segment suspension jig 30 will be described.
In the segment suspension jig 30, the arms 35 </ b> A and 35 </ b> B are supported by the fulcrum portion 37 so that the joint pin 31 fitted in the holding hole 301 a of the segment 301 can be freely rotated, and the force point portion 39 of the hoisting machine Since the hooks 330 are attached to the hooks 330 via the wires 54L and 54S, the arms 35A and 35B are raised so that the force point portions 39 are raised with respect to the fulcrum portions 37, respectively. At this time, the action point portion 41 is lowered with respect to the fulcrum portion 37, so that the segment 301 is pushed down by the two push-down portions 36 corresponding to the inner surface thereof and at the two push-down portions 36 corresponding to the side surfaces of the segment 301 in the lateral direction. Suppresses shaking. The segment 301 is pressed down at a plurality of locations by the pressing portions 36 of the arms 35A and 35B.

  In addition, since the pair of arms 35A and 35B is attached to the joint pin 31 so as to be rotatable and crossed when viewed from the front, the joint point 31 is provided at each action point 41 of the pair of arms 35A and 35B. The two pressing portions 36 corresponding to the inner surface press the segments 301 on both sides of the joint pin 31 fitted in the holding hole 301a.

  The pair of arms 35A and 35B have the same shape and are symmetrically combined when viewed from the front (side) so that the pressing by the pair of arms 35A and 35B is equal. When the segment 301 is lifted and transported in a horizontal state with a wire while the joint pin 31 is fitted in the holding hole 301a, the arm 35A (or 35B) on the side inclined (displaced) upward of the segment 301 is used. If the force that presses the segment 301 by the pressing portion 36 is increased, the upwardly inclined side is restrained from moving upward, so that the segment 301 is unlikely to become unbalanced and maintains a horizontal state.

  If the segment 301 is horizontal, concentrated stress is unlikely to occur on the segment holding hole forming surface, which is the surface of the joint pin 31 and the segment 301 that forms the segment holding hole 301a. As a result, the joint pin 31 and the segment 301 are not damaged or deformed. Further, since the segment 301 is difficult to tilt during horizontal transport of the segment, it is not necessary for the operator to be extremely careful about whether the segment 301 collides with surrounding objects, and the burden on the operator is reduced. Therefore, an increase in work efficiency can be expected.

  When the segment 301 is vertically suspended from the horizontal using the segment suspension jig 30, the pulley of the electric chain block 60 is rotated clockwise or counterclockwise in the direction in which the chain 66 extends, so that the strength of the arm 35A is increased. The linear distance Wl1 between the portion 39 and the hoist hook 330 and the linear distance Wl2 between the force point 39 of the arm 35B and the hook 330 are made non-uniform. By doing in this way, the power point part 39 of the arm 35A on the Wl1 side, which has become relatively short, rises, and the segment 301 can be suspended vertically from the horizontal.

  Therefore, even if the passage is narrow after the segment 301 is lifted up to the tunnel, the segment 301 can be easily suspended in the vertical direction, and there is no problem in transporting the segment 301.

  In order to level the segment 301, the pulley of the electric chain block 60 is rotated counterclockwise or clockwise in the direction in which the chain 66 is contracted, so that the force point portion 39 of one arm 35A and the hook 330 of the hoist And the linear distance Wl2 between the force point 39 of the other arm 35B and the hook 330 are made uniform. Therefore, the electric chain block 60 can be said to be a length adjuster that adjusts the length of the linear distance Wl2 of the wire 54S between the force point portion 39 of the other arm 35B and the hook 330.

  Whether the segment 301 is inclined or horizontal, a pair of arms 35A and 35B having the same shape and symmetrical with each other press the plural portions of the segment 301 evenly by the pressing portion 36, so that the segment holding hole 301a Concentrated stress can be prevented from occurring on the forming surface and the joint pin 331.

  In addition, this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

It is a whole perspective view of the segment hanging jig concerning the present invention. It is a front view of the segment hanging jig concerning the present invention. It is a top view of a segment hanging jig concerning the present invention. It is a side view of the segment hanging jig concerning the present invention. It is a figure which shows the state which suspended the segment vertically by the segment suspension jig | tool which concerns on this invention. It is a front view before pressing down a segment with the segment hanging jig concerning the present invention. It is a conceptual diagram of the shield tunnel formed by assembling a plurality of segments. It is a figure which shows the state which has suspended the segment substantially horizontally.

Explanation of symbols

30 Segment suspension jig 31 Joint pin 31a Joint pin lever 33 Arm part 35A / 35B Arm 36 Depressed part 37 Support part 37A / 37B Arm support part 39 Force point part 41 Action point part 43 Reinforcing square pipe 45 For holding segment Pipe structure 49 Rotating shaft 51 Arm support base 53 Hanging hook 54 Wire 54L Long wire 54S Short wire 60 Electric chain block 60u Electric chain block upper hook 60d Electric chain block lower hook 62 Chain block body 64 Electric chain block Pulley 66 Chain 220 Shield tunnel 229 Part of natural ground 300 Excavation hole 301 Segment 301a Segment holding hole 301b Inner surface of segment 301c Side surface of segment 331 Joy Topin 331a joint pin of the lever 330 Hook (suspended instrument)
Wl1 / Wl2 Linear distance between the hanging hook and the hanging tool

Claims (2)

A joint pin which is fitted in the holding hole formed in the segments for the transport segment is a block member for constituting the tunnel wall in the wellbore drilled by the shield excavator,
There is a fulcrum part, a force point part and an action point part, and the joint pin is rotatably supported at the fulcrum part, and a steel cable is attached at the force point part, and a push to press the segment to the action point part A pair of arms to which the part is attached ,
The pair of arms are attached to the joint pin in a state of being pivotable and crossing as seen from the side,
The pair of arms are combined into a line symmetrical figure when viewed from the side,
Of the steel cables attached to the power point, the steel cable related to one arm is locked to the hoisting tool of the hoist, and the steel cable related to the other arm is provided with a length adjusting tool for adjusting the length of the steel cable. A segment hanging jig, which is locked to the hanging tool in an intervening state .   The segment hanging jig according to claim 1, wherein the length adjuster is a chain block used for lifting and lowering heavy objects.

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