JP2001121526A - Form for molding segment for shield tunnel covering body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form being suitable for forming a segment with a fixing member for fixing a PC steel material on the inner face side and two cutouts corresponding this. SOLUTION: A form A for forming a segment 2 constituting a shield tunnel covering body 1 and with two cutouts 6 and 6 for fixing a PC steel material on the inner face side is provided and in this form A, a pair or more of cutout forming boxes 9 and 9 are fitted at specified related positions at key points of a part for forming the inner face side of a segment 2 and in these cutout forming boxes 9 and 9, a fixing member 10 with two through-holes 11 and 11 for the PC steel material is supported in such a way that the fixing face side of the through holes 11 and 11 are stabilized by bringing them into contact with supporting faces 9a and 9a of the cutout forming boxes 9 and 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming a segment for a shield tunnel lining body. More specifically, the present invention relates to a mold for forming a segment having a notch for fixing a PC steel material into which a prestress is introduced.

[0002]

2. Description of the Related Art By introducing prestress,
In a shield tunnel lining structure in which a plurality of segments are joined into an integral ring shape and the joined rings are also joined by introducing prestress, by providing a fixing part of PC steel material on the inner surface of the segment The lining body with almost uniform rigidity and sufficient strength can be obtained without causing large deformation at the joints or cracking of the segments, and the pre-stress is reduced. It is possible to control that the maximum value of the compressive stress acting on the segment becomes excessive, and to reduce the thickness of the member of the segment.
Inventions in which the amount of steel and concrete are reduced, the excavated cross-sectional area of the shield tunnel is reduced, and the economic efficiency is improved are disclosed in JP-A-10-238294 and JP-A-10-23.
No. 8294, JP-A-10-238294, JP-A-10-238294
-238294 and JP-A-10-238294.

However, in the shield tunnel lining of the invention described above, it is necessary to provide a segment having two notches for fixing a PC steel material on the inner surface side of the segment.
At present, there is no mold that can form a segment having such a structure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of this situation, and provides a formwork suitable for forming a segment having two notches for fixing a PC steel material on the inner surface side of a segment. That is the challenge.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a forming mold for a segment for a shield tunnel lining body according to the present invention is characterized by adopting the following constitution. (1) A formwork for forming a segment forming a shield tunnel lining body having two notches for fixing a PC steel material on an inner surface side, and the formwork forms an inner surface side of the segment. One or more notch forming boxes are attached at predetermined positions in the relevant portions, and a fixing device having two through holes made of PC steel is provided in these notch forming boxes. The surface side is in contact with the support surface of the notch forming box and is supported so as to be stable.

(2) After forming the segment by supporting the fixing tool in the notch forming box, the means for supporting the fixing tool in the notch forming box is removed, and the product is released from the mold.

(3) After forming the segment by supporting the fixing tool in the notch forming box, the means for attaching the notch forming box to the formwork is removed to release the product.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a mold for forming a segment for a shield tunnel lining according to the present invention.

In FIGS. 1 and 2, A is a segment 2 for a shield tunnel lining 1 for introducing a prestress.
FIG. 4 shows a mold for forming (see FIGS. 3 and 4). This form A
A platen 3 forming the inner surface of the segment 2, front and rear side frames 4 and 4 forming the peripheral surface, left and right end frames 5 and 5, and an upper frame forming the outer surface (not shown). Segment 2
In this configuration, a molding space conforming to the above is formed.

The characteristic structure of the mold A is that two fixing notches 6 and 6 are provided on the inner surface of the segment 2 for fixing a terminal of a PC steel material for introducing prestress. The PC steel material that fixes the terminal to these fixing notches 6, 6 is:
In forming the segment 2, a duct is formed by the insert of the sheath tube 7, and a PC steel material is passed through the duct.
One end is fixed to one fixing notch 6 and the other end is pulled in the other fixing notch 6 using a jack 8 or the like to introduce prestress.
Is generally performed in a segment into which a prestress is introduced, and a description thereof will be omitted.

In order to form the two fixing notches 6 and 6 for fixing the PC steel material to the segment 2 as described above, the notch forming boxes 9 and 9 are formed in the form A at a desired position on the surface plate 3. A fixing tool 10 made of PC steel, which is easily mounted and has a required strength, such as cast iron, is provided between the notch forming boxes 9, 9, and the fixing surface thereof has a supporting surface 9 a of the notch forming boxes 9, 9. A through-hole 1 is formed by interposing a support member, which will be described later, provided in the notch forming boxes 9, 9 in an X-shape with the fixing device 10.
By fixing the fixing tools 10 to the base plate 3 by engaging the notch forming boxes 9 and 9 with the opening 1, the fixing tools 10 are inserted between the fixing notches 6 and 6 by casting concrete. The segment 2 is formed.

Notch forming boxes 9, 9 in base plate 3 of form A
The attachment is performed by fastening with a bolt 12 as shown in FIG. 6, fastening with a bolt 12 with a lock nut 13 as shown in FIGS. 7 and 8, and attaching and detaching such as clamping with a screw clamp 14 as shown in FIG. Possible attachment methods and attachment methods that do not separate such as bonding with an adhesive tape and adhesion 15 with an adhesive can be adopted.

Next, several embodiments of the means for supporting the fixing device 10 by the notch forming boxes 9 will be described below. Usually, the two notch forming boxes 9 and 9 use the same supporting means. Therefore, in each embodiment, only the supporting means of the right notch forming box 9 is illustrated, and the supporting means of the left notch forming box 9 is illustrated. Omitted.

FIG. 5 shows the fixing device 1 using the notch forming box 9.
The method using the inclined dowels 16 as the support means for zero is shown.
The dowel 16 of this type is attached to the support surface 9a of the notch forming box 9 which is inclined upward by an attaching portion 16a, and the upper side engages with the upper side of the opening of the through hole 11 formed in the fixing device 10. However, the lower side is formed so as to become gradually thinner so as not to be engaged with the opening of the through hole 11.

In the support system using the inclined dowels 16, when the fixing tool 10 is pressed down toward the surface plate 3 while the fixing surface of the fixing tool 10 is aligned with the support surface 9 a of the notch forming box 9,
The opening of the through hole 11 opened in the fixing device 10 is
5, the fixing device 10 is supported by the inclined dowels 16 and is stabilized. Therefore, when concrete is poured into the formwork A in this state, the segment 2 into which the fixing tool 10 is inserted is formed. This segment 2 is not shown in the drawing, and this is the same in other embodiments described below. Molded segment 2
When removing the segment 2, when the segment 2 is pulled up, the opening of the through hole 11 opened in the fixing device 10 comes off the inclined dowel 16, so that the segment 2 is separated from the notch forming box 9 and is removed, and the fixing device 10 is removed. Is a segment 2 having fixing notches 6 and 6 on both sides of the segment.

In the method of supporting the fixing device 10 by the inclined dowels 16, when vibration or impact is applied to the mold A, the fixing device 1
Since there is a possibility that 0 may rise, the fixing device 10
It is preferable that a fixing member 17 is provided on the fixing member 10 and the fixing member 10 is stabilized by connecting the fixing member 17 and a reinforcing bar 18 arranged below the fixing member 10 with a wire rod 19.

FIG. 6 shows the fixing device 1 using the notch forming box 9.
A method using the reciprocating pin 20 as the zero support means will be described. The advance / retreat pin 20 of this type is provided with a through hole 1 formed in the fixing device 10.
A sliding shaft 23 supported by bearing plates 21 and 22 before and after attached to the notch forming box 9 is formed on the cutout forming box 9 side,
A spring 24 that pushes the reciprocating pin 20 toward the through hole 11 is provided on a portion of the sliding shaft 23 located between the bearing plate 21 and the reciprocating pin 20, and a spring 24 is provided between the bearing plates 21 and 22 of the sliding shaft 23. An operation piece 25 is protrudingly provided below the portion located at a position, and the operation piece 25 is formed on the surface plate 3 and the bottom piece of the cutout forming box 9 as shown in the circle of FIG. The stop hole 26 is provided with a front stop portion 26a for holding the advance / retreat pin 20 at the engagement position and a rear stop portion 26b for holding at the disengagement position.

In the supporting method using the advancing / retracting pins 20, the operating piece 25 is retreated to a position shown by a chain line in FIG.
, The retracting pin 20 is retracted and placed in the notch forming box 9, the fixing tool 10 is placed so that the fixing surface contacts the support surface 9 a of the notch forming box 9, and the operation piece 25 is stopped. When removed from the rear stop 26b,
The reciprocating pin 20 is fitted into the opening of the through hole 11 formed in the fixing device 10 by the force of a spring. Then, the operation piece 25 is engaged with the stop portion 26a on the front side of the stop hole 26, and
When 0 is locked, the fixing device 10 is supported by the advance / retreat pin 20 and is stabilized. Therefore, if concrete is poured into the mold A in this state, the segment 2 into which the fixing tool 10 is inserted is formed. When removing the segment 2, the operation piece 25 is used to pull out the advance / retreat pin 20 from the opening of the through hole 11 opened in the fixing device 10,
When the operation piece 25 is engaged with the rear blocking portion 26b of the blocking hole 26 and placed, the support of the fixing device 10 by the advance / retreat pin 20 is released. When the segment 2 is pulled up, the fixing device 10 is inserted into the segment 2 Is separated from the notch forming box 9, so that a segment 2 having two fixing notches 6, 6 formed at the separated portion is obtained.

FIG. 7 shows a system in which a bolt 27 and a nut 28 are used to support the fixing device 10 by the notch forming box 9. The nut 28 used in this method is formed in an oval shape as shown in a circle in FIG. 7, and a locking projection 29 is provided above and below the opening of the through hole 11 formed in the fixing device 10, so that the nut 28 is formed. 28 is turned sideways as shown by a chain line,
9 and inserted vertically into the opening, raised vertically and supported by the projection 29. Further, the bolt 27 is inserted into the notch forming box 9 from the window holes 30 and 31 provided in the surface plate 2 of the mold A and the bottom piece of the fixing tool 10, and a hole 32 formed in the support surface 9 a is formed.
Screwed into the nut 28 or removed.

The supporting method using the bolt 27 and the nut 28 is such that the nut 28 is locked by a projection 29 in the opening of the through hole 11 formed in the fixing device 10, and the fixing device 10 is
Is pressed into the notch forming box 9 so as to be in close contact with the support surface 9a, and a hand is inserted into the notch forming box 9 from the window hole 30 opened in the platen 3 of the mold A, and the nut 32 is transferred from the hole 32 of the support surface 9a. Screw in the bolt 27. Then, the fixing device 10 can stably cast the concrete 2 into the form A by the support of the bolt 27 to form the segment 2. However, when the product is molded, the bolt 2 screwed into the nut 28
When the fixing device 10 is removed, the fixing device 10 is released from the support by the notch forming box 9. Therefore, when the segment 2 is lifted, the segment 2 in which the fixing device 10 is inserted is separated from the notch forming box 9 and the two fixing notches 6 Is formed.

FIG. 8 shows a bolt and nut type bolt 27 shown in FIG. In this method, a rotating tool 34 attached to the other end of a flexible shaft 33 having a bolt 27 connected to one end.
From the window hole 30 formed in the surface plate 3 of the mold A so that the bolt 27 can be easily tightened and removed in the space below the surface plate 3. However, flexible shaft 3
The bolt 27 with three is difficult to guide it to be screwed into the nut 28. Therefore, the guide cylinder 35 is provided concentrically with the hole 32 inside the support surface 9a of the notch forming box 9.
And the flexible shaft 3
When the three bolts 27 are inserted, the bolts 27 are naturally guided to the nuts 28.

FIG. 9 shows a system in which the notch forming box 9 supporting the fixing tool 10 is attached to and detached from the platen 3 of the mold A. In this method, a window hole 30 is opened below a portion of the surface plate 3 where the notch forming box 9 is to be mounted, and the notch forming box 9 is placed on the window hole 30. In this case, the surface plate 3 and the notch forming box 9 Is positioned by a structure for inserting a positioning pin into a pin hole (a well-known one, not shown in the figure), and is positioned. The fixing portion is fastened and fixed by a screw type clamp 14, and the fixing device 10 is supported by the notch forming box 9. Flat dowel 3
7 is attached and used by the attachment portion 37a.

The attachment / detachment method of the notch forming box 9 by the screw clamp 14 is based on the support surface 9 a of the notch forming box 9.
The fixing tool 10 is held in a fixed position by engaging the flat dowel 37 provided in the above with the opening of the through hole 11 formed in the fixing tool 10.
Then, if concrete is poured into the mold A, the segment 2 into which the fixing tool 10 is inserted is formed.
However, when removing the segment 2, the screw clamp 14 that tightens the edge of the window hole 30 of the platen 3 and the window hole 31 of the notch forming box 9 is removed.
When the segment 2 is pulled up in this state, the segment 2 with the fixing tool 10 inserted therein is released together with the notch forming box 9. 9 is separated from segment 2 to obtain segment 2 having fixing notches 6 and 6.

FIGS. 10 to 11A and 11B show the fixing device 1.
Another method for attaching and detaching the notch forming box 9 that supports the “0” is shown. In this method, a plurality of automatic opening / closing chucks B are attached to the lower side of the form A where the notch forming box 9 of the surface plate 3 is mounted, and the holes 38 of the surface plate 3 are provided below the notch forming box 9. The attachment member 39 to be inserted into the automatic opening / closing chuck B is attached, and a locking head 40 is mounted on the tip of the mounting member 39. The upper and lower sides of the locking head 40 are conical surfaces 40a and 40a.
It is formed in the abacus ball which becomes b.

The automatic opening / closing chuck B has an outer cylinder 41 extending downward from the surface plate 3, and a lifting cylinder 42 is fitted to the outer cylinder 41. The lifting cylinder 42 has a lifting cam 43 at its lower edge.
And a pull-down spring 45 is externally mounted between a flange 44 provided outside the lower end and the lower end of the outer cylinder 41. A plurality of ball holes 46 slightly larger in diameter than the wall pressure of the lifting cylinder 42 are provided at equal intervals on the upper part of the lifting cylinder 42, and the balls 47 are movably moved in and out of the ball holes 46. On the inner periphery of the outer cylinder 41, there is provided an annular groove 48 for releasing the ball 47 to a position where the ball 47 does not touch the locking head 40, corresponding to the portion where the ball 47 is located when the lifting cylinder 42 is pushed up by the cam 43. It is provided. In addition,
For supporting the fixing device 10 by the notch forming box 9, a flat dowel 37 is used which engages the entire periphery with the opening of the through hole 11 formed in the fixing device 10 and suppresses the floating of the fixing device 10.

The notch forming box 9 is attached and detached by the automatic opening / closing chuck B. The lifting cam 43 is used to position the lifting cylinder 42 of the automatic chuck B at a position where the ball 47 in the ball hole 46 corresponds to the annular groove 48. The flat dowel 37 mounted on the support surface 9a is engaged with the opening of the through hole 11 formed in the fixing device 10, and the mounting member 39 of the notch forming box 9 supporting the fixing device 10 is shown in FIG. As shown in the drawing, the locking head 4 is inserted into the outer cylinder 41 through the hole 32 of the surface plate 3.
0 indicates that the ball 47 is formed in the annular groove 4 by the lower conical surface 40b.
8 to enter the elevating cylinder 42, and move to FIG.
When the cam 43 is moved away from the lower edge of the elevating cylinder 42 when it reaches a position below the ball 47 in the ball hole 46 as shown in FIG. Then, the ball 47 is pushed toward the center to engage with the inner wall of the elevating cylinder 42, and engages with the upper conical surface 40 a of the locking head 40 to chuck the locking head 40. For this reason, since the notch forming box 9 is fixed to the surface plate 3 and supports the fixing tool 10 in a fixed position, if the concrete is poured into the form A, the segment 2 in which the fixing tool 10 is inserted is formed. You. When the formed segment 2 is removed from the mold, the lifting cylinder 42 is pushed up by the rotation of the cam 43 to align the ball 47 with the annular groove 48. Since the ball 40 is pushed away by the upper conical surface 40a and escapes to the annular groove 48, the chucking of the mounting member 38 is released and the segment 2 is pulled up. Since the mold is removed along with the segment 2, if the notch forming box 9 is separated from the segment 2 after the mold is released, the segment 2 having the fixing notches 6, 6 is obtained.

[0027]

According to the first aspect of the present invention, a fixing device for fixing a PC steel material for introducing a prestress is inserted into the inner surface of the segment, and two fixing notches are provided at positions corresponding to the fixing surface of the fixing device. The segment for the shield tunnel lining can be simply and reliably formed, and the fixing operation of the PC steel material in the notch can be easily performed.

According to the second aspect of the present invention, the notch forming box is fixed to a mold frame, a fixing tool is supported on the form, and a product is formed. When the product is released from the mold, the support of the fixing tool is released. It can be fixed to the surface plate and released, so that the mold can be easily and quickly performed.

According to the third aspect of the present invention, a notch forming box supporting the fixing device is attached to a mold to form a product. When the product is released, the notch forming box is removed from the mold and removed together with the product. Since the notch forming box is detached from the product after the mold is released, the product can be easily removed from the product, and there is no occurrence of a defect in the fixing notch or the like during the release.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a forming frame of a segment for a shield tunnel lining body according to the present invention.

FIG. 2 is a plan view of the same mold.

FIG. 3 is a longitudinal sectional front view of a shield tunnel lining body formed by using a segment formed by the same mold.

FIG. 4 is a cross-sectional plan view of the lining body.

FIG. 5 is a longitudinal sectional front view of a main part of a method in which a fixing tool is supported by a notch forming box with an inclined dowel.

FIG. 6 is a longitudinal sectional front view of a main part of a system in which a fixing pin is supported by a notch forming box by a moving pin.

FIG. 7 is a longitudinal sectional front view of a main part of a system in which a fixing tool is supported by a notch forming box with bolts and nuts.

FIG. 8 is a longitudinal sectional front view of a main part of a system in which a fixing tool is supported by a notch forming box by a bolt and a nut with a flexible shaft.

FIG. 9 is a longitudinal sectional front view of a main part of a system in which a notch forming box supporting a fixing tool is attached to a surface plate by a screw clamp.

FIG. 10 is a longitudinal sectional front view of a main part of a system in which a notch forming box supporting a fixing tool is attached to a surface plate by an automatic chuck.

FIGS. 11 (a) and (b) are longitudinal sectional front views showing a state before and after the notch forming box is mounted by the automatic chuck of the above method.

[Explanation of symbols]

 A formwork 1 shield tunnel lining body 2 segment A formwork 3 surface plate 6,6 fixing notch 9,9 notch forming box 9a, 9a support surface 10 fixing tool 11,11 through hole

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[Procedure amendment]

[Submission date] November 19, 1999 (1999.11.
19)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

The attachment / detachment method of the notch forming box 9 by the screw clamp 14 is based on the support surface 9 a of the notch forming box 9.
The fixing tool 10 is held in a fixed position by engaging the flat dowel 37 provided in the above with the opening of the through hole 11 formed in the fixing tool 10.
Then, if concrete is poured into the mold A, the segment 2 into which the fixing tool 10 is inserted is formed.
However, when removing the segment 2, the screw clamp 14 that tightens the edge of the window hole 30 of the platen 3 and the window hole 31 of the notch forming box 9 is removed.
When the segment 2 is pulled up in this state, the segment 2 with the fixing tool 10 inserted therein is released together with the notch forming box 9. 9 is separated from segment 2 to obtain segment 2 having fixing notches 6 and 6.

Continuing from the front page (72) Inventor Yasushi Nonaka 1947, Okabe-cho, Okabe-cho, Shita-gun, Shizuoka Prefecture F-term in the Sato Kogyo Co., Ltd. GC03 GD08 GE01 GE11 GF08 GF26

Claims (3)

[Claims] 1. A mold forming a segment forming a shield tunnel lining body having two notches for fixing a PC steel material on an inner surface thereof, wherein the mold is formed on an inner surface of the segment. One or more notch forming boxes are attached at predetermined positions at key points of the portion forming the
A mold for forming a segment for a shield tunnel lining body, characterized in that a fixing device having two through holes made of PC steel is supported so that the fixing surface side of the through hole is in contact with a notch forming box and is stable. 2. After forming the segment by supporting the fixing tool in the notch forming box, removing the means for supporting the fixing tool in the notch forming box and removing the product. A mold for forming a segment for a shield tunnel lining body according to claim 1. 3. After forming the segment by supporting the fixing device in the notch forming box, removing the means for attaching the notch forming box to the formwork, and removing the product from the mold. Item 3. A mold for forming a segment for a shield tunnel lining body according to item 1.