JP3350165B2 - Tunnel reinforcement structure and tunnel reinforcement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power cable, the gap between the inner surface of the tunnel housing of such a communication cable is accommodated inside and the stored item may be provided without movement of the stored items tunnels Reinforcement structure and tunnel supplement
Regarding the strong method .

[0002]

2. Description of the Related Art In-use tunnels (having rectangular or circular cross-sections) such as cavities where power cables are stored, cavities where communication cables are stored, and communal trenches are deteriorated. Conventionally, in the case of carrying out inner winding reinforcement work, cast-in-place concrete, precast concrete slab, H-shaped steel, L-shaped steel, and the like are used as reinforcing members. Generally, in the reinforcing member, due to the thickness of the reinforcing member itself,
It cannot be installed in the narrow gap between the existing cable and the inner wall surface of the tunnel. In many cases, the cable is moved to secure the installation area and the work area of the reinforcing member, and then the reinforcing work is often performed.

[0003]

However, when the cables are moved as described above, if a large number of cables are stored, the cable moving costs are almost equal to the reinforcing work costs, and the cost is greatly increased. There is also a problem that power transmission must be stopped when moving, and the time is affected depending on the power or communication demand.

[0004] Here, a more detailed description will be given, taking as an example the case of repairing a cave as shown in FIG. The cave to be reinforced is composed of a top plate 2 and a bottom plate 3 along the horizontal direction, and both side plates 4 and 4 along the vertical direction. Box culvert 5 with two pillars 6 in the center
8 and one of the rooms 7
Precast concrete slab 9 has already been used to reinforce the inner winding. The other room 8 has an inner wall surface 4
A vertical metal (L-shaped steel having a size of 75 mm × 75 mm × thickness of 6 mm) 10 extends in the depth direction of the box culvert 5 along a.
A stand 11 is attached to the stand 10 at a predetermined height so as to protrude horizontally inward. A high-pressure cable 12 with a trough is mounted on the stand 11. A high-voltage cable 13 without a trough is mounted and supported. Here, the cross-sectional force generated in the reinforcing structure is modeled as an overlay of the existing box culvert and the newly installed reinforcing structure, and the load such as earth pressure and water pressure acting on the outer surface of the existing box culvert is applied to the existing box culvert. It is determined by reproducing the situation transmitted to the newly installed reinforcing structure via the culvert. In modeling the existing box culvert, a portion where the generated sectional force exceeds the member strength was modeled as a hinge. In addition, since the existing box culvert and the newly installed reinforcing structure are modeled as an overlapped version, the load transmission from the existing box culvert to the newly installed reinforcing structure is not affected by the existing box culvert and the newly installed reinforcing structure. The model is modeled so that the compressive force is transmitted only to the part where displacement occurs in the direction approaching. Thus, a bending moment having a distribution as shown in FIG. 13, an axial force having a distribution as shown in FIG. 14, and a shearing force having a distribution as shown in FIG. In these figures, the outer line indicates the axis of the existing box culvert, and the inner line indicates the axis of the newly installed reinforcing structure.)
For example, the bending moment is 4.2 ton-m per unit length at the position indicated by A in FIG. 13 and 2.3 ton-m per unit length at the position indicated by B, and the axial force is C in FIG. At the position shown, 20.2 tons per unit length is applied. At the position shown at D, 18.1 tons per unit length is applied. The shear force is 3.1 ton per unit length at the position shown at E in FIG. A maximum of 18.3 tons per unit length will be applied to the part 2 and the bottom plate part 3. Then, the reinforcing structure is carried in the state of the divided reinforcing members, and is assembled in a substantially U-shape so as to be in contact with the inner surface of the box culvert 5 at the site. here,
The positions indicated by F to I in FIG. 13 are positions where the bending moment is small and the joints of the respective reinforcing members are possible, and joints cannot be provided at other positions structurally. Thereby, for example, the inner vertical dimension 2990 of the box culvert 5 is provided on the inner wall surface 4a of the side plate portion 4.
An undivided reinforcing member having a length of about 2000 mm, which is not shorter than mm, is required. In the case of this example, 100 to 100 are attached to the top plate portion 2 and the bottom plate portion 3 to insert the reinforcing member.
Although a gap of about 200 mm can be ensured, there is only a gap of about 75 mm corresponding to the height of the metal fitting 10 between the cables 12 and 13 and the inner wall surface 4a, and a reinforcing member is provided in such a gap. Requires the cables 12 and 13 to be moved.

Accordingly, an object of the present invention is to provide a reinforcing structure for a tunnel which can be installed in a gap between the stored article and the inner wall surface of the tunnel without moving the stored article, and
It is to provide a method of reinforcing a tunnel .

[0006]

In order to achieve the above object, a reinforcing structure for a tunnel according to the present invention is provided in a gap between an inner surface of a tunnel in which stored items are stored and the stored items. A plurality of flexible thin steel materials that can be inserted into the gap, and
Are laminated along the depth direction on the inner surface of the
And a reinforcing member formed by being restrained
It is characterized by: The restraining means includes a restraining structure
Are used, and a plurality of thin
By arranging one set in a target shape centering on steel
It is characterized by being restrained. Or the restraint
In the means, an adhesive is used to form the reinforcing member.
Multiple thin steel materials completely connect adjacent
It is characterized by being worn and restrained. Also t
The reinforcing structure of the tunnel is a tunnel
Steel material provided in the gap between the inner surface of the
The thickness direction of the tunnel along the depth direction on the inner surface of the tunnel.
It is constructed by stacking several times,
The reinforcement structure is divided into multiple parts in the circumferential direction of the tunnel,
At least one has a plurality of flexible thin steel materials,
Make the thickness direction along the depth direction on the inner surface of the tunnel
Formed by being stacked and restrained using restraining means
The joint part of the reinforcing member
Are engaged with each other, and
It is characterized by being. In addition, how to reinforce the tunnel
The law is provided on the inner surface of the tunnel where the items are stored.
A method for reinforcing a tunnel, comprising:
Insert a thin steel material into the gap with the inner surface while bending it.
The first to make the thickness direction along the depth direction on the inner surface of the tunnel
Step and the first step are repeated a predetermined number of times to form a thin steel material.
Multiple thickness directions along the depth of the inner surface of the tunnel
A second step of laminating and restraining to form a reinforcing member;
The third step of fixing the strong members to the inner surface of the tunnel
It is characterized by that.

[0007]

According to the present invention, a plurality of thin steel materials can be inserted into the gap between the inner surface of the tunnel and the storage items while bending them, and these steel materials can be bundled to form a reinforcing member. And a reinforcing structure having a reinforcing member can be provided.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a reinforcing member of a tunnel according to an embodiment of the present invention. The same parts as in the prior art are denoted by the same reference numerals, and description thereof is omitted. The reference numeral 15 in the drawing denotes a substantially U-shaped reinforcing structure that is aligned with the inner surface of the box culvert 5. A plurality of circumferentially divided reinforcing members 16 to provided in a state along the depth direction, respectively.
20. That is, the reinforcing structure 15 is
Top plate reinforcing member 1 along top plate portion 2 of box culvert 5
6, a top plate corner reinforcement that bends along the top plate portion 2 and bends further along the slope of the boundary between the top plate portion 2 and the side plate portion 4 to extend to a predetermined position above the side plate portion 4 Member 17,
A side plate reinforcing member 18 along the side plate portion 4 and a predetermined position below the side plate portion 4 by bending along the bottom plate portion 3 and further bending along an oblique portion between the bottom plate portion 3 and the side plate portion 4 It is divided into a bottom slab corner reinforcing member 19 extending to the bottom and a bottom slab reinforcing member 20 along the bottom slab portion 3.

All of these reinforcing members 16 to 20 have the same thickness (for example, 15 mm).
One end of the top plate corner reinforcing member 17 is in contact with one end of the top plate corner reinforcing member 17, and the other end of the top plate corner reinforcing member 17 is in contact with one end of the side plate reinforcing member 18. The other end of the bottom plate corner reinforcing member 19 is in contact with one end of the bottom plate corner reinforcing member 19, and the other end of the bottom plate corner reinforcing member 19 and one end of the bottom plate reinforcing member 20 are in contact with each other. Further, if necessary, a reinforcing structure 15 is formed by superposing a plurality of cavities along the depth of the cave 5, that is, the box culvert 5.

Here, the top plate corner reinforcing member 17 and the bottom plate corner reinforcing member 19 are arranged such that long and short portions along the side plate portion 4 are alternately arranged, and have the same length. The side plate reinforcing members 18 are arranged with their positions alternately offset vertically. Thereby, the top plate corner reinforcing member 17 and the side plate reinforcing member 1
8 and the joint between the side plate reinforcing member 18 and the bottom plate corner reinforcing member 19 shown in FIGS. 5 and 6 are joined in a mutually meshed state, and the joining strength is further improved. You.

Reference numeral 22 in the figure denotes reinforcing members 16-2.
0 shows a restraining structure for maintaining 0 in the shape of the reinforcing structure 15 and attaching the reinforcing structure 15 to the inner surface of the box culvert 5. This restraining structure 22
Is constituted by a plurality of divided restraining members 23 to 29 obtained by dividing and joining an L-shaped steel material substantially constituted by two orthogonal surface portions as required (however, as shown in the right side of FIG. 4). By using a steel material having a concave cross section, it is also possible to double as a standing metal). That is, the constraint structure 2
2 is a top plate restraining member 23 along the top plate portion 2 of the box culvert 5, and a top plate portion 2 that is bent along the top plate portion 2 while being bent.
Top plate corner restraint member 24 along the oblique portion of the boundary between the side plate portion 4 and the first side plate restraint member 25, the second side plate restraint member 26, and the third side plate restraint member 27 along the side plate portion 4. The bottom plate 3 is divided into a bottom plate corner restraining member 28 that bends along the bottom plate portion 3 and bends along the slope of the boundary between the bottom plate portion 3 and the side plate portion 4, and a bottom plate restraining member 29 along the bottom plate portion 3.

All of these restraining members 23 to 29 are joined to the reinforcing structure 15 with one surface portion being orthogonal to the sinus passage, that is, the depth direction of the box culvert 5, and the other surface portion is attached to the inner surface of the box culvert 5. It is designed to be joined. In addition, in FIG.
Although only the constraining structure 22 joined to one side of FIG. 1 is shown, one set having a symmetrical shape with the reinforcing structure 15 as the center is further provided (see FIG. 2 and the like).

The reinforcing structure 15 and the restraining structure 22 are provided with joint bolt holes 15a and 22a at predetermined positions along a sinus passage, that is, in the depth direction of the box culvert 5. Joint bolts 31 (FIG. 5) are inserted into joint bolt holes 15a and 22a.
And FIG. 6) are fastened by the insertion nut 32, so that the reinforcing members 16 to 20 in the overlapped state are connected to each other. In addition, the reinforcing structure 15 and the restraining structure 22 are provided with restraining bolt holes 15b and 22b through which restraining bolts (not shown) are inserted at predetermined positions, respectively. The reinforcing structure 15 in the connected state is restrained to a predetermined shape that fits the inner surface of the box culvert 5 by inserting the restraining bolt and fastening with the nut. Note that the top plate reinforcing member 16 and the top plate corner reinforcing member 17 are
4, the top plate corner reinforcing member 17 and the side plate reinforcing member 18 are connected by the first side plate restraining member 25, and the side plate reinforcing member 18 and the bottom plate corner reinforcing member 19 are connected to the third side plate restraining member 27. The restricting members 23 to 29 are set to have respective dimensions and shapes such that the bottom plate corner reinforcing members 19 and 20 are connected by the bottom plate corner restricting members 28.

Here, the portion along the inner wall surface 4a of the side plate portion 4 is divided into three parts, a first side plate restraining member 25, a second side plate restraining member 26, and a third side plate restraining member 27. Is
This is for keeping the length of the divided portions so that the length can be inserted into the gap between the inner wall surface 4a of the side plate portion 4 of the box culvert 5 and the cables 12 and 13, which are storage items. Is done.

Further, in the restraining members 23 to 29, anchor bolt holes 22c into which anchor bolts (not shown) for connecting the restraining structure 22 constituted by these components to the inner surface of the box culvert 5 with chemical anchors or the like are inserted. Are provided at predetermined plural positions.

Reinforcing members 16 to 20 and restraining members 23 to 2
No. 9 is made of stainless steel such as SUS304 in order to improve the durability, but when applied to a place where the corrosive environment is not severe, the iron (SS) is used as usual.
Material, SM material, etc.).

In this embodiment, the side plate reinforcing member 18 is used.
However, a plurality of thin plate-like steel members 33 having flexibility are stacked and bundled along the same direction with the thickness direction thereof extending along the depth of the box culvert 5. That is, when one side plate reinforcing member 18 has a thickness of 15 mm as described above, the side plate reinforcing member 18 is configured by bundling five steel materials 33 having a thickness of, for example, 3 mm. This steel 3
The thickness of the steel plate 3 and the like can be curved so that the steel member 33 does not have a habit when the steel plate 33 is inserted into the gap between the inner wall surface 4a of the side plate portion 4 and the cables 12 and 13 that are stored. In other words, it is set so as to be able to cope with a bending radius that can be secured in the construction in the tunnel.
The reinforcing members 16 to 20 each have a thickness of 15 mm.
Are stacked in the depth direction of the cave 5, that is, the box culvert 5, so that the side plate reinforcing member 18 is 3 mm × 5 sheets ×
Ten sheets have a width of 150 mm.

It is also possible to completely bond the steel members 33 adjacent to each other, and by bonding in this way, the side plate reinforcing member 18 can be regarded as one solid member. Since the buckling resistance in the out-of-plane direction with respect to the axial compressive force can be secured, it is not necessary to provide the restraining structure 22 for restraining in the out-of-plane direction as described above. Here, for example, according to the site conditions at the installation location, when the anchor cannot be removed from the existing wall, the bonding may be performed, and when the anchor can be removed, the bonding may not be performed.
In this way, the thickness direction is defined as a sinus
Along the depth of Bart 5 along the same direction
The superimposed steel material 33 is used for bonding or the restraining structure 22 or the like.
The side plate reinforcing member 1 is restrained by using the restraining means.
8.

The reinforcing structures 15 are installed at a constant pitch, for example, similarly to a mountain trough of a tunnel. In this case, the reinforcing structures 15 are arranged at a pitch of 500 mm. Here, the mechanism by which an external load such as earth pressure and water pressure is transmitted to the reinforcing structure 15 is as shown in FIG. 7 (the upper side of FIG. 7 shows the load). Here, assuming that the wall thickness of the box culvert 5 is h and the width of the reinforcing structure 15 is b, the reinforcing structure 15
Is set to b + 2h or less, and the stress dispersion angle θ is 45 °. In FIG. 7, what is indicated by 35 is a compression zone, what is indicated by 36 is a stressless zone, and what is indicated by an arrow in the compression zone 35 is the flow of compressive stress.

Regarding the method of applying the reinforcing structure 15,
This will be described in order with reference to FIGS. First, after the cables 12 and 13 are subjected to protection processing for damage prevention, as shown in FIG. 8, from the bottom plate portion 3 of the box culvert 5 to the lower portion of the side plate portion 4, the bottom plate reinforcing members 20 and the bottom plate corner reinforcing members 19 are provided. Attach. At this time, as described above, the bottom plate corner reinforcing members 19 are attached in such a manner that a short portion and a long portion along the side plate portion 4 alternate in the depth direction of the cave, that is, the box culvert 5. Can be

Next, after assembling the scaffold 37 as required,
The steel material 33 is inserted from the upper side between the cables 12 and 13 and the inner wall surface 4a while being bent while the steel material 33 is bent in a direction in which the surface side faces the inner wall surface 4a, that is, in a bendable direction. The bending is substantially released by the restoring force, and the plane direction, that is, the thickness direction is rotated by about 90 degrees so as to be along the depth direction of the box culvert 5. And
In this way, the steel members 33 are sequentially inserted and rotated to form a plurality of side plate reinforcing members 18, and the side plate reinforcing members 18 are sequentially formed into the irregularities in the bottom plate corner reinforcing members 19.
A predetermined number on

A predetermined number of top plate corner reinforcing members 17 and top plate reinforcing members 16 are attached in a predetermined number from the top plate portion 2 of the box culvert 5 to the upper portion of the side plate portion 4, and attached to the top plate reinforcing member 16 and the bottom plate reinforcing member 20. Attach a bracket 38 for fixing the support 6 to the upright on the other side.
Here, since the upper end position of the side plate reinforcing member 18 is formed with irregularities alternately, the top plate corner reinforcing member 17 corresponding thereto is attached.

When the reinforcing structure 15 is fixed to the box culvert 5 by the above-described restraining structure 22,
For example, the reinforcement structure 15 is provided, and the constraint structures 22 are provided on both sides.
Are provided while connecting these with the joint bolts 31, and then attached by a procedure such as fixing the constraint structure 22 to the box culvert 5. In addition, as shown in FIG. 4, it is also possible to fill the space between the side plate reinforcing member 18 and the inner wall surface 4a with an epoxy resin 39.

As described above, according to the present embodiment,
In order to insert a plurality of thin steel members 33 while bending them into a narrow gap between the inner surface of the cave, that is, the inner surface of the box culvert 5 and the cables 12, 13, and to bundle these steel members 33 to form the side plate reinforcing member 18, a cable The long side plate reinforcing member 18 can be attached without moving the members 12 and 13. As a result, cable moving costs are not required, and costs can be significantly reduced. In addition, since it is not necessary to stop power transmission when moving, the timing is not affected by power or communication demand, and the construction period is shortened. be able to. In addition, since the steel member 33 extends in the thickness direction along the depth direction of the sinus passage, that is, the box culvert 5, and is overlapped in the same direction, the steel member 33 can be a member having a relatively high sectional height, and can be used as a reinforcing member. Strength can be secured.

The reinforcing structure 15 and the restraining structure 2
Since a stainless steel material is used for 2, the durability such as corrosion resistance is improved, and the need for replacement after installation hardly occurs. Furthermore, the long side plate reinforcing member 18 is
Since the components 3 are bundled and configured on site, the weight of each component is reduced, and the workability during transport installation is improved.
In addition, the side plate reinforcing member 18 and the top plate corner reinforcing member 17
And the joint portion between the side plate reinforcing member 18 and the bottom plate corner reinforcing member 19 are joined in a state of being engaged with each other as described above,
The joint strength can be improved, such as resistance to bending moment.

In this embodiment, the side plate reinforcing member 18 is constituted by a plurality of steel materials 33 in view of the installation structure. However, if necessary, the top plate reinforcing member 16 may be used.
Alternatively, other members such as the bottom plate reinforcing member 20 can be made of a plurality of thin steel materials, and in this case, the thickness and the like are set so as to correspond to a bending radius required for construction. .

[0027]

According to the present invention, a plurality of thin steel materials are inserted into the gap between the inner surface of the tunnel and the stored items while bending the thin steel materials, and the steel members are bundled to form a reinforcing member. Therefore, it is possible to provide the reinforcing member without moving the stored items. it can. Therefore, it is possible to reduce the time and labor for moving the stored items.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a reinforcing structure including a reinforcing member of a tunnel and a restraining structure according to an embodiment of the present invention.

FIG. 2 is a front view showing an installed state of a reinforcing structure including a reinforcing member of a tunnel and a restraining structure according to an embodiment of the present invention.

FIG. 3 is a side view showing an installed state of a reinforcing structure including a reinforcing member of a tunnel and a restraining structure according to an embodiment of the present invention.

FIG. 4 is a plan view showing an installation state of a reinforcing structure including a reinforcing member of a tunnel and a restraining structure according to an embodiment of the present invention.

FIG. 5 is a partially enlarged front view illustrating a joint portion of a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 6 is a partially enlarged side view showing a joint portion of a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 7 is a plan view showing a state of stress applied to a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 8 is a front view showing a first step of installing a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 9 is a front view showing a second step of installing a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 10 is a front view showing a third step of installing a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 11 is a front view showing a fourth step of installing a reinforcing structure including a reinforcing member of a tunnel according to an embodiment of the present invention.

FIG. 12 is a front view showing an example of a conventional tunnel.

FIG. 13 is a distribution diagram showing a bending moment generated in a newly installed reinforcing structure.

FIG. 14 is a distribution diagram showing an axial force generated in a newly installed reinforcing structure.

FIG. 15 is a distribution diagram showing a shear force generated in a newly installed reinforcing structure.

[Explanation of symbols]

 5 Box culvert (tunnel) 12, 13 Cable (storage) 18 Side plate reinforcement member 33 Steel material

Continuing on the front page (72) Inventor Masao Hayashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shin Shin 2-3 2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Koji Maehama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Mitsuo Saito 2-6-121, Yaesu, Chuo-ku, Tokyo Ishikawajima Building Materials Industry Co., Ltd. (72) Inventor Soichiro Nakayama 2-6-121, Yaesu, Chuo-ku, Tokyo Ishikawashima Building Materials Industry Co., Ltd. (56) References Jihei Hira 1-177334 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 11/04-11/15

Claims (5)

(57) [Claims] 1. A reinforcing structure for a tunnel provided in a gap between an inner surface of a tunnel in which a storage item is stored and the storage item, wherein a plurality of flexible thin steel materials that can be inserted into the gap are provided. The thickness direction in the depth direction on the inner surface of the tunnel
Laminated along and restrained using restraint means
Characterized by comprising a reinforcing member formed by
Flannel reinforcement structure. 2. A reinforcing structure for a tunnel according to claim 1.
In the restraining means, a restraining structure is used,
The target shape is centered on multiple thin steel materials forming the reinforcing member.
It is characterized by being restricted by being arranged in one set
Tunnel reinforcement structure. 3. The tunnel reinforcing structure according to claim 1,
In this case, an adhesive is used for the restraining means, and the reinforcing portion is used.
The multiple thin steel materials that make up the
Tunnel characterized by being adhered and restrained in a plane
Reinforcement structure. 4. Inside a tunnel in which stored items are stored.
The steel material provided in the gap between the surface and the
Multiple layers stacked in the depth direction on the inner surface of the tunnel
The tunnel reinforcement structure constructed by
The reinforcing structure is divided into a plurality in the circumferential direction of the tunnel.
At least one of which has a plurality of flexible thin steel materials.
The thickness direction along the depth of the inner surface of the tunnel.
Layered and restrained using restraining means.
The joints of the reinforcing members are engaged with each other
Characterized in that the ton is restrained through a restraining means.
Flannel reinforcement structure. 5. A tunnel in which stored items are stored.
A method for reinforcing a tunnel provided on a surface, wherein
Insert a thin steel material into the gap with the inner surface of the tunnel while bending it
Along the depth direction on the inner surface of the tunnel.
And repeating the first step and the first step a predetermined number of times.
Along the depth direction of the inner surface of the tunnel
Second step of stacking and restraining a plurality of members to form a reinforcing member
And a third step for fixing the reinforcing member to the inner surface of the tunnel.
A method for reinforcing a tunnel, the method comprising: