JP2700694B2 - How to build a large architectural space underground - Google Patents

Description

The present invention relates to a large-scale architectural space with a floor diameter as large as 100m, which is mainly located under a so-called 50m deep under an existing building in a large city. It relates to a method of constructing a large underground architectural space to be implemented for the purpose of making.

2. Description of the Related Art Conventionally, as a technique for constructing an underground space, a digging method, a shield method, and the like are generally implemented.

In the excavation method, first, a portion corresponding to the outer peripheral wall of the underground space is excavated from the ground, a reinforcing bar is inserted into the excavated portion, concrete is cast, and an underground wall is constructed, and then the ground surrounded by the underground wall is constructed. Excavation method.

In the shield method, a strong cylindrical steel shell called a shield machine is pushed into the ground, the ground in front of the part protected by this steel shell is excavated, and the rear part is almost the same as a cylindrical steel shell. This is a method of assembling a ring-shaped lining (segment) to protect the already excavated tunnel space, and constructing a tunnel by repeating the procedure of moving the shield machine forward by taking a reaction force to this lining. .

As a special application technology of the shield method,
The method of constructing an underground cavity described in Japanese Patent Publication No. 64-43699 discloses a method of constructing a shaft from the ground, starting a shield machine from the lower end of the shaft, and constructing an annular or spiral shield tunnel. The inside of the tunnel section is filled with concrete and reinforced, and the inside ground surrounded by the underground outer wall frame constructed in this way is excavated to form a large cavity.

Problems to be Solved by the Present Invention In the case of the above-described open-cutting method, an underground space cannot be constructed under an existing building on the ground. In addition, there is a technical limit in construction accuracy for excavating the underground wall from the ground, and it is difficult to maintain accurate verticality when the depth of the underground is deep. In addition, because of the collapse of earth and sand on the way, it can be constructed only up to a depth of about 30m underground.

In the case of the shield method, it is possible to construct a tunnel that extends deeper than 50m below existing buildings. However, the current shield tunnel is at most 10 meters in diameter
Only the tunnel space can be built. Therefore, it cannot be used for the purpose of constructing a large underground space with a floor diameter of about 100 m, and these points are issues to be solved.

Next, it is recognized that the method of constructing an underground cavity described in the above-mentioned Japanese Patent Application Laid-Open No. 64-43699 is a groundbreaking technical idea that foresees the realization of a large underground large space. However, the procedure for building the shield tunnel and completing the shield tunnel in the outer wall frame and its reliability, and the specifics of how to use the formed underground large cavity as an effective space for humans are poorly specific. I must say. For example, simply filling concrete in the cross section of an annular or spiral shield tunnel is not safe because it is difficult to expect sufficient strength and rigidity against earth pressure and groundwater pressure. In addition, creating a hollow space under the ground is not the ultimate purpose, but how to create the hollow space in a reasonably useful architectural space should be the ultimate purpose, so these issues still need to be solved. I must say.

Means for Solving the Problems As a means for solving the problems of the prior art, a method for constructing an architectural large space in a deep underground according to the present invention is described as follows. Constructing a vertical shaft 1 having a depth sufficient to reach a space, constructing an advanced shaft 2 in a horizontal direction from a large depth position in the middle of the vertical shaft 1, and starting a shield machine from a middle position in the vertical shaft 1 Then, a spiral shield tunnel 3 circumscribing the advanced shaft 2 is sequentially constructed in a horizontal direction, and the shield tunnels 3, 3 adjacent to each other in front and rear are tightly connected to each other, and a reinforcing material 10 is provided in the cross section of the shield tunnel 3. Filling and outer wall frame 4
Building a large cavity 6 by excavating the ground 5 at the inner portion surrounded by the outer peripheral wall skeleton 4, laying a traveling rail 7 on the floor of the large cavity 6, At a position corresponding to the shaft 1 on the traveling rail 7, a traveling unit 8 of a multi-story internal building frame 9 composed of columns 8 a, beams 8 b, and floor 8 c is constructed for one unit, and this one unit is trapping. Moving the rail forward a predetermined stroke on the rail 7 and repeating the construction of the traveling unit 8 and the traveling thereof thereafter.

Operation The shaft 1 and the advanced shaft 2 are the starting points for the shield machine. It is also used for loading and unloading materials, machinery and equipment for deep underground construction, and for removing excavated soil. The advanced shaft 2 is also used for ground surveys and groundwater pressure surveys, and is also used for carrying in and out materials necessary for construction of the outer peripheral wall frame 4.

By drilling with a large-diameter shield machine,
A spiral shield tunnel 3 having a spiral diameter of about 100 m is constructed.

The shield tunnels 3 that overlap each other are tied to each other, and reinforcing materials such as steel frames and rebars are placed in the shield tunnels 3 and filled with concrete 10 to reinforce them. Outer wall frame 4
Is constructed. The outer wall skeleton 4 functions as a super-large structure that supports earth pressure and groundwater pressure to be applied to the inner building skeleton 9.

Therefore, a large cavity 6 is formed by excavating the ground 5 inside the outer peripheral wall frame 4.

In the inner large cavity 6 protected by the outer peripheral wall frame 4, building the traveling units 8 of the internal building frame 9 one by one is performed under almost the same conditions as the work on the ground. A large-scale internal building frame 9 is completed by traveling each unit and joining them together, so that safe and highly reliable construction can be efficiently performed even in construction in an underground cavity.

Embodiment Next, the illustrated embodiment of the present invention will be described.

FIG. 1 shows that the shaft 1 is almost vertical from a position slightly away from the existing building 11 so that it can be used as a foothold for constructing an architectural large space deep underground where the existing building 11 exists on the ground. 2 shows a staircase constructed by excavating to a required depth, and further excavating and constructing an advanced shaft 2 in a horizontal direction from a large depth position in the vertical shaft 1. The shaft 1 and the advanced shaft 2 are excavated and constructed with care so as not to impair the safety of the existing building 11. The shaft 1 and the advanced shaft 2 are used as a starting base for shield machines, or used to carry in and out machines and equipment, and carry out excavated soil. Excavated and built. The shaft 1 is excavated and constructed to a depth reaching the deepest portion of the outer peripheral wall frame 4 of the large underground building space (see FIG. 2 and subsequent figures). The advanced shaft 2 is excavated and constructed sufficiently longer than the depth of the same outer peripheral wall skeleton 4 (see FIG. 2 et seq.).

FIG. 2 shows the position of the shaft 1 in the middle, that is, the advanced shaft 2.
This shows a stage in which the shield machine is started to the left in the horizontal direction at a so-called deep position at a depth of 50 m or less underground, and the spiral shield tunnel 3 is constructed. The shield tunnel 3 is constructed on a scale having a cross section diameter of about several tens of meters and a spiral diameter of about 100 m. For this reason, a so-called R-barreled shield machine in which the steel shell of the shield machine is curved to the same curvature as that of the spiral is used, and the shield tunnel 3 is being constructed sequentially to the left in the figure. However, the shield tunnel 3 is not limited to a circular spiral, but may be constructed as a square spiral or the like.

The shield tunnel 3 has a contact point with the advanced shaft 2 every round, and the excavated soil is carried out a short distance toward the advanced shaft 2 by using the passage 12 provided at the contact point. It is. The spiral shield tunnel 3 is constructed in a state where the front and rear shields overlap each other. The shield tunnels which overlap each other are digged, for example, through holes 13 penetrating each other at a constant pitch in the longitudinal direction of the tunnel.
A reinforcing bar or steel frame as a reinforcing material is put in the block 13 and concrete is filled, for example, to firmly tie them together to secure integration and rigidity.

FIG. 3 shows a stage in which a steel frame or a reinforcing bar as a reinforcing material is disposed inside the shield tunnel 3 and concrete 10 is filled in all sections to complete the construction of the outer peripheral wall frame 4 underground. . As a result, a huge outer peripheral wall body 4 having a cross-sectional thickness of several tens of meters is formed.

FIG. 4 shows a stage in which a large cavity 6 is being formed by excavating the inner ground 5 surrounded by the underground outer peripheral wall frame 4 completed as described above.

FIG. 5 shows that a traveling rail 7 is laid on the floor of the large cavity 6 formed as described above, and a portion of the traveling rail 7 particularly corresponding to the shaft 1 (that is, a right end in the figure). Internal building frame 9 at the site near the shaft wall)
Fig. 6 shows a stage in which the construction of a single traveling unit 8 as a component of the above is started, and FIG. This shows a stage in which traveling (moving) is performed to the left.

The internal building frame 9 includes columns 8a, beams 8b and floors 8c as in a normal reinforced concrete or steel reinforced concrete building.
It is constructed as a multi-story building structure consisting of:
The traveling unit 8 has a structure in which the internal building frame 9 of the above structure is vertically divided into several parts. The size of one unit is set to a shape and weight capable of traveling a predetermined stroke by a driving means such as a hydraulic jack 14 which takes a reaction force on the shaft wall of the shaft 1.

FIG. 7 shows a stage in which the construction of the traveling unit 8 for each unit and the traveling are repeated several times to construct the internal building frame 9 to a certain size. The completion of the internal building frame 9 in the large cavity 6 in this way provides a large underground architectural space useful for people on the ground.

Effects of the present invention As described in detail in conjunction with the embodiment above, according to the method of constructing a large deep underground building large space according to the present invention,
The presence of the existing building 11 on the ground does not cause any obstacles, and the floor diameter is around 100 m in the deep underground below the supporting ground of the existing building 11 without any adverse effect on the existing building 11 or the ground surface Architectural large space can be constructed. If there is enough construction space on the ground to excavate the shaft 1, construction can be performed sufficiently, and the internal building frame 9 of the large underground space can be safely and accurately constructed at any depth. Moreover, it can be easily implemented as an extension of the current construction technology.

Therefore, according to the present invention, it is possible to expect an effect of creating a large living space underground in an urban area where the population is concentrated and the land price is higher, thereby braking the rise in land price.

[Brief description of the drawings]

FIGS. 1 to 7 are sectional views showing the essential steps of the method for constructing a large underground architectural space according to the present invention. 1 Vertical shaft 2 Advanced shaft 3 Shield tunnel 10 Reinforcement 8a Column 8b Beam 8c Floor 9 Internal building frame 5 Ground 6 … Large cavity 7 …… Traveling rail 8 …… Traveling unit

Claims (1)

(57) [Claims] A step of constructing a vertical shaft having a depth sufficiently reaching a large underground architectural space, and constructing an advanced shaft in a horizontal direction from a large depth position in the middle of the vertical shaft; Starting the shield machine from and constructing a spiral shield tunnel circumscribing the advanced shaft sequentially in the horizontal direction and tightening the front and rear shield tunnels with each other, filling the shield tunnel with a reinforcing material and filling the outer peripheral wall frame Constructing, and excavating the ground of the inner portion surrounded by the outer peripheral wall skeleton to form a large cavity, laying a traveling rail on the floor of the large cavity, on the traveling rail At the site corresponding to the shaft, a unit for traveling of the internal building frame of the multi-story building consisting of columns, beams and floors is constructed for only one unit, and this one unit moves forward on the rail for trapping. It is a constant stroke movement, a method of constructing a building large space deep underground, characterized in that it consists of the steps of repeating the construction of traveling for units below its traveling.