JPH1080914A - Form for manufacturing segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a through hole for connecting at a segment without using a sheath tube. SOLUTION: Since taper pins 7, 8, 10, 11 are clamped at side plates 2, 3 or end plates 4, 5 by clamping threaded parts 7c, 8c, 10c, 11c of base ends at a nut 13 and recesses 8b, 11b are engaged with protruding parts 7a, 10a of ends, a predetermined state is not collapsed in the case of placing concrete C. After the placed concrete C is solidified, the parts 7c, 8c, 10c, 11c of the pins 7, 8, 10, 11 are loosened, the pins are externally drawn from side plates 2, 3 or end plates 4, 5, the side plates 2, 3 and the end plates 4, 5 are separately moved, and obtained segment S is released. Tapered through holes Sh, Si gradually reduced in diameter from both ends toward centers are formed by drawing the pins 7, 8, 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork for manufacturing a concrete segment used for constructing a tunnel-like wall or the like.

[0002]

2. Description of the Related Art One of the methods for constructing a tunnel is to perform excavation and segment assembly simultaneously.
There is a so-called cider method. Conventionally, a hexagonal segment S shown in FIG. 5 is known as a concrete segment used in such a shield method.

[0003] The hexagonal segments S are formed at both ends of straight side joining surfaces Sa and Sb parallel to each other with inclined joining surfaces S and Sb.
c and Sd are protruded in a horn shape and are connected in series.
It is curved in an arc shape in a side view with the side joining surfaces Sa and Sb facing the front, and between the side joining surfaces Sa and Sb, and one side joining surface Sa and one inclined joining surface Sd facing the one.
The through-holes Se and Sf for joining are formed by the sheath tubes 21 and 22, respectively, and a screw hole Sg is formed on the other inclined joining surface Sc by an insert nut.

In order to connect a plurality of the hexagonal segments S in the longitudinal direction to form a ring shape, one inclined joining surface Sc, Sd of each of the two hexagonal segments S, S abuts each other, and one of the hexagonal segments S, S is brought into contact with each other. The hexagonal segments S are joined together by inserting the joining bolts 23 into the through holes Sf of the hexagonal segment S and screwing them into the screw holes Sg of the other hexagonal segment S. , 2
This is performed by abutting the side joining surfaces Sa, Sb of the hexagonal segments S, S with each other, inserting a joining bolt 24 into the through holes Se, Se, and screwing them together. In the case of tunnel lining, the right side is the wellhead side and the left side is the face side in FIG.

[0005] A conventional formwork provided for the production of this hexagonal segment has a bottom plate, and a pair of side plates and end plates forming a concrete casting space on the bottom plate. A through hole S is provided between the side plates and between the side plate and the end plate.
e and Sf are formed such that sheath tubes 21 and 22 are formed.

[0006]

The inner dimensions of the pair of side plates to which the sheath tubes 21 and 22 are attached and the inner dimensions of the side plates and the end plates are not always constant. Since the distance slightly changes due to a separation movement or a change in the outside air temperature, the length of the sheath tube must be adjusted one by one at the time of installation, which is troublesome.

Also, the sheath tubes 21 and 22 are expensive,
In addition, there is a problem that holes are easily bent at the time of placing concrete.

One object of the present invention is to provide good workability,
An object of the present invention is to provide a mold for manufacturing a segment which is less likely to bend.

Another object of the present invention is to provide a mold for manufacturing a segment which can reduce the cost of the segment.

[0010] Another object of the present invention is to provide a segment manufacturing formwork capable of manufacturing segments which can be easily joined by joining bolts.

[0011]

In order to achieve at least one of the above-mentioned objects, a mold for manufacturing a segment according to the present invention comprises a bottom plate and a plurality of enclosure plates forming a concrete casting space on the bottom plate. And a taper pin having a tapered shape that forms a through-hole in concrete cast in the concrete casting space, on the inner surface of the facing plate facing each other, Were linearly matched, and their ends were detachably connected and attached.

It is preferable that the tapered pin can be pulled out of the enclosure. A pair of taper pins can be connected by fitting a protrusion formed at the tip of one taper pin with a recess formed at the tip of the other taper pin.
Alternatively, a pair of tapered pins may be connected by individually and individually fitting the ends of the connecting pipes to both ends of the connecting pipe.

[0013] In the case of a mold for hexagonal segments, a pair of enclosing plates are used as side plates forming side joining surfaces of the segments, and the other pair of enclosing plates are formed as end portions forming inclined joining surfaces of the segments. Board.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. 1 and 2 show one embodiment of a mold for manufacturing a segment according to the present invention. The formwork for manufacturing a segment in this embodiment is a formwork for the hexagonal segment S in FIG. 5, and includes a bottom plate 1, a pair of side plates 2, 3 and an end plate 4,
5 and the subject.

The bottom plate 1 forms the inner peripheral surface of the hexagonal segment S and is fixed on a base (not shown). The side plates 2 and 3 form side joining surfaces Sa and Sb of the hexagonal segment S, and the end plates 4 and 5 form inclined joining surfaces Sc and Sd of the hexagonal segment S. As a result, a concrete casting space K is formed on the bottom plate 1.

The side plates 2, 3 and the end plates 4, 5 are movably attached to the base by human power or mechanical power.
After the concrete C placed in the concrete placing space K is solidified, the side plates 2 and 3 are moved left and right and the end plates 4 and 5 are moved up and down in FIG. 1 to remove the hexagonal segment S as a product. It can be typed. Since this structure is well known and has no direct relation to the present invention, further description is omitted.

A pair of tapered pins 7, 7, 8, 8 are attached to two positions of the side plates 2, 3 facing each other, and taper pins 10, 11 are provided at positions of the side plate 2 and the end plates 4, 5 facing each other. Is attached. Each of the tapered pins 7, 8, 10, 11 is formed in a tapered shape with a circular cross section. One of the tapered pins 7, 10 has a projection 7 a, 10 a, and the other has a tapered pin 8, 11. Recesses 8b and 11b are provided respectively. The tapered pins 7 and 10 have recesses, and the other tapered pins 8 and
A protrusion may be provided on 11.

Each pair of tapered pins 7, 8, 10, 11
The through-holes Sh and Si corresponding to the through-holes Se and Sf in FIG. 5 are formed.
The projections 7a, 10a of one of the tapered pins 7, 10 are connected to the recessed portions 8b, 11b of the other tapered pins 8, 11 in a separable manner. Taper pins 7, 8, 10, 1
The taper angle of 1 is preferably 1 to 2 degrees, but may be slightly larger or smaller.

Each of the tapered pins 7, 8, 10, 11 is aligned with a through hole 2a, 3a, 4a, 5a formed in the outer surface of the side plate 2, 3 or the end plate 4, 5 by welding means or the like. Nuts 7c, 8c, 10 at the base end
c, 11c are attached by screwing. Therefore, even when the inner dimensions of the side plates 2 and 3 and the inner dimensions of the side plates 2 and the end plates 4 and 5 are changed, the screwing depth of the threaded portions 7c, 8c, 10c and 11c with respect to the nut 13 is adjusted. Can be dealt with easily. Taper pins 7, 8,
10 and 11 can be pulled out to the outside (left side in FIG. 2) of the side plates 2 and 3 or the end plates 4 and 5.

Next, the operation of the above-configured mold for manufacturing segments will be described together with the method of use. FIG. 1 shows a concrete placing space K by side plates 2 and 3 and end plates 4 and 5.
And a preparation state in which the tapered pins 7, 8, 10, and 11 are attached at predetermined positions, and in this state, the concrete C is poured into the concrete placing space K in the same manner as in the related art.

Each of the tapered pins 7, 8, 10, 11 is fixed to the side plates 2, 3 or the end plates 4, 5 by screwing the base screw portions 7c, 8c, 10c, 11c to the nut 13. Since the concave portions 8b and 11b are fitted to the protruding portions 7a and 10a at the tips, a predetermined state is not broken when the concrete C is cast.

When the cast concrete C is solidified, the threaded portions 7c, 8c, 10 of the respective tapered pins 7, 8, 10, 11
Loosen the c, 11c and pull out the taper pin from the side plates 2, 3 or the end plates 4, 5, move the side plates 2, 3 and the end plates 4, 5 away from each other to remove the hexagonal segment S obtained above. I do. By pulling out the taper pins 7, 8, 10, 11
Tapered through-holes Sh and Si whose diameters are gradually reduced as they approach the center from both ends are formed. Since the tapered pins 7 and 8 are removed before the side plates 2 and 3 move apart, the distance between the side plates 2 and 3 can be reduced to the minimum distance required for demolding.

Since the through holes Sh and Si have a small diameter at the central portion as described above, the joining bolts 23 and 24 (FIG. 5) are inserted therethrough and screwed into other joining bolts and screw holes. At this time, the central small diameter portion can be swung about a fulcrum to quickly align with the screw hole and smoothly screw the screw hole.

The operation procedure is not limited to the above. For example, the tapered pins 7 and 8 of the side plates 2 and 3 are
After being moved away from the side plates 2 and 3 together, the side plates 2 and 3 may be pulled out. If necessary, a release agent such as oil is applied to the surface of the taper pins 7, 8, 10, and 11 to facilitate pulling out of the concrete C.

FIG. 3 shows another embodiment of the mold for manufacturing segments according to the present invention. In this embodiment, the tapered pins 7, 8,
The projections 10 and 11 do not have the protrusions 7a and 10a or the recesses 8b and 11b, and are connected to each other by fitting their tips to both ends of the connection pipe 15 in a separable manner. The side plate and the end plate, and the mounting structure of the tapered pins 7, 8, 10, 11 to them are the same as those of the formwork of FIGS.

In the mold for manufacturing a segment of this embodiment, the elastic seal ring 16 fitted to the joint bolts 23, 24 to make the space between the joint bolts 23, 24 and the through holes Sh, Si liquid-tight is provided. If necessary, it can be stopped in the connecting pipe 15 in advance.

The present invention is not limited to hexagonal segment molds, but can be applied to other shapes such as quadrangular segments. The width of the through holes Sh and Si portions of the segment is relatively narrow, or the surrounding plates (side plates, end plates)
In the case where 3, 4 and 5 can be largely moved apart, as shown in FIG. 4, the threaded portions 7c, 8c, 10c,
The taper pins 7, 8, 10, 11 which are thin and cannot be pulled out of the enclosures 2, 3, 4, 5 are fixed to the enclosure with nuts 17, and the taper pins 7, 8, 10, 11
The tapered pins 7, 8, 10, and 11 can be pulled out of the cast concrete C by moving the surrounding plates 2, 3, 4, and 5 apart from each other.

[0028]

As described above, the segment-producing formwork according to the present invention is a segment-producing formwork having a bottom plate and a plurality of surrounding plates forming a concrete casting space on the bottom plate. There, on the inner surface of the above-mentioned surrounding plate facing each other,
A tapered tapered pin that forms a through hole in the concrete cast in the concrete casting space has a configuration in which the center axes of the tapered pins are aligned with each other in a straight line, and the tips of the pins are detachably connected to each other. Therefore, unlike the conventional frame for manufacturing a segment, a sheath tube is not required. Therefore, there is an advantage that the cost is reduced by that much, the workability is improved without labor such as adjusting the length of the sheath tube, and the hole is hardly bent.

When the tapered pin can be pulled out of the surrounding plate, the distance of the separating movement of the surrounding plate can be suppressed to the minimum necessary for demolding.

If a pair of taper pins are connected by fitting a protrusion formed at the tip of one taper pin with a recess formed at the tip of the other taper pin, the connection between the pair of taper pins is strengthened. Hole bending can be more reliably prevented.

In the case where a pair of tapered pins are connected to each other so that their respective tips are detachably fitted to both ends of the connecting pipe and connected to each other, a seal ring for making the space between the joining bolt and the through hole liquid-tight. Can be previously attached to the connecting pipe as needed, and the joining operation of the segments becomes easy.

In the case where one pair of enclosure plates is a side plate forming a side joining surface of a hexagonal segment, and the other pair of enclosure plates is an end plate forming an inclined joining surface of a hexagonal segment, The square segments can be manufactured without hindrance.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a segment manufacturing formwork according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a mounting structure of a tapered pin to an enclosure.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a partially broken front view showing a joined state of hexagonal segments.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bottom plate 2, 3 side plate (enclosure plate) 4, 5 end plate (enclosure plate) 7 taper pin 7 a protrusion 7 c screw portion 8 taper pin 8 b recess 8 c screw portion 10 taper pin 10 a protrusion 10 c screw portion 11 taper pin 11 b recess 11 c screw portion 13 Nut 15 Connecting pipe C Concrete K Concrete placing space S Segment Sh Through hole Si Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Shiraishi, Inventor Koji Shiraishi 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Japan Okumura Gumi Co., Ltd. (72) Inventor Hiroki Someya 2-6-12, Yaesu, Chuo-ku, Tokyo (72) Inventor Akio Hashiguchi 2-6-21, Yaesu, Chuo-ku, Tokyo Inside Ishikawajima Construction Materials Industry Co., Ltd.

Claims (5)

[Claims] 1. A mold for manufacturing a segment comprising a bottom plate and a plurality of surrounding plates forming a concrete casting space on the bottom plate, wherein the concrete casting is performed on inner surfaces of the surrounding plates facing each other. Segment manufacturing characterized in that a tapered tapered pin that forms a through hole in concrete cast in a space is attached by aligning the center axes of each other in a straight line and connecting their tips so that they can be separated. Formwork. 2. The mold for manufacturing a segment according to claim 1, wherein the tapered pin is capable of being pulled out of the surrounding plate. 3. The pair of taper pins are connected by fitting a protrusion formed at the tip of one taper pin with a recess formed at the tip of the other taper pin. The described mold for manufacturing a segment. 4. The mold frame for manufacturing a segment according to claim 1, wherein the pair of tapered pins are connected such that their respective tips are individually fitted into both ends of the connecting pipe in a separable manner. 5. A pair of surrounding plates are side plates forming a side joining surface of a hexagonal segment, and the other pair of surrounding plates are:
The mold for manufacturing a segment according to claim 1, 2, 3, or 4, wherein the end plate forms an inclined joining surface of the hexagonal segment.