JP2001090481A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high strength for a joint portion. SOLUTION: A male fittings 16 with a portion projecting out from a segment 3a1 is pressed to a recessed portion 18 formed in other segment 3a2 and these segments are jointed together. The inside of the segment having this kind of male fittings is filled with a predetermined filling material such as cement mortar, and an anchor bolt 19 is embedded for jointing purpose from the segment main portion 15 to the inside of the projected portion of the male fittings 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete segment (segment piece) used when constructing a tunnel by a shield method, and in particular, a male metal piece protruding and fixed to a segment is formed in another segment. The present invention relates to a segment having the male metal member which is pressed into a concave portion to join the segments.

[0002]

2. Description of the Related Art In the shield construction method, excavation is performed while excavating while protecting earth and sand in front of a tunnel with an outer shell (shield), and at the same time, the outer shell is extruded forward. The tunnel inner wall (lining) is formed by sequentially and successively laying the ring-shaped segments in the tunnel axial direction. Extrusion of the outer shell requires a large force of several hundred to several thousand tons, but the segments are subjected to the reaction force, and the outer shell is pushed forward with a jack.

FIG. 5 is a partially cutaway perspective view of a shield tunnel under construction, in which 1 is a shield machine, 1a is an outer shell made of cylindrical steel, 1b is a cutter head of an excavator, 2 is ground, and 3 is a segment. The ring, 3a is a segment, and 4 is a shield jack. The shield machine 1 is arranged at the head position of the tunnel under construction, and has a cylindrical outer shell 1a. A cutter head 1b for excavating the ground 2 is provided at a front portion of the outer shell 1a, and a plurality of shield jacks 4 are mounted on an inner periphery of a rear portion of the outer shell 1a. Each jack is selectively mounted at the front end of the segment so that a reaction force can be obtained. An erector (not shown) for assembling a segment is provided in a rear space 8 in the outer shell 1a so as to receive the segment from a transfer device (not shown), hold the segment, and rotate and position the segment. The segment 3a is located behind the shield shell 1a.
Is constructed and formed in a tubular shape. In the shield tunnel, segments 3a each formed in an arc shape are connected in the circumferential direction to form a segment ring 3, and the segment ring 3 is already built in the tunnel axial direction with the excavation of the shield machine 1. It is constructed by adding to a segment ring.

[0004] That is, an arc-shaped segment (segment piece) 3a having a predetermined width is assembled in a ring shape. One segment ring 3 is formed. The segments will be built in such a way that new segment rings are added in the traveling direction of the ring tunnel. Therefore,
The outer shell 1a of the shield machine advances at the front end of the latest segment ring in a manner to seek a reaction force, and a tunnel composed of the segment ring is constructed behind the shield machine 1 by the amount of advance.

[0005] The segment 3a is made of a material such as a concrete segment, a steel segment, a steel-concrete composite segment, and the like. When a concrete segment is used as a segment, in order to fasten adjacent segments to each other, a box-shaped depression called a bolt box and a bolt hole for joining are provided in the segment, and the bolt is used by using these. A segment joint for fastening is generally used (Japanese Patent Laid-Open No. 10-153095). However, bolt fastening has a problem that the work is troublesome, so recently, in order to achieve the mechanization of the segment assembly, a one-touch type fitting hardware that can be fastened by simply pressing a new segment against the already built segment has been developed. Various types have been developed.

FIG. 6 is an enlarged cross-sectional view of a conventional one-touch segment joint, and 3a ₁ and 3a ₂ are segments constituting adjacent segment rings. The conventional one-touch fitting hardware is a Okanamono 5 projecting fixed to one of the segments 3a ₁ side of the segment to be joined, the segments 3a so as to form a recess 7 a female fittings 6 to the other segment 3a ₂ side It is attached by embedding it in the concrete of No. ₂ and the male and female hardware 5, 6 are fastened by the pushing force by the machine. For this reason, the joint surface of the male metal part 5 to the female metal part 6 is required to have smoothness and adhesion, and corrosion resistance that does not damage even if friction occurs, and the surface of the male metal part 5 is subjected to powder coating. As an example of powder coating, there is known a method in which a thermosetting polyester urethane resin-based powder coating is applied using an electrostatic coating machine, a spray gun, or the like, baked and dried, and a top coat is applied as necessary.

[0007]

[SUMMARY OF THE INVENTION] However, as for steel adhesion when subjected to powder coating with respect to the concrete is deteriorated, pull-out strength is lowered against the concrete segments 3a ₁ male fittings 5, it affects the strength of the joint portion itself Problems arise. In view of the above, an object of the present invention is to provide a segment that can ensure high strength of a joint portion when using a one-touch joint metal fitting whose surface is powder-coated.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a segment having the above-described male metal fitting which joins segments by pushing a male metal material protruding and fixed to a segment into a concave portion formed in another segment. This is achieved by a segment in which the inside of the male hardware is filled with a predetermined filler, such as cement and mortar, and an anchor bolt is buried from the segment body to the inside of the protruding portion of the male hardware. Since the surface of the male hardware is subjected to powder coating, the portion embedded in the concrete has poor adhesion to the concrete, but the anchor bolt secures sufficient adhesion strength. Further, since the anchor bolt has a shape functioning as a reinforcing reinforcing bar inserted into the concrete in the male hardware, it is possible to improve the strength of the joint portion and the integrality between the segment body and the male hardware (that is, the joint strength).

[0009]

FIG. 1 shows a one-touch type joint.
FIG. 2 is an explanatory view of a method of joining the obtained segments.
FIG. As shown in FIG.
3t₁, 3a_TwoTunnel axial direction and tunnel circumferential direction
4 sides (joint side) 11₁~ 11_FourHas a joint
Is done. Of these, the connection of segments adjacent in the circumferential direction
A well-known quick joint is provided on the hand,
The illustration and description are omitted because they have no relation to the invention. Tonne
Segment 3a adjacent in the axial direction₁, 3a_TwoTo the joint
Is a one-touch type joint between rings. Sand
And segment 3a₁, 3a_TwoJoint surface 11₁, 11_TwoTo
A plurality (three in the figure) of one-touch joints are provided
And one segment 3a ₁Male part of the joint
12₁~ 12_ThreeTo the other segment 3a_TwoAt the joint
Female part 13₁~ 13_ThreeBy crimping to
Join.

As shown in FIG. 2, each of the segments (segment pieces) 3a ₁ and 3a ₂ used in the present embodiment has a concrete segment body 15 formed in an arc shape. on one of the joint surface 11 ₂ of the axially Yubu 12 ₁ to 12 _3, the female part _{131-134 3} is formed on the other joint face 11 _1. In other words, the male portion 12 ₁ to 12 ₃ of the three and the three female part _{131-134 3} is provided on the tunnel axis direction end surfaces of the segments 1 pc. The number of male and female portions is not limited to three, but may be two.

As shown in FIG. 3 (b), a male metal member 16 having a powder coating A applied on its outer surface is embedded in the male portion 12 _1, and half of the metal member 16 is embedded in the concrete forming the main body of the segment 3a _1. , With the other half protruding. The inside of the male hardware 16 is filled with cement mortar so as to be integral with the concrete of the segment body. Further, an anchor rod (anchor bolt) 19 made of a full threaded reinforcing bar, a deformed reinforcing bar, or the like is provided so as to be embedded from the inner end of the male metal member 16 to the inside of the segment body.
The anchor bolt 19 has a length approximately twice as long as the male hardware, and the length embedded in the male hardware 16 and the length embedded in the segment body are substantially equal.

[0012] the female portion 13 _1, as shown in FIG. 3 (a), provided in the form of female fittings 17 polyethylene foam 20 is coated on the outer periphery are embedded in the concrete in so as not to protrude from the segment ends A recess 18 is provided inside the metal fitting because the concrete is not filled. The length L1 of the concave portion 18 is formed slightly larger than the length L2 of the male metal member 17 protruding, and the inner diameter D1 of the female metal member 17 is formed slightly smaller than the outer shape D2 of the male metal member 16. In the embodiment, as shown in FIG.
1 = 44 mm and D2 = 45 mm. In like an anchor segment, already Tatekoma segment 3a ₂ female fittings 1
At 7, the male hardware 16 of the new segment 3 a ₁ is fastened by press-fitting using the pushing force of the shield jack. Male hardware 16 and female hardware 17 of this ring joint
At the time of engagement, slight displacement occurs in both positions and the direction of the axis, and the polyethylene foam 20 absorbs the displacement. Therefore, the two are correctly fastened without breaking the concrete of the segment body 15. Also,
Since the outer surface of the male hardware 16 is powder-coated, the male metal hardware 16 is smoothly fitted to the joint surface of the female metal hardware 17, and both are closely adhered. And, even if friction occurs due to the press-fitting of the male and female hardware, the corrosion resistance of the metal surface is ensured.

To manufacture the segment of the present invention, FIG.
First, a powder coating A is applied to the outer surface of the male hardware 16 as shown in FIG. For powder coating, use a metal coating machine such as an electrostatic coating machine.
The outer surface of No. 6 may be painted evenly, and it is not necessary to secure a non-painted portion. Next, as shown below, the inside of the male hardware is filled with an appropriate cement mortar 21, and the anchor rod 19 is inserted and cured. As the anchor rod, a rod having irregularities on the surface such as a deformed steel bar or a fully threaded steel bar is preferable. The length is preferably about twice as long as the male hardware 16. The male hardware with the anchor rod in this state is temporarily fixed together with the female hardware and a known quick joint embedded in the joint surface in the circumferential direction of the tunnel at a predetermined position of the mold frame 22 for forming a segment, and a concrete of a predetermined composition is formed. And filling.

By manufacturing the segment as described above, since the concrete is already contained in the male hardware 16 when the segment body 15 is poured into the concrete, no air remains in the male hardware. All parts that make up the segment can be filled with concrete. Therefore, high strength of the entire segment including the joint portion is guaranteed. In addition, since the surface of the male hardware 16 is coated with the powder coating A, the portion embedded in the concrete has poor adhesion to the concrete, but the anchor rod 19 can secure sufficient adhesion strength.
Further, since the anchor rod 19 has a shape functioning as a reinforcing steel bar inserted into the concrete in the male hardware, the strength of the joint portion and the integrality between the segment body 15 and the male hardware 16 (that is, the joint strength) are also improved. . As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.

[0015]

As described above, according to the present invention, the interior of the male hardware is filled with a predetermined filler, for example, cement mortar, and the anchor bolt is buried from the segment body to the inside of the protruding portion of the male hardware to form the segment. Therefore, even if the adhesion of the metal hardware whose surface is coated with powder to the concrete deteriorates, sufficient adhesion strength can be ensured by the anchor bolt. Further, since the anchor bolt has a shape functioning as a reinforcing reinforcing bar inserted into the concrete in the male hardware, it is possible to improve the strength of the joint portion and the integrality between the segment body and the male hardware (that is, the joint strength).

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a joining method of a segment having a one-touch joint.

FIG. 2 is a sectional view of a segment according to the present invention.

FIG. 3 is a partially broken external view of a male metal part and a female metal part of the joint between rings used in the present invention.

FIG. 4 is an explanatory diagram of a method for manufacturing a segment according to the present invention.

FIG. 5 is a partially cutaway perspective view of a shield tunnel under construction.

FIG. 6 is an enlarged sectional view of a conventional segment joint portion.

[Explanation of symbols]

3a ₁ , 3a ₂ ··· Segment (segment piece) 15 ··· Segment body 12 _{1 to} 12 ₃ ··· Male portion 13 _{1 to} 13 ₃ ··· Female portion 16 ··· Male hardware 17 ··· Female hardware 18 ··· Recess 19 ..Anchor bolt 20..Polyethylene foam

Claims (1)

[Claims] 1. A segment having a male metal member for joining a segment by pushing a male metal member protruding and fixed to a segment into a recess formed in another segment, wherein the inside of the male metal member is filled with a filler and A segment comprising anchor bolts buried from the main body to the inside of the protruding portion of the male hardware.