JPH0550420A - Manufacture of concrete segment - Google Patents

Abstract

PURPOSE:To easily mass-produce a concrete segment of high precision by providing the predetermined number of partitions at predetermined locations in a ring-shaped form including an inner circumferential wall for forming a ring- shaped gap for placing of concrete, an outer circumferential wall, and a bottom wall so as to divide circumferentially said gap into even number of sections. CONSTITUTION:In a ring-shaped form including an inner circumferential wall for forming a ring-shaped gap for placing of concrete, an outer circumferential wall, and a bottom wall, there are provided a predetermined number of partitions 3,3' at predetermined locations so as to circumferentially divide said gap into even number of sections. Next, concrete is placed into alternate sections, leaving thereby empty sections 2 alternately. Thereafter the upper surface 4 of the concrete having been placed is finished and the partitions are removed after the concrete is cured so that the end surfaces of the cured concrete, from which the partitions have been removed, are utilized as side walls of the empty sections 2, into which concrete is cast and cured, its upper surface being finished, so that the concrete is separated into concrete segment blocks, each of which is formed in each section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a concrete segment.

[0002]

2. Description of the Related Art Generally, a conventional concrete segment is constructed by placing a reinforcing member and an embedded member such as a joint metal fitting in a rigid steel mold for one segment, and It is placed and manufactured. However, this method requires that the concrete surfaces of the segments that are made by different formwork, which are in contact with each other between segments (including between segment rings), be as flat and intimate as possible. The precision had to be significantly increased. For this reason, the formwork price is naturally high. Furthermore, in mass production of the segment,
It is necessary to prepare many such forms. Due to such circumstances, the segment price was inevitably high.

[0003]

The present invention is intended to solve the above problems, and the gist thereof is as set forth in the appended claims.

The present invention is a so-called match cast in which the contact surfaces of the segments between the segments or between the segment rings are directly placed on the concrete surfaces of the other segments which will be in contact with the concrete surfaces of the four sides of the segments. A method for manufacturing a segment by a construction method, which provides a method for manufacturing a segment that does not use a large number of molds which is expensive as in the past. Of course, the same manufacturing method can be applied to the case where the embedding member is embedded.

In the present invention, after the cast concrete is hardened, it is separated into concrete segments for each section. To easily do this, it is sufficient to use a stripping agent that is usually used at the time of placing concrete. ..

In the present invention, the embedding member is a reinforcing member such as a reinforcing bar, a positioning member such as a dowel, and an embedding member such as a joint fitting member.

According to the first to fifth aspects of the present invention, the concrete segment can be efficiently mass-produced. However, according to the sixth aspect, the concrete segment can be continuously produced more efficiently.

According to the invention of claim 7, the advantages of the present invention can be more effectively enjoyed. In other words, the greatest advantage of the present invention is that the concrete of another segment, which will be in contact with the concrete surface of the four sides of the segment, is directly cast on the surface of the segment, so that the precise contact surface of the four sides of the segment can easily Consistency can be achieved, but by embedding the alignment member in the segment, it is possible to easily use the alignment member at the same position as that at the time of manufacturing when the segment manufactured by the present invention is assembled and constructed. This is because they can be matched with each other and the delicate consistency during manufacturing can be accurately reproduced.

The invention according to claim 8 is characterized in that the partition plates are arranged with a predetermined inclination.
The method for producing a concrete segment according to any one of 1. By this manufacturing method, the joint surface of the segment can be angled. In particular, it is preferable that the surface of the segment joint surface in the direction of the tunnel axis is not parallel to the line of the tunnel axis as in a normal segment, but is formed at a slight angle with respect to the line of the tunnel axis. With this, a remarkable effect as described in the following examples is also exhibited.

The invention according to claim 9 is the method for producing a concrete segment according to any one of claims 1 to 8, wherein the partition plate is a partition plate having a stepwise bent portion. By this manufacturing method, a step can be formed on the joint surface of the segment. In particular, it is recommended that the segment joint surface is not one flat surface like an ordinary segment, but two parallel surfaces having a very small step near the center in the thickness direction of the joint surface. As a result, a remarkable effect as described in Examples described later is also exhibited.

The present invention utilizes the so-called match casting method. However, even if the ring joint surface of the segment is not manufactured by match casting, the ring joint surface of the already assembled segment is completed. On, a thin mat impregnated with a resin, the curing time of which is adjusted appropriately, is attached, and if the segments of the next lot are assembled, the resin is cured after the assembly to make the ring joint surface not match-cast watertight, and , The compressive stress can be smoothly transmitted without causing point contact on the joint surface. As a result, it is possible to obtain joints that exhibit sufficient compressive strength even when subjected to a strong shield jack reaction force.

[0012]

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

FIG. 1 is a view showing an embodiment of the present invention, and FIG. 3 shows only a segment ring composed of a concrete segment block manufactured by this embodiment. Explaining the process, first, an inner peripheral wall 6 and an outer peripheral wall 7 of a circular mold for a segment ring are assembled on a mold bottom wall 5, and partition plates 3 and 3'are attached to the outside of each segment section 1, After arranging the reinforcing bars, joint fittings, dowels, etc., first, concrete in the segment section 1 is placed, and the ring joints, that is, the upper surfaces 4 and 14 to be joints in the tunnel axial direction are carefully finished. At this time, no concrete is placed in the segment section 2.

Then, after some time has passed, the partition plate 3,
When the concrete is hardened to such an extent that the concrete surface is not hindered even if 3'is removed, the partition plates 3 and 3'are removed, and the segment joint surface on the side of the cast and hardened segment 11, that is, the joint in the direction perpendicular to the tunnel axis. The release agent is also applied to the concrete surface 13 that will become the segment section 2
Concrete of segment 11 concrete side 1
3 is directly cast as a side wall and the upper surface 14 is carefully finished to complete the segment ring (I).

FIG. 2 is also a view showing another embodiment of the present invention, and FIG. 4 shows only a segment ring made of a concrete segment block manufactured by this embodiment. In this example, the release agent is applied to the concrete finishing surface 14 which is the ring joint surface on the upper surface of the foundation stage segment ring (I) formed by the above-described process, and the same procedure as the segment ring (I) is applied. The upper segment ring (II) is completed.

Thereafter, the segment ring (II
Stack I) and (IV) to complete.

FIG. 5 shows a four-stage segment ring (I).
After forming (II), (III) and (IV), the loads of the segment rings (II), (III) and (IV) of the second stage and above are temporarily supported by a jack or the like, and the segment ring (I It is a figure which shows the state which separates the lower part from the ring joint surface 14 by decelerating only 15) like 15, and removes. Then, as shown in FIG. 6, each segment of the removed segment ring (I) is extruded outwardly of the segment ring as shown at 16 to separate into individual segments. If each segment is separated and put away as shown in FIG. 6, the segment ring (I
I) The above is reduced by 1 ring width as in 17.

Next, after further manufacturing and stacking segment rings on the segment ring (IV), only the lowest segment ring (II) is similarly removed and separated into segment blocks of each section. Figure 5,
A method similar to that shown in FIG. 6 may be used. By repeating such methods and steps, a large number of segments can be continuously manufactured.

FIG. 7 shows the arrangement of the dowels and the like that are attached during the manufacturing of the segment.
For No. 4, the female 18 and male 19 of the dowel are combined to form the dowel 20, and the opposing ring joint surfaces 14 are aligned in the correct position. The segment joint surface 13 is aligned with the correct position by the positioning jig formed by combining the steel plate 21 and the wedge 22 attached at the time of manufacturing the segment.

FIG. 8 shows a dowel for the ring joint surface 14, and FIG. 9 shows an alignment jig for the segment joint surface 13.

FIGS. 10 (a), (b), (c) and (d) show the shape of the segment manufactured according to one embodiment of the present invention as claimed in claim 8 or 9 and the advantages of such a shape. Is.

As shown in (a), when the segment 11 is assembled and then the segment 12 is assembled, a method of aligning the surface 13 with the position at the time of manufacture using a positioning jig as shown in FIG. 7 will be described. However, in this case, the surface 13 is made up of two parallel surfaces provided with a very small step 25, and when the segment 12 is assembled in the tunnel, as in 17 when the segment 12 is assembled from the inside to the outside of the tunnel. Segment 12 side 1
When the segment 12 is extruded along with, the segment 12 is near the position where the segment 12 and the segment 11 face each other at the time of manufacturing, without using a positioning jig as shown in FIG.
It can be easily adjusted to the position perpendicular to the shield axis.

(B) is a development view of the segment ring. The angle 24 is set to a very small angle with respect to the tunnel axial line, but as shown in (d), when the insertion 28 of the male 19 of the bell is started in the female 18 of the bell.
If the surface 13 is parallel to the shield axis direction, it may not be possible to smoothly match the surface 14 due to mutual friction between the concrete surfaces of the surface 13 and minute unevenness, so avoid this. Therefore, when the insertion of the dowel is completed and the surface 14 is aligned, the surface 1 and the step 25 are aligned, so that the assembly of the segment 12 can be smoothly performed.

(C) is a detailed enlarged view of the segment joint surface 13.

Reference numerals 26 in (a) and (b) are key segments, and the angle 24 with respect to the shield axial direction is the same as that of the other segments.

FIG. 11 shows a joint filler which ensures watertightness of the joint surface, smoothly transmits compressive stress, and exerts sufficient compressive strength when the ring joint 14 'is not match cast. 29 shows the concept of a ring joint formed by arranging 29. Reference numeral 30 denotes a segment which has been assembled, and 31 denotes a segment which has not been matte cast and which is to be assembled. By using such a joint material, it is possible to easily cope with before and after the taper ring or when it is necessary to assemble a segment ring which is not continuously manufactured in the same mold.

[0027]

As described above, according to the present invention, it is not necessary to use a mold having a high manufacturing accuracy for each segment for manufacturing a concrete segment, and
Since it is not necessary to prepare a large number of such elaborate molds, the industrial, technical or practical effect thereof is extremely large. Further, according to the present invention, delicate concrete segments can be mass-produced quickly and easily, and the effect is immeasurable.

Further, since the present invention greatly contributes to the reduction of the price of the segment which occupies a large weight in the shield tunnel construction cost, the industrial utility of the present invention is extremely great. Can be said.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a schematic view showing a segment ring (I) composed of a concrete segment block formed according to the embodiment of FIG.

FIG. 4 is a schematic view showing a state in which a plurality of stages of segment rings made of concrete segment blocks formed according to another embodiment are formed.

FIG. 5 is a view showing a state in which the lowermost segment ring is released and removed.

FIG. 6 shows a method of separating a segment ring of concrete segment blocks into individual segments.

FIG. 7 is a diagram showing a state of arrangement of dowels and alignment jigs for correctly aligning the ring joint surface and the segment joint surface of the concrete segment with the opposite surfaces during manufacturing.

[Figure 8] Enlarged view of Dobel

FIG. 9 is an enlarged view of a positioning jig.

10A is a layout of steps of a segment joint surface 13, FIG. 10B is a development view of a segment ring, and an angle 24 formed by the shield axis direction line of the surface 13 is shown in FIG. FIG. 3D is a view for explaining the advantage of setting the state of the step formed on the surface 13 at an angle 24 by slightly inclining the surface 13 with respect to the tunnel axis direction line.

FIG. 11 is a diagram showing a state in which the joint filler is used when the ring joint surface is not match cast.

[Short description of reference numerals] 1 ... Segment section for placing concrete first 2 ... Segment section for placing concrete later 3, 3 '... Partition plate 4 ... Top surface of concrete when placed 5 ... Formwork Bottom wall 6 ... Inner peripheral wall of formwork 7 ... Outer peripheral wall of formwork 11 ... Segment in which concrete is placed first 12 ... Segment in which concrete is subsequently placed 13 ... Segment joint surface 14 ... Ring joint surface 14 '... Match cast Unjointed ring joint surface 15 ... Slightly lowering of the lowermost segment ring 16 ... Extrusion to the outside of the ring to separate the segment ring into individual segments 17 ... Descent by one ring width greater than the segment ring (II) 18 ... Dibel female 19 ... Dibel male 20 ... Dibel 21 ... Alignment jig steel plate 22 ... Alignment jig wedge 23 ... Alignment cure Anchor muscle of tool 24. Angle formed by segment joint surface with tunnel axis direction 25. Very small step on the segment joint surface 26. Key segment 27. Movement in the direction perpendicular to the tunnel axis during segment assembly 28. Movement in the axial direction of the tunnel during segment assembly 29 ... Joint filler used for the ring joint surface that is not matched cast 30 ... Segment that has been assembled 31 ... Segment that is not matched cast (I) -... 1st stage Segment ring (II) ... Second stage segment ring (III) ... Third stage segment ring (IV) ... Fourth stage segment ring

Claims (9)

[Claims] 1. A ring form having an inner peripheral wall, an outer peripheral wall and a bottom wall forming a ring-shaped void for pouring concrete, wherein the ring-shaped void is divided into an even number of sections in the circumferential direction. Arranging a certain number of partition plates at predetermined locations, then placing concrete in every other one of the even numbered sections, leaving unplaced sections in every other section, then finishing the cast concrete upper surface, After the concrete has hardened, the partition plate is removed, and then the end surface of the hardened concrete from which the partition plate has been removed is used as a side wall of the uncast section, concrete is cast in the uncast section, and the concrete top surface is cast. Is finished, and after the concrete is hardened, it is separated into concrete segment blocks for each section. 2. The method for producing a concrete segment according to claim 1, wherein, when concrete is poured into each of the sections, the embedding member is arranged in the section and then the concrete is poured. 3. A ring form having an inner peripheral wall, an outer peripheral wall, and a bottom wall forming a ring-shaped void for pouring concrete, wherein the ring-shaped void is divided into an even number of sections in the circumferential direction. Arrange the number of partition plates at the predetermined places, then
A partition member is placed after placing an embedding member in every one of the even-numbered sections, placing concrete, leaving an unplaced section in every other section, then finishing the placed concrete upper surface, and hardening the concrete. Then, using the end surface from which the partition plate of the hardened concrete has been removed as a side wall of the uncast section, an embedding member is placed in the uncast section to cast concrete, and the cast concrete top surface is Finishing, hardening the concrete, and a base step ring consisting of the concrete segment blocks of all the compartments formed by the above-mentioned steps, and a ring-shaped flat surface in which the upper surfaces of the concrete segment blocks of all the compartments are connected to the bottom. As the walls, an inner peripheral wall that rises in contact with the inner peripheral edge of the ring-shaped bottom wall and an outer peripheral wall that rises in contact with the outer peripheral edge are provided. A step of forming a ring form forming a ring-shaped void for placing a torch, and forming an upper ring made of a concrete segment block in the ring form by the same step as the above step,
And, if necessary, by the same step as the above-mentioned step, a step of forming a predetermined number of upper-stage rings consisting of concrete segment blocks on the upper-stage ring by using the ring as a foundation step ring, and the above-mentioned steps And a step of separating the formed ring composed of a plurality of stages of concrete segment blocks into each concrete segment block, and a method for producing a concrete segment. 4. The ring of the lowermost stage is formed by forming a ring composed of a predetermined number of stages of concrete segment blocks according to the process of claim 3 and then temporarily supporting the load of the second or more stages of the ring at any time. Is removed and the removed ring is separated into each concrete segment block. 5. The method of manufacturing a concrete segment according to claim 3, wherein after forming a ring composed of a predetermined number of stages of concrete segment blocks, the load of the second or more stages of the ring is temporarily supported at any time. A method for producing a concrete segment, comprising the steps of removing the lower ring and then lowering the second or more rings a predetermined number of times. 6. The method for manufacturing a concrete segment according to claim 4, wherein the lowermost ring is removed while temporarily supporting the load of the second and higher rings, and then the second and higher rings are unloaded. , And a step of forming a ring consisting of a single-stage concrete segment block on the uppermost ring using the ring as a base stage ring, which are alternately repeated. 7. The embedding member is a dowel or other alignment jig member for aligning the joint surface of the concrete segment at the same position as at the time of manufacturing. Manufacturing method of concrete segment. 8. The method for manufacturing a concrete segment according to claim 1, wherein the partition plates are arranged with a predetermined inclination. 9. The method for producing a concrete segment according to claim 1, wherein the partition plate is a partition plate having a stepwise bent portion.