JP5154063B2 - Vertical shaft segment - Google Patents

Description

  The present invention relates to a shaft segment, and more particularly to a shaft segment made of concrete or the like that can reliably fill a gap between a shaft and a natural ground with a grout material after the shaft is constructed.

  As one of the methods for constructing a vertical shaft, a press-in underground subsidence method is known. As shown in FIG. 6, this press-fitting underground subsidence mine method assembles concrete segments 6 (hereinafter simply referred to as segments) constituting the shaft 5 into a ring shape, and fixes the press-fitting device 8 to the ground by a ground anchor 7. In this method, the press-fitting process of the segment ring 9 by the press-fitting device 8 and the excavation process of the ground in the segment ring 9 by the excavator 10 are repeated.

The above-mentioned pit construction method has the following advantages.
(1) Residual soil or the like during ground excavation can be easily discharged by the bucket, so that it does not hinder the assembly of the segment ring 9 on the ground.
(2) It is safe because workers do not have to enter the pit when excavating the ground.
(3) Water stoppage performance can be secured without ground improvement.
(4) Little impact on nearby structures and surrounding ground.

  When a shaft is constructed by the above-described press-fitting underground subsidence method, a blade ring 11 is attached to the lowermost segment ring 9A to facilitate the press-fitting of the segment ring 9A, and the press-fitting resistance is reduced. A friction cut 14 is provided outside the blade ring 11. For this reason, as shown in FIG. 6, a space | gap (S) arises between the shaft 5 and a natural ground.

  When the horizontal supporting force of the shaft 5 becomes a problem, the gap (S) is usually filled with a grout material (G) having a strength equal to or higher than that of a natural ground. As the grout material (G), for example, a mixture of cement, bentonite and water is used.

  Conventionally, in order to fill the gap (S) with the grout material (G), a pipe 12 is attached along the height direction inside the segment 6 as shown in FIG. Then, when the segment ring 6 is connected, the pipe 12 is also connected. As shown in FIG. 9, after completion of the construction of the shaft 5, the grout material (G) is formed by the ground pump 13 through the pipe 12 connected to one. Is filled in the gap (S).

  Note that the pipe 12 of the segment 6 at a predetermined height position where the grouting material (G) is filled in the gap (S) is, as shown in FIG. 8, the grouting material injection port 6A formed in the segment 6 in the thickness direction. Keep connected.

  Hereinafter, the above-described filling method is referred to as a conventional method.

  As described above, according to the conventional method, after the construction of the shaft 5 is completed, the grout material (G) is passed through the pipe 12 by the pump 13 and the grout material injection port 6A of the segment 6 arranged at a predetermined height position. To the gap (S).

  However, in order to fill the grout material (G) without any gaps in all of the long gaps (S) extending over several tens of meters, the filling height position of the grout material (G) is divided into several stages, and from the lower stage to the upper stage. It is necessary to fill sequentially. For this reason, it is necessary to arrange the pipes 12 according to the number of stages, which takes a lot of labor and time.

  In addition, when the upper and lower segment rings are misaligned, the pipe 12 comes off and the grout material leaks from the connecting portion, or when the pipes 12 are connected to each other by mechanical means such as a coupler, the connection cannot be made. There was a risk that the grout material could not be filled.

  In addition, the pipe 12 may interfere with excavation or may interfere with the bucket and break.

  In addition, it is necessary to remove the pipe 12 after the filling of the grout material (G) is completed.

  Therefore, the object of the present invention is that not only pipes for filling the grout material (G) into the gap (S) between the shaft 5 and the ground after the construction of the shaft 5 is completed, It is an object of the present invention to provide a shaft segment that can ensure a predetermined sealing effect even if the segments are slightly deviated in the circumferential direction at the time of construction, and does not hinder the filling of the grout material (G).

  The present invention has been made to achieve the above-described object, and is characterized by the following.

According to the first aspect of the present invention, in the segment constituting the shaft, the segment main body, at least one grout material injection hole formed in the axial direction in the segment main body, and the inlet of the grout material injection hole are arranged. The inlet of the grout material injection hole is opened on the upper surface of the axial joint surface of the segment body, and the outlet of the grout material injection hole is formed on the lower surface of the axial joint surface of the segment body. A recess is formed on the upper surface of the segment main body in the axial direction joining surface to accommodate the packing. The diameter of the packing is larger than the diameter of the inlet .

According to the second aspect of the present invention, in the segment constituting the shaft, the segment main body, the at least one grout material injection hole formed in the axial direction in the segment main body, and the inlet of the grout material injection hole are arranged. has been made and a packing, an inlet of the grout injection hole is opened on the upper surface of the axial joining surface of the segment body, an outlet of the grout injection hole is opened on the outer peripheral surface of the segment body, the A recess for receiving the packing is formed on the upper surface of the axial joining surface of the segment body, and the diameter of the packing is larger than the diameter of the inlet .

According to a third aspect of the present invention, in the segment constituting the shaft, the segment main body, the at least one first grout material injection hole formed in the axial direction in the segment main body, and the axial direction in the segment main body are formed. At least one second grout material injection hole and a packing disposed around the inlet of the grout material injection hole, wherein the inlet of the first grout material injection hole is an axial joining surface of the segment body The outlet of the first grout material injection hole is open to the lower surface of the axial joint surface of the segment body, and the inlet of the second grout material injection hole is the axial joint surface of the segment body. opening of the upper surface, the outlet of the second grout injection hole is opened on the outer peripheral surface of the segment body, the upper surface of the axial joining surface of the segment body, the packings Recess for accommodating the grayed is formed, the diameter of the packing are those having a diameter greater than particular features of the inlet.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the grout material injection hole is formed by a pipe inserted into the segment body. Is.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the packing is made of vulcanized rubber having a durometer hardness type A of 10 to 30 as defined in JIS-K6253. It has the characteristic in being.

A sixth aspect of the invention is characterized in that, in the invention according to any one of the first to fifth aspects, the packing comprises an O-ring .

  According to this invention, after completion of the construction of the shaft, not only piping of the pipe for filling the grout material (G) into the gap (S) between the shaft and the natural ground is unnecessary, but at the time of construction of the shaft, Even if the segments are connected with a slight shift in the circumferential direction, a predetermined sealing effect can be ensured, and the filling of the grout material (G) is not hindered. Also, if the upper and lower segment rings are misaligned, the pipe will come off and the grout material will leak from the connecting part, and it is not necessary to connect the pipes with a mechanical means such as a coupler. There is no danger of breakage due to interference with the bucket, and there is no need to remove the pipe after filling the grout material.

  Next, an embodiment of the concrete segment of the present invention will be described with reference to the drawings.

  1 is a perspective view showing a concrete segment of the present invention, FIG. 2 is a perspective view showing another concrete segment of the present invention, FIG. 3 is a view taken along the line AA of FIG. 1, and FIG. Further, FIG. 5 is a partial cross-sectional view showing the concrete segment of the present invention, in which the cores are offset and connected.

  As shown in FIG. 1, the concrete segment of the present invention includes a segment main body 1 and at least one (one in this example) grout formed in the segment main body 1 in the axial direction (vertical shaft height direction). It consists of a material injection hole 2 and an O-ring 3 as a packing disposed around the inlet 2A of the grout material injection hole 2.

  The inlet 2A of the grout material injection hole 2 opens to the upper surface 1A of the axial joining surface of the segment body 1, and the outlet 2B of the grout material injection hole 2 opens to the lower surface 1B of the axial joining surface of the segment body 1. Yes. The upper surface 1A is formed with a recess 1C in which the O-ring 3 is accommodated (see FIGS. 4 and 5).

  The diameter of the O-ring 3 is larger than the diameter of the inlet 2A, and since the O-ring 3 is accommodated in the recess 1C, the O-ring 3 is not easily displaced.

  The shape of the grout material injection hole 2 may be an ellipse, a rectangle, or the like other than a circular shape. The grout material injection hole 2 is formed by a metal pipe 4 made of synthetic resin, vinyl chloride or steel pipe inserted into the segment body 1, but the pipe 4 may not be provided.

  In a shaft constructed by assembling a plurality of segments, the sealing material is repeatedly compressed and released in operation, so that a caulking material or the like has no sealing effect to fill the gap. Therefore, it is preferable to stop the water with the surface pressure generated by the compression restoring force of the regular vulcanized rubber, but the joint width opens up to about 3 mm due to the dimensional error of the segment, the installation error, and the like. For this reason, it is necessary to use the vulcanized rubber so that the compression ratio is within a range of 20% to 50%.

  However, a large force is required to compress 50% with a rubber of 40 or more with a general hardness (durometer hardness type A defined in JIS-K6253). Therefore, there is a risk of hindering the sealing performance. On the other hand, even if the hardness is too low, the sealing effect is reduced due to insufficient surface pressure during small compression.

  For this reason, in this invention, 10-30 vulcanized rubber is used as the O-ring 3 used for the water stop between the grout material injection holes 2 with a durometer hardness type A defined in JIS-K6253. According to the O-ring 3 having this hardness, the O-ring 3 can be compressed with a relatively low force that does not affect the tightening of the water expansion sealing material used for the segment joint portion, so that a predetermined surface pressure can be ensured. .

  As shown in FIG. 2, the outlet 2 </ b> B of the grout material injection hole 2 of the segment 1 at a predetermined height where the gap (S) is filled with the grout material (G) opens to the outer surface side of the segment body 1. .

  In addition, in one segment 1, a grout material injection hole 2 (first grout material injection hole 2a) as shown in FIG. 1 and a grout material injection hole 2 (second grout material injection hole 2b) as shown in FIG. As shown by a two-dot chain line in FIG.

  In order to fill the grouting material (G) in the gap (S) between the vertical shaft and the natural ground, after constructing the vertical shaft by the above-described press-fit underground subsidence method, using the concrete segment of the present invention, Similar to the conventional method, the grout material (G) may be fed into the grout material injection holes 2 connected to each other by a ground pump. Since the connecting portion of the grout material injection hole 2 is sealed by the O-ring 3, there is no fear of leakage of the grout material (G).

  In addition, as shown in FIG. 5, even if the segment bodies 1 are coupled to each other with a slight misalignment in the circumferential direction, if the O-ring 3 is within the range where it cannot be removed from the grout material injection hole 2, a predetermined sealing performance is obtained. Since it can be secured, there is no problem in filling the grout material (G). Moreover, the pipes 4 can be connected to each other without using mechanical connection means such as a coupler.

  As described above, according to the present invention, as in the conventional method, after completion of the construction of the shaft, the gap (S) between the shaft and the ground is filled with the grout material (G) into the shaft. The pipe 12 is not required to be installed, and even when the shafts are constructed, even if the segments are connected with a slight shift in the circumferential direction, a predetermined sealing effect can be secured, so there is no risk of leakage of the grout material. (G) filling will not be hindered. In addition, when the grout material injection hole is constituted by the pipe 2, it is not necessary to connect the pipes 2 by mechanical means such as a coupler, and the pipe 2 may interfere with excavation, interfere with the bucket, and may be damaged. Furthermore, it is not necessary to remove the pipe 2 after completion of the filling of the grout material.

  The above is a case where the present invention is applied to a concrete segment, but it can also be applied to a synthetic segment made of steel, steel-concrete, or the like.

It is a perspective view which shows the concrete segment of this invention. It is a perspective view which shows another concrete segment of this invention. It is an AA arrow line view of FIG. It is a fragmentary sectional view which shows the concrete segment of this invention connected. It is a fragmentary sectional view which shows the concrete segment of this invention with which the core shifted and connected. It is explanatory drawing of a press-in underground subsidence establishment mine method. It is a perspective view which shows the concrete segment used for the conventional method. It is a perspective view which shows another concrete segment used for the conventional method. It is sectional drawing which shows the filling method of the grout material by the conventional method.

Explanation of symbols

1: Segment main body 1A: Upper surface 1B: Lower surface 1C: Recess 2: Grout material injection hole 2A: Inlet 2B: Outlet 2a: First grout material injection hole 2b: Second grout material injection hole 3: O-ring 4: Pipe 5: Vertical shaft 6: Concrete segment 6A: Grout injection port 7: Ground anchor 8: Press-fitting device 9: Segment ring 9A: Bottom segment ring 10: Excavator 11: Blade ring 12: Pipe 13: Pump 14: Friction cut

Claims (6)

In the segments that make up the shaft,
A segment main body, at least one grout material injection hole formed in the axial direction in the segment main body, and a packing disposed around the inlet of the grout material injection hole, and the inlet of the grout material injection hole is , Opening on the upper surface of the axial joint surface of the segment body, the outlet of the grout material injection hole opens on the lower surface of the axial joint surface of the segment body, on the upper surface of the axial joint surface of the segment body, A recess segment for accommodating the packing is formed, and the diameter of the packing is larger than the diameter of the inlet . In the segments that make up the shaft,
A segment main body, at least one grout material injection hole formed in the axial direction in the segment main body, and a packing disposed around the inlet of the grout material injection hole, and the inlet of the grout material injection hole is An opening on the upper surface of the axial joint surface of the segment body, an outlet of the grout injection hole opens on an outer peripheral surface of the segment body, and the packing is accommodated on the upper surface of the axial joint surface of the segment body A vertical shaft segment , wherein a recess is formed and the diameter of the packing is larger than the diameter of the inlet . In the segments that make up the shaft,
A segment body, at least one first grout material injection hole formed in the axial direction in the segment body, at least one second grout material injection hole formed in the axial direction in the segment body, and the grout And a packing disposed around the inlet of the material injection hole, wherein the inlet of the first grout material injection hole opens on the upper surface of the axial joint surface of the segment body, and the outlet of the first grout material injection hole Is opened at the lower surface of the axial joint surface of the segment body, and the inlet of the second grout material injection hole is opened at the upper surface of the axial joint surface of the segment body, and the outlet of the second grout material injection hole is opened to the outer peripheral surface of the segment body, the upper surface of the axial joining surface of the segment body, the recess for accommodating the packing is formed, the diameter of the packing Shaft for segments, wherein the larger diameter of the inlet. The shaft segment according to any one of claims 1 to 3, wherein the grout material injection hole is formed by a pipe inserted into the segment body . 5. The shaft segment according to claim 1 , wherein the packing is made of vulcanized rubber having a durometer hardness type A of 10 to 30 as defined in JIS-K6253. . The shaft segment according to any one of claims 1 to 5 , wherein the packing includes an O-ring .

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