JPH0734785A - Shield segment joint method and device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shield segment joint method and device which have sufficient strength, durability, and water blocking ability and can meet the demand for high-speed shield excavation work. According to the shield segment joint method and device of the present invention, the shield segment (12) to be added is added.
The tip cone (22) is inserted into the male joint portion (16) provided at the distal end of the anchor muscle (14) of the, and is attached to the shield segment (10) already installed and outside the male joint portion (16). Insert into the female joint portion (24) having an opening (26) having a larger diameter than the diameter until the tip cone (22) abuts the insertion stop plate (30) through the opening (26). The male joint part (16) is further pushed into the inside of (24) to fix the fixed blade (2) at the tip of the male joint part (22).
0) along the tip cone (22) radially outward (R
It is deformed so that the diameter increases to O), and the joint male part and female part are joined by the misalignment adjusting plate (28).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield segment coupling method for continuously connecting, that is, adding, shield segments used for lining a drill hole drilled by a shield excavator, and an apparatus used therefor.

[0002]

2. Description of the Related Art Conventionally, as a technique for continuously connecting (adding) shield segments, bolts such as a through bolt type and a simple bolt type, a pin / hoso type, and others have been used. Is proposed.

Here, strength and durability are sufficient as a technique for replenishing the shield segments,
It is important that water resistance is guaranteed. In this respect, the through bolt bolt type has excellent properties as compared with other types.

[0004]

However, in recent years, there has been an increasing demand for rapid shield construction, but in order to join (add) shield segments to each other with through bolts, a bolt passing step and a nut tightening step are required. The two-step work is required. Therefore, it is not possible to cope with the increase in speed with the addition technology using through bolts.

On the other hand, in other conventional techniques, there are some that can cope with the speedup, but as described above, there is concern about the strength and durability of the joint and the waterproofness.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and has sufficient strength, durability, and water stoppage, and can meet the demand for high-speed shield excavation work. TECHNICAL FIELD The present invention relates to a shield segment joint method and device that can be used.

[0007]

A shield segment joint method of the present invention is a shield segment joint method for supplementing a shield segment used for lining a drill hole drilled by a shield excavator. Of inserting the tip cone into the male joint portion provided at the distal end of the anchor muscle, and the female joint portion attached to the already installed shield segment and having an opening having a diameter larger than the outer diameter of the male joint portion. Inserting the tip cone through the opening until it contacts the insertion stop plate, and further pushing the fitting male part into the fitting female part so that the fixed blade at the tip of the fitting male part moves radially outward along the tip cone. In the process of deforming to expand the diameter, the expansion of the fixed blades is constrained by the error adjusting plate to connect the male and female joints. Step allowed to include a city.

Further, the shield segment joint method of the present invention is attached to a shield segment to be replenished in a shield segment joint device for replenishing a shield segment used for lining a drill hole drilled by a shield excavator. The joint male portion, the tip cone to be inserted into the joint male portion, and the joint female portion attached to the shield segment already installed, the joint male portion is attached to the tip portion of the anchor muscle and the tip cone is A hollow member that can be inserted is included, and the distal end portion of the hollow member constitutes a fixed blade that is deformable so as to expand radially outward, and the female joint portion has a diameter larger than the outer diameter of the male joint portion. Includes an opening, an insertion stop plate to limit the insertion distance of the tip cone, and a misalignment plate to fix the expanding blades. Ri, tip cone is made near the distal end and such shape is the largest diameter.

In carrying out the present invention, inside the opening of the joint female portion, the dimensional difference between the outer diameter of the joint male portion and the inner diameter of the joint female portion opening is compensated, and the joint male portion and the female portion are joined. It is preferable that a misalignment adjusting plate is provided. It is preferable that the misregistration adjusting plate is formed in an annular shape, and the inner diameter thereof is equal to the outer diameter of the expanded fixed blade portion.

[0010]

According to the present invention having the above-mentioned structure, the portion (the tip of the hollow member) forming the fixed blade of the male joint of the joint provided at the tip of the anchor bar of the shield segment to be replenished is provided. Insert the tip cone. Then, the joint male portion together with the tip cone is inserted into the joint female portion through the opening.

If the tip cone comes into contact with the insertion stop plate, it cannot be inserted any further, but the male joint portion is further pushed and the insertion is continued. Here, when the joint male portion is pushed in with the movement of the tip cone being restricted, the tip cone has a maximum diameter in the vicinity of the tip portion, and the tip portion of the hollow member into which the tip cone is inserted ( Since the fixed blade can be deformed so as to expand radially outward, the fixed blade expands radially outward. As a result of the expansion of the diameter of the fixed blade, the fixed blade is constrained, the male joint portion engages with the inner side of the opening of the female joint portion, and the two are joined.

As is apparent from the above description, according to the present invention, the connection can be achieved only by inserting the male side of the joint, and unlike the case where the through bolt is used, the nut tightening step is not required. Speeding up is achieved.

Here, the inner diameter of the opening into which the tip cone and the male joint portion are inserted is set larger than the outer diameter of the male joint portion as described above, so that there is a margin at the time of insertion. It is set. Therefore, even if the work of adding the shield segments is rapidly performed, the work of inserting the male joint portion into the female joint portion can be reliably performed. In other words, there is some margin for joining the already installed segment (preceding segment) and the segment to be replenished (subsequent segment), so the fitting male part is well balanced with the opening of the fitting female part. It is fitted.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a shield segment (preceding segment) which has already been installed is indicated by reference numeral 10,
The shield segment (subsequent segment) to be added is indicated by reference numeral 12. The trailing segment 12 includes an anchor bar 14 and a tip portion of the anchor bar 14 (see FIG. 1).
In FIG. 3, the joint male portion 16 is provided at the lower end portion.

The male joint portion 16 includes a hollow member 18, and a tip portion (lower end portion in FIG. 1) of the hollow member 18 constitutes a fixed blade 20. In FIG. 1, the hollow member 18 is hatched, while the fixed blade 20
Has no hatching, but this does not mean that the hollow member 18 and the fixed blade 20 are separate members,
It is expressed that way for clarity. The hollow member 18 and the fixed blade 20 are integrally formed.

A tip cone 22 is inserted (fitted) into the male joint portion 16. The tip cone 22 is formed so that its lower end portion (a portion indicated by reference numeral MD) has a maximum diameter, and is in a so-called "tight fit" state with respect to the hollow portion 16 or the fixed blade 20. .

On the other hand, a female joint portion 24 is attached to the leading segment 10 side. An opening 26 is formed in this joint female portion 24, and the inner diameter of the opening 26, particularly the diameter on the opening inlet side (the upper side in FIG. 1), is the outer diameter of the joint male portion 16 or the maximum diameter of the tip cone (MD Diameter). A misalignment adjusting plate 28 and an insertion stop plate 30 are provided in the opening 26. The misalignment adjusting plate 40 has a structure in which it can move freely within the limited range of the joint female portion 24, and therefore,
Even if there is a misalignment of the ring joint between the preceding segment and the following segment, when the tip cone 22 is inserted, the misalignment adjusting plate 28 and the tip cone 22 automatically become concentric. The misalignment is absorbed and bonded without any trouble.

Next, with reference to FIGS. 2 to 4, a mode in which the succeeding segment 12 is added to the preceding segment 10 will be described.

Previous segment 10 and subsequent segment 12
1 is added, the trailing segment 12 is moved in the direction of arrow D in FIG. 1, and the tip cone 22 and the fixed blade 20 of the male joint portion 16 are inserted into the female joint portion 24 through the opening 26. . This insertion continues until the tip surface 32 of the tip cone 22 abuts the insertion stop plate 30 as shown in FIG.

In the state shown in FIG. 2, the fixed blade 20 is also inserted into the opening 26 (inside the female joint portion 24), but the relative positional relationship between the fixed blade 20 and the tip cone 22 is different from that in FIG. There is no. From the state of FIG.
By further moving in the direction of arrow D, the male joint portion 16 is further inserted into the female female portion 24.

Here, the fixed blade 20 has some flexibility, and is configured to be deformable or the diameter can be expanded outward in the radial direction (direction indicated by an arrow RO in FIG. 3). For example, as shown in FIG. 3, if the notch portions 34 are formed at a plurality of locations (four locations in FIG. 3) at equal intervals in the circumferential direction of the fixed blade 20 (see arrow C in FIG. 3), the radial outward direction is achieved. Flexibility is obtained such that the diameter is slightly increased.

Therefore, as described above, the succeeding segment 12
Is further moved in the direction of arrow D to further insert the joint male portion 16 into the joint female portion 24, the preceding segment 10 and the following segment 12 are joined, and the shoulder portion 36 of the joint male portion 16 is connected to the joint female portion 24. When the fixed blade 20 is inserted until it comes into contact with the surface 38, the fixed blade 20 expands radially outward and comes into contact with the misregistration adjusting plate 28, as shown in FIG. As a result, the joint male portion 16
The joint female portion 24 is connected to the joint female portion 24.

In the state shown in FIG. 4, the joint male portion 16
Since the shoulder portion 36 of the above is in contact with the surface 38 of the female joint portion 24, it does not move further in the direction of arrow D. On the other hand, the radially outer surface (indicated by reference numeral 20S) of the fixed blade 20 is in contact with the misalignment adjusting plate 28 to make a so-called "wedge" -shaped surface contact, so that the joint male portion 16 is moved in the direction of arrow U You can't move to. Therefore, in the state shown in FIG. 4, the male joint portion 16 and the female joint portion 24 are connected.

Here, in order for the fixed blade 20 and the misregistration adjusting plate 28 to abut properly, the inclined surface 40 of the misalignment adjusting plate 28 has a taper equal to the taper surface 42 of the tip cone 22. There is. When the fixed blade 20 expands in diameter, it deforms along the tapered surface 42 of the tip cone 22, so that the radially outer surface 20S of the fixed blade 20 becomes parallel to the tapered surface 42. Therefore, if the inclined surface 40 of the misregistration adjusting plate 28 and the tapered surface 42 of the tip cone 22 are configured to have the same taper, when they come into contact with each other, they are brought into surface contact with each other and a strong connection is achieved. is there.

Here, at the start of insertion shown in FIGS. 1 and 2, since the inner diameter of the opening 26 is larger than the outer diameters of the tip cone 22 and the male joint portion 16, there is a margin during insertion, and the insertion work Is extremely easy.

In the illustrated embodiment, a case is described in which the addition is made in the direction indicated by the symbol L in FIG. 5, that is, in the longitudinal direction of the excavation hole 50. However, it is also applicable to the joining of adjacent shield segments (reference numerals 54 to 62 in FIG. 5) in the circumferential direction CD. Further, the illustrated embodiment is merely an example,
It is additionally noted that the technical scope of the present invention is not limited.

[0028]

As described above, according to the present invention, the coupling is achieved only by inserting the male side of the joint, and unlike the case of using the through bolt, the nut tightening step is not required,
Moreover, since there is a margin in insertion and the insertion work is extremely easy, the speed of the replenishment work can be achieved. In addition, since the coupling between the male joint portion and the female joint portion is good, there is no problem in terms of strength, durability, and waterproofness.

[Brief description of drawings]

FIG. 1 is a sectional front view showing one step of a joining operation in one embodiment of the present invention.

FIG. 2 is a cross-sectional front view showing a step that is continuous with FIG.

FIG. 3 is a bottom view showing the positional relationship between the tip cone and the fixed blade.

FIG. 4 is a cross-sectional front view similar to FIGS. 1 and 2, showing a state where the joining work is completed.

FIG. 5 is a perspective view showing an arrangement relationship between an excavation hole and a shield segment.

[Explanation of symbols]

10 ... Shield segment already installed (preceding segment) 12 ... Shield segment to be added (succeeding segment) 14 ... Anchor bar 16 ... Male joint portion 18 ... Hollow member 20 ... -Fixed blade 22 ... Tip cone MD ... Maximum diameter portion near the lower end of tip cone 24 ... Joint female portion 26 ... Opening portion 28 ... Mismatch adjusting plate 30 ... Insertion Stop plate D, U ... Moving direction C ... Circumferential direction of fixed blade 32 ... Tip surface of tip cone 34 ... Notch portion 36 ... Shoulder portion of joint male portion 38 ... Joint Surface of female part 20S ... Radial outer surface of fixed blade 40 ... Sloping surface of misalignment adjusting plate 42 ... Tapered surface of tip cone 50 ... Excavation hole L ... Longitudinal length of excavation hole Direction CD: Circumferential direction of drilling hole 54, 6,58,60,62 ... shield segments

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Kawanami 4-18-17 Yotsugi, Katsushika-ku, Tokyo Koji Kaji Machine Works

Claims (2)

[Claims] 1. A shield segment joint method for replenishing a shield segment used for lining an excavation hole bored by a shield excavator, comprising a male joint portion provided at a tip end portion of an anchor line of a shield segment to be replenished. The tip cone to the insertion stop plate through the opening in the fitting female part that is attached to the already installed shield segment and has an opening with a diameter larger than the outer diameter of the fitting male part. Inserting until it abuts, pushing the fitting male part further into the fitting female part to deform the fixed blade at the tip of the fitting male part so as to expand radially outward along the tip cone, expanding the fixing blade. A step of connecting the male part and the female part of the joint by restraining the diameter with a misregistration adjusting plate, and the shield segmentation. Joint method. 2. A shield segment joint device for replenishing a shield segment used for lining an excavation hole drilled by a shield excavator, comprising: a joint male portion attached to the shield segment to be replenished; and a joint male portion. A tip cone to be inserted, and a female joint portion attached to a shield segment already installed, and a male joint portion includes a hollow member attached to the tip of the anchor muscle and into which the tip cone can be inserted. The tip part of the hollow member constitutes a fixed blade that can be deformed so as to expand radially outward, and the female joint part has an opening larger than the outer diameter of the male joint part and the insertion distance of the tip cone. The tip cone has a maximum diameter near its tip. The shield segment joint device is characterized in that it has a shape like