JP2673180B2 - Construction method of tubular wall for lining of drilling hole - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a tubular wall body for lining an excavation hole, and in particular, two excavation holes having a circular cross section are provided through a common opening. The present invention relates to a method for constructing a vertical double-walled tubular wall for lining an excavation hole, which is formed in such a manner that a part thereof is vertically stacked.

[Conventional technology]

In recent years, as a large-section shield method for constructing a large-section tunnel structure such as a railway tunnel, a so-called double-circle special-section shield method has come into practice. This method uses a shielded excavator with a structure in which two cylindrical shielded excavators are connected, and excavates the ground or ground into a cross-sectional shape that is continuous with two circles partially overlapping. A segment is assembled on the inner surface of the excavated hole to form a cylindrical wall body (primary lining), and a gap is filled between the back of the segment for the primary lining, that is, the segment and the ground. After filling the material, concrete is rolled up on the inner surface of the primary lining (secondary lining), and the ground is supported by them to form a predetermined inner space.

Conventionally, a tubular wall body of this type has been proposed as shown in FIG. In the figure, reference numeral 1 is a main wall portion, and arcuate PC-made (precast concrete) segments 2 are bolted in the length direction (direction forming the arc) and the width direction. Joint fittings 3 are embedded in each joint surface of the segment 2, and insertion holes 3 a for inserting bolts are formed in these joint fittings 3. Reference numerals 4 and 5 denote branching segment segments having a substantially Y-shaped cross section disposed above and below the cylindrical wall body for connecting the left and right main wall portions 1, and PCs are provided between these branching segment segments 4 and 5. Inner wall 6
(Branch part support) is connected. Branch segment
Joint fittings 3 each having an insertion hole 3a are also embedded in the respective joint surfaces of the inner wall 4 and the inner wall 6. In FIG. 7, only the cross section of the cylindrical wall body of the segment 2, the branch segment segments 4 and 5, and the inner wall 6 viewed from the axial direction is shown.
Joint fittings 3 each having an insertion hole 3a are also embedded in the end faces of the tubular wall body that are connected in the circumferential direction.

Next, an example of how to assemble the above cylindrical wall body will be described with reference to FIG. First, the segments 2 are sequentially bolted to the left and right of the lower branch segment 5 in the circumferential direction to form the left and right main wall portions 1, and then the upper branch segment 4 is bolted to the upper ends of the left and right openings of the main wall portion 1. After joining, the inner wall 6 is attached between the upper branch segment 4 and the lower branch segment 5. In order to attach the middle wall 6, the upper branch segment 4 is supported by a lifting machine such as an erector, and the middle wall 6 is inserted between the branching segments 4 and 5 by another lifting machine while bolt insertion holes are being inserted. Adjust the position of 3a, and connect the joint fittings 3 adjacent to each other with bolts.

In this way, a ring-shaped lining body was constructed in the shield machine, and each time the shield machine was dug, the ring-shaped lining body was bolted in the axial direction (width direction) and the tubular wall body was formed. Procrastinate.

In the above description, the case where the branch portion support body is the wall body (intermediate wall 6) has been described, but in the horizontal double type, the wall body portion may be a pillar.

[Problems to be solved by the invention]

However, the above-mentioned conventional method for constructing a tubular wall has the following disadvantages.

That is, the support such as the inner wall 6 formed between the branch segments 4 and 5 has a problem that it is difficult to handle and attach because one piece of the member becomes very long and the weight increases. In the continuous drilling hole, since the branch support, that is, the inner wall 6 constitutes the floor of the upper drilling hole (the ceiling of the lower drilling hole), it is installed in a substantially horizontal direction. However, the work becomes more difficult. Also,
In the conventional tubular wall body for lining a double-hole type drilling hole, the branch portion supports can be provided as pillars at regular intervals, but the vertical double-hole type drilling hole cover can be provided. In the case of the cylindrical wall for engineering work, since the branch support is the floor as described above, it is necessary to make it a continuous body. In other words, for that purpose, it is necessary to make the branch portion support as wide as possible so that a space between adjacent support portions is not formed as much as possible, and there is a problem that the weight is further increased.

The present invention has been made in view of the above circumstances, and it is an object of how to efficiently construct a vertical double-walled tubular wall for lining an excavation hole. It is an issue.

[Means for solving the problem]

INDUSTRIAL APPLICABILITY The present invention is applied to the lining of a vertical double-drilled hole in which two drilled holes having a circular cross section are formed so as to be continuous in a form in which a part of them is vertically stacked through a common opening. , After forming the lower main wall portion by connecting the arc-shaped normal segment in the lengthwise direction, connect a pair of branch segment to the upper open end of the lower main wall portion, and to the upper part of the branch segment , A step of forming an upper main wall portion by connecting the normal segments in the length direction to form a ring-shaped lining body, and a cylinder by sequentially connecting the ring-shaped lining body in the width direction. And the step of extending the wall-shaped wall, at the stage where a plurality of the ring-shaped linings are connected, erection a formwork for floor slab formation between the branch portion segments of the plurality of ring-shaped linings, A force generated in the opposing branch segment is supported by the formwork. A step of, by pouring concrete into the mold in a step of forming a slab over a plurality of ring-shaped lining body consisted of.

Further, it is effective to assemble the pair of branching segments at the upper opening end of the lower main wall portion and then install a support between the pair of branching segment segments facing each other.

[Action]

By supporting the opposite branch segments by the formwork, it is possible to form a plurality of rows of ring-shaped lining bodies, and at the time when a plurality of rows of ring-shaped lining bodies are formed in this way, concrete is placed in the formwork. Placing will promote the integration of floor slabs, as well as formwork assembly, concrete pouring, curing,
Efficiency of all work such as demolding.

Further, when a support is installed between a pair of branch segments that are opposed to each other after assembling the branch segments, this support assists the support function of the form, and the ring-shaped lining body Since the structural rigidity is increased, it is possible to form the floor slab after connecting a large number of these ring-shaped lining bodies, and it is possible to lengthen the section for placing concrete for forming the floor slab. Further, in that case, the section which is driven at one time becomes long, so that the integrity of the floor slab is further improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral A as a whole is a vertical double type in which two excavation holes each having a circular cross section are formed so as to be connected to each other in such a manner that a part thereof is vertically overlapped with each other through a common opening. This is a cylindrical wall body constructed to cover the excavation hole, and this cylindrical wall body A is a vertical wall structure of the conventional cylindrical wall body shown in FIG. is there. In this cylindrical wall body A, reference numeral 1A is an upper main wall portion, reference numeral 1B is a lower main wall portion, and reference numerals 4 and 5 are branching segment segments located at both ends of an overlapping portion of two excavation holes, respectively. Reference numeral 7 is a floor slab formed between the segments 4 and 5.

In order to construct the cylindrical wall body A, first, the lower main wall portion 1B is formed by connecting the arc-shaped segments (normal segments) 2 in the longitudinal direction, and the lower main wall portion 1B The upper main wall portion 1A is formed by bolting the branch segments 4 and 5 to the upper open ends, and connecting the segment 2 again in the length direction above the both branch segments 4 and 5. To do. In the case of forming the branch support from the PC plate, it is installed between both branch segments 4 and 5 at the time when one ring of the ring-shaped lining body is formed in this way, but in the present invention, Ring-shaped lining body R composed of the upper and lower main wall portions 1A and 1B and the branch portion segments 4 and 5.
Do not form the floor until (Fig. 2) is connected by several rings.

However, in the case of the present embodiment, as shown in FIG. 3, when the both branch segment segments 4 and 5 are connected to the upper end of the opening of the lower main wall part 1B, the connection of both branch segment segments 4 and 5 is performed. A support 8 is installed between the end faces 4a and 5a.

The support 8 is divided into both branch segments by the ground pressure.
4 and 5 are opposed to each other with a force trying to narrow. In the embodiment, a turnbuckle 8a is provided as shown in FIG. .

When the ring-shaped lining body R is constructed by several rings as described above, subsequently, as shown in FIG. 3 and FIG. Set up. The formwork 10 is composed of side plates 11 and 11 provided at predetermined distances between the branching segments 4 and 5, and a main plate 12 for forming the lower surface of the target floor slab. 12 is supported from below by a supporting structure (not shown). The side plate 11 is made of steel, and as can be seen from FIG. 3, it has a very high rigidity by having a reinforcing flange 11a and the like. It acts to support the branch segments 4 and 5 against the force generated between them.

After the formwork 10 is installed as described above, concrete is poured into the formwork 10. Here, although the support 8 may be removed when the form 10 is installed, in the embodiment, the support 8 is buried in the cast concrete.
After the casting concrete is hardened, the mold 10 is demolded to complete the construction of the desired floorboard 7.

After that, after similarly assembling the lining body R for several rings,
Multi-row branch section segments 4,5 of the assembled lining body
A formwork 10 for forming a floor slab is installed between them, and concrete is placed to construct a tubular wall body for lining the two vertical drill holes. However, when the mold 10 is installed to form a continuous floor slab after the floor slab 7, one end face of the floor slab 7 formed has the same function as the side plate 11 of the mold. Therefore, when the formwork is installed next time, only one side plate 11 is used.

If the tubular wall for lining double drilled holes is constructed by the above method, the one-piece shape is long and wide, and the weight is large.
It is possible to form a floor slab without using a PC-made segment, which not only improves work efficiency and safety, but also makes it possible to form floor slabs for multiple linings at once, which is extremely efficient. Target. Moreover, the floor slabs can be integrated by forming the floor slabs having a plurality of rows of lining bodies at one time, so that the floor slab can have a strong structure.

Further, as in the present embodiment, when each of the branch segment segments 4 and 5 of each ring-shaped cover R is assembled, the support member 8 is installed between the branch segment segments so that the support members 8 can be installed between them. By 8 the supporting action of both branch portion segments 4 and 5 by the mold 10 (side plate 11) is assisted, and the stress transmission path between the opposing branch segment segments 4 and 5 is further secured. And since this will increase the structural rigidity of the lining body, it is possible to increase the number of rings for one-time placement, for example, if the ring-shaped lining body is 5 m long.
Alternatively, it is possible to build the floor slab 7 at once at the time when 10 m is connected, and the construction work can be made more efficient. Furthermore, when the support 8 is embedded in the concrete to be poured, the support 8 functions as a reinforcing material for the concrete, which is extremely effective.

In carrying out this method, the branch segment
As shown in FIG. 6, it is of course possible to use the ones in which the gibber streak 13 is projected from the connection end surfaces 4a, 5a as 4,5, and in such a case, the floor slab 7 The yield strength can be further increased. Although not shown, before placing concrete in the mold 10, the mold 10
Needless to say, a reinforcing bar such as a reinforcing bar cage may be provided therein. Further, FIG. 3 shows an example in which the supporting body 8 is provided for all the ring-shaped lining bodies R, but the supporting body 8 supports the supporting action between the branching segment segments 4 and 5 by the mold 10 as described above. However, it is possible to use only one or two of them. Furthermore,
For the normal segment 2, this may be a steel segment.

〔The invention's effect〕

As described above, according to the first aspect of the present invention,
The floor slab branching portion in the vertical lining tubular wall body formed by
The shape of one piece is long and can be formed without using a wide and heavy PC segment, which not only improves work efficiency and safety, but also allows multiple floor slab floor slabs to be used once. Can be formed into, and hope for efficient work. Furthermore, the floor slabs can be integrated by forming the floor slabs of a plurality of rows of linings at once, and the floor slab can have a strong structure.

According to the second aspect of the present invention, the support body assists the supporting action of the branching segment by the formwork, and the stress transmission path between the opposing branching segment is ensured, so that the structural structure of the lining body is improved. Since the rigidity is increased, the section where the concrete for forming the floor slab is placed can be extended in one time, which further improves the efficiency of the construction work, and the support is embedded in the concrete. In that case, the support functions as a reinforcing material for concrete, and the yield strength of the floor slab can be increased.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an example of a vertical double-walled tubular wall for lining an excavation hole, FIG. 2 is a perspective view showing a ring-shaped lining, and FIG. 3 is a lining cylinder. 4 is a partial perspective view showing both branching segment parts together with a mold and the like, FIG. 4 is a partial front view showing the support together with the branching segment, and FIG. 5 is a front view showing the mold together with the branching segment. FIG. 6 is a partial perspective view showing another configuration example of both branch segment portions in the lining tubular wall body, and FIG. 7 is a front view showing a conventional lining tubular wall body for excavation holes. . A: tubular wall, 1A: lower main wall, 1B: upper main wall, R: ring-shaped lining, 2 segment (normal segment), 4 branch segment, 5 ...... Branch segment, 7 ...... Floor slab, 8 ...... Support.

Front page continued (72) Inventor Munetaka Ozeki 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Kenzai Kogyo Co., Ltd. (72) Inventor Hirohide Hashimoto 2-6-21 Yaesu, Chuo-ku, Tokyo No. Rose Bay Yaesu Building Ishikawajima Kenzai Industrial Co., Ltd.

Claims (2)

(57) [Claims] 1. A vertical double-type drilling hole is formed by forming two drilling holes having a circular cross section so as to be continuous in the form of being partially overlapped with each other through a common opening. In this case, after forming the lower main wall by connecting arc-shaped normal segments in the length direction, a pair of branch segments are connected to the upper open end of the lower main wall, and the upper part of the branch segment is connected. The step of forming the upper main wall portion by connecting the normal segments in the lengthwise direction to form the ring-shaped lining body, and connecting the ring-shaped lining bodies sequentially in the width direction to form a cylinder. And a step of extending the wall-shaped wall body, at the stage where a plurality of the ring-shaped lining bodies are connected, formwork for floor slab formation between the branching segment segments facing each other in the plurality of ring-shaped lining bodies. It is installed and the opposite branch segment segmen is formed by the formwork. The step of supporting the force generated in the mold, and the step of forming a floor slab over a plurality of ring-shaped lining bodies by placing concrete in the formwork. A method for constructing a tubular wall for engineering work. 2. The method for constructing a tubular wall for lining an excavation hole according to claim 1, wherein a pair of branch segment segments are assembled at an upper open end of the lower main wall segment, and then the pair of opposing segment segments are opposed to each other. A method for constructing a tubular wall for lining an excavation hole, characterized in that a support body is installed between the branch portion segments.