JPH06246725A - Method and form for producing segment - Google Patents

Abstract

PURPOSE:To produce a segment having high commodity value by forming a total of six surfaces of respective end surfaces and inner and outer circular arc surfaces in axial and peripheral directions as dense and beautiful finished surfaces having predetermined dimensions. CONSTITUTION:A form 4 having a concrete pouring port 8 formed to the upper part thereof is provided on a base 1 and a concrete supplying opening part 21 is formed to the frame plate 13 on the circular outer surface side of the form 4 and lid members 17, 23 closing the concrete pouring port 8 and the opening part 21 are provided and, further, a form revolving means 19 revolving the frame plate 13 of the form 4 so as to turn the same upwardly is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a concrete segment for molding a cylinder, which is divided into a plurality of pieces in the circumferential direction and the axial direction, and a frame device for manufacturing the segment for manufacturing the segment. .

[0002]

2. Description of the Related Art The above-mentioned segment is formed by joining a large number of holes in the circumferential direction and the axial direction of a drilling hole formed by a shield construction method to form a tubular body which serves as a body of a tunnel. In the axial direction is performed, for example, by pressing the newly installed segment against the already installed segment in a back-pressed state.

If the finish accuracy of the end faces of the segments that are added in the axial direction is poor, the end faces of the segments will be in a state of one-sided contact with each other, which may lead to a situation where cracks occur when pressure is applied and sometimes collapse. Therefore, it goes without saying that the finishing accuracy of the end face in the circumferential direction is also required to be high, but the finishing accuracy of the end face in the axial direction is required to be higher than that.

By the way, conventionally, an arc-shaped formwork having a portion corresponding to one end side in the axial direction of the segment as a concrete inlet is placed vertically, and a predetermined amount of concrete is poured through the inlet on the upper side, and A manufacturing method in which the injection port is closed by a lid, or a mold in which a portion corresponding to the arc outer surface side of the segment is opened, and the frame plate on the arc inner surface side is placed horizontally so as to be laid down, Prepare a lid for closing the opening divided into a plurality in the circumferential direction, and inject concrete into the formwork through the opening, and close the opening with the split lid leaving the central portion in the circumferential direction, Finally, a manufacturing method is adopted in which the concrete in the opening portion of the central portion is acclimated with a trowel trowel, and the central opening portion is closed by the split lid.

According to the former manufacturing method, the weight of concrete is vertically applied to the bottom surface of the mold and the vibration is applied to the mold device, so that the concrete poured into the mold has a low slump. However, since it fits closely to the inner surface of the mold, a total of five surfaces including the end surface on the other end side in the axial direction of the segment, the end surfaces on both sides in the circumferential direction, and the inner and outer circular arc surfaces become a predetermined finished surface.

[0006]

However, no matter how strictly the injection amount of concrete into the formwork is controlled, the injection amount of concrete is too short or too short to say absolutely. If the amount of concrete injected into the formwork is large even a little, the concrete injection port is not completely closed by the lid, and thus the end face on the one end side in the axial direction is inclined with respect to the axis of the segment, or The dimension between the end faces in the axial direction may differ in an unspecified manner, which may cause the segment to crack or collapse when the segments are added. Conversely, if the amount of concrete injected into the formwork is small, there will be voids on the lid side. There was a very serious defect in that a slight excess or deficiency of concrete diminished the commercial value of the segment.

On the other hand, according to the latter manufacturing method, the four end faces in the axial direction and the circumferential direction, which are most important for the segment, and the inner surface of the arc can be beautifully finished. Since it was dispersed in the frame plate, it was not dense enough to vibrate. Furthermore, the outer surface of the arc to be finally ironed will inevitably be distorted, and there is no problem in strength, but the strength of the product itself is insufficient due to the poor finish in appearance. There was a problem in that it was easy to give anxiety and impaired product value.

The present invention has been devised in view of such circumstances, and by rational and peculiar means, a total of six faces of the end faces in the axial direction and the circumferential direction and the inner and outer arc faces are fine and clean. In addition, it is an object of the present invention to provide a method for manufacturing a segment having a high commercial value that can be finished to a predetermined size, and a mold device for manufacturing a segment suitable for carrying out the method.

[0009]

In the method for manufacturing a segment according to the first aspect of the present invention, a predetermined amount of concrete is placed in an arc-shaped formwork that is opened upward as a concrete inlet at a portion corresponding to one end side in the axial direction of the segment. And the concrete inlet is closed with a lid, and the formwork is rotated with the frame plate on the arc outer surface side facing upwards, and the vicinity of the injection port formed on the frame plate on the outer surface side. Concrete is replenished in the formwork through the opening, and the opening is closed by a lid, and the segment is released from the mold after the concrete is solidified.

In the segment manufacturing mold device of the second invention, an arc-shaped mold having a portion corresponding to one end side in the axial direction of the segment as a concrete inlet is used as a base with the inlet facing upward. Along with the provision, forming an opening for concrete replenishment in the vicinity of the inlet to the frame plate on the arc outer surface side of the mold, and providing a lid for closing the inlet and the opening, and A structural feature is that the mold is provided with a mold rotating means for rotating the frame plate on the arc outer surface side of the mold toward the back.

[0011]

According to the method of manufacturing a segment according to the first aspect of the present invention, concrete is poured into a vertically placed formwork, so that the five surfaces excluding the end surface on one end side in the axial direction of the segment have a fine and beautiful finished surface. Become. On the other hand, with respect to the end face on the one end side in the axial direction, that is, the end face on the concrete inlet side that is closed by the lid, the amount of concrete required for producing the predetermined segment is greater than the amount of concrete required to produce a void in the part. Slightly injecting concrete into the formwork, completely closing the concrete injection port with the lid, rotating the formwork, and replenishing the concrete from the opening near the concrete injection port. Then, by closing the opening later, the end surface of the segment on the one end side in the axial direction becomes a fine and beautiful finished surface.

According to the second aspect of the present invention, there is provided a frame apparatus for producing a segment, in which the five frames of the segment are vertically placed with the above five surfaces as a precise and beautiful finished surface, and the concrete inlet side. It is possible to switch to the horizontal state where the concrete can be replenished surely, so that it is suitable to manufacture the segment according to the first aspect of the present invention in which the six sides have a fine and beautiful finished surface of a predetermined dimension. Be implemented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a formwork apparatus for manufacturing a concrete segment. Reference numeral 1 in the figure denotes a fixed base made of a combination of shape steels, which is fixed on the foundation concrete. As shown in FIG. 3, a movable base 3 is pivotally mounted on the fixed base 1 via a horizontal shaft 2. Reference numeral 4 denotes an assembly mold for manufacturing the segment, which is provided on the movable base 3.

As shown in FIG. 6, the segment 5 molded by the above-mentioned assembly form 4 has a partial arc shape, and both corners of the end faces 6 and 7 on both axial ends are sloped parts a. A groove b for loading the sealing material is formed in the middle portion of the end faces 6 and 7 in the thickness direction. For example, a large number of joints are formed in the circumferential direction and the axial direction of the drilling hole formed by the shield method. To form a cylinder that will be the body of the tunnel.

As shown in FIG. 2, the assembly mold 4 for manufacturing the segment is provided with a portion corresponding to the end face 6 on one end side in the axial direction of the segment 5 as a concrete inlet 8. More specifically, A bottom frame plate 9 on which a convex portion c having a shape corresponding to the end surface 7 of the segment 5 on the other axial side is formed.
And frame plates 12 and 13 corresponding to the inner and outer arc surfaces 10 and 11 of the segment 5 having different radii of curvature by thickness dimensions, and side frame plates 15 and 15 corresponding to the end faces 14 and 14 on both sides in the circumferential direction of the segment 5. And a triangular corner member d that forms the slope portion a of the end faces 6 and 7 of the segment 5 is provided on the frame plates 12 and 13, and the bottom frame plate 9 and the frame plate on the arc inner surface side are included therein. And 12 are fixedly provided to the movable base 3.

With respect to the bottom frame plate 9 and the frame plate 12 on the arc inner surface side, the frame plate 13 on the arc outer surface side and the side frame plate 1 are arranged.
5, 15 and 15 are connected to each other by a bolt and a nut so that they can be disassembled by a flange, and the frame plate 13 on the arc outer surface side
The side frame plates 15 and 15 are flange-connected to each other by bolts and nuts so that they can be disassembled from each other.

Reference numeral 16 denotes a top plate continuously provided on the upper end portion of the frame plate 12 on the inner surface side of the arc, and 17 denotes a lid body for forming an end face for releasably closing the concrete inlet 8 opened upward of the assembly formwork 4. In addition, a convex portion e having a shape corresponding to the end surface 6 of the segment 5 on the one end side in the axial direction of the segment 5 is formed on the lower surface portion of the lid body 17 in a state where the injection port 8 is closed. The lid 17 is configured to be closed and fixed to the frame plate 13, the side frame plates 15 and 15 and the top plate 16 by bolts and nuts.

Numeral 19 designates a form rotating means which is connected to the movable base 3 and comprises, for example, a hydraulic cylinder. The movable base 3 and the assembled form 4 are rotated around the horizontal axis 2 and the concrete pouring port 8 thereof is directed upward. Vertical state with opening to X
And the horizontal state Y in which the frame plate 13 on the arc outer surface side thereof is placed on the back, and the driving is switched. In the figure, 18 is a pit formed in the basic concrete for installing the form rotating means 19, and 20 is a supporting member for supporting the form 4 in the horizontally placed state Y.

Reference numeral 21 denotes an opening for replenishing concrete, which opens upward when the formwork 4 is switched to the horizontal state Y.
Reference numeral 2 is an air vent hole that opens upward when the mold 4 is also switched to the horizontally placed state Y, and is opened in the vicinity of the injection port 8 with respect to the frame plate 13 on the arc outer surface side. 23 is a lid for closing the opening 21; 24
Is a lid for closing the air bleeding hole 22. The tubular member 24 is provided on the outer surface of the frame plate 13, and the opening 21 or the air bleed is provided in the lid member 25 screwed to the tubular member 24. A plug member 26 that fills the hole 22 is closely arranged, and a rotation operation tool 27 is connected to the lid member 25.

The frame device for manufacturing a segment according to the present invention has the above-mentioned structure, and the concrete segment 5 is molded as follows. That is, as shown in FIG. 3, in a state X in which the assembled formwork 4 is placed vertically and the lid 17 is opened to open the concrete injection port 8 upward, the rebar cage previously installed in the formwork 4 Inject concrete into the mold 4 through the injection port 8 so as to fill (not shown),
In addition, as indicated by a phantom line, the inlet 8 is closed with the lid 17 and fixed with the bolt and the nut.

The amount of concrete injected at this time is slightly less than the amount of concrete required for manufacturing the segment 5 having a predetermined shape without being reluctant to form voids in the lower surface of the lid 17. The concrete inlet 8 is completely closed by the lid 17.

Next, as shown in FIG. 4, the form 4 is drive-switched to a horizontal state Y in which the frame plate 13 on the arc outer surface side of the form 4 is faced up, and the lids 23 and 24 are appropriately opened. With the air removed from the air vent hole 22 being removed, concrete is replenished so as to fill the void in the lower surface of the lid 17 through the opening portion 21, and the opening portion 21 and the air vent hole 22 is closed by the lids 23 and 24 so that the plug member 26 is filled up with the plug member 26.

After the concrete is solidified, as shown in FIG. 5, the form 4 is switched to the vertically placed state X to open the lid 17, and at the same time, the frame plate 13 and the side on the arc outer surface side. The frame plates 15 and 15 are disassembled and the concrete molded product (segment 5 shown in FIG. 6) is demolded. The demolding of the segment 5 is performed by the mold 4 shown in FIG.
It is also possible to perform in the horizontal state Y of.

According to the above-mentioned manufacturing method, concrete is poured in the vertically placed state X of the form 4 shown in FIG. 3, so that the five faces of the segment 5 except the end face 6 at one end in the axial direction, that is, the segment 5 A total of five surfaces, that is, the end surface 7 on the other end side in the axial direction, the end surfaces 14 on both sides in the circumferential direction, and the inner and outer circular arc surfaces 10 and 11 can be finely and finely finished.

The end face 6 on the one end side in the axial direction, that is, the end face on the concrete injection port 8 side closed by the lid 17 is slightly less than the amount of concrete required for manufacturing the predetermined segment 5. Since concrete is poured into the form 4, a gap is created in the part, but after the concrete injection port 8 is completely closed by the lid 17, the form 4 is closed as shown in FIG. The end face 6 of the segment 5 on one end side in the axial direction of the segment 5 is densely formed by taking a means of rotating and replenishing the concrete from the opening 21 near the concrete injection port 8 and closing the opening 21. It can be finished neatly.

That is, the form 4 for manufacturing the segment is in a vertically placed state X in which the above-mentioned five faces of the segment 5 form a dense and beautiful finished surface, and the concrete is replenished to the concrete inlet 8 side surely. Since it can be switched to the horizontal state Y in which it is formed, the segment 5 in which the six surfaces have a fine and clean finished surface having predetermined dimensions is manufactured.

Although not shown in the above embodiment,
The segment manufacturing mold device is equipped with a vibrator, and is configured so that the mold 4 is vibrated at the time of pouring the concrete including replenishment.

The concrete poured into the mold 4 is of a low slump and does not need to be drained. However, if draining is absolutely necessary, the air vent hole 22 or the opening 21 is required. The air vent hole 22 can be omitted because water can be drained through the vent hole, or air can be drained in addition to the water drain by the opening 21 for replenishing the concrete. However, the present invention can be implemented.

The openings 21 for concrete replenishment are divided into a plurality of openings (five in the illustrated example).
The elongated opening 21 may be formed along the concrete inlet 8 and the lid 23 may be provided on the opening 21.

[0030]

As described above, in the method for manufacturing a segment according to the present invention, the mold is placed vertically, concrete is poured, the concrete inlet is closed with a lid, and the mold is rotated, It is characterized in that it takes a means to replenish the voids on the concrete inlet side with concrete, which allows the segment to be dense, clean and predetermined not only on the end face on one end side in the axial direction but also on the remaining five faces. Since it is possible to mold with high precision according to the dimension of, and because the finish accuracy between the end faces in the axial direction as well as between the end faces in the circumferential direction is high, it is possible to make sure that the end faces of the segments that are spliced with each other will not hit each other. The present invention prevents the occurrence of cracks and collapses at the time of replenishing a strong segment, and the segment manufacturing method according to the present invention has an extremely high commercial value. Segment is prepared.

In the segment manufacturing mold apparatus of the present invention, the segment manufacturing frame is placed vertically with the five surfaces of the segment forming a dense and beautiful finished surface, and in the axial direction of the segment. The apparatus is characterized in that it is configured to be switchable to a horizontal state where the portion corresponding to one end side can be reliably replenished with concrete, and according to such a device, According to the method of the invention, a segment having a high commercial value is produced, that is, a segment having six surfaces having a fine and precise finished surface having predetermined dimensions.

[Brief description of drawings]

FIG. 1 is a perspective view of a frame device for manufacturing a segment.

FIG. 2 is a cross-sectional view of a frame for manufacturing a segment.

FIG. 3 is a cross-sectional view showing a vertical state of the segment manufacturing form device.

FIG. 4 is a cross-sectional view showing a horizontal state of the segment manufacturing form device.

FIG. 5 is a cross-sectional view at the time of segment demolding.

FIG. 6 is a perspective view of a partially broken segment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base, 4 ... Formwork, 5 ... Segment, 8 ... Concrete pouring port, 13 ... Arc outer surface side frame plate, 17, 23 ... Lid body, 19 ... Formwork rotation means, 21 ... Opening part.

Claims (2)

[Claims] 1. A method of manufacturing a concrete segment for forming a cylinder, which is divided into a plurality of pieces in the circumferential direction and the axial direction, wherein a portion corresponding to one end side in the axial direction of the segment is opened upward as a concrete inlet. In an arc-shaped formwork, while pouring a predetermined amount of concrete, closing the concrete injection port with a lid, and rotating the formwork with the frame plate on the arc outer surface side facing upward, A segment characterized by replenishing concrete into the formwork through an opening near the injection port formed in the frame plate on the outer surface side, closing the opening with a lid, and demolding the segment after solidification of the concrete Manufacturing method. 2. A formwork apparatus for manufacturing a concrete segment for forming a cylinder, which is divided into a plurality of pieces in the circumferential direction and the axial direction, and a portion corresponding to one end side in the axial direction of the segment is opened as a concrete inlet. A circular arc-shaped mold is provided on the base with the injection port facing upward, and an opening for concrete replenishment is formed in the vicinity of the injection port with respect to the frame plate on the arc outer surface side of the mold, A segment is provided which is provided with a lid for closing the injection port and the opening, and is provided with a mold rotating means for rotating the frame with the frame plate on the arc outer surface side thereof facing up. Formwork equipment for manufacturing.