JP4624244B2 - Compact structure of tunnel lining concrete - Google Patents

Description

The present invention relates to a compaction structure used Oite the striking設方method tunnel lining concrete to form a lining concrete with tunnel lining for formwork.

  For example, in tunnel construction methods such as the mountain tunnel construction method, a method using a concrete lining formwork is generally used as a method for forming tunnel lining concrete that is constructed to cover the natural ground on the inner peripheral surface of the excavated tunnel. (See, for example, Patent Document 1). As shown in FIGS. 7A and 7B, the concrete lining formwork 50 is formed on the side wall of the tunnel 53 along the inner peripheral surface 54 of the tunnel 53 having a shape including an arch-shaped portion 52 such as a horseshoe shape. Covering space 61 between the installed concrete lining formwork 50 and the ground covered with the sprayed concrete 56 on the inner peripheral surface 54 of the tunnel 53. In addition, lining concrete is formed so as to be continuous with the concrete of the invert portion 51 at the bottom of the tunnel, preferably by placing and hardening unreinforced concrete.

  As the concrete lining formwork 50, for example, a movable tunnel lining formwork called a slide centle is known in addition to an assembly type tunnel lining formwork called a paracentle. As the excavation work proceeds, the concrete lining formwork 50 is moved from the rear to the front in the digging direction of the tunnel 53 while re-installing the concrete lining formwork 50 every predetermined span of, for example, about 10 m. Then, the side and upper lining concrete of the tunnel 53 is sequentially cast and formed.

  Then, in order to place the lining concrete on the side and upper part of the tunnel by using the concrete lining formwork 50, for example, as shown in FIGS. For example, an area from the side wall portion 55 of the tunnel 53 to the shoulder portion of the arch-shaped portion 52 is provided through the inspection window 56 as a height region where concrete can be placed from the inspection window 56 provided in the mold 50. The concrete 57 is supplied and the vibrator 58 is inserted from the inspection window 56, and the concrete 57 is placed while the supplied concrete 57 is compacted. After that, as a height region that is difficult to be compacted by the vibrator 58 while supplying the concrete 57 from the inspection window 56, a region of a crown portion (crown portion) 59 (see FIG. 7A) of the tunnel 53 is used. Is a pattern in which concrete is driven in by a blow-up method from a concrete placing hole 60 as a blow-up opening provided at the top end portion of the concrete lining mold 50, and the concrete 57 of the crown portion 59 is formed without compaction. Is adopted.

More specifically, after the concrete lining formwork 50 is installed at a predetermined position, a side wall 55 is formed in the lining space 61 between the concrete lining formwork 50 and the inner peripheral surface 54 of the tunnel 53. The step of compacting using a vibrator 58 while pouring concrete 57 through the lower inspection window 56 from the lower part (see FIG. 8A), and further toward the arch-shaped part 52 at the upper part of the side wall part 55 The step of compacting using the vibrator 58 while pouring the concrete 57 through the inspection window 56 (see FIG. 8 (b)), and before the crown 59 of the arch-shaped portion 52, the upper inspection window 56 and the necessary Accordingly, the concrete 57 is poured through the concrete placing hole 60 and compacted using the vibrator 58 (see FIG. 8C), and the lining space 6 of the crown 59 The concrete 57 is sequentially poured from the portion on the existing lining concrete 62 side through the concrete placing hole 60, and the concrete 57 is filled to the end form frame 63 without compaction (see FIG. 8D), As a result, the lining concrete is placed.
JP 2002-147193 A

  However, in the conventional lining concrete placement method using the concrete lining formwork 50 as described above, a vibrator 58 is inserted into each of the concrete supplied to the lining space 61 by human power from each inspection window 56. However, since it is necessary to compact the concrete, it takes a lot of work. Further, in order to sufficiently compact the placed concrete 57, it is necessary to disperse the entire concrete lining form 50 and provide a large number of inspection windows 56. In order to perform compaction, many manpowers and setup changes are required, and variations in compaction and local compaction are likely to occur.

The present invention has been made by paying attention to such a conventional problem, and without requiring a lot of manpower and labor, the concrete supplied by mechanical means is sufficiently compacted, To provide a tunnel lining concrete compaction structure that can efficiently lay lining concrete without causing insufficient compaction and can also effectively compact the lining concrete of the crown. With the goal.

The present invention provides a tunnel lining concrete compacted for compacting concrete provided in a tunnel lining formwork and supplied to the lining space between the outer peripheral surface of the tunnel lining and the inner lining surface of the tunnel. A slit part formed in the tunnel lining form by extending in the tunnel axis direction, and from the inside of the tunnel lining form to the lining space through the slit part A vibration plate disposed so as to be able to protrude forward and backward, and an advancing and retreating drive device that is provided inside the tunnel lining formwork and moves the vibration plate forward and backward toward the lining space, A plurality of the slit portions and the diaphragm are arranged in a straight line in the tunnel axis direction to form a diaphragm row, and the diaphragm row is provided in a plurality of rows at intervals in the circumferential direction of the tunnel. And each diaphragm row That a plurality of the vibration plate, by providing a compaction structure of a tunnel lining concrete moves forward and backward integrally via the simultaneous forward and reverse mechanism, in which to achieve the above objects.

  The tunnel lining concrete compaction structure according to the present invention includes a flexible sealing member that seals a gap between the opening peripheral edge of the slit portion and the diaphragm inserted through the slit portion. It is preferable that it is attached.

Further , in the tunnel lining concrete compaction structure of the present invention, the simultaneous advance / retreat mechanism preferably includes a chain and a sprocket.

According to the tunnel lining concrete compaction structure of the present invention, the concrete supplied by the mechanical means is sufficiently compacted without requiring much labor and labor, resulting in variations and insufficient compaction. It is possible to efficiently place the lining concrete without any trouble and to effectively compact the lining concrete of the crown portion.

As shown in FIGS. 1 to 4, for example, in a mountain tunnel construction method, a tunnel lining formwork 10 is used as a tunnel lining concrete placement method in which a compaction structure according to a preferred embodiment of the present invention is adopted . The outer lining surface of the tunnel lining form 10 is used when the lining concrete 11 on the side and upper part of the tunnel 12 is continuously or continuously cast with the invert concrete 13 at the bottom of the tunnel. 10a and the concrete 14 supplied to the lining space 17 between the lining surface 42 where the concrete 41 is sprayed onto the ground 40 on the inner periphery of the tunnel 12 to sufficiently compact and efficiently place the concrete 14 This method has been adopted.

  Here, in this embodiment, the tunnel lining form 10 is, for example, a slide-movable centle known as the prior art, and a predetermined span of, for example, about 10 m as the tunnel 12 excavates. It is possible to sequentially cast and form the lining concrete 11 on the side portion and the upper portion of the tunnel 12 while re-installing the tunnel 12 from the rear to the front in the digging direction X.

  The tunnel lining concrete placement method of the present embodiment is the same as the tunnel lining formwork 10 placement method using the tunnel lining formwork 10, but extends to the tunnel lining formwork 10 in the tunnel axial direction X. A plurality of slit portions 15 are provided, and a plurality of diaphragms 16 are arranged between the outer peripheral surface 10a of the tunnel lining form 10 and the lining surface 42 on the inner periphery of the tunnel 12 through the slit portions 15. It arrange | positions so that it can protrude forward and backward toward the lining space 17 between, and the concrete 17 supplied to the lining space 17 is compacted by vibrating the diaphragm 16 protruded in the lining space 17. It is what I did.

  Moreover, according to this embodiment, the concrete 14 supplied to the lining space 17 between the outer peripheral surface 10a of this and the lining surface 42 of the tunnel 12 inner periphery is compacted to the tunnel lining formwork 10. A compacting structure 18 is provided, and the concrete structure 14 can be compacted by projecting and vibrating the diaphragm 16 toward the lining space 17 by the compacting structure 18. ing.

  That is, the compaction structure 18 provided in the tunnel lining mold 10 extends in the tunnel axial direction X to form the tunnel lining mold 10 as shown in FIGS. The formed slit portion 15 (see FIGS. 2 to 4) and the slit portion 15 are disposed so as to protrude forward and backward from the inside of the tunnel lining form 10 toward the lining space 17. The diaphragm 16 and an advancing / retreating drive device 19 that is provided inside the tunnel lining form 10 and moves the diaphragm 16 back and forth toward the lining space 17. Further, a plurality of compaction structures 18 can be provided in a predetermined position in a distributed manner distributed over the entire tunnel lining form 10, and are supplied by the plurality of compaction structures 18. While the concrete is sufficiently compacted, it is possible to drive the lining concrete 11 over the entire lining space 17 without causing variations or insufficient compaction.

  According to the present embodiment, the slit portion 15 is a vertically long strip-shaped slit opening having a width of about 5 to 10 mm and a length of about 1500 mm, for example, and is arranged so that its longitudinal direction is along the tunnel axis direction X. Thus, a plurality of tunnel lining molds 10 are formed (see FIG. 2). Further, a flexible seal member 20 is attached to the slit portion 15 to seal a gap between the opening peripheral edge of the slit portion 15 and the diaphragm 16 inserted through the slit portion 15.

  The flexible sealing member 20 is made of a flexible plate-like member such as a rubber plate having a thickness of about 10 mm, for example, and has a vertically long belt-like planar shape that is slightly larger than the opening shape of the slit portion 15. The flexible seal member 20 is attached so as to cover the slit portion 15 by joining the peripheral portion thereof to the opening peripheral portion of the slit portion 15 in the outer peripheral surface 10a of the tunnel lining mold 10. A sliding cut 21 is cut in the central portion of the flexible seal member 20 so as to extend in the tunnel axis direction X, and the diaphragm 16 is inserted into the sliding cut 21 to be slid. In addition, while sealing the gap between the opening periphery of the slit portion 15 and the diaphragm 16, it is possible to smoothly advance and retract toward the lining space 17 while preferably vibrating the diaphragm 16. Further, since the flexible seal member 20 is provided, when the concrete 14 supplied to the lining space 17 is compacted, the concrete 14 passes through the slit portion 15 to form the tunnel lining form 10. It is possible to effectively avoid leakage into the inside of the.

  The diaphragm 16 is made of, for example, a metal plate or a synthetic resin plate having a thickness of about 3 to 5 mm, and has a substantially rectangular planar shape having a length of about 1500 mm and a height of about 500 to 600 mm. Yes. The diaphragm 16 is attached with a known wall vibrator 22 in an adhesive state, for example, including an electromagnetic vibrator or a vibrator that vibrates due to the rotational force of a motor, in the center of the lower side portion thereof. The drive of the wall vibrator 22 generates vibrations for compacting the concrete 14.

  An advancing / retracting drive device 19 for moving the diaphragm 16 forward and backward toward the lining space 17 is supported by a pair of main body frame portions 24 fixed to the centle frame 23 of the tunnel lining mold 10, and the main body frame portions 24 It comprises a pair of advance / retreat hydraulic cylinders 25 as cylinder mechanisms that are supported and fixed. Each forward / backward hydraulic cylinder 25 includes a fixed sleeve portion 26 fixed to the distal end portion of the main body frame portion 24, and a cylinder rod 27 with a bellows that preferably extends and contracts from the fixed sleeve portion 26. A gripping tool 28 capable of gripping the diaphragm 16 while integrally absorbing the vibration of the diaphragm 16 by a buffer member is integrally provided at the distal end of 27.

  The diaphragm 16 is supported by a pair of advancing and retreating hydraulic cylinders 25 so that both sides of the lower side portion thereof are gripped by a gripping tool 28, and the cylinder rod 27 contracts, for example, by expanding and contracting the cylinder rod 27. The cylinder rod 27 is extended from the state in which the diaphragm 16 is housed inside the tunnel lining mold 10 without protruding from the outer peripheral surface 10a of the tunnel lining mold 10, and the flexible seal member 20 is slid. The diaphragm 16 can be easily moved toward the lining space 17 while controlling the protruding amount until the diaphragm 16 protrudes into the lining space 17 with a maximum overhang length of, for example, about 250 mm through the dynamic cut 21. You can move forward and backward.

FIGS. 6A to 6D show a compaction structure 29 according to a preferred embodiment of the present invention employed in the tunnel lining concrete placing method of the present embodiment. According to the above, the plurality of slit portions 15 and the diaphragm 16 are arranged so as to be linearly arranged in the tunnel axis direction X to form the diaphragm array 30 (see FIGS. 2 to 4), and the diaphragm array 30 Are arranged at intervals in the circumferential direction of the tunnel (see FIGS. 2 to 4), and the plurality of diaphragms 16 in each diaphragm row 30 advance and retract as a unit via the simultaneous advance / retreat mechanism 31. It is like that.

  That is, the simultaneous advance / retreat mechanism 31 also has a function as an advance / retreat drive device, and is supported by the support frame 32 attached to the center frame 23, and a pair of sprockets 33 arranged on both sides of each diaphragm 16. The chain 35 is continuously wound and engaged with the sprocket 33 of each diaphragm 16 and both ends are connected to a chain driving hydraulic cylinder 34 provided in the center inner portion of the tunnel lining mold 10. It is comprised by. A meshing guide member 36 that is engaged with, for example, the rotation shaft of the sprocket 33 is attached to each diaphragm 16 at each side portion thereof, and when the sprocket 33 is rotated by the rotational movement of the chain 35, the sprocket 33. By moving the meshing guide member 36 up and down along the direction, each diaphragm 16 can be smoothly advanced and retracted toward the lining space 17. In addition, adjacent to each meshing guide member 36, each diaphragm 16 is formed with a guide slit 37 through which the rotation shaft of the sprocket 33 is inserted, and the sprocket is moved forward and backward when the diaphragm 16 is moved forward and backward. The rotation shaft 33 is slid along the guide slit 37 to avoid interference with the diaphragm 16.

  In the above-described compaction structure 29 including the simultaneous advance / retreat mechanism 31, the chain drive hydraulic cylinder 34 is driven to rotate the chain 35 to the right side or the left side, whereby the pair of sprockets 33 of each diaphragm 16 are continuously connected. The chain 35 engaged in this manner slides to the left or right and rotates the plurality of sprockets 33 in synchronization. Thus, the plurality of diaphragms 16 in each diaphragm row 30 can be advanced and retracted integrally toward the lining space 17.

  In this embodiment, in order to place the lining concrete 11, as shown in FIG. 2, for example, the concrete 14 is supplied from the concrete charging port 38 provided in the crown portion (crown portion) of the tunnel lining formwork 10. Is supplied to the lining space 17, and a plurality of diaphragms 16 are removed from each slit portion 15 of the diaphragm row 30 provided in the lower stage and / or the middle stage by, for example, a compacting structure 29 including a simultaneous advance / retreat mechanism 31. A plurality of diaphragms 16 are inserted into the supplied concrete 14 while vibrating, and the concrete 14 is compacted to place the lining concrete 11 on the side wall portion.

  When the concrete 14 supplied to the side wall portion is sufficiently compacted, the diaphragm 16 is pulled out from the lining space 17, and the concrete 14 is further introduced from the concrete charging port 38 provided in the crown portion, thereby lining the space. As shown in FIG. 3, the entire covering space 17 above the tunnel arch part including the crown part, preferably above the side wall part, is filled with the concrete 14.

  If the entire lining space 17 at the upper part of the tunnel arch part is filled with concrete 14, as shown in FIG. 4, a plurality of tunnel lining forms 10 provided on the upper part of the tunnel arch part including the crown part are provided. A plurality of diaphragms 16 are integrally projected toward the lining space 17 from the respective slits 15 of the diaphragm row 30 and inserted into the supplied concrete 14 while being vibrated. The lining concrete 11 is compacted. When the concrete 14 supplied to the upper part of the tunnel arch portion is sufficiently compacted, the diaphragm 16 of each diaphragm row 30 is pulled out from the lining space 17 and in the span where the tunnel lining formwork 10 is installed. The placing work of the lining concrete 11 is completed.

  According to the present embodiment, the concrete 14 supplied to the lining space 17 is sufficiently compacted by mechanical means without requiring a lot of manpower and labor, resulting in variations and insufficient compaction. It is possible to efficiently place the lining concrete 11 without any problems, and to effectively compact the lining concrete 11 in the crown portion.

  That is, according to the present embodiment, a plurality of slit portions 15 are provided in the tunnel lining formwork 10, and the plurality of diaphragms 16 protrude through the slit portions 15 so as to advance and retract toward the lining space 17. The concrete supplied to the lining space 17 is compacted without human intervention while vibrating the diaphragm 16 protruding into the lining space 17, and the lining concrete 11 is placed. Therefore, the vibration of the diaphragm 16 can be mechanically controlled without the need for laborious work such as compacting the concrete while manually inserting the vibrator through the inspection windows provided in the concrete lining formwork. By operating it, it becomes possible to place the lining concrete 11 efficiently. Further, the slit portion 15 and the diaphragm 16 can be easily provided on the tunnel lining mold 10 above the tunnel arch portion including the crown portion. The diaphragm 16 provided on the crown portion covers the crown portion. The concrete 11 can be effectively compacted.

  Furthermore, according to the present embodiment, for example, when placing the lining concrete 11 of a mountain tunnel, it is possible to perform compaction widely in the thickness direction of the lining. It is possible to improve the quality of the lining concrete 11, and in particular, it is possible to finish the surface of the lining concrete 11 cleanly. Furthermore, by adjusting the insertion depth of the diaphragm 16, it becomes possible to easily cope with a change in the thickness of the lining concrete 11.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to form the tunnel lining concrete compaction structure of the tunnel lining concrete of the present invention as a whole on the side and upper lining concrete of the tunnel, for example, to the lower part of the tunnel crown through a conventional inspection window. Covering concrete is laid by a method of supplying concrete or compacting, and for the lining concrete of the crown part, the diaphragm is arranged through the slit part arranged in the tunnel crown part of the tunnel lining formwork. Can be projected into the lining space, and the concrete supplied to the lining space of the tunnel crown can be compacted to place the lining concrete.

Further , the present invention can be adopted to form lining concrete in other tunnels other than the mountain tunnel, and the lining surface that forms the lining space between the outer periphery of the tunnel lining formwork is In addition to natural ground covered with sprayed concrete, it may be a lining surface for performing secondary lining by the inner peripheral surface of the tunnel after performing primary lining. Furthermore , apparatuses and members other than the compaction structure having the above-described configuration can be used .

In the tunnel lining concrete placement method in which the compaction structure according to a preferred embodiment of the present invention is employed, the tunnel axial direction indicates a state in which the tunnel lining formwork is installed along the lining surface of the inner periphery of the tunnel It is sectional drawing seen from. It is a schematic perspective view explaining the work procedure of the tunnel lining concrete placing method in which the compaction structure according to a preferred embodiment of the present invention is adopted . It is a schematic perspective view explaining the work procedure of the tunnel lining concrete placing method in which the compaction structure according to a preferred embodiment of the present invention is adopted . It is a schematic perspective view explaining the work procedure of the tunnel lining concrete placing method in which the compaction structure according to a preferred embodiment of the present invention is adopted . (A) is a side view showing the left half in section, (b) is a sectional view taken along line A-A in (a), and (c) is ( It is sectional drawing along BB of a). The structure of the compaction structure of the tunnel lining concrete which concerns on preferable one Embodiment of this invention is demonstrated , (a) is a side view, (b) is a principal part expanded side view, (c) is C- of (b). Sectional drawing along C, (d) is sectional drawing along DD of (b). (A) is sectional drawing seen from the tunnel axial direction which shows the state which installed the concrete lining formwork along the lining surface of a tunnel inner periphery in the conventional tunnel lining concrete placement method, (b) is the same side surface FIG. (A)-(d) is a side view which shows the work procedure of the conventional tunnel lining concrete placement method, and shows one part as sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concrete lining formwork 10a Outer surface 11 of tunnel lining formwork 11 Covering concrete 12 Tunnel 13 Invert concrete 14 Concrete 15 Slit part 16 Diaphragm 17 Covering space 18, 29 Compaction structure 19 Advance / retreat drive device 20 Possible Flexible sealing member 21 Sliding cut 22 Wall vibrator 23 Centle frame 24 Main body frame portion 25 Hydraulic cylinder 26 for advance / retreat 26 Fixed sleeve portion 27 Cylinder rod 28 Grip tool 30 Diaphragm row 31 Simultaneous advance / retreat mechanism 32 Support frame 33 Sprocket 34 Chain drive Hydraulic cylinder 35 Chain 36 Engagement guide member 37 Guide slit 38 Concrete inlet 40 Ground ground 41 on the inner periphery of the tunnel Sprayed concrete 42 Covering surface X Tunnel axial direction (tunnel excavation direction)

Claims (3)

A tunnel lining concrete compaction structure for compacting concrete provided in a tunnel lining formwork and compacted in the lining space between the outer peripheral surface of the tunnel lining and the inner lining surface of the tunnel. ,
A slit portion extending in the tunnel axis direction and formed in the tunnel lining formwork, and projecting from the inside of the tunnel lining formwork toward the lining space through the slit portion. A vibration plate disposed so as to be capable of being provided, and an advancing and retreating drive device that is provided inside the tunnel lining formwork and moves the vibration plate forward and backward toward the lining space ,
A plurality of the slit portions and the diaphragm are arranged in a straight line in the tunnel axis direction to form a diaphragm row, and the diaphragm row is provided in a plurality of rows at intervals in the circumferential direction of the tunnel. A tunnel lining concrete compaction structure in which a plurality of the diaphragms in each diaphragm row advance and retreat as a unit via a simultaneous advance and retreat mechanism . 2. The tunnel lining concrete according to claim 1 , wherein a flexible sealing member that seals a gap between an opening peripheral edge of the slit portion and the diaphragm inserted through the slit portion is attached to the slit portion. Compaction structure. The tunnel lining concrete compaction structure according to claim 1 or 2 , wherein the simultaneous advance / retreat mechanism includes a chain and a sprocket.

Images