JP6262956B2 - Construction method for underground structures - Google Patents

Description

The present invention relates to an underground structure and a construction method thereof, and more particularly to a construction method of an underground structure that is formed into a cylindrical shape by a plurality of segments and is installed in the ground .

Conventionally, a vertical shaft installed in the vertical direction or a horizontal shaft installed in the horizontal direction (both are collectively referred to as “underground structures” in the present invention) are formed by joining a plurality of segments. It is formed by laminating an annular body.
Then, through holes for joining are formed on both side surfaces (circumferential surfaces) and both end surfaces (axial surfaces) of the inner peripheral surface of the segment, and in the state where adjacent segments are in contact with each other, The annular body is firmly formed by passing through the coupling bolt and screwing the coupling nut into this, and the annular body is firmly laminated (hereinafter collectively referred to as “connection”) There).
Then, the inventors of this application are disclosing the underground structure which can simplify handling (storage, conveyance, etc.) and construction work of construction materials (for example, refer patent document 1).

Japanese Patent No. 4841702 (page 5-6, FIG. 3)

That is, in the invention disclosed in Patent Document 1, a concave portion opened on the outer surface side of a segment (annular body) is formed, and a through hole reaches the concave portion (between the concave portion and the side surface, the concave portion and the end surface). Since the through-holes are formed between the two, the builder can connect the segments on the ground (on the outer surface side of the annular body).
For this reason, the invention disclosed in Patent Document 1 installs a scaffold on the inner surface side of an existing annular body, connects the segments on the inner surface side of the annular body, and stacks the annular body. By eliminating the work of removing the scaffold installed on the inner surface side or installing it again, there is a remarkable effect that the construction work can be simplified.
However, since the invention disclosed in Patent Document 1 is installed on the outer surface side (underground side), since the annular body is installed in the ground, it cannot be visually recognized from the inner surface side. There was a request to confirm that the connecting bolt was healthy over a long period of time, or to replace it if it deteriorated over time. Moreover, since it cannot be retightened, for example, when the connecting bolt is loosened during construction, there is a problem in strength.

The present invention responds to the above-described demand, and provides a construction method for an underground structure that eliminates the need for installing a scaffold on the inner surface side of the annular body and enables inspection and replacement of the connecting bolt. With the goal.

( 1) The underground structure construction method according to the present invention is an underground structure in which an underground structure formed by laminating an annular body in which a plurality of segments are connected in the circumferential direction is stacked in the vertical direction. A construction method of an object,
The segment is formed near a pair of side surfaces symmetrical to each other and a pair of end surfaces symmetrical to each other, an outer surface joint formed near the outer surface of the annular body on the side surface, and an outer surface of the annular body on the end surface. An outer end surface joint, an inner surface joint formed near the inner surface of the annular body of the side surface, and an inner end surface joint formed near the inner surface of the annular body of the end surface,
A step of temporarily connecting the plurality of segments at the outer surface joint on the ground to form an annular body, and temporarily connecting the annular body to a lower annular body that has already been temporarily connected at the outer end joint; ,
Press-fitting the temporarily connected annular body into the ground;
Repeating the step of temporarily connecting and the step of press-fitting into the ground, and installing a predetermined number of layers of the annularly connected annular body in the ground;
After the step of installing the predetermined number of layers of the temporarily connected annular body in the ground, the predetermined number of layers of the temporarily connected annular body is disposed below the annular body disposed above. Sequentially connecting the segments forming the annular body at the inner surface joint and the inner end surface joint toward the annular body;
It is characterized by having.

( 2 ) In the above ( 1 ), by storing water inside the predetermined number of layers of the annularly connected annular body, floating a working buoyancy body in the water, and discharging the water The main coupling step is performed on the buoyancy body while lowering the surface of water and the buoyancy body.

  (I) In the underground structure according to the present invention, since the underground structure is connected to the segments on both the inner peripheral side and the outer peripheral side, the connecting bolt installed on the inner surface side is visually recognized from the inner surface side. can do. For this reason, since the inspection with time can be performed, the maintainability of the underground structure is improved. Further, when the deterioration of the connecting bolt installed on the inner surface side is found, it can be replaced, so that long-term reliability is improved. Furthermore, even if the connecting bolt is loosened when the annular body is press-fitted during construction, the connecting bolt can be installed on the inner side, so there is no concern about strength reduction.

(Ii) Further, since the segments are connected in the vertical direction by the end surface protrusions formed on one end surface entering the end surface holes formed on the other end surface, the operation is easy and quick.
(Iii) Moreover, since the outer side joint screw and the inner side joint screw corresponding to the connection nut are installed in advance, it is not necessary to prepare the connection nut at the construction site, so that the management of the construction material becomes easy. .
(Iv) Since the number of outer side joints is smaller than the number of inner side joints, the segments are temporarily connected at the outer side joints, and the segments are finally connected at the inspectable inner side joints. It is possible to minimize the amount of materials used and to reduce manufacturing costs and construction costs.

(V) Further, in the construction method of the underground structure according to the present invention, on the outside, the segments are temporarily connected to form temporarily connected annular bodies, which are sequentially press-fitted into the ground, When the annular body of the number of layers temporarily connected is installed in the ground, the main body is sequentially connected from the annular body arranged at the upper side to the annular body arranged at the lower side.
Therefore, since temporary connection is performed on the ground, a scaffold for temporary connection or the like is not necessary, and the operation becomes easy and quick.
In addition, once the predetermined number of temporarily connected annular bodies are installed in the ground, the main connection is performed on the inner side. Therefore, after completion of excavation and the like inside the annular body, Connection will be carried out, the construction process will be simplified, and the construction period will be shortened. That is, every time an annular body of one layer is temporarily connected, if the main connection is attempted on the inner side, the excavation work and the main connection work on the inner side interfere with each other. Such as unnecessary removal and rearrangement.
In particular, since the underwater concrete can be installed at the bottom and the main connection can be carried out in accordance with the curing period of the underwater concrete, the construction period is further shortened.
In the present invention, the terms “temporary connection” and “main connection” are used separately for convenience of explanation, but both are permanent fastenings that form underground structures, Means fastening mainly for maintaining the shape of the underground structure, and “mainly connected” means fastening mainly for maintaining the strength and rigidity of the underground structure. The shape, strength and rigidity are maintained.

  (Vi) Further, this connection is performed on the buoyancy body while floating the buoyancy body for working on the water stored in the annular body and lowering the surface of the water and the buoyancy body by discharging the water. Therefore, there is no need to install a scaffold or the like on the inside, the work is simple and quick, and unnecessary construction materials are not required, so that the construction cost can be reduced and the construction period can be shortened. The buoyancy body is a ship, a anchor or the like.

The side view which shows the construction condition explaining the underground structure which concerns on Embodiment 1 of this invention. The front view which shows the annular body which comprises the underground structure shown in FIG. The member (segment) which comprises the underground structure shown in FIG. 1 is shown, (a) is a side view on the outer surface side, (b) is a front view, and (c) is a side view on the inner surface side. The side view which shows the temporary connection of the member (segment) which comprises the underground structure shown in FIG. Sectional drawing of the side view which shows the construction point of the underground structure shown in FIG. The front view which shows the underground structure (annular body) which concerns on Embodiment 2 of this invention. 6 shows members (segments) constituting the underground structure shown in FIG. 6, (a) is a side view on the outer surface side, (b) is a front view, (c) is a side view on the inner surface side, (d) and ( e) End view. The member (segment) which comprises the underground structure which concerns on Embodiment 3 of this invention is shown, (a) is a side view on the outer surface side, (b) is a front view, (c) is a side view on the inner surface side, (D) and (e) are end views.

[Embodiment 1]
1 to 5 illustrate an underground structure according to Embodiment 1 of the present invention. FIG. 1 is a side view schematically showing a construction situation, and FIG. 2 constitutes the underground structure. 3A is a front view showing an annular body, FIG. 3A is a side view of an outer surface showing members (segments) constituting the underground structure, and FIG. 3B is a member (segments) constituting the underground structure. 3) is a side view of the inner surface side showing the members (segments) constituting the underground structure, and FIG. 4 is a temporary connection of the members (segments) constituting the underground structure. The side view to show and (a)-(d) of FIG. 5 are sectional drawings of the side view which shows the construction point of an underground structure according to a process. In addition, the same code | symbol is attached | subjected to the same part or corresponding part in each following figure, and one part description is abbreviate | omitted. Further, there is a diagram in which a part of the code is omitted. Moreover, since each part is drawn typically, this invention is not limited to the drawn form.

(Underground structure)
In FIG. 1, the underground structure 300 is installed in the underground 90 by the press-fitting and sinking device 8, and annular bodies 200 g, 200 h and the like in which the segments 100 are connected in the circumferential direction are stacked in the vertical direction. It is the cylindrical body joined mutually.
The press-fitting device 8 is a device stand 8a joined to the ground 90 so as not to be lifted, a lift arm 8b which is guided by the device stand 8a and lifts and lowers, and is installed on the lift arm 8b to press-fit the annular body 200 into the ground 90. It has a press-fit jack 8c and a hydraulic unit 8d that drives the lifting arm 8b, the press-fit jack 8c, and the like.
For the convenience of the following description, what forms the uppermost layer is referred to as “annular body 200h”, directly below it as “annular body 200g”, and directly below it as “annular body 200f”. The structure 300 does not limit the number of the annular bodies 200h or the like (the number of stacked layers).
That is, when the annular body 200f sinks (press-fits) by a predetermined distance, the elevating arm 8b is lifted, the annular body 200g is placed on the annular body 200f, and both are joined together. The ring body 200h is laminated in the same manner by sinking (press-fitting) by a distance.
In the description of the common content, the description of the subscripts “f, g, h” may be omitted.

(Annular)
In FIG. 2, an annular body 200 is obtained by connecting a plurality of segments 100 on the side surfaces. The number of segments 100 forming the annular body 200 is not limited.
Hereinafter, for convenience of explanation, the case where the annular body 200 is cylindrical and the segments 100 have the same shape will be described. However, the annular body 200 is not limited to the cylindrical shape, It may be non-circular (ellipse, rectangle, oval, polygon, etc.) in plan view.
In addition, the segments are not the same in shape, and may not be arcuate in plan view (for example, “U” or “H” in front view). The portion may be a flat plate (rectangular shape in plan view) and the rest may be arc-shaped, square-shaped, or square-shaped in front view.

(segment)
In FIGS. 3A to 3C, the segment 100 has a so-called “Yatsuhashi” shape with a circular arc cross section. That is, the outer surface 10 having an arc-shaped cross section, the inner surface 20 having an arc-shaped cross section, the side surfaces 30 and 40 straddling the outer surface 10 and the inner surface 20, and the inner surface 20, the outer surface 10 and the end portions of the side surfaces 30 and 40 are straddled. Ribbed end surfaces 50 and 60 are provided. At this time, the side surface 30 and the side surface 40 are plane symmetric, the end surface 50 and the end surface 60 are plane symmetric, and the center of curvature of the outer surface 10 and the center of curvature of the inner surface 20 coincide with each other. It has become.

(Side joint)
The side surface 30 of the segment 100 is provided with an outer surface joint 31 straddling the outer surface 10 and an inner surface joint 32 straddling the inner surface 20. In addition, although the outer side surface joint 31 is provided in one place and the inner side surface joint 32 is provided in two places, this invention does not limit those quantity.
The outer surface joint 31 covers an outer surface recess 31 a formed at a corner between the outer surface 10 and the side surface 30, and a part on the side surface 30 side of the outer surface recess 31 a, and forms an outer surface that is substantially the same as the side surface 30. A joint plate 31b and an outer surface joint hole 31c which is a through hole formed in the outer surface joint plate 31b are provided.
The inner surface joint 32 covers an inner surface recess 32 a formed at the corner between the inner surface 20 and the side surface 30, and a part of the inner surface recess 32 a on the side surface 30 side, and forms an approximately same surface as the side surface 30. A joint plate 32b and an inner surface joint hole 32c which is a through hole formed in the inner surface joint plate 32b are provided.

Similarly, the side surface 40 of the segment 100 is provided with an outer surface joint 41 straddling the outer surface 10 and an inner surface joint 42 straddling the inner surface 20.
The outer surface joint 41 includes an outer surface recess 41a, an outer surface joint plate 41b, and an outer surface joint hole 41c. The inner surface joint 42 includes an inner surface recess 42a, an inner surface joint plate 42b, and an inner surface. And a joint hole 42c.

(End face joint)
The end surface 50 of the segment 100 is provided with an outer end surface joint 51 straddling the outer surface 10 and an inner end surface joint 52 straddling the inner surface 20. In addition, although the outer end surface joint 51 is provided in three places and the inner end face joint 52 is provided in three places, this invention does not limit those quantity.
The outer end surface joint 51 covers an outer end surface recess 51a formed at a corner between the outer surface 10 and the end surface 50, and a part on the end surface 50 side of the outer end surface recess 51a, and forms an outer surface substantially the same as the end surface 50. A joint plate 51b and an outer end surface joint hole 51c, which is a through hole formed in the outer end surface joint plate 51b, are provided.
The inner end surface joint 52 covers an inner end surface recess 52a formed at a corner between the inner surface 20 and the end surface 50, and a part of the inner end surface recess 52a on the end surface 50 side, and forms an inner surface substantially the same as the end surface 50. A joint plate 52b and an inner end surface joint hole 52c which is a through hole formed in the inner end surface joint plate 52b are provided.

Similarly, the end surface 60 of the segment 100 is provided with an outer end surface joint 61 straddling the outer surface 10 and an inner end surface joint 62 straddling the inner surface 20.
The outer end surface joint 61 includes an outer end surface recess 61a, an outer end surface joint plate 61b, and an outer end surface joint hole 61c. The inner end surface joint 62 includes an inner end surface recess 62a, an inner end surface joint plate 62b, and an inner end surface. And a joint hole 62c.

(Temporary concatenation of segments in the circumferential direction)
4, the side surface 30 of the adjacent segment 100 (hereinafter referred to as “segment 100a” for convenience of description) and the side surface 40 of segment 100 (hereinafter referred to as “segment 100b” for convenience of description) forming the annular body 200h. A procedure for temporarily connecting (assuming assembling) the two will be described.
The segment 100a and the segment 100b are placed in a state where the side surface 30 of the segment 100a and the side surface 40 of the segment 100b are in contact with or close to each other on the top surface of the annular body 200g that has already been laminated.
And the circumferential direction is connected in the outer surface joint 31 of the segment 100a and the outer surface joint 41 of the segment 100b. That is, a connection bolt (not shown) is arranged in the outer surface recess 31a of the outer surface joint 31, a connection nut (not shown) is arranged in the outer surface recess 41a of the outer surface joint 41, and the outer surface joint holes 31c and 41c are formed. The connecting nut is screwed into the penetrating connecting bolt.
Similarly, the side surface 40 of the segment 100a and the side surface 30 of the segment 100 adjacent thereto are temporarily connected, and the side surface 30 of the segment 100b and the side surface 40 of the segment 100 adjacent thereto are temporarily connected. Further, similarly, all the segments 100 are temporarily connected in the circumferential direction, and the annular body 200h is temporarily assembled.

(Temporary connection of segments in the vertical direction)
4, end surfaces 60 of adjacent segments 100 forming the annular body 200h (hereinafter referred to as “segment 100a” for convenience of description) and segments 100 forming the annular body 200g (hereinafter referred to as “segment 100c, A description will be given of a procedure for temporarily connecting (provisionally assembling) the two by contacting the end surface 50 (referred to as “100d”).
The segment 100a (forming the annular body 200h) installed on the end faces 50 of the segments 100c and 100d forming the annular body 200g is disposed.
Then, the outer end face joint 51 of the segment 100c of the annular body 200g and the outer end face joint 61 of the segment 100a of the annular body 200h, and the outer end face joint 51 of the segment 100d of the annular body 200g and the annular body 200h are positioned below. In the outer end surface joint 61 of the segment 100a, the vertical direction is temporarily connected.
That is, a connecting bolt (not shown) is arranged in the outer end surface recess 51a of the outer end surface joint 51, a connecting nut (not shown) is arranged in the outer end surface recess 61a of the outer end surface joint 61, and the outer end surface joint holes 51c and 61c are formed. The connecting nut is screwed into the penetrating connecting bolt.

Similarly, the outer end joint 51 of the segment 100d of the annular body 200g and the outer end joint 61 of the segment 100a of the annular body 200h are connected in the vertical direction.
Further, similarly, the outer end surface joint 51 of the segment 100 of the annular body 200g and the outer end surface joint 61 of the segment 100 of the annular body 200h are temporarily connected to each other to temporarily connect the annular body 200g and the annular body 200h. .

  In the above, first, the annular body 200g temporarily connected in the circumferential direction is formed, and then the segment 100 forming the annular body 200h temporarily connected in the circumferential direction is changed to the segment 100 forming the annular body 200g. Although temporarily connected in the up-down direction, the present invention is not limited to this, and after the segment 100 is placed on the annular body 200 g temporarily connected in the circumferential direction and temporarily connected in the up-down direction, The annular body 200h may be formed by temporary connection in the circumferential direction.

(Temporary assembly of underground structures)
As described above, the underground structure 300 is temporarily assembled by temporarily connecting the segment 100 in the circumferential direction at the outer surface joints 31 and 41 and in the vertical direction at the outer end surface joints 51 and 61. That is, since temporary assembly of the underground structure 300 can be performed outside the underground structure 300 (annular body 200), a scaffold or the like is installed inside the underground structure 300 (annular body 200). It can implement on the ground 91, without.

(Mainly consolidated in the circumferential direction of the segment)
Next, a description will be given of how to temporarily connect the temporarily connected segments 100a and the like in the circumferential direction (not shown).
That is, the circumferential direction is fully connected at the inner side joint 32 of the segment 100a and the inner side joint 42 of the segment 100b. That is, a connecting bolt (not shown) is arranged in the inner side concave portion 32a of the inner side joint 32, a connecting nut (not shown) is arranged in the inner side concave portion 42a of the inner side joint 42, and the inner side joint holes 32c and 42c are formed. The connecting nut is screwed into the penetrating connecting bolt.
Similarly, the side surface 40 of the segment 100a and the side surface 30 of the segment 100 adjacent thereto are main-connected, the side surface 30 of the segment 100b and the side surface 40 of the segment 100 adjacent thereto are main-connected, and all the segments 100 are connected. The main body is connected in the circumferential direction, and the annular body 200 is finally assembled.

(Main link in the vertical direction of the segment)
In the inner end face joint 52 of the segment 100c of the annular body 200g and the inner end face joint 62 of the segment 100a of the annular body 200h, and also in the inner end face joint 52 of the segment 100d of the annular body 200g and the inner end face of the segment 100a of the annular body 200h. In the joint 62, the vertical connection is made.
That is, a connecting bolt (not shown) is arranged in the inner end face recess 52a of the inner end face joint 52, a connecting nut (not shown) is placed in the inner end face recess 62a of the inner end face joint 62, and the inner end face joint holes 52c and 62c are formed. The connecting nut is screwed into the penetrating connecting bolt.

Similarly, in the inner end face joint 52 of the segment 100d of the annular body 200g and the inner end face joint 62 of the segment 100a of the annular body 200h, and the inner end face joint 52 and the annular body 200h of the segment 100d of the annular body 200g. In the inner end face joint 62 of the segment 100a, the vertical direction is fully connected.
Further, the inner end face joint 52 of the segment 100 of the annular body 200g and the inner end face joint 62 of the segment 100 of the annular body 200h are finally connected to each other, and the annular body 200g and the annular body 200h are finally connected. To do.

  In the above, first, the annular body 200g that is permanently connected in the circumferential direction is formed, and then the segment 100 that forms the annular body 200h that is permanently coupled in the circumferential direction is changed to the segment 100 that forms the annular body 200g. However, the present invention is not limited to this, and the segment 100 is placed on the annular body 200g that is permanently connected in the circumferential direction, and this is permanently connected in the vertical direction. Thereafter, the annular body 200h may be formed by main connection in the circumferential direction.

(Main assembly of underground structure)
By connecting the segment 100 in the circumferential direction at the inner side joints 32 and 42 and in the vertical direction at the inner end face joints 52 and 62, respectively, the segment 100 is finally connected in the circumferential direction and the vertical direction as described above. Thus, the underground structure 300 is fully assembled. That is, the main assembly of the underground structure 300 is performed inside the underground structure 300 (annular body 200) (this will be described in detail separately).

(Function and effect)
As described above, the underground structure 300 is connected to the segments 100 on both the inner peripheral side and the outer peripheral side. Therefore, since the connecting bolt installed on the inner surface side can be visually recognized from the inner surface side, inspection over time can be performed, and thus the maintenance of the underground structure 300 is improved. Further, when the deterioration of the connecting bolt installed on the inner surface side is found, it can be replaced, so that long-term reliability is improved. Further, even if the connecting bolt is loosened when the annular body is press-fitted, the connecting bolt is installed on the inner side, so that it can be retightened, so there is no concern about strength reduction.

(Guidelines for underground structures)
In FIG. 5A, the underground structure 300 is such that the annular body 200 is temporarily connected on the ground 91 from the outer surface side.
In FIG. 5B, the uppermost annular body 200 h is press-fitted into the ground 90. At this time, working water 80 is stored inside the underground structure 300, and for example, the water surface 81 of the water 80 reaches the annular body 200g.
5 (a) and 5 (b), an inner surface joint 32 that is permanently connected to the inner surface side inner surface joint 42, and an outer end surface joint 51 and an outer end surface joint 61 that are temporarily connected to each other are provided. The inner surface side joint 42, the inner end surface joint 52, and the inner end surface joint 62 on the inner surface side that are solidly shown and are not temporarily connected are shown in white.
Therefore, as described above, since the work on the outer surface side of the annular body 200 can be performed on the ground 91, the construction is simple and quick.

In FIG. 5 (c), a working buoyancy body (not shown) is floated on the water surface 81, and the annular body 200h is permanently connected on the inner surface side by an operator (not shown) riding on the buoyancy body. .
That is, in FIG. 5C, the inner surface joint 32 that is permanently connected to the inner surface joint 42 of the annular body 200h, the inner end surface joint 52 of the annular body 200g that is permanently coupled to each other, and the inner surface of the annular body 200h. The end joint 62 is shown in a solid color.

  5D, a part of the water 80 is discharged, and the water surface 81 is lowered to the position of the annular body 200f. Therefore, the annular body 200g is permanently connected on the inner surface side by an operator riding on a buoyancy body (not shown). That is, in FIG. 5D, the inner surface joint 32 that is permanently connected to the inner surface joint 42 on the inner surface side of the annular body 200g, and the inner end surface joint 52 and the annular body of the annular body 200f that are permanently coupled to each other. A 200 g inner end face joint 62 is shown filled.

(Function and effect)
As described above, the underground structure 300 floats the working buoyant body on the water 80 stored inside, and rides on the buoyant body and sequentially performs the main connection work on the inner surface side downward. Because it is implemented, there is no need to install a special work scaffold.
In particular, when a predetermined number of layers of the annular body 200 are press-fitted into the ground 90, underwater concrete is installed at the bottom of the underground structure 300, and the underwater concrete needs to be cured for a predetermined period. Using this curing period, the main connection operation is sequentially performed from the upper annular body 200 toward the lower annular body 200 while draining the water 80 and lowering the water surface 81. For this reason, the work is simple and quick, and it is not necessary to provide a separate work time for the main connection. Moreover, since the curing period of underwater concrete is not simply added to the construction period, the construction period can be shortened.
Note that every time the annular body 200 is temporarily connected on the inner surface side every time the annular body 200 is temporarily connected on the outer surface side, buoyancy is generated on the water surface 81 (located at a height close to the ground 91) each time. It becomes necessary to float the body or install a scaffolding, which hinders work such as excavation.

[Embodiment 2]
6 and 7 illustrate an underground structure according to Embodiment 2 of the present invention. FIG. 6 is a front view showing the underground structure (annular body), and FIG. FIG. 7B is a front view showing members (segments) constituting the underground structure, and FIG. 7C is a ground view. FIGS. 7D and 7E are end views showing members (segments) constituting the underground structure, and are side views on the inner surface side showing the members (segments) constituting the intermediate structure.
In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted. Moreover, since each part is drawn typically, this invention is not limited to the drawn form.

(Annular)
In FIG. 6, an annular body 500 is formed by connecting a plurality of segments 400 on the side surfaces, and the annular body 500 is laminated to form an underground structure 600.
That is, the segment 400 is formed by changing the shape of the front view to a “<” shape and making the annular body 500 into a hexagonal shape.

(segment)
In FIGS. 7A to 7E, the segment 400 is different from the segment 100 (Embodiment 1) in the shape of the front view. Outer side joints 31 and 41 and inner side joints 32 and 42 are provided.
On the other hand, the end faces 50 and 60 are provided with end face projections 55 and end face holes 66 in place of the outer end face joints 51 and 61 and the inner end face joints 52 and 62.
That is, since the end surface protrusion 55 can enter the end surface hole 66, the end surface protrusion 55 of the segment 400 disposed below enters the end surface hole 66 of the segment 400 disposed above or is disposed below. When the end projection 55 of the segment 400 disposed above enters the end hole 66 of the segment 400, the segment 400 is connected (mainly connected) in the vertical direction.

(Function and effect)
Accordingly, since the vertical connection (temporary connection and main connection) is simplified, the manufacturing cost of the segment 400 is reduced, the construction is further simplified, and the construction work period is further shortened.

(Guidelines for underground structures)
The construction procedure of the underground structure 600 is obtained by replacing the temporary connection and the main connection in the vertical direction with the intrusion into the end surface hole 66 of the end surface protrusion 55 in the construction procedure of the underground structure 300. Since this temporary connection and this connection are the same as the underground structure 300, description is abbreviate | omitted.
Therefore, also in the underground structure 600, the same effect as the construction of the underground structure 300 in the first embodiment can be obtained.

[Embodiment 3]
FIG. 8 illustrates an underground structure according to Embodiment 3 of the present invention, and FIG. 8A is a side view of an outer surface side showing members (segments) constituting the underground structure, 8B is a front view showing a member (segment) constituting the underground structure, FIG. 8C is a side view of the inner surface showing the member (segment) constituting the underground structure, and FIG. 8 (d) and (e) are end views showing members (segments) constituting the underground structure. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2, or an equivalent part, and one part description is abbreviate | omitted.

(segment)
In FIG. 8, a segment 700 forms an annular body 500 and an underground structure 600 instead of the segment 400 in the second embodiment.
One side surface 30 of the segment 700 is provided with an outer surface joint 71 near the outer surface 10 and an inner surface joint 72 near the inner surface 20. In addition, although the outer side surface joint 71 is provided in one place and the inner side surface joint 72 is provided in two places, this invention does not limit those quantity. The configuration excluding the outer side joint 71 and the inner side joint 72 is the same as that of the segment 400 (Embodiment 2).

The outer surface joint 71 has an outer surface joint plate 71b, an outer surface joint screw 71c formed on the outer surface joint plate 71b, and a hole (not shown) formed at the position of the outer surface joint screw 71c. Yes. Similarly, the inner surface joint 72 includes an inner surface joint plate 72b, an inner surface joint screw 72c formed on the inner surface joint plate 72b, and a hole (not shown) formed at the position of the inner surface joint screw 72c. Have.
The outer side joint screw 71c and the inner side joint screw 72c may be formed directly on the outer side joint plate 71b and the inner side joint plate 72b, or may be formed on the outer side joint plate 71b and the inner side joint plate 72b, respectively. A nut may be fixed by welding at the position of the through hole.

(Temporary concatenation of segments in the circumferential direction)
The segment 700 is obtained by changing the outer surface joint 31 and the inner surface joint 32 of the segment 400 in Embodiment 2 to the outer surface joint 71 and the inner surface joint 72, respectively. It becomes the point of.
That is, in a pair of segments 700 to be temporarily connected in the circumferential direction, a connection bolt (not shown) is disposed in the outer surface recess 41a of the outer surface joint 41 of one segment 700, and the connection bolt is connected to the outer surface joint hole 41c. And is screwed into the outer surface joint screw 71c of the outer surface joint 71 of the other segment 700. Therefore, such temporary connection can be performed on the ground 91 from the outer peripheral side of the annular body 500.

(Mainly consolidated in the circumferential direction of the segment)
Further, the main connection in the circumferential direction of the segment 700 is performed by arranging a connection bolt (not shown) in the inner side concave portion 42a of the inner side joint 42 of one segment 700 in the pair of segments 700 to be main connected in the circumferential direction. Then, the connecting bolt is passed through the inner side joint hole 42 c and screwed into the inner side joint screw 72 c of the inner side joint 72 of the other segment 700. Therefore, the main connection can be sequentially performed from the upper side to the lower side on the inner peripheral side of the annular body 500 on the buoyant body floating on the water surface 81 as described above.

(Function and effect)
As described above, in the segment 700, the outer side joint 31 and the inner side joint 32 of the segment 400 in the second embodiment are previously installed with the “outer side joint screw 71c and inner side joint screw 72c corresponding to the connecting nut”. Since the outer side joint 71 and the inner side joint 72 are changed, it is not necessary to prepare a connection nut at the construction site, and management of construction materials is facilitated.
And since the construction procedure of the underground structure 600 using the segment 700 is the same as the construction procedure of the underground structure 600 using the segment 400, it is the same as the construction of the underground structure 300 in the first embodiment. The effect of this can be obtained.

  Since the present invention has the above-described configuration, it is not necessary to install a scaffold on the inner surface side of the annular body, and it is possible to check and replace the connecting bolt. Can be widely used as.

8 Press-in installation device 8a Device stand 8b Elevating arm 8c Press-in jack 8d Hydraulic unit 10 Outer surface 20 Inner surface 30 Side surface 31 Outer side joint 31a Outer side surface recess 31b Outer side surface joint plate 31c Outer side surface joint hole 32 Inner side surface joint 32a Inside side surface recess 32b Inside Side joint plate 32c Inner side joint hole 40 Side 41 Outer side joint 41a Outer side recess 41b Outer side joint plate 41c Outer side joint hole 42 Inner side joint 42a Inner side recess 42b Inner side joint plate 42c Inner side joint hole 50 End face 51 Outside End face joint 51a Outer end face recess 51b Outer end face joint plate 51c Outer end face joint hole 52 Inner end face joint 52a Inner end face recess 52b Inner end face joint plate 52c Inner end face joint hole 55 End face projection 60 End face 61 Outer end face joint 61a Outer end face recess 61b Outer end face Joint plate 61c Outer end face joint hole 62 Inner end face joint 62a Inner end surface recess 62b Inner end surface joint plate 62c Inner end surface joint hole 66 End surface hole 71 Outer side surface joint 71b Outer side surface joint plate 71c Outer side surface joint screw 72 Inner side surface joint 72b Inner side surface joint plate 72c Inner side surface joint screw 80 Water 81 Water surface 90 91 underground 100 segments (Embodiment 1)
100a segment 100b segment 100c segment 100d segment 200 annular body (Embodiment 1)
200f Ring body 200g Ring body 200h Ring body 300 Underground structure (Embodiment 1)
400 segments (Embodiment 2)
500 annular body (Embodiment 2)
600 Underground structure (Embodiment 2)
700 segments (Embodiment 3)

Claims (2)

It is a construction method of an underground structure in which an underground structure formed by laminating an annular body in which a plurality of segments are connected in the circumferential direction is stacked in the vertical direction,
The segment is formed near a pair of side surfaces symmetrical to each other and a pair of end surfaces symmetrical to each other, an outer surface joint formed near the outer surface of the annular body on the side surface, and an outer surface of the annular body on the end surface. An outer end surface joint, an inner surface joint formed near the inner surface of the annular body of the side surface, and an inner end surface joint formed near the inner surface of the annular body of the end surface,
A step of temporarily connecting the plurality of segments at the outer surface joint on the ground to form an annular body, and temporarily connecting the annular body to a lower annular body that has already been temporarily connected at the outer end joint; ,
Press-fitting the temporarily connected annular body into the ground;
Repeating the step of temporarily connecting and the step of press-fitting into the ground, and installing a predetermined number of layers of the annularly connected annular body in the ground;
After the step of installing the predetermined number of layers of the temporarily connected annular body in the ground, the predetermined number of layers of the temporarily connected annular body is disposed below the annular body disposed above. Sequentially connecting the segments forming the annular body at the inner surface joint and the inner end surface joint toward the annular body;
A construction method for an underground structure characterized by comprising: Water is stored in the predetermined number of layers of the annularly connected annular body, the working buoyancy body is floated on the water, and the water surface and the buoyancy body are lowered by discharging the water. while, the construction method of claim 1 underground structure, wherein the performing the process of the present coupling in on the buoyant body.

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