JP4396433B2 - Advanced arch pipe roof construction method - Google Patents

Description

  The present invention relates to a bottom guide shaft advanced arch pipe roof method, and more particularly to a bottom guide shaft advanced arch pipe roof method capable of efficiently constructing a tunnel in a ground where a relatively large amount of groundwater exists.

  Prior to excavation of the tunnel main mine to be constructed, there is known a leading mine advanced method of excavating a small cross-section shaft, and then expanding the tunnel main shaft. There is an advanced construction method in which a guide mine is arranged at the bottom of the cross section of the tunnel main shaft, and an example thereof is described in Non-Patent Document 1 as an advanced construction method for a bottom guide mine.

This advanced underground tunnel construction method is adopted in the ground where there is a lot of spring water, and since the advanced tunnel serves as a drainage pit, after the groundwater level has been lowered to the foundation surface, The excavation of the mine has the advantage that the groundwater level is lowered and drainage is advantageous. However, such a bottom guide shaft advanced construction method has the following technical problems.
"Encyclopedia of Civil Engineering Law Revision V", published by the Industrial Research Council on September 4, 2001, p579

  That is, in the bottom guide shaft advanced construction method described in Non-Patent Document 1, the advanced guide shaft arranged at the bottom in the tunnel direction becomes a drainage shaft, but an advanced guide shaft for draining is simply installed. However, there was a problem that it took time for the groundwater level to drop below the base level, and the construction period was increased accordingly.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a bottom guide shaft advanced arch pipe roof construction method capable of shortening the construction period. .

In order to achieve the above-mentioned object, the present invention has advanced the construction of a bottom guide pit for draining water corresponding to the approximate invert part of the main mine prior to excavation of the tunnel main mine to be constructed. The groundwater is collected and discharged in the guide pit, and from the bottom guide pit, the arch pipe roof having a closed cross section including the arch portion and the invert portion of the main mine and surrounding the entire circumference is tunneled. In an advanced arch pipe roof construction method in which the main mine is constructed by excavating the arch pipe roof and then installing the arch pipe roof , a plurality of the arch pipe roofs are formed from the bottom guide mine. When installing these curved pipes adjacent to each other along the tunnel axis direction, they are installed so as to circulate around the outer periphery of the main mine while being connected to each other via a joint provided on the side surface of each curved pipe. Do Alternatively, the arch pipe roof may be configured such that the spiral pipe body is connected to each other through a joint portion that is fitted to each other at a portion adjacent to the side of the tunnel axis from the inside of the bottom guide pit. Installed so as to circulate the outer periphery of the pit, the curved tube or the spiral tube is composed of a porous tube, installed without filling curable filler inside, and introduced spring water only during the initial period After being filled with the curable filler, the inside of the arch pipe roof is excavated .

  According to the bottom pit advanced arch pipe roof construction method constructed in this way, prior to excavation of the tunnel main mine to be constructed, the bottom pit for draining water is made corresponding to the approximate invert portion of the main mine. Since the groundwater is collected and discharged to the bottom guide shaft, it is possible to reduce the groundwater level to deeper than the tunnel base and eliminate the trouble of spring water when excavating the main shaft.

  Further, in the present invention, a water-permeable arch pipe roof having a closed cross section including the arch portion and the invert portion of the main mine and surrounding the entire circumference is installed along the tunnel axial direction from the bottom guide mine, and thereafter The main pit is constructed by excavating the inside of the arch pipe roof. At the time of excavation of the main pit, the arch pile roof is laid in a closed cross section, so the ground is improved and reinforced in advance and the excavation is performed by stabilizing the face. The safety of work is improved, and the surrounding environment is preserved by suppressing land subsidence. Furthermore, since the work for attaching the arch pile roof, the draining of the bottom guide mine, and the excavation work for the main mine can be performed simultaneously as parallel work, there is no fear of extending the construction period.

  According to the bottom guide shaft advanced arch pipe roof construction method according to the present invention, the drainage and the arch pipe roof can be laid at the invert portion at the same time, so the construction period can be shortened.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 to FIG. 3 show a first embodiment of an advanced arch pipe roof construction method according to the present invention. In the bottom guide shaft advanced arch pipe roof construction method shown in these drawings, first, prior to excavation of the tunnel main shaft 10, as shown in FIG.

  In the case of the present embodiment, the bottom guide shaft 12 has a circular cross section at the top and a concave shape at the lower end side, and a large number of drain holes 13 for collecting water are provided on the outer periphery excluding the bottom surface. The bottom guide mine 12 is arranged so as to correspond to the invert portion of the main mine 10 to be constructed.

  Such a bottom guide mine 12 is constructed by, for example, a shield method, and in the case of the present embodiment, it is constructed such that a part of the lower part protrudes downward from the invert part of the main mine 10. In the bottom guide shaft 12, spring water is taken into the inside through the drain hole 13, and the taken-in water is discharged to the outside, whereby the groundwater level in the ground gradually decreases.

  As shown in FIG. 1, the guide shaft 12 is constructed by a predetermined length, drains the spring water, and lowers the groundwater level. Next, as shown in FIG. A waterproof arch pile roof 14 surrounding the entire circumference is installed.

  In the case of the present embodiment, the arch pile roof 14 has a plurality of curved pipe bodies 16 and a curable filler 18 filled in the curved pipe bodies 16. The curved pipe body 16 is a hollow steel pipe having a circular cross section, as shown in FIG. 2, and a joint portion 20 is provided on the side surface thereof.

  The joint portion 20 includes a concave portion 20a provided on one side surface of the curved tubular body 16 and a convex portion 20b provided on the other side surface, and these are in a shape that can be fitted to each other. In this case, the joint part 20 is in a water-permeable state, for example, by providing it intermittently at a predetermined interval along the longitudinal axis direction of the curved tube body 16.

  The curved pipe body 16 is installed, for example, from a relatively short curved pipe divided into a plurality of annular ones, penetrating through the side wall of the bottom guide pit 12, and on the outside ground mountain side. After projecting, it is formed into an annular shape by sequentially connecting curved tubes to the rear end side, and the front end side is taken into the bottom guide pit 12 again to form a closed section.

  The curved pipe body 16 shown in FIG. 1 is connected to the ends of the bottom guide shaft 12 to form a complete ring shape. However, the curved pipe body 16 has both one end side and the other end side set to the bottom. Since it will be in the completely closed state which covers the outer periphery of the main mine 10 if it exists in the guide shaft 12, it is not necessary to connect edge parts within the guide shaft 12.

  Such a curved pipe body 16 is annularly installed so as to be adjacent to each other along the tunnel axis direction. In this case, the curved tubular bodies 16 adjacent in the tunnel axis direction are arranged in an annular shape while fitting the concave portions 20a and the convex portions 20b of the joint portion 20 with each other.

  In this case, when the first curved pipe body 16 is installed, the subsequent curved pipe body 16 is installed before by fitting the concave portion 20a and the convex portion 20b of the joint portion 20 with each other. It is possible to arrange them in an annular shape in close contact with each other as a guide.

  When a predetermined number of curved tubes 16 are installed, the inside thereof is filled with a curable filler 18, for example, mortar, and is solidified. In the case of the present embodiment, each curved tube 16 is filled with a curable filler 18 to reinforce the rigidity of the curved tube 16, but the filling of the curable filler 18 is, for example, This is not always necessary when the diameter of the curved tube 16 is small or when the wall thickness is large.

Further, in the case of the present embodiment, the curved tube body 16 is configured as a perforated tube, and the curved tube body 16 is used as a water collecting pipe for introducing spring water only during an initial period, and thereafter, the curable filler 18 is filled.

  When the arch pipe roof 14 having a predetermined length is formed by the steps as described above, the interior of the main pit 10 is constructed by excavating the inside thereof as shown in FIG. In the construction of the main mine 10, first, the upper half in the arch pipe roof 14 is excavated and a support is installed on the inner surface of the roof 14, thereby forming the arch portion of the main mine 10. Next, the lower half is excavated and a support is installed in the same manner, and the side wall portion of the main mine 10 is formed so as to be connected to the arch portion.

  Furthermore, the invert part of the main mine 10 is formed by excavating the lower end side of the arch pipe roof 14 and installing a supporting work, whereby the main mine 10 is constructed by a predetermined length. In parallel with the construction work of the main mine 10, the formation work of the arch pipe roof 14 shown in FIG. 1 is performed in advance on the face side, and thereafter the construction work of the main mine 10 is sequentially performed. Then, the formation work of the arch pipe roof 14 is performed, and a desired tunnel is constructed.

  By the way, according to the bottom guide shaft advanced arch pipe roof construction method performed in the above-described process, prior to excavation of the tunnel main shaft 10 to be constructed, water is drained corresponding to the approximate invert portion of the main shaft 10. Since the groundwater is collected and discharged to the bottomhead shaft 12, the groundwater level is lowered to the depth of the tunnel base, and the trouble of spring water during excavation of the main shaft It can be almost eliminated.

  Further, in the present invention, a water-permeable arch pipe roof 14 having a closed cross section including the arch portion and the invert portion of the main pit 10 and surrounding the entire circumference is installed along the tunnel axial direction from the bottom guide pit 12. After that, the main pit 10 is constructed by excavating the inside of the arch pipe roof 14, but when excavating the main pit 10, the arch pile roof 14 is laid in a closed cross section so that the natural ground is improved in advance. Reinforced, the safety of excavation work is improved by stabilizing the face, and the surrounding environment is preserved by suppressing land subsidence.

  Furthermore, since the laying work of the arch pile roof 14, the drainage of the bottom guide pit 12, and the excavation work of the main mine 10 can be performed simultaneously as parallel work, there is no fear of extending the construction period.

  4 and 5 show a second embodiment of the bottom guide shaft advanced arch pipe roof construction method according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof will be given. And only the feature points will be described in detail below.

  In the bottom guide shaft advanced arch pipe roof construction method shown in these drawings, first, prior to excavation of the tunnel main shaft 10a, as shown in FIG. 4, the bottom guide shaft 12a provided with the drain hole 13a is advanced. The

  Similar to the above embodiment, the bottom guide pit 12a is for draining water and is disposed so as to correspond to the invert portion of the main pit 10a to be constructed. The bottom guide pit 12a has a predetermined length. Once constructed, an arch pile roof 14a that includes the arch portion and the invert portion of the main pit 10a, surrounds the entire circumference of the main pit 10a, is closed, and is permeable is installed.

  The arch pile roof 14a has a plurality of curved tube bodies 16a and a curable filler 18a filled in the curved tube body 16a. Unlike the first embodiment, the curved pipe body 16a is not provided with the joint portion 20 on the side surface.

  Similarly to the above embodiment, the curved pipe body 16a penetrates the side wall of the guide shaft 12a and protrudes to the outside natural ground side, and then is taken into the guide shaft 12a again. It is installed in a closed state covering the outer periphery of the. Each curvilinear tube 16a is filled with a curable filler 18a in the same manner as in the above embodiment, and is solidified.

  When the arch pipe roof 14a having a predetermined length is formed by the above-described steps, the inside of the arch pipe roof 14a is excavated to construct the main pit 10a. Thereafter, the same steps as those in the first embodiment are sequentially repeated. Therefore, the second embodiment configured as described above can achieve the same operational effects as the first embodiment.

Also in this embodiment, similarly to the above embodiment, the curved pipe body 16a is configured as a porous pipe, and the curved pipe body 16a is used as a water collecting pipe for introducing spring water only for an initial period, and thereafter, curable filling is performed. The material 18a is filled.

  FIGS. 6 and 7 show a third embodiment of the bottom guide shaft advanced arch pipe roof construction method according to the present invention, and the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be given. And only the feature points will be described in detail below.

  In the bottom guide shaft advanced arch pipe roof construction method shown in these drawings, first, prior to excavation of the tunnel main shaft 10b, the bottom guide shaft 12b is advancedly constructed as shown in FIG. The bottom guide pit 12b is arranged so as to correspond to the invert portion of the main mine 10b to be constructed, and the bottom guide pit 12b is constructed to a predetermined length, as in the above embodiment. An arch pile roof 14b that includes the arch portion and the invert portion of the main mine 10b, surrounds the entire circumference thereof, and is permeable to water in a closed cross section is installed.

  In the case of the present embodiment, the arch pile roof 14b has one spiral tube body 16b and a curable filler 18b filled inside the tube body 16b. As in the first embodiment, the spiral tubular body 16b is provided with a joint portion 20 including a concave portion and a convex portion on the side surface.

  In the same manner as in the above embodiment, the spiral tubular body 16b penetrates the side wall of the bottom guide pit 12b and protrudes to the outside ground, and then is taken into the bottom guide pit 12b again. It is installed in a closed state covering the outer periphery of the main pit 10b.

  The spiral tubular bodies 16b are annularly installed so as to be adjacent to each other along the tunnel axis direction. In this case, the tubular bodies 16b adjacent to each other in the tunnel axis direction mutually connect the concave and convex portions of the joint portion 20. It arrange | positions cyclically | annularly, making it fit. The joint part 20 is provided intermittently along the longitudinal direction, and the space between the pipe bodies 16b is in a water permeable state.

  When the required spiral tubular body 16b is installed, the tubular body 16b is filled with a curable filler 18b and solidified. When the arch pipe roof 14b having a predetermined length is formed by the above process, the inside of the main pipe 10b is constructed by excavating the interior of the arch pipe roof 14b. Thereafter, the same processes as those in the first embodiment are sequentially repeated. Will be. The third embodiment configured as described above can achieve the same operational effects as the first embodiment.

In this embodiment, similarly to the above embodiment, the spiral tube 16b is configured as a porous tube, and the tube 16b is used as a water collecting tube for introducing spring water only for an initial period, and thereafter, curable filling is performed. The material 18b is filled.

  FIG. 8 and FIG. 9 show a fourth embodiment of the bottom guide shaft advanced arch pipe roof construction method according to the present invention, and the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be given. And only the feature points will be described in detail below.

  In the bottom guide shaft advanced arch pipe roof construction method shown in these drawings, first, prior to excavation of the tunnel main shaft 10c, the bottom guide shaft 12c is advancedly constructed as shown in FIG. The bottom guide shaft 12c is arranged so as to correspond to the invert portion of the main shaft 10c to be constructed, and when the guide shaft 12c is constructed by a predetermined length, next to the main shaft 10c. An arch pile roof 14c that includes the arch portion and the invert portion of the pit 10c, surrounds the entire circumference of the pit 10c, and is closed and is permeable is installed.

  In the case of the present embodiment, the arch pile roof 14c has one spiral tubular body 16c and a curable filler 18c filled in the tubular body 16c. Unlike the third embodiment, the spiral tubular body 16c is not provided with a joint on the side surface.

  Similar to the above embodiment, the spiral tube 16c penetrates the side wall of the bottom guide pit 12c and protrudes to the outside ground, and then is taken into the bottom guide pit 12c again. It is installed in a closed state covering the outer periphery of the main pit 10c.

  The spiral tube 16c is installed adjacent to the tunnel axis direction at a predetermined interval, and when the required tube body 16c is installed, the tube body 16c arranged adjacent to the tunnel axis direction includes: A curable filler 18c is filled.

  When the arch pipe roof 14c having a predetermined length is formed by the above-described process, the inside of the arch pipe roof 14c is excavated to construct the main mine 10c. Thereafter, the same processes as those in the first embodiment are sequentially repeated. Will be. The fourth embodiment configured as described above can achieve the same operational effects as the first embodiment.

In this embodiment, similarly to the above embodiment, the spiral tube 16c is configured as a porous tube, and the tube 16c is used as a water collection tube for introducing spring water only for an initial period, and thereafter, curable filling is performed. The material 18c is filled.

  As described above in detail, according to the advanced guide arch pile roof construction method according to the present invention, it is possible to almost eliminate the problem of spring water during excavation of the main mine, so tunnels at locations where there is a lot of spring water. It can be used effectively for construction.

It is explanatory drawing of the initial stage process which shows 1st Example of a certain mine advanced arch pile roof construction method concerning this invention. It is a principal part cross-sectional enlarged view of FIG. It is explanatory drawing of the process performed following the process of FIG. It is process explanatory drawing which shows the 2nd Example of the guiding shaft advanced arch pile roof construction method concerning this invention. FIG. 5 is an enlarged cross-sectional view of a main part of FIG. 4. It is process explanatory drawing which shows the 3rd Example of a certain guiding shaft advanced arch pile roof construction method concerning this invention. It is a principal part cross-sectional enlarged view of FIG. It is process explanatory drawing which shows the 4th Example of a certain guiding shaft advanced arch pile roof construction method concerning this invention. It is a principal part expanded view of FIG.

Explanation of symbols

10, 10a to 10c Main mine 12, 12a to 12c Bottom guide mine 14, 14a to 14c Arch pipe roof 16 Curved tube 18 Curable filler

Claims (1)

Prior to excavation of the tunnel main mine to be constructed, a bottom guide pit for drainage is constructed in advance corresponding to the approximate invert part of the main mine, and groundwater is collected and discharged into the bottom guide pit. In addition, from within the bottom guide pit, a permeable arch pipe roof having a closed cross section including the arch portion and the invert portion of the main mine and surrounding the entire circumference is installed along the tunnel axial direction, and then, In the bottom mine pipe advanced arch pipe roof construction method of excavating the arch pipe roof and constructing the main mine ,
The arch pipe roof is connected to each other through a joint portion provided on the side surface of each curved pipe when a plurality of curved pipes are installed adjacently along the tunnel axis direction from within the bottom guide pit. While installing around the outer periphery of the main mine,
Alternatively, the arch pipe roof may be formed by connecting the spiral pipe body from the inside of the bottom guide pit to each other at a portion adjacent to the side surface in the tunnel axial direction through a joint portion that is fitted to each other. Installed to go around the outer circumference of the
The curved tube body or the spiral tube body is composed of a perforated tube, installed without being filled with a curable filler inside, and used as a water collection tube for introducing spring water only during an initial period, and then the cured tube A bottom pit advanced arch pipe roof construction method , wherein the inside of the arch pipe roof is excavated after filling with a filler .

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