JPH08114099A - Propulsion pipe and method for constructing outer wall body of large cavity - Google Patents

Abstract

PURPOSE: To provide couplings with sufficient durability and to enable inner soil to be immediately excavated by forming the connecting surfaces of upper and lower propulsion pipes into circular shapes that fit each other, and causing the recessed and projecting parts of the connecting surfaces to be fitted and slid against each other for propulsion. CONSTITUTION: Each propulsion pipe 1 is formed by first and second opposite circular surfaces 2, 3 and side faces 4, 4 connecting the circular surfaces 2, 3 together at both ends. The lowermost propulsion pipe 1 is propelled from a propulsion-pipe starting shaft with the first circular surface 2 facing upward, and a projecting part 6 of T-shaped cross section welded to the second circular surface 3 of the next propulsion pipe 1 is fitted and slid into a recessed portion 5 provided in the first circular surface 2 of the lower propulsion pipe 1 and the pipes are propelled. Soil between the recessed part 5 and the projecting part 6 is washed off by injection of a high-pressure jet of water from a recessed portion 9 of an inverted Ω-shaped cross section which is provided on the first circular surface 2, and after a sealant is packed, tightening steel rods are passed through through holes 7a, 8a provided in the respective circular surfaces 3, 2 and are connected together, and high-performance mortar is injected from the recessed portion 9 and packed. Similar procedures are repeated to construct the outer wall body of a tunnel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe constituting an outer wall of a large cavity to be constructed underground, and a construction method of an outer wall of the large cavity.

[0002]

2. Description of the Related Art Conventionally, various construction methods such as a ring shield method and a micro multi shield method have been proposed as methods for constructing a large-section tunnel.

In the ring shield method, only the outer portion of a tunnel having a large cross section having a predetermined shape is preliminarily excavated in a ring shape by using a large shield machine having the same shape, and this portion is covered with cast-in-place concrete or segments. Build the body, and then excavate the soil inside to complete the tunnel.

Also in the micro-multi shield method, a plurality of small and medium-sized shield machines are used to dig parallel single tunnels, and earth and sand between the individual tunnels are manually dug using ground improvement, and cast in situ. The tunnels are completed by connecting the tunnels with each other to close the outer lining body, and then excavating the earth and sand inside.

[0005]

However, each of the above-mentioned prior arts has a problem.

When the lining between the individual tunnels is formed by cast-in-place concrete, there is a problem that the rigidity becomes discontinuous. On the other hand, when the lining body is formed by segments, since shearing force due to earth pressure acts from outside the tunnel after excavation of the inner sand, it becomes necessary to integrate the secondary lining or it is destroyed. There is a danger and the excavation work will be done on bare ground, which requires extensive ground improvement.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to cause relative displacement between pipes during extrusion when constructing a large hollow outer wall in the ground. In this way, the pipes do not come into close contact with each other to form a gap, and even if a shear force due to earth pressure acts from the outside of the tunnel, the joint can maintain sufficient proof strength. The purpose of the present invention is to provide a propulsion pipe that can be used for excavating the soil immediately after forming the body.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above objects, and its gist is a tubular body forming an outer wall of a large cavity constructed in the ground, In the protruding first arc surface, in the surface facing the first arc surface, the second arc surface recessed in the tubular body in a shape that fits with the first arc surface, and the first arc surface. Two side surfaces connected to the arc surface and the second arc surface at both ends thereof, and formed on the first arc surface and the second arc surface for sliding and connecting the tubular bodies with each other. It is in a propulsion tube consisting of sliding and joint means.

Here, in the propulsion pipe of the present invention, the pipe constituting the outer wall of a large cavity constructed underground is, for example,
This is a propulsion pipe that constitutes a large cavity requiring a very large cross section, such as a double lane road tunnel, a railway tunnel, an underground interchange, and an underground station, that is, a wall of a large section tunnel or the like.

In the propulsion pipe according to the present invention, the first arc-shaped surface protruding outside is a surface extending in the axial direction of the tube, and a concave portion recessed inside is formed on this surface. It may be provided extending in the direction. The recessed portion can be used as an injection pipe for injecting jet water when washing the earth and sand sandwiched between the pipes adjacent to each other in the tunnel cross-sectional direction after combining a plurality of pipes. In addition, the concave portion may be provided on a second circular surface described later instead of the first circular surface, or may be provided on both the first and second circular surfaces. Sediment washing effect is obtained. Further, on the first arc surface, when tightening the pipes adjacent to each other in the tunnel cross-sectional direction, a through hole that penetrates the binding steel rod, and a reinforcing metal fitting is provided inside the pipe to reinforce this through hole. May be.

[0011] In the propulsion pipe of the present invention, the second arc-shaped surface protruding into the pipe body in a shape fitting with the first arc-shaped surface is
A surface extending in the axial direction of the tube body facing the first arc surface, and a similar through hole is provided on this surface at a position facing the through hole provided in the first arc surface. A reinforcing metal fitting can be provided.

In the propulsion pipe according to the present invention, the sliding / joining means formed on the first and second arc surfaces for sliding and connecting the tubes with each other includes, for example, the first and second arc surfaces. On the arc surface,
An inwardly recessed C-shaped recess is provided extending in the axial direction of the tube body by means of a channel material or the like, while the second arc surface has a protrusion that fits with the recess at a position facing the recess. The portion may be provided by an H-shaped steel or the like so as to extend in a T shape in the axial direction of the tubular body. Further, the recess may be filled with a sealing material in advance. Contrary to the above, the concave portion may be provided on the second arc surface and the convex portion may be provided on the first arc surface.

As described above, in the propulsion pipe according to the present invention, the first arc surface and the second arc surface are formed in an arc shape so as to be fitted to each other. When the pipes are formed, the connecting force between the pipes is increased, and the pipes can exert the proof stress against the shearing force due to the earth pressure from the outside of the tunnel.

Further, the concave portion and the convex portion as the sliding / coupling means formed at the positions where the first circular arc surface and the second circular arc surface are opposed to each other, propel the tubular body during the construction of the tunnel outer wall. It can be used as a track, and thus relative displacement between the tubes can be prevented. Further, the sliding / joining means between the concave portion and the convex portion can enhance the connecting force between the tubular bodies after the construction of the outer wall of the tunnel to improve the proof stress against the shearing force due to the earth pressure from the outside of the tunnel. it can.

Another subject of the present invention is a propulsion construction method for constructing a large hollow outer wall body constructed in the ground, which has sliding / joint means on the upper surface in the axial direction of the propulsion pipe. The first step of forming a lowermost tunnel by propelling the propulsion pipe having the sliding / coupling means fitted to the sliding / coupling means on the lower surface in the axial direction of the propulsion pipe, and this tunnel. The sliding / joint means on the upper surface of the propelling tube to be configured is fitted with the sliding / joint means on the lower surface of another propulsion tube, and in this fitted state, another propulsion tube is slid from the propulsion tube launching hole and propelled. Then, the second step of forming a connected tunnel on the bottom tunnel,
This is a method for constructing a large-cavity outer wall body in which the same step as the second step is repeated a predetermined number of times to form a predetermined number of tunnels on the tunnel formed by the second step.

The propulsion pipe used in the method for constructing a large hollow shell wall according to the present invention may be the propulsion pipe described in claim 1 or 2.

[0017]

The propulsion tube of the present invention forms a tunnel by propelling the propulsion tube from the propulsion tube starting pit with the first arc surface positioned upward. Next, the sliding / joint means formed on the second arc surface of another propulsion pipe is fitted to the sliding / joint means formed on the first arc surface of the propulsion pipe of this tunnel, and this fitting is performed. In the combined state, the propulsion pipe is propelled from the propulsion pipe starting pit in the same manner as described above to form a tunnel. Similarly, the tunnels are successively connected one above the other to form a large cavity, for example, a shell wall of a large-section tunnel.

[0018]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view showing a wall of a large-section tunnel in which the propulsion pipe of the present invention is applied to a side wall, FIG. 2 (a) is a perspective view of the propulsion pipe of the present invention, and FIG. A in FIG.
It is -A sectional drawing. In FIG. 1, a large section tunnel 50
Is the work pit 2 provided in the upper, middle and lower tiers on both sides of the tunnel
0, 21, 22; three-stage propulsion pipes 1 ', 1 "provided so as to form side walls between the work pits; and a ceiling formed between upper work pits 20 on both sides. Roof pipe 26, a pipe 27 provided between the middle working pits 21 on both sides to form an intermediate floor, and a pipe 28 provided between the lower working pits 22 on both sides to form a lower floor. Consists of

The side wall is formed by propelling the propulsion pipe 1 of the present invention in the tunnel axis Z direction by a propulsion method.
The working pits 20, 21, 23 are screw cutters,
A drum cutter or a shield machine having an excavating mechanism such as high-pressure jet water is used to excavate in the direction of the tunnel axis Z in the same manner as the above-mentioned side wall to form a segment having a diameter of about 2.5 to 3.5 m, for example. Further, a roof roof pipe 26, an intermediate floor pipe 27 and a lower floor pipe 28.
Is excavated in the X direction across the tunnel from the upper, middle and lower work pits 20, 21, 22 and formed, for example, by a pipe having a diameter of about 0.7 to 2.0 m.

The number of the working pits and the number of the propulsion pipes between the working pits can be appropriately determined according to the size of the large-section tunnel.

Next, the propulsion pipe of the present invention applied to the side wall will be described with reference to FIGS. 2 (a) and 2 (b). The propulsion pipe 1 protrudes into the pipe body 1 in a shape that fits with the first arc surface 2 on the first arc surface 2 that protrudes to the outside and on the surface facing the first arc surface 2. Second circular surface 3
And two side surfaces 4 which are connected to the first circular arc surface 2 and the second circular arc surface 3 at both ends thereof, and sliding and joint means for sliding and connecting the tubular bodies with each other. The concave portion 5 formed on the circular arc surface 2 and the convex portion 6 formed on the second circular arc surface 3 constitute a main part.

Here, the first arc surface 2 is a surface extending in the axial direction of the tube, and a concave portion 9 recessed inside is provided in the center of the surface so as to extend in the axial direction of the tube. The concave portion 9 has an inverted Ω-shaped cross section, and includes an opening 9a and a tubular portion 9b which are continuous in the axial direction of the tubular body. This recess 9
Is used as an injection pipe for injecting jet water when cleaning the earth and sand sandwiched between adjacent pipes in the Y direction of the tunnel crossing after combining a plurality of pipes 1. Further, the first arc surface 2 has four through holes 8a for penetrating the binding steel rods when tightening the pipes 1 adjacent to each other in the tunnel crossing Y direction, and reinforcing the respective through holes 8a. Pipe 8b and a reinforcing metal fitting 8c for this purpose are provided.

The second arcuate surface 3 is a surface extending in the axial direction of the tube facing the first arcuate surface 2, and has a through hole 8 a formed in the first arcuate surface 2. A similar through-hole 7a, reinforcing pipe 7b, and reinforcing metal fitting 7c are provided at four positions opposite to.

The concave portion 5 is provided at two locations on both sides of the inverted Ω-shaped concave portion 9 and the through hole 8a of the first circular arc surface 2 so as to extend in the axial direction of the tubular body. C recessed in
Opening 5a having a U-shaped cross section and extending in the axial direction of the tubular body
And a tubular portion 5b formed of a channel material. On the other hand, the convex portion 6 is provided with the concave portion 5 of the first arc surface 2.
Are provided at two locations on both sides of the through-hole 7a of the second arc surface 3 so as to extend in the axial direction of the tube body. This convex portion 6
Has a T-shaped cross section protruding to the outside, that is, a flange 6a of an H-shaped steel.
Is formed by welding to the second arc surface 3. In addition, the pipe body 1 is provided on the entire inner circumference of the pipe body in a cross section direction orthogonal to the pipe axis direction.
A plurality of reinforcing ribs 10 are provided at appropriate intervals.

Further, a sealing plate 5d may be provided by welding on the front and rear ends 5c of the recess 5 of the propulsion pipe shown in FIG. 2, and this sealing plate 5d is provided as shown in FIG. In addition, a steel plate having a T-shaped notch having a minimum size to which the T-shaped protrusion 6 can be fitted is used. Such a sealing plate 5d is provided at the front and rear ends 5c, 5c of the concave portion 5, and a sealing material (not shown) is provided in advance.
When the propulsion pipe 1 is propelled, it is possible to prevent the earth and sand or the groundwater that has penetrated into the fitting portion 5 from pushing out the sealing material by the pressure.

Next, the procedure for sliding and connecting the tubes of the present invention to each other to form a tunnel outer wall will be described.

When forming the outer wall of the tunnel, for example, FIG.
, The lowermost propulsion pipe is sequentially propelled from a propulsion shaft (not shown), and a tunnel formed by this propulsion pipe is provided extending in the tunnel axis Z direction. As for the face when propelling the propulsion pipe, the circular portion 30 shown in FIG. 3 is excavated with a circular cutter of a shield machine, and the other portions 31, 32 are excavated with high-pressure jet water.

After constructing the tunnel by the lowermost propulsion pipe, as shown in FIGS. 4 and 5, the concave portion 5 of the lowermost propulsion pipe 1a is fitted with the convex portion 6 of the middle propulsion pipe 1b. Then, the propelling tubes 1b in the middle stage are propelled one after another from the propulsion shaft in this fitted state, and a tunnel formed by the propelling tubes 1b in the middle stage is provided extending in the tunnel axis Z direction. At this time, the recess 5
Is used as the orbit of the convex portion 6 of the middle-stage propulsion pipe 1b, it is possible to prevent relative displacement between the propulsion pipes and to enhance the coupling force between the propulsion pipes. Further, in addition to the fitting state of the concave portion 5 and the convex portion 6,
Since the first arc surface 2 and the second arc surface 3 are formed in an arc shape that fits each other, the connection force between the propulsion pipes is further increased. Therefore, even if a shear force acts on the tunnel outer wall due to earth pressure after excavating the soil inside the tunnel outer wall, a sufficient strength can be obtained on the tunnel outer wall.

Next, the gap between the lowermost propulsion pipe and the middle propulsion pipe is stopped, and both propulsion pipes are integrated.

The earth and sand that has entered the gap between the recessed portion 5 and the convex portion 6 in the fitted state is washed with high-pressure jet water, and a sealing material 43 that is hardened after injection is filled therein. In the construction at a place where the underground water pressure is high, instead of injecting the sealing material after fitting the concave portion 5 and the convex portion 6, the concave portion 5 of the propulsion pipe is previously prepared in a propulsion pipe manufacturing plant or a propulsion pipe stock yard. Can be filled with a sealing material. In this case, the middle propulsion pipe 1b slides on the concave portion 5 of the lowermost propulsion pipe 1a while cutting the sealing material by the convex portion 6,
Infiltration of groundwater and earth and sand into the fitting portion can be prevented.

When the sealing material is filled after the concave portion 5 and the convex portion 6 are fitted, after the sealing material 43 is hardened, or when the propulsion tube pre-filled with the sealing material is used, After the propulsion of the middle propulsion pipe 1b, an injection pipe (not shown) of high-pressure jet water is inserted into the inverted Ω-shaped recess 9 of the propulsion pipe 1a to wash the earth and sand that has entered the gap 40. When the cleaning is completed, as shown in FIG. 5, the binding steel rod 41 is passed through the through hole 8a of the propulsion pipe 1a and the through hole 7a of the propulsion pipe 1b, and nuts 42 are screwed to both ends of the binding steel rod 41. Propulsion pipe 1
a and the propulsion pipe 1b.

Thereafter, a grout injection tube is inserted into the inverted Ω-shaped recess 9, and the space is filled with a high-flow, high-strength, non-shrinkable high-performance mortar, for example, over the entire length of the gap 40. The integration of the lower propulsion pipe 1a and the middle propulsion pipe 1b is completed.

Further, the other propulsion pipes are connected to each other by the same process as above to form the outer wall of the tunnel.

[0035]

In the propulsion pipe according to the present invention, since the sliding / joining means is provided on the first arc surface and the second arc surface, the first arc surface and the second arc surface of different propulsion tubes are provided. When the sliding / joining means is fitted to the arc surface and one of the propulsion tubes is propelled in this fitted state, relative displacement between the propulsion tubes can be prevented, and the coupling force between the propulsion tubes can be prevented. Can be increased. Further, since the first arc surface and the second arc surface are formed in a shape that fits each other, the connection force between the propulsion pipes can be further increased. Therefore, if a large cavity is formed by the propulsion pipe of the present invention, for example, an outer wall body such as a large cross section tunnel is formed, after excavating the earth and sand inside the outer wall of the tunnel,
Even if a shearing force acts on the outer wall of the tunnel due to earth pressure, the outer wall of the tunnel can obtain sufficient proof stress. Furthermore, since the propulsion pipes are fitted and connected to form an outer wall as a lining body, it is possible to excavate earth and sand immediately after the formation.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an outer wall of a large-section tunnel in which a propulsion pipe of the present invention is applied to a side wall.

2A is a perspective view of a propulsion pipe according to the present invention, and FIG. 2B is a cross-sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view illustrating a situation of excavating a face when using the propulsion pipe of the present invention.

FIG. 4 is an explanatory cross-sectional view when connecting a propulsion pipe according to the present invention.

FIG. 5 is an explanatory cross-sectional view when connecting a propulsion pipe according to the present invention.

FIG. 6 is a front view showing a sealing plate for sealing both ends of a concave portion of the propulsion pipe of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 1st circular surface 3 2nd circular surface 4 Side surface 5 Depression (joint means) 6 Convex part (joint means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000140292 Okumura Gumi Co., Ltd. 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka (71) Applicant 000172813 Sato Kogyo Co., Ltd. 1-11 Sakuragi-cho, Toyama-shi, Toyama Prefecture (71) Applicant 390028015 Chizaki Kogyo Co., Ltd. 2-23-1, Nishishinbashi, Minato-ku, Tokyo (71) Applicant 000146928 Morimoto Gumi Co., Ltd. 4-11 Yuhigaoka-cho, Tennoji-ku, Osaka-shi, Osaka (71) Applicant 000112668 Fujita Co., Ltd. 4-6-15 Sendagaya, Shibuya-ku, Tokyo (72) Inventor Toshinori Toyota 4-10-8 Shinkino, Abiko-shi, Chiba

Claims (3)

[Claims] 1. A pipe constituting an outer wall of a large cavity constructed in the ground, wherein the first arc surface protruding to the outside and a surface facing the first arc surface are the first arc surface. A second arc surface that is recessed inside the tube in a shape that fits the arc surface, two side surfaces that are connected to the first arc surface and the second arc surface at both ends, and the tube mutual And a sliding / coupling means formed on the first circular arc surface and the second circular arc surface for sliding and connecting the propulsion pipe. 2. The sliding / joining means comprises a concave portion formed on the first circular surface in the axial direction of the propulsion pipe and a convex portion formed on the second circular surface in the axial direction of the propulsion tube. Or a projection formed on the first circular surface in the axial direction of the propulsion tube and a concave portion formed on the second circular surface in the axial direction of the propulsion tube, and the concave portion is filled with a sealing material in advance. The propulsion pipe according to claim 1, wherein the propulsion pipe is formed. 3. A propulsion method for constructing an outer wall of a large cavity to be constructed in the ground, which has sliding / joint means on the upper surface in the axial direction of the propulsion pipe and is fitted to this sliding / joint means. The first step of forming a lowermost tunnel by propelling a propulsion pipe that has sliding / joint means on the lower surface in the axial direction of the propulsion pipe, and sliding the upper surface of the propulsion pipe that constitutes this tunnel.・ Sliding the bottom surface of another propulsion pipe to the joint means ・ Match the joint means, and in this fitted state, propel the other propulsion pipe while sliding it from the propulsion pipe start pit, The outer wall of the large cavity, which has a second step of forming a tunnel connected above and a step similar to the second step is repeated a predetermined number of times to form a predetermined number of tunnels on the tunnel formed by the second step. Body construction method.