JP2000141348A - Formwork for segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formwork for a segment by which the segment provided with a joint at a joining end face and having a smooth inner surface is easily produced. SOLUTION: In the formwork for a segment, a space is surrounded by a bottom plate forming the inner surface of the segment, side plates provided in both side parts of the bottom plate and end plates 24 provided in both end parts of the bottom plate. The space is made to a concrete placing space S. A female joint 3 is held on the end plate 24a of one hand of the formwork 21 and a male joint is held on the end plate of the other hand. A positioning part 34 is engaged with the notched part 7 of a retainment plate 6 of the female joint 3. The body 33 of a metallic material is provided on the rear side of the retainment plate 6 by engaging the positioning part 34 with the notched part 7 of the retainment plate 6. A stationary metallic material 31 consists of the positioning part 34 and the body 33 of the metallic material. A recessed part-forming metallic material 32 is provided in the side part of the stationary metallic material 31 and forms the recessed part in the side part of the female joint 3. Fitting bolts 37, 40 are screwed into the female screw parts 35, 38 of the stationary metallic material 31 and the recessed part-forming metallic material 32 through the hole parts 36, 39 formed in the end plate 24a. The stationary metallic material 31 and the recessed part-forming metallic material 32 are fixed to the end plate 24a. The female joint 3 is held on the end plate 24a by the fitting bolts 37, 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment formwork which is joined to each other to produce a segment for constructing a tunnel wall in a digging hole.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a so-called shield method is generally employed, in which a segment (mainly made of concrete or steel) is assembled on the inner surface side of an excavation hole to construct a cylindrical wall. As the segments used in the shield 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. When joining the segments by the bolts, a joint plate having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other is buried in the vicinity of the joint surface of the segments. In general, a bolt is inserted into a hole of the above, and a nut is fastened and joined to the bolt. Further, there is also a structure in which an insert fitting as a nut member is embedded in each segment, and bolts penetrating adjacent segments are fastened to each other for joining.

However, in the above structure, a bolt is inserted into a hole formed in a joint surface of a joint at a construction site,
It requires extremely complicated work of fastening nuts to these bolts and fastening bolts to insert fittings embedded in mutual segments, so there is a limit to shortening the assembly time, and adaptation to automatic assembly by robots is also required. It was difficult. Furthermore, even when the secondary lining is omitted, the bolt box formed on the segment must be closed in order to attach the bolts and nuts,
At present, it was urgent to develop a new joint structure in order to speed up construction and save labor.

[0004] Here, the present inventors have developed a segment that can be joined very easily and has a smooth inner surface. As shown in FIG. 8 and FIG.
Has a male joint 2 provided on one joint end surface 1a and a female joint 3 provided on the other joint end surface 1b. By joining the male joint 2 to the female joint 3, The joining end surfaces 1a and 1b are joined together.

More specifically, the joining end surfaces 1a and 1b are brought into contact with each other in a state where a bolt 5 constituting the male joint 2 is inserted into a concave portion 4 formed on a side portion of the female joint 3. The segments 1 are slid with each other at the male joint 2
Is inserted into the notch 7 of the locking plate 6 constituting the female joint 3, and the head 8 of the bolt 5 is inserted into the back side of the locking plate 6, so that the male joint 2 and the female joint 3 are separated. The segments 1 are joined together, so that the segments 1 are joined together.

The bolt 5 of the male joint 2 is connected to the joint end face 1
a is fastened and fixed to a cap nut 12 welded and fixed to the back surface side of the base plate 11 embedded in a. Male joint 2
The base plate 11 and the locking plate 6 of the female joint 3 have side plates 13
Anchor bars 14 are welded and fixed via the joints, and the anchor bars 14 are integrated with the concrete forming the segment 1.

[0007]

When manufacturing the segment 1 having the above-described joint structure, it is necessary to hold the male joint 2 and the female joint 3 on a mold. Here, in the case of the male joint 2, the cap nut 12 is removed with the bolt 5 removed.
The male joint 2 can be easily held on the mold frame by fastening the bolt from the side of the mold frame. However, in the case of the female joint 3, the female joint 3 is accurately molded because there is no screw portion. It is difficult to hold the segment 1 on the frame, and therefore, the segment 1 having this joining structure cannot be easily manufactured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a segment formwork capable of easily manufacturing a smooth inner surface segment having a joint at a joint end face. .

[0009]

According to a first aspect of the present invention, there is provided a segment formwork having a base plate, a bar body erected on the base plate, and one of the joining end faces.
A male joint having a locking portion having a larger diameter than the rod provided at the tip of the rod is provided, and a cutout portion is formed in the other joint end face to which the rod can be fitted from the side. By sliding the rod into the notch and fitting it into the notch, the rod is fitted between the locking portion of the rod and the base plate,
A segment formwork for manufacturing a segment provided with a female joint having a locking plate for locking the locking portion on the back side, a bottom plate forming an inner surface of the segment, and a bottom plate on both sides of the bottom plate. A side plate provided, and end plates provided at both ends of the bottom plate, a space surrounded by the bottom plate, the side plate and the end plate is a concrete casting space, and the female joint and the male joint are provided. Are respectively held by the end plates, and a positioning portion that fits into the notch portion of the locking plate, and the positioning portion is fitted into the notch portion of the locking plate, thereby forming the locking plate. A fixing hardware comprising a metal body disposed on the back side, and a recess forming metal which is disposed on a notch opening side of the locking plate of the fixing metal and forms a recess on a side portion of the female joint. Is passed through a hole formed in the end plate, and The screwed into the recess formed hardware the formed threaded hole, it is characterized in that said female fitting by a bolt for fixing each of these fixing hardware and recesses formed fittings on the end plate is held by the end plate.

That is, a fixing hardware in which the positioning portion is fitted into the notch of the locking plate of the female joint, and a recess forming metal provided on the side of the notch opening of the fixing hardware are connected to the hole of the end plate. The female joint is held on the end plate simply by fixing it to the end plate with bolts inserted into the end plate. Also, after the concrete poured into the concrete casting space has hardened, the bolts can be loosened, the recess-forming hardware can be removed, and the fixing hardware can be displaced and removed toward the recess formed by the recess-forming hardware. That is, the female joint having the locking plate formed with the cutout portion into which the rod body of the male joint is fitted can be easily held on the end plate, and at the time of demolding, the fixing hardware for holding the female joint is used. And the recess-forming metal can be easily removed, thereby making it extremely easy to manufacture a segment provided with a female joint having a locking plate formed with a cutout portion into which the rod of the male joint is fitted. Can be.

According to a second aspect of the present invention, there is provided the segment formwork according to the first aspect, wherein a connection piece disposed between the fixed metal part and the end plate is formed on the recess forming metal part. The connecting piece has a locking projection protruding toward the fixing hardware, and the fixing hardware has an engaging projection protruding toward the connecting piece and engaging with the locking protrusion. It is characterized by having.

In other words, the engaging projections formed on the fixing piece and the engaging projections of the connecting piece formed on the recess forming metal are engaged with each other, so that the recess forming metal and the fixing metal are positioned with respect to each other. Thus, the female joint is held by the end plate in a state where the female joint is securely positioned by the fixing hardware.

According to a third aspect of the present invention, there is provided the segment formwork according to the first or second aspect.
A positioning projection is formed on the end plate so that a side portion of the locking plate of the female joint is in contact with the female joint, and the positioning joint positions the female joint held by the end plate.

That is, the positioning joint formed on the end plate is brought into contact with the side of the locking plate of the female joint held by the end plate, thereby positioning the female joint on the end plate with extremely high precision. Is kept in the state.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a segment formwork of the present invention will be described below with reference to the drawings. The same components as those of the conventional technology are denoted by the same reference numerals, and description thereof is omitted.
In FIGS. 1 and 2, reference numeral 21 denotes a segment formwork. The formwork 21 includes a bottom plate 22 that forms the inner peripheral surface of the segment 1, arc-shaped side plates 23 provided on both sides of the bottom plate 22, and an end plate 24 that connects both ends of the side plates 23. Have been.

The space formed by the bottom plate 22, the side plates 23 and the end plates 24 is a concrete casting space S, and the concrete casting space S conforms to the shape of an arc plate to be formed. ing. The side plate 23 and the end plate 24 each have a surface on the side of the concrete placing space S perpendicular to the bottom plate 22.
Are movable in directions away from each other.

Then, concrete is poured into the concrete placing space S of the formwork 21 so that the bottom plate 2 is formed.
2, an inner peripheral surface is formed, and the side plate 23 and the end plate 24 are used to manufacture the segment 1 in which each joint end surface is formed. The female joint 3 is held on one end plate 24a of the end plates 24 constituting the formwork 21, and the male joint 2 is held on the other end plate 24b.

Next, the holding structure of the female joint 3 and the male joint 2 to the end plate 24 will be described. (Holding Structure of Female Joint) As shown in FIGS. 3 to 5, the female joint 3 is attached to one end plate 24a. The female joint 3 is attached and held to the end plate 24 a by a fixing hardware 31, and a recess forming metal 32 is attached to a side portion of the fixing hardware 31. The fixed metal parts 31 and the concave part forming metal parts 32 are in contact with each other at end faces facing each other.

The fixing metal member 31 has a metal body 33 disposed on the back side of the locking plate 6 of the female joint 3 and a notch 7 formed integrally with the metal body 33 and formed on the locking plate 6. And a positioning portion 34 that can be fitted into the device. This fixed hardware 3
1, a female screw portion 35 is formed, and a mounting bolt 37 inserted into a hole 36 formed in the end plate 24a is screwed into the female screw portion 35.

The recess forming metal part 32 is provided on the side of the female joint 3.
It is provided for forming the concave portion 4, and is provided with the fixing hardware 3.
Similarly to 1, a female screw portion 38 is formed, and a mounting bolt 40 inserted into a hole 39 formed in the end plate 24a is screwed into the female screw portion 38. A connection piece 41 is formed in the recess forming metal piece 32 at an end of the fixed metal piece 31 on the end plate 24a side, and the connection piece 41 enters between the end plate 24a and the fixed metal piece 31. It is arranged at a position.

The connecting piece 41 is formed with a locking projection 42 projecting toward the fixing hardware 31. In addition, an engagement protrusion 43 is formed on the fixing hardware 31 on the end plate 24a side so as to engage with the engagement protrusion 42. The engaging projections 42 and the engagement projections 43 each have a surface that meshes with a tapered surface. A positioning protrusion 44 is formed on the end plate 24a.
Thereby, the locking plate 6 of the female joint 3 is positioned on the end plate 24a.

Next, the female joint 3 is connected to the end plate 24 of the formwork 21.
The case in which the data is held in a will be described. First, the end plate 24
The recess forming metal part 32 is temporarily fixed to the part a by the mounting bolt 40. Next, the female joint 3 is disposed at a position where the end plate 24a is mounted. That is, the positioning protrusions 44 on the end plate 24a
The locking plate 6 is brought into contact with the end plate 24a in a state where the end of the locking plate 6 of the female joint 3 is brought into contact with the end plate 24a.

In this state, the metal body 33 of the fixed metal piece 31 is moved toward the rear surface of the locking plate 6 of the female joint 3 while the positioning part 34 is fitted in the notch 7 of the locking plate 6 of the female joint 3. Let it be placed. Then, the female thread portion 35 of the fixing hardware 31
Then, the mounting bolt 37 inserted into the hole 36 of the end plate 24a is screwed.

In this way, the engaging projections 43 of the fixing hardware 31 and the locking projections 42 of the recess forming hardware 32 engage with each other, so that the fixing hardware 31 and the recess forming hardware 32 are fixed at predetermined positions. Thus, the female joint 3 is attached to the end plate in a state where it is positioned at a predetermined position. Thereafter, the mounting bolts 40 are completely screwed in, and the recess forming metal parts 32 are fixed to the end plate 24a.

(Holding Structure of Male Joint) As shown in FIGS. 6 and 7, when forming the segment 1, the male joint 2 with the bolt 5 for engagement with the female joint 3 removed is attached to the end plate 24b. Attach. A mounting hole 51 is formed in the end plate 24b, and a mounting bolt 52 is inserted into the hole 51 and screwed into the cap nut 12 of the male joint 2, whereby the male joint 2 is connected to the end plate 24b. It is attached.

Reference numeral 53 denotes an end plate 24b of the male joint 2.
The positioning protrusion 53 is provided on the rotation direction side when the mounting bolt 52 is screwed in.

Next, a case where the segment 1 is manufactured by the segment manufacturing mold 21 will be described. First, as described above, the respective end plates 24a, 24b
Then, when the female joint 3 and the male joint 2 are respectively held, a reinforcing bar is arranged in the concrete casting space S of the formwork 21 and concrete is cast.

Thereafter, when the concrete has hardened, the mounting bolts 37, 40 and 52 are loosened and removed, and the side plate 23 is separated. In this state, the segment 1 is lifted upward from the mold 21 and removed from the mold. From the joint end face 1 b of the segment 1, the concave forming metal 32 arranged on the side of the female joint 3 is removed from the joint end face of the segment 1. Remove by pulling perpendicular to 1b. Thereafter, the fixing hardware 31 is replaced with the recess 4 formed by the recess forming metal 32.
The female joint 3 is displaced from the locking plate 6 and taken out.

In this manner, the male joint 2 is provided at a predetermined position on one of the joint end faces 1a, and the other joint end face 1b
The segment 1 provided with the female joint 3 at a predetermined position is formed. When the tubular wall is constructed by joining the segments 1 to each other, the bolt 5 is screwed into the cap nut 12 of the male joint 2 provided on one joint end face 1a.

As described above, according to the segment formwork 21, the fixing hardware 31 in which the positioning portion 34 is fitted into the notch 7 of the locking plate 6 of the female joint 3, and the fixing hardware 3
1 and the recess-forming metal member 32 arranged on the side of the end plate 24.
The female joint 3 can be held on the end plate 24a with high precision simply by fixing it to the end plate 24a by the mounting bolts 37, 40 inserted into the holes 36, 39 formed in the end plate 24a. .

After the concrete poured into the concrete placing space S has hardened, the mounting bolt 3
The recesses 7 and 40 can be loosened to remove the recess-forming hardware 32, and the fixing hardware 31 can be displaced toward the recess 4 formed by the recess-forming hardware 32 and removed.

That is, the female joint 3 having the locking plate 6 in which the notch 7 into which the bolt 5 of the male joint 2 is fitted can be easily held on the end plate 24a. The fixing hardware 31 and the recess forming hardware 32 holding the female joint 3 can be easily removed, thereby having the locking plate 6 in which the notch 7 into which the bolt 5 of the male joint 2 is fitted is formed. The segment 1 provided with the female joint 3 can be manufactured very easily.

The engagement projections 42 of the connecting piece 41 formed on the recessed metal part 32 and the engagement projections 43 formed on the fixed metal part 31 are engaged with each other, so that they are fixed to the recessed metal part 32. The hardware 31 is positioned with respect to each other,
Thereby, the female joint 3 can be held by the end plate 24a in a state where the female joint 3 is securely positioned by the fixing hardware 31.

Further, the positioning joint 44 formed on the end plate 24a is brought into contact with the side of the locking plate 6 of the female joint 3 held by the end plate 24a, so that the female joint 3 is extremely high. It can be held in a state of being positioned on the end plate 24a with high accuracy.

[0035]

As described above, according to the segment formwork of the present invention, the following effects can be obtained.
According to the segment formwork of the first aspect, the fixing hardware having the positioning portion fitted into the notch of the locking plate of the female joint, and the recess forming metal disposed on the opening side of the notch in the fixing hardware. The female joint can be held on the end plate very easily only by fixing them to the end plate with bolts inserted into the holes of the end plate. Also, after the concrete poured into the concrete casting space has hardened, the bolts can be loosened, the recess-forming hardware can be removed, and the fixing hardware can be displaced and removed toward the recess formed by the recess-forming hardware. That is, the female joint having the locking plate formed with the cutout portion into which the rod body of the male joint is fitted can be easily held on the end plate, and at the time of removal from the mold, the fixing hardware for holding the female joint. And the recess-forming metal can be easily removed, thereby making it extremely easy to manufacture a segment provided with a female joint having a locking plate formed with a cutout portion into which the rod of the male joint is fitted. Can be.

According to the second aspect of the present invention, the engaging projection of the connecting piece formed on the recess-forming metal and the engaging projection formed on the fixing metal are engaged with each other. The recess forming hardware and the fixing metal are positioned with respect to each other, whereby the female joint can be held on the end plate in a state where the female joint is securely positioned by the fixing metal.

According to the third aspect of the present invention, the positioning projection formed on the end plate is brought into contact with the side of the locking plate of the female joint held by the end plate, whereby the female member is formed. The joint can be held in a state of being positioned on the end plate with extremely high precision.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mold for explaining the configuration and structure of a segment mold according to an embodiment of the present invention.

FIG. 2 is a plan view of the mold for explaining the configuration and structure of the segment mold according to the embodiment of the present invention.

FIG. 3 is a front view of a holding portion of the female joint for explaining a holding structure of the female joint to the end plate of the segment formwork according to the embodiment of the present invention.

FIG. 4 is a view AA in FIG. 3 illustrating a structure for holding the female joint to the end plate of the segment formwork according to the embodiment of the present invention;
It is sectional drawing.

FIG. 5 is a view BB in FIG. 3 illustrating a structure for holding the female joint to the end plate of the segment formwork according to the embodiment of the present invention.
It is sectional drawing.

FIG. 6 is a front view of a holding portion of the male joint for explaining a structure for holding the male joint to the end plate of the segment formwork according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a structure for holding the male joint to the end plate of the segment formwork according to the embodiment of the present invention.
It is sectional drawing.

FIG. 8 is a cross-sectional view of a joint portion of the segment for explaining the configuration and structure of a female joint and a male joint provided on the segment.

FIG. 9 is a perspective view of the female joint and the male joint for explaining the configuration and structure of the female joint and the male joint provided in the segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 1a, 1b Joining end surface 2 Male joint 3 Female joint 4 Concave part 5 Bolt (rod body) 6 Locking plate 7 Notch 8 Head (locking part) 11 Base plate 21 Segment form 22 Bottom plate 23 Side plate 24, 24a , 24b end plate 31 fixing hardware 32 recess forming hardware 33 hardware main body 34 positioning part 35, 38 female thread part (screw hole) 37, 40 mounting bolt (bolt) 41 connecting piece 42 locking projection 43 engagement projection 44 positioning projection S Concrete casting space

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Atsushi Kagawa 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Co., Ltd. Obayashi Corporation Tokyo Head Office (72) Inventor Hiroki Someya 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Building Materials Co., Ltd.

Claims (3)

[Claims] 1. One of the joining end faces has a base plate, a rod erected on the base plate, and a locking portion having a larger diameter than a rod provided at a tip end of the rod. A male joint is provided, and a cutout portion is formed on the other joint end surface so that the rod body can be fitted from the side, and the rod body is slid into the cutout portion while engaging the rod body. A segment formwork for manufacturing a segment provided with a female joint having a locking plate that locks the locking portion on the back side by being fitted between a locking portion and the base plate, A bottom plate forming the inner surface of the segment, side plates provided on both sides of the bottom plate, and end plates provided at both ends of the bottom plate, and a space surrounded by these bottom plates, the side plates, and the end plates , A concrete casting space, wherein the female joint and the male joint are each the end plate It is held, and a positioning portion to be fitted in the notch of the locking plate, by fitting the positioning portion to the notch of the locking plate,
A fixing hardware comprising a metal body disposed on the back surface side of the locking plate, and a recess formed in a side portion of the female joint, the fixing metal being disposed on a notch opening side of the locking plate; To be formed, and through a hole formed in the end plate, and screwed into a screw hole formed in the fixing metal and the recess forming metal, and these fixing metal and the recess forming metal are inserted into the end plate. The mold for a segment, wherein the female joint is held on the end plate by bolts to be fixed. 2. The recess-forming metal body has a connecting piece provided between the fixing metal piece and the end plate, and the connecting piece has a locking projection protruding toward the fixing metal piece. 2. The mold for a segment according to claim 1, wherein an engagement protrusion is formed on the fixing hardware, the engagement protrusion protruding toward the connection side and engaging with the locking protrusion. 3. The end plate is provided with a positioning projection on which a side portion of the locking plate of the female joint abuts, and the female joint held on the end plate is positioned by the positioning projection. The segment formwork according to claim 1 or 2, wherein: