CN112610221A - Construction method for oversized section and gradual change section of bifurcation part of highway tunnel - Google Patents
Construction method for oversized section and gradual change section of bifurcation part of highway tunnel Download PDFInfo
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- CN112610221A CN112610221A CN202011481157.2A CN202011481157A CN112610221A CN 112610221 A CN112610221 A CN 112610221A CN 202011481157 A CN202011481157 A CN 202011481157A CN 112610221 A CN112610221 A CN 112610221A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000009412 basement excavation Methods 0.000 claims abstract description 20
- 230000007704 transition Effects 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 abstract description 4
- 239000011435 rock Substances 0.000 description 5
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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Abstract
The invention discloses a construction method of an oversized section and a gradual change section of a bifurcation part of a highway tunnel, belonging to the technical field of tunnel engineering and comprising the following steps: 1) excavating from the end part of the right branch road of the tunnel to the direction of the gradual change section, and excavating an upper right pilot pit in the large section; 2) applying temporary support to the upper right pilot tunnel excavated in the step 1); 3) digging a transition section of the tunnel from the upper right pilot tunnel upper step of the large-section forwards horizontally, and forming a right pilot tunnel upper step of the transition section after digging a distance; 4) and (3) performing primary support on the upper right pilot pit dug in the step 3) and simultaneously locking and reinforcing … … and the like. The method adopts the guide pits to penetrate through the super-large section in advance and strengthen the support of the head-tail section of the super-large section, and the special excavation method and the support mode can ensure the safety of the excavation process and avoid the situations of excessive vault settlement, arch wall convergence, unstable arch foot, serious bottom heave and the like caused by the over-large section; compared with the existing excavation method, the method has the advantages that the temporary support is less, and the support is easier to disassemble.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a construction method for an oversized section and a gradual change section of a bifurcation part of a hard surrounding rock tunnel.
Background
When the excavation section in underground engineering (including tunnel engineering) is large, the construction is called as a large section, and the large section is unfavorable for excavation stress in the construction engineering. The international tunneling association defines a freeboard area per square meter of greater than 100 as an oversized cross-section.
In the construction process of the ultra-large section hard surrounding rock tunnel, the traditional excavation method is a double-side-wall pit guiding method, a CD method, a CRD method and the like. Aiming at the tunnel with the super large section formed by the intersection of two small-section tunnels and the tunnel with the gradually-reduced section, the double-side-wall pit guiding method and the CRD method have better adaptability; however, the existing excavation method has more temporary supports, difficult support removal and large construction risk, and particularly for the junction formed by 400m2And the tunnel with the ultra-large section has the risks of bias instability of the middle rock pillar at a small clear distance section, the instability of surrounding rocks caused by large span and partial mining disturbance of the ultra-large section, and the risks of rock burst and the like even when the tunnel is deeply buried.
Disclosure of Invention
In view of the above, the invention aims to provide a construction method for an oversized section and a gradual change section of a bifurcation part of a highway tunnel, so as to solve the technical problems of more temporary supports, difficult support removal, larger span, large free surface, large construction risk and the like existing in the prior art for excavating the oversized section and the gradual change section of the bifurcation part of the tunnel.
The invention relates to a construction method of an oversized section and a gradual change section of a bifurcation part of a highway tunnel, which comprises the following steps:
1) excavating from the end part of the right branch of the tunnel to the direction of the gradual change section, and excavating an upper right pilot pit in the large section, wherein the upper right pilot pit extends from the end part of the right branch of the tunnel to the top of an arc at the starting part of the gradual change section in an inclined and upward manner;
2) applying temporary support to the upper right pilot tunnel excavated in the step 1);
3) digging a transition section of the tunnel from the upper right pilot tunnel upper step of the large-section forwards horizontally, and forming a right pilot tunnel upper step of the transition section after digging a distance;
4) applying primary support to the upper right pilot pit dug in the step 3) and simultaneously locking and reinforcing the opening;
5) performing transverse expanding excavation in the gradual change section to form an upper step of the gradual change section, and then performing primary support;
6) implementing reverse top raising on the upper right pilot tunnel of the oversized section, and timely implementing primary support and temporary portal after top raising is completed;
7) excavating from the gradual change section to the direction of a tunnel branch, excavating an upper step with a large section, and constructing primary support and erecting a temporary portal after the upper step with the large section is formed;
8) excavating the middle-lower part of a guide pit on the right side of the large-section from the tunnel bifurcation section to the tunnel transition section, and constructing an inverted arch in time;
9) digging out the middle step at the left side of the large-section, and applying primary support and temporary arch centering in time;
10) digging out a middle step in the middle of the large-section, and applying primary support and temporary arch centering in time;
11) digging out a lower step at the left side of the large-section, and constructing an inverted arch;
12) digging out a lower step in the middle of the large-section, and constructing an inverted arch;
13) and (4) completely excavating the large section and then applying a second lining.
The invention has the beneficial effects that:
the construction method of the super-large sections and the gradual change sections of the bifurcation parts of the highway tunnel adopts the guide pits to penetrate through the super-large section in advance and strengthen the support of the head-tail sections of the super-large sections, and the special excavation method and the support mode can ensure the safety of the excavation process and avoid the situations of excessive vault settlement, arch wall convergence, unstable arch springing, severe bottom bulging and the like caused by the overlarge sections; compared with the existing excavation method, the method has the advantages that the temporary support is less, and the support is easier to disassemble.
Drawings
Fig. 1 is a plan view of the general step sequence of the construction of the oversized cross section of the bifurcation part, wherein arrows represent the excavation direction, and I, II, III, IV and V in the drawing respectively represent the excavation sequence.
FIG. 2 is a schematic diagram of excavating an upper right pilot tunnel in the step 1);
FIG. 3 is a schematic diagram of the right-side upper step of the pilot tunnel that is dug into the transition section to form the transition section in step 3);
FIG. 4 is a schematic view of a locking notch reinforcement;
FIG. 5 is a schematic view of a reverse flip top;
fig. 6 is a schematic view of an upper step with a large cross section dug from the transition section to the branch opening of the tunnel and a temporary gantry applied in step 7);
FIG. 7 is a schematic structural diagram of a temporary portal;
FIG. 8 is a schematic diagram of the excavation sequence of steps 8) -12);
fig. 9 is a top plan schematic view of a tunnel.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in the figure, the construction method of the ultra-large section and the gradual change section of the road tunnel bifurcation part of the embodiment comprises the following steps:
1) and excavating from the end part of the right branch of the tunnel to the direction of the transition section, as shown in fig. 2, excavating an upper right pilot pit 1 in the large-section, wherein the upper right pilot pit obliquely extends upwards from the end part of the right branch of the tunnel to the top of the arc at the beginning of the transition section.
2) And (3) applying temporary support to the upper right pilot tunnel dug in the step 1).
3) The transition section of the tunnel is dug horizontally forward from the upper right pit guiding step of the large section, and as shown in fig. 3, the right pit guiding step of the transition section is formed after digging for a certain distance.
4) And (3) applying primary support to the upper right pilot pit dug in the step 3) and simultaneously locking the opening for reinforcement, as shown in figure 4.
5) And performing transverse expanding excavation in the transition section, wherein the excavation direction is the direction indicated by an arrow at the part III in the figure 1, forming an upper step of the transition section, and then performing primary support.
6) And (3) implementing reverse top raising on the upper right pilot tunnel of the oversized section as shown in figure 5, and timely implementing primary support 2 and temporary portal 3 after top raising is completed.
7) Excavating from the gradual change section to the direction of a tunnel branch, excavating an upper step with a large section, wherein the excavating direction is the direction indicated by the arrow of the V part in figure 1, and constructing primary support and erecting a temporary portal frame after the upper step with the large section is formed.
8) And excavating the middle lower part of the guide pit on the right side of the large-section from the tunnel bifurcation section to the tunnel transition section, wherein the excavated part is shown as a serial number I in the figure 8, and an inverted arch is constructed in time.
9) And digging out the middle step at the left side of the large-section, wherein the digging part is shown as a serial number II in the figure 8, and constructing primary support and a temporary arch in time.
10) And digging out the middle step in the middle of the large-section, wherein the digging part is shown as a sequence number III in figure 8, and constructing primary support and temporary arch centering in time.
11) And digging out the lower step at the left side of the large-section, wherein the digging part is shown as a serial number (r) in the figure 8 and is constructed as an inverted arch.
12) Digging out the lower step in the middle of the large section, and constructing an inverted arch at the digging part as shown by the serial number (v) in figure 8.
13) And (4) completely excavating the large section and then applying a second lining.
According to the construction method of the super-large sections and the gradual change sections of the bifurcation parts of the highway tunnel, the guide pits are adopted to penetrate through the super-large section in advance, and the head-to-tail section support of the super-large section is strengthened, so that the safety of an excavation process can be ensured by the special excavation method and the support mode, and the situations of excessive vault settlement, arch wall convergence, unstable arch springing, severe bottom bulging and the like caused by the overlarge sections can be avoided; compared with the existing excavation method, the method has the advantages that the temporary support is less, and the support is easier to disassemble.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (1)
1. A construction method for an oversized section and a gradual change section of a bifurcation part of a highway tunnel is characterized by comprising the following steps: the method comprises the following steps:
1) excavating from the end part of the right branch of the tunnel to the direction of the gradual change section, and excavating an upper right pilot pit in the large section, wherein the upper right pilot pit extends from the end part of the right branch of the tunnel to the top of an arc at the starting part of the gradual change section in an inclined and upward manner;
2) applying temporary support to the upper right pilot tunnel excavated in the step 1);
3) digging a transition section of the tunnel from the upper right pilot tunnel upper step of the large-section forwards horizontally, and forming a right pilot tunnel upper step of the transition section after digging a distance;
4) applying primary support to the upper right pilot pit dug in the step 3) and simultaneously locking and reinforcing the opening;
5) performing transverse expanding excavation in the gradual change section to form an upper step of the gradual change section, and then performing primary support;
6) implementing reverse top raising on the upper right pilot tunnel of the oversized section, and timely implementing primary support and temporary portal after top raising is completed;
7) excavating from the gradual change section to the direction of a tunnel branch, excavating an upper step with a large section, and constructing primary support and erecting a temporary portal after the upper step with the large section is formed;
8) excavating the middle-lower part of a guide pit on the right side of the large-section from the tunnel bifurcation section to the tunnel transition section, and constructing an inverted arch in time;
9) digging out the middle step at the left side of the large-section, and applying primary support and temporary arch centering in time;
10) digging out a middle step in the middle of the large-section, and applying primary support and temporary arch centering in time;
11) digging out a lower step at the left side of the large-section, and constructing an inverted arch;
12) digging out a lower step in the middle of the large-section, and constructing an inverted arch;
13) and (4) completely excavating the large section and then applying a second lining.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011481157.2A CN112610221B (en) | 2020-12-15 | 2020-12-15 | Construction method for oversized cross section and gradual change section of bifurcation part of highway tunnel |
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| CN202011481157.2A CN112610221B (en) | 2020-12-15 | 2020-12-15 | Construction method for oversized cross section and gradual change section of bifurcation part of highway tunnel |
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| CN112610221B CN112610221B (en) | 2022-11-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431588A (en) * | 2021-07-30 | 2021-09-24 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
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| CN112610221B (en) | 2022-11-15 |
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