JP3474388B2 - Segment joint structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a segment that forms a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them to each other.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a so-called shield construction method is generally used in which segments (mainly made of concrete or steel) are assembled on the inner surface side of an excavation hole to construct a tubular wall body. As the segments used in this shield construction method, those having a rectangular shape in a plan view and an arc plate shape are mainly used, and these segments are joined together by bolts. The structure for joining the segments with each other by this bolt is to embed a joint plate having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other in the vicinity of the joint surfaces of the segments. In general, a bolt is inserted into the hole of the and the nut is fastened to the bolt to join the bolt. Further, there is also a structure in which insert metal fittings, which are nut members, are embedded in mutual segments, and bolts penetrating adjacent segments are fastened to join them.

[0003]

However, in the above structure, the bolt is inserted into the hole formed in the joint surface of the joint at the construction site, and the nut is fastened to the bolt or embedded in the mutual segments. Since the extremely complicated work of fastening the bolt to the insert metal fitting is required, there is a limit in shortening the assembly time, and it is difficult to adapt to automatic assembly by a robot. Furthermore, even if the secondary lining is omitted, the bolt box formed in the segment must be closed in order to attach the bolts and nuts, which is a new joint in order to speed up construction and save labor. It was the current situation that the development of the structure was urgent.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a segment joint structure capable of extremely easily and reliably joining segments to each other.

[0005]

In order to achieve the above object, a joint structure for a segment according to a first aspect of the present invention is configured such that the joint surfaces of the segments are slid so that the joint surfaces are joined together. In the joint structure, a base plate, a rod body erected on the base plate, and a diameter larger than the rod body provided at the tip of the base plate are formed on one joint surface. It has a male joint composed of a locking portion, and a cutout portion on which the rod body can be fitted from the side is formed on the other joint surface, and the rod body is slid and fitted into the cutout portion. While having a female joint made of a locking plate that locks the locking portion on the back surface side by being fitted between the locking portion of the rod and the base plate, the rod has
A spacer that secures a space between the base plate and the locking portion is provided, and a bending force applied to the rod body is provided on the spacer on the side opposite to the fitting direction of the locking plate to the rod body. It is characterized in that it is provided with a support portion for receiving it.

The joint structure of the segment according to claim 2 is
2. The segment joint structure according to claim 1, wherein the spacer bends a metal plate having a width dimension substantially the same as the thickness dimension of the locking plate into an arc shape on one side and a rectangular shape on the other side. The rod body is inserted into the arc-shaped portion, and the rectangular portion serves as the support portion. The segment joint structure according to claim 3 is the segment joint structure according to claim 1, wherein the spacer is provided on a metal block having a thickness dimension substantially the same as a thickness dimension of the locking plate. It is characterized in that a through hole which can be inserted is formed and the support portion is made of a solid portion of a metal block.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a joint structure for a segment according to the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 1 is a segment. This segment 1
Is a segment made of concrete formed in a trapezoidal shape in plan view, and the joint surface 2 in the circumferential direction is an arc plate inclined with respect to the axial direction of the excavation hole. By doing so, the ring forming the tubular wall body is constructed. These segments 1 are composed of a male segment 1A and a female segment 1B, and these male segment 1A and female segment 1B are alternately connected in the circumferential direction. The male segment 1A is provided with a male joint 3, and the female segment 1B is provided with a female joint 4 to which the male joint 3 of the male segment 1A is joined.

The male joint 3 is, as shown in FIGS. 5 and 6,
A base plate 6 having a hole 5 formed substantially at the center, a cap nut 7 fixed at a position where the hole 5 is communicated with the back surface of the base plate 6, and a back plate of the base plate 6 are fixed. A pair of side plates 8 and bolts (rods) which are inserted into the holes 5 from the surface side of the base plate 6 and fastened to the cap nuts 7 so as to be protruded with the base plate 6 side as the base end.
The side plate 8 is provided with an anchor 10 for fixing the male joint 3 to the segment 1. The head 11 of the bolt 9 of the male joint 3 serves as a locking portion.

The bolt 9 of this male joint 3 is attached to the washer 2
1 is provided, the spacer 22 is attached to the bolt 9 via the washer 21, and the washer 21 is supported by the spacer 22 below the head 11 of the bolt 9 and the head 11 of the bolt 9 is The space between the bottom and the base plate 6 is ensured to have a predetermined size. The washer 21 attached to the bolt 9 is made of a harder material than a locking plate 13 (which will be described later) that constitutes the female joint 4, and the lower end side thereof is formed at an acute angle over the circumferential direction.
This washer 21 serves as a cutting portion.

Further, the spacer 22 attached to the bolt 9
As shown in FIGS. 7 and 8, has a bolt insertion portion 22a through which the bolt 9 is inserted, and a support portion 22b provided integrally with the bolt insertion portion 22a. The spacer 22 is formed by bending a strip-shaped metal plate having a width dimension substantially the same as the thickness dimension of the locking plate 13 described later by bending one side into an arc shape and the other side into a rectangular shape. . That is, it is formed by bending the middle portion of the metal plate in an arc shape, bending the portions in the vicinity of both ends at right angles in the direction of approaching each other, and connecting the both ends by welding. Protruding portions 22c that protrude inward are formed in the intermediate portions on both sides of the spacer 22, and the bolt 9 is inserted into the portion surrounded by the protruding portions 22c and the arc-shaped portion. A rectangular portion which is the bolt insertion portion 22a, which is bent in a direction approaching each other and joined by welding is used as the support portion 22b.
The b side is arranged between the washer 21 and the base plate 6 on the side opposite to the fitting direction with the female joint 4.

The female joint 4 is, as shown in FIGS. 5 and 6,
It has a locking plate 13 in which the notch 12 is formed, and a pair of side plates 14 are fixed to the back side of the locking plate 13,
A bottom plate 15 having an L-shaped cross section is provided between the side plates 14. Further, the side plate 14 is provided with an anchor 16 for fixing the female joint 4 to the segment 1. The cutout portion 12 of the locking plate 13 of the female joint 4 is formed in a tapered shape in the vicinity of the end portion thereof so as to gradually widen toward the end portion.
On the back surface side of the locking plate 13 near the end of the cutout 12, a tapered surface 17 is formed which is inclined from the end in a direction in which the thickness gradually increases. And the base plate 6 of the male joint 3
And a washer 2 supported at the bottom of the head 11 of the bolt 9
The dimension of the bottom portion of 1 is substantially the same as or slightly larger than the thickness dimension of the locking plate 13 that constitutes the female joint 4 having the above configuration.

In order to join the male segment 1A having the male joint 3 having the above structure and the female segment 1B having the female joint 4, the male segment 1A and the female segment 1B are slid to each other, Female segment 1
The bolt 9 forming the male joint 3 of the male segment 1A is locked in the notch 12 of the locking plate 13 forming the female joint 4 of B. By doing so, the bottom portion of the washer 21 supported by the lower portion of the head 11 of the bolt 9 contacts the tapered surface 17 of the locking plate 13, and is guided in the inclined direction of the tapered surface 17 so that the rear surface of the locking plate 13 is guided. Step into the side. Then, when the bottom portion of the washer 21 enters the back surface side of the locking plate 13 in this manner, the back surface of the locking plate 13 is scraped by the cutting portion of the washer 21.

Then, together with the bolt 9, the male joint 3 is pulled toward the female joint 4, and the male segment 1A and the female segment 1B are firmly pressed together at their joint surfaces 2 as shown in FIG. It is joined in a closed state. In addition, a part of the locking plate 13 that is scraped at the time of joining is formed by the locking plate 13 and the washer 2.
These male joints 3
And the female joint 4 are firmly joined.

Here, as described above, when the bolt 9 constituting the male joint 3 is fitted into the notch 12 of the locking plate 13 constituting the female joint 4, the bolt 9 is directed toward the fitting direction. Although a bending force is applied by the bolts 9, the spacer 22 provided on the bolt 9 has a support portion 22 interposed between the washer 21 provided on the bolt 9 and the base plate 6 on the side opposite to the fitting direction.
Since b is provided, the bending force applied to the bolt 9 is received by the support portion 22b. That is, when the spacer 22 having the support portion 22b is not attached or when the cylindrical spacer is attached, the bolt 9 is deformed when fitted with the locking plate 13, as shown in FIG. In the case of the form example, as described above, since the bending force applied to the bolt 9 is received by the support portion 22b of the spacer 22 attached to the bolt 9, the deformation of the bolt 9 is reliably prevented.

As described above, according to the segment joint structure of this embodiment, the male segment 1A is inserted into the notch 12 formed in the locking plate 13 of the female joint 4 of the female segment 1B. By inserting the bolt 9 provided in the male joint 3, the head 11 of the bolt 9 is very easily locked to the rear surface side of the locking plate 13 via the washer 21, and the locking force causes the male segment. A ring can be constructed by circumferentially joining 1A and the female segment 1B. As a result, compared to the conventional fastening structure using bolts and nuts or the fastening structure that fastens bolts to the insert fitting, the labor required for joining the segments 1 to each other can be significantly reduced and the automatic assembly by the robot is easy. Moreover, since there is no bolt box or the like, the work of closing the bolt box can be omitted.

Further, the spacer 22 mounted on the bolt 9 for restricting the screwing amount of the bolt 9 into the base plate 6 has a support portion 22b for receiving the bending force received by the bolt 9 when fitted with the locking plate 13. Since the bolt 9 is provided, the deformation of the bolt 9 due to the bending force can be reliably prevented, and thus the bolt 9 and the locking plate 13 can be fitted well. That is, it is possible to reliably prevent the fitting failure with the locking plate 13 due to the deformation of the bolt 9.

Moreover, the notch 1 of the locking plate 13 of the female joint 4
The rear surface side in the vicinity of 2 is a tapered surface 17, and the head 11 of the bolt 9 of the male joint 3 is guided to the rear surface side of the locking plate 13 by the tapered surface 17 so that the bolt 9 of the male joint 3 is disposed. The head 11 of the female joint 4 of the locking plate 1
By engaging with the notch 12 of 3, the female joint 4 and the male joint 3 are pulled close to each other, and the joint surface 2 of the female segment 1B and the joint surface 2 of the male segment 1A are extremely strongly joined. You can

Further, at the time of joining, the locking plate 13 of the female joint 4 is scraped by the washer 21 provided on the bolt 9 of the male joint 3 to firmly join the male joint 3 and the female joint 4 together. Thereby, the joining surface 2 of the female segment 1B and the joining surface 2 of the male segment 1A can be joined extremely strongly.

11 and 12 show a spacer 22 having another structure. This spacer 22 is the locking plate 1
In a block of metal or the like having a thickness dimension substantially the same as the thickness dimension of 3,
A bolt insertion portion 22a through which the bolt 9 is inserted is formed, and a part thereof serves as a support portion 22b. Further, according to this spacer 22, since the support portion 22b is pure, it is possible to more reliably receive the bending force applied to the bolt 9.

In the above example, the head 1 of the bolt 9 is used.
A washer 21 that scrapes the locking plate 13 at the time of joining is provided at the lower part of the head 1 of the bolt 9 without the washer 21.
Alternatively, the locking plate 13 may be scraped by 1. In addition, the segment 1 to be joined in the above embodiment is not limited to concrete, but may be steel.

[0021]

As described above, according to the segment joint structure of the present invention, the following effects can be obtained. According to the segment joint structure of claim 1, by inserting the rod body provided in the male joint from the side into the notch formed in the locking plate of the female joint, it is extremely easy to
Lock the locking part at the tip of the rod to the back side of the locking plate,
The locking force allows the segments to be joined together. As a result, compared to the conventional fastening structure with bolts and nuts or the fastening structure that fastens bolts to the insert fittings, the labor required for joining the segments can be significantly reduced and the automatic assembly by the robot is facilitated. Moreover, since there is no bolt box or the like, the work of closing the bolt box can be omitted. In addition, since the spacer mounted on the rod body is provided with a support portion that receives the bending force that the rod body receives when fitted with the locking plate, deformation of the rod body at the time of fitting with the locking plate. Can be reliably prevented, and thus, the rod body and the locking plate can be satisfactorily fitted. That is, it is possible to reliably prevent the fitting failure with the locking plate due to the deformation of the rod body.

According to the segment joint structure of the second aspect, since the spacer is formed by bending the metal plate, the spacer can be easily manufactured and the cost thereof can be reduced. be able to. According to the joint structure of the segment described in claim 3, since the solid portion of the metal block serves as the support portion, the bending force applied to the rod can be more favorably received by the support portion.

[Brief description of drawings]

FIG. 1 is a plan view of segments to be joined to each other, which illustrates a joint structure for segments according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a segment joining portion for explaining the segment joint structure according to the embodiment of the present invention.

FIG. 3 is a perspective view of a male segment having a male joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 4 is a perspective view of a female segment having a female joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 5 is a perspective view of a male joint and a female joint for explaining the segment joint structure according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a male joint and a female joint for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 7 is a perspective view of a bolt and a spacer for explaining the structure and shape of the spacer used in the joint structure of the segment according to the embodiment of the present invention.

FIG. 8 is a plan view of a spacer for explaining the structure and shape of the spacer used in the segment joint structure according to the embodiment of the present invention.

FIG. 9 is a cross-sectional view of a segment joining portion for explaining the segment joint structure according to the embodiment of the present invention.

FIG. 10 is a schematic side view of a joining portion for explaining the state of the bolt at the time of joining when the spacer used in the segment joint structure of the embodiment of the present invention is not attached to the bolt.

FIG. 11 is a perspective view of a bolt and a spacer explaining another example of the spacer used in the segment joint structure according to the embodiment of the present invention.

FIG. 12 is a plan view of a spacer for explaining another example of the spacer used in the joint structure for a segment according to the embodiment of the present invention.

[Explanation of symbols]

1 segment 1A male segment 1B female segment 2 joining surface 3 male joints 4 female joint 6 base plate 9 bolts (rod) 11 head (locking part) 12 Notch 13 Lock plate 22 Spacer 22b support

Front page continuation (72) Inventor Okayama recommended 12-12 Yurakucho, Chiyoda-ku, Tokyo Within Ishikawajima Kenzai Kogyo Co., Ltd. (72) Inventor Akihiko Nakano 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo In-house (72) Inventor Kenta Matsubara 2-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corp. Tokyo In-house (72) Inventor Toshio Kobayashi 4 of 1040 Hoshiyama, Fujinomiya-shi, Shizuoka Kobayashi Industry Co., Ltd. (56) References JP-A-8-246798 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (3)

(57) [Claims] 1. A joint structure of a segment in which the joining surfaces of the segments are slid to join the joining surfaces to each other, and a base plate and one of the joining surfaces are erected on the base plate. And a locking portion formed at the tip of the rod body and having a diameter larger than that of the rod body, and the rod body is provided on the other joint surface. A cutout portion that can be fitted from the side is formed, and while the rod body is slid and fitted into the cutout portion, by fitting the cutout portion between the locking portion of the rod body and the base plate, There is provided a female joint including a locking plate for locking the locking portion on the back surface side, and the rod body is provided with a spacer for ensuring a distance between the base plate and the locking portion. , Bending applied to the rod body on the side opposite to the fitting direction of the locking plate to the rod body Joint structure of a segment, wherein a support portion is provided for receiving the. 2. The spacer is formed by bending a metal plate having substantially the same width dimension as the thickness of the locking plate into an arc shape on one side and a rectangular shape on the other side. The segment joint structure according to claim 1, wherein the rod body is inserted into the arc-shaped portion, and the rectangular portion serves as the support portion. 3. The spacer comprises a metal block having a thickness substantially the same as the thickness of the locking plate, and a through hole into which the rod body can be inserted, the support being a metal block. The joint structure for a segment according to claim 1, wherein the joint structure comprises a solid portion of