JPH0650091A - Parallel construction method for invert excavating and lining and invert excavator - Google Patents

Abstract

PURPOSE:To enhance safety of work and workability and construct an invert at an early stage. CONSTITUTION:An invert excavator 1 is in the form of a ship which fits the shape of an invert that its bottom face forms, and has a drilling edge 2 formed at an end portion thereof. The invert excavator 1 has front and rear main bodies 1a, 1b formed independently of each other and connected together by a plurality of propulsion jack devices 4 whose axis is horizontal. An auxiliary propulsion jack device 5 is projected rearwards from the rear end of the rear main body 1b, the rear end portion of the jack device 5 being capable of abutting to the front end face of the invert constructed. Crane equipment 8 is installed on the right front face of the rear of the invert excavator 1 and PC panels 9 can be hung and laid by the crane 8. The PC panel 9 is preformed to fit the shape of the invert.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tunnel construction,
In particular, it relates to an invert construction method for constructing excavation and lining for invert construction.

[0002]

2. Description of the Related Art Tunnel construction involves excavating a required space underground and lining a tunnel to withstand external pressure for a long period of time. In the construction, when it is necessary to carry out the lining of the invert at an early stage, in the conventional mini bench construction method, for example, as shown in FIG. 4, the face 30 is installed in the gantry jumbo 31. The rock drilling machine at the tip of the boom 32 pierces the bedrock at the tip 33 of the tunnel, fills the hole with explosives, and explodes the tunnel.
Excavation is carried out, and while supporting the earth pressure and the like of the excavated portion by steel arch support, etc., the arch portion and the side wall portion are sequentially covered with concrete.

In parallel with the excavation and lining work on the face, invert construction is carried out behind the face. The invert construction is performed by excavating the bottom of the tunnel with an excavator such as a backhoe 34 or by hand.
While carrying the earth and sand by the excavation by the conveyor 35, a form 36 is installed behind the excavated ground, and on-site concrete is placed in the form to construct an invert 37.

Further, a large movable invert bridge 37 is arranged so as to connect the front and rear of the invert construction site, and rock fragments and earth and sand (hereinafter referred to as "slider") cut by piercing and blasting with the face 30 are cut. In order to carry out the) to the outside of the mine, when loading the shear into a transportation vehicle such as a truck and transporting it to the outside of the mine, or when carrying in materials to the face 30, the transportation vehicle, etc. It travels back and forth between the face 30 and the outside of the mine via the movable invert bridge 37 so as to avoid the construction site.

[0005]

However, invert construction as described above is performed when the geology is poor, such as soft rock, and in that case, after excavation and lining with the face face 30, the closure is performed early. It is necessary to be able to withstand earth pressure, etc., but if a large invert bridge 37 is placed to avoid the invert construction site as described above,
Since it is necessary to arrange the incline of the invert bridge 37 with a slope within a predetermined angle, 200
Since there is no choice but to carry out concrete pouring of the invert construction after about 300 m, there is a problem that the above-mentioned closing is delayed.

Further, the work floor in tunnel excavation is preferably flat and sturdy in consideration of safety and work efficiency. However, as described above, it is necessary to invert the work when carrying materials such as sliding out and supporting work. Traffic on the bridge
There is also a problem that it becomes a factor that deteriorates the safety and work efficiency of tunnel excavation work. The present invention has been made in view of the above problems, and an object thereof is to improve work safety and workability, and to construct an invert at an early stage without being affected by spring water and geology.

[0007]

In order to achieve the above object, the invert excavation lining parallel construction method of the present invention provides an invert excavator having a bottom surface having the same shape as that of the invert and slidable along the bottom of the tunnel. It is characterized by advancing along the bottom of the tunnel for excavation and carrying out the invert lining work behind the invert excavator.

The invert machine used in the above construction method has, for example, an excavator main body whose bottom surface has the same shape as that of the invert and whose upper surface forms a working floor, and a propulsion means for advancing the excavator main body. It is characterized by having.

[0009]

[Function] When the invert excavator slides along the bottom surface of the tunnel for constructing the invert, the tip portion of the invert excavator scrapes the invert forming portion, and is identical to the bottom surface of the excavator having the same shape as the invert. Shape the bottom of the tunnel into the shape of. Then, an invert is constructed by sequentially laying a PC plate or pouring concrete on the bottom surface of the shaped tunnel.

At this time, an invert machine capable of providing a drainage function protects the ground at the bottom of the shaped tunnel,
In addition to playing the role of temporary support until the invert construction,
Since the bottom surface of the invert excavator and the invert forming part have the same shape, the invert excavator is stable, and the upper surface of the invert excavator can be a solid work floor that connects the face and the outside of the mine.

Further, by using the PC version (in-situ concrete is also possible) for the construction work of the invert, on-site work such as complicated formwork construction can be reduced, and the construction of the invert can be done at an early stage. The constructed invert also plays a role on a concrete road connecting the face with the face. As described above, since the work surface of the invert excavator and the constructed invert upper surface form a substantially flat and robust work floor, safety and workability in material loading and unloading are improved. At the same time, since it is not necessary to go through the large invert bridge, the invert construction site can be approached to the face.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the invert excavator 1 of the present embodiment has a hull shape that follows the shape of the invert formed by the bottom surface, and the tip surface is an inclined surface that projects forward at an acute angle. To form the digging blade 2. Folding type conveyor 3 from the center of the excavation part at the tip to the rear
Is extended so that the skid scraped by the digging blade 2 can be conveyed backward.

The invert excavator 1 is formed as a front and rear body, and a front portion 1a and a rear portion 1b of the main body are connected by a plurality of propulsion jack devices 4 each having a horizontal axis as propulsion means. Has been done. Further, the auxiliary propulsion jack device 5 is provided so as to project rearward from the rear end of the main body rear portion 1b, and the rear end portion of the jack device 5 can contact the front end surface of the constructed invert.

Further, a slender notch portion is formed in the rear part of the invert excavator 1 toward the front, and the notch portion serves as an opening 6 for excavating the central sewer pipe 7 formed in the central portion of the invert. . In addition, a crane facility 8 is installed on the right side of the rear part of the invert excavator 1, and the PC 8 can be hung and laid by the crane 8.

The PC plate 9 is formed in advance so as to conform to the shape of the invert to be constructed, and the lock bolt 10 is projectingly provided on the lower surface. In the tunnel excavation work using the above-described invert machine 1 and the PC version 9, the tip of the tunnel is sequentially excavated at the face by a mechanical excavation method using a free-section excavator or a conventional blasting method. Steel arch support will be used to support earth pressure, and the arch and side walls will be covered with concrete.

Then, invert construction is carried out behind the face and in parallel with excavation and lining work on the face. For the invert construction, an excavator such as a backhoe (not shown) or a manual excavator is used to excavate the bottom of the tunnel, and the invert excavator 1 is installed on the excavated surface.
The expansion jack device 4 of the invert excavator 1 is expanded and contracted to move forward like a worm. That is, by extending the propulsion jack device 4, the main body front portion 1a is moved forward relative to the main body rear portion 1b, and further, by contracting the propulsion jack device 4, the main body rear portion 1b is pulled to the main body front portion 1a. At this time, the anchor force necessary for propulsion is obtained by using the load of the free-section excavator or the like on the fixed portions 1a and 1b.

As described above, when the invert excavator 1 moves forward, the front excavation blade 2 scrapes the bottom of the tunnel to level the ground and folds the earth and sand resulting from the excavation.
It is sent to the rear through the conveyor 3 and placed on the rear end side of the conveyor 3 to be loaded on a shearing vehicle (not shown). Moreover, the PC plate 9 is lifted by the crane equipment 8 by the amount of the forward movement of the invert excavator 1, and the PC is attached to the bottom surface of the tunnel where the ground is leveled.
The rock bolts 10 protruding from the plate 9 are sequentially laid so as to be inserted into the ground to construct an invert.

In parallel with the work of laying the PC plate 9, the central portion of the bottom surface of the tunnel is excavated through the opening 6 at the rear of the invert excavator 1 and the sewer pipe 7 is sequentially buried. In this way, the bottom of the tunnel for constructing the invert is leveled, and the leveled ground is lined to construct the invert. At this time, since the ground is supported by the bottom surface of the invert excavator 1 until the ground is laid, the invert excavator 1 serves as a temporary support for constructing the invert and at the same time Since nothing is installed on the upper left side of the excavator 1, it can be used as a work floor for trucks and the like to come and go.

For this reason, in order to carry out the shear generated in the face to the outside of the mine, when the shear is loaded on a carrier such as a truck and transported to the outside of the mine, the carrier is the invert excavator in this embodiment. It is possible to go back and forth between the working face and the surface of the tunnel through a solid concrete 11 made of invert which has already been formed by laying the PC plate 9 on top of the above.

At this time, since it takes several days to cure the newly laid PC plate 9, as shown in FIG. 2, the slide bridge 12 is extended from the rear part of the invert excavator 1 toward the rear, It is preferable that the transport vehicle is not directly placed on the PC plate 9 during the curing period. As described above, in the present embodiment, since a large movable invert bridge is not required, the distance between the face and the invert construction site can be shortened, and thus the closing in the tunnel can be performed earlier than in the conventional case. It becomes feasible.

Further, when the PC plate 9 is used for the invert construction, the construction for the invert lining at the site is simplified. In the above embodiment, the crane equipment 8 for laying the PC plate 9 is installed at the rear part of the invert machine 1; however, the device for laying the PC plate 9 is not necessarily on the invert machine 1. Alternatively, it may be placed on the already constructed invert portion. The point is that the PC plate 9 can be laid behind the invert machine 1.

[0022]

As described above, in the invert excavation lining parallel construction method of the present invention, since the distance between the face and the invert construction site can be shortened, there is an effect that the closure can be performed earlier than before. . Also, if a drainage system is installed on the bottom of the invert machine, the effect of protecting the bedrock will be further enhanced. At this time, the ground at the bottom of the excavated tunnel is supported and protected by the bottom of the invert excavator 1 until the invert lining is covered, and the upper part of the invert excavator connects the face to the outside of the tunnel. It is possible to form a different work floor, and there is an effect that safety and workability are improved in the work of transporting shears and materials.

Further, since the inversion is constructed using the PC version, the construction of the inversion lining on the site is simplified.

[Brief description of drawings]

FIG. 1 is a plan view showing an invert excavator and an invert construction site according to an embodiment of the present invention.

FIG. 2 is a side view showing an invert machine and an invert construction site according to an embodiment of the present invention.

FIG. 3 is a schematic perspective view showing an invert machine of the embodiment according to the present invention.

FIG. 4 is a schematic side view showing a conventional tunnel construction.

[Explanation of symbols]

 1 Invert machine 4 Propulsion jack device 9 PC version

Claims (2)

[Claims] 1. An invert excavator having a bottom surface having the same shape as that of the invert and slidable along the bottom surface of the tunnel is advanced along the bottom surface of the tunnel to excavate, and the invert cover is provided behind the invert excavator. Invert excavation lining parallel construction method characterized by carrying out construction work. 2. An invert excavator, which comprises a excavator main body whose bottom surface has the same shape as that of the invert and whose upper surface serves as a working floor, and a propulsion means for advancing the excavator main body.