KR20140129898A - Steel pipe press-fitted pilot tunnel and tunnel excavation method using steel pipe pilot tunnel - Google Patents
Steel pipe press-fitted pilot tunnel and tunnel excavation method using steel pipe pilot tunnel Download PDFInfo
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- KR20140129898A KR20140129898A KR20130048810A KR20130048810A KR20140129898A KR 20140129898 A KR20140129898 A KR 20140129898A KR 20130048810 A KR20130048810 A KR 20130048810A KR 20130048810 A KR20130048810 A KR 20130048810A KR 20140129898 A KR20140129898 A KR 20140129898A
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Abstract
Description
The present invention relates to a tunnel excavation method using a steel pipe indentation pilot tunnel and a steel pipe pilot tunnel. More particularly, to a tunnel excavation method using a steel pipe press-fit pilot tunnel and a steel pipe pilot tunnel in which a steel pipe is press-fitted to construct a pilot tunnel and then a main tunnel is excavated.
One of the most frequently used construction methods is a method in which a buried steel pipe is pressurized by using a hydraulic jack at the back of the tunnel excavation direction and the excavation is carried out by removing the gravel and the like entering into the steel pipe to the outside. This method is difficult to apply in the case of hard ground such as rock.
As a rock excavation method that is used as a method of constructing a tunnel on a ground including a rock or a rock, there is TBM (tunnel boring machine) excavation method for drilling using a drill bit. The TBM method has a low efficiency of excavation when the equipment is expensive and the rock strength is high.
Another common method of constructing tunnels on the ground, including rock masses, is the NATM method using gunpowder blasting.
Generally, bi-directional excavation is carried out in terms of process control in tunnel excavation. In order to proceed bi-directional excavation, the excavation equipment should be able to enter in both directions. However, according to the construction environment, when the excavation equipment can not enter in both directions, it is inevitable to proceed with one-way excavation.
When one-way excavation proceeds, the closer to the slope on the opposite side, the more weathered rocks and weathered soil appear. Therefore, it is difficult to proceed the excavation by the conventional NATM method. Even if unidirectional excavation proceeds in the conventional manner, the excavation speed becomes slower and the cost increases as the slope approaches the opposite slope.
In addition, even if the excavation equipment is mounted on the slope on the opposite side, it is often difficult to process the work such as soil and weathered rock on the slope side on the slope side. For example, when the slope on the opposite side is in contact with the river and the slope is urgent, it is difficult to secure the entrance to the slope on the opposite side or to treat the work such as sand or weathering that occurs on the slope on the opposite side.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to solve the above-mentioned problems by providing a pilot tunnel using a steel pipe indentation method, which is excavated and penetrated to the opposite side slope, This paper proposes a steel pipe indentation pilot tunnel and a tunnel excavation method using the same to allow tunnel excavation by applying free surface blasting using a tunnel as a free surface.
In order to solve the above problems, according to one aspect of the present invention, in a pilot tunnel formed by press-fitting of a large diameter steel pipe capable of internal work, steel pipe segments are connected to form a steel pipe wall of a pilot tunnel, The segments include: a first segment that occupies more than half of the circumferential steel pipe circumference; A second segment which is fitted in the inner direction of the first segment and the circumference of the steel pipe and detachably coupled inward to form a steel pipe circumference; And a plurality of first fastening means coupled to the first segment and the second segment so as to engage or disengage the first and second segments in the inner direction of the steel pipe circumference. A pilot tunnel is proposed.
At this time, in one example, the indentation propelled steel pipe comprises: a plurality of steel pipe segments; And a plurality of second fastening means connecting the steel pipe segments and performing or releasably engaging the steel pipe segments in the inner direction of the steel pipe circumference.
Further, in one example, a passage formed higher than the inner bottom of the steel pipe may be provided on the inner lower portion of the press-impelled steel pipe.
According to another example, the pilot tunnel penetrates the opposite side of the direction in which the steel pipe is press-fitted, and the pilot tunnel is formed at a depth of at least one of the openings of both sides of the steel pipe- At least one steel pipe segment including at least the outermost periphery correspondingly can be disassembled.
Further, in one example, the tip end of the pilot tunnel is located in the soft rock section, and the excavation progress surface of the pilot tunnel can be formed in front of the tip of the steel pipe press-fitted into the pilot tunnel.
In another example, the tip of the pilot tunnel is located in the weathered rock or weathering soil zone, and the tip of the press-fitted steel pipe may be ahead of the excavation progress surface of the pilot tunnel.
According to another aspect of the present invention, there is provided a pilot excavating step of excavating a steel pipe press-fitting pilot tunnel according to any one of the above-described embodiments to solve the above-described problems. A penetrating step of penetrating the steel pipe press fitting pilot tunnel to the slope opposite to the steel pipe press-in direction; A shaft portion forming step of forming a shaft portion on the opposite side sloped surface; And a main tunnel excavation step of disassembling the steel pipe segment at the shaft side and excavating the main tunnel with the pilot tunnel section in which the steel pipe segment is disassembled as an additional free surface.
At this time, in one example, the method further includes the step of forming a strong wall for forming a strong wall for the steel pipe indentation prior to the pilot excavation step, wherein the step of forming the strong wall comprises the steps of: A preliminary advanced excavation step of excavating the preliminary advanced excavation; An open tunnel excavation step in which the open end of the preliminary advanced draft is bent toward the planned section direction side of the pilot tunnel in order to provide a space for propelling the steel pipe indentation; And a strong wall forming step of forming a strong wall by using a natural rock on the rear side in the predetermined cross-sectional direction of the pilot tunnel left in accordance with the piercing excavation.
Also, in one example, the pilot tunnel excavation step may include performing boring in the forward direction to determine the ground condition, proceeding excavation of the steel pipe indentation pilot tunnel, and, in the pilot tunnel excavation step, The pilot tunnel excavation is carried out by pressing the excavation surface of the pilot tunnel formed forward or at the same position of the front end of the press-fitted steel pipe through the steel pipe to a predetermined depth and pressing the steel pipe into the excavated section, , When the tip of the pilot tunnel is located in the weathered rock or weathered soil section, the excavation surface of the pilot tunnel, which is formed behind the tip of the press-fitted steel pipe entering through the steel pipe, is advanced to the excavation planned surface formed behind the tip of the steel pipe The steel pipe is press-fitted as much as the excavation section from the excavation surface to the excavation planned surface Pilot tunnel excavation can be carried out.
In another example, in the penetrating step, the excavation surface of the pilot tunnel formed behind the tip of the press-fitted steel pipe entering through the steel pipe is excavated to the excavation planned surface formed behind the tip of the steel pipe, And the steel pipe can be penetrated to the opposite slope by repeating the process of press fitting the steel pipe corresponding to the excavation section up to the surface.
According to one example, in the shank part forming step, the self-moving excavation construction equipment is moved to the opposite side slope through the penetrated pilot tunnel, and the shank work space is prepared and excavated using the construction equipment for excavation on the opposite side slope A shaft portion can be provided and a main tunnel excavation section can be secured.
In another example, the disassembly of the steel tube segment can be accomplished by dismantling the first fastening means, dismounting the second segment, and dismounting the first segment.
At this time, in one example, the disassembly of the steel tube segment comprises: making the outermost steel tube segment separable from the immediately preceding steel tube segment and preparing for disassembly of the outermost steel tube segment; Disassembling the first fastening means in the outermost steel pipe segment and separating the second segment inward of the circumference of the steel pipe using the hydraulic jack for disassembling the steel pipe provided between the second segment and the second segment; And a step of crushing the first segment in the inner direction of the circumference of the steel pipe using the hydraulic jack for dismantling the steel pipe installed in the area facing the first segment and pulling the first segment out of the pilot tunnel.
Also, in one example, in the main tunnel excavation step, the steel pipe is disassembled from the shaft portion side and the excavation proceeds in one direction, or the steel pipe is disassembled from the pilot tunnel inlet side simultaneously or sequentially opposite to the shaft portion side, Blasting and excavation and bi-directional excavation can proceed.
In this case, in one example, excavation of the main tunnel can proceed with excavation at the front end with the pilot tunnel as the free surface, or can proceed with the sectional excavation.
At this time, in one example, in the main tunnel excavation step, the disassembled steel pipe and the blasted and excavated rock can be transported to the opposite side through the pilot tunnel.
According to an embodiment of the present invention, a pilot tunnel using a pilot tunnel, for example, a steel pipe indentation method, is drilled to the opposite side slope, and the work equipment is provided on the opposite side slope to complete the reinforcement work, Tunnel excavation can be efficiently performed by applying free surface blasting using the tunnel as a free surface.
It is apparent that various effects not directly referred to in accordance with various embodiments of the present invention can be derived by those of ordinary skill in the art from the various configurations according to the embodiments of the present invention.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a schematic view showing a section of a steel pipe segment used in a pilot tunnel according to one example of the present invention. FIG.
1B is a view schematically showing a side cross-section of a steel pipe segment used in a pilot tunnel according to one example of the present invention.
2A is a diagram schematically showing a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention.
FIG. 2B is a diagram schematically showing a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention. FIG.
3A and 3B are views schematically showing a pilot tunnel excavation state of a tunnel excavation method using a steel pipe pilot tunnel according to an embodiment of the present invention.
FIG. 4 is a view schematically showing an excavation state at a shaft portion side in a tunnel excavation method using a steel pipe pilot tunnel according to an example of the present invention.
FIG. 5A is a view schematically showing an excavation section of a preliminary advanced skeleton seen from the direction AA 'in FIGS. 3A and 3B. FIG.
5B is a view schematically showing a pilot tunnel entrance section viewed from the direction BB 'of FIGS. 3A and 3B.
FIG. 5C is a view schematically showing a shank-side excavation surface viewed in the CC 'direction in FIG.
FIG. 6 is a plan view schematically showing a state in which a steel pipe is press-fit using a force wall in a tunnel excavation method using a steel pipe pilot tunnel according to another embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of a first embodiment of the present invention; Fig. In the description, the same reference numerals denote the same components, and a detailed description may be omitted for the sake of understanding of the present invention to those skilled in the art.
As used herein, unless an element is referred to as being 'direct' in connection, combination, or placement with other elements, it is to be understood that not only are there forms of being 'directly connected, They may also be present in the form of being connected, bonded or disposed. The same is true of terms that include the meaning of 'contact' such as 'on', 'above', 'below', or 'below'. Directional terms may be construed to encompass corresponding relative directional concepts as the reference element is inverted or its direction is changed.
It should be noted that, even though a singular expression is described in this specification, it can be used as a concept representing the entire constitution unless it is contrary to, or obviously different from, or inconsistent with the concept of the invention. It is to be understood that the phrases "including", "having", "having", "comprising", etc. in this specification are intended to be additionally or interchangeable with one or more other elements or combinations thereof.
BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which: FIG.
A steel pipe indentation pilot tunnel according to one embodiment of the present invention will be described in detail with reference to the drawings. Here, reference numerals not shown in the drawings to be referred to may be reference numerals in other drawings showing the same configuration.
FIG. 1A is a schematic cross-sectional view of a steel pipe segment used in a pilot tunnel according to one example of the present invention, and FIG. 1B is a side view of a steel pipe segment used in a pilot tunnel according to one example of the present invention 2A schematically shows a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention, and FIG. 2B illustrates a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention 3A and 3B are views schematically showing a pilot tunnel excavation state of a tunnel excavation method using a steel pipe pilot tunnel according to one embodiment of the present invention, and Fig. 4 is a schematic view showing an example of the present invention FIG. 2 is a view schematically showing an excavation state at a shaft portion side in a tunnel excavation method using a steel pipe pilot tunnel according to the present invention.
1A through 4, a steel pipe press fitting
Referring to FIG. 1A, a
For example, the
The
Next, a plurality of first fastening means 15 join the
Next, referring to FIG. 1A, another example will be described. In the
1A,
Next, another example of the pilot tunnel will be described with reference to FIG. 1B. Referring to FIG. 1B, the
The plurality of second fastening means 16 are formed so as to connect the
3A, 3B and 4, in one example, the
Referring to FIG. 1A, after the
Next, another example will be described with reference to FIG. 2A. Referring to FIG. 2A, the tip end of the
Another example will be described with reference to FIG. 2B. For example, the tip of the
Next, in order to solve the above-mentioned problems, a tunnel excavation method using a steel pipe pilot tunnel according to another aspect of the present invention will be described in detail with reference to the drawings. At this time, embodiments of the above-described pilot tunnels and FIGS. 1A and 1B will be referred to, and thus redundant explanations may be omitted.
FIG. 2A schematically shows a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention, FIG. 2B is a view schematically showing a pilot tunnel and a pilot tunnel excavation state according to one example of the present invention, FIGS. 3A and 3B are views schematically showing a pilot tunnel excavation state of a tunnel excavation method using a steel pipe pilot tunnel according to an embodiment of the present invention. FIG. 4 is a cross- FIG. 5A is a view schematically showing an excavation section of a preliminary advanced skeleton seen from the direction AA 'of FIGS. 3A and 3B, and FIG. 5B is a view schematically showing the excavation state of the excavation state at the shaft portion side in FIGS. 5B is a view schematically showing a pilot tunnel entrance section viewed from the direction BB 'of FIG. 4, and FIG. 5C is a cross- A side view schematically showing the excavated surface, Figure 6 is a plan view schematically showing a press-fitted steel pipe driving state with the force wall of the tunnel excavation method using a steel pipe pilot tunnel according to another embodiment of the present invention.
3A, 3B and 4, a tunnel excavation method using a steel pipe pilot tunnel according to one example includes a pilot excavation step (see FIGS. 3A and 3B), a pilot tunnel penetrating step (see FIGS. 3A, 3B and 4) (See FIG. 4) and a main tunnel excavation step (see FIG. 4). 6, in another example, the tunnel excavation method may further include a step of forming a strong wall before the pilot excavation step.
First, in accordance with one example of a tunnel excavation method, a pilot tunnel penetration step (see FIGS. 3A, 3B and 4), a shaft section forming step (see FIG. 4), and a main tunnel excavation Step (see FIG. 4) will be briefly described. Next, the order of the excavation wall formation will be described in order from the excavation wall formation step.
Referring to FIGS. 3A and 3B, in the pilot excavation step, a
At this time, the
For example, the
1A, in one example, in the
1B, another example is shown. In the pilot tunnel penetrating step, the
Next, in the pilot tunnel penetration step, the steel pipe press fitting
At this time, the
In this case, the
Next, referring to FIG. 4, the
4, in the main tunnel excavation step, the
At this time, according to one example, in the main tunnel excavation step, the
3 and 4), a pilot tunnel penetrating step (see Figs. 3A, 3B and 4), a shank part forming step (see Fig. 4) ) And the main tunnel excavation step (see FIG. 4).
Referring to FIG. 6, in one example, the tunnel excavation method may further include a step of forming a strong wall prior to the pilot excavation step (see FIGS. 3A and 3B). At this time, in the step of forming a strong wall, the
6, in one example, the step of forming a strong wall includes a step of excavating the preliminary advanced skeleton 2 (see the excavation direction in FIG. 6), a drilling step ), And forming a strong wall.
At this time, the preliminary
For example, in one example, the pilot tunnel expected section is formed to deviate to one side from the center of the main tunnel section. At this time, in the step of excavating the preliminary advanced trestle 2 (see the excavation direction in Fig. 6), the excavation proceeds on the opposite side of the planned section of the pilot tunnel with respect to the center of the main tunnel section. For example, the preliminary
For example, referring to FIG. 6, in the step of excavating the preliminary
For example, referring to FIG. 5A, a preliminary
Next, in order to provide a space for pushing in the
Subsequently, in the step of forming the powerful wall body, the
At this time, according to one example, in the step of forming a strong wall, the surface of the rear natural rock can be trimmed or the concrete 4 'can be poured on the surface to form the
Next, the pilot tunnel excavation step (see Figs. 3A and 3B) proceeds after the step of forming a strong wall. In the pilot tunnel excavation step, the
For example, the
In general, it is common to push the
In the case where it is difficult for the work equipment to enter the
Figure 5b shows a section of the pilot tunnel inlet. In this case,
For example, according to one example, in the pilot tunnel excavation step, boring can be performed on the
For example, referring to FIG. 2A, in one example, in the pilot tunnel excavation step, when the distal end portion (refer to 5a) of the
2b, in the pilot tunnel excavation step, when the leading end portions (refer to 5a and 5a ') of the
Next, with reference to FIGS. 2B, 3A, 3B and 4, the pilot tunnel penetration step will be described in detail after the pilot tunnel excavation step. In the pilot tunnel penetration step, the steel pipe press fitting
Since the pilot tunnel penetrating step is performed substantially in the weathering soil or the weathered rock section, the description in Fig. 2B described above can be referred to. For example, in one penetration step, an excavation surface (reference numeral 5a ') of the
Next, the shank part forming step after the pilot tunnel penetrating step will be described in detail. In the shaft portion forming step, the
In one example, in the pier forming step, the self-moving excavation equipment is moved from the penetrating
Next, the main tunnel excavation step performed after the shank portion forming step will be described in detail. Referring to FIG. 4, in the main tunnel excavation step, the
For example, in one example, the main tunnel excavation step may include dismantling the large
At this time, in one example, in the main tunnel excavation step, excavation can proceed in one direction from the
1A, the
At this time, in one example, disassembly of the
Next, in the step of separating the
Subsequently, in the step of pulling out the
Referring to FIG. 5C, according to one example, excavation of the main tunnel in the main tunnel blasting and excavation step may be performed by advancing the front section excavation or performing the sectional excavation with the
For example, in one example, in the main tunnel excavation step, the
The foregoing embodiments and accompanying drawings are not intended to limit the scope of the present invention but to illustrate the present invention in order to facilitate understanding of the present invention by those skilled in the art. Embodiments in accordance with various combinations of the above-described configurations can also be implemented by those skilled in the art from the foregoing detailed description. Accordingly, various embodiments of the present invention may be embodied in various forms without departing from the essential characteristics thereof, and the scope of the present invention should be construed in accordance with the invention as set forth in the appended claims. Alternatives, and equivalents by those skilled in the art.
1: Main tunnel interface or main tunnel 1 ': Main tunnel
2: Preliminary
3: Widening
4: Natural rock for strong or strong walls
4 ': Concrete 4a: Impact wall
5: Pilot tunnel 5 ': Unit excavation section in pilot tunnel
5a: Excavation surface or excavation progress surface or excavation planned surface
5a ': Excavation surface in the previous stage 6: Steel pipe support
7:
7b: Excavation surface on the
9: opposite
9b: opposite slope after work 10: steel pipe or steel pipe segment
10a: Outermost
11: first segment 13: second segment
15: first fastening means 16: second fastening means
17: Corridor 20: Hydraulic jack for dismantling steel pipe
21: Vertical hydraulic jack 23: Horizontal hydraulic jack
30: Hydraulic jack for press fitting the steel pipe 31:
Claims (16)
The steel pipe segments are connected to form a steel pipe wall of the pilot tunnel,
The steel tube segment comprises:
A first segment occupying more than half of the circumferential steel pipe circumference;
A second segment which is fitted in the inner direction of the first segment and the circumference of the steel pipe and is detachably coupled in the inward direction and forms the circumference of the steel pipe; And
And a plurality of first fastening means coupled to the first segment and the second segment and configured to engage or disengage the first and second segments in an inner direction of the steel pipe circumference. Steel pipe indentation pilot tunnel.
Wherein the steel pipe to be press-fit is a plurality of the steel pipe segments; And a plurality of second fastening means connecting the steel pipe segments to each other to perform engagement or disengagement of the steel pipe segments in the inner direction of the steel pipe circumference.
And a passage formed at an inner lower portion of the steel pipe to be press-inserted and higher than an inner bottom of the steel pipe.
The pilot tunnel penetrates the opposite side of the steel pipe in the press-fitting direction,
Wherein at least one of said steel tube segments including at least an outermost portion corresponding to a depth of blasting excavation for detachment of a free-surface tunnel having at least one side of said pilot tunnel into which said steel pipe is inserted is provided with said pilot tunnel as an additional free surface, Wherein the steel pipe is a steel pipe.
The tip end of the pilot tunnel is located in a soft rock section,
Wherein the excavation progress surface of the pilot tunnel is formed forward of the tip of the steel pipe press-fitted into the pilot tunnel.
The tip end of the pilot tunnel is located in the weathered rock or weathered soil section,
Wherein a tip end of the press-fitted steel pipe is ahead of an excavation progress surface of the pilot tunnel.
A penetrating step of penetrating the steel pipe press fitting pilot tunnel to a slope opposite to the steel pipe press-in direction;
A shank portion forming step of forming a shank portion on the sloped opposite side surface; And
And a main tunnel excavating step of disassembling the steel pipe segment at the shaft portion side and excavating the main tunnel with the pilot tunnel section in which the steel pipe segment is disassembled as an additional free surface.
Further comprising a strong wall forming step of forming a strong wall wall for the steel pipe indentation before the pilot excavation step,
Wherein the step of forming the strong wall comprises:
A preliminary advanced drilling step of excavating the preliminary advanced dredge by a predetermined section in a section that does not overlap with the planned section direction of the pilot tunnel;
A tunnel tunneling step of bending the tunnel from the distal end of the preliminary advanced trunk to the side of the predetermined tunnel cross-sectional direction in order to provide a space for propelling the steel pipe; And
And a strong wall forming step of forming the strong wall by using a natural rock on the rear side in the direction of a predetermined cross section of the pilot tunnel left after the drilling.
The pilot tunnel excavation step may include boring the tunnel in the forward direction to determine the ground condition and proceed with excavation of the steel pipe press-fit pilot tunnel,
The excavation surface of the pilot tunnel, which is formed in the pilot tunnel at the front or at the same position as the tip of the press-fitted steel pipe, enters through the steel pipe when the front end of the pilot tunnel is located in the soft- And the excavation of the pilot tunnel is continued by press-fitting the steel pipe as much as the excavated section,
The excavation surface of the pilot tunnel, which is formed at the rear of the tip of the press-fitted steel pipe, enters through the steel pipe when the leading end of the pilot tunnel is located in the weathered rock or weathered soil section in the pilot tunnel excavation step, Wherein the tunnel excavation is performed by advancing the excavation to the excavation planned surface formed on the rear side and pressing the steel pipe corresponding to the excavation section from the excavation surface to the excavation planned surface, Way.
The excavation surface of the pilot tunnel, which is formed at a rear side of the front end of the press-fitted steel tube, is advanced to a planned excavation surface formed behind the front end of the steel pipe, and at the excavation surface, Wherein the step of inserting the steel pipe corresponding to the excavation section to the excavation planned surface is carried out or the process is repeated and the steel pipe is penetrated to the opposite slope.
The slip part forming step moves the self-moving excavation equipment through the pilot tunnel passing through the slope to the opposite side slope, and the shafts work space is prepared and excavated on the opposite side slope using the excavation construction equipment, Wherein a shaft portion is provided and the main tunnel excavation end face is secured.
Wherein the steel tube segment is dismantled by disassembling the steel tube segment in the order of disassembling the first fastening means, separating the second segment, and extracting the first segment.
The disassembly of the steel tube segment is carried out by:
Making the outermost steel tube segment separable from the immediately preceding steel tube segment and preparing for disassembly of said outermost steel tube segment;
Disassembling the first fastening means in the outermost steel pipe segment and separating the second segment inward of the circumference of the steel pipe using a hydraulic jack for disassembling the steel pipe provided between the second segment and the opposite side of the second segment ; And
And squeezing the first segment in the inner direction of the steel pipe circumference by using the hydraulic jack for dismantling the steel pipe installed in the area facing the first segment and extracting the first segment out of the pilot tunnel A method of tunnel excavation using a steel pipe pilot tunnel.
In the main tunnel excavation step, the steel pipe is disassembled from the shaft portion side and the excavation proceeds in one direction or the steel pipe is disassembled from the pilot tunnel inlet side simultaneously or sequentially opposite to the shaft portion side, and the pilot tunnel is set as a free surface Wherein the tunnel excavation is performed by blasting and drilling.
Wherein the excavation of the main tunnel progresses front end section excavation using the pilot tunnel as the free surface or progresses to a sectioned section excavation.
Wherein in the main tunnel excavation step, the disassembled steel pipe and the blasted and excavated rock are transferred to the opposite side through the pilot tunnel at the shaft portion side.
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| KR20130048810A KR20140129898A (en) | 2013-04-30 | 2013-04-30 | Steel pipe press-fitted pilot tunnel and tunnel excavation method using steel pipe pilot tunnel |
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| KR20130048810A KR20140129898A (en) | 2013-04-30 | 2013-04-30 | Steel pipe press-fitted pilot tunnel and tunnel excavation method using steel pipe pilot tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356593A (en) * | 2018-12-12 | 2019-02-19 | 青海大学 | A kind of headrace tunnel excavation construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356593A (en) * | 2018-12-12 | 2019-02-19 | 青海大学 | A kind of headrace tunnel excavation construction method |
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