CN114961739A - Construction method for re-excavation and expanded excavation of abandoned tunnel - Google Patents
Construction method for re-excavation and expanded excavation of abandoned tunnel Download PDFInfo
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- CN114961739A CN114961739A CN202210528331.7A CN202210528331A CN114961739A CN 114961739 A CN114961739 A CN 114961739A CN 202210528331 A CN202210528331 A CN 202210528331A CN 114961739 A CN114961739 A CN 114961739A
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- tunnel
- excavation
- shield machine
- abandoned
- receiving
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 38
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 239000002699 waste material Substances 0.000 claims abstract description 34
- 230000005641 tunneling Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims 2
- 238000005728 strengthening Methods 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction method for re-excavating, expanding and excavating abandoned tunnels, which comprises the following steps: s1: excavating an originating vertical shaft and a receiving vertical shaft for lowering and receiving a shield machine at two ends of a preset interval of the heavy excavation and expanded excavation of the waste tunnel; s2: performing muck backfilling in a preset interval of the re-excavation and expanding excavation of the waste tunnel to increase the stability of the tunnel face tunneled by the shield tunneling machine; s3: and (3) lowering the shield machine through the starting vertical shaft, performing tunneling excavation on the preset region of the re-excavation and expanding excavation of the waste tunnel, and taking the shield machine out of the receiving vertical shaft when the shield machine is excavated to the receiving vertical shaft, thus finishing the construction of the preset new tunnel. The method provided by the invention has the advantages that the steps of excavating an originating vertical shaft and a receiving vertical shaft, backfilling, lowering a large-caliber shield machine, reaming and tunneling the large-caliber shield machine, receiving the large-caliber shield machine and the like are utilized, the abandoned tunnel can be directly excavated and dug, the aim of rebuilding the abandoned tunnel can be realized, and the method has great significance for realizing the reutilization of the abandoned underground space and eliminating the potential safety hazard of the abandoned tunnel.
Description
Technical Field
The invention belongs to the field of tunnel and underground construction engineering, and particularly relates to a method for recycling a waste tunnel.
Background
With the continuous development of urban construction, the number of abandoned tunnels is gradually increased. For example, civil air defense engineering tunnels which are gradually eliminated at present, abandoned tunnels due to construction reasons or geological reasons, small-section tunnels which cannot meet the development requirements of the times, and the like are built in early stages, the utilization rate of the original tunnels is gradually reduced, and the original tunnels are finally abandoned.
Most of abandoned tunnels in the prior art are not reasonably reused, and a plurality of abandoned tunnels are in an open management state, so that scarce underground space resources are occupied, and certain potential safety hazards exist. Therefore, reuse of the abandoned tunnel is imperative.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background technology, and provide a construction method for re-excavating and expanding excavation of a waste tunnel, which can realize efficient reuse of the waste tunnel. In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a construction method for re-excavation and expanding excavation of abandoned tunnels comprises the following steps:
s1: excavating an originating vertical shaft and a receiving vertical shaft for lowering and receiving a shield machine (a large-diameter shield machine) at two ends of a preset interval of heavy excavation and expanded excavation of the waste tunnel;
s2: performing muck backfilling in a preset interval of the re-excavation and expanding excavation of the waste tunnel to increase the stability of the tunnel face tunneled by the shield tunneling machine;
s3: and (3) lowering the shield machine through the starting vertical shaft, performing tunneling excavation on the preset region of the re-excavation and expanding excavation of the waste tunnel, and taking the shield machine out of the receiving vertical shaft when the shield machine is excavated to the receiving vertical shaft, thus finishing the construction of the preset new tunnel.
In the construction method, preferably, the position where the originating shaft and the receiving shaft are to be excavated is subjected to stratum reinforcement and structure reinforcement treatment, and then the originating shaft and the receiving shaft are excavated; the stratum is reinforced by grouting, and the structure is reinforced by adopting a temporary inner support.
In the above construction method, preferably, the muck backfilling refers to backfilling the abandoned tunnel after curing the muck excavated from other tunnels before the abandoned tunnel is dug again and expanded, so that the tunnel face excavated by the large-diameter shield tunneling machine is stable.
In the above construction method, preferably, a hob and a tearing knife are mounted on a cutter head of the shield machine; and arranging the hobbing cutters and the tearing cutters at the crossed positions of the cutter track and the waste tunnel lining at intervals, wherein the cutter edges of the tearing cutters are higher than the cutter edges of the hobbing cutters, the height difference between the cutter edges and the tearing cutters is larger than or equal to the diameter of the main ribs in the waste tunnel lining, so that the main ribs in the waste tunnel lining are cut and broken by the tearing cutters before the concrete constraint is not lost, and then the hobbing cutters are used for crushing concrete. By adopting the cutter head assembled with the hob and the tearing knife, the abandoned tunnel can be directly dug and expanded without preprocessing the lining of the existing abandoned tunnel, so that the construction workload can be reduced.
In the above construction method, preferably, the centers of the abandoned tunnel and the preset new tunnel are not coincident. The non-coincidence circle centers can prevent the abandoned tunnel from rotating under the action of the cutter head of the large-caliber shield tunneling machine in the excavation process.
In the above construction method, preferably, the caliber of the preset new tunnel is larger than the caliber of the abandoned tunnel.
The construction method for re-excavating and expanding excavation of the waste tunnel comprises six steps of initial reinforcement, excavation of an originating vertical shaft and a receiving vertical shaft, backfilling of the waste tunnel, lowering of a large-caliber shield tunneling machine, large-caliber shield tunneling and receiving of the large-caliber shield tunneling machine. The initial consolidation means formation consolidation and structural consolidation for the position where the originating shaft and the receiving shaft are to be excavated before all works are started. The excavation of the originating shaft and the receiving shaft means that two shafts for originating and receiving shield machines are excavated at both ends of a predetermined section when the original abandoned tunnel is not reconstructed. And the backfilling is to use the dregs dug out by other tunnels to solidify and fill the abandoned tunnels. The lower enlarged bore shield machine is the shield machine lowered from the originating shaft to the originating location. The large-caliber shield tunneling refers to tunneling of a large-caliber shield machine from an originating well to a receiving well so as to achieve the purpose of tunnel reconstruction. The large-diameter shield machine is received, namely the large-diameter shield machine falls out of the receiving vertical shaft when the large-diameter shield machine excavates the receiving vertical shaft. The construction method can be widely applied to tunnel engineering of subways, railways, electric power, water conservancy and the like, can quickly realize the reconstruction construction target of the abandoned tunnel, and has great significance for realizing the reutilization of the abandoned underground space.
Compared with the prior art, the invention has the advantages that:
1. the construction method provided by the invention has the advantages that the steps of excavating an originating vertical shaft and a receiving vertical shaft, backfilling, lowering a large-caliber shield machine, carrying out reaming and tunneling on the large-caliber shield, receiving the large-caliber shield machine and the like are utilized, the abandoned tunnel can be directly excavated in an expanding and re-excavating manner, the aim of rebuilding the abandoned tunnel can be realized, and the construction method has great significance for realizing the reutilization of the abandoned underground space and eliminating the potential safety hazard of the abandoned tunnel.
2. The construction method of the invention utilizes the large-diameter shield machine to excavate and expand the abandoned tunnel, fully exerts the advantages of good anti-seepage performance, quick and safe construction, high construction efficiency, small influence on the surrounding environment and the like of the shield construction method, and has great significance for recovering the scarce underground space resources occupied by the abandoned tunnel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the construction method of the present invention.
Fig. 2 is a knife profile of a shield tunneling machine cutterhead of the present invention.
Fig. 3 is a schematic cross-sectional view of a tunnel according to the construction method of the present invention.
Illustration of the drawings:
11. starting a vertical shaft; 12. a shield machine; 13. backfilling the waste tunnel; 14. receiving a vertical shaft; 21. hobbing cutters; 22. a tearing knife; 31. abandoning the tunnel; 32. a new tunnel is preset.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The embodiment is as follows:
as shown in fig. 1, the construction method for heavy excavation and expanded excavation of a abandoned tunnel of the present embodiment includes the following steps:
s1: excavating an originating shaft 11 and a receiving shaft 14 for lowering and receiving a shield machine 12 at both ends of a predetermined section of the abandoned tunnel 31 dug again and expanded;
s2: carrying out muck backfilling on the waste tunnel 31 in the re-excavation and expansion excavation preset interval to obtain a backfilled waste tunnel 13 so as to increase the stability of the tunnel face tunneled by the shield tunneling machine 12;
s3: the shield machine 12 is lowered through the starting shaft 11 and excavation is performed on the predetermined section of the abandoned tunnel 31 dug again, and when the shield machine 12 excavates the receiving shaft 14, the shield machine 12 is taken out from the receiving shaft 14, that is, construction of the preset new tunnel 32 (the diameter of the preset new tunnel 32 is larger than that of the abandoned tunnel 31, and therefore the large-diameter shield machine 12 is adopted) is completed.
In this embodiment, first, the positions where the originating shaft 11 and the receiving shaft 14 are to be excavated are subjected to stratum reinforcement and structure reinforcement, and then the originating shaft 11 and the receiving shaft 14 are excavated; the stratum is reinforced by grouting, and the structure is reinforced by temporary inner supports.
In this embodiment, the step of backfilling the waste tunnel 31 is to backfill the waste tunnel 31 with the solidified waste excavated from the other tunnels before the waste tunnel 31 is dug again and expanded.
In this embodiment, a hob 21 and a tearing knife 22 are mounted on a cutter head of the shield machine 12; the hob 21 and the tearing knife 22 are arranged at the intersection position of the cutter track and the waste tunnel 31 lining at intervals, the knife edge of the tearing knife 22 is higher than the knife edge of the hob 21, the height difference between the two is larger than or equal to the diameter of the main rib in the waste tunnel 31 lining, so that the main rib in the waste tunnel 31 lining is cut and broken by the tearing knife 22 before the concrete constraint is not lost, and then the hob 21 is used for crushing the concrete. Specifically, as shown in fig. 2, the semicircular knife profile is a hob 21, the triangular knife profile is a tearing knife 22, and the tearing knife 22 is arranged in a knife profile higher than the hob 21, so that the steel bar can be effectively cut.
As shown in fig. 3, in the present embodiment, the centers of the abandoned tunnel 31 and the preset new tunnel 32 are not coincident. Namely, the sections of the waste tunnel 31 and the preset new tunnel 32 are not on the same center of circle, so that the waste tunnel 31 is prevented from rotating in the excavation process.
The construction method of the embodiment adopts the steps of initial reinforcement, excavation of the initial shaft 11 and the receiving shaft 14, backfilling, lowering of the large-diameter shield machine 12, hole expanding tunneling of the large-diameter shield machine 12, receiving of the large-diameter shield machine 12 and the like, adopts the cutterhead formed by mixing the tearing cutter 22 and the hobbing cutter 21, can directly expand and dig the heavy-excavation waste tunnel 31, can achieve the aim of rebuilding the waste tunnel 31, and has great significance for achieving reutilization of waste underground space.
Claims (6)
1. The construction method for re-digging and expanding excavation of the abandoned tunnel is characterized by comprising the following steps of:
s1: excavating an originating shaft (11) and a receiving shaft (14) for lowering and receiving a shield machine (12) at both ends of a predetermined section of the abandoned tunnel (31) dug again and expanded;
s2: performing muck backfilling in a preset interval of the re-excavation and expanding of the waste tunnel (31) to increase the stability of a tunnel face tunneled by the shield machine (12);
s3: and (3) lowering the shield machine (12) through the starting vertical shaft (11) and performing tunneling excavation on the preset area of the re-excavation and expanding excavation of the waste tunnel (31), and when the shield machine (12) excavates the receiving vertical shaft (14), taking out the shield machine (12) from the receiving vertical shaft (14), namely completing the construction of the preset new tunnel (32).
2. Construction method according to claim 1, characterised in that the site where the starting shaft (11) and the accept shaft (14) are to be excavated is first subjected to a formation strengthening and structural strengthening treatment, and the starting shaft (11) and the accept shaft (14) are excavated; the stratum is reinforced by grouting, and the structure is reinforced by a temporary inner support.
3. The construction method according to claim 1, wherein the residue soil backfilling is to backfill the abandoned tunnel (31) after the residue soil excavated from other tunnels is solidified before the abandoned tunnel (31) is dug again and expanded.
4. Construction method according to any of claims 1-3, characterized in that the cutterhead of the shield machine (12) is equipped with hob (21) and rip cutters (22); the method comprises the steps that hobbing cutters (21) and tearing cutters (22) are arranged at the intersecting positions of cutter tracks and the waste tunnel (31) lining at intervals, the cutter edges of the tearing cutters (22) are higher than the cutter edges of the hobbing cutters (21), the height difference of the hobbing cutters and the tearing cutters is larger than or equal to the diameter of main ribs in the waste tunnel (31) lining, so that the main ribs in the waste tunnel (31) lining are cut and broken through the tearing cutters (22) before concrete constraint is lost, and then the hobbing cutters (21) are used for crushing concrete.
5. A construction method according to any one of claims 1 to 3, wherein the abandoned tunnel (31) does not coincide with the centre of the preset new tunnel (32).
6. Construction method according to any of claims 1-3, characterized in that the caliber of the pre-set new tunnel (32) is greater than the caliber of the abandoned tunnel (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528331.7A CN114961739A (en) | 2022-05-16 | 2022-05-16 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528331.7A CN114961739A (en) | 2022-05-16 | 2022-05-16 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114961739A true CN114961739A (en) | 2022-08-30 |
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ID=82983746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210528331.7A Pending CN114961739A (en) | 2022-05-16 | 2022-05-16 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114961739A (en) |
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2022
- 2022-05-16 CN CN202210528331.7A patent/CN114961739A/en active Pending
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