JP2700695B2 - 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. The present invention relates to a method for constructing a large underground architectural large space to be implemented for the purpose of creation.

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. .

In addition, as a special applied technology of the shield method, the construction method of the underground cavity described in Tokaikai 64-43699,
From the ground, construct a longitudinal resistance, launch the shield machine from the lower end of the longitudinal resistance, construct an annular or spiral shield tunnel, fill the cross section of the shield tunnel with concrete, and reinforce it. It excavates the inner ground surrounded by the underground outer peripheral wall and forms a large cavity.

Problems to be Solved by the Present Invention I) In the case of the above-mentioned excavation 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, due to the collapse of earth and sand on the way, construction can only be performed up to a depth of about 30 m underground.

II) In the case of the shield method, underground 50
It is possible to build tunnels as deep as m. However, the current shield tunnel can only construct a tunnel space with a cross-sectional diameter of at most 10 m. 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.

III) Next, it is recognized that the method for 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 feasibility 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. You have to say.

Means for Solving the Problems As a means for solving the above-mentioned problems of the prior art, a method for constructing a large building under a deep underground according to the present invention is as follows. A large-diameter shield tunnel 2 is constructed, and a large-diameter shield tunnel 2 is constructed in a horizontal direction along the outer peripheral wall of the large underground building from the vertical resistance 1.
, In which a large number of small-diameter shield tunnels 3 are constructed in parallel in a plane surrounded by a circle, and the small-diameter shield tunnels 3 are firmly connected to each other to secure rigidity; Constructing a continuous underground wall 4 in the direction to a depth required for a large underground architectural space, and placing a steel frame and a reinforcing bar in the small-diameter shield tunnel 3 and filling concrete to construct a skeleton 7, thereby completing an artificial ground. And a step of constructing an underground building frame 6 composed of a multi-layer floor 6c, beams 6b and pillars 6a in the interior surrounded by the continuous underground wall 4 under the artificial ground by a reverse hitting method to complete an architectural large space And characterized in that:

Action The vertical bearing 1 is a starting base (and an end base) of a shield machine for excavating the large-diameter shield tunnel 2. It is also used for carrying out various materials, machinery and equipment for deep underground construction, and carrying out excavated soil.

Large-diameter shield tunnel 2 is small-diameter shield tunnel 3
It will be used as a starting point for shield machines for excavation, as a terminal station, and for ground surveys and groundwater pressure surveys. In addition to being a construction base for the continuous underground wall 4, it is also used for carrying in and out materials necessary for construction and carrying out excavated soil.

The small-diameter shield tunnel 3 is a base of the artificial ground. This artificial ground supports the upper layer earth pressure and groundwater pressure loaded on the top of the large underground space.

The continuous underground wall 4 functions as a large-sized structure that supports lateral earth pressure and groundwater pressure applied to a large underground architectural space.

The underground building frame 6 is a useful underground space for human life and various industries.

Embodiment Next, an embodiment of the present invention shown in FIGS. 1 and 2 will be described.

Figure 1 shows the foot for constructing a large architectural space deep underground where the existing building 11 exists on the ground.
From the position slightly away from the existing tall materials 11, a vertical shaft 1 is excavated and constructed almost vertically until it reaches a deep underground of 50m or more below the ground, and a large-diameter shield tunnel 2 is horizontally extended from the vertical shaft 1. Has been built. The vertical bearing 1 and the large-diameter shield tunnel 2 are excavated and constructed with care so as not to impair the safety of the existing building 11. Longitudinal 1 is used as a launching base for large-diameter shield machines, or for loading and unloading machinery and equipment, and for unloading excavated soil.
It is constructed by excavating with a diameter suitable for such applications.

The large-diameter shield tunnel 2 is constructed by excavating four times along the position of the continuous underground wall 4 which is the outer peripheral wall frame of the large underground architectural space. In order to facilitate the construction of such a large-diameter shield tunnel 2, the longitudinal bearing 1 is preferably excavated and constructed at four corner positions of the continuous underground wall 4. So,
The construction of the large-diameter shield tunnel 2 consists of two adjacent
This is because 1 can be easily started and used as a point base. In some cases, it is also possible to construct the large-diameter shield tunnel 2 in a horizontal annular shape by constructing only one longitudinal bearing 1. The large-diameter shield tunnel 2 is used for ground surveys and groundwater pressure surveys, and for carrying in and out of excavated soil for various types of building work described below. It is constructed in a size (about 10 m in diameter). Further, in order to construct the underground large space with a floor surface diameter of about 100 m, the length of one side or the plane diameter of the large diameter shield tunnel 2 is constructed on a scale of about 100 m. In order to construct the above-mentioned horizontal annular large-diameter shield tunnel, a so-called R-barrel shield machine whose steel shell is curved to the same curvature as that of the ring is used as the shield machine.

In the horizontal plane surrounded by the large-diameter shield tunnels 2 constructed in this way, a large number of small-diameter shield tunnels 3 are constructed horizontally adjacent to each other in parallel. This small-diameter shield tunnel 3 is designed for safety of existing buildings 11 on the ground and ground surface,
Since it is for constructing an underground artificial ground that maintains stability, it is constructed at a position deeper than the support layer ground of the existing building 11. The small-diameter shield tunnel 3 is constructed in such a manner that the shield machine is started from the large-diameter shield tunnel 2 on one side and reaches the large-diameter shield tunnel 2 on the other side. In the small-diameter shield tunnel 3 constructed in this way, communication holes 8 are excavated between adjacent ones, and a steel frame and a reinforcing bar are arranged in each communication hole 8 and concrete is filled with each other by means such as filling. Ties are made,
The required rigidity for artificial ground has been secured.

Next, using the bottom of the large-diameter shield tunnel 2 as a construction base, a continuous underground wall 4 is constructed by digging a groove from this position vertically downward to the depth required for the underground architectural large space. It is the outer wall of the large underground architectural space.

Next, in FIG. 2, each of the small-diameter shield tunnels 3
With the bottom of the base as a construction base, a large number of vertical pillars 5 of an underground building frame to be described later are constructed from this position vertically downward to a predetermined depth. This straight pillar 5 is also for supporting the artificial ground described below.

Thereafter, a steel frame or a reinforcing bar is placed in each of the small-diameter shield tunnels 3 and concrete is filled in the entire cross-section, thereby constructing a skeleton 7, and all the small-diameter shield tunnels 3 arranged in parallel form a plate-shaped artificial tunnel. It has been completed as ground.

Thereafter, the inner ground surrounded by the artificial ground and the continuous underground wall 4 is excavated, and a multi-story underground building frame 6 is constructed by the reverse striking method using the straight columns 5. The underground construction frame 6 is constructed as a multi-story building structure composed of columns 6a and beams 6b and 6c, similarly to a normal reinforced concrete building or a steel reinforced concrete building. The completion of the underground building frame 6 provides a large underground architectural space useful for the life and industry of people on the ground.

Effects of the present invention As described in detail in conjunction with the embodiment above, according to the method of building 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 vertical shaft 1, construction can be performed sufficiently, and the underground building frame 6 of the large space can be constructed safely and accurately 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 in the basement of an urban area where the population is concentrated and the land price is higher, thereby braking the soaring underground.

[Brief description of the drawings]

1 and 2 are cross-sectional views showing the progress of construction of a large underground architectural large space according to the present invention. 1 ... longitudinal resistance, 2 ... large diameter shield tunnel 3 ... small diameter shield tunnel, 4 ... continuous underground wall 5 ... straight pillar, 6a ... pillar, 6b ... beam 6c ... floor, 6 ... Underground building frame

Claims (1)

(57) [Claims] 1. A large-diameter shield tunnel is constructed to reach a deep underground, and a large-diameter shield tunnel is constructed from the vertical defense along the outer peripheral wall of a large underground architectural space, and is surrounded by the large-diameter shield tunnel. Constructing a large number of small-diameter shield tunnels in parallel in the same plane and securing the rigidity by tightening the small-diameter shield tunnels, and a continuous underground wall directly below the large-diameter shield tunnel from the position of the large-diameter shield tunnel. Constructing a steel frame, reinforcing bars in the small-diameter shield tunnel, filling concrete and constructing a skeleton to complete an artificial ground, and the continuous underground wall under the artificial ground. Constructing an underground architectural framework consisting of multiple layers of floors, beams, and columns in the enclosed interior using a reverse striking method to complete the architectural large space; How to build.