CN111764924B - Construction method for excavating and supporting existing tunnel passing through skew at bottom - Google Patents
Construction method for excavating and supporting existing tunnel passing through skew at bottom Download PDFInfo
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- CN111764924B CN111764924B CN202010607366.0A CN202010607366A CN111764924B CN 111764924 B CN111764924 B CN 111764924B CN 202010607366 A CN202010607366 A CN 202010607366A CN 111764924 B CN111764924 B CN 111764924B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention discloses a construction method for excavating and supporting an existing tunnel with an oblique crossing at the bottom, which is applied to the construction of excavating and supporting in an oblique crossing section generated by constructing the tunnel and the existing tunnel; according to different stresses of the tunnel under construction, the diagonal section generated between the tunnel under construction and the existing tunnel is divided into the excavation sections, one of the excavation sections is selected as a test section, and excavation supporting work is gradually carried out on the test section in a segmented and graded manner, so that different construction methods can be adopted for each section more specifically, and the construction safety is improved.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method of an existing tunnel excavation support with an underpass oblique crossing.
Background
The urban subway operation tunnel lines are generally distributed in a network shape, so that the situation that the lines are crossed with each other is inevitable, and a large number of situations that the proposed tunnel penetrates through the existing operation tunnel exist in the construction process of a new subway line. The excavation construction of the underpass tunnel has obvious disturbance influence on the existing operation tunnel, the problems of settlement of the existing operation tunnel, deformation and cracking of a lining structure, ballast bed void and the like are often caused, especially when the planned tunnel obliquely underpass the existing operation tunnel at a minimum clear distance, the obvious torsion effect of the existing operation tunnel can be caused, the uneven deformation is generated on the axial line section of the vertical operation tunnel, the settlement deformation of one side of the existing operation tunnel, which is close to the planned tunnel, is larger, the settlement deformation of the other side of the existing operation tunnel is smaller, and the tunnel structure is likely to be subjected to torsion damage.
Disclosure of Invention
The invention aims to provide a construction method for excavating and supporting an existing tunnel with an oblique crossing at the bottom, and aims to solve the technical problem of tunnel structure damage caused by excavating and supporting construction in an oblique crossing section generated by constructing the tunnel and the existing tunnel in the prior art.
The invention is realized by the following technical scheme:
a construction method for excavating and supporting an existing tunnel with an oblique crossing at the bottom is applied to excavating and supporting construction in an oblique crossing section generated by constructing the tunnel and the existing tunnel;
the in-building tunnel comprises a right line A tunnel and a left line B tunnel, the existing tunnel comprises a C tunnel and a D tunnel, a first intersection point is generated when the right line A tunnel is intersected with the C tunnel, a second intersection point is generated when the right line A tunnel is intersected with the D tunnel, a third intersection point is generated when the left line B tunnel is intersected with the C tunnel, a fourth intersection point is generated when the left line B tunnel is intersected with the D tunnel, the right line A tunnel comprises a first boundary point and a second boundary point, and the left line B tunnel comprises a third boundary point and a fourth boundary point;
the first boundary point and the first intersection point form a first excavation section, the first intersection point and the second intersection point form a second excavation section, and the second intersection point and the second boundary point form a third excavation section;
the third dividing point and the third intersection point form a fourth excavation section, the third intersection point and the fourth intersection point form a fifth excavation section, and the fourth intersection point and the fourth dividing point form a sixth excavation section;
the concrete excavation steps are as follows:
s1: selecting a test section: selecting the first excavation section as a test section according to the excavation direction of the tunnel under construction;
s2: excavation of a test section: gradually excavating the test section in sections and times; if the excavation result of the first test section is stable, the following steps are continuously executed:
and (4) completing all excavation supporting work of the diagonal section by using the remaining second excavation section, the remaining third excavation section, the remaining fourth excavation section, the remaining fifth excavation section and the remaining sixth excavation section according to the excavation supporting principle that the right line is excavated firstly, the left line is excavated later and the left line and the right line are staggered.
According to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the excavation sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
The scheme also adopts the test section, whether the excavation supporting work of the subsequent oblique crossing section is carried out can be judged according to the dismantling result of the test section, meanwhile, an inapplicable construction method can be quickly found, the working efficiency can be effectively saved, and the construction safety is improved.
Further, the test section excavation supporting step of the step S2 is as follows:
1) dividing the test section into a test section right below the existing tunnel and a test section obliquely below the existing tunnel;
2) excavating the test section obliquely below the existing tunnel by adopting an OC method, and performing the next excavation step when the second lining construction is finished and the strength reaches 80%;
3) and (3) excavating construction of the test section under the existing tunnel by adopting a step method, constructing by adopting the step method, and dividing the construction into an upper step and a lower step for respectively excavating and supporting construction.
This scheme still adopts and divide into two kinds with the test segment, and the excavation mode of two kinds of test segments is different, can be according to the different more effectual construction scheme of making of atress, can improve efficiency of construction and construction safety nature.
Furthermore, when the step method is adopted for construction from top to bottom, the steps are set to be inclined at a ratio of 1: 0.5-0.7 according to the soil layer stability;
when the upper step is excavated by 3-5 m, the lower step can be excavated, and the left line and the right line of the interval earth excavation face surfaces are always kept at a safe distance of not less than 15 m.
And further, arranging a wedge-shaped pressure reduction groove at the top of the lower step, primarily spraying concrete on the excavated tunnel face according to the soil layer stability condition, and erecting a steel bar grating after the concrete strength reaches the specified strength.
Furthermore, a single root with the length of 2.0m and the diameter is arranged on the soil body of the tunnel face
@10X 1.0m advanced small catheter, externally hung single layer
@200 x 200mm steel bar grating sprays 50mm concrete shutoff layer to in time pressure injection 1 after spraying concrete reaches design strength: 1 cement slurry.
Furthermore, the upper step of the interval tunnel mainly adopts a manual and pneumatic pick earth excavation mode.
Further, the shutdown exposure time of the excavation face of the tunnel earth of the interval tunnel must not continuously exceed 12 hours.
Further, selecting the first excavation section as a test section, and excavating and supporting the test section; selecting a fourth excavation section as a second test section, excavating and supporting the second test section, selecting the second excavation section as a third test section, excavating and supporting the third test section, selecting a fifth excavation section as a fourth test section, excavating and supporting the fourth test section, selecting the third excavation section as a fifth test section, excavating and supporting the fifth test section, and finally selecting a sixth excavation section (36) as a sixth test section, excavating and supporting the sixth test section;
and the excavation supporting method of the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the excavation supporting method of the test sections.
Further, the angle of the skew between the built tunnel and the existing tunnel is less than 45 degrees.
When the oblique crossing angle of the oblique crossing section generated by the tunnel and the existing tunnel is smaller than 45 degrees, the pressure values born by the tunnel and the existing tunnel are analyzed by the inventor, and when the oblique crossing angle is smaller than 45 degrees, the safety of the dismantling work can be well improved.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the excavation sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
2. The scheme also adopts the test section, whether the excavation supporting work of the subsequent oblique crossing section is carried out can be judged according to the dismantling result of the test section, meanwhile, an inapplicable construction method can be quickly found, the working efficiency can be effectively saved, and the construction safety is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a cross section structure according to the present invention.
Reference numbers and corresponding part names:
11-a first demarcation point; 12-a second demarcation point; 13-third demarcation point; 14-fourth demarcation point; 21-a first intersection; 22-a second intersection; 23-a third intersection; 24-a fourth intersection; 31-test section; 311-an existing tunnel test section at the oblique lower part; 312-test section directly under existing tunnel; 32-a second excavation section; 33-a third excavated section; 34-a fourth excavation section; 35-a fifth excavation section; 35-sixth excavation section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
[ examples ] A method for producing a compound
As shown in fig. 1, a construction method for excavating and supporting an existing tunnel by crossing obliquely downwards is applied to excavating and supporting construction in an oblique crossing section generated by constructing the tunnel and the existing tunnel;
the method comprises the following steps that the established tunnels comprise a right line A tunnel and a left line B tunnel, the existing tunnels comprise a C tunnel and a D tunnel, a first intersection 21 is generated when the right line A tunnel is intersected with the C tunnel, a second intersection 22 is generated when the right line A tunnel is intersected with the D tunnel, a third intersection 23 is generated when the left line B tunnel is intersected with the C tunnel, a fourth intersection 24 is generated when the left line B tunnel is intersected with the D tunnel, the right line A tunnel comprises a first demarcation point 11 and a second demarcation point 12, and the left line B tunnel comprises a third demarcation point 13 and a fourth demarcation point 14;
the first dividing point 11 and the first intersection point 21 form a first excavation section 31, the first intersection point 21 and the second intersection point 22 form a second excavation section 32, and the second intersection point 22 and the second dividing point 12 form a third excavation section 33;
the third dividing point 13 and the third intersection 23 form a fourth excavated segment 34, the third intersection 23 and the fourth intersection 24 form a fifth excavated segment 35, and the fourth intersection 24 and the fourth intersection 14 form a sixth excavated segment 36;
the concrete excavation steps are as follows:
s1: selecting a test section: selecting a first excavation section 31 as a test section according to the excavation direction of the tunnel under construction;
s2: excavation of a test section: excavating the test section step by step in a sectional and graded manner; if the excavation result of the first test section is stable, the following steps are continuously executed:
and (3) completing all excavation supporting work of the diagonal section by using the remaining second excavation section 32, the third excavation section 33, the fourth excavation section 34, the fifth excavation section 35 and the sixth excavation section 36 according to an excavation supporting principle that the right line is excavated firstly, the left line is excavated later and the left line and the right line are staggered.
According to the scheme, the oblique crossing sections generated between the tunnel under construction and the existing tunnel are divided into the excavation sections according to different stresses of the tunnel under construction, so that different construction methods can be adopted for the sections more pertinently, and the construction safety is improved.
The scheme also adopts the test section, whether the excavation supporting work of the subsequent oblique crossing section is carried out can be judged according to the dismantling result of the test section, meanwhile, an inapplicable construction method can be quickly found, the working efficiency can be effectively saved, and the construction safety is improved.
Further, the test section excavation supporting step of the step S2 is as follows:
1) dividing the test section into a test section 312 under the existing tunnel and a test section 311 under the existing tunnel in an inclined manner;
2) excavating and constructing the test section 311 at the obliquely lower part of the existing tunnel by adopting an OC method, and performing the next excavation step when the second lining construction is finished and the strength reaches 80%;
3) the excavation construction of the test section 312 under the existing tunnel is carried out by adopting a step method, the construction is carried out by adopting the step method, and the excavation supporting construction is divided into an upper step and a lower step.
This scheme still adopts and divide into two kinds with the test segment, and the excavation mode of two kinds of test segments is different, can be according to the different more effectual construction scheme of making of atress, can improve efficiency of construction and construction safety nature.
Furthermore, when the step method is adopted for construction from top to bottom, the steps are set to be inclined at a ratio of 1: 0.5-0.7 according to the soil layer stability;
when the upper step is excavated by 3-5 m, the lower step can be excavated, and the left line and the right line of the interval earth excavation face surfaces are always kept at a safe distance of not less than 15 m.
And further, arranging a wedge-shaped pressure reduction groove at the top of the lower step, primarily spraying concrete on the excavated tunnel face according to the soil layer stability condition, and erecting a steel bar grating after the concrete strength reaches the specified strength.
Furthermore, a single root with the length of 2.0m and the diameter is arranged on the soil body of the tunnel face
@1.0 x 1.0m advanced small catheter with single layer externally hung
@200 x 200mm steel bar grating sprays 50mm concrete shutoff layer to in time pressure injection 1 after spraying concrete reaches design strength: 1 cement slurry.
Furthermore, the upper step of the interval tunnel mainly adopts a manual and pneumatic pick earth excavation mode.
Further, the shutdown exposure time of the excavation face of the tunnel earth of the interval tunnel must not continuously exceed 12 hours.
Further, the first excavation section 31 is selected as a test section, and excavation and support are carried out on the test section; selecting a fourth excavation section 34 as a second test section, excavating and supporting the second test section, selecting a second excavation section 32 as a third test section, excavating and supporting the third test section, selecting a fifth excavation section 35 as a fourth test section, excavating and supporting the fourth test section, selecting a third excavation section 33 as a fifth test section, excavating and supporting the fifth test section, and finally selecting a sixth excavation section 36 as a sixth test section, excavating and supporting the sixth test section;
the excavation supporting method of the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the excavation supporting method of the test sections.
Further, the angle of the skew between the built tunnel and the existing tunnel is less than 45 degrees.
When the oblique crossing angle of the oblique crossing section generated by the tunnel and the existing tunnel is smaller than 45 degrees, the pressure values born by the tunnel and the existing tunnel are analyzed by the inventor, and when the oblique crossing angle is smaller than 45 degrees, the safety of the dismantling work can be well improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A construction method for excavating and supporting an existing tunnel with an oblique crossing at the bottom is applied to excavating and supporting construction in an oblique crossing section generated by constructing the tunnel and the existing tunnel;
characterized in that the in-progress tunnel comprises a right-line A tunnel and a left-line B tunnel, the existing tunnel comprises a C tunnel and a D tunnel, the right-line A tunnel and the C tunnel intersect to generate a first intersection (21), the right-line A tunnel and the D tunnel intersect to generate a second intersection (22), the left-line B tunnel and the C tunnel intersect to generate a third intersection (23), the left-line B tunnel and the D tunnel intersect to generate a fourth intersection (24), the right-line A tunnel comprises a first demarcation point (11) and a second demarcation point (12), and the left-line B tunnel comprises a third demarcation point (13) and a fourth demarcation point (14);
the first demarcation point (11) and the first intersection point (21) form a first excavated segment (31), the first intersection point (21) and the second intersection point (22) form a second excavated segment (32), and the second intersection point (22) and the second demarcation point (12) form a third excavated segment (33);
-the third and third intersection points (13, 23) constitute a fourth excavated segment (34), -the third and fourth intersection points (23, 24) constitute a fifth excavated segment (35), -the fourth intersection point (24) and the fourth intersection point (14) constitute a sixth excavated segment (36);
the concrete excavation steps are as follows:
s1: selecting a test section: selecting the first excavation section (31) as a test section according to the excavation direction of the tunnel to be built;
s2: excavation of a test section: gradually excavating the test section in sections and times; if the excavation result of the test section is stable, the following steps are continuously executed:
and (3) completing all excavation supporting work of the diagonal section by using the remaining second excavation section (32), the third excavation section (33), the fourth excavation section (34), the fifth excavation section (35) and the sixth excavation section (36) according to an excavation supporting principle that the right line is excavated first, the left line is excavated later and the left line and the right line are staggered.
2. The construction method of the existing tunnel excavation support of the underpass skew cross, according to claim 1, wherein the test section excavation support of the step S2 is as follows:
1) dividing the test section into a test section (312) under the existing tunnel and a test section (311) obliquely under the existing tunnel;
2) excavating and constructing the test section (311) obliquely below the existing tunnel by adopting an OC method, and performing the next excavation step when the second lining construction is finished and the strength reaches 80%;
3) and (3) excavating construction of the test section (312) under the existing tunnel by adopting a step method, constructing by adopting the step method, and respectively excavating and supporting construction by dividing the test section into an upper step and a lower step.
3. The construction method for excavating and supporting the existing tunnel passing through the oblique crossing tunnel as claimed in claim 2, wherein when the step method is adopted for construction from top to bottom, the steps are put on the slope according to the soil layer stability condition in a ratio of 1: 0.5-1: 0.7;
when the upper step is excavated by 3-5 m, the lower step can be excavated, and the left line and the right line of the interval earth excavation face surfaces are always kept at a safe distance of not less than 15 m.
4. The construction method of the existing tunnel excavation support of the underpass skew angle as claimed in claim 3, wherein a wedge-shaped pressure reduction groove is arranged at the top of the lower step, the excavation face is subjected to primary concrete spraying according to soil layer stability conditions, and a steel bar grating is erected after the concrete strength reaches the specified strength.
5. The construction method of the existing tunnel excavation support of the underpass oblique crossing is characterized in that a single small guide pipe with the length of 2.0m and the diameter of phi 25@1.0 x 1.0m in advance is arranged on a soil body of a tunnel face, a single-layer phi 6@200 x 200mm steel bar grating is externally hung, a 50mm concrete plugging layer is sprayed, and after the sprayed concrete reaches the designed strength, 1: 1 cement slurry.
6. The construction method for excavating and supporting the existing tunnel with the cross-cut downwards according to the claim 3, wherein the upper step of the interval tunnel mainly adopts a manual and pneumatic pick earth excavation mode.
7. The method of constructing an existing tunnel excavation support of a cross-cut underpass as claimed in claim 3, wherein the interval tunnel earthwork excavation face downtime exposure time is not continuously more than 12 hours.
8. The construction method of an existing tunnel excavation support of an underpass skew cross, according to claim 1, characterized in that the first excavation section (31) is selected as a test section, and after the test section is excavated; selecting a fourth excavation section (34) as a second test section, excavating and supporting the second test section, selecting a second excavation section (32) as a third test section, excavating and supporting the third test section, selecting a fifth excavation section (35) as a fourth test section, excavating and supporting the fourth test section, selecting a third excavation section (33) as a fifth test section, excavating and supporting the fifth test section, and finally selecting a sixth excavation section (36) as a sixth test section and excavating and supporting the sixth test section;
and the excavation supporting method of the second test section, the third test section, the fourth test section, the fifth test section and the sixth test section adopts the excavation supporting method of the test sections.
9. The method for constructing the excavation support of the existing tunnel passing through the inclined cross, according to claim 1, wherein the angle of the inclined cross between the tunnel under construction and the existing tunnel is less than 45 degrees.
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| US6554368B2 (en) * | 2000-03-13 | 2003-04-29 | Oil Sands Underground Mining, Inc. | Method and system for mining hydrocarbon-containing materials |
| JP4045479B2 (en) * | 2001-11-07 | 2008-02-13 | 清水建設株式会社 | Shield tunnel method |
| CN101215969A (en) * | 2008-01-17 | 2008-07-09 | 上海交通大学 | Large diameter tunneling close range down-traversing small diameter subway tunnel distortion control method |
| CN103195435B (en) * | 2013-03-22 | 2015-04-08 | 同济大学 | Method for preventing shield penetration of building compact district from inducing ground subsidence |
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