JP2017186882A - Assembling method of formwork support device for tunnel covering concrete formation, and net support tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a fallen object to be adequately received during assembly of a formwork support device.SOLUTION: Multiple net support tools 50 are supported outside a leg of a formwork support device in assembling the formwork support device for tunnel covering concrete construction, and then a net 61 is supported by the net support tools 50. The net support tool 50 has a fitting part 51, which can be fitted to the formwork support device, a support part that is supported by a tip of the fitting part 51 so as to protrude from the tip, and a mooring part, which is formed at least on the support part and can moor the net.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for assembling a formwork support device for supporting a formwork for forming a tunnel lining concrete, and a net support used in the assembling method.

For example, Patent Document 1 discloses a formwork support device that supports a formwork for forming tunnel lining concrete.
When tunnel lining concrete is molded using this type of formwork support apparatus, as shown in FIGS. 11A and 11B, a front dome-shaped formwork 101 is formed on the formwork support apparatus 10. Is supported. The mold 101 includes a ceiling form 102, a pair of side forms 103, and a pair of invert forms 104. Then, concrete is placed between the outer peripheral surface of the mold 101 and the inner wall surface of the tunnel 105, and the tunnel lining concrete 106 is formed.

  By the way, in the method of assembling the formwork support apparatus 10, it is preferable that a means for receiving a fallen object such as a part dropped from the upper structure is provided on the outer side of the apparatus 10.

Japanese Patent Laid-Open No. 2005-282096

However, the technique disclosed in Patent Document 1 does not mention the means for receiving the falling object as described above.
An object of the present invention is to provide a method for assembling a formwork support apparatus that can appropriately receive a fallen object in the assembly work of the formwork support apparatus. Another object of the present invention is to provide a net support that can easily install a net for receiving a fallen object.

  In order to achieve the above object, in the method for assembling a formwork support apparatus of the present invention, in assembling the formwork for tunnel lining concrete construction, a plurality of nets are supported outside the legs of the support apparatus. The tool is supported, and then the net is supported by the net support tool.

According to such a method, the net can be easily supported on the outer side of the leg portion by the net support, and a falling object can be received by the net.
Further, in the net support of the present invention, an attachment portion that can be attached to the formwork support device, a holding portion supported in a protruding state from the tip of the attachment portion, and provided at least in the holding portion, A mooring section capable of mooring a net is provided.

  In such a configuration, if the attachment portion is attached to the formwork support device, the net can be easily stretched on the formwork support device by mooring the net to the mooring portion of the holding portion.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which can stretch | tension the net | network for receiving a falling object easily with respect to a formwork support apparatus.

(A) is a side view which shows the installation state of a traveling apparatus, (b) is a front view similarly. (A) is a side view which shows the installation state of a leg material, (b) is a front view similarly. (A) is a side view which shows the temporary placement state of a truss material, (b) is a front view similarly. (A) is a side view which shows the assembly | attachment state of a stay, (b) is a front view similarly. (A) is a side view showing the assembled state of the outer scaffold and the net support of the first embodiment, and (b) is a front view of the same. (A) is a side view which shows the assembly | attachment process of a leg part, (b) is a front view similarly. (A) is a side view which shows the installation state of a center part net | network, (b) is a front view similarly. (A) is a side view which shows the installation state of a girder, (b) is a front view similarly. (A) is a side view which shows the installation state of an overhanging scaffold and a staircase, (b) is a front view similarly. (A) is a side view which shows the assembly | attachment state of a ceiling foam, (b) is a front view similarly. (A) is a side view which shows the assembly | attachment state of a formwork, (b) is a front view similarly. (A) is a partial cross-section exploded front view of the net support of the first embodiment, and (b) is also a partially enlarged cross-sectional view. The side view which shows the assembly | attachment state of the net support tool of 2nd Embodiment. (A) is a partial cross-sectional exploded front view of a net support, (b) is a partially enlarged cross-sectional view showing a fixing portion by a fastening screw, and (c) is a partially enlarged perspective view showing a tip portion of the fastening screw.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.
[First embodiment]
The assembly method and configuration of the first embodiment will be described with reference to the drawings of FIGS.

(Traveling devices 12, 13 etc.)
As shown in FIGS. 1A and 1B, a pair of rails 11 extending in advance toward the inside of the mine (inside the tunnel) are laid outside the mine (outside of the tunnel). The traveling devices 12 and 13 are placed at front and rear positions on the left and right rails 11. The left side of FIG. 1 is the lap side of the tunnel, and the right side is the wife side. In the traveling devices 12 and 13, wheels 15 are provided on the frame 14, and the wheels 15 can roll on the rails 11. On the other hand (the lap side in the embodiment), the traveling device 12 includes a motor 16 for driving the wheels 15 to rotate.

  Mounting brackets 17 are attached to the frames 14 of the traveling devices 12 and 13 by bolts and nuts 18 at two locations on the lap side and the wife side. In the following description, bolts and nuts are simply referred to as bolts. In this case, a bolt may be screwed into a tap hole formed in the mold support device without using a nut. The receiving device 20 screwed into the screw portion on the upper side of the jack 19 with the inner peripheral female screw can be adjusted in the vertical position by the action of the screw. The mounting bracket 17 is placed and supported on the receiving member 20. For this reason, the frame 14 is supported by the jack 19. A total of four jacks 19 are provided in each of the traveling devices 12 and 13, and are located on both sides of the rail 11 on the lap side and the wife side of the frame 14.

  Therefore, by adjusting the height of the receiving member 20 by the action of the screw and placing the lower end of the jack 19 on the ground E, the traveling devices 12 and 13 are connected to the wheels via the four-legged jack 19 and the receiving member 20. In the state where 15 is located on the rail 11, it can be stably supported in a horizontal posture.

The traveling devices 12 and 13 constitute the lower end of the leg portion 34 of the mold support device 10.
(Leg material 24 of leg 34, etc.)
Next, as shown in FIGS. 2A and 2B, a leg member 24 is assembled to the upper surface of the bracket 23 on the shaft 22 of each traveling device 12, 13 by a bolt (not shown). Between the side shaft 241 and the shaft 141 on the upper surface of the frame 14 of the traveling devices 12 and 13, a jack-like support member 26 whose length is adjustable by the action of a screw is interposed. The support member 26 holds the leg member 24 as a lower leg member in an upright state.

  A connecting member 27 made of H-shaped steel is connected between the left and right leg members 24 by bolts 28. The connecting member 27 includes a pair of connecting pieces 271 and 272, and both connecting pieces 271 and 272 are connected to each other by a bolt 29 via a connecting plate 278. A jack 30 as an installation member is provided between the connecting portions of the connecting pieces 271 and 272 and the ground E. That is, the lower surfaces of the connecting pieces 271 and 272 are supported by the support 31 on the screw portion of the jack 30. For this reason, the connecting pieces 271 and 272 are held in a straight line without being bent apart from each other.

The bracket 33 is welded and fixed in advance to the upper surface of the distal end portion of the connecting pieces 271 and 272.
The connecting member 27 having the bracket 33 constitutes a connecting means.

(Such as truss 42)
Next, as shown in FIGS. 3 (a) and 3 (b), at positions disengaged from both rails 11, there are gantry 41 made of steel, respectively, at a total of four positions on the lap side and wife side of the ground E. The left and right truss members 42 are temporarily placed between the gantry 41 before and after the left and right positions (the lap side and the wife side). A pair of support pieces 43 are fixed to each gantry 41 in advance by welding or the like. Then, the truss member 42 is fixed to each support piece 43 by the clamp fitting 44 in an upright state.

(Girder material stay 45, etc.)
Next, as shown in FIGS. 4 (a) and 4 (b), the beam material receiving stay 45 is assembled to the opposite side surfaces of the truss members 42 by bolts 46. In addition, a plurality of skeletons 471 of the outer scaffold 47 are assembled by bolts 48 on the side surface of the truss member 42 opposite to the girder receiving stay 45. A scaffold plate (not shown) is bridged on the upper surface of the skeleton 471 of the outer scaffold 47. The truss member 42 and the girder receiving stay 45 constitute an upper leg member, and the truss member 42, the girder receiving stay 45 and the leg member 24 constitute a leg main body 35.

(Net support 50 etc.)
Next, as shown in FIGS. 5A and 5B and FIGS. 12A and 12B, the net support 50 is assembled to the lower side of the skeleton 471 of the outer scaffold 47. The net support 50 includes a support member 51. The support member 51 includes a horizontal attachment portion 52 that has a pipe shape, and a support pipe 53 that is fixed to the tip of the attachment portion 52 in an inclined manner. The angle θ of the axis L2 of the support pipe 53 with respect to the axis L1 of the mounting portion 52 is preferably an acute angle of any angle within the range of 0 to 40 degrees. The attachment portion 52 is fixed to the outer scaffold 47 by an attachment fitting 54 made up of a plurality of clamp fittings.

  A holding pipe 56 is inserted into the support pipe 53. Accordingly, the holding pipe 56 is inclined at the angle θ with respect to the mounting portion 52 as in the case of the support pipe 53. A plurality of retaining holes 57 are formed in the holding pipe 56 at intervals along the axial direction.

  A plate 532 having a screw hole 531 is fixed to the support pipe 53 by welding or the like. A plunger 59 is screwed into the screw hole 531 with a screw 591 on the outer periphery thereof. A ball 592 in the plunger 59 is engaged with the inner peripheral edge of the retaining hole 57 by the spring force of the spring 58. Then, with the holding pipe 56 moved up and down (in the extending direction of the axis L2) and adjusted in position, the holding pipe 56 is required from the support pipe 53 by the engagement between the plunger 59 and the inner peripheral edge of the stop hole 57. It is held at the vertical position of the protruding amount. Further, the protruding length of the holding pipe 56 from the support pipe 53 can be changed by moving the holding pipe 56 against the holding force due to the spring force of the spring 58. When the required protruding length is reached, the holding pipe 56 can be fixed by the engagement of the ball 592 with the stop hole 57.

A net mooring tool 60 is attached to each end of the attachment portion 52 and the holding pipe 56.
Then, the side nets 61 are stretched on the outer sides of the truss members 42 by mooring both end portions of the side nets 61 to the net anchoring tool 60. The side net 61 receives a fallen object from above the net 61.

  When a downward force is applied to the holding pipe 56 via the side net 61 due to falling objects, the holding pipe 56 forms an acute angle θ of 40 degrees or less with respect to the support pipe 53. In other words, since the acute angle θ is 40 degrees or less with respect to the horizontal plane, the holding pipe 56 is restrained from moving in the axial direction and receives the downward force.

(Truss material 42 and support material 65 etc.)
As shown in FIGS. 6A and 6B, a bracket 62 is fixed to the lower side of the beam receiving stay 45 by a clamp fitting 63.

  Next, the truss member 42 is transported from above the gantry 41 onto the leg member 24 using a tow boom (not shown), placed on the leg member 24, fixed by the bolt 67, and the leg main body 35. Is configured. Then, as shown in FIGS. 6A and 6B and FIGS. 7A and 7B, a support member is provided between the bracket 62 on the beam receiving stay 45 and the bracket 33 of the connecting member 27. 65 is interposed. The support member 65 has a jack-like structure having a screw 651 and can be adjusted in length by the action of the screw 651. The leg main body 35 and the traveling devices 12 and 13 constitute a leg 34, and the leg 34 is held upright by the support material 65.

(Center net 71 etc.)
Next, as shown in FIGS. 7A and 7B, the center net 71 is stretched between the upper portions of the left and right girder receiving stays 45 using a clamp fitting 72. The center net 71 is for receiving a fallen object in a subsequent process of assembling the formwork support device 10 thereafter.

(Girder 73 etc.)
Next, as shown in FIGS. 8A and 8B, a plurality of girders 73 are placed between the upper ends of the left and right leg portions 34 at the front and rear, and fixed by bolts 74. . At this stage, the formwork support apparatus 10 exhibits a portal shape as a whole.

(Removal of support member 65, etc.)
Next, an overhanging scaffold (not shown) is assembled to the leg part 34, and an elevating staircase (not shown) is assembled to the overhanging scaffold. A scaffold plate (not shown) is bridged on the upper surface of the overhanging scaffold.

  9 (a) and 9 (b), the side net 61, the central net 71, the connecting material 27, the support material 65, etc. are removed and removed, and the traveling devices 12, 13 are removed. The jack 19 is removed. That is, since the girder 73 is attached to the upper end of the leg portion 34, the formwork support device 10 forms a gate shape and has a stable shape, so that the support material 65 and the like for supporting the leg portion 34 are not necessary. . In addition, since the scaffolding board is bridged between the upper surface of the overhanging scaffold and the girders, the side net 61 and the central net 71 are not required. However, the side net 61 and the central net 71 do not need to be removed because they do not get in the way.

(Equipment such as formwork 101)
Thereafter, various components and equipment are mounted on the mold support device 10, and the assembly of the mold support device 10 is completed.

  Then, as shown in FIGS. 10A and 10B and FIGS. 11A and 11B, the formwork support device 10 is driven on the rail 11 by the driving of the motor 16 of the travel device 12, and the tunnel 105 is obtained. It is moved from the outside into the tunnel 105, the formwork 101 is supported on the formwork support device 10, and concrete 106 for tunnel lining is placed. The formwork 101 may be supported on the formwork support device 10 outside the tunnel 105, and then the formwork support device 10 may be moved into the tunnel 105 together with the formwork 101.

The disassembly of the formwork support apparatus 10 after the hardening of the tunnel lining concrete 106 is performed in a work process in the reverse order to the work process described above.
The present embodiment has the following effects.

  (1) As shown in FIGS. 6 and 7, when the formwork support apparatus 10 is assembled, a connecting member 27 is installed between the legs 24 of the legs 34. A support member 65 is interposed between the beam receiving stay 45 and the connecting member 27 constituting the leg member 24. Therefore, the leg part 34 can be stably held in an upright state, and the assembly work of the formwork support apparatus 10 can be performed efficiently.

  (2) Since the connecting portions of the connecting pieces 271 and 272 of the connecting material 27 are supported by the jack 30 installed on the ground E, the connecting material 27 is maintained in a straight line without being bent. Therefore, the leg 34 can be stably held in an upright state via the support member 65.

  (3) Since the support member 65 is provided between the connecting member 27 between the leg members 24 and the beam member receiving stay 45, the support member 65 does not protrude outside the leg portion 34. For this reason, it can avoid that the support material 65 obstructs the passage of the vehicle which passes the side of the leg part 34, etc., and the assembly operation | work of the formwork support apparatus 10 can be performed efficiently.

  (4) As shown in FIG. 1, the traveling devices 12 and 13 can be stably supported on the rail 11 using a jack 19. Therefore, the assembly of the leg member 24 on the traveling devices 12 and 13 and the assembly of the connecting member 27 between the leg members 24 can be easily and stably performed.

  (5) As shown in FIG. 5, the support member 51 is provided on the outer scaffold 47 and the side net 61 is stretched on the mounting bracket 54 on the support member 51. It can be performed easily and in a short time, and the side net 61 can be maintained in a stable tensioned state without being displaced.

  (6) The holding pipe 56 that anchors the outer side of the side net 61 is supported by the support pipe 53, in other words, at an angle θ that forms an acute angle with the horizontal plane. As a result, even if a downward force is applied to the holding pipe 56 due to the weight of the side net 61 or the weight of the fallen object received on the side net 61, the holding pipe 56 does not move in the axial direction. It is possible to suppress movement in the downward direction, that is, in a direction in which the protrusion amount decreases.

  (7) As shown in FIG. 12, the holding pipe 56 of the support member 51 can adjust the amount of outward protrusion, and is elastically held by the plunger 59 at an arbitrary protruding position. Therefore, for example, when assembling the mold 101, the holding pipe 56 can be moved inwardly against the elastic force of the plunger 59, and therefore the amount of protrusion can be reduced. Conversely, if the holding pipe 56 is moved outward against the elasticity of the plunger 59, the amount of protrusion can be increased. Thus, the protrusion amount of the holding pipe 56 can be easily adjusted as necessary.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the configuration of the net support 50 is different from that of the first embodiment.

  That is, as shown in FIGS. 13 and 14 (a) to (c), the plunger 59 is not provided in the second embodiment. Instead, a female screw member 130 made of a nut is fixed to the support pipe 53. A through hole 131 is formed in the support pipe 53 so as to face the screw hole of the female screw member 130. A fastening screw 132 made of a wing screw is screwed onto the female screw member 130. The holding pipe 56 is not formed with the stop hole 57 of the first embodiment.

  The holding pipe 56 is fixed by the tightening screw 132 tightening the outer peripheral surface of the holding pipe 56 through the through hole 131. Accordingly, by loosening the tightening screw 132, the protruding length of the holding pipe 56 from the support pipe 53 can be adjusted steplessly.

In the second embodiment, the anchoring tool 60 at the tip of the holding pipe 56 is welded to the holding pipe 56.
Accordingly, the second embodiment has the following effects.

  (8) The plunger 59 having the ball 592 and the spring 58 is not provided, and the protruding length of the holding pipe 56 can be adjusted steplessly. Therefore, the number of parts is reduced and the configuration is simplified. Further, since the anchoring tool 60 at the tip of the holding pipe 56 is welded to the holding pipe 56, the number of parts is similarly reduced, and the configuration is simplified.

  In the second embodiment, a plurality of recesses or holes are formed in the holding pipe 56 at intervals in the length direction, and the tip of the tightening screw 132 is engaged with the recesses or holes. Also good.

(Example of change)
The present invention is not limited to the embodiment described above, and may be embodied in the following manner.

In the net support 50, the angle θ of the support pipe 53 with respect to the attachment portion 52 is set to zero degrees.
-Provide both net anchors 60 on the holding pipe 56.

-Assemble the formwork support device in the tunnel 105.
(Other technical ideas)
The technical idea grasped from the embodiment is as follows.

  (A) The mounting portion has a cylindrical portion at the tip thereof, and the supporting portion is supported by the cylindrical portion so that the position of the supporting portion can be adjusted in the length direction, and the supporting portion is held between the cylindrical portion. The net support of Claim 2 or 3 which has a holding | maintenance part.

(B) The net support according to any one of claims 2 and 3 or the technical idea (A), wherein the mooring part is provided in the support part and the attachment part.
(C) The technical idea (A) wherein the holding portion is supported so as to be able to be inserted into and removed from the mounting portion, and means (such as a plunger 62) for fixing the holding portion to the mounting portion is provided. The net support according to any one of items (B) and (B).

  DESCRIPTION OF SYMBOLS 10 ... Formwork support apparatus, 34 ... Leg part, 50 ... Net support, 52 ... Mounting part, 60 ... Mooring part, 61 ... Net.

Claims (3)

In assembling the formwork support device that supports the formwork for tunnel lining concrete construction,
A method for assembling a formwork support apparatus for forming tunnel lining concrete, wherein a plurality of net supports are attached to the outside of the legs of the formwork support apparatus, and then the net is supported by the net support equipment. A mounting portion that can be attached to a formwork support device for supporting a formwork for tunnel lining concrete construction;
A holding part supported in a protruding state from the tip of the mounting part;
A net support provided with at least a mooring part provided on the holding part and capable of mooring the net.   The net support according to claim 2, wherein the holding portion is extended in a direction that forms an acute angle with a horizontal plane.

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