CN113374502A - Construction method for reinforcing cavity by splicing lining grouting based on mine method tunnel construction - Google Patents
Construction method for reinforcing cavity by splicing lining grouting based on mine method tunnel construction Download PDFInfo
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- CN113374502A CN113374502A CN202110863769.6A CN202110863769A CN113374502A CN 113374502 A CN113374502 A CN 113374502A CN 202110863769 A CN202110863769 A CN 202110863769A CN 113374502 A CN113374502 A CN 113374502A
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- grouting
- prefabricated
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 15
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 12
- 230000000903 blocking effect Effects 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction method for reinforcing a cavity by splicing lining grouting based on mine tunnel construction, which comprises the following steps of: step A, early-stage work preparation; b, grouting after the arch crown is backfilled with concrete, and stopping grouting when mortar overflows from the exhaust pipe; step C, radial grouting: after the radial grouting holes are punched through by electric drills, the radial grouting holes are used for grouting, when the exhaust pipe overflows, grouting is stopped, and the radial grouting holes are blocked by grouting hole spiral pipes; step D, longitudinal seam grouting: blocking the prefabricated duct piece and the outer side of the morning joint of the side wall by using mortar, and then grouting from a longitudinal joint grouting hole; and E, constructing the next group of tunnel linings according to the sequence of the steps A-D until the secondary lining of the tunnel is completely constructed. The invention relates to a construction method capable of solving the problem of cavities between a prefabricated pipe piece and a primary support and at the splicing position of the prefabricated pipe piece and a side wall.
Description
Technical Field
The invention relates to a tunnel concrete lining construction technology, in particular to a construction method for reinforcing cavities by cast-in-place grouting of prefabricated pipe pieces and side walls of tunnel arch parts.
Background
The mining method adopts the traditional construction process of the secondary lining of the tunnel, and adopts the principle that the gravity of concrete is utilized to fill the space of the secondary lining by injecting the concrete into the vertical pouring hole at the top part hole by hole. Because the fluidity of the concrete is difficult to reach an ideal state, after the concrete is poured into the vault of the tunnel, the whole pouring longitudinal section is basically in isosceles triangle normal distribution, the isosceles sides of the isosceles triangles change along with the size of the distance between the pouring openings, the larger the distance between the pouring openings is, the longer the isosceles triangle is, and the larger the gap is after the two backing materials is, the larger the gap is. This phenomenon also can change along with the size of concrete pump pressure that pours, and the evacuation phenomenon can reduce when pouring pressure is bigger than normal, and the evacuation phenomenon can increase when pouring pressure is bigger than normal, and the air between two vault pouring orifices also is difficult whole evacuation simultaneously, and the appearance of vault cavity phenomenon is inevitable.
Therefore, the traditional construction process of the tunnel secondary lining is limited by the existing pouring construction equipment and process, and the phenomenon of back void of the arch part of the secondary lining is common.
Disclosure of Invention
The invention aims to provide a construction method for reinforcing a cavity by splicing lining grouting based on mine tunnel construction, which has simple steps and clear operation and solves the problem of cavities between a prefabricated duct piece and a primary support and between the prefabricated duct piece and a side wall.
Therefore, the technical scheme adopted by the invention is as follows: a construction method for reinforcing a cavity by splicing lining grouting based on mine method tunnel construction comprises the following steps:
step A, early-stage work preparation: the method comprises the steps of pouring side walls in situ, conveying prefabricated pipe pieces into a tunnel after prefabrication outside the tunnel is completed, and longitudinally installing the prefabricated pipe pieces in groups, wherein at least two radial grouting holes with unpenetrated outer walls are formed in the prefabricated pipe pieces, two ends of each prefabricated pipe piece are respectively provided with a longitudinal seam grouting hole which gradually inclines downwards from the inner wall of each prefabricated pipe piece to an end head, the end heads of the prefabricated pipe pieces and the side walls are assembled in a hemispherical mode, the longitudinal grouting pipes and exhaust pipes are longitudinally arranged in parallel at the arch part of the tunnel and are tightly attached to a primary supporting waterproof plate, after the assembly is completed, plugging plates are installed on the outer sides of each group of prefabricated pipe pieces which are assembled finally and are used for plugging, the length of each longitudinal grouting pipe and each exhaust pipe is larger than the total length of each group of prefabricated pipe pieces, so that the longitudinal grouting pipes and each exhaust pipe extend to the outside the plugging plates, concrete backfilling pumping pipes are also installed on the plugging plates, and an observation window is reserved in the arch part;
b, vault concrete backfilling: carrying out vault concrete backfill through a concrete backfill pumping pipe;
step C, radial grouting: after the radial grouting hole is punched by an electric drill, performing cement mortar grouting by using the radial grouting hole, stopping grouting when the exhaust pipe overflows, and plugging the radial grouting hole by using a grouting hole spiral pipe;
step D, vault grouting: then, vault longitudinal grouting is carried out through a longitudinal grouting pipe, and grouting is stopped when mortar overflows from the exhaust pipe;
e, longitudinal seam grouting: blocking the outer surface of a joint formed by assembling the prefabricated duct piece and the side wall by using mortar, reserving an exhaust hole at a high point of the block, then grouting from a longitudinal joint grouting hole, observing at the high point, blocking the exhaust hole by using the mortar when the mortar is pressed to a high position, and maintaining the pressure at a low point for a period of time to finish the process;
and F, constructing the next group of tunnel linings according to the sequence of the steps A to E until the secondary lining of the tunnel is completely constructed.
Preferably, the reserved thickness of the radial grouting holes in the step A which are not penetrated is 5cm, and the diameters of the longitudinal grouting pipes and the pipeline of the exhaust pipe are both 3.2 cm.
Further preferably, when the prefabricated segments in the step A are constructed in groups, 5 prefabricated segments are used as a group for the first time, 6 prefabricated segments are used as a group, and 7 prefabricated segments are used for mounting, backfilling and grouting for the last group, so that the construction efficiency is improved. The lining is generally based on 6 prefabricated pipe pieces as one group, 5 prefabricated pipe pieces are used for the first time as one group, then 6 prefabricated pipe pieces are used as one group, the position of one prefabricated pipe piece can be vacated when each group is assembled except for the last group, the plugging plate is installed by utilizing the position of the prefabricated pipe piece, and 7 prefabricated pipe pieces are used in the last group to supplement the poor prefabricated pipe pieces.
Preferably, the backfill concrete in the step B is fine aggregate concrete, the grouting material in the steps C and D is M20 cement mortar, and the pressure is controlled at 0.1 MPa.
Preferably, the grouting material in the step E is grouting material, the water-material ratio is 0.14:1, and the grouting pressure is 0.1 MPa.
The invention has the beneficial effects that:
(1) by adopting the secondary lining construction method of the arch prefabricated duct piece and the side wall cast-in-place, the prefabricated duct piece is prefabricated and formed outside the tunnel, the quality defect of vertically pouring secondary lining concrete from bottom to top in the prior art can be effectively avoided, and the risk of vault falling and collapse is avoided.
(2) The novel process of longitudinal concrete backfill, radial grouting, longitudinal grouting and longitudinal seam filling is adopted, when arch grouting is carried out, concrete backfill and radial grouting are adopted, and longitudinal grouting and longitudinal seam filling are combined, so that the hidden dangers that single material grouting consumes long time, is not easy to fill, leaves arch cavities and the like can be avoided, grouting materials can fully fill the cavities behind the secondary lining, and the hidden safety quality danger caused by the tunnel arch cavities is effectively eliminated.
(3) The two ends of the prefabricated pipe piece are of hemispherical structures, so that the working stress is effectively reduced when the prefabricated pipe piece is assembled with a side wall, the abrasion is effectively reduced, and the negative conditions of bending, cracking and breaking of parts are reduced.
(4) The radial grouting hole of prefabricated section of jurisdiction does not pierce through prefabricated section of jurisdiction, avoids appearing the phenomenon that thick liquid spills over from radial grouting hole when carrying out the vault and pour, and the radial grouting hole of reserving simultaneously can be opened up fast again through the electric drill and carry out the slip casting, convenient and fast.
In conclusion, the method is simple in steps, efficient and feasible, and can be used for fully filling the cavity gaps generated after the secondary lining construction in three grouting directions, so that the firmness of the tunnel support is increased, and the safety of constructors is guaranteed.
Drawings
FIG. 1 is a schematic view of the longitudinal pressurized grouting of the present invention.
Fig. 2 is a schematic view of the structure of a prefabricated segment according to the present invention.
Fig. 3 is a partially enlarged view of fig. 2.
Fig. 4 is a schematic view of a grouting hole spiral tube structure.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1-4, a construction method for reinforcing a cavity by grouting an assembled lining based on mine-method tunnel construction includes the following steps:
step A, early-stage work preparation: and (4) pouring the side wall 1 in situ, and conveying the prefabricated pipe pieces 2 to the inside of the tunnel after the prefabrication outside the tunnel is finished and longitudinally installing the prefabricated pipe pieces in groups.
When the prefabricated pipe segments 2 are constructed in groups, preferably, 5 prefabricated pipe segments 2 are used as a group for the first time, then 6 prefabricated pipe segments 2 are used as a group, and finally 7 prefabricated pipe segments 2 are used for installation, backfilling and grouting.
Two radial grouting holes 21 which are not penetrated by the outer wall are formed in the prefabricated pipe piece 2, the two radial grouting holes 21 which are not penetrated by the outer wall are arranged in a bilateral symmetry mode, and the number of the radial grouting holes 21 is at least two, but not limited to two. The thickness of the radial grouting holes 21 is preferably 5cm, and the pipe diameters of the longitudinal grouting pipes 5 and the exhaust pipes 6 are preferably 3.2 cm.
Two ends of the prefabricated pipe piece 2 are respectively provided with a longitudinal joint grouting hole 22, the longitudinal joint grouting holes 22 are inclined holes with high inside and low outside, and the longitudinal joint grouting holes 22 gradually incline downwards from the inner wall of the prefabricated pipe piece 2 and extend to the end head.
The end of the prefabricated pipe piece 2 is spliced with the side wall 1 in a hemispherical manner. The longitudinal grouting pipes 5 and the exhaust pipes 6 are longitudinally and parallelly located on the tunnel arch 3 and tightly attached to the waterproof plate of the primary support 4, after assembly is completed, the outer side of each group of prefabricated pipe pieces 2 assembled at last is provided with a plugging plate 7 for plugging, the length of each longitudinal grouting pipe 5 and each exhaust pipe 6 is larger than the total length of each group of prefabricated pipe pieces 2, so that the longitudinal grouting pipes 5 and the exhaust pipes 6 extend out of the plugging plates 7, the plugging plates 7 are also provided with concrete backfill pumping pipes 9, and an observation window is reserved in the arch for observing whether concrete is filled.
B, vault concrete backfilling: and (4) carrying out vault concrete backfill through the concrete backfill pumping pipe 9, wherein the backfill concrete adopts fine aggregate concrete.
Step C, radial grouting: after the radial grouting hole 21 is punched through by an electric drill, the radial grouting hole 21 is utilized for grouting, the grouting material is preferably M20 cement mortar, the pressure is controlled to be 0.1Mpa, when the exhaust pipe 6 overflows, grouting is stopped, and the radial grouting hole 21 is blocked by the grouting hole spiral pipe 8.
Step D, vault grouting: and the longitudinal grouting pipe 5 performs vault longitudinal grouting, and grouting is stopped when mortar overflows from the exhaust pipe 6.
E, longitudinal seam grouting: and (2) blocking the outer surface of a joint formed by assembling the prefabricated pipe piece 2 and the side wall 1 by using mortar, reserving an exhaust hole at the high point of the block, grouting from a longitudinal joint grouting hole 22, preferably adopting grouting material, wherein the water-material ratio is 0.14:1, the grouting pressure is 0.1MPa, observing at the high point, blocking the exhaust hole by using the mortar when the slurry is pressed to the high point, and maintaining the pressure at the low point for a period of time to finish the process.
And F, constructing the next group of tunnel linings according to the sequence of the steps A to E until the secondary lining of the tunnel is completely constructed.
Claims (5)
1. A construction method for reinforcing a cavity by grouting an assembled lining based on mine method tunnel construction is characterized by comprising the following steps:
step A, early-stage work preparation: the side wall (1) is cast in place, the prefabricated pipe pieces (2) are transported into the tunnel after being prefabricated outside the tunnel and are longitudinally installed in groups, at least two radial grouting holes (21) with unpenetrated outer walls are formed in the prefabricated pipe pieces (2), two longitudinal seam grouting holes (22) are formed in two ends of each prefabricated pipe piece (2) and gradually incline downwards from the inner wall of the prefabricated pipe piece (2) to the end, the end of each prefabricated pipe piece (2) and the side wall (1) are assembled in a hemispherical mode, the longitudinal grouting pipes (5) and the exhaust pipes (6) are longitudinally arranged in parallel in the arch portion (3) of the tunnel and are tightly attached to a waterproof plate of an initial support (4), after the prefabricated pipe pieces are assembled, a plugging plate (7) is installed on the outer side of each group of the prefabricated pipe pieces (2) which are assembled finally, the length of each longitudinal grouting pipe (5) and each exhaust pipe (6) is larger than the total length of each group of the prefabricated pipe pieces (2), so that the longitudinal grouting pipes (5) and the exhaust pipes (6) extend out of each group of the plugging plate (7), a concrete backfill pumping pipe (9) is also arranged on the plugging plate (7), and an observation window is reserved in the arch part;
b, vault concrete backfilling: vault concrete backfilling is carried out through a concrete backfilling pumping pipe (9);
step C, radial grouting: after the radial grouting hole (21) is punched through by an electric drill, cement mortar grouting is carried out by utilizing the radial grouting hole (21), when the exhaust pipe (6) overflows, grouting is stopped, and the radial grouting hole (21) is blocked by using a grouting hole spiral pipe (8);
step D, vault grouting: carrying out vault longitudinal grouting through a longitudinal grouting pipe (5), and stopping grouting when mortar overflows from the exhaust pipe (6);
e, longitudinal seam grouting: blocking the outer surface of a joint where the prefabricated pipe piece (2) and the side wall (1) are assembled by mortar, reserving an exhaust hole at a high point of the block, then grouting from a longitudinal joint grouting hole (22), observing at the high point, blocking the exhaust hole by the mortar when the slurry is pressed to the high point, and maintaining the pressure at the low point for a period of time to finish the process;
and F, constructing the next group of tunnel linings according to the sequence of the steps A to E until the secondary lining of the tunnel is completely constructed.
2. The construction method for reinforcing the cavity by grouting the spliced lining based on the mine tunnel construction, according to claim 1, is characterized in that: the reserved thickness of the radial grouting holes (21) in the step A which are not penetrated is 5cm, and the diameters of the longitudinal grouting pipes (5) and the exhaust pipes (6) are both 3.2 cm.
3. The construction method for reinforcing the cavity by grouting the spliced lining based on the mine tunnel construction, according to claim 1, is characterized in that: and B, when the prefabricated pipe pieces (2) in the step A are constructed in groups, 5 prefabricated pipe pieces (2) are used as a group for the first time, 6 prefabricated pipe pieces (2) are used as a group for the later time, and 7 prefabricated pipe pieces (2) are used for installation, backfilling and grouting for the last group.
4. The construction method for reinforcing the cavity by grouting the spliced lining based on the mine tunnel construction, according to claim 1, is characterized in that: and B, adopting fine aggregate concrete as the backfilling concrete in the step B, adopting M20 cement mortar as the grouting material in the steps C and D, and controlling the pressure to be 0.1 Mpa.
5. The construction method for reinforcing the cavity by grouting the spliced lining based on the mine tunnel construction, according to claim 1, is characterized in that: and E, adopting grouting material as grouting material, wherein the water-material ratio is 0.14:1, and the grouting pressure is 0.1 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110863769.6A CN113374502B (en) | 2021-07-29 | 2021-07-29 | Construction method for splicing lining grouting reinforcement cavity based on mine tunnel construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110863769.6A CN113374502B (en) | 2021-07-29 | 2021-07-29 | Construction method for splicing lining grouting reinforcement cavity based on mine tunnel construction |
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| CN113374502A true CN113374502A (en) | 2021-09-10 |
| CN113374502B CN113374502B (en) | 2024-07-23 |
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