JPH054490B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides water supply and sewerage systems, public drains, reception,
Concerning the open shield construction method for constructing underground structures such as underground passages for laying telephones, etc.

[Conventional technology]

The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.

The outline is shown in Fig. 5 to Fig. 7. In the figure, 1 is an open shield machine, and this is the left and right side wall plate 1.
It consists of a, 1b and a bottom plate 1c connecting them,
It is a U-shaped shield machine with openings on the front, rear, and top surfaces.

The open shield machine 1 has propulsion jacks 2 arranged vertically and facing rearward. 3 in the figure indicates a partition wall provided within the shield machine 1.

This shield machine 1 is installed in the launch shaft 7, and after partially removing the earth retaining support material 8 of the launch shaft 7, earth and sand in front of the launch shaft 7 is excavated from the front or top opening of the shield machine 1. and remove soil. Then, the propulsion jack 2 of the shield machine 1 is extended with the spacer 10 interposed therebetween, and the reaction wall 9 in the launch shaft 7 is extended.
The shield machine 1 is moved forward by taking the reaction force, and the first underground structure 4 made of a concrete box or the like is suspended from above and retracted within the tail part 1d of the shield machine 1. Set it behind jack 2.

Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using an excavating means 6 such as a shovel, an auger, or a bucket, and the earth is discharged to move the shielding machine 1 forward. First, the second underground structure 4 is suspended. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied on the rear underground structures 4, and open shielding is performed. Once Machine 1 reaches the destination shaft, it will be removed and the construction will be completed.

[Problem to be solved by the invention]

FIGS. 8 and 9 show details of the starting shaft 7, and the earth retaining shoring material 8 adopts a so-called heap structure and has a wall shape made of sheet piles, etc.
Reinforce it with braces 11 and cut tensions 12 made of H-shaped steel or the like.

By the way, the open shield machine 1 as mentioned above
The upper parts of the left and right side wall plates 1a and 1b always protrude above the ground and move forward, and the open shield aircraft 1 having the left and right side wall plates 1a and 1b of such height
In order to set the machine in the starting shaft 7 and move it forward, the upper riser 11 and shear 12 must be located above the upper ends of the left and right side wall plates 1a and 1b of the open shield machine 1. The upper part of the earth retaining shoring material 8 also protrudes from the ground by the amount α.

The open shield machine 1 lowers the components into the launch shaft 7 and assembles them internally, but the earth retaining shoring material 8
If the tip of the starting shaft protrudes, people will have to cross over to enter and exit the starting shaft 7, which is troublesome.
It is also not possible to cover the opening of the starting shaft 7 and use it as a transportation hub.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an open shield construction method in which a starting shaft can be provided without protruding above the ground.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention installs a shield machine with an internal propulsion jack and openings at the front and rear ends and top surface in a launch shaft, and removes earth and sand in front of the launch shaft from the front or top opening of the shield machine. After excavating and removing the earth, the shield machine's propulsion jack is extended to apply a reaction force to the reaction wall in the launch shaft, and the seal machine is advanced from the launch shaft, building the first underground structure made of concrete boxes, etc. It is suspended from above and set behind the propulsion jack that is retracted within the tail of the shield machine, and then excavated from the front or top of the front of the shield machine and the propulsion jack is extended to construct the first underground structure and reactor. The shield machine is moved forward by taking the reaction force from the force wall, and the new underground structure is lowered by this forward movement and placed in the front row of the existing underground structure. In the open shield construction method, in which the shield machine excavates by repeating the installation and advancement process, the shield machine consists of left and right side wall plates that are vertically divided into a lower side wall plate and an upper side wall plate. Assemble the shield machine with only the lower side wall plate to avoid tension, backfill the area around the shield machine, remove the uprights and shearing, and then add the upper side wall plate to the lower side wall plate and raise the whole thing above ground. The main idea is to raise the height so that it protrudes above the ground, and then move it forward from the launch shaft.

[Effect]

According to the present invention, the shield machine that is initially set in the starting shaft has a low height in which the left and right side wall plates composed of divided bodies are composed of the lower side wall plate, and the earth retaining shoring that forms the starting shaft is is installed so that its upper end does not protrude above the ground, and the upper part's uprights and shears can also be assembled inside this shoring material above the height of the left and right side wall plates of the shield machine.

In this way, if you bury the area around the sides of a short shield machine, the shoring material will remain stable even if the uprights and shearings are removed, and there is no risk of it collapsing due to earth pressure. .

After the lifting and cutting are removed, there will be nothing blocking the upper part, so the upper side wall plates will be added to the left and right lower side wall plates of the shield machine to make the whole structure project above the ground, and then it will be advanced from the launch shaft.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the open shield machine 1 used in the open shield construction method of the present invention will be described. As shown in FIG. Including upper side wall plate 1a ₂ , 1b ₂ and lower side wall plate 1
Construct it as a combination of the upper and lower parts of a ₁ and 1b ₁ . There are various ways to connect the upper side wall plates 1a ₂ and 1b ₂ and the lower side wall plates 1a ₁ and 1b ₁ , but one example is to provide a bracket 13 or a contact plate and fasten them with bolts.

Furthermore, the partition wall 3 can also be divided into upper and lower parts according to these side wall plates.

Other configurations are the same as the conventional example, and although not shown, a propulsion jack is provided inside as shown in FIGS. 5 to 7, and the left and right lower side wall plates 1a ₁ , 1b ₁
This is a U-shaped shield machine with a bottom plate 1c connecting the two, and openings at the front and rear end faces and the top face.

Next, the open shield construction method of the present invention using the open shield machine 1 will be explained.

Figures 1 to 3 show the steps of the construction method of the present invention, in which the starting shaft 7 adopts the same structure as the conventional one, and is made of earth retaining shoring material 8 made of sheet piles etc. into a wall shape, and H-shaped steel. The upper end of the earth retaining shoring material 8 should not protrude upward as a ground line.

Then, on the inside of this earth retaining shoring material 8, a bulge 11 and a shear 12 are provided near the upper end.

The open shield machine 1, which has the starting shaft 7 formed in this way and is assembled and set inside thereof, has only the left and right side wall plates 1a ₁ and 1b ₁ , as shown in FIG. The height shall be lower than the height of the cut bar 12.

Next, as shown in FIG. 2, earth and sand is backfilled around the required area, including the area between the outside of the lower side wall plates 1a ₁ and 1b ₁ of the open shield machine 1 and the earth retaining shoring material 8.

Then, the uprights 11 and cut-offs 12 are removed, but since the backfill 14 is present, the earth retaining shoring material 8
Even if subjected to earth pressure, this backfill 14 and shield machine 1
It maintains a stable condition with no risk of falling due to support.

After removing the trundle 11 and the cut bar 12, there will be nothing blocking the upper part, so add the upper side wall plates 1a ₂ and 1b ₂ to the left and right lower side wall plates 1a ₁ and 1b ₁ of the shield machine 1 and project the whole thing above the ground. After the height is reached, the earth retaining shoring material 8 in front of the shield machine 1 is removed and the shield machine 1 is launched from the launch shaft 7.

During this starting, earth and sand in front of the starting shaft 7 is excavated and removed from the front or top opening of the shield machine 1. Then, the propulsion jack 2 of the shield machine 1 is extended through a spacer (not shown), and a reaction force is applied to the reaction wall (not shown) in the launch shaft 7 to advance the shield machine 1. During the forward movement, the first underground structure made of a concrete box or the like is suspended from above and set behind the propulsion jack that has been retracted within the tail portion 1d of the shield machine 1.

Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using excavating means such as a shovel, an auger, a bucket, etc., and the earth is discharged, and the shielding machine 1 is moved forward and placed in front of the first underground structure. Lower the second underground structure.

Once the shield machine 1 has completely come out of the launch shaft 7, the steps of digging and setting the underground structures are repeated in the same way as in the conventional process, and the underground structures 4 are sequentially placed vertically into the ground. The tunnel is buried, backfilling 5 is performed on the underground structure 4 at the rear, and when the open shield machine 1 reaches the reaching shaft, it is removed and the construction is completed.

〔Effect of the invention〕

In the open shield construction method of the present invention as described above, the starting shaft can be installed without protruding above the ground, so the material cost is reduced, and
It also makes it easier for people to go in and out of the starting shaft, and the opening of the starting shaft can be covered and used as a transportation hub.

[Brief explanation of drawings]

Figures 1 to 3 are longitudinal sectional front views of each process showing one embodiment of the open shield construction method of the present invention, Figure 4 is a perspective view of the open shield machine used, and Figure 5 is a perspective view of the open shield machine used.
6 is a vertical side view showing a general example of the open shield construction method, FIG. 7 is a cross-sectional plan view of the same, FIG. 8 is a plan view of a conventional starting shaft, and FIG. 9 is a vertical side view of the same. 1...Open shield machine, 1a, 1b...Side wall plate, 1a ₁ , 1b ₁ ...Lower side wall plate, 1a ₂ , 1b ₂ ...
... Upper side wall plate, 1c ... Bottom plate, 1d ... Tail section, 2 ... Propulsion jack, 3 ... Partition wall, 4 ... Underground structure, 5 ... Backfill, 6 ... Excavation means, 7 ...
... Starting shaft, 8 ... Earth retaining shoring material, 9 ... Reaction wall, 10 ... Spacer, 11 ... Raise, 12
...Kirihari, 13...Bracket, 14...Backfill.

Claims (1)

[Claims] 1. A shield machine with internal propulsion jacks and openings at the front and rear ends and top is installed in the launch shaft, and earth and sand in front of the launch shaft is excavated and removed from the front or top opening of the shield machine to propel the shield machine. The shield machine is advanced from the launch shaft by extending the jack and absorbing the reaction force on the reaction wall in the launch shaft, and the first underground structure made of a concrete box is lowered from above and the tail of the shield machine is lifted. It is set behind the propulsion jack that has been retracted inside the shield machine, and is further excavated from the front or top of the front part of the shield machine, and the propulsion jack is extended to take the reaction force to the first underground structure and the reaction wall, and the shield machine The shield machine is moved forward, and a new underground structure is lowered to the front of the existing underground structure. In the open shield construction method for excavating a tunnel, the shield machine consists of left and right side wall plates divided into upper and lower parts, a lower side wall plate and an upper side wall plate, and only the lower side wall plate is used to avoid upheaving or shearing in the starting hole. After assembling the shield machine, backfilling the area around the shield machine, removing the uprights and shearing, and adding the upper side wall plate to the lower side wall plate to make the entire structure protrude above the ground, from the starting shaft. Open shield construction method characterized by forward movement.