JP2002364295A - Segment with bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a technology for easily mounting a bag body, into which grout is injected, on a segment body. SOLUTION: In a segment with a bag, fixing rods 22 are inserted into cylindrical parts 21 formed on both opposed sides of the bag body 2, and ends 22a, protruded from the cylindrical parts 21, of the fixing rods 22 are welded to a skin plate 1b of the segment body 1 so that the bag body 2 can be easily mounted on the segment body 1 via the fixing rods 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for use in filling a backing material into a tail void (gap) formed between a cylindrical wall and an excavation hole during excavation of a tunnel by a shield excavator. For segments with bags.

[0002]

2. Description of the Related Art In order to quickly and accurately fill a tail void generated in a shield method with a backing material and to prevent the ground from loosening due to a fall of the ground, as shown in FIG. A segment Sa with a bag in which the bag 2 is attached to the outer peripheral surface has been developed.

[0003] The segment Sa with a bag is connected in a ring shape in the circumferential direction in the excavation hole H to form a cylindrical wall Ra, and is formed in the segment body 1 in the bag 2 of each segment Sa. The grout g is injected and filled from the injection hole 1a to expand the bag body 2 between the ground G and the cylindrical wall body Ra, and the bag body 2 extends in the direction of excavation of the excavation hole H so as to cross the tail void V.
Use with partitioning.

For this reason, the backing material is injected into the tail void V between the cylindrical wall body Rb and the ground G formed by the ordinary segment Sb without the bag body 2, and the backing material to the shield excavator is used. It can be carried out accurately at high pressure by preventing outflow of water.

[0005] By the way, the attachment of the bag body 2 to the segment main body 1 has conventionally been carried out as shown in FIG.
a and a fixing plate 11 having a plurality of mounting holes 11 b is applied to the inner surface of the bag body 2, and the peripheral portion of the through hole 2 a of the bag body 2 is sandwiched between the skin plates 1 b of the segment body 1.
1b to the mounting holes 2b, 1 of the bag 2 and the skin plate 1b.
c, a plurality of bolts 12 are inserted through the nuts 1 respectively.
3 is screwed. An injection socket 1d is formed inside the skin plate 1b and welded to form an injection hole 1a for grout g.
The center hole 11a of the fixing plate 11 communicates with the through hole 2a.

[0006]

In the above-described conventional bag-fixing method, the fixing plate 11 and the fixing holes 11b, 2b, 1c of the bag 2 and the skin plate 1b are aligned with each other, and then they are aligned with each other. It is necessary to insert a number of small and small bolts 12 in the bag body 2 into the mounting holes and screw the nuts 13 and tighten them with a fixed force. In particular, the mounting holes 2b of the bag body 2 There is a problem that the position is difficult to determine due to the elasticity and variability, and the fixing plate 11 and the bolt 12 must be operated via the bag body 2, which is very troublesome and troublesome.

Further, since a plurality of mounting holes 1c are formed in the skin plate 1b, it is difficult to use a packing or the like in a correct function state, and furthermore, the mounting is discontinuous, so that there is a dissatisfaction of poor liquid tightness.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a segment with a bag in which a bag can be easily attached to a segment body.

[0009]

In order to achieve the above object, the invention according to claim 1 is characterized in that the outer peripheral surface of a segment body connected in a ring shape in a circumferential direction in a drilling hole is filled with grout. In a segment with a bag in which a bag body inflated between the segment body and the ground is connected to an injection socket provided in the segment body so as to communicate with a through hole, the bag body has an outer periphery of the segment body. The ends of the fixing rods arranged along the surface and protruding on the opposite sides of the cylindrical portion of the fixing rod inserted into the cylindrical portions formed on the opposite sides of the bag form the outer peripheral surface of the segment body. And is attached to the segment body by welding to a skin plate. In the present invention, since the fixing rod inserted into the cylindrical portion formed in the bag body is fixed to the segment body by welding to the skin plate forming the outer peripheral surface of the segment body, a bolt and a nut are used. Adjustment of the fixing position is allowed as compared with the structure in which the end of the bag body is fixed to the skin plate, and the workability of positioning with respect to the skin plate can be remarkably improved. In addition, the entire region of the bag body where the fixing bar is integrated is simultaneously positioned with the segment main body at the same time as the positioning of the fixing bar, so that the number of positioning operations can be reduced.

According to a second aspect of the present invention, in the bag-equipped segment according to the first aspect, the pair of fixing rods extend along both ends of the curved portion of the segment body along the axial direction of the curved portion. The segment body is fixed to the outer peripheral surface. In the present invention, since the fixing rod extending along the axial direction of the curve of the segment main body can be a straight one, it is easier to handle as compared with the case where it is extended along the curve of the segment main body. Yes, it is possible to improve the workability of fixing to the segment body.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 10 show an embodiment of a segment with a bag according to the present invention. Segment S with this bag
x indicates that the bag body 2 is fixed to the outer peripheral surface of the skin plate 1b of the segment body 1 with the fixing cylinder 4, and both ends of the fixing rods 10 provided on both opposite sides of the bag body 2 are fixed to the skin plate 1b. Consisting of

The segment main body 1 is a well-known one. An arc-shaped main girder 1e, 1e and a quadrangular joint plate 1f, 1f are attached to an inner surface of an end of a skin plate 1b curved in an arc shape. ), And a plurality of vertical ribs 1h made of an angle material are attached to the inside of the main girders 1e, 1e and the joint plates 1f, 1f arranged in a box shape by welding or the like, and injected into the inner surface of the skin plate 1b. The socket 1d is welded by forming an injection hole 1a of a grout g (see FIG. 11), and welding the locking members 1i, 1i made of an equilateral angle material to the outer surface of the end of the skin plate 1b along the main girder 1e. It is manufactured.

The injection socket 1d has a circular cross section and has an internal thread 1j formed on the inner surface. The skin plate 1b, the injection socket 1d, the main girder 1e, the joint plate 1f, the vertical rib 1h, and the locking member 1i are made of metal such as steel. The bag body 2 is made of a breathable cloth material such as a civil engineering sheet.

The fixed cylinder 4 is formed by welding a flange 4b to one end of a cylindrical section 4a having a circular cross section, welding an operating rod (operating means) 4c to the outer surface of the flange 4b across the center of the cylindrical section 4a. Injection socket 1d on the outer surface of the other end of portion 4a
It is manufactured by forming a male screw 4d to be screwed into the female screw 1j. The flange 4b may have a circular shape as shown in FIG. 5 or a rectangular shape as shown in FIG. The fixed cylinder 4 can be made of a metal material such as steel, can be made of a synthetic resin or a casting, and can also be formed integrally with the cylinder 4a, the flange 4b, and the operation rod 4c.

The bag body 2 is disposed along the outer peripheral surface of the segment main body 1, and both ends of the curve of the outer peripheral surface of the segment main body 1, that is, in FIG.
A cylindrical portion 21 is formed at a position corresponding to both left and right lower ends, and a metal fixing rod 22 is inserted into the cylindrical portion 21 so as to oppose both sides (axial direction) of the cylindrical portion 21. both sides)
The ends 22a of the fixing rods 22 protruding from the main body are welded to the skin plate 1b, respectively, and attached to the outer peripheral surface of the segment main body 1. FIG. 7 shows the cylindrical portion 21.
1 and the like, the illustration of the tubular portion 21, the fixing bar 22, and the like is omitted in FIG.

The tubular portion 21 is a portion formed by bending and sewing a cloth material, which is a material of the bag 2, into a tubular shape. More specifically, as shown in FIG. Of the cloth 23 (hereinafter, referred to as “bottom cloth 23”) is folded back toward the bottom side (the lower side in FIG. 8) of the bag body 2 and sewn to the bottom cloth 23 to form a tubular portion. is there. In FIG. 8, reference numeral 21a denotes a sewn portion. The fixing bar 22 is a round bar or a square bar made of metal such as a steel bar, for example, is formed to be slightly longer than the cylindrical portion 21, and is inserted in a state where both ends 22 a protrude from the cylindrical portion 21. ing.

In order to attach the bag body 2 to the outer peripheral surface of the segment main body 1, first, a fixed cylinder 4 forming a grout hole is used.
After tightening to the segment body 1 side (specifically, tightening to the injection hole 1a), the end 22a of the fixing rod 22 protruding from the cylindrical portion 21 is fixed to the skin plate 1 made of a steel plate or the like.
b.

The fixed cylinder 4 may be placed in the bag 2 in advance when the bag 2 is manufactured, or the through-hole 2 may be formed after the bag 2 is manufactured.
a. The flange 4 of the fixed cylinder 4
An annular washer 6 sandwiched between b and the bag body 2 is also put into the bag body 2 in the same manner as the fixed cylinder 4.

When the bag 2 is attached to the segment body 1, the washer 6 is fitted into the tube 4a, and then the tube 4a is taken out of the through hole 2a of the bag 2, and the injection socket of the segment body 1 is inserted. Attach 1d position. At this time, an annular packing 7 such as rubber is inserted between the periphery of the through hole of the bag body 2 and the skin plate 1b.

In the above state, the operating rod 4c of the fixed cylinder 4 is grasped from above the bag body 2, and the fixed cylinder 4 is turned to screw the male screw 4d of the cylindrical portion 4a into the female screw 1j of the injection socket 1d. Thereafter, the tip of a tool (for example, a special tool having a U-shaped tip) is inserted into the bag body 2 from the injection hole 1a, and the operating rod 4c is rotated to move the fixed cylinder 4 to the injection socket 1d.
Strongly. In some cases, it is also possible to turn the fixed cylinder 4 while holding the flange 4b from above the bag body 2. In this case, the fixed cylinder 4 in FIG. 6 in which the flange 4b is square is easier to rotate than the circular flange in FIG. The operation rod 4c facilitates confirmation of retightening and the like.

At the time of rotating the fixed cylinder 4, the washer 6 prevents twisting of the bag body 2 by the flange 4b and keeps the predetermined state, and after the fastening of the fixed cylinder 4, that is, after the attachment of the bag body 2 is completed. The packing 7 is the skin plate 1b
To improve the liquid tightness and prevent the fixed cylinder 4 from loosening.

The fixed cylinder 4 is located on the bag 2 or the injection hole 1.
Since the operation can be performed easily and accurately from any one of the above items a, the bag 2 can be quickly and efficiently attached to the segment main body 1. Furthermore, since the periphery of the through hole of the bag body 2 is uniformly tightened over the entire circumference by the flange 4b, the liquid tightness is further improved.

When the fastening of the fixing cylinder 4 is completed, the fixing rod 22 is pulled while preventing unnecessary twisting or the like from being formed in the bag body 2, and the fixing rod 22 is moved to the position of the curved end of the outer peripheral surface of the segment body 1. 22 and the end 22a of the fixing rod 22 protruding from the cylindrical portion 21 is fixed to the skin plate 1b by welding. Thereby, the segment body 1
The fixing of the bag 2 with respect to is completed. At this time, since the entire side of the bag 2 is positioned on the skin plate 1b by the positioning of one fixing rod 22, the positioning operation of the fixing rod 22 with respect to a target fixing position on the skin plate 1b can be efficiently performed. I can do it. In addition, the behavior of the bag body 2 at the time of inflation is stabilized by eliminating the twisting or unnecessary loosening of the bag body 2 by the pulling operation of the fixing rod 22 (for example, the protection plate at the time of inflation of the bag body 2). 9 smoothly escapes from between the locking members 1i), and the bias of the expansion can be reliably prevented. Even after the fixing rod 22 is fixed, the positioning of the portion of the bag 2 along the tubular portion 21 with respect to the segment body 1 is maintained. The installation state is maintained stably.

As shown in FIGS. 7 and 10, although the bag 2 has a substantially rectangular shape in plan view substantially corresponding to the outer peripheral surface of the segment body 1 in rectangular shape in plan view, four corners of the rectangle are cut out. It has a shape in which a recess 24 is formed. End 22a of fixed rod 22 protruding from cylindrical portion 21
Is welded to the skin plate 1b in the recess 24 (within a range that does not protrude outward from the extension of the long side 25 or the extension of the short side 26 of the rectangular shape in plan view), and therefore projects from the cylindrical portion 21. It is possible to prevent the end 22a of the fixed bar 22 from interfering with the operation of installing the segment at an adjacent location. Further, there is an advantage that it is possible to prevent the bag body 2 from interfering with the welding work of the fixing rod 22 to the skin plate 1b, and to improve welding workability. Further, in the configuration in which the fixing rod 22 is fixed to the skin plate 1b by welding, finer position adjustment is allowed as compared with a fixing structure using bolts and nuts.
There is an advantage that the labor required for the positioning operation and the fixing operation of Step 2 is greatly reduced. The fixing bar 22 can be easily obtained with a desired length by appropriately cutting the long member.

As shown in FIG. 9, the bag body 2 of this segment is formed to be flexible as a whole, and can be wound around the fixing rod 22 as a core. In the wound state, it is very convenient to carry in to the site, and the operability of assembling the bagged segment at the site can be greatly improved.

The bag body 2 attached to the segment body 1 as described above is housed between the locking members 1i, 1i together with a protection plate 9 such as a steel plate in a contracted and folded state as shown in FIG. . The protection plate 9 is provided so as to cover the outer surface of the bag body 2 with both sides thereof being locked by the locking members 1i, 1i, and a seal brush (shown in the drawing) of a shield machine sliding on the outer surface of the segment. The bag 2 is prevented from being deformed or damaged due to the above-mentioned method, and when the bag 2 is inflated by filling with grout, the bag 2 is deflected by the inflation pressure and detached from the locking members 1i, 1i and pressed against the ground. ing. Needless to say, grout g is injected into the bag body 2 through the injection hole 1a as in the related art. After filling the grout, plug 8
Into the female screw 1j to close the injection hole 1a.

In the present invention, the specific shapes and the like of the cylindrical portion and the fixing rod are not limited to those shown in the drawings, and various designs can be changed as needed. The segment body 1 is not limited to steel, but can be made of concrete (however, the skin plate is made of a metal such as steel, which is easily welded).

[0028]

As described above, according to the first aspect of the present invention, the fixing rod is positioned and fixed with respect to the segment body, and at the same time, the entire region of the bag body where the fixing rod is integrated. Are positioned on the segment body, and the fixing operation can be performed efficiently. Also, since the fixing rod is fixed to the segment body by welding to the skin plate, the workability for positioning the skin plate can be greatly improved compared to the fixing structure using bolts and nuts, and the bag body for the segment body can be improved. An excellent effect is achieved in that the overall positioning and the fixing work time can be reduced.

According to the second aspect of the present invention, the pair of fixing bars are fixed to the outer peripheral surface of the segment main body by extending along both ends of the curve of the segment main body in the axial direction of the curve. The straight bar can be adopted as the fixing rod extending along the axial direction of the curve of the segment main body, so that it is easier to handle as compared with the case where it is extended along the curve of the segment main body. Therefore, an excellent effect of improving the workability of fixing to the segment body can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing an embodiment of a segment with a bag according to the present invention.

FIG. 2 is a bottom view of the segment main body of FIG.

FIG. 3 is a cross-sectional view showing a structure for fixing a bag body to a segment body.

FIG. 4 is a diagram showing a relationship between a bag, a protection plate, a skin plate, and the like.

FIG. 5 is an external view of a fixed cylinder.

FIG. 6 is an external view showing another example of a fixed cylinder.

FIG. 7 is a perspective view showing an embodiment of a segment with a bag according to the present invention, particularly showing a bag.

FIG. 8 is a sectional view showing a tubular portion formed on the bag body of the segment with a bag according to the present invention.

FIG. 9 is a view showing a wound state of the bagged segment according to the present invention.

FIG. 10 is a plan view showing a bag body of the segment with a bag of FIG. 7;

FIG. 11 is a cross-sectional view showing an example of using a segment with a bag.

FIG. 12 is a cross-sectional view showing a conventional attachment and fixing structure of a bag body to a segment body.

[Description of Signs] Segment with Sx bag H Drilling hole g Grout G Ground 1 Segment body 1b Skin plate 1d Injection socket 2 Bag body 2a Through hole 21 Cylindrical part 22 Fixed rod 22a end (end of fixed rod)

Claims (2)

[Claims] 1. A bag body, which is inflated between the segment body and the ground by filling with grout, is provided on an outer peripheral surface of the segment body connected in a ring shape in a circumferential direction in a borehole. In the bag-equipped segment attached to the provided injection socket so as to communicate with the through hole, the bag is disposed along the outer peripheral surface of the segment body, and cylindrical portions formed on opposite sides of the bag. The fixing rod inserted into the bag is attached to the segment main body by welding the ends protruding from both sides of the cylindrical portion facing each other to a skin plate forming the outer peripheral surface of the segment main body. With segment. 2. The segment body according to claim 1, wherein the pair of fixing rods are fixed to the outer peripheral surface of the segment body by extending along both ends of the curve of the segment body along the axial direction of the curve. Item 2. A segment with a bag according to Item 1.