JP3044118B2 - segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment forming a lining for holding an excavated surface in shield work or the like.

[0002]

2. Description of the Related Art The shield method is a method of making a tunnel in soft ground, using a tubular iron plate called a shield, excavating the ground in front while preventing the ground from collapsing, and in a cylinder called a tail plate in the rear, Segments formed of reinforced concrete preliminarily divided and assembled are fastened to assemble into a ring, and this ring is fastened to a preceding ring to form a lining supporting the ground.

Then, a jack is applied to the ring formed by assembling the segments, and the shield is advanced, and the above operation is repeated to penetrate the tunnel.
Further, in the construction of a shaft, a similar lining is formed vertically below.

[0004] Segments are joined by applying the segments to a digging surface and fastening them to adjacent segments usually using bolts. Furthermore, after penetrating a tunnel or the like, reinforced concrete is wound up inside the lining body constituted by the segments, and secondary lining is performed to complete the tunnel and the like.

[0005]

In the above-mentioned conventional method, the segments are installed at predetermined positions (circular), and then bolts are fastened between the segments.

[0006] The assembly of the segments requires some space between the segments.
It will remain after the bolts are fastened. For this reason,
There is some looseness between the segments, the bending strength between the segments decreases, and the bending deformation increases, the gap between the joining surfaces of the segments increases, and the watertightness decreases.

[0007] As described above, if there is looseness between the segments and the bending rigidity is low, after the formation of the primary lining body by the segments, the reinforced concrete lining is placed inside the primary lining body. When the secondary lining is applied, the primary lining cannot reinforce the secondary lining.

[0008] That is, the lining body of the primary lining cannot exhibit large rigidity unless it is deformed until the loosening is eliminated. Therefore, it is the secondary lining body that has no looseness that can withstand the load that gradually increases over time, such as soft ground, from the initial stage. The body cannot resist in conjunction with the primary lining.

In addition, in a tunnel below the surface of groundwater, near the outer surface of the segment for waterproofing, a water-absorbing expandable rubber surrounding the segment in a headband shape is also provided with a sufficient water-impermeability due to the opening of the joint surface of the segment. Is not achieved.

A gap is easily formed in a portion where the corners of the preceding two segments and the corner of the following two segments gather, and it is difficult to maintain watertightness. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to transmit large compressive force between segments, increase bending strength between segments, and improve water tightness. Subject.

[0012]

According to a first aspect of the present invention, in a segment 1 which can be formed into a ring by connecting a large number of segments, one of a circumferential joining surface 2 of the segments 1 which is orthogonal to a circumferential direction of the ring. In the center of the circumferential joining surface 2, there is provided a filler filling recess 3 to which the filler filling hole 7 and the air vent hole 8 are connected, and an annular packing 19 is provided on the peripheral edge of the one circumferential joining surface 2. The one circumferential joining surface 2 is fastened by being brought into contact with the other circumferential joining surface 2 of the other segment 1, and a filler material that is hardened after injection is injected into the recess 3, and The segments were formed so that a compressive force could be transmitted between the segments 1 and 1 that were in contact with each other.

According to a second aspect, in the first aspect, the axial joining surface 2 of the segment 1 is perpendicular to the axial direction of the ring.
3, an elastic sealing material 28 is provided on a peripheral portion of one axial joining surface 23, and one side of the elastic sealing material 28
One side of the annular packing 19 provided on the circumferential joining surface 2 is connected, and the connecting portion 2 that covers one corner of the circumferential joining surface 2 of the segment 1 and one corner 24 where the one axial joining surface 23 contacts.
9 were formed into segments.

[0014]

According to a first aspect of the present invention, a concave portion 3 is provided in a circumferential joining surface 2 orthogonal to a circumferential direction of a ring of a segment 1.
One circumferential joining surface 2 is connected to the concave portion 3 of the other segment 1.
Is brought into contact with the other circumferential joining surface 2 not provided with and is fastened with a fastening material.

When a filler such as a cement solution is injected into the recess 3 through the filler injection hole 7, the internal air is discharged from the air vent 8. When the injected filler hardens, the space between the circumferential joining surfaces 2 of the segments 1 1
Filled with the hardened filler material, a large compressive force can be transmitted between the segments 1.1, and the bending strength between the segments 1.1 is also increased, so that there is little bending deformation between the segments 1.1.

The second aspect of the present invention further relates to a method of forming the corners 24, 24 of the two segments 1.1 of the preceding ring and the corners 24, 24 of the two segments 1.1 of the following ring. The gathering portion is closed by a connecting portion 29 connecting one side of the annular packing 19 and one side of the elastic sealing material 28, and this portion is kept watertight.

[0017]

1 to 11 are views for explaining an embodiment of the present invention. The segment 1 of this embodiment is formed by forming a rectangular plate made of reinforced concrete into a shape curved in an arc shape.
The individual and one key segment 35 form a ring.

The segment 1 other than the segment 1 installed at the lowermost part of the ring shown in FIG. 7 of this embodiment is one of the circumferential joining surfaces 2 of the segment 1 which is orthogonal to the circumferential direction of the ring. A recess 3 is provided at the center of the joining surface 2 (the circumferential joining surface 2 shown on the lower side of FIG. 1).

One end of a filling material injection hole 7 is opened at a lower portion of the wall surface of the concave portion 3, and one end of an air vent hole 8 is opened at an upper portion of the wall surface. Is provided with a filler leakage preventing piece 9 made of a nonwoven fabric or the like.

The other end portions of the filler injection hole 7 and the air vent hole 8 are opened on the inner surface of the segment 1 (the upper surface in FIG. 1). As shown in FIG. 5, a heating electrode plate 14 is provided on a wall surface of the concave portion 3 of the one circumferential joining surface 2, and a heating electric wire 15 connected to the heating electrode plate 14 is provided.
, And a filler such as a rapidly hardening cement solution injected into the concave portion 3 is formed so as to harden more quickly.

As shown in FIG. 8, the recess 3 is provided between the circumferential joining surfaces 2.2 of the segments 1.1 so that the solution of the filler easily penetrates. Because the filled filler can be cured quickly, the depth of the recess 3 is
The minimum depth that the solution can penetrate.

The filler, which has been hardened after being injected into the concave portion 3, can sufficiently transmit a compressive force between the segments 1.1. Further, it is effective to transmit the bending compression force at the peripheral portion of the joining surface of the segments. Since the shortage of the cross section is negligible for the display of the combined bending strength in cooperation with the lining, even if the concave portion 3 is in the central portion, it is significant.

As shown in FIGS. 1 and 3, one end of a fastening material insertion hole 10b serving as a fastening material carry-in path is provided outside the recess 3 of the one circumferential joining surface 2 as shown in FIGS. The other end of the fastening material insertion hole 10 b is curved and opened to the inner surface of the segment 1.

The other circumferential joining surface 2 of the segment 1
In the (upper joint surface 2 in FIG. 1), a substantially straight fastening material insertion hole 10a serving as a fastening material insertion hole is provided with the fastening material insertion hole 10a.
It is provided at a position corresponding to b.

As shown in FIGS. 1 to 4, a rubber annular packing 19 is stretched around the peripheral edge of the one circumferential joining surface 2. As shown in FIG. 8, one of the circumferential joining surfaces 2 is connected to another segment 1.
Is inserted into the fastening material insertion hole 10a and the fastening material insertion hole 10b by inserting a flexible steel fastening material (not shown) into the fastening material insertion hole 10a and the fastening material insertion hole 10b. Hole 10
An adhesive such as a rapidly hardening cement solution or the like is injected into a.10b so that the joint fastening material can be fixed.

The segment 1 installed at the lowermost part of the ring shown in FIG. 7 is such that the circumferential joining surfaces 2 at both ends of the segment 1 are connected to the other circumferential joining surface 2 where the recess 3 is not provided. Is formed.

The segment 1 shown in FIG. 1 is one of the axial joining surfaces 23 (the axial joining surface shown on the right side of FIG. 1) of the axial joining surfaces 23 of the segment 1 which is orthogonal to the axial direction of the ring. 23), a rubber elastic seal member 28 formed in a square ring shape is stretched.

As shown in FIGS. 1 and 2, one side of the elastic sealing material 28 and one side of the annular packing 19 stretched over the one circumferential joining surface 2 are connected to each other.
The elastic seal member 28 is formed thicker than the annular packing 19.

The annular packing 19 and the elastic sealing material 28
At one connecting portion 29 in the circumferential direction of the segment 1
, And is formed so as to cover a corner 24 to which one of the axial joining surfaces 23 is connected.

The converging portions of the corners 24 of the two segments 1.1 of the preceding ring and the corners 24 of the two segments 1.1 of the following ring are described above. One side of the annular packing 19 and the elastic sealing material 2
8 is closed by a connecting portion 29 connecting one side portion thereof, and this portion is kept watertight.

One axial joining surface 2 of the segment 1
3 includes, as shown in FIG.
There are provided three fastening material insertion holes 10b similar to the fastening material insertion holes 10b provided on the other, and the other axial joining surface 23 has a fastening material insertion hole provided on the other circumferential joining surface 2. Three fastening material insertion holes 10a similar to 10a are provided, and are formed so as to be fastened by the joint fastening material (not shown).

At the top of FIG. 7, the key segment 35 inserted at the end of forming the ring is shown in FIGS.
As shown in FIG. 5, the other circumferential joining surface 2 of the adjacent segment 1 in the circumferential joining surface 2 and the peripheral edge of the circumferential joining surface 2 on the side other than the circumferential joining surface 2 to be joined first. A notch is provided, and an annular tubular packer 36 is mounted in the notch.

The tubular packer 36 is made of rubber and formed in a hollow body, and is connected to an air supply / discharge hose (not shown) and a filler hose. The said tubular packer 36 makes the inside of the tubular packer 36 a negative pressure, and reduces the tubular packer 36 into the packer inner surface 40 at the time of negative pressure and the packer outer surface 38 at the time of negative pressure as shown in FIG. , Key segment 35 is inserted between segments 1.1.

After the insertion, the inside of the tubular packer 36 is returned to normal pressure, and the tubular packer 36 is enlarged to the inner surface 39 of the packer at normal pressure and the outer surface 37 of the packer at normal pressure, and the other of the adjacent segments 1 is expanded. Close contact with the circumferential joining surface 2.

The circumferential joining surface 2 of the key segment 35 on which the tubular packer 36 is mounted has all the components such as the concave portion 3 other than the annular packing 19 on one of the circumferential joining surfaces 2 of the segment 1. Is what it is.

The circumferential joining surface 2 on the side of the key segment 35 which is first brought into close contact with the key segment 35 has the same structure as one of the circumferential joining surfaces 2 of the segments 1.
5 has the same structure as the one axial joining surface 23 of the segment 1, and the other axial joining surface (23) of the key segment 35 has the other structure. It has the same structure as the axial joining surface 23.

The recess 3 in the circumferential joining surface 2 of the key segment 35 may be formed on one of the circumferential joining surfaces 2. In the above embodiment, as shown in FIG. 6, a soft ground is excavated by a shield machine 45 or the like, and a segment 1 and a key segment 35 are assembled into a ring inside a shield tail plate 46 as shown in FIG. , Forming a preceding ring.

And forming said preceding ring,
On the other axial joining surface 23 side of the segment 1 where the elastic sealing material 28 is not provided, one axial joining surface of the lowermost segment 1 shown in FIG. 23 is placed in contact with it. Next, the other circumferential joining surface (2) at both ends of the lowermost segment 1
Next, one circumferential joining surface 2 of another segment 1 is
, And fastened with a joint fastener (not shown), a filler such as a rapidly hardening cement solution or the like is injected into the recess 3 from the filler injection hole 7, and the internal air is removed from the air vent 8. Then, the inside of the concave portion 3 is filled with the filler.

Then, if necessary, the heating electrode plate 14 is energized to accelerate the curing of the filler. After assembling the five segments 1 as described above, the key segment 35 is inserted between the upper segments 1.1.

The key segment 35 is reduced by applying a negative pressure to the inside of the tubular packer 36 to reduce the size of the key segment 3.
5 is inserted between the segments 1 and 1, the inside of the tubular packer 36 is returned to normal pressure, and the outer surface 37 of the tubular packer 36 at normal pressure is connected to the other circumferential joining surface 2 of the adjacent segment 1. Close contact.

If the outer surface 37 of the tubular packer 36 at normal pressure is not sufficiently close to the other circumferential joining surface 2 of the segment 1, compressed air is introduced into the tubular packer 36. After being fed and expanded and brought into close contact with the other circumferential joining surface 2 of the segment 1, the compressed air is replaced with a hardened cement solution or the like and fixed.

Then, the following ring formed by the following segment 1 and key segment 35 is pressed against the preceding ring, and the other axial joining surface 23 of the preceding segment 1 and the following segment One axial joining surface 2 of 1
The three spaces are fastened with a joint fastening material (not shown).

Further, each time the following segment 1 is assembled one by one, it is pressed against the preceding segment 1,
It is also possible to fasten with a joint fastening material. The primary lining is formed by the segment 1 and the key segment 35 as described above, and after penetrating the tunnel, a secondary lining 47 of reinforced concrete is wound inside the primary lining.

[0044]

According to the first aspect of the present invention, the concave portion 3 is provided between the circumferential joining surfaces 2 of the segments 1 orthogonal to the circumferential direction of the ring.
Is provided and the air vent hole 8 is provided, so that the filler is sufficiently penetrated and filled between the circumferential joining surfaces 2.

Therefore, when the filler is hardened, the space between the circumferential joining surfaces 2 between the segments 1 and 1 is filled with the hardened filler, and a large compressive force can be transmitted between the segments 1 and 1.

Since there is no looseness between the segments 1.1 due to the hardened filler injected between the segments 1.1, when a bending load is applied between the segments 1.1, the resistance to bending immediately increases. Occur.

Therefore, together with the secondary lining 47, which is formed of reinforced concrete or the like, does not loosen against bending, and immediately generates resistance, it exhibits combined bending strength jointly from the beginning of the bending load. , The bending strength increases.

Then, the circumferential joining surfaces 2 of the segments 1 1 are firmly connected to each other, and the deformation due to bending is small.
Therefore, there is little opening between the circumferential joining surfaces 2 due to the bending load, and water tightness can be maintained.

According to the second aspect of the present invention, an elastic sealing material 28 is further provided on a peripheral portion of one axial joining surface 23 of the segment 1, and one side portion of the elastic sealing material 28 and one circumferential joining surface are provided. The connecting portion 29 is formed by connecting one side of the annular packing 19 provided in the second portion.

Therefore, the converging portions of the corners 24 of the two segments 1.1 of the preceding ring and the corners 24 of the two segments 1.1 of the following ring are formed in an annular shape. One side of the packing 19 and the elastic sealing material 28
Can be closed by a connecting portion 29 connecting one side portion of the container, and this portion can be kept watertight.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a segment according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing one circumferential joining surface side of a segment according to an embodiment of the present invention.

FIG. 3 is a front view of one circumferential joining surface of a segment according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of one of the segments of the embodiment of the present invention on the side of the circumferential joining surface.

FIG. 5 is a sectional view showing a heating electrode plate provided in a concave portion of a segment according to one embodiment of the present invention.

FIG. 6 is a diagram showing an excavation state according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state where a secondary lining is performed according to an embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a state in which circumferential joining surfaces of segments according to an embodiment of the present invention are brought into contact with each other.

FIG. 9 is a cross-sectional view showing an abutment state of a circumferential joining surface between a segment and a key segment according to an embodiment of the present invention.

FIG. 10 is a perspective view of a circumferential joining surface of a key segment according to an embodiment of the present invention.

FIG. 11 is a sectional view showing a tubular packer according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 2 Circumferential joint surface 3 Concave part 7 Filler injection hole 8 Air vent hole 19 Annular packing 23 Axial joint surface 24 Corner 28 Elastic seal material 29 Connecting part

Claims (2)

(57) [Claims] 1. A segment 1 which can be formed into a ring by connecting a large number of segments. The segment 1 is provided at a central portion of one of the circumferential joining surfaces 2 of the segments 1 which is orthogonal to the circumferential direction of the ring. A concave portion 3 for filling material, which is connected to the filling material injection hole 7 and the air vent hole 8, an annular packing 19 is provided at a peripheral edge of the one circumferential joining surface 2, and the one circumferential joining surface 2 is provided. Is in contact with the other circumferential joining surface 2 of the other segment 1 and is fastened, and a filler material that is hardened after the injection is injected into the concave portion 3 so that a compressive force is applied between the abutting segments 1. A segment formed to be able to communicate. 2. One of the axial joining surfaces 23 of the segment 1 orthogonal to the axial direction of the ring.
An elastic sealing material 28 is provided on the peripheral edge of the segment 1, and one side of the elastic sealing material 28 is connected to one side of the annular packing 19 provided on the circumferential joining surface 2. The segment according to claim 1, wherein a connecting portion 29 is formed to cover the corner portion 24 where the surface 2 contacts one of the axial joining surfaces 23.