JPH02289798A - Lining cylindrical wall body for excavated hole - Google Patents

Abstract

PURPOSE:To improve the yield strength by constituting segments lining an excavated hole partially overlapped with two circles with cylindrical main wall sections and auxiliary wall sections partially lacking the periphery, and connecting main wall sections at different positions in turn. CONSTITUTION:Cylindrical main wall sections 10 and auxiliary wall sections 11 partially lacking the periphery are connected to form spectacle-shaped segments 12 lining a tandem excavated hole. They are connected by bolts via branch section segments 13. Segments 12 are connected by bolts and lined so that positions of main wall sections 10 and auxiliary wall sections 11 are changed in turn. Wall bodies with a simple structure, high yield strength and good workability can be obtained.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a lining cylindrical wall body assembled for lining a double excavation hole, and particularly relates to a lining cylindrical wall body with a circular cross section.
The present invention relates to a tubular wall body for lining which is suitable for lining excavated holes formed in such a manner that their side portions overlap each other.

``Junioru's technology'' In recent years, a method called the double-circular special cross-section shield method has been used as a large-section shield method for constructing large-section tunnel structures such as railway tunnels.

This construction method uses a shield excavator, which has a structure in which two cylindrical shield excavators are connected, to excavate the ground or the ground in a cross-sectional shape of two circles, with some of them overlapping. , Assemble RC or steel segments on the inner surface of this excavated hole to form a cylindrical wall,
Connect multiple cylindrical walls along the hole (primary lining)
, After filling the back side of the segment of this primary lining, that is, filling the gap between the segment and other linings with a pouring material, concrete is rolled on the inner surface of the primary lining (secondary lining),
They support the ground and form a predetermined inner space.

Conventionally, as cylindrical wall bodies constructed by the above method, for example, those shown in FIGS. 13 and 14 are known.

The cylindrical wall body shown in FIG.
Main walls 2 and 2 having a C-shaped cross section and an inverted C-shaped cross section are constructed by connecting the segments 1, and branch RC segments 3 and 4 are connected between the upper and lower ends of these main walls 2. A middle pillar (made of RC) 5 is installed between the upper and lower branch RC segments 3 and 4, and the eyeglass frame-shaped walls thus constructed are successively connected in the axial direction of the excavated hole. It is something.

RC segment 11 branch part RC that constitutes this cylindrical wall body
The segments 3, 4 and the center column 5 are connected by bolts and nuts, and a plurality of joint fittings 6 in which port insertion holes 6a are formed are embedded in each of the above-mentioned members as connection parts by bolts and nuts.

In addition, a branch part RC connecting the upper and lower parts of the left and right main wall parts 2 and 2
In the illustrated example, the segments 3 and 4 are made of concrete and are integrally molded into a Y-shaped exterior. A base 3c with a square cross section that is connected to the pillar 5, and connecting arms 3a and 3b with a square cross section that are branched from the base 3c and whose respective end faces are connected to the main walls 2, 2.
It has a basic structure consisting of.

On the other hand, the lower branch RC segment 4 basically has its end face 5 as the middle pillar 5, similar to the upper branch RC segment 3.
The basic structure consists of a base 4c with a rectangular cross section connected to the base 4c, and connecting arms 4a and 4b with a rectangular cross section branching from the base 4C and having their respective end faces connected to the main wall parts 2 and 2. . However, the two connecting arms 4a and 4b of the lower branch RC segment 4 are both longer than the connecting arms 3a and 3b of the upper branch RC segment 3,
By alternately using two large and small branch RC segments 3 and 4 in the axial direction of the cylindrical wall, segments 1 and 3,
4 are arranged in a staggered manner.

On the other hand, the cylindrical wall body shown in Fig. 14 is used for excavation holes in the form of vertically continuous circles, and basically, like the cylindrical wall body shown in Fig. 13, it has an arc plate shape. RC segment 1
are connected to construct earthen walls 2, 2 with a C-shaped cross section and an inverted C-shaped cross section.In this example, these main walls 2 are placed above and below the excavation hole, and their The branch RC segments 3 and 4 are connected between the left end and the right end, and a floor slab 7 is built between the left and right branch RC segments 3 and 4, and the upper and lower two series constructed in this way are The feature is that the eyeglass frame-shaped walls are successively connected in the axial direction of the excavated hole.

In this example, the bases 3c and 4c of the branch RC segments 3 and 4 are respectively formed with protruding step portions 3d and 4d on which the floor slab 5 is placed, and the floor slab that partitions the upper and lower main walls 2 and 2. 7 was designed to be easily installed.

``Problem to be solved by the invention'' By the way, at present, the lining of the above-mentioned double-hole drilled hole has entered the stage of practical use, and the number of linings will continue to increase in the future. Regarding the cylindrical wall for lining a shaped excavated hole, the following problems remain to be solved.

Firstly, in the construction of a conventional lining tubular wall,
Although it is necessary to erect the middle pillar 5 or floor slab 7 between the branch segments 3 and 4, these middle pillars 5 or floor slab 7 are larger than the segments that make up the cylindrical wall. Therefore, the assembly work is time consuming.

Second, in the conventional cylindrical wall body, between the segments l forming the main wall parts 2 and 2, the branch parts segments 3 and 4 have a Y-shaped appearance.
Due to the structure in which the middle pillar 5 is positioned between the branch segments 3 and 4, positional accuracy of the branch segments 3 and 4 is required, and as a result, their assembly work becomes difficult. be.

Moreover, the branch portion segments 3 and 4 are connected to the connecting arm portions 3a and 3.
b, 4a and 4b and bases 3c and 4c, segments l and 1
Due to the structure in which the members such as the middle pillar 5 and the floor slab 7 are connected, the branch segments 3 and 4 themselves must have good dimensional accuracy, which poses a problem of high cost.

This invention was made in view of the above circumstances, and its purpose is to provide a cover for excavated holes that can be easily constructed on site, improve work efficiency, and reduce costs. An object of the present invention is to provide a cylindrical wall body for industrial use.

"Means for Solving the Problems" To achieve the above object, the present invention has a configuration in which two excavated holes each having a circular cross section are partially overlapped vertically or horizontally through a common opening. A cylindrical wall body for lining one of the double drilled holes, which is formed as if by chance, and the main wall is assembled into a cylindrical shape for lining one of the double drilled holes. and an auxiliary wall portion whose end face is connected to the outer surface of the main wall portion and lines the other drilled hole of the double drilled hole, and the main wall portion includes a plurality of arc plate-shaped segments; The auxiliary wall is composed of a pair of upper and lower branch segments having connecting arms connected to the end surfaces of the auxiliary wall on the outer surface, and the auxiliary wall is a cylinder having an opening in the axial direction by a plurality of arcuate segments. It is characterized by being assembled into a shape.

Furthermore, the branch segment and the arcuate segment located at the end of the auxiliary wall can be easily connected by integrally joining them with bolts that pass through the front and back of the branch segment.

"Function" To construct this tubular wall for lining, first, a circular arc plate-like segment and a branch segment with a connecting arm are combined and connected in the length direction to form a cylindrical wall. While a main wall portion having a shape of a shape is formed, an auxiliary wall portion is formed by assembling arcuate plate-like segments from connecting arms of branch segments of this main wall portion.

This constitutes one unit of the cylindrical wall body in the shape of a spectacle frame, so each time the shield machine excavates, the positions of the main wall part and the auxiliary wall part are alternately changed and the unit is bolted in the axial direction. The cylindrical wall body may be extended in the length direction of the excavation hole while being connected.

This lining cylindrical wall has a main wall formed into a cylindrical shape by a combination of segments and branch segments, and a cylindrical auxiliary wall having an opening in the axial direction on the outer surface of the main wall. , it is possible to simplify the structure of the inner wall portion and to ensure the transmission of stress.

In addition, in this lining cylindrical wall, the earthen wall and the auxiliary wall are integrated via the branch segment that constitutes the cylindrical main wall, so the cylindrical wall It becomes possible to improve the overall proof strength.

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In addition, this first embodiment is a cylindrical wall body for lining the inside of a double drilled hole formed by two drilled holes each having a circular cross section so that their side portions overlap each other from side to side. shows an example to which this invention is applied.

As shown in Figures 1 to 3, this lining cylindrical wall body has a main wall part lO assembled in a cylindrical shape for lining one of the two drilled holes. , this main wall lO
It is mainly composed of an auxiliary wall part 11 whose end face is connected to the outer surface of the auxiliary wall part 11 for lining the other of the double-drilled holes.

The main wall 1O has a plurality of RC segments 12 formed in an arc shape with a constant curvature in the longitudinal direction, and a connecting arm 13a to which the end surface of the auxiliary wall 11 is connected to the outer surface. The upper and lower branch RC segments 13 are connected to bolts via joint fittings 6 buried in their end faces.
It is fastened into a cylindrical shape with a nut, and is the main type of structure! ! The sections 10 are arranged every other along the longitudinal direction of the lining cylindrical wall, and the auxiliary wall 11 is sandwiched between the main wall sections 10 to form a spectacle frame-shaped cylindrical wall. It is a built structure. Note that between the RC segments 12, there is a key segment l- whose side surface is formed into a tapered shape.
12A is incorporated, and consideration is given so that each segment 12, 13, etc. can be easily attached from the inside of the main Wl section 10.

In addition, bolt insertion holes 6a are provided on both sides of each RC segment l2 as connection parts using bolts and nuts as in the past.
A joint fitting 6 formed with... is buried therein.

On the other hand, one set of upper and lower branch portions RC constituting the main wall portion 10
Basically, the segment l3 has the same structure above and below, and specifically, the entire segment l3 is an RC segment l3.
The segment main body 13b has an arcuate shape with the same radius of curvature as 2, and the connecting arm 13a has a rectangular cross section and is formed to protrude from the outer surface of the segment main body 13b and whose end face is connected to the auxiliary wall 11. It is configured as.

As shown in FIGS. 4 and 5, the segment body 13
A plurality of joint fittings 6 are embedded in each of the four joining end faces, which are the upper and lower sides and the left and right sides of b, and each of these joint fittings 6 are connected to each other using bolts and nuts. It is designed to be connected to the opposing joint fittings 6 of the RC segment l2. Further, a pair of left and right bolt insertion holes 13c are formed in the end surface of the connecting arm portion 13a of the branch RC segment l3, which communicate with the end surface and the inner surface of the branch RC segment 13, and further,
A fixing portion 13d for fixing the fastening bolt 15 is provided at the opening of the bolt insertion hole 13c on the inner surface side of the branch RC segment 13.

On the other hand, to explain the auxiliary wall l1 whose end face is connected to the outer surface of the main wall lO and lines the other drilled hole of the double drilled hole, this auxiliary wall l1 has a constant curvature in the longitudinal direction. It is formed into a cylindrical shape having an opening along the axis line by a plurality of RC segments l2... formed in an arcuate shape with a key segment 12A having a tapered side surface. The structure is as follows.

In order to join the main wall part 10 and the auxiliary wall part 11, as shown in FIGS. 4 and 5, insert the bolt I; 1
5, the RC segment l located at the end of the auxiliary wall portion 1l
This is done by screwing into the joint fitting 6 of No. 2 through the nut l6 and tightening it.

Next, the function of the tubular wall for lining constructed as described above will be explained along with its construction method.

In order to assemble the above-mentioned cylindrical wall, first, the arc-shaped R
By combining the C segment 12 and the branch RC segment l3 and connecting them in the length direction, a cylindrical main wall part lO is formed, while this main wall part 1
The arc-shaped RC segment 12 is assembled from the connecting arm 13a of the branch RC segment 13 assembled to 0 to form the auxiliary wall 11.

Note that the RC segment l located at the end of the auxiliary wall l1
2 and the branch RC segment 13, as described above, the branch RC segment 1 is inserted into the bolt insertion hole 13c penetrating the connecting arm 13a of the branch RC segment 13.
Insert port 15 from the inner surface of 3, and connect RC segment l2.
Attach nut 1 to bolt 15 protruding from fitting 6 on the end face of
Screw in 6 to connect.

This constitutes one unit of the cylindrical wall in the shape of a mirror frame, so each time the shield machine excavates, the main wall 10
The cylindrical wall body may be extended in the length direction of the excavated hole while the units are bolted together in the axial direction by alternating the positions of the auxiliary wall portion 11 and the auxiliary wall portion 11 on the left and right sides.

In this construction, first, while arranging the RC segments 12 from below the cylindrical wall, a set of branch RC segments l
3, and further connects the RC segment l2 located above the excavation hole to this branch part RC segment l3 to construct a seven-cylindrical earth wall part 10, while the connecting arm part 13a of the branch part RC segment 13 Arc-shaped RC based on
It is a simple task to connect the segment 12 and construct the auxiliary wall 1l, and also change the direction of the connecting arm 13a in the axial direction of the tonnage to create the branch RC segment! -13
By arranging the upper and lower parts in sequence in the axial direction, the RC segments 12 and the like can be easily assembled in a staggered manner, which has the advantage of improving workability.

In addition, when constructing the cylindrical wall, the right and left sides of the branch RC segment 13 are exchanged, and the eyeglass frame-shaped cylindrical wall is constructed one unit at a time, so that the central part of the cylindrical wall is An opening is formed that connects the inside of the main wall part 10 and the inside of the auxiliary wall part l1, and it is possible to move between them, and as a result, the workability inside the cylindrical wall body is not impaired. do not have.

Therefore, in the lining cylindrical wall body configured in this way, the main wall portion 10 is formed into a cylindrical shape by a combination of the RC segment 12 and the branched portion RC segment 13,
Since the cylindrical auxiliary wall portion l1 having an opening in the axial direction is assembled on the outer surface of the main wall portion 10, it is possible to simplify the structure of the inner wall portion and to ensure the transmission of stress. It becomes possible.

Moreover, in this lining cylindrical wall, the main wall 10 and the auxiliary wall 11 are integrated via the branch segment l3 that constitutes the cylindrical main wall 10. There is also the advantage that it becomes possible to improve the proof strength of the cylindrical wall as a whole.

In the above-mentioned first embodiment, the arc-shaped segment and the branch segment are made of RC, but they can also be made of steel, and hereinafter, such a second embodiment of the present invention will be described. will be explained with reference to FIGS. 6 to 12.

As shown in FIGS. 6 to 8, the lining tubular wall body of the second embodiment has a main wall portion 20 similar to that of the first embodiment.
and an auxiliary wall portion 2l.

The main wall portion 20 includes a plurality of arc-shaped steel segments 22
..., and the key segment 22A is cylindrically connected to the upper and lower IJfl branch steel segments 23, which have connecting arms 23a connected to the end surfaces of the auxiliary wall 2l on their outer surfaces, and the main wall 20 is The auxiliary walls 2l are arranged every other time along the direction of the opening of the lining cylindrical walls, and the auxiliary walls 2l are sandwiched between the main walls 20 to construct a spectacle frame-shaped cylindrical wall. It has a similar structure.

As shown in FIG. 9(A), the steel segment 22 (including the key segment 22A) has a pair of arc-shaped main girders 22a facing each other, and a pair of arcuate main girders 22a at both ends of these main girders 22a. A welded joint plate 22b, a skin plate 22c welded to the outer periphery of the arcuate rectangular body formed by the main girder 22a and the joint plate 22b, and a joint plate 22b welded to the inner peripheral surface of the skin plate 22C. and a plurality of ribs 22d extending in the same direction.

An appropriate number of bolt insertion holes 22e are formed at equal pitches in each of the main girders 22a and each joint plate 22b, and the steel segments 22 are bolted to each other by bolts inserted through these bolt insertion holes 22e.

On the other hand, the upper and lower branch steel segments 23 that constitute the main wall 20 are entirely covered with steel segments 22.
Segment body 2 in the shape of a circular arc with the same radius of curvature as
4, and a connecting arm 25 with a square cross section that projects from the outer surface of the segment main body 24 and whose end face is connected to the auxiliary wall 2l.

This branch steel segment 23 is similar to the steel segment 22, and as shown in FIG. Arc-shaped main girders 23a, joint plates 23b welded to both ends of these main girders 23a,
A skin plate 23c is welded to the outer periphery of the arcuate rectangular body formed by the main girder 23a and the joint plate 23b, and a joint plate 23 is welded to the inner peripheral surface of the skin grate 23c.
It is composed of a plurality of ribs 23d extending in the same direction as b,
An appropriate number of bolt insertion holes 23e for bolt connection are formed in each main girder 23a and each joint plate 23b at equal pitches.

And what about this branch steel segment 23? As shown in FIGS. 11 and 12, a bolt insertion hole 22e of the joint plate 22b of the steel segment 23 is provided in the end surface of the connecting arm portion 25 of the metal plate 23c.
A pair of left and right bolt insertion holes 23e corresponding to the
By bolting the skin plate 23c and the joint plate 22b, the steel segment 22 and the branch steel segment 23 are connected.

On the other hand, the auxiliary wall portion 2l has the above-mentioned main wall portion 20 tlt
A plurality of circular arc plate-shaped steel segments 22...,
and the key segment 22A, it is formed into a cylindrical shape having an opening along the axial direction.

To assemble the lining cylindrical wall body constructed as described above, first, the steel segments 22 and the branch steel segments 23 are combined and connected in the length direction to form the cylindrical main wall. While forming 20;
The steel segment 22 is assembled to the connecting arm 25 of the branch steel segment 23 assembled to the main wall 20 to form the auxiliary wall 2l.

Note that the connection between the steel segment 22 located at the end of the auxiliary wall portion 21 and the branch steel segment 23 is made through the joint between the end surface of the connecting arm portion 25 of the branch steel segment 23 and the steel segment 22, as described above. Board 22b
The bolt insertion holes 22e and 23e of both are aligned, the fastening port 27 is inserted here, and the nut 28 is screwed in to fasten.

Note that the cylindrical wall body for lining in the above two embodiments is an example in which it is applied to a left and right duplex type, but the present invention is not limited to each of the above embodiments, and is applied to a top and bottom duplex type. Needless to say, it can be applied to things as well.

"Effects of the Invention" As explained above, the cylindrical wall body for lining according to the present invention has a configuration in which two excavated holes each having a circular cross section are partially overlapped vertically or horizontally through a common opening. A cylindrical wall body for lining one of the double drilled holes, the main wall being assembled into a cylindrical shape for lining one of the double drilled holes. and an auxiliary wall portion whose end face is connected to the outer surface of the main wall portion and lines the other drilled hole of the double drilled hole, and the main wall portion includes a plurality of arc plate-shaped segments; The auxiliary wall is composed of a pair of upper and lower branch segments having connecting arms connected to the end surfaces of the auxiliary wall on the outer surface, and the auxiliary wall is a cylinder having an opening in the axial direction by a plurality of arcuate segments. Since it is characterized by being assembled into a shape, it has the following excellent effects.

(a) To construct this cylindrical wall body for lining, first, a cylindrical wall body is constructed by combining arc plate-like segments and branch segments with connecting arms and connecting them in the length direction. While the main wall is formed, the auxiliary wall is formed by assembling arc-shaped segments from the connecting arms of the branch segments of this earthen wall to form the auxiliary wall. By changing the direction of the parts and arranging the upper and lower branch segments in sequence in the axial direction, the segments can be easily assembled in a staggered manner, which has the advantage of improving workability. .

(b) The earthen wall is formed into a cylindrical shape by a combination of arcuate segments and branch segments, and a cylindrical auxiliary wall having an opening in the axial direction is assembled on the outer surface of this main wall. The structure of the wall portion can be simplified and stress can be transmitted reliably.

(c) Since the earthen wall and the auxiliary wall are integrated through the branch segments that constitute the cylindrical main wall, it is possible to improve the strength of the cylindrical wall as a whole. .

(d) By fastening the branch RC segment and the arc plate-shaped segment located at the end of the auxiliary wall unit together with bolts that pass through the front and back of the branch segment, it is possible to easily connect them. This has the advantage of facilitating workability on site.

(e) The above can contribute to the development of multiple shield tunnels.

[Brief explanation of the drawing]

1 to 5 are views showing a first embodiment of the present invention, in which FIG. 1 is a perspective view showing a state in which a tubular wall for lining is constructed, and FIGS. 2 and 3 are respectively A front view shown to explain the action, FIG. 4 is a sectional view showing the connection structure between the branch RC segment and the auxiliary wall, and FIG.
The v-line arrow view and FIGS. 6 to 12 are views showing a second embodiment of the present invention, FIG. 6 is a perspective view showing a state in which the lining cylindrical wall body is constructed, and FIG. and Fig. 8 are front views shown to explain the action, Fig. 9 (a) (opening) are perspective views showing the back and front sides of the steel segment, respectively, and Fig. 10 (a) (opening) are respectively A perspective view showing the front side of the back side of the branch steel segment, Fig. 11 is a sectional view showing the connection structure between the branch steel segment and the auxiliary wall, and Fig. 12 is a view taken along the line 1 in Fig. 11. It is. Moreover, FIG. 13 and FIG. 14 show an example of the structure of a cylindrical wall body for lining, and are a front view showing the body and a front view showing the body. Fig. 13 shows two horizontal cylindrical walls 4 Fig. 13 shows two vertical cylindrical walls 0, 20...Main wall part, 1, 2l...Auxiliary wall part, 2 ...RC segment, 3... Branch segment, 3a, 25... Connection arm, 5, 27... Bolt, 6, 28... ... Nut, 2 ... Steel segment, 3 ... Branch steel segment.

Claims (2)

[Claims] (1) A cylindrical wall for lining a double-shaped excavated hole formed by connecting two excavated holes with circular cross-sections through a common opening so that parts of the holes are overlapped vertically or horizontally. The body includes a main wall assembled in a cylindrical shape for lining one of the two drilled holes, and an end surface connected to the outer surface of this main wall to line one of the two drilled holes. and an auxiliary wall for lining the other excavated hole, and the main wall has a plurality of arc plate-like segments and a pair of upper and lower connecting arms on the outer surface to which the end surfaces of the auxiliary wall are connected. A cylindrical wall body for lining an excavated hole, characterized in that the auxiliary wall part is assembled into a cylindrical shape having an opening in the axial direction by a plurality of arc plate-shaped segments. . (2) In the cylindrical wall body for lining an excavated hole according to claim 1, the branch segment and the arc-shaped segment located at the end of the auxiliary wall are connected by a bolt passing through the front and back of the branch segment. A cylindrical wall body for lining an excavation hole characterized by being integrally connected.