JPH0321797A - Tube-form wall body for covering work of excavated hole - Google Patents

Abstract

PURPOSE:To reduce the sorts of segments by providing segments of triangular section and V-shape section alternatively in the axial direction, or providing segments with shortened arc length alternatively in the axial direction, to the central branch of the covering work of an excavated hole of a cocoon form section. CONSTITUTION:A short arm branch segment 10 of a trigonal prism form is formed, its both side surfaces are connected to the end surfaces of circular arc plate form segments 4, and its lower surface is connected to one end of a middle pillar 3 respectively. Then, a large arm branch segment 14 of a V- shape pillar form is formed, its both side surfaces are connected to the end surfaces of the segments 4, and its upper surface is connected to the other end of the pillar 3. Then, the segments 10 and 14 are arranged alternatively in the axial direction, and the segments 4 are arranged zigzag. In this case, the normal segments 4 are cut obliquely to form cut branch segments 18, and they may be lined up alternatively laterally in the axial direction. Consequently, a zigzag lineup can be made without using key segments, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cylindrical wall body for lining an excavation hole, which is applied to lining a double excavation hole.

"Prior Art" In recent years, a method called a 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 unrud excavators are connected, to excavate the ground or ground into a cocoon-shaped cross-sectional shape in which two circles partially overlap. The segments are assembled on the inner surface of the excavated hole to form a cylindrical wall, and a plurality of these cylindrical walls are connected along the hole (primary lining), and the back surface of the segment of this primary lining is In other words, after filling the gap between the segment and the ground with an injection material, concrete is rolled around the inner surface of the primary lining (secondary lining), supporting the ground and filling the predetermined inner void. It is said that it constitutes.

Examples of such conventional lining cylindrical bodies include:
The one shown in FIG. 10 is known.

This lining cylindrical wall body is formed along an excavated hole having a cocoon-shaped cross-sectional shape in which the two circles are horizontally connected and partially overlap each other. Among the above two circles, there is a main wall 1a formed inside the circle perpendicular to the axial direction of the excavation hole, a main wall lb formed inside the circle on the other side, and these main walls. The general structure consists of a branch segment 2 that connects the upper end and the lower end of the parts 1a and 1b, and a middle pillar 3 that is provided between the upper and lower two branch segments 2, 2. It is something that has been torn down.

The main wall portions 1a, lb are composed of a circular arc plate segment 4 which is an arc plate shaped RC segment, and a key segment 5 which is a circular arc plate shaped RC segment which is slightly shorter than the circular arc plate segment 4. , two C-shaped segments formed by connecting the longitudinal end surfaces of the plurality of arcuate plate segments 4 and one key segment 5 with bolts and nuts.
1 span) are arranged on a plane perpendicular to the axial direction of the excavation hole so that the openings of the C-shaped coupling bodies 6 face each other, and the two coupling bodies 6, 6 arranged in this way are are sequentially arranged in the axial direction of the excavated hole, and the side surfaces of the adjacent connecting bodies 6 are each attached with bolts and holes. , and are formed by connecting them.

The branch segment 2 has a generally Y-shaped appearance and includes two short arms 7, 7 connected to the connecting body 6, and a base 8 connected to the middle pillar 3. The arms 7, 7 are connected to bolts and nuts with the openings facing each other and the upper end surfaces of the two connecting bodies 6, 6 facing each other, and the bases facing inside the lining wall. are connected by.

Further, the connecting bodies 6, 6 are similarly arranged and connected between the lower end surfaces of the connecting bodies 6, 6.

The middle pillar 3 has a prismatic shape with both ends slightly thickened in the longitudinal direction, and has a branch segment 2 disposed between the upper end faces of the connecting bodies 6 and 6, and a lower side of the connecting bodies 6 and 6. The branch segment 2 is disposed between the end faces of the branch segment 2, and the branch segment 2 is connected to the end face of the base 8 of each branch segment 2 with bolts and nuts.

As described above, the connecting body 6 forming the main walls 1a, lb is composed of a plurality of arcuate plate-like segments 4 and one key segment 5 that is slightly shorter than the arcuate plate-like segments 4. However, due to the position of the key segment 5 in the above-mentioned connecting body 6, (1) the key segment 5 is provided adjacent to the branch segment 2 disposed on the upper side of the cylindrical wall.

(2) The key segment 5 is provided adjacent to the branch segment 2 located below the cylindrical wall.

There are two types of connecting bodies 6, and by disposing these two types of connecting bodies 6 alternately in the axial direction of the excavation hole, the arcuate plate-shaped segments 4 are arranged in a staggered manner in the main walls la and 1b. ing.

The reason why the arcuate plate segments 4 are arranged in a staggered manner in the main wall portions 1 a and 1 b is that if they are not arranged in a staggered manner, the arcuate plate segments 4 will be disposed in a staggered manner.
The connecting surfaces at the longitudinal ends of the holes, that is, the connecting surfaces parallel to the axial direction of the excavated hole, now exist on one plane, causing problems in terms of the connecting strength of the lining cylindrical wall. This is because the stability of the cylindrical wall decreases.

"Problem to be Solved by the Invention" However, in order to arrange the arcuate plate segments 4 in a staggered manner, the arcuate plate-like key segments 5, which are slightly shorter than the arcuate plate segments 4, are required as described above. For this reason, there is a problem in that the types of arcuate plate-shaped segments manufactured in factories and the like increase, which increases manufacturing costs.

Furthermore, when the number of types of arcuate plate segments increases, inconveniences such as incorrect attachment of the arcuate plate segments may occur at the construction site.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a cylindrical wall body for lining an excavated hole, in which arc plate-like segments can be assembled in a staggered manner without using key segments. It is something to do.

"Means for Solving the Problem" According to claim 1 of the present invention, the branch segments include a short short arm branch segment of an arm connected to an arcuate plate segment, and an arm segment connected to the short arm branch segment. Two different types of branch segments are used, and a long arm branch segment with a long length is used. , and further, when the branch segments are connected in the axial direction, these two types of branch segments are arranged in a row alternately, and the two types of branch segments arranged in this way are provided with the above circular arc. By connecting the plate segments, the above problem is solved by a cylindrical wall body for lining an excavation hole in which arc plate segments are arranged in a staggered manner.

Further, in claim 2 of the present invention, a cut branch segment obtained by cutting an arcuate plate-like segment along a plane perpendicular to the longitudinal direction thereof is used as the branch segment, and the cut surface of the cut branch segment is The upper end surface and the lower end surface are joined to each other so that the connecting end surfaces, which are the end surfaces opposite to the cut surface, face different main wall sides, and when the cut branch segments are connected in the axial direction, this cut The connecting end surfaces of the branch segments are arranged so as to be connected alternately to one main wall side and the other main wall side, and the above-mentioned arc plate-shaped The above problem is solved by a cylindrical wall body for lining an excavation hole in which arcuate plate-like segments are arranged in a staggered manner by connecting the segments.

"Function" According to the tubular wall body for lining according to claim 1 of the present invention, a short arm branch segment having a short arm part and a long arm branch part having a longer arm length than the short arm branch segment. Two different types of bifurcation segments are connected to the upper and lower ends of the middle column, respectively, and the two types of bifurcation segments are alternately connected when the bifurcation segments are connected in the axial direction. By joining the arcuate plate segment to the above two types of branch segments, the arcuate plate segment always has the same length of the arms of the two branch segments as the other axially adjacent arcuate plate segments. They are placed offset by the difference in height. Therefore, it is possible to assemble the arcuate plate segments in a staggered manner.

Further, according to the lining tubular wall body according to claim 2, when the cut surfaces of the cut branch segments are connected to both end surfaces of the central column, the connecting end surfaces are directed to different main wall portion sides. Further, when the cutting branch segments are connected in the axial direction, the cutting branch segments are arranged such that the connecting end surfaces are alternately connected to the end surfaces of the two main walls. Due to the connection, the arcuate plate segment is always offset from another axially adjacent arcuate plate segment by the length of the cutting branch segment. Therefore, it becomes possible to assemble the arcuate plate-like segments in a staggered manner.

"Example" Hereinafter, the cylindrical wall body for lining an excavated hole according to the present invention will be described in detail using an example.

First, an example of a cylindrical wall body for lining an excavated hole according to claim 1 will be explained with reference to FIGS. 1 to 4.

This lining cylindrical wall body differs from the conventional lining cylindrical wall body described above in that two types of branch segments having different shapes are used as the branch segments.

Of the two types of branch segments having different shapes, the short arm branch segment will be described with reference to FIG. 1.

This short arm branch segment I-10 has a triangular prism shape, and a plurality of joint fittings 1l are embedded in each of the triangular sides of both end faces thereof. The three rectangular side surfaces of the short arm branch segment 10 are composed of two segment connections 12, 12 of equal size and a middle column connection 13, and the segment connection surface 12 includes:
The end faces of the arcuate plate segments 4 constituting the main wall are connected, and the end faces of the middle pillar 3 are connected to the middle pillar connecting surface 13.

Next, the arm bifurcation segment will be explained using FIG. 2.

The long arm branch segment I4 has a substantially V-shaped side surface, and has arm parts 16 connected to a base 15 having the same shape as the short arm branch segment 10. It is something. A plurality of fittings 11 are embedded in the end face of the base 15 and the end faces of the arm parts 16, 16, and the end face of the center column 3 is connected to the end face of the base 15, and The end faces of the arcuate plate segments 4 are connected.

A cylindrical wall for lining an excavation hole constructed using the short arm branch segment IO and the long arm branch segment 14 will be described with reference to FIGS. 3 and 4.

The short arm branch segment lO and the long arm branch segment l4 are arranged so that different types of branch segments are coupled when coupled to the upper end surface and lower end surface of one middle column 3, respectively. Furthermore, when these branch segments are coupled in the axial direction, the short arm branch segments 10 and the long arm branch segments 14 are arranged so as to be coupled alternately. By connecting the longitudinal end faces of the arcuate plate-like segments 4 to these branch segments arranged in this way, the arcuate plate-like segments 4 adjacent in the axial direction in the main walls 1 a, 1 b are disposed and connected by the length of the arm portion 16 of the long arm branch segment }14 in the longitudinal direction. As a result, in the main wall portions 1a and 1b,
It becomes possible to assemble the arcuate plate segments 4 in a staggered manner without using key segments.

Further, other examples of short arm bifurcation segments will be explained using FIGS. 7 and 8.

Reference numeral 24 in the figure indicates a combined short arm bifurcation segment, which is another example of the short arm bifurcation segment. This connected short arm branch segment 24 is an end obtained by cutting the end of the middle column 3 parallel to the end surface of the middle column 3 on the middle column connecting surface 13 of the triangular prism-shaped short arm branch segment 10. A short medium column 26 having a shape obtained by removing the end portion 25 from the middle column 3 is attached to the end surface of the end portion 25 opposite to the end surface on the short arm branch segment lO side. It is connected to the cut end face. The arcuate plate-shaped segment 4 is connected to the segment connection surface l2.

This combined short arm branch segment 24 is used together with the long arm branch segment }14 in the same way as the triangular prism-shaped short arm branch segment 10, and the arcuate plate segments 4 can be assembled in a staggered manner.

Next, the cylindrical wall body for lining an excavated hole according to claim 2 will be explained using FIGS. 7 to 9.

This lining cylindrical wall body differs from the conventional lining cylindrical wall body described above in that a cut branch segment formed by cutting an arcuate plate segment is used as the branch segment. .

This cutting branch segment will be explained using FIG. 7.

Reference numeral 18 in the figure indicates a cutting branch segment. This cutting branch segment l8 is a normal circular arc plate segment 4 that is perpendicular to its longitudinal direction and has a cutting surface 1.
9 is cut to form an angle of approximately 60° with the outer peripheral surface of the arcuate plate-like segment 4, and near the cut surface of the outer peripheral surface, the arcuate plate-like segment 4 constituting the main wall portion is formed. A connecting plane 2l is formed to connect with the end face of the connecting plate. The angle between the cut surface 19 and the outer circumferential surface of the cut branch segment 18 is selected as appropriate depending on the shape of the cylindrical wall and the like. Further, the cut surface 19 includes a joint fitting 11.
is buried, and this allows the end face of the center column 3 to connect with the bolt.
Connected by nuts. The connecting end surface 20, which is the end surface opposite to the cut surface l9, has two main walls 1 a,
The end faces of the arcuate plate-like segments 4 constituting one main wall 1a of the main wall 1a of the cutting branch segment 18 are connected to each other, and a connecting point provided on the outer circumferential surface of the cutting branch segment 18 near the cut surface 19 21 is connected to the end face of the arcuate plate-shaped segment 4 that constitutes the other main wall portion 1b. The connecting body 2l of this cutting branch segment l8 and the main wall part tb
The end face of the side arc plate-shaped segment 4 is defined as one end of a bolt 23 inserted into a through hole 22 provided between the inner peripheral surface of the cutting branch segment 18 and the connecting plane 2l. They are connected by tightening a nut at a joint fitting 11 embedded in the end face of the arcuate plate-shaped segment 4 disposed at.

A cylindrical wall body for lining an excavated hole using this cutting branch segment 18 will be explained with reference to FIGS. 8 and 9.

The cutting branch segment l8 is arranged so that the connecting end surface 20 is connected to a different main wall side when the cutting branch segment l8 is connected to the upper end surface and the lower end surface of one central pillar 3, and When the branch segments 18 are connected in series in the axial direction, the connecting end surfaces 20 are alternately connected to the end surface of the connecting body I7 on the main wall portion 1a side and the end surface of the connecting body I7 on the main wall portion 1b side. It is arranged so that By connecting the longitudinal end surface of the arcuate plate-shaped segment 4 to the connecting end surface 20 and the connecting plane 2l of the cutting branch segment l8 arranged in this way, the main wall portion las l b is axially Adjacent arcuate plate-like segments 4 are arranged and connected by being shifted by the length of the cutting branch segment 18 in the longitudinal direction.

This makes it possible to assemble the arcuate plate segments 4 in a staggered manner in the main wall portions 1a, 1b without using key segments.

In addition, since this cut branch segment 18 uses the cut product of the arcuate plate segment 4 as its main component, it can be manufactured at a lower cost than a normal branch segment.

In the above embodiments, the cylindrical wall for lining an excavation hole made of RC segments has been described, but the present invention is not limited to this, and the present invention is not limited to this, and the present invention is not limited to this. It is also suitably used for a cylindrical wall for lining.

In the above embodiments, the cylindrical wall for lining an excavation hole made of RC segments has been described, but the present invention is not limited to this, and the present invention is not limited to this, and the present invention is not limited to this. It is also suitably used for a cylindrical wall for lining.

"Effects of the Invention" According to the tubular wall body for lining according to claim 1 of the present invention, the short arm branch segment has a short arm, and the long arm has a longer arm length than the short arm branch segment. Two different types of bifurcation segments are connected to the upper and lower ends of the middle column, respectively, and the two types of bifurcation segments are alternately connected when the bifurcation segments are axially connected. By combining the two types of branch segments connected to each other, the arc plate segment always has the difference in arm length between the two branch segments with the other axially adjacent arc plate segments. The location is shifted by the amount of . Therefore, it is possible to assemble the arcuate plate segments in a staggered manner.

Further, according to the lining tubular wall body according to claim 2, when the cut surfaces of the cut branch segments are connected to both end surfaces of the central column, the connecting end surfaces are directed to different main wall portion sides. Further, when the cutting branch segments are connected in the axial direction, arcuate plate-like segments are connected to the cutting branch segments arranged so that the connecting end faces are alternately connected to the end faces of the two main walls. Due to the coupling, the arcuate plate segment is always offset from another axially adjacent arcuate plate segment by the length of the cutting branch segment. Therefore, it becomes possible to assemble the arcuate plate-like segments in a staggered manner.

That is, according to the cylindrical wall body for lining an excavated hole of the present invention,
Arc plate-like segments can be created without using key segments.
Since it is possible to assemble the segments in a staggered manner, it is possible to reduce the number of types of segments.

This reduction in the number of types of segments leads to a reduction in costs, and since only one type of arcuate plate segment is required at the site, there is no inconvenience such as incorrect installation of the arcuate plate segment. have

[Brief explanation of the drawing]

1 and 2 are schematic perspective views showing a branch segment used in an example of the cylindrical wall body for lining an excavated hole according to the present invention, and FIG. 3 is a schematic front view showing an example of the present invention. 4 is a schematic perspective view showing an example of the present invention, FIG. 5 is a schematic perspective view showing another example of the bifurcation segment in FIG. 1, and FIG. 6 is a schematic perspective view showing another example of the bifurcation segment in FIG. 7 is a schematic sectional view showing a branch segment used in another example of the present invention; FIG. 8 is a schematic front view showing another example of the present invention; FIG. Similarly, FIG. 9 is a schematic perspective view showing another example of the present invention, and FIG. 10 is a schematic front view showing a conventional cylindrical wall body for lining an excavated hole. Figure 1: Main wall, branch segment, 3: arc plate segment, short arm branch segment, long arm branch segment, cut branch segment, 20: connecting end surface. l a, 1 b 2 ... 4 ... 10 ... l 4 ... 1 8 ... l 9 ... Middle pillar, Fig. 2

Claims (2)

[Claims] (1) Cross section C consisting of a plurality of arcuate plate segments assembled along the circumferential wall of two drill holes with circular cross-sections that partially overlap each other.
A main wall portion having an inverted C-shaped cross section, a branch segment connecting the upper and lower ends thereof, a branch segment connected to the upper end portion, and a branch portion connected to the lower end portion. In the cylindrical wall body for lining an excavation hole, which is composed of a middle column connecting the segments, the branch segment includes a short short arm branch segment of an arm connected to the arc plate segment, and the short arm. Two different types of bifurcation segments, a long arm bifurcation segment whose arm is longer than the bifurcation segment, are used, and these two different types of bifurcation segments are placed on the upper and lower end surfaces of the middle column, Different types of bifurcation segments are arranged, and further, when the bifurcation segments are connected in the axial direction, these two types of bifurcation segments are arranged alternately, and the two types of bifurcation segments arranged in this way are A cylindrical wall body for lining an excavated hole, characterized in that the arcuate plate-like segments are assembled in a staggered manner by connecting the arcuate plate-like segments to the branch segment. (2) Cross section C consisting of a plurality of arcuate plate segments assembled along the circumferential wall of two drill holes with circular cross-sections, with some of them overlapping each other.
A main wall portion having an inverted C-shaped cross section, a branch segment connecting the upper and lower ends thereof, a branch segment connected to the upper end portion, and a branch portion connected to the lower end portion. In the cylindrical wall for lining an excavated hole, which is composed of a central pillar connecting the segments, the branch segment is a cut branch segment obtained by cutting the arc plate-shaped segment in a plane orthogonal to the longitudinal direction of the segment. , The cut surface of this cut branch segment is connected to the upper end surface and the lower end surface of the central column so that the connecting end surfaces, which are the end surfaces opposite to the cut surface, face different main wall portions, and further, this When the cutting branch segments are connected in the axial direction, the connecting end surfaces of the cutting branch segments are arranged so as to be connected alternately to one main wall side and the other main wall side, and in this way. A cylindrical wall body for lining an excavated hole, characterized in that the arcuate plate-like segments are assembled in a staggered manner by connecting the arcuate plate-like segments to cutting branch segments arranged in the cutting branch segment.