JPH03132565A - Building method for underground structure - Google Patents

Abstract

PURPOSE:To prevent collapse of a ground by a method wherein a roof member is pushed from at least one of a communicating tunnel and a continuous excavat ed hole built in a ground, and after the upper surface of the wall body of the continuous excavated hole is covered with the roof member, the interior of the wall body is excavated. CONSTITUTION:An excavating hole 3 is excavated in a spot, where a structure right below an existing structure 1 is to be constructed, from a vertical shaft 2. Thereafter, an endless continuous excavated hole 4 is excavated in succession to the excavated hole 3. A communicating tunnel 5 extending across the continuous excavated hole 4 through the center thereof is excavated. A cylindrical wall body 6 is built toward below from the continuous excavated hole 4 in a manner to surround a ground. Further, roof members 7... are pushed from the communicating tunnel 5 toward the continuous excavated hole 4 to cover the upper surface of the wall body 6 therewith. The roof members 7... are supported by temporary piles 9, and after support piles 12... are driven to support the room members 7, a structure is built in the wall body 6 as the interior of the wall body 6 is excavated.

Description

[Detailed Description of the Invention] [-Industrial Application Field] This invention relates to a method for constructing an underground structure for constructing a structure underground without affecting an existing structure such as a park. .

[Conventional technology] Conventionally, when constructing a structure such as a parking lot underground, the ground on which the structure is to be constructed is excavated from the ground to a predetermined depth, and the structure is placed in the excavated ground. The so-called open-cut construction method is used, which involves constructing something and then backfilling it with excavated earth and sand to return it to its original condition.

``Problem to be solved by the invention'' However, the conventional cut-and-cover method requires digging up the ground when constructing a structure, and when constructing a structure directly beneath an existing structure such as a park, If so, it would be necessary to close it for a long period of time, and it would not be possible to apply it to structures such as buildings. On the other hand, regarding conduits such as tunnels (normal tunnel method, Nordt;
] Is it possible to carry out construction while minimizing the impact on the existing structures of the ground-1-1 using methods such as the tunnel method? There are almost no examples of it being applied to such large-scale structures. In particular, with the rise in underground prices in recent years ('l'), various studies have been conducted on the effective use of underground areas, and t = 1 has been investigated, and there is a method of constructing a structure directly below the existing structure without adversely affecting it. The realization of this is awaited.

[Means for solving the problem 4-1 Therefore, the invention according to the first claim of the present invention provides a method for constructing a structure to be buried underground. After the excavated hole reaches the position where the structure is to be constructed, an endless continuous excavated hole is made in a shape that approximately corresponds to the outer periphery of the structure. , a connecting tunnel is constructed across this continuous excavation hole, and further, from the continuous excavation hole in the 1 direction:
, and build a wall that surrounds the ground, +i
Propel the roof member from at least one of the connecting tunnel or the continuous excavation hole to the other, cover the top surface of the wall by arranging the roof member in one direction, and then excavate the inside of the wall. The above-mentioned problem is attempted to be solved by a method of constructing an underground structure that involves constructing a structure.

Further, the invention according to the second claim (J, in the invention according to the first claim, wherein a connecting channel is constructed in a form that crosses the center of the continuous excavated hole, and further, the continuous excavated hole The upper surface of the wall is constructed by constructing a wall that surrounds the ground downward from the tunnel, and by driving a roof member radially from at least one of the central part of the connecting tunnel or the continuous excavation hole to the other. The above-mentioned problem is attempted to be solved by a method of constructing an underground structure in which the structure is constructed while excavating the inside of the wall after it is covered.

Furthermore, the invention according to claim 3 is the invention according to claim 1, in which, after the excavation hole reaches a position where the structure is to be constructed, the excavation hole substantially coincides with the outer periphery of the structure. Construct an endless continuous excavation hole in the form of an endless continuous excavation hole, and further construct a wall in the form of a wall surrounding the ground in one direction from the continuous excavation hole, and leave intervals in the circumferential direction of the continuous excavation hole. The roof parts +1 are fan-shaped inward from a plurality of points in the continuous excavation hole. 1
'.

We aim to solve the above problem by using a method of constructing a structure that allows the following to be carried out.

[One Embodiment] Hereinafter, refer to the drawings for an embodiment of the present invention.

1 to 7 are diagrams for explaining an embodiment of the method for constructing an underground structure according to the first claim. below,
The steps will be explained in order.

(1) Drilling of a guided drilling hole As shown in Figure 1, a vertical shaft 2 is excavated and constructed outside the site of an existing structure 1 such as a park, and a structure directly below the existing structure 1 is opened from this vertical shaft 2. An excavation hole 3 is excavated approximately horizontally at the same location where the hole 3 is to be constructed.

However, in this example, since it was not possible to secure a site for the construction of the shaft 2 on the site of the existing structure 1, the shaft 2 was excavated outside the site, or the construction site for the shaft 2 was built on the site. If it can be secured, the shaft 2 may be excavated within the site, or a passage may be constructed in place of the shaft 2 and the excavated hole 3. The point is that it is sufficient to be able to excavate continuous drilling holes, which will be described later, into the ground without having to excavate the ground directly adjacent to the location where the structure is to be constructed.

In addition, for the J-method of excavating the shaft 2 and the excavated hole 3, the well-known I method can be suitably applied depending on the construction conditions, and no special method is required. This also applies to continuous drilling holes described below.

(ii) Drilling of continuous drilling holes As shown in FIG. 2 (a), annular (endless) shape that approximately corresponds to the outer circumference of the structure to be constructed following the drilling hole 3.
A continuous drilling hole 4 is excavated into the ground directly under the existing structure I.

In this embodiment, the structure to be constructed has a circular outer shape in plan view, and the continuous excavated holes 4 are formed into an oak shape as shown in FIG. 2(A). . However, the shape of this continuous excavation hole 4 should be determined according to the shape of the structure to be constructed. For example, if the structure is a 1ε visual rectangle, Continuous drilling hole 4 as shown in
In addition, when drilling continuous drilling holes 4, two excavators are used and are launched simultaneously in opposite directions.
(J, please contribute to shortening the second half of the drilling period.

In addition, as the continuous drill hole 4 is excavated, a cross section 4
- Excavate the connecting tunnel 5. This connecting tunnel 5 is used as a temporary yard for the excavation phase of the excavation hole 4 and the negative phase for constructing the structure described later. In some cases, it is also used as a temporary shelter for excavators.Furthermore, as will be described later, temporary piles will be driven into this connecting I/channel 5, and will be used to support roof members and to provide structural support. ) It would be possible to reinforce the building during construction. A cylindrical wall 6 is constructed to surround the ground. This wall body 6 functions as a retaining wall during the construction of a structure to be described later, and can also be used as a part of the structure if necessary.

Therefore, the lower end of this wall 6 extends further than the lower end of the structure.

The construction method of this wall 6 is careless. For example, there is a method of driving a column-shaped retaining wall with a small excavator that is 200" lower than the total height of the continuous excavation hole 4, or a method of constructing a column-shaped retaining wall with a relatively small A suitable method is to use an excavation rig to excavate a hole that extends underground, and then construct an underground continuous wall by pouring concrete into this trench. .

(1v) Erection of the roof shrine As shown in Figures 4 (a) and 5, the roof (roof member) 7 is 111 -advance U', these)<Ibflug 7, completely covers one side of the wall 6 described in +iif.

By Blue 77 ('', small in Figures 5 and 6), ]
; It is a cylindrical steel pipe with the entire surface of the sea urchin in the same shape. It is cut into a predetermined length and transported into a continuous excavation hole 4, and these segments are sequentially connected in the longitudinal direction. The pipe roof 7 is constructed between the tunnel 5 and the continuous excavation hole 4, and this pipe roof 7 is connected by pushing it horizontally.
As shown in FIG. 4(A), the connecting tunnels 5 are arranged in rows in one direction (along the direction approximately perpendicular to the extending direction of the communication tunnel 5), and along this direction (as shown in FIG. 6). As shown in Fig. 4', a continuous arch is formed (4-1) and is constructed over the sea urchin.

In addition, Viblue 7 faces each other with communication tunnel 5 in between.
7.7, as shown in FIG. 6, temporary piles 9 are driven at predetermined intervals in the longitudinal direction of the connecting tunnel 5,
420 supported. In FIGS. 5 and 6, the symbol IO is a support part 21 disposed at one end of the temporary shaft 91, and the shaft 11 is interposed between the pipe roof 7 and the wall 6. ＝Tariuke (pu shrine).

In this example, pipe roofs 77, .
(Pre-geast concrete beams and the like are also suitably applicable.Furthermore, it goes without saying that the pipe roof 7, . . . may be propelled from the continuous excavation hole 4 to the communication tunnel 5.

(■) After the installation work of supporting pile driving pipe roof 7, is completed, as shown in Fig. 7, move pipe roof 7,
・While excavating the ground in the 0-'F section of the support section 1, drive the support piles I2 toward the ground, and install these support piles 12,
... supports the pipe roof 7. This support pile 1
2. A pipe loop 77 is provided for support during excavation inside the wall 6, which will be described later.

(vl) Wall excavation and structure construction Once the driving of the support piles 12, .

The order of the excavation process inside the wall 6 and the construction process of the structure.
(This is called the so-called sequential earth method, in which the excavation of the inside of the wall 6 is completed, and then the construction starts from the lower layer of the structure. ♂ Wandering” wall f
) Once the interior has been excavated to a predetermined depth, the structure is built in that part, which is called the reverse 81゛ method. Of course, I'm confused.

In addition, the temporary shafts 9 and the support piles 12 are designed to be used as pillars of the structure if necessary.

It is possible to construct an underground structure directly under the existing structure 1 using the method shown above.Here, in this example, (j
, after covering the top surface of the wall with a vibe roof 7,
By continuing to excavate the inside of this wall 6, there is no risk of the ground collapsing due to supporting the pipe roof 7 or the ground directly below the existing structure 1. , it is possible to construct an underground structure directly under the existing structure 1 without having any adverse effect on it, and it becomes possible to effectively utilize the ground directly under the existing structure I, which has not been possible in the past. However, unlike traditional tunnel construction methods, large-scale underground construction is required.
Since it is possible to construct even two objects, its scope of application is wide-ranging.

In addition, in this embodiment, since the wall 6 has a cylindrical shape, it is safe and reasonable to effectively oppose the wall 6 against the surrounding soil during excavation inside the wall 6. construction is possible.

Next, FIG. 4 (portion) is a diagram for explaining a method of constructing a structure according to the second claim. In the following description, the same reference numerals are used for the same components as in the previous embodiment, and the description thereof will be omitted.

The difference between this embodiment and the previous embodiment lies in the method of constructing the roof member. That is, as shown in FIG. 2 ([1), in this embodiment, the pipe roof 7 is propelled radially from the center of the connecting tunnel 5, that is, from the center of the continuous excavation hole 4 toward the continuous excavation hole 4. By doing so, the pipe roof 7 covers the wall 0-1.

In this case, in the vicinity of the continuous drilling hole 4, the vibration roof 7,
If there is a gap between them, it is sufficient to support them with sheet piles, fear piles, etc.

Therefore, this embodiment can also provide the same effects as those of the previous embodiment.

Furthermore, FIG. 4(C) is a blank diagram 3 for explaining a method of constructing a structure according to claim 43.

The difference between this embodiment and each embodiment described in iiij is also in the method of constructing the roof member. That is, as shown in FIG. 2(c), in this embodiment, the pipe roofs 7 are propelled radially inward from points spaced apart in the circumferential direction of the continuous excavation hole 4. The pipe roof 7 covers two sides of the wall 6''. As a result, on the 42 sides of the wall 6, a large number of vibrator roofs 7, * are disposed in an intersecting manner.

According to this embodiment, the same effects as those of the embodiments described above can be obtained.

Note that the method for constructing a structure according to the present invention is not limited to the embodiments described in Section 34 or 0-j above, and various modifications are possible. - As an example, in each of the above embodiments, the cylindrical pipe roof 7 is formed to have the same diameter throughout the roof portion +.
For example, a roof member whose cross section gradually becomes smaller as it approaches the center may be used.

Further, in the embodiment according to the first claim, along the extending direction of the communication tunnel 5, a pipe roof (roof member) 7,
Although they are arranged in a continuous arch shape, it goes without saying that they may also be arranged in a biconvex arch shape along the extending direction of the roof portion H.

"Effects of the Invention" As explained in detail in 1-1, this invention, when constructing a structure to be buried underground, constructs an excavation hole toward the underground where the structure is to be constructed, After the excavation hole reaches the position where the structure is to be constructed, an endless continuous excavation hole is constructed in a form that substantially matches the outer periphery of the structure, and further,
A wall is constructed to surround the ground downward from the continuous excavation hole, and a roof member is propelled from the connecting tunnel to cover two sides of the wall. This is a horizontal construction method for underground structures in which the structure is built while excavating the inside of the structure, and the walls are covered with roofing members.
) After that, the inside of the wall is excavated (-), so there is no risk that the roof member will support the ground directly under the existing structure and cause the ground to collapse. Therefore, it is possible to construct an underground structure directly below the existing structure without having any negative impact on it.

[Brief explanation of the drawing]

1 to 7 are diagrams for explaining a method of constructing a structure according to an embodiment of the present invention. Figure 2 is a plan view showing the continuous drilling hole, Figure 3 is a plan view showing the wall,
Figure 4 (a) is a plan view showing an example of the construction method for roof members, Figure 4 (b) is a plan view showing an example of the same song, and Figure 4 (c)
is a plan view showing an example of the same pond, FIG. 5 is a sectional view taken along the line V-v' in FIG. 4, and FIG. 6 is a sectional view taken along the line ■-■' in FIG. 4. Figure 7 is a top view showing the method for driving the 1j shaft. Existing structure, 2. Vertical shaft, 3. Drilled hole, 4. Continuous l.
IT drilling, 5 ・Connection tunnel, 0 wall, 7 Pipe roof (roof member), 9 ・Temporary pile, I2 ・Support pile.

Claims (3)

[Claims] (1) When constructing a structure that will be buried underground, a hole is drilled into the ground where the structure is to be constructed, and after the hole has reached the position where the structure is to be constructed. , An endless continuous excavation hole is constructed in a form that approximately matches the outer circumference of the structure, a connecting tunnel is constructed in a form that crosses this continuous excavation hole, and the ground is further dug downward from the continuous excavation hole. At the same time, a roof member is propelled from at least one of the communication tunnel or the continuous excavation hole toward the other, and the roof member is arranged in a row in one direction to cover the upper surface of the wall. A method of constructing an underground structure in which the structure is constructed by excavating the inside of the wall after it is covered. (2) When constructing a structure that will be buried underground, an excavation hole is constructed into the ground where the structure is to be constructed, and after the excavation hole reaches the position where the structure is to be constructed. , An endless continuous excavation hole is constructed in a form that approximately matches the outer circumference of the structure, and a communication tunnel is constructed in a form that crosses the center of this continuous excavation hole, and furthermore, a connecting tunnel is constructed in a form that crosses the center of the continuous excavation hole. After constructing a wall that surrounds the ground, and covering the upper surface of the wall by driving a roof member radially from at least one of the central part of the connecting tunnel or the continuous excavation hole toward the other. , a method of constructing an underground structure in which the structure is constructed while excavating the inside of the wall. (3) When constructing a structure that will be buried underground, an excavation hole is constructed into the ground where the structure is to be constructed, and after the excavation hole reaches the position where the structure is to be constructed. , construct an endless continuous excavation hole in a form that substantially matches the outer periphery of the structure, and further construct a wall body that surrounds the ground downward from the continuous excavation hole, and The roof members are propelled inward from a plurality of points spaced in the circumferential direction of the continuous excavation hole in a fan shape, and after covering the upper surface of the wall with these roof members, the inside of the wall is excavated and the structure is constructed. A method of constructing underground structures that involves the construction of