CN118292893A - Existing shield tunnel expanding and excavating construction method - Google Patents
Existing shield tunnel expanding and excavating construction method Download PDFInfo
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- CN118292893A CN118292893A CN202410563811.6A CN202410563811A CN118292893A CN 118292893 A CN118292893 A CN 118292893A CN 202410563811 A CN202410563811 A CN 202410563811A CN 118292893 A CN118292893 A CN 118292893A
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- 238000010276 construction Methods 0.000 title claims abstract description 168
- 238000009412 basement excavation Methods 0.000 claims abstract description 114
- 239000010959 steel Substances 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 26
- 239000004567 concrete Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims 2
- 239000007924 injection Substances 0.000 claims 2
- 238000004891 communication Methods 0.000 description 8
- 239000002689 soil Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel construction, in particular to an existing shield tunnel expanding construction method, which comprises the steps of removing one ring segment ring of a preset construction area to form a current construction area, excavating a first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width, completing primary support construction, excavating a second excavation area to a preset depth in a direction away from the central axis according to the preset width, completing primary support construction, continuing removing one ring segment ring, repeatedly executing the steps of excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to the preset width, completing primary support construction until the excavation construction of the preset construction area is completed, and forming an expanding excavation section.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to an existing shield tunnel expanding and excavating construction method.
Background
The shield method is a method for constructing a tunnel, and is suitable for constructing a soft soil stratum or a stratum with high water content to tunnel. The shield (shield) is a protective structure of a heading machine for protecting stratum stability, and is made of concrete, cast iron or steel. The shield actually provides temporary support for the heading machine during operation. Construction by a full-section Tunnel Boring Machine (TBM) is called a full-section tunnel boring method, and English method combined with two countries are historically constructed to form English method strait tunnels, and the method belongs to the method for crossing English strait sea beds.
The shield method refers to a construction method for performing operations such as tunnel excavation and lining by using a shield. A construction method for tunneling tunnels in soft foundations or broken rock formations by using a shield. The shield is a special equipment with a shield, which uses the lining blocks with the tail parts already installed as supporting points to advance, uses a cutter disc to cut soil body, and simultaneously discharges soil and assembles the following precast concrete lining blocks.
In the related art, after the shield tunnel is formed, a communication channel is properly arranged in the section according to the whole section length of the shield tunnel so as to realize the communication of two shield tunnels in the same section, however, when the communication channel is constructed in the prior art, because the construction position of the communication channel possibly has strong development condition of cracks due to existence of a geological body, when the condition occurs, the construction of the communication channel is difficult, and the construction safety is affected.
Disclosure of Invention
The invention mainly aims to provide an existing shield tunnel expansion and excavation construction method, and aims to solve the technical problems that in the related art, a communication channel is difficult to construct and construction safety is affected due to the strong development condition of a ground crack.
In order to achieve the above object, in a first aspect, the present invention provides an existing shield tunnel expanding and excavating construction method, which includes the following steps:
Removing one ring of segment rings of the preset construction area to form a current construction area; the current construction area comprises a first excavation area and a second excavation area arranged below the first excavation area;
Excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width, and completing primary support construction; the preset width is smaller than or equal to the extension length of the current construction area along the length direction of the existing shield tunnel;
Excavating the second excavation area to the preset depth in the direction away from the central axis according to the preset width, and completing primary support construction;
And continuously removing a ring of the duct piece ring, repeatedly executing the steps of excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to the preset width, and completing primary support construction until the excavation construction of the preset construction area is completed, so as to form an expanded excavation section.
Optionally, the step of removing one of the ring segment rings of the preset construction area to form the current construction area includes:
and removing the top sealing block of one ring of duct piece ring of the preset construction area and the adjacent block adjacent to the top sealing block to form the first excavation area.
Optionally, the step of removing the top sealing block of one ring segment ring of the preset construction area and the adjacent block adjacent to the top sealing block to form the first excavation area includes:
Cutting the annular seam and the longitudinal seam of the sealing top block of one ring of the segment ring in the preset construction area by utilizing a water drill;
traction and demolition are carried out on the capping block;
Cutting the annular seam and the longitudinal seam of the adjacent block adjacent to the capping block by using the water drill;
And traction dismantling is carried out on the adjacent blocks to form the first excavation area.
Optionally, the step of excavating the first excavation region to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width and completing primary support construction includes:
According to the preset width, digging the first digging area to the preset depth in the direction away from the central axis of the existing shield tunnel to form a first area to be supported;
a first primary support steel frame is applied to the first area to be supported, and foot locking anchor rods are synchronously applied;
Performing concrete spraying construction on the first area to be supported;
And continuing to excavate the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width, and completing the primary support construction.
Optionally, continuing to dig the first excavation region to the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width, and completing the primary support construction, including:
Continuing to excavate the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width to form a second region to be supported;
A second primary support steel frame is applied to the second area to be supported, and foot locking anchor rods are synchronously applied;
and carrying out concrete spraying construction on the second area to be supported, and completing primary support construction.
Optionally, after the step of performing concrete spraying construction on the second area to be supported and completing the primary support construction, the method further includes:
removing a top sealing block and an adjacent block of the segment ring corresponding to the second region to be supported;
and taking the position corresponding to the second area to be supported as the position corresponding to the first area to be supported, repeatedly executing the excavation construction of the first excavation area by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first area to be supported according to the preset width, and forming the second area to be supported until the excavation construction of the first excavation area is completed.
Optionally, the step of excavating the second excavation region to the preset depth in a direction away from the central axis according to the preset width and completing the primary support construction includes:
removing standard blocks of one ring of the segment ring according to the preset width;
Excavating and constructing the second excavation region to the preset depth in a direction away from the central axis to form a third region to be supported; wherein the third region to be supported corresponds to the first region to be supported;
a third primary support steel frame is applied to the third area to be supported, and foot locking anchor rods are synchronously applied; wherein the third primary support steel frame is connected with the first primary support steel frame;
and carrying out concrete spraying construction on the third area to be supported, and completing primary support construction.
Optionally, after the step of performing concrete spraying construction on the third area to be supported and completing the primary support construction, the method further includes:
continuing to dismantle the standard blocks of the adjacent segment ring;
Excavating and constructing the second excavation area to the preset depth in the direction away from the central axis according to the preset width to form a fourth area to be supported; the fourth area to be supported corresponds to the second area to be supported;
a fourth primary support steel frame is applied to the fourth area to be supported, and foot locking anchor rods are synchronously applied; the fourth primary support steel frame is connected with the second primary support steel frame;
And carrying out concrete spraying construction on the fourth area to be supported, taking the fourth area to be supported as the third area to be supported, and repeatedly executing the step of continuously dismantling the standard blocks of the adjacent ring of duct piece rings until the excavation construction of the second excavation area is completed.
Optionally, before the step of removing one of the ring segment rings of the preset construction area to form the current construction area, the method further includes:
and carrying out advanced geological forecast on the preset construction area.
Optionally, after continuing to dismantle a ring of the segment ring and repeatedly executing the step of excavating the first excavation region according to the preset width to a preset depth in a direction away from the central axis of the existing shield tunnel, and completing the step of primary support construction until the excavation construction of the preset construction region is completed, and after forming the step of expanding the excavation section, further including:
And carrying out secondary lining construction on the preset excavation area.
According to the technical scheme, a current construction area is formed by removing one ring of segment rings of a preset construction area, a preset depth is excavated for a first excavation area in a direction away from the central axis of an existing shield tunnel according to a preset width, primary support construction is completed, a preset depth is excavated for a second excavation area in a direction away from the central axis according to the preset width, primary support construction is completed, the ring of segment rings is continuously removed, the preset depth is excavated for the first excavation area in a direction away from the central axis of the existing shield tunnel according to the preset width, primary support construction is completed, and an excavation section is formed until excavation construction of the preset construction area is completed, so that when the method is used, communication channel construction can be conducted through a strong development area of a ground crack, construction difficulty is reduced, and construction safety of the excavation section is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an existing shield tunnel expanding and excavating construction method according to an embodiment of the present invention;
FIG. 2 is a flow chart of step S110 of an example of the present invention;
FIG. 3 is a flowchart of an exemplary step S400 of the present invention;
fig. 4 is a flowchart of step S440 of an example of the present invention;
fig. 5 is a flowchart of an exemplary step S300 of the present invention;
fig. 6 is a flowchart of step S340 of an example of the present invention;
FIG. 7 is a flow chart of some embodiments of examples of the invention;
FIG. 8 is a schematic view of an exemplary counter top block and adjacent blocks of the present invention with a predetermined depth of digging;
FIG. 9 is a schematic view of an exemplary construction of the present invention for erecting an upper half section primary support steel frame and performing concrete spraying;
FIG. 10 is a schematic view of an exemplary structure of a excavated residual soil body according to the present invention;
FIG. 11 is a schematic view of an exemplary construction of an upper half arch with a next cycle leading duct and shotcrete;
fig. 12 is a schematic view of an exemplary construction of the present invention with a lower half section segment removed and a construction operation performed;
FIG. 13 is a longitudinal excavation construction sequence diagram illustrating an example of the present invention;
Fig. 14 is a schematic diagram of an exemplary excavation lateral construction sequence.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the mechanisms in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The inventive concept of the present invention is further elucidated below in connection with some embodiments.
The invention provides an existing shield tunnel expanding and excavating construction method.
As shown in fig. 1 to 14, an embodiment of the existing shield tunnel expansion and excavation construction method of the present invention is proposed.
In this embodiment, referring to fig. 1 to 14, the existing shield tunnel expanding and excavating construction method is characterized by comprising the following steps:
s100, removing one ring of segment rings of a preset construction area to form a current construction area; the current construction area comprises a first excavation area and a second excavation area arranged below the first excavation area;
S200, excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width, and completing primary support construction; the preset width is smaller than or equal to the extension length of the current construction area along the length direction of the existing shield tunnel;
s300, excavating the second excavation area to the preset depth in the direction away from the central axis according to the preset width, and completing primary support construction;
s400, continuously removing a ring of the duct piece ring, repeatedly executing the excavation of the first excavation region to a preset depth in a direction away from the central axis of the existing shield tunnel according to the preset width, and completing the primary support construction until the excavation construction of the preset construction region is completed, so as to form an expanded excavation section.
The method comprises the steps of removing one ring of segment rings of a preset construction area to form a current construction area, excavating a preset depth of a first excavation area in a direction away from the central axis of an existing shield tunnel according to a preset width, completing primary support construction, excavating a preset depth of a second excavation area in a direction away from the central axis according to the preset width, completing primary support construction, continuing removing the one ring of segment rings, repeatedly executing the steps of excavating the preset depth of the first excavation area in the direction away from the central axis of the existing shield tunnel according to the preset width, completing primary support construction until the excavation construction of the preset construction area is completed, and forming an expanded excavation section.
Optionally, the step of removing one of the ring segment rings of the preset construction area to form the current construction area includes:
S110, removing the top sealing block of one ring of duct piece rings in the preset construction area and the adjacent block adjacent to the top sealing block to form the first excavation area.
Optionally, the step of removing the top sealing block of one ring segment ring of the preset construction area and the adjacent block adjacent to the top sealing block to form the first excavation area includes:
S111, cutting a circular seam and a longitudinal seam of the sealing top block of one ring of the segment ring in the preset construction area by using a water drill;
S112, pulling and dismantling the capping block;
S113, cutting the circular seam and the longitudinal seam of the adjacent block adjacent to the capping block by utilizing the water drill;
and S114, traction and demolition are carried out on the adjacent blocks to form the first excavation area.
Optionally, the step of excavating the first excavation region to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width and completing primary support construction includes:
S410, digging the first digging area to the preset depth in the direction away from the central axis of the existing shield tunnel according to the preset width to form a first area to be supported;
s420, constructing a first primary support steel frame in the first area to be supported, and synchronously constructing foot locking anchor rods;
s430, performing concrete spraying construction on the first area to be supported;
S440, continuing to excavate the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width, and completing primary support construction.
Optionally, continuing to dig the first excavation region to the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width, and completing the primary support construction, including:
S441, continuing to dig the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width to form a second region to be supported;
S442, constructing a second primary support steel frame in the second area to be supported and synchronously constructing foot locking anchor rods;
S443, performing concrete spraying construction on the second area to be supported, and completing primary support construction.
Optionally, after the step of performing concrete spraying construction on the second area to be supported and completing the primary support construction, the method further includes:
s444, removing a top sealing block and an adjacent block of the segment ring corresponding to the second region to be supported;
s445, taking the position corresponding to the second area to be supported as the position corresponding to the first area to be supported, repeatedly executing the excavation construction of the first excavation area by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first area to be supported according to the preset width, and forming the second area to be supported until the excavation construction of the first excavation area is completed.
Optionally, the step of excavating the second excavation region to the preset depth in a direction away from the central axis according to the preset width and completing the primary support construction includes:
s310, removing standard blocks of one ring of the segment ring according to the preset width;
S320, excavating and constructing the second excavation region to the preset depth in a direction away from the central axis to form a third region to be supported; wherein the third region to be supported corresponds to the first region to be supported;
S330, a third primary support steel frame is applied to the third area to be supported, and foot locking anchor rods are synchronously applied; wherein the third primary support steel frame is connected with the first primary support steel frame;
And S340, performing concrete spraying construction on the third to-be-supported area to finish the primary support construction.
Optionally, after the step of performing concrete spraying construction on the third area to be supported and completing the primary support construction, the method further includes:
S341, continuously removing the standard blocks of the adjacent segment ring;
s342, excavating and constructing the second excavation area to the preset depth in the direction away from the central axis according to the preset width to form a fourth area to be supported; the fourth area to be supported corresponds to the second area to be supported;
S343, a fourth primary support steel frame is applied to the fourth area to be supported, and foot locking anchor rods are synchronously applied; the fourth primary support steel frame is connected with the second primary support steel frame;
And S344, performing concrete spraying construction on the fourth area to be supported, taking the fourth area to be supported as the third area to be supported, and repeatedly executing the step of continuously dismantling the standard blocks of the adjacent ring of the segment ring until the excavation construction of the second excavation area is completed.
Optionally, before the step of removing one of the ring segment rings of the preset construction area to form the current construction area, the method further includes:
s500, performing advanced geological forecast on the preset construction area.
Optionally, after continuing to dismantle a ring of the segment ring and repeatedly executing the step of excavating the first excavation region according to the preset width to a preset depth in a direction away from the central axis of the existing shield tunnel, and completing the step of primary support construction until the excavation construction of the preset construction region is completed, and after forming the step of expanding the excavation section, further including:
S600, carrying out secondary lining construction on the preset excavation area.
① Digging soil mass with the upper half section of 750mm by a digging machine, and applying a first truss primary support steel frame, a foot locking anchor rod and sprayed concrete on the upper half section;
② Digging soil body with the upper half section of 750mm again, removing the sealing top block, the adjacent block duct pieces, and transporting the duct pieces and the dregs; and (3) constructing a second primary support steel frame with the upper half section, a foot locking anchor rod, a vault leading small guide pipe and spraying primary support concrete.
③ The equipment is dismantled 2 standard blocks, the equipment is forwards expanded and dug to the next ring, and the lower standard blocks are dismantled through the equipment; and excavating the soil body of the lower half section, transporting the duct pieces and the dregs to the outside of the hole, and applying a lower primary support and a temporary vertical support.
④ And (3) circulating the three steps to finish the primary support of the expansion and excavation from the reinforced area to the small mileage section, transferring equipment, performing expansion and excavation construction from the reinforced area to the large mileage direction, and simultaneously starting to construct the secondary lining of the small mileage section in the expansion and excavation area.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The existing shield tunnel expanding and excavating construction method is characterized by comprising the following steps of:
Removing one ring of segment rings of the preset construction area to form a current construction area; the current construction area comprises a first excavation area and a second excavation area arranged below the first excavation area;
Excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to a preset width, and completing primary support construction; the preset width is smaller than or equal to the extension length of the current construction area along the length direction of the existing shield tunnel;
Excavating the second excavation area to the preset depth in the direction away from the central axis according to the preset width, and completing primary support construction;
And continuously removing a ring of the duct piece ring, repeatedly executing the steps of excavating the first excavation area to a preset depth in a direction away from the central axis of the existing shield tunnel according to the preset width, and completing primary support construction until the excavation construction of the preset construction area is completed, so as to form an expanded excavation section.
2. The method for constructing the existing shield tunnel by expanding excavation according to claim 1, wherein the step of removing one of the segment rings of the preset construction area to form the current construction area comprises the steps of:
and removing the top sealing block of one ring of duct piece ring of the preset construction area and the adjacent block adjacent to the top sealing block to form the first excavation area.
3. The method for constructing a pre-existing shield tunnel according to claim 2, wherein the step of removing the capping block of one of the ring segment rings of the pre-set construction area and the adjacent block adjacent to the capping block to form the first excavation area comprises the steps of:
Cutting the annular seam and the longitudinal seam of the sealing top block of one ring of the segment ring in the preset construction area by utilizing a water drill;
traction and demolition are carried out on the capping block;
Cutting the annular seam and the longitudinal seam of the adjacent block adjacent to the capping block by using the water drill;
And traction dismantling is carried out on the adjacent blocks to form the first excavation area.
4. The method for expanding excavation construction of an existing shield tunnel according to claim 3, wherein the step of excavating the first excavation region to a predetermined depth in a direction away from a central axis of the existing shield tunnel according to a predetermined width and completing the primary support construction comprises:
According to the preset width, digging the first digging area to the preset depth in the direction away from the central axis of the existing shield tunnel to form a first area to be supported;
a first primary support steel frame is applied to the first area to be supported, and foot locking anchor rods are synchronously applied;
Performing concrete spraying construction on the first area to be supported;
And continuing to excavate the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width, and completing the primary support construction.
5. The method for constructing the existing shield tunnel by expanding excavation according to claim 4, wherein the step of continuing the excavation construction for the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first area to be supported according to the preset width, comprises the steps of:
Continuing to excavate the first excavation region by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first region to be supported according to the preset width to form a second region to be supported;
A second primary support steel frame is applied to the second area to be supported, and foot locking anchor rods are synchronously applied;
and carrying out concrete spraying construction on the second area to be supported, and completing primary support construction.
6. The method for expanding a tunnel according to claim 5, wherein after the step of performing the concrete injection construction on the second area to be supported and completing the preliminary support construction, further comprising:
removing a top sealing block and an adjacent block of the segment ring corresponding to the second region to be supported;
and taking the position corresponding to the second area to be supported as the position corresponding to the first area to be supported, repeatedly executing the excavation construction of the first excavation area by the preset depth along the extending direction of the shield tunnel at the position corresponding to the first area to be supported according to the preset width, and forming the second area to be supported until the excavation construction of the first excavation area is completed.
7. The method of construction for expanding a shield tunnel according to any one of claims 1 to 6, wherein the step of excavating the second excavation region in a direction away from the central axis by the preset depth according to the preset width and completing the preliminary supporting construction comprises:
removing standard blocks of one ring of the segment ring according to the preset width;
Excavating and constructing the second excavation region to the preset depth in a direction away from the central axis to form a third region to be supported; wherein the third region to be supported corresponds to the first region to be supported;
a third primary support steel frame is applied to the third area to be supported, and foot locking anchor rods are synchronously applied; wherein the third primary support steel frame is connected with the first primary support steel frame;
and carrying out concrete spraying construction on the third area to be supported, and completing primary support construction.
8. The method for expanding a tunnel according to claim 7, wherein after the step of performing the concrete injection construction on the third area to be supported and completing the preliminary support construction, further comprising:
continuing to dismantle the standard blocks of the adjacent segment ring;
Excavating and constructing the second excavation area to the preset depth in the direction away from the central axis according to the preset width to form a fourth area to be supported; the fourth area to be supported corresponds to the second area to be supported;
a fourth primary support steel frame is applied to the fourth area to be supported, and foot locking anchor rods are synchronously applied; the fourth primary support steel frame is connected with the second primary support steel frame;
And carrying out concrete spraying construction on the fourth area to be supported, taking the fourth area to be supported as the third area to be supported, and repeatedly executing the step of continuously dismantling the standard blocks of the adjacent ring of duct piece rings until the excavation construction of the second excavation area is completed.
9. The method for expanding and excavating an existing shield tunnel according to any one of claims 1 to 6, wherein before the step of removing one of the segment rings of the preset construction area to form the current construction area, further comprises:
and carrying out advanced geological forecast on the preset construction area.
10. The method of expanding excavation construction of an existing shield tunnel according to any one of claims 1 to 6, wherein after continuing to remove a ring of the segment ring and repeatedly performing the step of excavating the first excavation region by a predetermined width to a predetermined depth in a direction away from a central axis of the existing shield tunnel and completing the step of primary support construction until the excavation construction of the predetermined construction region is completed, the method further comprises, after forming an expanded excavation section:
And carrying out secondary lining construction on the preset excavation area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410563811.6A CN118292893A (en) | 2024-05-08 | 2024-05-08 | Existing shield tunnel expanding and excavating construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410563811.6A CN118292893A (en) | 2024-05-08 | 2024-05-08 | Existing shield tunnel expanding and excavating construction method |
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| CN118292893A true CN118292893A (en) | 2024-07-05 |
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| CN202410563811.6A Pending CN118292893A (en) | 2024-05-08 | 2024-05-08 | Existing shield tunnel expanding and excavating construction method |
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- 2024-05-08 CN CN202410563811.6A patent/CN118292893A/en active Pending
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