JPH0475994B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention is a method for reinforcing existing tunnels from the outside without interfering with the use of the tunnels, as underground tunnels in urban areas become obsolete. This article relates to a box propulsion device used in protection construction methods.

《Prior art》 As underground tunnels age, the easiest way to use them as they are without destroying them and to carry out tunnel reinforcement work is as shown in Figure 7. , both sides of the existing tunnel 1 are surrounded by underground continuous walls 2, and in this state, the upper part of the existing tunnel 1 is excavated, a concrete top slab 3 is erected, and the existing tunnel 1 is surrounded.

<<Problems to be solved by the invention>> However, in order to carry out this construction in urban areas, etc., it is necessary to consider the relationship between the above-ground parts and existing buildings, the gas pipes placed underground above the existing tunnel 1, etc. Various underground structures such as water and sewage pipes and telephone cable pipes must be considered. Particularly in areas such as subway tunnel 1, which is deteriorating in downtown areas, the buried objects above are arranged in a complicated manner.
We do not know where it is located, and there are cases where existing buildings are located on the ground surface above Tunnel 1.
Therefore, the range of application of this type of construction method is actually very limited.

In addition, in this type of protection work, when the existing tunnel 1 is to be demolished and a new tunnel constructed, an alternative site must be secured in advance to detour the commercial track, so there is no room for an alternative site. The rebuilding work was also at a standstill.

Therefore, in view of the above-mentioned circumstances, the inventor of the present application proposed a new method for protecting existing tunnels by excavating a pair of guide shafts on the sides of the existing tunnel, and using a propulsion method to construct a hollow box between the guide shafts. We developed a construction method in which tunnels are closely arranged in multiple rows, and then concrete is poured inside the hollow box to form a top slab that covers the existing tunnel. Such a construction method is described in Japanese Patent Application No. 13921/1982 (see Japanese Patent Application Laid-Open No. 184693/1983) filed on the same date by the applicant of the present invention.

In this construction method, hollow boxes are successively arranged closely in multiple rows using a propulsion method, but a box propulsion device suitable for this construction method has not yet been developed.

In other words, when using conventional propulsion method equipment used for laying pipes, etc., when used in the above method, it is difficult to use the equipment because it does not have a means to quickly move to the propulsion work position corresponding to each row. There was a problem in that the top slab covering the existing tunnel could not be efficiently constructed because the installation work was time-consuming and it was difficult to transport and position the boxes to the propulsion work positions corresponding to each row.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a method for constructing protective top slabs from the outside using the propulsion method without destroying existing tunnels, so that they can be closely spaced in multiple rows. An object of the present invention is to provide a box propulsion device that can efficiently install a box.

<Means for Solving the Problems> In order to achieve the above object, the box propulsion device of the present invention includes a plurality of rails laid in multiple rows along a shaft excavated underground, and a movement on the rails. a carriage for transporting the box, which is movably disposed on the rail, is set at a predetermined position, receives the box from the carriage, and carries the box on one side of the shaft; a box starting cart that positions the box; a box starting cart that moves on a rail adjacent to the rail on which the box starting cart moves among the rails, is set adjacent to the box starting cart; The present invention is characterized by comprising a propulsion truck equipped with a pushing means for pressing the box installed on the starting truck from one side of the shaft in a direction substantially perpendicular to the shaft.

Here, the predetermined position refers to a propulsion work position corresponding to each row of boxes closely arranged in multiple rows on the rail.

Note that the substantially vertical direction in which the box is pressed is not limited to the strictly vertical direction geometrically, but may also be an approximate direction that is appropriately selected in consideration of workability, etc. in order to push the box to the side of the shaft. This is meant to include the vertical direction.

<<Operation>> According to the propulsion device having the above configuration, when a large number of boxes are closely placed between the shafts in multiple stages and in multiple rows,
While the boxes are being transported one by one on a transport cart, the boxes can be positioned using the received box starting cart, and then pushed and pushed by the jacks on the propulsion cart. These operations can be performed as a series of assembly operations, so that the boxes can be The body can be set up efficiently.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figures 1 to 5 show an embodiment of the box propulsion device according to the present invention, and Figure 6 is a completed diagram of a protection structure constructed in an existing tunnel using the same device. be.

The propulsion device of this embodiment is used with a pair of shafts 12, 12 excavated on the sides of an existing tunnel 10, as shown in FIG.

To briefly explain the method of constructing the guide shaft 12, in this embodiment, first, a starting shaft 11 (see FIG. 1) for excavating the guide shafts 12, 12 is constructed on both sides of the existing tunnel 10. ,12
Constructed and installed on the extension line of.

After installing the starting shaft 11, a pair of lower guide shafts 12a will be installed along both sides of the existing tunnel 10.
excavate.

In this embodiment, the lower guide shaft 12a is dug at approximately the same level as the bottom slab of the existing tunnel 10 by a hand digging method, a mechanical digging method using lock bolts, etc., and shoring structures 14 having a rectangular cross section are installed at appropriate intervals. At the same time, a lining is performed between the shorings 14, 14 by spraying concrete.

When a section of the existing tunnel 10 where protection is to be constructed is excavated, the vertical load of the protective wall and the horizontal load due to earth pressure are removed from the inside of the lower shaft 12a at appropriate intervals using the cast-in-place pile construction method. Supporting piles 16, 16 are constructed, a lower protective wall 18a made of reinforced concrete is constructed at the head of the pile 16, and then a filler material 20 such as aerated concrete is injected into the gap of the lower guide shaft 12a.

Next, the middle shaft 12 is placed above the lower shaft 12a.
b is excavated and a middle protection wall 18b made of reinforced concrete is constructed on top of the bottom protection wall 18a, and then the filler 20 is injected.

After that, an upper shaft 1 is installed above the middle shaft 12b.
2c is excavated, and in this state, the propulsion device according to the present invention is installed in one of the upper shafts 12c on the starting side.

The propulsion device, as shown in Figs. 1 to 3,
A rail 30 for transporting excavated earth and sand laid in the upper shaft 12c, a rail 32 for transporting the hollow box 60,
An excavated earth and sand transport cart 34 and a propulsion jack 35 as a pushing means are installed on the transport rail 30.
It has a propulsion trolley 36 on which is mounted, a transport trolley 38 for the hollow box 60 and a starting trolley 40 installed on the transportation rail 32, and each trolley 34, 36, 3
8 and 40 run along the upper guide shaft 12c, and tow cars 42 and 42 are connected to the carry-out cart 34 and the transport cart 38, respectively.

Further, the propulsion truck 36, the transport truck 38 for the hollow box 60, and the starting truck 40 are each provided with a jack for adjusting the vertical level of the mount.

Furthermore, a guide rail 46 of a hoist crane 44 is fixedly installed on the ceiling surface of the upper shaft 12c (second
(see figure), a hoist crane 44 supports a belt conveyor 48 installed between the propulsion truck 36 and the carry-out truck 34.

FIG. 3 shows details of the installation state of the propulsion jack 35. In this embodiment, four propulsion jacks 35 are used.
A reaction force slide device 50 and reaction force receiving steel material 5 are mounted on a.
2, it is supported in a substantially horizontal state.

A push ring 54 is attached to the telescopic plunger side of the propulsion jack 35.

On the other hand, a rail 56 is provided in the other upper shaft 12c.
Only the traveling trolley 58 is installed.

The hollow box 60 is constructed using the propulsion device configured as described above.
In order to arrange the tunnel between the upper shafts 12c and 12c, first, the propulsion truck 36 on which the propulsion jack 35 is mounted and the starting truck 40 are constructed in the upper part of the existing tunnel 10, and are closely arranged in multiple rows. At one end of the protective work consisting of a box, it is set at a propulsion work position corresponding to each row.

Next, the hollow box 60 is placed on the transport trolley 38 and the hollow box 60 is moved to the vicinity of the starting trolley 40.
0 to the starting truck 40, and set it so that one end is in contact with the inner wall of the upper guide shaft 12c.

In this case, a cutting edge 62 is attached to the tip of the first stage hollow box 60.

Next, the propulsion jack 35 is extended to press the rear end of the hollow box 60, and it is press-fitted into the upper shaft 12c in a substantially perpendicular direction so as to be orthogonal to the extension direction of the existing tunnel 10.

When press-fitting, if the jacking stroke of the propulsion jack 35 is short, the push ring 54 and the hollow box 6
0, an intervening ring 64 is inserted between the two.

Further, at the same time as the hollow box 60 is press-fitted, the earth and sand inside the hollow box 60 is excavated, and the excavated earth and sand is stored in the excavated earth and sand carrying cart 34 via the belt conveyor 48 and discharged to the outside.

When the first-stage hollow box 60 is press-fitted to a predetermined position, the second-stage hollow box 60, which was carried by the transport cart 38, is transferred onto the starting cart 40, and the box 60, 60 are joined together with a collar, and press-fitting and internal excavation are performed using the propulsion jack 35.

By repeating the above operations, when the tip of the first stage hollow box 60 reaches the other shaft 12c, the cutting edge 62 is attached and detached, and the carriage 58 transports it inside the upper shaft 12c. , will be used repeatedly for subsequent propulsion operations.

And the guide shaft 12c of the hollow box 60 for one row,
When the transfer between 12c and 12c is completed, the propulsion cart 36 and the starting cart 40 are moved by a distance approximately equivalent to the width of the hollow box 60, set at the propulsion work position corresponding to the next row, and the same work as above is performed. By repeating this process, the hollow boxes 60 from the second row onwards are transferred.

Here, the hollow box 60 used in this example
To explain, two types of hollow boxes 60 with rectangular cross sections are used.

One type of hollow box 60a is open at both ends and has steel plates fixed to four sides, and has a protective top plate 6.
8 is used for the first and last columns. Another type of hollow box 60b is used for each row in the middle section, and its details are shown in FIG.

The hollow box 60b has a top plate 601 and a bottom plate 60.
2 is made of the same steel plate as above, but has a U-shaped cross section with one side open, and the other side is made of a wire mesh plate 603 such as lath. In addition, the upper and lower sides of both sides are reinforced with angle plates 604, and hook-shaped hooks 605 in opposite directions are integrated into the side surfaces of each angle plate 604, and each side of each angle plate 604 is The hollow boxes 60b are joined together in a hook-shaped manner, so that the hollow boxes 60b in adjacent rows can be closely arranged in a connected state.

Note that by filling the inside of the engaging surface of the hook portion 605 with caulking material 66, each hollow box 6
The joint surfaces between the 0b's are completely sealed and a watertight state can be maintained. In addition, since the connection is weak only by engaging the hook portion 605, if the angle plates 604 of the front and rear hollow boxes 60b are connected with each other with bolts B each time one propelling operation is completed, each hollow box 60b They connect vertically and horizontally, creating a strong bond.

Furthermore, the first row or the last row of hollow boxes 60
Of course, it is also possible to connect the hollow box 60b with the hook portion 605 and the bolt B.

Now, by repeating the above steps and arranging the hollow boxes 60 throughout the protection area, adjacent rows will be joined in a vertical and horizontal matrix with horizontal communication through the wire mesh plates 603, and one flat space will be formed. It is formed in a state surrounded by each hollow box 60.

After the propulsion work is completed and the hollow box 60 portion communicates with the guide shafts 12c, 12c, each piece of equipment is removed and reinforcing bars are installed vertically and horizontally inside the space formed above the ceiling surface of the existing tunnel 10. The top slab 68 is constructed by placing reinforcement and pouring concrete.

Then, when the top plate 68 is constructed, the upper shaft 1
2c, 12c, the middle stage shaft 12b, 12b
The middle protective walls 18b, 18b constructed within the
An L-shaped upper protective wall 18c connecting both ends of the top slab 68 is constructed of reinforced concrete, and the gaps in the upper guide shafts 12c are filled with filler 20, thereby protecting both sides and the top of the existing tunnel 10. Construction of the reinforced concrete protective wall 70 and top slab 68 surrounding the building has been completed.

In addition, in this embodiment, the guide shafts 12a to 12c formed on both sides of the existing tunnel are formed in a three-tier stacked state, but considering the height of the existing tunnel 10 and workability, they may be one-tier. , there may be more.

Further, in this embodiment, the protective top plate 68 is provided only on the top of the existing tunnel 10, but a protective plate may also be provided on the bottom side of the existing tunnel 10.

Furthermore, one side opening of the hollow box 60b having a U-shaped cross section shown in the above embodiment may be made of a removable steel plate and removed after installation. is the upper shaft 12c,
In addition to being installed between 12c, it may be provided so as to extend only from one upper stage shaft 12c side.
Furthermore, it may be press-fitted not only in the horizontal direction from the upper stage guide shaft 12c but also in the diagonal direction.

Furthermore, the other wire mesh plate 603 may be a perforated plate with holes bored at appropriate locations, and the protective walls 18a to 18c may be
Place reinforcement within 2c and pour concrete.
The entire cross-sectional area can also be used as the protective wall 70.

<<Effects of the Invention>> As explained in detail above, the box propulsion device of the present invention comprises a plurality of rails laid along a shaft, a box transporting cart that moves on the rails, and a box transporting cart that moves on the rails. It consists of a box starting cart that positions the boxes, and a propulsion cart that is set adjacent to the box starting cart and is equipped with pushing means. By easily transporting and positioning the boxes and easily moving the propulsion truck to the propulsion work position, the boxes can be efficiently arranged in multiple rows between a pair of shafts, and the top plate covering the existing tunnel can be installed. Can be easily formed.

[Brief explanation of drawings]

Fig. 1 is a plan view of the device of the present invention installed in a shaft, Fig. 2 is a side view of the same, Fig. 3 is an explanatory diagram of the device in use, and Fig. 4 is a diagram of the shaft in which the device is installed. 5 is a detailed explanatory diagram of a hollow box, FIG. 6 is a completed explanatory diagram of a protective work constructed using the same device, and FIG. 7 is an explanatory diagram of a conventional protective work. 12... Guide shaft, 35... Propulsion jack, 36...
...Propulsion trolley, 38...Transportation trolley, 40...Starting trolley, 60...Hollow box.

Claims (1)

[Claims] 1. A plurality of rails laid in multiple rows along a shaft excavated underground, a carrier for carrying a box that is movably arranged on the rails, and a carriage that is movably arranged on the rails and placed in a predetermined position. a box starting cart that receives the box from the transport cart and positions the box on one side of the shaft; and a box starting cart that is adjacent to a rail on which the box starting cart moves among the rails. The box is set adjacent to the box starting cart, and the box installed on the box starting cart is moved from one side of the shaft in a direction substantially perpendicular to the shaft. 1. A box propulsion device comprising: a propulsion truck equipped with extrusion means for pushing toward the object;