JP3088929B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure for forming a large underground space in the ground.

[0002]

2. Description of the Related Art Conventionally, in order to build an underground space such as a tunnel in the ground, a ground is excavated from the surface of the ground to a desired depth with a length and a width of a planned underground space, and then a wall body is constructed. A construction method and a method of sequentially assembling segments at the tail portion of the excavator while excavating the ground with a shield excavator are generally known, but according to the open-cutting method, existing railways and buildings are used. Not only may construction not be possible due to the presence of the equipment, but also there is a risk that the facility functions on the ground may be hindered for a long period of time, and furthermore, there is a problem that efficient construction is difficult. .

[0003] On the other hand, according to the shield method, the larger the diameter of the cutter plate for excavating the ground, the lower the number of rotations is due to the friction with the ground. It is difficult to construct an underground space with a large cross section of 20m or more, and the larger the excavation diameter, the more complicated the rotary drive mechanism and other structures become, and the strength and accuracy are increased. There is a problem that the production cost is high as required. Moreover, even if it is suitable for excavation in deep underground, when excavating in relatively shallow ground, ground collapse occurs, so it is not suitable as a method of constructing a large space in shallow underground, It is impossible to excavate a space with a rectangular cross section such as an underground shopping mall.

Accordingly, the applicant of the present application has disclosed in Japanese Patent Laid-Open No. 4-155.
A method for constructing an underground structure as described in JP-A-0994 was developed. In this method, two pilot pipes are placed along the outer periphery of the planned underground space between shafts excavated at predetermined intervals.
After a plurality of sets are buried in parallel at regular intervals as one set, the pilot pipes are placed in a state in which the front end sides of the plate-shaped segment member abut on the rear end faces of the opposing pilot pipes of the adjacent sets. By pushing out the segment members while excavating the ground, the pilot pipe is pushed out to the other shaft side and the segment members are buried in the excavation site, and this operation is sequentially repeated to remove the outside of the underground structure composed of the row of segment members. This is a method of building a shell, and according to this method, it is possible to efficiently build a large underground structure having a rectangular cross section even in the ground shallow from the ground surface.

[0005]

However, in such a method of constructing an underground structure, even if the male and female joints which slidably engage with each other protrude from the opposing side surfaces of the segment member, the segment member may be provided. Because the pilot pipe is propelled as a guide while pushing out the pilot pipe at the front end face of the side part, if each set of pilot pipes is embedded in a state shifted vertically and horizontally, it is embedded first. The joint protruding from the opposite side surface of the segment member to be embedded next to the joint of the segment member cannot be propelled while being engaged at an accurate position. In particular, there is a problem that it is difficult to construct a long underground structure because the pilot pipe burial accuracy is degraded as the construction becomes longer.

Further, the joint part projecting from the side surface of the already buried segment member is buried in the ground in an exposed state, and the joint member of the next segment member is engaged with this joint part while the segment member is engaged. Since the propulsion is performed, not only the earth and sand enter into the engaging portions of the male and female joints, which hinders smooth propulsion, but also the joints of the segment members are connected and treated with concrete to integrate the whole. There is a problem that the reliability of the strength of the joint portion is inferior, and a weak portion is formed in the underground structure including the row of segment members. Also, since the segment members are made of concrete,
There are difficulties in handling and construction such as transportation, so that a large segment member cannot be used, and there is a problem in constructing a large-section underground structure. The present invention provides a method of constructing an underground structure for solving such a problem.

[0007]

In order to achieve the above object, a method of constructing an underground structure according to the present invention comprises burying a plurality of pilot pipes between shafts at the position of the outer shell of a section of the underground structure to be constructed. After that, a method of constructing an underground structure by replacing these pilot pipes and the hollow segments, and sequentially penetrating the hollow pilot pipes at least from the joints of the hollow segments from one shaft to the other shaft. After being buried in the state, the male and female joints are formed over the entire length on both side ends, and the temporary end pipes are fitted to one of the joints. The pilot pipe is pushed out to the other shaft side by pushing the pilot pipe toward the other shaft side by following the pilot pipe corresponding to the male and female joint part and propelling the hollow segment integrally with the temporary joint pipe toward the other shaft side. The pilot section is replaced with the pilot pipe, and then the front end face of the joint section adjacent to the buried hollow segment where the temporary pipe section of the next hollow segment is not provided is connected to the rear end face of the temporary pipe section of the buried hollow segment. The temporary joint pipe of the buried hollow segment is pushed out to the other shaft side by propelling the temporary joint pipe following the rear end face of the pilot pipe, and the propulsion hollow segment is inserted into the joint part covered with the temporary joint pipe. The propulsion hollow segment is buried while the pilot pipe is pushed out on the other end side of the hollow segment where the temporary joint pipe is fitted, and the next hollow segment is buried next to the hollow segment thus buried. A hollow segment in which the male and female joints are engaged with each other at the outer shell position of the cross section of the planned underground structure by repeatedly propelling and burying the hollow segment in the same manner as above After embedded cement column, the concrete filled into the hollow segments with integrally connecting the hollow adjacent segments, after accordingly, is characterized in excavating a ground enclosed by segment column.

As means for connecting adjacent hollow segments, as described in claim 2, a through hole through which an operator can enter and leave the hollow segment and a bolt mounting hole are provided. It is configured such that adjacent hollow segments are connected by bolts from within the segment.

[0009]

When a pilot pipe buried in a vertical shaft is pushed by a hollow segment to replace the pilot pipe and the hollow segment, a temporary joint pipe is fitted to a joint formed on a side of the hollow segment. Since the joint portion is propelled integrally, the joint portion can be buried in a portion of the cross-sectional shell position of the planned underground structure in a state of being covered with the temporary joint pipe without being exposed in the ground. And
When the next row of hollow segments is embedded and rubbed adjacent to the side of the embedded hollow segment, the temporary joint tube is extruded so that one side joint portion of the hollow segment follows the temporary joint tube of the embedded hollow segment. While the joint portion covered with the temporary joint tube is propelled by engaging the joint portion with each other, even if the pilot tube is buried in a state in which there is some deviation in the vertical and horizontal directions, regardless of the pilot tube, The two hollow segments can be accurately embedded in the outer shell position of the cross section of the planned underground structure by the engagement of the male and female joints.

At this time, while the temporary joint pipe covering the joint portion of the hollow segment previously buried is pushed forward, the joint portion of the next hollow segment is engaged with this joint portion and the hollow segment is propelled. The hollow segment can be smoothly propelled while preventing the earth and sand from entering the engaging portions of the male and female joints by the temporary joint pipe.

Further, since the segments are hollow, they are lightweight and have improved transportability and other handling properties and workability, and are also suitable for building large-sized underground structures by producing large segments. Above, as described in claim 2, by providing a through hole through which the worker can enter and leave the hollow segment and by providing a bolt mounting hole, after embedding, the worker enters the hollow segment and joined to each other. The joint operation of the joints of the hollow segments can be performed with bolts, and after the joint operation, concrete can be filled in the hollow segments to build a strong underground structure.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
First, as shown in FIG. 1, a hollow pilot pipe 1 is buried at regular intervals at the outer shell position of the underground structure so as to penetrate between the starting shaft A and the reaching shaft B (shown in FIG. 2).
This hollow pilot pipe 1 is made of a steel pipe of 2 meter square, and is press-fitted horizontally from the starting shaft A to the reaching shaft B,
Buried. The method of burying the pilot pipe 1 is known,
This can be done while following the pilot pipe 1 with a suitable excavator (not shown) or by inserting an auger screw inside the pilot pipe 1. If the length of the underground structure to be built is long,
May be buried while sequentially adding them in series.

In addition, a steel rim plate is placed on the upper surface of the pilot tube 1 and only the rim plate on the foremost pilot tube 1 is welded to the front end of the pilot tube 1 by welding or the like. When it is fixed and reaches the reaching shaft B side, the fixed portion is separated by cutting or the like, and the subsequent edge plates on the pilot pipe 1 are connected by welding or the like at the time of press-fitting. The rear end of the pilot tube 1 is fixed to the starting shaft A side, and the replacement of the pilot pipe 1 and the later-described hollow segment 2 can be smoothly performed along the lower surface of the pilot plate 1 while the edge plate is left in the ground.

After the pilot pipe 1 is buried between the shafts A and B in a part of the outer shell of the planned underground structure, the pilot pipe 1 is spaced from the pilot pipe 1 at a predetermined interval in the cross-sectional direction of the underground structure. Of the pilot tube 1 in the same manner as above
It is buried in between. The embedding position of the pilot pipe 1 is a position where at least the joint portion of the hollow segment 2 is embedded, that is, the pilot pipe 1 adjacent to the hollow pipe 2 at a certain interval.
1 is buried such that the width between the outer surfaces is equal to the width of the hollow segment 2.

In this manner, as shown in FIG. 1, the pilot pipe 1 is buried in the outer shell section of the planned underground structure at a certain interval in the horizontal and vertical directions between the shafts A and B. After that, the operation of replacing the pilot pipe 1 with the hollow segment 2 is performed. The hollow segment 2 is made of steel and is formed in a box shape having a horizontally long rectangular plane as shown in FIG.
(2 meters) and the width is the width obtained by dividing the planned underground structure into a plurality. A male joint 2a having a concave groove having a U-shaped cross section is formed at the center of one side surface, and a female joint having a U-shaped cross section large enough to fit the male joint 2a is formed at the center of the other side. Each portion 2b is formed over the entire length.

Further, bolt mounting holes 3a are formed at regular intervals in the length direction in the inner wall of the female joint portion 2b, that is, the upper and lower portions of the other side wall surface of the hollow segment 2, and one of the hollow segments 2 is formed. A bolt fastening plate 4 is fixed inside the side so as to be parallel to the male joint portion 2a. Bolt mounting holes 3b are provided at upper and lower portions of the bolt fastening plate 4 so as to be opposed to the bolt mounting holes 3a and to be spaced at regular intervals in the length direction. Drilled every time.

The upper and lower plates of the steel hollow segment 2 are formed on non-porous flat surfaces, while the front and rear plate pieces 2c,
At the center of 2d, there are provided horizontally long rectangular through-holes 6 and 7 large enough for workers to enter and leave, and a plurality of bolt mounting holes 3c and 3d are formed around these through-holes 6 and 7, respectively. ing. In the hollow segment 2, reinforcing plate pieces for connecting the upper and lower plates may be fixed at a plurality of locations.

When the hollow segment 2 constructed as described above is buried in the ground, a steel temporary joint pipe 8 having the same length as the hollow segment 2 is attached to the female joint portion 2b as shown in FIG. Keep it. The vertical width of the temporary joint pipe 8 is formed to be equal to the thickness of the hollow segment 2 and a guide strip having a U-shaped cross section having the same shape as the female joint 2b over the entire length at the center of one side thereof. The guide strip 8a is slidably fitted to the female joint 2b via a packing 10 (shown in FIG. 8). The packing 10 is fixed to the upper and lower facing surfaces of the female joint portion 2b over the entire length to prevent groundwater and earth and sand from entering the inside.

In order to replace the pilot pipe 1 embedded between the shafts A and B with the hollow segment 2 having the temporary joint pipe 8 attached thereto, the hollow segment 2 with the temporary joint pipe is set in the starting shaft A. Are arranged behind the adjacent pilot pipes 1, 1. In this case, the pilot tube 1,
1 is separated in the left-right direction, so it is necessary to excavate and remove the earth and sand between these pilot pipes 1 and 1. Therefore, the earth and sand excavator 9 is disposed between the pilot pipes 1 and 1.

As shown in FIGS. 5 and 6, the earth and sand excavator 9 has a front opening chamber 9b which is open at the front end and which communicates with the rear end of the pilot pipe 1 or the temporary joint pipe 8 on both sides. 9c
Are integrally provided, and an auger screw 9d is rotatably supported in a casing 9a having a U-shaped cross section.

Specifically, the thickness of the casing 9a is formed to be equal to the vertical width (2 meters) of the pilot pipe 1, and when excavating one side of the planned underground structure, the front opening chamber 9b, 9c is formed to have the same cross-sectional shape as the pilot pipe 1, and its opening end face is made to communicate with the rear end opening of the adjacent pilot pipe 1, 1 at a certain interval in communication with the pilot pipe 1, and the other parts of the planned underground structure In the case of excavating a part, one front opening chamber 9b of the casing 9a is formed in the same cross section as the temporary joint pipe 8 so that its open end face communicates with the rear end opening of the temporary joint pipe 8 in a communicating state. At the same time, the opening end surface of the other front opening chamber 9c is brought into contact with the rear end surface of the pilot tube 1 in a communicating state.

Further, both ends of the central axis of the auger screw 9d are rotatably inserted between the inner walls of the two opening chambers 9b and 9c, and are rotatably supported, and the auger screw 9d is inserted into one of the opening chambers 9b.
, A short mud feed pipe 9f opened in the excavation chamber 9e, and the other open chamber 9c is provided with a short sludge exhaust pipe 9g opened in the excavation chamber 9e and an auger screw drive motor 9h.

When excavating one side portion of the planned underground structure, the opening end faces of the front opening chambers 9b and 9c on both sides thereof are brought into contact with the rear end openings of the pilot pipes 1 and 1 on the starting shaft A side. The short pipes 9f and 9g provided inside these chambers were connected to and connected to the rear ends of the sending and discharging mud pipes 21 and 22 previously inserted in the pilot pipes 1 and 1, respectively. The hollow segment 2 with a temporary joint pipe is brought into contact with the rear wall surface of the excavator 9 and propelled by a pressing jack 11 in the starting shaft A as shown in FIG. Excavate earth and sand between 1 and 1.

Thus, the hollow segment 2 with the temporary joint pipe is buried in the excavation site while excavating the earth and sand between the pilot pipes 1 and 1. After the hollow segment 2 is buried, the next hollow segment 2 with the temporary joint pipe is inserted. The front and rear plate pieces 2c that are closely attached to each other,
By connecting the bolt mounting holes 3c and 3d of the 2d with each other by bolts, the propulsion is carried out, and this operation is repeated, and a temporary joint is formed on one side of the cross-sectional outer shell position of the underground structure between the shafts A and B. The hollow segments with tubes 2 are embedded in series. At this time, a pump and a sedimentation tank (not shown) are provided on the side of the arrival shaft B to be connected to and communicate with the mud pipes 21 and 22 in the pilot pipes 1 and 1. 9e is used to discharge the excavated earth and sand through the mud pipe 22 with the mud supplied to the inside of the pipe 9e. And remove the excavated earth and sand by connecting the remaining mud pipes.

It should be noted that the temporary joint pipe 8 may be propelled by another pressing jack when the hollow segment 2 with the temporary joint pipe is propelled. However, the guide ridge 8a is previously bolted to the female joint 2b of the hollow segment 2. It is configured such that the bolts are removed after being buried after being integrated by joining. In this bolt connection, a worker enters the temporary joint pipe 8 or the hollow segment 2 to perform the connection operation. The same applies to bolt removal work.

When the plurality of hollow segments 2 with temporary joint pipes are buried in one side of the planned underground structure in a state of being connected in series in this way, the temporary joint pipes 8 of the hollow segments 2 are thereafter A state in which the front ends of the two-side opening chambers 9b and 9c of the excavator 9 are in contact with the rear end face of the adjacent pilot pipe 1 buried at a position having a certain interval (joint interval) from the temporary joint pipe 8. The embedding operation is performed in the same manner as described above, with the hollow segment 2 with the temporary joint pipe to be buried next to the excavator 9.

That is, the hollow segment 2 with the temporary joint pipe which is made to follow the excavator 9 is propelled by the pressing jack 11, and the front ground is excavated by the auger screw 9d of the excavator 9, and the earth and sand is buried first. A mud feed pipe 21 provided in the temporary joint pipe 8 and a mud feed short pipe 9f in the opening chamber 9b of the excavator 9 connected to the mud feed pipe 21; a drilling chamber 9e;
The hollow segment 2 with the temporary joint pipe is buried in the excavation trace while discharging through the drain pipe 22 in the pilot pipe 1 in the same manner as described above. Then, the temporary joint pipe 8 and the pilot pipe 1 of the previously buried hollow segment 2 are extruded toward the reaching shaft B as the excavator 9 excavates, and the female of the buried hollow segment 2 covered with the temporary joint pipe 8. Opening chamber 9b of excavator 9 and hollow segment 2 following it
The hollow segment 2 with the temporary joint pipe is propelled and buried in the excavation site while the male joint part 2a of the above is engaged.

After the hollow segment 2 is buried, the next hollow segment 2 with a temporary joint pipe is joined and closely joined to the front and rear plate pieces 2.
c and 2d are integrally connected by bolts and then propelled and buried in the excavation site, and this operation is repeated to engage the male joint 2a with the female joint 2b of the hollow segment row previously buried. The next row of hollow segments 2 with temporary joint pipes is buried between both shafts B and C. Then, the temporary joint pipe 8 of the hollow segment 2 on one side and the temporary joint pipe 8 are formed by the hollow segment 2 with the temporary joint pipe embedded adjacent to the other side of the hollow segment row with the temporary joint pipe embedded on one side. Pilot pipe 1 buried at a position with a joint spacing from 8
And the hollow segment 2
The work which is embedded in the top floor section part juxtaposed state plan planned underground structures sequentially repeatedly performed in the width direction of the underground structures embedded to construction floor W ₁ on the underground construction as shown in FIG.
Although FIG. 1 shows a structure in which the hollow segments 2 are embedded in three rows, it is needless to say that the hollow segments 2 may be embedded in a plurality of rows in accordance with the above procedure.

After the hollow segments 2 are buried, the right and left adjacent hollow segments 2 and 2 are integrally connected by bolting. This operation is performed by a worker entering the hollow segments 2 and The male and female joints 2a and 2b of the hollow segments 2 and 2 are joined by bolts, but at the time of performing the jointing operation with bolts, even a little earth and sand has penetrated between the facing surfaces of the male and female joints 2a and 2b. And the bonding strength is weakened, as shown in FIG.
After removing the tip wall of the male joint 2a to remove the earth and sand,
A bolt mounting hole 3a formed in the other side wall of one hollow segment 2 and a bolt fastening plate 4 of the other hollow segment 2
The left and right hollow segments 2, 2 are firmly integrated by inserting a connecting bolt 12 between the bolt mounting hole 3b and a nut 13, and screwing the nut 13.

FIG. 9 shows another embodiment of the bolt connection structure. A bolt mounting plate 14 is fixed inside the female joint 2b of the hollow segment 2 so as to be close to the female joint 2b. Each of the bolt mounting holes 3a, 3b
And a plurality of bolt mounting holes 3e communicating with the holes. In order to connect the left and right hollow segments 2 and 2 to each other, the distal end wall surface of the male joint portion 2a is cut off in the same manner as described above, and the distal end surface of the male joint portion 2a is connected to the female joint portion 2b of the other hollow segment 2. And the bolt mounting hole 3b of the bolt fastening plate 4 of one hollow segment 2 and the bolt mounting hole of the bolt mounting plate 14 of the other hollow segment 2.
A long connecting bolt 16 is inserted between the nut 3e and the nut 17 and is screwed with a nut 17. In this case, as shown in FIG. 10, the male joint portion 2a of one hollow segment 2 is entirely cut off, and the one end female joint portion 2b of the hollow segment 2 is connected to the female joint portion of the other hollow segment 2. Weld 18 to the upper and lower ends of part 2b
May be.

[0031] After construction of the floor W ₁ on the underground structures by the hollow segments 2, as described above, as shown in FIG. 11,
Side walls W ₂ of the underground structures at both side ends below the upper floor W _1, W sequentially construction and ₂ and the lower floor W _3. In this case, top floor W both side wall portions on the outer end part surface of the hollow segments 2 forming the side edge portions of ₁
Since W _2, W ₂ connects the upper end of the hollow segments 2 forming the, in the hollow segments 2 forming both outer portion of the upper floor W _1, female 7 on the lower surface of the outer end The joint 2b is formed. The same applies to the hollow segments 2 forming the outer sides of the lower floor W _3.

The side walls W ₂ , W ₂ and the lower floor W ₃
In the same manner as in the above-mentioned upper floor construction work, the temporary joint pipe 8 fitted to the female joint portion 2b of the hollow segment 2 already buried and the temporary joint pipe 8 with a joint interval are provided. The buried pilot pipe 1 is pushed out to the other shaft B side, and the earth between the temporary joint pipe 8 and the pilot pipe 1 is excavated by the excavator 9 while the side walls W ₂ , W ₂ and the lower floor are excavated. in which sequentially embedding the pilot tube 1 in construction position of W _3.
Also in the pilot pipe 1,1, ... which form the side wall portions W _2, W ₂ and the lower floor W _3, are integrally connected by bolts fastening the pilot tube 1 adjacent to each other around in the same manner described above . Note that after construction of the top floor W _1, both side wall portions W _2, W ₂ and the lower floor
Were sequentially construction and W _3, it is of course also made different this sequence may construction of the underground construction. Also, the connection may be made by a PC steel wire instead of a bolt.

[0033] Thus, planning top floor W ₁ is embedded in the cross-sectional position of underground structures, both side wall portions W _2, W _2, as required under the floor W ₃ numerous steel hollow segment 2 linked together to form a After assembling the reinforcing steel bars and the like, concrete 19 is poured into the inside, filled and hardened. After filling of the concrete, top floor W _1, both side wall portions W _2, W _2, drilling the internal sediment enclosed under floor W ₃ from the vertical shaft side, exclusion to be construction of the underground construction as shown in FIG. 12 Things. At this time, the cast concrete is filled through the front and rear plate pieces 2c and 2d of each hollow segment 2, and the adjacent hollow segments 2 and 2 are further connected and integrated to form an underground structure having excellent rigidity and high strength. It can be built.

In the above embodiment, the pilot pipe 1 for replacing the hollow segment 2 is buried at every joint interval of the hollow segment 2, but the pilot pipe 1 may be provided between them. Further, the pilot pipes 1 are closely buried in a state where the opposing side surfaces are joined to each other, and a plurality of pilot pipes 1 are used without using the excavator 9.
The pilot tube 1 may be replaced by directly abutting the front end surface of the hollow segment 2 with the temporary joint tube on the rear end surface and propelling.

The underground structure, as shown in FIG.
The present invention is not limited to the rectangular cross-section, but can be constructed in the same manner as described above even when the cross-section is circular. For example, as shown in FIG. 13, pilot pipes 1 ′ are buried at regular intervals in a planned outer shell between both shafts, and then, as shown in FIG. 14, hollow segments 2 ′ that are curved in the width direction are formed. It may be replaced with the pilot tube 1 '. In this case, except that the hollow segment 2 'is curved in the width direction, the hollow segment 2' has the same male and female joint portion and the temporary joint tube as the hollow segment 2.

[0036]

As described above, according to the method for constructing an underground structure of the present invention, when replacing a pilot pipe with a hollow segment while pushing the pilot pipe buried between the shafts by pushing the hollow segment, Since the temporary joint pipe is fitted to the joint part formed on the side of the hollow segment and is integrally propelled, the joint part is covered with the temporary joint pipe without being exposed in the ground. It can be buried in a part of the cross-sectional shell position of the planned underground structure, and when burying the next row of hollow segments adjacent to the buried hollow segment, one side of the hollow segment While extruding the temporary joint pipe so that the joint section of the temporary joint pipe follows the temporary joint pipe of the buried hollow segment, the joint sections covered with the temporary joint pipe are engaged with each other and the opposed joint sections are engaged with each other and propelled. Therefore, even if the pilot pipe is buried with some deviation in the vertical and horizontal directions, regardless of the pilot pipe, both hollow segments are connected to the outside of the planned underground structure by engaging the male and female joints. It can be accurately buried in the shell position.

At this time, while pushing the temporary joint pipe covering the joint portion of the previously buried hollow segment, the opposed joint portion of the next row of hollow segments is engaged with this joint portion as described above. Since the hollow segments are propelled, the hollow segments can be smoothly propelled while preventing the earth and sand from entering the engaging portions of the male and female joint portions by the temporary joint pipe.

Further, since the segment is hollow, it is lightweight, which improves transportability and other handling properties and workability, and is suitable for building a large-sized segment to build a large-sized underground structure. Above, adjacent hollow segments buried side by side at the cross-sectional position of the planned underground structure are connected to the male and female joints together with the joints together, and concrete is filled into the hollow segments, so it is strong. It is possible to build a simple underground structure.

Furthermore, as described in claim 2, by providing a through hole through which the worker can enter and leave the hollow segment and by providing a bolt mounting hole, the worker can enter the hollow segment after embedding. The joint operation of the joint portions of the hollow segments joined to each other can be performed by bolts, and after the connection, as described above, when the hollow segments are filled with concrete, the adjacent hollow segments are further filled with the concrete filled through the through holes. It is a firm integration.

[Brief description of the drawings]

FIG. 1 is a simplified vertical sectional front view of a state in which a pilot pipe is buried,

FIG. 2 is a simplified vertical sectional side view showing a state where a pilot pipe and a segment member are replaced.

FIG. 3 is a partially cutaway perspective view of a hollow segment.

FIG. 4 is a perspective view showing a state in which a temporary joint pipe is provided.

FIG. 5 is a partial cross-sectional view of a state where the segment member is buried by excavation of an excavator,

FIG. 6 is a simplified longitudinal side view of an excavator,

FIG. 7 is a simplified longitudinal front view of a state in which the upper wall of the underground structure is constructed, and then the next wall is constructed.

FIG. 8 is a longitudinal sectional front view of a main part showing a connection structure between segment members,

FIG. 9 is a longitudinal sectional front view of a main part showing a modified example thereof,

FIG. 10 is a longitudinal sectional front view of a main part showing still another modification.

FIG. 11 is a simplified vertical front view of a state in which a wall of an underground structure is formed by hollow segments.

FIG. 12 is a vertical sectional front view of an underground structure;

FIG. 13 is a simplified vertical sectional front view of a buried state of a pilot pipe showing another construction example of the present invention;

FIG. 14 is a simplified vertical sectional front view for explaining a case in which a segment member is replaced.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pilot pipe 2 Hollow segment 2a, 2b Male-female joint part 3a-3e Bolt mounting hole 6, 7 Through hole 8 Temporary joint pipe 9 Excavator 12 bolt 19 Concrete

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-294290 (JP, A) JP-A-4-155094 (JP, A) JP-A-2-30886 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 9/04 E21D 13/02

Claims (2)

(57) [Claims] Claims: 1. A plurality of steel pilot pipes are buried between shafts at the outer shell position of an underground structure to be built, and these pilot pipes and steel hollow segments are replaced to replace the underground structure. A method of constructing, in which a hollow pilot pipe is buried at least in a joint portion of a hollow segment from one shaft to the other shaft in a successively penetrating state, and a male and female joint portion is formed at both end portions over the entire length. And the front end face of the male and female joint portion of the hollow segment formed by fitting the temporary joint tube to one of the joint portions is made to follow the pilot pipe corresponding to the male and female joint portion from one of the shafts to temporarily join the hollow segment. The pilot tube is pushed out to the other shaft side by propelling toward the other shaft side integrally with the tube to replace the hollow segment and the pilot tube, and then adjacent to the buried hollow segment. The front end face of the joint portion where the temporary joint pipe of the next hollow segment is not provided is followed by the rear end face of the temporary joint pipe of the buried hollow segment, and the temporary joint pipe is followed by the rear end face of the pilot pipe for propulsion. Thereby, the temporary joint pipe of the buried hollow segment is pushed out toward the other shaft, the joint part of the propulsion hollow segment is engaged with the joint part covered with the temporary joint pipe, and the temporary joint pipe of the hollow segment is fitted. The propulsion hollow segment is buried while pushing out the pilot pipe on the other end side that has been combined, and the next hollow segment is protruded in the same manner as described above adjacent to the buried hollow segment in the same manner as described above, and the burial operation is repeatedly performed to carry out the planned underground. After burying a hollow segment row in which male and female joints are engaged with each other at the cross-sectional outer shell position of the structure, the adjacent hollow segments are integrally connected. Hollow segment concrete was filled in, accordingly after, construction method of underground structures, characterized in that excavating ground surrounded by segments column. 2. The hollow segment according to claim 1, wherein a through hole through which an operator can enter and leave is provided in the hollow segment, and a bolt mounting hole is provided, and adjacent hollow segments are connected from within the hollow segment by bolts. How to build underground structures.