JPH11173087A - Reinforcing structure of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fitting work of reinforcing boards onto the inner peripheral face of a tunnel wall body and reduce the construction period and integrally unify securely the reinforcing board onto the inner peripheral face of the tunnel wall body. SOLUTION: Mortar is injected in the gap between reinforcing boards 2 installed along the inner peripheral face 4a of a tunnel wall body 4 and the inner peripheral face 4a to integrally unify the reinforcing boards 2 and the tunnel wall body 4. A key plate is inserted into a fixing groove at the upper end of split reinforcing boards 5 split at the central part in the breadthwise direction of the tunnel and installed oppositely to each other to connect the reinforcing boards 2. Distance-adjustable spacers 8 projecting toward the inner peripheral face 4a of the tunnel wall body 4 are provided in the upper and lower split reinforcing boards 5a, 5b constituting the split reinforcing board 5. The distance-adjustable spacers 8 are constituted of a nut member fixed to the outside face of the board body constituting the upper and lower split reinforcing boards 5a, 5b and a bolt screwed in the nut member to adjust the protruding length toward the outside by adjusting the screwed length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel reinforcement structure in which a reinforcing plate is attached to an inner peripheral surface of a tunnel wall constituting a tunnel to reinforce a water tunnel in a hydroelectric power plant or the like. Things.

[0002]

2. Description of the Related Art For example, in a hydroelectric power plant or the like, a water guide tunnel for guiding water to a turbine or the like is constructed underground. By the way, in such a water conveyance tunnel, as the years pass, the inner peripheral surface of the tunnel wall constituting the water conveyance tunnel deteriorates, and the necessity of reinforcement arises. Conventionally, to reinforce this tunnel, a reinforcing plate made of a metal plate or the like is installed along the inner peripheral surface of the tunnel wall constituting the tunnel, and mortar is inserted between the reinforcing plate and the inner peripheral surface of the tunnel. Is generally adopted.

[0003]

In the case where a reinforcing plate is installed on the inner peripheral surface of the tunnel wall of the water guide tunnel as described above, the reinforcing plate divided into a plurality of pieces is carried into the water guide tunnel, and a plurality of these reinforcing plates are carried. Split reinforcement plate in the water conduction tunnel,
Workers are manually assembled one by one along the inner peripheral surface of the tunnel wall, but since these reinforcing plates are connected to each other by bolts and nuts, the work requires a lot of work, However, there is a problem that the time is prolonged. In addition, until the reinforcing plates are connected to each other and supported along the inner peripheral surface of the tunnel wall surface, the reinforcing plates must be supported by the shoring, and the supporting work by the shoring and the removal of the shoring It took a lot of work. In addition, when mortar as a backfill material is injected between the reinforcing plate and the inner surface of the tunnel wall, the lower side of the reinforcing plate slightly swells inward due to the injection pressure and the weight of the mortar, and On the side, the reinforcing plate was too close to the inner peripheral surface of the tunnel wall, and there was a risk that the integration of the reinforcing plate with the inner peripheral surface of the tunnel wall would be insufficient.

The present invention has been made in view of the above circumstances, and can be performed extremely easily and in a short period of time, and aims to surely integrate a reinforcing plate into the inner peripheral surface of a tunnel wall. The purpose of the present invention is to provide a tunnel reinforced structure that can be used.

[0005]

According to a first aspect of the present invention, there is provided a reinforcement structure for a tunnel, wherein a substantially U-shaped tunnel wall is constructed from both sides of a bottom surface of the tunnel. A reinforcing plate is installed along the inner peripheral surface of the body, and the reinforcing plate is integrated with the inner peripheral surface of the tunnel wall by injecting backfilling material into the inner peripheral surface of the reinforcing plate and the tunnel wall. The reinforcing structure of a tunnel to be reinforced, the reinforcing plate protrudes and abuts on the inner peripheral surface side of the tunnel wall, the gap with the inner peripheral surface of the tunnel wall,
It is characterized in that a plurality of spacers are provided to secure against the injection pressure of the backfill material injected into the gap.
In other words, the spacing between the reinforcing plate and the inner peripheral surface of the tunnel wall is ensured by the spacer provided on the reinforcing plate, so that when the backfill material is injected into the gap, the gap is formed by the injection pressure of the backfill material. However, the inconvenience of partially becoming wider or narrower is eliminated.

According to a second aspect of the present invention, there is provided the tunnel reinforcing structure according to the first aspect, wherein the spacer is capable of moving back and forth in a protruding direction thereof. Thus, by moving the spacer forward and backward, the gap between the reinforcing plate and the inner peripheral surface of the tunnel wall can be adjusted very easily.

According to a third aspect of the present invention, in the tunnel reinforcing structure according to the first or second aspect, the reinforcing plate is divided into a plurality in the axial direction of the tunnel.
And it consists of divided reinforcing plates divided from the center in the tunnel width direction, and upper ends of these divided reinforcing plates are connected at the top of the tunnel, and the upper ends of the divided reinforcing plates extend in the longitudinal direction. A locking groove is formed, and upper ends of the divided reinforcing plates facing each other are connected to each other by a joining plate inserted into the locking groove. That is, by inserting the joining plate into the locking groove at the upper end of the divided reinforcing plates facing each other, the divided reinforcing plates can be extremely easily connected at the upper ends thereof.

According to a fourth aspect of the present invention, there is provided the tunnel reinforcing structure according to the third aspect, wherein the divided reinforcing plates facing each other are arranged in a staggered manner so as to be shifted by about half of the width in the tunnel axial direction. It is characterized by being established. Thereby, when each divided reinforcing plate is installed along the inner peripheral surface of the tunnel wall, the split reinforcing plate to be installed is connected to the split reinforcing plate on the opposite side, the upper end of which is already installed by the joining plate. It becomes possible to connect and support, and it is not necessary to support the divided reinforcing plate at the installation position.

According to a fifth aspect of the present invention, there is provided the tunnel reinforcing structure according to the third or fourth aspect, wherein the divided reinforcing plate is formed of an upper split reinforcing plate and a lower split reinforcing plate which are vertically split. The lower split reinforcing plate has a connecting hole formed at the upper end thereof, and the upper split reinforcing plate is provided with a pin which can be inserted into the connecting hole at the lower end thereof. I have. That is, a pin provided at the lower end of the upper split reinforcing plate is inserted into the connection hole at the upper end of the lower split reinforcing plate installed along the inner peripheral surface of the tunnel wall, and the upper end of the upper split reinforcing plate is inserted. Is joined to the upper end of the upper split reinforcing plate that constitutes the split split plate facing each other by the joining plate, so that the reinforcing plate composed of the upper and lower split reinforcing plates can be very easily formed along the inner peripheral surface of the tunnel wall. Will be installed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a tunnel reinforcing structure according to an embodiment of the present invention. In FIG. 1 to FIG. 3, reference numeral 1 denotes a headrace tunnel (tunnel),
Reference numeral 2 denotes a reinforcing plate made of, for example, a stainless plate or the like, which is used to reinforce the water guiding tunnel 1. The water conduction tunnel 1 has an invert 3 having a gentle arc-shaped bottom surface, and a tunnel wall 4 having a substantially U-shaped (horseshoe-shaped) in cross-section is formed upward from both sides of the invert 3. Have been.

The reinforcement of the water guide tunnel 1 reinforces the inner peripheral surface 4a of the tunnel wall 4 constructed on the upper side of the invert 3, and the reinforcing plate 2 is provided on the upper side of the invert 3. The reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 are installed along the inner peripheral surface 4a of the tunnel wall 4.
The mortar is injected as a backfill material between them and integrated.

The reinforcing plate 2 is composed of a pair of left and right divided reinforcing plates 5.
Are connected to each other at the vertices. In addition, these reinforcing plates 2 are staggered by being displaced by half the width in the axial direction of the water guiding tunnel 1.

The pair of left and right divided reinforcing plates 5
The upper divided reinforcing plate 5a and the lower divided reinforcing plate 5b are connected to each other. Each of the upper and lower divided reinforcing plates 5a and 5b is provided with a joint plate portion 6 rising up to the inner peripheral surface 4a side of the tunnel wall body 4 around the reinforcing plate. Further, these upper and lower divided reinforcing plates 5a,
5b, a rib 7 is provided on the inner peripheral surface 4a side of the tunnel wall 4 at the center in the width direction to be reinforced.

The upper and lower divided reinforcing plates 5a, 5b
Are provided with a plurality of spacing adjusting spacers (spacers) 8 on the outer surface side. These spacing adjusting spacers 8
As shown in FIG. 4, upper and lower divided reinforcing plates 5a,
Nut member 9 fixed to the outer surface side of 5b by welding or the like
And a bolt 10 screwed into the nut member 9 from the outside. The nut member 9 of the bolt 10
By adjusting the screwing amount of the bolts, the protrusion amount of the bolt 10 from the outer surface of the upper and lower divided reinforcing plates 5a, 5b is adjusted.

The distance between the upper and lower divided reinforcing plates 5a and 5b and the inner peripheral surface 4a of the tunnel wall 4 is adjusted by adjusting the amount of protrusion of the bolt 10. The upper and lower split reinforcing plates 5a, 5b
Is formed with a hole 11 through which the tip of the bolt 10 is inserted. After the upper and lower divided reinforcing plates 5a, 5b are installed, the upper and lower divided reinforcing plates 5a, 5a, 5
The tip of the bolt 10 protruding toward the inner surface side of b is cut.

The lower divided reinforcing plate 5b is provided with a support stay 12 at the lower end thereof. This support stay part 1
As shown in FIG. 5, reference numeral 2 denotes a stay 14 having a male screw which can be screwed to a nut 13 fixed to the joint plate 6 of the lower divided reinforcing plate 5b. And the lower divided reinforcing plate 5b
Is supported at the lower end.

Both lower ends of the lower split reinforcing plate 5b, that is, corners on the lower side of the lower split reinforcing plate 5b are connected to lower end joining portions 16 for connecting the lower split reinforcing plates 5b to each other.
It has been. The joining structure at the lower end joining portion 16 will be described with reference to FIGS.

As shown in the figure, a plate 5 constituting the lower split reinforcing plate 5b is formed at a lower side corner of the lower split reinforcing plate 5b.
The corner of b 'is cut out in an L-shape, and an L-shaped plate 17 is fixed to the plate body 5b' along this notch. The cutout portion at the corner is a bolt box 18, and the joint plate 6 is exposed at the bolt box 18. The joint plate portions 6 of the respective lower divided reinforcing plates 5b that are in contact with each other are fastened and fixed in the bolt box 18 by bolts 19 and nuts 20. That is, holes 21 communicating with each other are formed in the joint plate 6 exposed in the bolt box 18, and the bolts 19 are inserted into the holes 21 connected to each other, and the nuts 20 are inserted into the bolts 19. By screwing, the lower divided reinforcing plates 5b are joined to each other at their lower ends.

Further, both side portions at the upper end of the lower divided reinforcing plate 5b, that is, upper corners of the lower divided reinforcing plate 5b are formed as upper end joining portions 22 for joining the lower divided reinforcing plates 5b to each other. . The joining structure at the upper end joining portion 22 will be described with reference to FIG.

As shown in the figure, a plate 5 constituting the lower split reinforcing plate 5b is provided at an upper side corner of the lower split reinforcing plate 5b.
An L-shaped plate member 23 fixed to b ′ is provided,
The portion surrounded by the plate 23 is the bolt box 2
It is set to 4. Then, the joint plate portion 6 of each of the lower divided reinforcing plates 5b abutting on each other is connected to the bolt box 2
4, it is fastened and fixed by bolts 25 and nuts 26.

That is, the joint plates 6 on both sides in the bolt box 24 are formed with holes 27 communicating with each other, and the bolts 25 are inserted into the holes 27 which communicate with each other. By screwing the nut 26, the lower divided reinforcing plates 5b are joined to each other at their upper ends. The upper joint plate 6 constituting the lower split reinforcing plate 5b is notched at its end, so that the upper part of the bolt box 24 is opened. That is, this bolt box 24
Can be performed from above the lower split reinforcing plate 5b.

In FIGS. 1 and 2, reference numeral 31 denotes a connecting portion between the lower divided reinforcing plate 5b and the upper divided reinforcing plate 5a. The structure of the connecting portion 31 will be described with reference to FIG. A connection hole 32 is formed in the upper joint plate portion 6 of the lower split reinforcing plate 5b, and a pin 33 is fixed to the lower joint plate portion 6 of the upper split reinforcing plate 5a. . When connecting the upper split reinforcing plate 5a to the lower split reinforcing plate 5b, the joint plate portion 6 on the upper side of the lower split reinforcing plate 5b is used.
The pin 33 fixed to the joint plate portion 6 on the lower side of the upper split reinforcing plate 5a is inserted into the connection hole 32 formed in the upper portion and engaged with each other. The pin 33 provided on the joint plate 6 below the upper split reinforcing plate 5a is
By inclining the end face, the end face is formed at an acute angle so that it can be easily inserted into the connection hole 32 of the joint plate portion 6 on the upper side of the lower divided reinforcing plate 5b.

The upper and lower divided reinforcing plates 5a and 5b include:
A sheath tube 41 is provided at an intermediate portion in the height direction so as to extend in the width direction. As shown in FIG. 10, brackets 4 each having a substantially U-shaped cross section are provided at both ends of the sheath tube 41.
The brackets 42 are provided with bent portions 42a at both ends thereof, the upper and lower divided reinforcing plates 5a,
5b are fixed to the joint plates 6 on both sides. The joint plate 6 to which the bent portion 42a of the bracket 42 is fixed is
These bent portions 42a are notched, and therefore, when the both side portions of the upper divided reinforcing plate 5a or both side portions of the lower divided reinforcing plate 5b are brought into contact with each other so that the brackets 42 coincide with each other. A space is formed between the brackets 42, and the space is used as a bolt box 43.

A long bolt 44 shown in FIG. 11 is inserted through the sheath tube 41. The long bolt 44 has a threaded portion 45 formed at the front end and a female threaded portion 46 formed at the rear end. The male threaded portion 45 is screwed into the female threaded portion 46 of another long bolt 44. Thus, the long bolts 44 are connected to each other.

When the upper divided reinforcing plates 5a or the lower divided reinforcing plates 5b are joined to each other in the width direction by the long bolts 44, the upper and lower portions already installed along the inner peripheral surface 4a of the tunnel wall 4 are installed. Split reinforcing plates 5a, 5b
On the side of the upper and lower divided reinforcing plate 5a to be installed next,
In a state where one side of 5b is abutted and arranged in the width direction, a long bolt 44 is inserted into the sheath tube 41 from the other side of the upper and lower divided reinforcing plates 5a and 5b to be installed next. The external thread 45 of the long bolt 44 is passed through the sheath tube 41 of the existing upper and lower split reinforcing plates 5a, 5b.
This is performed by screwing into the female screw portion 46.

Next, the joint structure between the upper ends of the upper divided reinforcing plates 5a will be described with reference to FIGS. As shown in the figure, a locking groove 51 is formed at the upper end of the upper split reinforcing plate 5a and opens to the end side across the width direction. The locking groove 51 is welded and fixed to the surface of the substrate 52 which is welded and fixed to the inner peripheral surface 4a side of the tunnel wall 4 of the plate 5a 'constituting the upper split reinforcing plate 5a. The locking plate 53 is formed from the locking plate 53 and is fixed to the substrate 52 by shifting the locking plate 53 toward the end of the plate 5a '. The gap is a locking groove 51. Then, a key plate (joining plate) 54 made of a long plate material is inserted into the locking grooves 51 in a state where the upper divided reinforcing plates 5a are arranged so that the locking grooves 51 face each other. It has become.

The plate 5a 'and the locking plate 53 are formed with holes 55 and 56 penetrating from front to back, and a nut is formed on the surface of the locking plate 53 at a position facing the hole 56. 57
Are fixed by welding. Holes 55 and 56 are formed in the substrate 52.
Is formed, a semicircular concave portion 58 is formed, and the key plate 54 is formed with a semicircular concave portion 59 on a side portion thereof. That is, key plate 5
When the groove 4 is inserted into the locking groove 51, the concave portion 59 of the key plate 54 and the concave portion 58 of the substrate 52 abut against each other to form a hole communicating with the holes 55 and 56. Then, with the recesses 58 and 59 abutting each other, the countersunk screw 60 is inserted from the plate body 5a 'side and screwed into the nut 57 so that the key plate 54 and the plate 5a' 53, and is fixed in the longitudinal direction, and is maintained in a state of being positioned in the longitudinal direction.

In the key plate 54, holes 61 are formed at intervals in the longitudinal direction.
An overflow pipe 62 is welded and fixed to the inner peripheral surface 4a side of the tunnel wall 4 so as to communicate with the tunnel wall 4.

Next, a case where the inner peripheral surface of the water guide tunnel 1 is reinforced by the reinforcing plate 2 having the above structure will be described. (1) Arrangement work of the lower split reinforcing plate 5b The upper split reinforcing plate 5a and the lower split reinforcing plate 5b constituting the reinforcing plate 2 are transported into the water guide tunnel 1, and first, the lower split reinforcing plate 5b is connected to the tunnel wall. 4, and one side of the lower split reinforcing plate 5b is brought into contact with the other side of the lower split reinforcing plate 5b of the reinforcing plate 2 already installed.

(2) Adjustment work of the installation height of the lower divided reinforcing plate 5b The stay 14 of the support stay portion 12 provided at the lower end of the newly installed lower divided reinforcing plate 5b is rotated to make the existing lower divided plate 5b. Match the height with the reinforcing plate 5b. In addition, stay 1
The base 15 with which the base 4 is in contact is formed in a predetermined position on the invert 3 in advance.

(3) Joining work of the lower divided reinforcing plates 5b In this state, the lower joining portion 16 and the upper joining portion 22 at the lower end and the upper end of the lower divided reinforcing plate 5b
The lower divided reinforcing plates 5b are joined together. Here, since the bolt box 18 is opened on the inner side at the lower end joint portion 16, the bolts 19 in the bolt box 18,
The fastening operation using the nut 20 can be easily performed from the inner surface side of the lower divided reinforcing plate 5b. Also, the upper end joint 18
Since the bolt box 24 is opened on the upper side, the fastening operation by the bolt 25 and the nut 26 in the bolt box 24 is performed from above the lower split reinforcing plate 5b.

Further, a newly installed lower divided reinforcing plate 5b
Insert the long bolt 44 from the other side into the sheath tube 41,
The external thread 45 of the distal end of the long bolt 44 is screwed into the female thread 46 of the long bolt 44 fixing the existing lower divided reinforcing plate 5b. Thereby, each long bolt 4
4 are fastened and fixed in a bolt box 43 formed between the lower divided reinforcing plates 5b, and the lower divided reinforcing plates 5b are joined to each other.

(4) Arrangement work of the upper split reinforcing plate 5a The upper split reinforcing plate 5a is connected to the pin 3 provided at the lower end thereof.
3 is connected to the upper portion of the lower split reinforcing plate 5b while being inserted into the connection hole 32 at the upper end of the lower split reinforcing plate 5b, disposed along the inner peripheral surface 4a of the tunnel wall 4, and one side thereof is connected. It is brought into contact with the other side of the already installed upper divided reinforcing plate 5a.

(5) Joining work of the upper divided reinforcing plates 5a In this state, the newly installed upper divided reinforcing plate 5a
Insert the long bolt 44 from the other side into the sheath tube 41,
The external thread 45 of the distal end of the long bolt 44 is screwed into the female thread 46 of the long bolt 44 fixing the existing upper divided reinforcing plate 5a. Thereby, each long bolt 4
4 are fastened and fixed in a bolt box 43 formed between the upper divided reinforcing plates 5a, and the upper divided reinforcing plates 5a are joined to each other.

(6) Joining operation using the key plate 54 The upper split reinforcing plate 5a is installed as described above, and the split reinforcing plate 5 composed of the lower split reinforcing plate 5b and the upper split reinforcing plate 5a is connected to the tunnel wall 4 by the Once installed along the inner peripheral surface 4a,
The split reinforcing plate 5 is staggered in the axial direction of the water guide tunnel 1 to join the split reinforcing plate 5 on the opposite side, which is installed with a half width shift toward the back side in the axial direction of the water guide tunnel, by the key plate 54. I do. That is, the locking groove 51 at the upper end of the upper divided reinforcing plate 5a of the divided reinforcing plate 5 facing each other.
The key plate 54 is inserted into the inside.

Here, the length dimension of the key plate 54 is
Since the width of the divided reinforcing plates 5 is set to half of the width of the divided reinforcing plates 5, and the divided reinforcing plates 5 opposed to each other are staggered by half the width in the tunnel axis direction, the split reinforcing plates 5 are newly installed. The key plate 54 that joins the divided reinforcing plate 5 adjacent to the reinforcing plate 5 to the divided reinforcing plate 5 on the opposite side is inserted into a half of the divided reinforcing plate 5 on the opposite side in the tunnel axial direction. In other words, the key plate 54 is not inserted into a portion of the opposing divided reinforcing plate 5 that faces the newly installed divided reinforcing plate 5. Therefore, when the key plate 54 is newly inserted, this key plate 54 engages with the front half of the split reinforcing plate 5 on the opposite side in the tunnel axial direction, and the key plate 54 in the tunnel axial direction of the split reinforcing plate 5 to be newly installed. It will engage with the back half.

When the concave portion 59 of the key plate 54 is brought into contact with the concave portion 58 of the substrate 52 by inserting the key plate 54 as described above, the hole 55 is formed from the side of the plate 5a 'constituting the upper split reinforcing plate 5a. The countersunk screw 60 is inserted into the hole formed by the recesses 58 and 59 and the hole 56 of the locking plate 53 and screwed into the nut 57 so that the key plate 54 is sandwiched between the plate 5 a ′ and the locking plate 53. Then, it is fixed in a state where it is positioned in the longitudinal direction.

(7) Adjustment of the gap between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 The bolts 10 of the plurality of spacing adjusting spacers 8 provided on the upper and lower divided reinforcing plates 5a, 5b are connected to the inner surface. By rotating the bolts 10 from above, the amount of protrusion of the bolts 10 to the outside is adjusted, and a gap between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 is secured by the space adjusting spacers 8. In addition,
After the adjustment of the interval, the bolts 10 protruding from the inner surfaces of the upper and lower divided reinforcing plates 5a and 5b are cut.

(8) Construction work of the invert 3 'By repeating the above-mentioned works (1) to (7) on the left and right of the water conveyance tunnel 1, when the reinforcing plate 2 having a predetermined distance in the axial direction of the tunnel is installed, The invert 3 of the water conveyance tunnel 1 is so filled as to fill the gap at the lower end of the lower split reinforcing plate 5b.
Concrete is cast on the upper surface and a new invert 3 '(see FIGS. 1 and 3) is constructed. At this time, the lower end connecting portion 16 in which the lower end portions of the lower divided reinforcing plate 5b are connected to each other.
Bolt box 18 is also closed.

(9) Mortar Injection Work When the lower end of the lower divided reinforcing plate 5b is closed by constructing a new invert 3 ', the mortar is inserted into the gap between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4. Inject. As a method of injecting the mortar, it is preferable to first inject the mortar to the substantially upper end position of the lower divided reinforcing plate 5b, and to inject the mortar into the remaining gaps on the upper side after curing of the mortar. May be injected.

When the gap between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 is completely filled with mortar, the overflow pipe 6 provided on the key plate 54 at the upper end is formed.
Mortar overflows from 2. That is, when the mortar overflows from the overflow pipe 62, it can be easily confirmed that the injection of the mortar has been completed. In addition, the bolt box 24 of the upper end joint part 22 which joins the upper ends of the lower divided reinforcing plate 5b, and the upper divided reinforcing plate 5
The bolt box 43 in which the female thread portion 46 of the long bolt 44 connecting the a and the lower divided reinforcing plates 5b to each other in the tunnel axis direction is disposed.
a, 5b, which are closed by the plate members 5a ', 5b' constituting the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall member 4.
Even if mortar is injected into the gap between them, there is no inconvenience that the mortar leaks from these joints.

As described above, by repeating the above operations (1) to (9), the reinforcing plate 2 is integrated with the water guide tunnel 1 along the inner peripheral surface 4a of the tunnel wall 4 by mortar. Reinforcement structures can be provided. In addition, every predetermined section in the axial direction of the water conveyance tunnel 1, (1)-
While installing the reinforcing plate 2 consisting of (7), it is possible to carry out the construction work of the invert 3 'of (8) behind it and further carry out the mortar injection work of (9) behind it. it can. That is, by performing these operations at the same time, the efficiency of the construction operation is greatly improved, and the construction period can be shortened.

According to the tunnel reinforcing structure described above, the space between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 is ensured by the space adjusting spacer 8 provided on the reinforcing plate 2. When the mortar is injected into the gap, the disadvantage that the gap is partially widened or narrowed by the injection pressure of the mortar can be eliminated.
Therefore, the reinforcing plate 2 can be surely integrated with the inner peripheral surface 4a of the tunnel wall 4 with a uniform joining force by the mortar, and a favorable reinforcing structure can be secured.

Further, the gap between the reinforcing plate 2 and the inner peripheral surface 4a of the tunnel wall 4 is extremely easily formed by rotating the bolt 10 constituting the space adjusting spacer 8 and moving the bolt 10 forward and backward. Can be adjusted.

Further, by inserting the key plate 54 into the locking groove 51 at the upper end of the upper divided reinforcing plate 5a constituting the divided reinforcing plate 5 facing each other, the divided reinforcing plates 5 can be extremely easily connected to each other. Can be connected at the
Thereby, the labor of connecting these divided reinforcing plates 5 can be greatly reduced, and the construction period can be shortened.

Furthermore, since the divided reinforcing plates 5 are arranged in a staggered manner in the tunnel axis direction, when each of the divided reinforcing plates 5 is installed along the inner peripheral surface 4a of the tunnel wall 4, The divided reinforcing plate 5 to be installed can be supported by connecting the upper end portion thereof to the already installed divided reinforcing plate 5 by the key plate 54. Therefore, when the divided reinforcing plate 5 is installed along the inner peripheral surface 4a of the tunnel wall 4, a support for supporting the divided reinforcing plate 5 at the installation position can be unnecessary, and the supporting work by the supporting and The work of assembling and removing the shoring can be eliminated, and the construction period can be further shortened.

Also, a pin 33 provided at the lower end of the upper split reinforcing plate 5a is inserted into the connection hole 32 at the upper end of the lower split reinforcing plate 5b installed along the inner peripheral surface 4a of the tunnel wall 4. By joining the upper end portion of the upper split reinforcing plate 5a to the upper end portion of the upper split reinforcing plate 5a constituting the opposing split reinforcing plate 5 by the key plate 54, the upper and lower split reinforcing plates 5a are extremely easily connected. The divided reinforcing plate 5 made of 5b can be installed along the inner peripheral surface 4a of the tunnel wall 4.

In the above example, a stainless steel plate having excellent corrosion resistance was used as the reinforcing plate 2, but the material of the reinforcing plate 2 is not limited to stainless steel.

[0049]

As described above, according to the structure for reinforcing a tunnel of the present invention, the following effects can be obtained. According to the reinforcing structure of the tunnel according to the first aspect, the spacer provided on the reinforcing plate secures the space between the reinforcing plate and the inner peripheral surface of the tunnel wall, and thereby the backfill material is injected into this gap. At this time, the inconvenience that the gap is partially widened or narrowed due to the injection pressure of the backfill material is eliminated, and therefore, the reinforcing plate is attached to the inner peripheral surface of the tunnel wall with uniform bonding force by the backfill material. It is possible to reliably integrate them, and it is possible to secure a favorable reinforcing structure.

According to the second aspect of the present invention, the gap between the reinforcing plate and the inner peripheral surface of the tunnel wall can be adjusted very easily by moving the spacer forward and backward. According to the reinforcing structure of the tunnel according to claim 3,
By inserting the joining plate into the locking groove at the upper end of the divided reinforcing plates facing each other, the divided reinforcing plates can be extremely easily
The connection can be made at the upper end, whereby the labor for connecting the divided reinforcing plates can be greatly reduced, and the construction period can be shortened.

According to the reinforcing structure of the tunnel according to the fourth aspect, since the divided reinforcing plates are arranged in a staggered manner in the axial direction of the tunnel, each divided reinforcing plate is arranged along the inner peripheral surface of the tunnel wall. When installing, the split reinforcement plate to be installed,
The upper end can be connected to and supported by the split reinforcing plate on the opposite side already installed by the joining plate. Thus, when installing the split reinforcing plate along the inner peripheral surface of the tunnel wall, it is possible to eliminate the need for a support for supporting the split reinforcing plate at the installation position. Assembly and removal work can be eliminated, and the construction period can be further reduced.

According to the reinforcing structure of the tunnel according to the fifth aspect, the connecting hole at the upper end of the lower split reinforcing plate installed along the inner peripheral surface of the tunnel wall is provided at the lower end of the upper split reinforcing plate. By inserting a pin and joining the upper end portion of the upper split reinforcing plate to the upper end portion of the upper split reinforcing plate that constitutes the split reinforcing plate opposed by the joining plate, the upper and lower split reinforcing plates can be very easily removed. The divided reinforcing plate can be installed along the inner peripheral surface of the tunnel wall.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a water conduction tunnel provided with a reinforcing structure for explaining a tunnel reinforcing structure according to an embodiment of the present invention.

FIG. 2 is a side cross-sectional view of a water conveyance tunnel provided with a reinforcing structure for explaining a tunnel reinforcing structure according to an embodiment of the present invention.

FIG. 3 is a plan view of the vicinity of an upper end of a reinforcing plate used in the tunnel reinforcing structure according to the embodiment of the present invention.

FIG. 4 is a side view of the spacing adjusting spacer for explaining the configuration and structure of the spacing adjusting spacer provided on the reinforcing plate used in the tunnel reinforcing structure according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a support portion at a lower end of the reinforcing plate for explaining a configuration and a structure of a support stay provided at a lower end of the reinforcing plate used in the tunnel reinforcing structure according to the embodiment of the present invention. .

FIG. 6 is a front view of a lower end joining portion for explaining a joining structure at a lower end portion of the lower split reinforcing plate used in the tunnel reinforcing structure according to the embodiment of the present invention.

FIG. 7 is a side view of a lower end portion of the lower split reinforcing plate for explaining a joining structure at a lower end portion of the lower split reinforcing plate used in the tunnel reinforcing structure according to the embodiment of the present invention.

FIG. 8 is a front view of the vicinity of an upper end joint for explaining a joint structure at an upper end of a lower split reinforcing plate used in a tunnel reinforcing structure according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view of a connecting portion for explaining a connecting structure of upper and lower divided reinforcing plates used in a tunnel reinforcing structure according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view of a connecting portion for explaining a connecting structure for connecting upper divided reinforcing plates and lower divided reinforcing plates in a tunnel axial direction used in the tunnel reinforcing structure according to the embodiment of the present invention.

FIG. 11 is a side view of a long bolt for explaining a long bolt used in the tunnel reinforcing structure according to the embodiment of the present invention, which connects upper divided reinforcing plates and lower divided reinforcing plates in a tunnel axial direction.

FIG. 12 is a cross-sectional view of a connecting portion for explaining a connecting structure at an upper end portion of an upper split reinforcing plate used for a reinforcing structure of a tunnel according to an embodiment of the present invention.

FIG. 13 is a plan view of a connection portion for explaining a connection structure at an upper end portion of an upper split reinforcing plate used for a tunnel reinforcement structure according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water guide tunnel (tunnel) 2 reinforcing plate 3 invert (bottom surface) 4 tunnel wall 4 a inner peripheral surface 5 split reinforcing plate 5 a upper split reinforcing plate 5 b lower split reinforcing plate 8 spacing adjusting spacer (spacer) 32 connecting hole 33 pin 51 Stop groove 54 Key plate (joining plate)

Claims (5)

[Claims] 1. A tunnel in which a substantially U-shaped tunnel wall is constructed from both sides of a bottom surface, a reinforcing plate is installed along an inner peripheral surface of the tunnel wall, and the reinforcing plate and the inside of the tunnel wall are provided. A tunnel reinforcement structure in which a backfill material is injected into a peripheral surface to integrate and reinforce the reinforcing plate on an inner peripheral surface of the tunnel wall body. A plurality of spacers are provided to protrude and abut against the inner peripheral surface side to secure a gap with the inner peripheral surface of the tunnel wall body against the injection pressure of the backfill material injected into the gap. Characteristic tunnel reinforcement structure. 2. The tunnel reinforcing structure according to claim 1, wherein the spacer is capable of moving forward and backward in a protruding direction thereof. 3. The reinforcing plate is composed of divided reinforcing plates divided into a plurality in the axial direction of the tunnel and divided from the center in the width direction of the tunnel, and upper ends of the divided reinforcing plates are connected at the top of the tunnel. At the upper end of the divided reinforcing plate, a locking groove is formed extending in the longitudinal direction, and the upper ends of the divided reinforcing plates facing each other are joined to each other by the joining plate inserted into the locking groove. The tunnel reinforcement structure according to claim 1 or 2, wherein the structure is connected. 4. The reinforcing structure for a tunnel according to claim 3, wherein the divided reinforcing plates facing each other are arranged in a staggered manner, being shifted by about half of the width in the tunnel axial direction. 5. The split reinforcing plate is composed of an upper split reinforcing plate and a lower split reinforcing plate which are split vertically, and the lower split reinforcing plate has a connection hole formed at an upper end thereof,
The tunnel reinforcing structure according to claim 3 or 4, wherein a pin that can be inserted into the connection hole is provided at a lower end of the upper split reinforcing plate.