KR100548810B1 - Expansion tunnel and existing construction method using existing tunnel constructed under rocky condition - Google Patents

Abstract

The present invention relates to an extension technology of a conventional tunnel constructed in rocky ground conditions, and a construction method thereof, by installing a housing at regular intervals along the lining of an existing tunnel, and installing an auger equipped with an auger excavator in the housing. After drilling a drill of unit size in a step size and reinforcing the reinforcing bars in the excavation hole, concrete is laid to form an expansion tunnel excavation wall, and then excavated and removed the rock between the existing tunnel lining and the expansion tunnel excavation wall. It is an extension tunnel.

The construction method includes installing a housing having a predetermined length at a predetermined distance from a lining of an existing tunnel and gradually entering the hydraulic jack so that half of the entire housing length is excavated at a rock above the lining of the existing tunnel;

Installing an excavation equipment equipped with an auger excavator on the upper part of the lining to protrude to the existing tunnel entrance and installing an expansion tunnel excavation wall wall by drilling a unit excavation hole stepwise;

Assembling and installing reinforcing bars in the unit excavation hole and constructing concrete for spreading the expansion tunnel excavation cavity wall to form an expansion tunnel excavation cavity wall;

Digging and removing the rock between the existing tunnel lining and the expansion tunnel drilling cavity wall;

Moving the housing for the next excavation and repeating the steps by using the excavation equipment installed in the housing to form an expansion tunnel excavation hole wall to finish construction of the expansion tunnel; And

In order to communicate the traffic of the completed expansion tunnel, the road surface should be arranged and paved, and the facilities such as lighting inside the tunnel will be used so that the tunnel can be used.

Description

      {Expanding tunnel and constructing method of the existing tunnel which was constructed in rock masses}

       1 is a view showing a tunnel extension construction method of the present invention.

       Figure 2 is a cross-sectional view showing a cross section of the tunnel extension construction method of the present invention.

Figure 3 is a view showing a housing installed on top of the existing tunnel for tunnel expansion of the present invention.

4 is a view showing the installation of the housing unit in the existing tunnel of the present invention and constructing the unit excavation step by step for the expansion of the tunnel.

5 is a view showing the construction of the expansion tunnel excavation cavity by installing the excavation equipment on the housing installed in the existing tunnel of the present invention.

Figure 6 shows the completion of the tunnel expansion of the present invention.

Figure 7 is a view showing a step of drilling a unit excavation step by step for the tunnel expansion of the present invention.

8 is a view showing an auger excavator mounted on the excavation equipment used to construct the unit excavation hole of the present invention.

9 is a view showing a state in which the construction of the unit excavation hole using the excavation equipment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 .... Existing Tunnel 20 ... Expansion Tunnel

30 ... Expansion Tunnel Excavation Wall 40 ... Excavation Equipment

50 ... concrete pump car 60 ... housing

61 ... Support

70 ... Auger Excavator 71 ... Auger

72 ... Casing

80 .... Unit Excavator 81 ... Drilling order (1,2,3 ...)

82 ... overlap

       The present invention relates to an expansion tunnel using an existing tunnel constructed in the ground conditions consisting of rock and its construction method, the housing is installed at regular intervals along the lining of the existing tunnel and the excavation equipment equipped with an auger excavator is installed in the housing. After drilling a unit drill hole of a certain size step by step and reinforcing the reinforcing bars in the excavation hole, after the concrete is laid to form the expansion tunnel excavation wall wall excavation and removal of the rock between the existing tunnel lining and expansion tunnel excavation wall Extension tunnel to install.

The construction method is to install a housing of a certain length at a predetermined distance from the lining of the existing tunnel, and gradually enters the hydraulic jack so that half of the entire housing length is excavated in the soil of the upper part of the lining of the existing tunnel and the whole housing is installed. Half of the length of the housing is to install the excavation equipment equipped with auger excavator on the support of the upper lining so as to protrude into the existing tunnel entrance, and to install the expansion tunnel excavation wall wall by drilling the unit excavation step by step and in the unit excavation hole Assembling and installing reinforcing bars and laying concrete for the expansion tunnel drilling masonry to form the expansion tunnel drilling cavities, and excavating and removing the rock between the existing tunnel lining and the expansion tunnel drilling cavities. And excavation installed in the housing by moving the housing for the next excavation Repeating the above steps using rain to terminate the construction of the expansion tunnel by repeating the construction of the expansion tunnel, and paving the road surface to communicate the traffic of the completed expansion tunnel, and installing the lighting and other facilities in the tunnel. It is to expand the tunnel by constructing it in stages.

       The purpose of the present invention is to increase the traffic capacity of the existing tunnel due to the increase in traffic volume, etc., and is proposed to expand the tunnel in addition to the existing tunnel, and in particular, the soil that forms the existing tunnel is applicable to a tunnel composed of rock such as weathered rock. Can be.

       Install a certain length of housing along the upper lining of the existing tunnel made of rock and install some excavation equipment equipped with an auger excavator in some of the housings. It is a method for the construction of expansion tunnels in which the rock between the existing tunnel lining and the expansion tunnel drilling cavities is excavated and installed step by step while forming the expansion tunnel drilling cavities by placing concrete after laying reinforcing bars.

The construction method of the expansion tunnel installed in this way is installed by using an excavator suitable for the ground conditions composed of rock, so the work speed is fast, and by using the existing tunnel, it expands the tunnel while communicating traffic without blocking traffic of the existing tunnel. There is no need to take any countermeasures for traffic communication.Because the left and right parts of the existing tunnel are used as expansion tunnels, the cost and purchase period for land purchases can be absolutely reduced. To provide a construction method that can solve the problem of excessive land purchase period, purchase cost, and construction cost to expand the tunnel.

Conventionally, when it is necessary to extend the tunnel, the tunnel has been installed by adding a separate tunnel next to the existing tunnel. This method requires a very long period and cost for land purchase of the site required for the expansion tunnel. The problem of damaging nature has always existed because it requires a lot of construction costs and construction periods and a separate tunnel to be installed.

 In addition, when the tunnel is separately installed for ground conditions consisting of weathered rock and soft rock, which are not general earth and sand, due to the blasting cost and blasting noise generated when the tunnel is constructed using equipment such as blasting or excavator There is a problem that adversely affects the surrounding environment due to noise generated by the noise pollution and large excavation equipment, and dust such as sludge generated during excavation.

       The present invention has been proposed in view of the above matters, and a predetermined length of housings are installed along the upper linings of existing tunnels, and drilling equipment equipped with auger excavators in the housings is drilled step by step in a predetermined size. Method of construction of expansion tunnel installed by laying excavation and removal of rock between existing tunnel lining and expansion tunnel drilling hole wall by forming concrete tunneling hole after placing rebar As a result, the work efficiency is improved by applying the excavator suitable for the ground conditions of the existing tunnel made of rock, and it is possible to expand the tunnel by using the existing tunnel and do not interfere with the traffic communication of the existing tunnel. No countermeasures for communication are needed, and the land purchase costs are due to using existing tunnels. It is easy to reduce the cost, thereby providing a construction method that can bring a significant reduction in construction costs and construction period.

       In order to achieve the above object, the present invention relates to an expansion tunnel using an existing tunnel constructed in the ground conditions consisting of rock and its construction method, the housing 60 of a predetermined length along the upper lining of the existing tunnel (10) And install the excavation equipment 40 equipped with the auger excavator 70 in the housing, and drill the unit drilling holes 80 of a predetermined size step by step to place the reinforcing bars and then pour concrete to expand the tunnel tunnel Forming 30 is an expansion tunnel 20 installed in stages by excavating and removing the rock between the existing tunnel 10 lining and expansion tunnel excavation cavity wall 30.

Its construction method is as follows.

The housing 60 of a certain length is installed with a predetermined distance from the existing tunnel 10 lining and gradually enters the hydraulic jack so that half of the length of the entire housing 60 is excavated in the soil of the upper part of the lining of the existing tunnel 10. Step (60) and half of the length of the entire housing (60) is excavating equipment 40 equipped with an auger excavator (70) on the support (61) of the upper lining so as to protrude to the entrance of the existing tunnel (10) Install and install the expansion tunnel excavation hole wall 30 by drilling the unit excavation hole 80 step by step and assembling and installing reinforcing bars in the unit excavation hole 80 and curing the expansion tunnel Forming an empty wall body 30, excavating and removing a rock between the existing tunnel 10 lining and the expansion tunnel drilling cavity wall 30, and moving the housing 60 for the next drilling; Oysters installed at 60 Repeating the above steps using the equipment 40 to form the expansion tunnel excavation hole wall 30 to terminate the construction of the expansion tunnel 20 and the road surface to communicate the traffic of the completed expansion tunnel 20 It is characterized by arranging and packaging the facilities and installing facilities such as lighting in the tunnel.
Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

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       1 is a view showing a tunnel extension construction method of the present invention, a predetermined length of the housing 60 is installed on the upper lining of the existing tunnel 10, and gradually enters the hydraulic jack lining the housing 60 of the full length Excavate in the upper soil, and the other half is projected to the entrance of the existing tunnel (10) and then install the excavation equipment 40 equipped with the auger excavator 70 on the support 61 to cross-section the expansion tunnel 20 In order to form a perforated unit excavation hole 80 step by step using the auger excavator 70, assembling and installing reinforcing bars in the unit excavation hole 80 to cure concrete in order to sequentially expand the tunnel excavation wall ( After forming 30), the excavation equipment installed in the housing 60 by moving the housing 60 for the next drilling after excavating and removing the rock between the existing tunnel 10 lining and the expansion tunnel excavation cavity wall 30 40 teeth Perforated unit excavation hole (80) to install the reinforcing bars and pour concrete to form the expansion tunnel excavation hole wall 30 and the rock between the existing tunnel (10) lining and expansion tunnel excavation hole wall (30) It is a figure which shows collectively the excavation work sequentially and repeatedly.

       The auger excavator 70 installed in the casing 72 and the concrete pump vehicle 50 for concrete pumping are connected to the excavating equipment 40 to the auger excavator 70 and the casing 72 having a length of about 12 m. The circular unit excavation hole 80 to be excavated forms a unit excavation hole 80 having a length of about 12 m. The reinforcing bar is installed in the circular unit excavation hole 80 and the concrete pump vehicle 50 is formed. Concrete is poured.

        When the auger excavator 70 sequentially drills the unit excavation hole 80 along the expansion tunnel plan cross section, an expansion tunnel excavation hole wall 30 is installed, and the drilling sequence 81 thereof is described with reference to FIG. 7. As a method of forming a drilling hole in the skipped portion, and then drilled by skipping the excavation hole as described above, by repeatedly forming along the plan cross section of the expansion tunnel to install the expansion tunnel excavation hole wall (30). Referring to the sign shown in Figure 7, the drilling sequence 81 drilled the first drilling hole, and then skipped the drilling sequence 81 drilled the second drilling hole and then the drilling sequence 81 first drilled hole and 2 Drilling procedure (81) between the three drilling holes forming the three drilling holes is to repeatedly install the drilling along the planar tunnel cross section.

        In order to install the expansion tunnel excavation hole wall 30, the unit excavation hole 80 is drilled step by step, and as shown in FIG. After drilling the work step by step along the plan section of the expansion tunnel 20 is to repeat the work to proceed to the next step.

        In addition, the housing 60 is installed on the upper lining of the existing tunnel 10 is manufactured by installing a steel plate in the lining shape of the existing tunnel 10 in order to be excavated into the earth and sand of the upper portion of the existing tunnel 10 by a hydraulic jack, In the center portion is installed a support 61 so that the drilling equipment 40 can be mounted by installing a steel, such as H beam. The total length of the housing 60 is about 40m, so that the housing 60 of about 20m protrudes from the entrance side of the existing tunnel 10 so as not to disturb the vehicle passing through the existing tunnel 10.

       When the expansion tunnel excavation hole wall 30 is completed, the unit excavation hole 80 is formed along the planar cross section of the expansion tunnel 20 stepwise in a funnel shape, so that the expansion tunnel excavation hole wall 30 has a bend. In addition, the precast panel may be attached to the expansion tunnel excavation wall 30 in order to have a beautiful appearance because it adversely affects traffic safety. In this case, the concrete is filled between the expansion tunnel excavation wall 30 and the precast panel. To enhance adhesion.

       2 is a cross-sectional view showing a cross-section of the tunnel extension construction method of the present invention showing that the drilling equipment 40 equipped with the auger excavator 70 is installed in the housing 60 and drilled along the planar cross section of the expansion tunnel 20. will be.

3 is a view showing the housing installed in the existing tunnel for the tunnel expansion of the present invention, the housing 60 is installed on the lining of the existing tunnel (10). Thus 20m of the housing 60 having a length of about 40m to protrude at the entrance of the existing tunnel 10 so as not to interfere with the vehicle using the existing tunnel 10, the auger excavator 70 in the remaining 20m Install the excavation equipment 40 is installed, and using the hydraulic jack at the entrance of the existing tunnel 10 to excavate the housing 60 into the soil of the upper lining of the existing tunnel 10, using the auger excavator 70 By forming the expansion tunnel excavation cavities 30 and moving to the next step again to form the expansion tunnel excavation cavities 30 by using the auger excavator 70 iteratively and step by step.

4 and 5 is a view showing an expansion tunnel drilling cavities formed along the planar tunnel cross-section by installing a housing in the existing tunnel of the present invention and perforated the unit drilling holes for the expansion of the tunnel.

By using the auger excavator 70 of the excavating equipment 40 mounted on the support 61 installed in the housing 60 to sequentially drill along the planar end section of the expansion tunnel to form an expansion tunnel excavation cavity wall 30 will be.

6 is a view showing that the tunnel expansion of the present invention is completed, the cross section of the expansion tunnel 20 is completely formed to show that the tunnel is completely expanded by removing the existing tunnel 10.

7 is a view showing a step of drilling a unit excavation step by step for the expansion of the tunnel of the present invention.

In order to form the expansion tunnel excavation hole wall 30 along the expansion tunnel plan cross-section, the drilling unit 80 is drilled, and the drilling sequence 81 drills by skipping one excavation hole and then one of the portions to be drilled. When explaining according to the sign as a method of forming the excavation hole in the portion skipped, drill the drill sequence (81) No. 1 excavation hole, and then skip to drill the drilling sequence (81) No. 2 excavation hole, and then drill Step (81) The process of forming the drill hole (81) and the third drill hole between the first drill hole and the second drill hole is to repeatedly drill the installation along the plan section of the expansion tunnel (20).

Each time the drilling operation is completed, the reinforcing and assembling the reinforcing bar in each of the excavation hole and repeat the work of pouring concrete. In other words, the construction is performed by the drilling procedures given in the drawings.

8 is a view showing an auger excavator mounted on an excavation apparatus used to construct an expansion tunnel unit excavation hole of the present invention, an auger excavator mounted on an excavation equipment 40 installed on the lining of the existing tunnel 10 ( 70). The auger excavator 70 has a length of about 12 m, and an auger installed in the casing 72 is installed. When the auger rotates and excavates into the soil, the casing 72 enters the excavation hole and the unit excavation hole 80 is formed. Will be. Soils where such equipment is available are applied to soils composed of rock, such as weathered rock and soft rock crushing zones.

9 is a view showing a state in which the construction of the unit excavation hole using the excavation equipment of the present invention, in order to form the expansion tunnel excavation ball wall 30 described in Figure 7 along the expansion tunnel plan section (unit excavation hole ( 80 is to be perforated according to the drilling sequence 81. To form such an extended tunnel excavation hole wall (30) through the process of drilling the unit excavation hole 80 in a funnel shape as shown in this figure through the expansion tunnel excavation The empty wall 30 is installed. The expansion tunnel 20 is installed by performing the operation of the expansion tunnel drilling pit wall 30 step by step. At this time, the depth of each unit excavation hole (80) is 12m and when drilling the unit excavation hole 80 in a funnel shape as shown in Figure 9 the other unit excavation hole 80 adjacent to the unit excavation hole 80 When drilling along the planar section of the expansion tunnel 20, the inlet of the unit excavation hole 80 is drilled so that about 3m 82 of the excavation site overlaps with each other at the end of the adjacent unit excavation hole 80. This drilling is to prevent the soil from being disturbed and the bearing strength is weakened and collapsed when the drilling is started by the auger excavator 70 at the inlet of each unit drilling hole 80.

       As described above, the present invention relates to a construction method for extending a tunnel by using an existing tunnel, and using a method of expanding a tunnel by using an existing tunnel, compensation of paper required when extending a separate tunnel and It can reduce the effort and cost of the purchase, and does not need to establish a separate traffic communication plan according to the expansion, and uses the existing tunnel compared to the construction cost and construction period required when expanding the separate tunnel. It is a very economical construction method that can significantly reduce the construction cost and construction period by expanding, and is an environmentally friendly construction method that can minimize the destruction of nature when expanding by using existing tunnels.

Claims (8)

       In the expansion tunnel that expands the width of the existing tunnel without affecting the traffic of the existing tunnel, the housing of a certain length is installed on the lining of the existing tunnel, and the excavation equipment equipped with the auger excavator is installed on the support installed in the housing. Step by step drilling the unit drilling holes of a certain size, after laying the reinforcing bars to squeeze concrete to form the expansion tunnel excavation wall wall, and to excavate the soil between the lining of the existing tunnel and the expansion tunnel excavation wall wall sequentially. Expansion tunnel using an existing tunnel constructed in the ground conditions consisting of rock, characterized in that to install the expansion tunnel.        The method of claim 1,        The housing is installed by the hydraulic jack along the upper lining of the existing tunnel, the housing is to form a steel plate lining of the existing tunnel and to install the support to mount the drilling equipment by installing the H beam in the middle of the housing An extended tunnel using an existing tunnel constructed under ground conditions consisting of rock.        The method according to claim 1 or 2,        The housing is installed in the ground condition consisting of a rock, characterized in that the installation part so as to protrude to the tunnel inlet side and the excavation equipment is installed in the rest, the front portion of the housing to be excavated into the upper ground lining of the existing tunnel Expansion tunnel using existing tunnel.        The method according to any one of claims 1 to 3,        The length of the housing is 40m, and about half of the housing is installed so as to protrude at the tunnel inlet side, and in the center of the ground conditions consisting of rock drilling equipment, characterized in that the drilling equipment is mounted on the support to install the drilling equipment equipped with auger excavator Expansion tunnel using existing tunnel.        The method of claim 1,        The unit excavation hole is to be drilled and installed by the auger excavator along the expansion tunnel plan cross section, the drilling length is 12m, when the drilling is completed, the reinforcing bars are installed in the unit excavation hole and concrete is laid to expand the expansion tunnel plan Expansion tunnels using existing tunnels constructed on the ground conditions consisting of rock, characterized in that the installation along the cross section to install the expansion tunnel excavation wall.        The method according to claim 1 or 5,        The expansion tunnel excavation wall is installed by a combination of unit excavation holes drilled using an auger excavator along the plan section of the expansion tunnel, and the drilling sequence is excavated by skipping one excavation hole, and then one of the parts to be drilled next. As a method of forming an excavation hole in the part skipped, drill the excavation hole No. 1 in the construction order, and then drill the excavation hole No. 2 in the construction order, and then between the excavation hole No. 1 and the excavation no. Construction sequence Formed by repeating the process of forming three excavation holes, each time to drill a unit excavation hole is made of a rock characterized in that the reinforcement of the reinforcement of the reinforcement and install the concrete repetitive work Expansion tunnel using existing tunnel constructed under ground condition.        The method according to claim 1 or 6,        In order to form the expansion tunnel excavation wall, the unit drill hole is formed stepwise in the shape of a funnel along the planar cross section of the expansion tunnel, and the length of the unit excavation hole is 12 m. Existing tunnels constructed on rocky ground conditions are characterized by installing an extended tunnel excavation wall with an overlapping length of the excavation site, which overlaps a certain length of the entrance of the unit excavation hole, which is drilled adjacent to the end portion, to 3m. Extended tunnel. a) installing the housing on the lining top by installing the housing on the lining top of the existing tunnel and slowly entering the soil on the lining of the existing tunnel with a hydraulic jack; b) installing an excavation equipment equipped with an auger excavator in the housing and drilling a unit drilling hole step by step; c) assembling and installing reinforcing bars in the unit excavation hole and pouring concrete to form an expansion tunnel excavation hole wall; d) digging and removing rock between the existing tunnel lining and the expansion tunnel excavation wall; e) The housing is moved forward for the next excavation, using the excavation equipment installed in the housing to drill the unit excavation hole to install reinforcing bars and to pour concrete to form the expansion tunnel excavation cavity wall, lining of the existing tunnel Repeating the excavation and removal of the rock between the expansion tunnel excavation cavity wall and terminating the expansion of the tunnel; And f) Existing tunnels constructed on rocky ground conditions comprising the steps of arranging and paving the road surface to communicate the traffic of the completed expansion tunnel and installing a facility such as lighting in the tunnel to use the tunnel. Extended tunnel construction method

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