CN111779489A - Large-section tunnel construction method for ^ C-shaped section civil air defense section - Google Patents
Large-section tunnel construction method for ^ C-shaped section civil air defense section Download PDFInfo
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- CN111779489A CN111779489A CN202010657576.0A CN202010657576A CN111779489A CN 111779489 A CN111779489 A CN 111779489A CN 202010657576 A CN202010657576 A CN 202010657576A CN 111779489 A CN111779489 A CN 111779489A
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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
- E21D9/03—Driving non-circular tunnels
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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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a construction method of a large-section tunnel of a +. C-shaped section civil air defense section, which comprises the following steps: firstly, digging a ^ shaped hole; and excavating the C-shaped hole after pouring of the two liners of the ^ shaped hole is completed. The construction method has large internal space after excavation, and can meet the requirements of facilities such as a lower jet fan, a civil air defense section and the like; the two holes share the primary support middle partition wall and the secondary lining middle partition wall, and are suitable for transition sections such as line adjustment and slope adjustment; the problem that the available space of the tunnel is too small when the tunnel passes through a risk source can be effectively solved; the process reason of firstly constructing the ^ shaped hole two lining and then excavating the C-shaped hole is adopted, the stratum settlement caused by the construction of the big hole can be used for estimating the stratum settlement caused by the construction of the small hole, and the reinforcement measures can be taken in advance by researching and judging the settlement trend in advance to avoid causing overlarge stratum settlement; by adopting the construction method of first big hole and then small hole, the total construction period can be effectively reduced by changing the construction flow rhythm.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a large-section tunnel construction method.
Background
An asymmetric double-arch tunnel or a CRD tunnel is generally adopted for a large-section tunnel in VI-level surrounding rock geology, and is shown in an attached figure 1.
The construction method of the asymmetric double-arch tunnel is that a small hole is constructed firstly and then a large hole is constructed, and the construction method of the CRD tunnel is that 4 chambers are constructed in blocks in sequence, but the two construction methods have the following technical defects:
1. the civil air defense section needs to be provided with symmetrical sections at the same mileage of the protection unit so as to meet the facility safety requirements of the underground air defense tunnel. The construction method of the asymmetric double-arch tunnel can only arrange a civil air defense facility in a big hole, has insufficient space of a small hole and can not meet the requirement of double-line arrangement.
2. The asymmetrical double-arch tunnel construction method requires that a small hole is firstly excavated and then a large hole is excavated, the ground surface settlement caused in the small hole excavation process is insufficient to represent the ground surface settlement in the large hole construction process, and the small hole settlement data cannot be used for estimating the large hole settlement data, so that the ground surface settlement prejudgment control is extremely unfavorable.
3. The asymmetric double-arch tunnel adopts a construction method of constructing small holes first and then constructing large holes, and the condition of overlong whole construction period is easy to occur after the large hole engineering arrangement of a key line of the construction period is dragged.
4. The CRD method tunnel has large line spacing and cannot meet the requirement of the double-arch tunnel on the closer line spacing.
Based on the above, a large-section tunnel construction method of [ ° C ] section civil air defense section is needed to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a construction method of a large-section tunnel of a ^ C-shaped section civil air defense section, which can solve the technical problems that the requirement of double-line arrangement cannot be met, the whole construction period is easy to be overlong, and the requirement of a double-arch tunnel on the distance between close lines cannot be met in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a construction method of a large-section tunnel of a ^ C-shaped section civil air defense section comprises the following steps:
1) firstly, digging a ^ shaped hole;
2) and excavating the C-shaped hole after pouring of the two liners of the ^ shaped hole is completed.
Further, the specific steps of step 1) are as follows:
1.1) constructing a first hole;
1.2) constructing a second hole, wherein the second hole is positioned at the bottom of the first hole;
1.3) constructing a third hole, wherein the third hole is positioned at the right side of the first hole;
1.4) constructing a fourth hole, wherein the fourth hole is positioned at the right side of the second hole, and the fourth hole is positioned at the bottom of the third hole;
1.5) penetrating the first hole, the second hole, the third hole and the fourth hole to complete ^ shaped hole excavation.
Further, the digging progress of the first hole is 4-6m ahead of the digging progress of the second hole.
Further, the excavation progress of the second hole is 8-10m ahead of the excavation progress of the third hole.
Further, the excavation progress of the third hole is 4-6m ahead of that of the fourth hole.
Further, the first hole constructing step of step 1.1) includes: grouting deep holes in the arch part to reinforce the stratum; and excavating the soil body of the first hole by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch.
Further, the second hole constructing step of step 1.2) includes: and excavating the soil body of the second hole by a step method, and constructing a temporary partition wall and a temporary inverted arch.
Further, the third hole constructing step of step 1.3) includes: grouting deep holes in the arch part to reinforce the stratum; and excavating the soil body of the third hole by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch.
Further, the step 1.4) of constructing the fourth hole includes: and excavating the soil body of the fourth hole by a step method, and constructing the soil body as a primary support.
Further, the step 1.5) comprises the following specific steps:
1.5.1) cutting off the lower half part of the middle partition wall in a subsection mode (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer, pouring inverted arch concrete, and removing the residual temporary partition wall and the temporary inverted arch after the inverted arch reaches the design strength;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch with a shaped ^ shaped tunnel at the left line; building a brick mould between the temporary intermediate wall and the second lining for pouring concrete, wherein the erected full red frame comprises the |' shaped hole;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated.
Further, the specific steps of step 2) are as follows:
2.1) constructing a first hole; the first hole is adjacent to the ++' shaped third hole;
2.2) constructing a second hole; the second hole is positioned at the bottom of the first hole;
2.3) penetrating the first hole and the second hole to finish C-shaped hole excavation.
Further, the digging progress of the first hole is 4-6m ahead of the digging progress of the second hole.
Further, the step of constructing the ith hole in the step 2.1) comprises the following steps: and performing primary support and temporary inverted arch of the arch part of the first tunnel by an annular excavation and core soil reserving method, and drilling a locking anchor pipe.
Further, the step II of the step 2.2) comprises the following steps: and excavating the soil body of the first hole by a step method, and constructing a primary support.
Further, the step 2.3) comprises the following steps:
2.3.1) removing the primary inverted arch support in sections (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer and pouring inverted arch concrete;
2.3.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a side wall and a top arch of the right-line C-shaped tunnel;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
Preferably, the construction method of the large-section tunnel of the [ ° C ] shaped interval civil air defense section comprises the following steps:
1) firstly, digging ^ shaped holes, which comprises the following steps:
1.1) forming a first hole, comprising the steps of: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the first hole by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch;
1.2) forming a second hole, comprising the steps of: excavating the soil body of the second hole by a step method, and constructing a temporary partition wall and a temporary inverted arch; the second hole is positioned at the bottom of the first hole; the digging progress of the first hole is 4-6m ahead of the digging progress of the second hole;
1.3) constructing a third hole, comprising the following steps: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the third hole by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch; the third hole is positioned on the right side of the first hole; the digging progress of the second hole is 8-10m ahead of the digging progress of the third hole;
1.4) constructing a fourth hole, comprising the following steps: excavating the soil body of the fourth hole by a step method, and constructing a primary support; the fourth hole is positioned on the right side of the second hole; the fourth hole is positioned at the bottom of the third hole; the excavation progress of the third hole is 4-6m ahead of that of the fourth hole;
1.5) penetrating through the first hole, the second hole, the third hole and the fourth hole to complete the ++' shaped hole excavation, which comprises the following steps:
1.5.1) cutting off the lower half part of the middle partition wall in a subsection mode (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer, pouring inverted arch concrete, and removing the residual temporary partition wall and the temporary inverted arch after the inverted arch reaches the design strength;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch with a shaped ^ shaped tunnel at the left line; building a brick mold between the temporary intermediate wall and the second lining for pouring concrete; the erected full red shelf comprises the ^ shaped hole;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated.
2) After the pouring of the two linings of the ^ shaped hole is finished, excavating the C-shaped hole, and the concrete steps are as follows:
2.1) constructing the I hole, comprising the following steps: performing primary support and temporary inverted arch of the arch part of the first cave by an annular excavation and core soil reserving method, and drilling a locking anchor pipe; the first hole is attached to a third hole in the ++' shaped hole;
2.2) constructing a second hole, comprising the following steps: excavating the soil body of the second hole by a step method, and constructing a primary support; the second hole is positioned at the bottom of the first hole; the excavation progress of the first hole is 4-6m ahead of that of the second hole;
2.3) penetrating through the first hole and the second hole to complete C-shaped hole excavation, and the concrete steps are as follows:
2.3.1) removing the primary inverted arch support in sections (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer and pouring inverted arch concrete;
2.3.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a side wall and a top arch of the right-line C-shaped tunnel;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
The construction method of the large-section tunnel of the ^ C-shaped interval civil air defense section, which is provided by the invention, has the beneficial effects that:
1. the civil air defense section needs to be provided with symmetrical sections at the same mileage of the protection unit so as to meet the facility safety requirements of the underground air defense tunnel. The method has large internal space after excavation, can reach 16 meters wide and 9 meters high, and can meet the requirements of facilities such as a lower jet fan, a civil air defense section and the like;
2. the two holes share the primary support middle partition wall and the secondary lining middle partition wall, so that the line spacing can be effectively reduced to 6.5 meters, and the method is suitable for transition sections such as line adjustment and slope adjustment;
3. due to the reduction of the line spacing, the excavation width is greatly reduced, and the problem that the available space of the tunnel is too small when the tunnel passes through a risk source can be effectively solved;
4. the process reason of firstly constructing the ^ shaped hole two lining and then excavating the C-shaped hole is adopted, the stratum settlement caused by the construction of the big hole can be used for estimating the stratum settlement caused by the construction of the small hole, and the reinforcement measures can be taken in advance by researching and judging the settlement trend in advance to avoid causing overlarge stratum settlement;
5. by adopting the construction method of first big hole and then small hole, the total construction period can be effectively reduced by changing the construction flow rhythm;
6. the section can be used as a widened variable section of the primary common tunnel.
Drawings
Fig. 1 is a schematic structural diagram of ≠ C shape;
fig. 2 is a structural schematic diagram after construction of a first hole in the construction method of a large-section tunnel of a ≠ C-shaped interval civil air defense segment provided by the embodiment of the invention;
fig. 3 is a structural schematic diagram after construction of a second hole in the construction method of a large-section tunnel of a ≠ C-shaped interval civil air defense segment provided by the embodiment of the invention;
fig. 4 is a structural schematic diagram after construction of a third hole in the construction method of a large-section tunnel of a ≠ C-shaped interval civil air defense segment provided by the embodiment of the invention;
fig. 5 is a structural schematic diagram after fourth hole construction in the construction method of a large-section tunnel of a ≠ C-shaped interval civil air defense segment provided by the embodiment of the present invention;
fig. 6 is a structural schematic diagram after construction in step 1.5.1) in the construction method of a large-section tunnel of a civil air defense segment in an ≠ C-shaped interval provided by the embodiment of the invention;
fig. 7 is a structural schematic diagram after construction in step 1.5.2) in the construction method of a large-section tunnel of a civil air defense segment in an ≠ C-shaped interval provided by the embodiment of the invention;
fig. 8 is a structural schematic diagram of a constructed first hole in the construction method of a large-section tunnel of a civil air defense segment in a ≠ C-shaped interval provided by the embodiment of the invention;
fig. 9 is a structural schematic diagram of a second hole after construction in the construction method of a large-section tunnel with a ≠ C-shaped section civil air defense section provided by the embodiment of the present invention;
fig. 10 is a structural schematic diagram after construction in step 2.3.1) in the construction method of a large-section tunnel of a civil air defense segment in an ≠ C-shaped interval provided by the embodiment of the invention;
fig. 11 is a structural schematic diagram after construction in step 2.3.2) in the construction method of the ≠ C-shaped interval civil air defense segment provided by the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example one
A construction method of a large-section tunnel of a ^ C-shaped section civil air defense section comprises the following steps:
1) firstly, digging a ^ shaped hole;
2) and excavating the C-shaped hole after pouring of the two liners of the ^ shaped hole is completed.
The step 1) comprises the following steps:
1.1) constructing a first hole 1; see fig. 2;
1.2) constructing a second hole 2, wherein the second hole 2 is positioned at the bottom of the first hole 1; see fig. 3;
1.3) constructing a third hole 3, wherein the third hole 3 is positioned at the right side of the first hole 1; see fig. 4;
1.4) constructing a fourth hole 4, wherein the fourth hole 4 is positioned at the right side of the second hole 2, and the fourth hole 4 is positioned at the bottom of the third hole 3; see fig. 5;
1.5) the hole penetrates through the first hole 1, the second hole 2, the third hole 3 and the fourth hole 4, and ^ shaped hole digging is completed.
In this embodiment, the digging progress of the first hole 1 is 4-6m ahead of the digging progress of the second hole 2.
The digging progress of the second hole 2 is 8-10m ahead of the digging progress of the third hole 3.
The digging progress of the third hole 3 is 4-6m ahead of the digging progress of the fourth hole 4.
The first hole 1 constructing step of step 1.1) comprises the following steps: grouting deep holes in the arch part to reinforce the stratum; and excavating the soil body of the first hole 1 by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch.
The second hole 2 constructing step of the step 1.2) comprises the following steps: and excavating the soil body of the second hole 2 by a step method, and constructing a temporary partition wall and a temporary inverted arch.
The third hole 3 in the step 1.3) comprises the following steps: grouting deep holes in the arch part to reinforce the stratum; and excavating the soil body of the third hole 3 by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch.
The fourth hole 4 in the step 1.4) comprises the following steps: and excavating the soil body of the fourth hole 4 by a step method, and constructing the soil body as a primary support.
The step 1.5) comprises the following steps:
1.5.1) cutting off the lower half part of the middle partition wall in a subsection mode (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer, pouring 11 concrete of an inverted arch, and removing the residual temporary partition wall and the temporary inverted arch after the inverted arch reaches the design strength; see fig. 6;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch 12 with a left line ^ shaped tunnel. And building a brick mold between the temporary intermediate wall and the secondary lining for pouring concrete. The erected full red shelf comprises the ^ shaped hole; see fig. 7;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated.
The step 2) comprises the following steps:
2.1) constructing an I-shaped hole 5, wherein the I-shaped hole 5 is attached to a third hole 3 in the ^ shaped hole; see fig. 8;
2.2) constructing a second hole 6, wherein the second hole 6 is positioned at the bottom of the first hole 5; see fig. 9;
2.3) penetrating the first hole 5 and the second hole 6 to complete C-shaped hole excavation.
The excavation progress of the first hole 5 is 4-6m ahead of that of the second hole 6.
The I hole 5 constructing step of the step 2.1) comprises the following steps: constructing the 5-arch primary support and the temporary inverted arch of the first tunnel, and drilling a locking anchor pipe.
The step II hole 6 of the step 2.2) comprises the following steps: and excavating the soil body of the second hole 6 by a step method, and constructing a primary support.
The step 2.3) comprises the following steps:
2.3.1) removing primary supports of the inverted arch 21 in sections (determined according to the monitoring condition, the longitudinal length is not more than 6m), laying a waterproof layer and pouring inverted arch concrete; see fig. 10;
2.3.2) constructing full red frames, waterproof layers and secondary lining structures of the side wall and the top arch 22 of the right-line C-shaped tunnel; see fig. 11;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
Example two
A construction method of a large-section tunnel of a ^ C-shaped section civil air defense section comprises the following steps:
1) firstly, excavating ^ shaped holes, comprising:
1.1) making a first hole 1, comprising the steps of: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the first hole 1 by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch; see fig. 2;
1.2) constructing a second hole 2, comprising the steps of: excavating the soil body of the second hole 2 by a step method, and constructing a temporary partition wall and a temporary inverted arch; the second hole 2 is positioned at the bottom of the first hole 1; the digging progress of the first hole 1 is 4-6m ahead of the digging progress of the second hole 2; see fig. 3;
1.3) constructing a third hole 3, comprising the steps of: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the third hole 3 by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch; the third hole 3 is positioned at the right side of the first hole 1; the digging progress of the second hole 2 is 8-10m ahead of the digging progress of the third hole 3; see fig. 4;
1.4) forming a fourth hole 4, wherein the forming step comprises the following steps: excavating the soil body of the fourth hole 4 by a step method, and constructing a primary support; the fourth hole 4 is positioned at the right side of the second hole 2; the fourth hole 4 is positioned at the bottom of the third hole 3; the digging progress of the third hole 3 is 4-6m ahead of the digging progress of the fourth hole 4; see fig. 5;
1.5) the hole 1, the second hole 2, the third hole 3 and the fourth hole 4 are penetrated, and ^ shaped hole digging is completed, which comprises the following steps:
1.5.1) cutting off the lower half part of the middle partition wall in a subsection mode (the longitudinal length is not more than 6m according to the monitoring condition), laying a waterproof layer, pouring 11 concrete of an inverted arch, and removing the residual temporary partition wall and the temporary inverted arch after the inverted arch reaches the design strength; see fig. 6;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch 12 with a left line ^ shaped tunnel. And building a brick mold between the temporary intermediate wall and the secondary lining for pouring concrete. The erected full red shelf comprises the ^ shaped hole; see fig. 7;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated.
2) After the pouring of the ^ C-shaped hole secondary lining is finished, excavating the C-shaped hole, and the method comprises the following steps of:
2.1) constructing the I-th hole 5, wherein the constructing steps comprise: constructing a primary support and a temporary inverted arch of the 5-arch part of the first tunnel, and drilling a locking anchor pipe; the first hole 5 is adjacent to the third hole 3 of the ++ "shaped hole; see fig. 8;
2.2) constructing a second hole 6, comprising the following steps: excavating the soil body of the second hole 6 by a step method, and constructing a primary support; the second hole 6 is positioned at the bottom of the first hole 5; the excavation progress of the first hole 5 is 4-6m ahead of that of the second hole 6; see fig. 9;
2.3) the first hole 5 and the second hole 6 are penetrated to complete C-shaped hole excavation, and the method comprises the following steps:
2.3.1) removing primary supports of the inverted arch 21 in sections (determined according to the monitoring condition, the longitudinal length is not more than 6m), laying a waterproof layer and pouring inverted arch concrete; see fig. 10;
2.3.2) constructing full red frames, waterproof layers and secondary lining structures of the side wall and the top arch 22 of the right-line C-shaped tunnel; see fig. 11;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
The two construction methods of the large-section tunnel with the ^ C-shaped section for the civil air defense section have the beneficial effects that:
1. the civil air defense section needs to be provided with symmetrical sections at the same mileage of the protection unit so as to meet the facility safety requirements of the underground air defense tunnel. The method has large internal space after excavation, can reach 16 meters wide and 9 meters high, and can meet the requirements of facilities such as a lower jet fan, a civil air defense section and the like;
2. the two holes share the primary support middle partition wall and the secondary lining middle partition wall, so that the line spacing can be effectively reduced to 6.5 meters, and the method is suitable for transition sections such as line adjustment and slope adjustment;
3. due to the reduction of the line spacing, the excavation width is greatly reduced, and the problem that the available space of the tunnel is too small when the tunnel passes through a risk source can be effectively solved;
4. the process reason of firstly constructing the ^ shaped hole two lining and then excavating the C-shaped hole is adopted, the stratum settlement caused by the construction of the big hole can be used for estimating the stratum settlement caused by the construction of the small hole, and the reinforcement measures can be taken in advance by researching and judging the settlement trend in advance to avoid causing overlarge stratum settlement;
5. by adopting the construction method of first big hole and then small hole, the total construction period can be effectively reduced by changing the construction flow rhythm;
6. the section can be used as a widened variable section of the primary common tunnel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A construction method of a large-section tunnel of a ^ C-shaped section civil air defense section is characterized by comprising the following steps:
1) firstly, digging a ^ shaped hole;
2) and excavating the C-shaped hole after pouring of the two liners of the ^ shaped hole is completed.
2. The construction method of the large-section tunnel of the +. C-shaped interval civil air defense segment according to claim 1, is characterized in that the specific steps of the step 1) are as follows:
1.1) constructing a first hole (1);
1.2) constructing a second hole (2), wherein the second hole (2) is positioned at the bottom of the first hole (1);
1.3) constructing a third hole (3), wherein the third hole (3) is positioned at the right side of the first hole (1);
1.4) constructing a fourth hole (4), wherein the fourth hole (4) is positioned at the right side of the second hole (2) and at the bottom of the third hole (3);
1.5) the hole penetrates through the first hole (1), the second hole (2), the third hole (3) and the fourth hole (4), and ^ shaped hole excavation is completed.
3. The construction method of the large-section tunnel of the +. +. C-shaped interval civil air defense section according to claim 2, characterized in that the first hole (1) of the step 1.1) is constructed by the following steps: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the first hole (1) by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch;
the second hole (2) of step 1.2) is implemented by the following steps: excavating the soil body of the second hole (2) by a step method, and constructing a temporary partition wall and a temporary inverted arch;
the third hole (3) of the step 1.3) is implemented by the following steps: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the third hole (3) by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch;
the fourth hole (4) in the step 1.4) is implemented by the following steps: and excavating the soil body of the fourth hole (4) by a step method, and constructing the soil body for primary support.
4. The construction method of the large-section tunnel of the +. +. C-shaped interval civil air defense section according to claim 2, characterized in that the step 1.5) comprises the following specific steps:
1.5.1) cutting off the lower half part of the middle partition wall in sections, paving a waterproof layer, pouring inverted arch concrete, and removing the residual temporary partition wall and the temporary inverted arch after the inverted arch (11) reaches the design strength;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch (12) with a left line ^ shaped tunnel; building a brick mould between the temporary intermediate wall and the second lining for pouring concrete, wherein the erected full red frame comprises the |' shaped hole;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated.
5. The construction method of the large-section tunnel of the +. +. C-shaped interval civil air defense section according to claim 2, characterized in that the excavation progress of the first hole (1) is 4-6m ahead of the excavation progress of the second hole (2);
the digging progress of the second hole (2) is 8-10m ahead of the digging progress of the third hole (3);
the digging progress of the third hole (3) is 4-6m ahead of the digging progress of the fourth hole (4).
6. The construction method of the large-section tunnel of the +. C-shaped interval civil air defense segment according to claim 1, characterized in that the specific steps of the step 2) are as follows:
2.1) constructing an I-shaped hole (5), wherein the I-shaped hole (5) is adjacent to a third hole (3) in the ^ shaped hole;
2.2) constructing a second hole (6), wherein the second hole (6) is positioned at the bottom of the first hole (5);
2.3) the first hole (5) and the second hole (6) are penetrated, and C-shaped hole excavation is completed.
7. The construction method of the large-section tunnel of the +. +. C-shaped interval civil air defense section according to claim 6, characterized in that the step of constructing the I hole (5) of the step 2.1) comprises the following steps: performing primary support and temporary inverted arch of the arch part of the first tunnel (5) by an annular excavation and core soil reserving method, and drilling a locking anchor pipe;
the second hole (6) of the step 2.2) comprises the following steps: and excavating the soil body of the second hole (6) by a step method, and constructing an initial support.
8. The construction method of the large-section tunnel of the +. +. C-shaped interval civil air defense section according to claim 6, wherein the step 2.3) comprises the following specific steps:
2.3.1) dismantling the primary support of the inverted arch (21) in sections, paving a waterproof layer and pouring inverted arch concrete;
2.3.2) constructing full red frames, waterproof layers and secondary lining structures of the side wall and the top arch (22) of the right-line C-shaped tunnel;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
9. The construction method of the large-section tunnel of the +. plucking-C-shaped interval civil air defense section according to claim 6, characterized in that the excavation progress of the first hole (5) is 4-6m ahead of the excavation progress of the second hole (6).
10. The construction method of the large-section tunnel of the +. C-shaped interval civil air defense section according to claim 1, is characterized by comprising the following steps:
1) firstly, digging ^ shaped holes, which comprises the following steps:
1.1) making a first hole (1) comprising the steps of: grouting deep holes in the arch part to reinforce the stratum; excavating the soil body of the first hole (1) by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch;
1.2) constructing a second hole (2), wherein the steps comprise excavating soil body of the second hole (2) by a step method, and constructing a temporary partition wall and a temporary inverted arch; the second hole (2) is positioned at the bottom of the first hole (1); the digging progress of the first hole (1) is 4-6m ahead of the digging progress of the second hole (2);
1.3) constructing a third hole (3), wherein the steps comprise arch deep hole grouting and stratum reinforcing; excavating the soil body of the third hole (3) by an annular excavation and core soil reserving method, and constructing an arch part support, a temporary partition wall and a temporary inverted arch; the third hole (3) is positioned at the right side of the first hole (1); the digging progress of the second hole (2) is 8-10m ahead of the digging progress of the third hole (3);
1.4) making a fourth hole (4), comprising the steps of: excavating the soil body of the fourth hole (4) by a step method, and constructing a primary support; the fourth hole (4) is positioned at the right side of the second hole (2) and at the bottom of the third hole (3); the digging progress of the third hole (3) is 4-6m ahead of the digging progress of the fourth hole (4);
1.5) the hole (1) penetrates through the first hole (1), the second hole (2), the third hole (3) and the fourth hole (4), and ^ shaped hole digging is completed, and the method comprises the following steps:
1.5.1) cutting off the lower half part of the middle partition wall in sections, paving a waterproof layer, pouring concrete of an inverted arch (11), and removing the residual temporary partition wall and the residual temporary inverted arch after the inverted arch reaches the design strength;
1.5.2) constructing a full red frame, a waterproof layer and a secondary lining structure of a tunnel side wall and a top arch (12) with a left line ^ shaped tunnel; building a brick mold between the temporary intermediate wall and the second lining for pouring concrete; the erected full red shelf comprises the ^ shaped hole;
1.5.3) after the concrete reaches the design strength, removing the full red bracket, and grouting after secondary backing;
1.5.4) after the concrete reaches the designed strength, the next section of operation is carried out, and the steps 1.5.1) to 1.5.3) are repeated;
2) after the pouring of the two linings of the ^ shaped hole is finished, excavating the C-shaped hole, and the concrete steps are as follows:
2.1) constructing the I-th hole (5) by the steps of: performing primary support and temporary inverted arch of the arch part of the first tunnel (5) by an annular excavation and core soil reserving method, and drilling a locking anchor pipe; the I hole (5) is attached to a third hole (3) in the ++' shaped hole;
2.2) constructing a second hole (6) comprising the steps of: excavating the soil body of the second hole (6) by a step method, and constructing a primary support; the second hole (6) is positioned at the bottom of the first hole (5); the excavation progress of the first hole (5) is 4-6m ahead of that of the second hole (6);
2.3) the first hole (5) and the second hole (6) are penetrated to complete the C-shaped hole excavation, and the concrete steps are as follows:
2.3.1) dismantling primary supports of the inverted arches in sections, paving a waterproof layer, and pouring concrete of the inverted arches (21);
2.3.2) constructing full red frames, waterproof layers and secondary lining structures of the side wall and the top arch (22) of the right-line C-shaped tunnel;
2.3.3) after the concrete reaches the design strength, removing the full red support, and grouting after secondary backing;
2.3.4) the next stage of operation is carried out, repeating steps 2.3.1) to 2.3.3).
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