JP4937626B2 - Manufacturing method of irregular segment - Google Patents

Description

  The present invention relates to a method for manufacturing a deformed segment used in an approach portion of an underpass tunnel constructed by a shield method.

Conventionally, underpass tunnels at three-dimensional intersections and the like have been constructed with vertical shafts on both sides of the tunnel portion, constructed between the compatible wells by a propulsion method, a shield method, and the like, and the approach portion is constructed by an open-cut method. In addition, earth retaining work such as pile driving is required in advance for excavation and excavation of shafts, and there are problems with the surrounding environment such as vibration and noise, and when performing these excavation work Since the construction occupation area on the road required for the placement and excavation of heavy machinery and shafts is wide, there is a problem that traffic obstacles occur at construction sites in urban areas. In addition, the construction period was long due to the vertical shaft.
In order to solve such a problem, for example, Patent Document 1 discloses a method of starting a shield excavator from the ground and continuously constructing all lines of the underpass tunnel.
Patent Document 1 assembles a segment having a rectangular section at the rear end of a shield excavator while excavating an underpass tunnel having a rectangular section by combining a plurality of shield excavators having a square section. In a section with a small earth covering such as an approach portion, a shield excavator disposed above among a plurality of shield excavators can be safely excavated by projecting in advance in the tunnel traveling direction. This eliminates the need for large shaft work and excavation work, thereby eliminating the above-mentioned problems in the surrounding environment and shortening the work period.
JP 2005-248546 A

However, according to the conventional method in which the entire underpass tunnel is continuously excavated by the shield method, the segment in the approach section is constructed in a substantially U-shaped section with the top end open until the entire segment is buried in the ground. The upper end surface of the segment needs to be finished so as to be parallel to the ground surface, for example, in the axial direction of the tunnel. That is, the height of the side wall of the segment of the approach portion increases for each ring in the direction in which the tunnel depth increases. In the approach part, in order to adjust the height of the side wall, it was necessary to manufacture a deformed segment having a different height for each ring.
In addition, there is a method of manufacturing an individual mold for each of the deformed segments, but this is not economical. In addition, as another method, for example, a method of manufacturing a deformed segment while modifying the length of the frame material by cutting out the frame material of the mold so that the height dimension of the deformed segment becomes a plurality of different lengths. There is. In this remodeling work, it took time and labor to cut the frame material and the processing of the cut surface, and there was a problem that the cost of remodeling the mold for each deformed segment was incurred, which was not economical.

  The present invention has been made in view of the above-described problems, and provides a method for manufacturing a deformed segment that can manufacture a plurality of deformed segments having different lengths with a single formwork and that can reduce manufacturing costs. For the purpose.

In order to achieve the above object, a method for manufacturing a deformed segment according to the present invention is to manufacture deformed segments having different height dimensions by placing concrete by moving the position of the placing surface within the formwork. The deformed segment manufacturing method is provided with a removable mold frame member that moves the position of the casting surface on the mold frame, and the concrete is cast in the mold frame partitioned by the movable mold frame member. The movable mold member is a partition plate that partitions the dimension in the height direction of the deformed segment in the mold, and a plurality of partition plates are arranged in the mold, and the mold is removed by sequentially removing the partition plate. The concrete is characterized in that the concrete is placed by changing the height direction dimension of the placement region in the frame .
According to the present invention, since the movable mold member is detachably provided on the mold, the movable mold member is disposed at a predetermined position according to the height dimension of the deformed segment to be manufactured, and the placing surface is provided. Can be formed. And since the arrangement | positioning position can be changed by attaching or detaching a movable mold member, the deformed segment from which a height dimension differs can be manufactured with one mold.

Moreover, the moving mold members are the partition plate partitioning the height dimension of the profiled segments in the mold, placing the partition plate into the mold in accordance with the height dimension of the profiled segments to produce Thus, the casting surface can be formed at a predetermined position. And since the arrangement position can be changed by removing the partition plate and moving it appropriately, it is possible to manufacture deformed segments having different height dimensions with one mold.

Furthermore, since the partition plates are arranged in the formwork and the concrete is placed by changing the height direction dimension of the placement area in the formwork by removing the partition plates in sequence , the height of the deformed segment It can be manufactured by gradually increasing the dimensions. In addition, the placement surface can be moved by a simple operation of simply removing the partition plate in order, which is efficient and can reduce the labor of the operation.

In the modified segment manufacturing method according to the present invention, the end plate of the formwork is moved, and the concrete is placed by changing the size of the placement area in the formwork, whereby the deformed segments having different height dimensions are obtained. The end plate is an upper end plate that partitions the height direction dimension of the deformed segment, and the side end plate of the formwork arranged in the height direction of the deformed segment. And the upper end plate is moved in the height direction by removing or attaching at least a part of the divided side end plate.
According to the present invention, the length of the side end plate, that is, the dimension in the height direction of the deformed segment is changed by removing or attaching the appropriately divided side end plate in accordance with the height dimension of the deformed segment to be manufactured. The upper end plate is moved and arranged so as to be connected to the side end plate having a different length, so that a casting surface can be formed at a predetermined position. Can be manufactured.

According to the modified segment manufacturing method of the present invention, since the movable mold frame member is detachably provided on the mold frame, the movable mold frame member is arranged at a predetermined position according to the height dimension of the deformed segment to be manufactured. Thus, the casting surface can be formed. A plurality of partition plates are arranged in the mold, and the partition plates are removed in order to change the height direction of the placement area in the mold to place concrete. It is possible to manufacture deformed segments having different height dimensions. For this reason, the operation of moving the movable mold member is not time-consuming and can be performed in a very short time, and there is no need to remodel the mold or provide a mold for each deformed segment as in the prior art. The manufacturing cost of the segment can be reduced.
Further, according to the modified segment manufacturing method of the present invention, the upper end plate of the mold can be moved and arranged in the height direction of the deformed segment, and the casting surface can be formed at a predetermined position. Different shaped segments with different height dimensions can be produced in one mold.

Hereinafter, a method for manufacturing a deformed segment according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a partially broken perspective view showing a manufacturing state of a deformed segment according to the first embodiment of the present invention, FIG. 2 is a plan view showing the manufacturing state of a deformed segment, and FIG. 3A is an overall view showing an underpass tunnel. FIG. 4 is a side view showing the approach portion, FIG. 4 is a view showing the segments installed in the approach portion, (a) is a sectional view thereof, and (b) is a partial side view thereof. .

  The manufacturing method of the odd-shaped segment by this 1st embodiment shown by FIG.1 and FIG.2 is an under, such as a three-dimensional intersection which consists of the shield tunnel constructed | assembled by the rectangular segment extended in the natural ground by the shield method. The deformed segment 21 applied to the approach portion 2A of the path tunnel 2 is manufactured using the mold 10 (see FIGS. 3A and 3B).

First, the underpass tunnel 2 and the approach portion 2A to which the deformed segment 21 is applied will be described.
As shown in FIGS. 3A and 3B, the underpass tunnel 2 is constructed in a substantially U shape in a side view, and extends from the ground surface G to the tunnel portion 2B. It consists of an approach portion 2A that communicates up to 2B and is open at the top. In other words, a slope that gradually increases in depth from the ground toward the ground is formed, becomes a substantially horizontal direction at a predetermined depth, and further, an upward slope is formed at a predetermined position toward the ground. Yes.

As shown in FIGS. 3A and 3B, the shield method employed in the construction of the underpass tunnel 2 can employ various well-known methods, but in the first embodiment, the cross-section A rectangular cross-section shield machine (not shown) is used for the advantage of effective use, and a concrete segment is assembled behind this rectangular shield excavator.
In addition, this rectangular shield excavator can excavate by making each excavation cross section small, for example by dividing | segmenting a cutter into plurality. Then, by leading the upper cutter before the lower cutter, the approach portion 2A with a small earth covering can stably excavate the natural ground.

  As shown in FIGS. 3 (b), 4 (a) and 4 (b), the segment ring 20 constructed continuously in the tunnel axis direction on the approach portion 2A has individual segment pieces connected in the circumferential direction. It is comprised and has comprised the substantially U shape by the cross sectional view which open | released the upper end. That is, the segment ring 20 includes side portions 20b and 20b and a bottom portion 20c. And the upper end part 20a of the segment ring 20 is constructed | assembled so that it may become substantially flush with the ground surface G, for example. Therefore, as the tunnel depth increases, the height dimension of the side portion 20b of the segment ring 20 (see FIG. 4A) increases.

In addition, the segment ring 20 is provided with a deformed segment 21 having a different height for each segment ring 20 at the upper part of both side portions 20b and 20b, and the height of the approach portion 2A described above is substantially the ground surface G. It has been adjusted.
In the plan view shown in FIG. 2 or the side view shown in FIG. 4B, the upper end surface 21a of the deformed segment 21 is inclined at a predetermined angle with respect to the lower end surface 21b, and the side end surfaces 21c and 21d are parallel to each other. ing.
In the following description, the “height dimension (direction) of the deformed segment 21” and the “vertical direction” are the height dimension and the vertical direction in which the deformed segment 21 is arranged.

Next, the structure of the mold 10 used for manufacturing the deformed segment 21 according to the first embodiment will be described with reference to the drawings.
A mold 10 shown in FIG. 1 includes an outer shell 30 formed in a box shape, and a flat partition plate 40 (moving mold member) that partitions the dimension in the height direction of the deformed segment 21 inside the outer shell 30. ).
The outer shell 30 includes a thin plate-shaped mold plate 31 that covers the inner peripheral surface or outer peripheral surface of the deformed segment 21 and an end plate 32 that is fixed to the outer peripheral edge 31 a of the mold plate 31. As shown in FIG. 2, the end plate 32 includes an upper end plate 32a disposed at a position corresponding to the upper end surface 21a of the deformed segment 21, and a lower end plate 32b disposed at a position corresponding to the lower end surface 21b. , And side end plates 32c and 32d arranged at positions corresponding to the side end surfaces 21c and 21d, respectively. And these each members are joined by adhering means, such as welding.

As shown in FIG. 2, a plurality of partition plates 40, 40... Arranged obliquely in the outer shell 30 are arranged in the height direction of the deformed segment 21 with a predetermined interval.
A region where these partition plates 40, 40... Are arranged is a region excluding the placement region R of the deformed segment 21 inside the outer shell 30. Then, the first partition plate 40A is arranged at a position where the deformed segment 21 having the smallest height dimension (hereinafter referred to as “first deformed segment 21A”) is placed. Here, the placement region R side of the first partition plate 40A is the placement surface 40a. That is, the concrete C is placed between the placement surface 40 a and the outer shell 30. And the placement surface 40a of the partition plate 40 is arrange | positioned with the same inclination angle so that the inclined surface of the upper end surface 21a of the deformed segment 21 mentioned above can be formed.

In addition, these partition plates 40, 40... Are detachably attached to the outer shell 30. A method for attaching the partition plate 40 to the outer shell 30 is, for example, a bolt or the like from the outside of the side end plates 32c and 32d so that the partition plate 40 does not come off or shift by being pressed by the pressure of the concrete C placed. It is fixed by a fixing member (not shown).
When manufacturing the deformed segment 21, the opening forming the upper surface side of the mold 10 (the side facing the mold plate 31 shown in FIGS. 1 and 2) is covered with a lid frame plate (not shown). Concrete C is placed in the placement region R of the mold 10 through a placement hole that penetrates the frame plate.

The configurations of the deformed segment 21 and the mold 10 according to the first embodiment are as described above. Next, a manufacturing method of the deformed segment 21 will be described with reference to the drawings.
First, as shown in FIG. 2, a plurality of partition plates 40, 40... Are attached to predetermined positions in the mold 10 in advance. Then, concrete C is placed in the placement region R on the placement surface 40a side of the first partition plate 40A of the mold 10 to manufacture the first deformed segment 21A.
Next, the first partition plate 40 </ b> A is removed from the outer shell 30. If it does so, the 2nd partition plate 40B arrange | positioned at the back surface side of the placement surface 40a of the 1st partition plate 40A will become the placement surface 40a of the 2nd variant segment 21B manufactured next. The second deformed segment 21B manufactured at this time has a height dimension larger than that of the first deformed segment 21A. In this manner, the deformed segments 21 having different height dimensions can be manufactured by sequentially removing the plurality of partition plates 40 arranged for each concrete placement from the first partition plate 40A.

  In addition, the quantity of the partition plate 40 arrange | positioned in the formwork 10 (outer shell 30) is not limited to plural, and may be single. In the case of a single unit, the partition plate 40 may be moved and used repeatedly for each height dimension of the deformed segment 21 to be manufactured. In this case, since it is not necessary to provide a plurality of partition plates 40, there is an effect of reducing the cost.

  As described above, in the modified segment manufacturing method according to the embodiment, since the partition plate 40 is detachably provided on the outer shell 30 of the mold 10, the predetermined segment according to the height dimension of the modified segment 21 to be manufactured is used. The placement plate 40a can be formed by arranging the partition plate 40 at the position. And since the arrangement position can be changed by removing and attaching the partition plate 40, the odd-shaped segment 21 from which a height dimension differs by one moldwork can be manufactured. For this reason, the operation of moving the partition plate 40 can be performed in a very short time without trouble, and it is not necessary to remodel the mold as in the prior art or to provide a mold for each deformed segment. The manufacturing cost of the segment can be reduced.

Next, a second embodiment of the present invention, but have been explained based on FIG. 5, the first embodiment and the same or similar members described above, a description using the same reference numerals A configuration that is omitted and different from the first embodiment will be described.
FIG. 5 is a plan view showing a manufacturing state of the deformed segment according to the second embodiment, and corresponds to FIG.
As shown in FIG. 5, in the mold 10 according to the second embodiment, the inner surface of the moving upper end plate 33 (corresponding to the “upper end plate” of the present invention) of the outer shell 30 forms the placing surface 33 a. The moving upper end plate 33 is configured to move in the height direction of the deformed segment 21. The placing surface 33a of the moving upper end plate 33 is disposed with the same inclination angle so that the inclined surface of the upper end surface 21a of the deformed segment 21 can be formed.
Further, the side end plate 32c and the side end plate 32d form a side end plate piece 34 divided into a plurality of parts in the height direction of the deformed segment 21, and each of the divided side end plate pieces 34 is removed. It is provided as possible. The movable upper end plate 33 is configured to be removable by a fixing member (not shown) such as a bolt with respect to the side end plates 32c and 32d after the predetermined side end plate piece 34 is removed or attached. ing.
As shown in FIG. 5, when the height of the deformed segment 21 is reduced, that is, when the position of the moving upper end plate 33 is moved in the direction of arrow E (direction from the solid line to the two-dot chain line in the figure). Remove the moving upper end plate 33 and remove the appropriate number of side end plate pieces 34, and then attach the moving upper end plate 33 to the end portions of the side end plates 32c and 32d. Thereby, the placement surface 33a of the moving upper end plate 33 can be moved to the position of the two-dot chain line in the figure.
The deformed segment 21 can be manufactured by placing concrete C in the space (placement region R) between the placement surface 33a of the movable upper end plate 33 and the outer shell 30 thus moved. . Also in the second embodiment, since the deformed segment 21 having different height dimensions can be manufactured with one mold 10, the same effect as that of the first embodiment can be obtained.

Next, FIG. 6 is a plan view showing a manufacturing state of the profiled segment according to reference example, which is a diagram corresponding to FIG.
As shown in FIG. 6, the configuration of the outer shell 30 according to the reference example is the same as that of the first embodiment. And in this reference example , the placement surface 50a is formed by arranging the fitting member 50 in the space between the placement region R and the outer shell 30 in the outer shell 30, and the placement region R is formed in the placement region R. The deformed segment 21 is manufactured by placing concrete C.
This fitting member 50 can use materials, such as a polystyrene foam, resin, concrete, etc., for example. A plurality of types of fitting members 50 that match the height dimension of the deformed segment 21 are prepared, and the fitting member 50 having a size corresponding to the deformed segment 21 to be manufactured is disposed in the outer shell 30. Thus, a plurality of types of deformed segments 21 can be manufactured.
Also in the third embodiment, since the deformed segment 21 having different height dimensions can be manufactured with one mold 10, the same effect as the first and second embodiments can be obtained.

The first and second embodiments of the modified segment manufacturing method according to the present invention have been described above, but the present invention is not limited to the first and second embodiments described above, Changes can be made as appropriate without departing from the scope.
For example, in the first embodiment, the manufacturing procedure is such that a plurality of partition plates 40 are arranged in advance in the outer shell 30 and the partition plates 40 are sequentially removed. However, the present invention is not limited to this. Alternatively, the partition plate 40 may be attached in sequence. In short, in the first and second embodiments, the number, attachment, and removal of the partition plate 40 can be arbitrarily performed, and the placement surface 40a is positioned at a position corresponding to the height dimension of the deformed segment to be manufactured. What is necessary is just to move 33a and 50a.
Further, in the first and second embodiments, the present invention is applied to the production of the deformed segment 21 used in the approach portion 2A of the underpass tunnel 2, but the present invention is not limited to such an application. You may apply to manufacture of the structure made from a precast constructed | assembled in the cut-off part which has a ramp.

It is a partially broken perspective view which shows the manufacturing state of the odd-shaped segment by 1st embodiment of this invention. It is a top view which shows a deformed segment manufacturing state. (A) is a whole side view which shows an underpass tunnel, (b) is a side view which shows an approach part. It is a figure which shows the segment installed in the approach part, Comprising: (a) is the sectional drawing, (b) is the partial side view. It is a top view which shows the manufacturing state of the odd-shaped segment by 2nd embodiment, Comprising: It is a figure corresponding to FIG. It is a top view which shows the manufacturing state of the irregular segment by a reference example , Comprising: It is a figure corresponding to FIG.

Explanation of symbols

2 Underpass tunnel 2A approach section
10 mold frame 20 segment 21 deformed segment 30 outer shell 32 end plate 32c, 32d side end plate 33 moving upper end plate (upper end plate)
40 Partition plate (movable mold member)
40a, 33a, 50a Placing surface 50 Fitting member (movable mold member)
R Casting area C Concrete

Claims (2)

A method of manufacturing a deformed segment in which a deformed segment having a different height dimension is manufactured by moving the position of the casting surface within the mold and casting concrete,
In the formwork, a removable formwork member that moves the position of the placement surface is provided, and concrete is placed in the formwork partitioned by the movable formwork member ,
The movable mold member is a partition plate that partitions the dimension in the height direction of the deformed segment in the mold,
A plurality of the partition plates are arranged in the mold, and the concrete is placed by changing the height dimension of the placement region in the mold by sequentially removing the partition plates. A process for producing a deformed segment characterized by the above. A method for manufacturing a deformed segment in which a deformed segment having a different height dimension is manufactured by moving the end plate of the mold and changing the size of the placing area in the mold to place concrete. There,
The end plate is an upper end plate that partitions the dimension in the height direction of the deformed segment,
Dividing the side end plate of the formwork arranged in the height direction of the deformed segment into a plurality of parts,
A method for producing a deformed segment, wherein at least a part of the divided side end plate is removed or attached, and the upper end plate is moved in the height direction.

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