CN109209438B - Construction method of tunnel lining structure by using steel fiber concrete - Google Patents
Construction method of tunnel lining structure by using steel fiber concrete Download PDFInfo
- Publication number
- CN109209438B CN109209438B CN201811208450.4A CN201811208450A CN109209438B CN 109209438 B CN109209438 B CN 109209438B CN 201811208450 A CN201811208450 A CN 201811208450A CN 109209438 B CN109209438 B CN 109209438B
- Authority
- CN
- China
- Prior art keywords
- steel fiber
- concrete
- cement
- steel
- coarse aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
Abstract
A construction method of a tunnel lining structure using steel fiber concrete is characterized in that specific steel fiber concrete is prepared by using cement, fly ash, fine aggregate, coarse aggregate and steel fiber, a steel fiber concrete structure is adopted to replace a stirrup method, and the tunnel lining structure is constructed, so that the problem that the casting quality is difficult to guarantee due to the fact that a steel bar net of the lining structure is arranged too densely is effectively solved, crack development is effectively controlled, and the durability of the lining structure is improved. The invention improves the shearing resistance of the concrete, and the structure has good ductility after construction.
Description
Technical Field
The invention relates to the technical field of underground building construction, in particular to a construction method of a tunnel lining structure by using steel fiber concrete.
Background
In the current common subway interval construction, a shield construction interval is adopted, shield lining segments are designed according to experience or a shield machine type by a shield manufacturer, and are often in great relation with the type selection of a shield machine, so that the difference of geological conditions cannot be completely considered; in the interval adopting manual excavation, the tunnel primary support lining adopts cast-in-place shotcrete, because the limitation of construction conditions, and the arrangement of lining reinforcing mesh is too dense, the casting quality is difficult to guarantee, and the subway tunnel receives the reciprocal load of train simultaneously, accelerates the crack development of lining segment, influences the intensity and the durability of lining segment, has great influence to the whole security of tunnel.
Disclosure of Invention
Aiming at the problems, the invention provides a construction method of a tunnel lining structure by using steel fiber concrete, a specific steel fiber concrete structure is used to replace a stirrup method, and the problem that the pouring quality is difficult to ensure due to the fact that the lining structure reinforcing mesh is arranged too densely is effectively solved, so that crack development is effectively controlled, and the durability of the lining structure is improved.
In order to achieve the purpose, the invention adopts the technical scheme that: a construction method of a tunnel lining structure using steel fiber concrete is characterized by comprising the following steps:
step 1), manufacturing steel fiber concrete;
step 2) the steel fiber concrete is poured symmetrically in a layered and left-right alternating mode, the pouring thickness of each layer is smaller than 0.5m, the height difference between two sides is controlled within 1.5m, and the vertical distance from the pipe orifice of the conveying hose to a pouring surface is controlled within 2.0m so as to prevent concrete segregation;
step 3) positioning the fixed person, and vibrating by using an inserted vibrator tamping mode to ensure the compactness of concrete; the outer knocking vibration of a wooden hammer mold and the tamping of an inserted vibrator are assisted below the arch camber line to inhibit the generation of bubbles on the surface of the concrete;
step 4), during tunnel lining capping, a steel pipe pressure injection method is adopted, concrete slump is selected, and the capping is performed through pressure injection from a pouring opening of the arch part;
step 5), removing the mold: removing the formwork when the strength of the concrete reaches more than 8.0 MPa; if the primary support is not stable, the concrete strength needs to reach more than 70% of the designed strength when the secondary lining is applied in advance;
and 6) after the form is removed, spraying high-pressure water on the surface of the concrete to reduce the hydration heat, and then carrying out later-stage maintenance.
The steel fiber concrete used in the construction method of the tunnel lining structure using the steel fiber concrete is characterized in that: the steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber.
The concrete components of the cement, the fly ash, the fine aggregate, the coarse aggregate and the steel fiber are as follows:
1) cement: ordinary Portland cement P.I 42.5 and P.I 52.5, the density of cement material is 3150Kg/m3；
2) Fly ash: the density is 2200Kg/m328d compressive strength ratio of 50%;
3) fine aggregate: river with water-collecting deviceThe apparent density of the sand is 2700Kg/m3Medium sand;
4) coarse aggregate: crushed stone with the diameter of 5-10 mm and the bulk density of 1600Kg/m3The apparent density is 2600 Kg/m;
5) steel fiber): the steel fiber is selected from any one of the three steel fibers in the table 1, and the parameters are as follows:
table 1: parameters of steel fiber
The steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber in the following mixing ratio: 442kg/m cement3160kg/m of fly ash3194kg/m of water3730kg/m of fine aggregate3726kg/m of coarse aggregate31.08 percent of water reducing agent and 40kg/m of steel fiber3。
The preparation method of the steel fiber concrete is characterized by comprising the following steps:
step 1) determining the dosage of each item according to the calculation of the mixing proportion;
step 2) adding the coarse aggregate and the steel fibers into a stirrer, and stirring for half a minute to uniformly distribute the steel fibers in the coarse aggregate;
step 3), adding cement and fine aggregate into the stirrer, stirring the coarse aggregate, the fine aggregate, the cement and the steel fiber under the condition of drying, and stirring for half a minute;
and 4) adding water with a preset proportion and stirring for three minutes to prepare the required steel fiber concrete.
The beneficial effects created by the invention are as follows:
1. the shear resistance of the concrete with the steel fiber replacing the stirrup is improved. The addition of steel fibers can change the failure mode of the component, especially from brittle shear failure to ductile bend failure.
2. Under the action of earthquake, the steel fiber concrete pipe sheet relieves stress concentration, improves the ductility of the structure, and makes more safe reserves for ultimate damage.
3. Under the action of strong shock, the steel fiber concrete pipe sheet has stronger energy consumption capability and has good ductility when reaching a limit state.
Detailed Description
A construction method of a tunnel lining structure using steel fiber concrete comprises the following steps:
step 1), manufacturing steel fiber concrete;
step 2) the steel fiber concrete is poured symmetrically in a layered and left-right alternating mode, the pouring thickness of each layer is smaller than 0.5m, the height difference between two sides is controlled within 1.5m, and the vertical distance from the pipe orifice of the conveying hose to a pouring surface is controlled within 2.0m so as to prevent concrete segregation;
step 3) positioning the fixed person, and vibrating by using an inserted vibrator tamping mode to ensure the compactness of concrete; the outer knocking vibration of a wooden hammer mold and the tamping of an inserted vibrator are assisted below the arch camber line to inhibit the generation of bubbles on the surface of the concrete;
step 4), during tunnel lining capping, a steel pipe pressure injection method is adopted, concrete slump is selected according to the specification, and capping is performed through pressure injection from a pouring opening of the arch part;
step 5), removing the mold: removing the formwork when the strength of the concrete reaches more than 8.0 MPa; if the primary support is not stable, when the secondary lining is constructed in advance, the strength of the concrete of the primary support needs to reach more than 70% of the designed strength;
and 6) after the form is removed, spraying high-pressure water on the surface of the concrete to reduce the hydration heat, and then carrying out later-stage curing for not less than 14 days.
The steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber.
The concrete components of the cement, the fly ash, the fine aggregate, the coarse aggregate and the steel fiber are as follows:
1) cement: ordinary Portland cement P.I 42.5 and P.I 52.5, the density of cement material is 3150Kg/m3；
2) Fly ash: the density is 2200Kg/m328d compressive strength ratio of 50%;
3) fine aggregate: the apparent density of the river sand is 2700Kg/m3Medium sand;
4) coarse aggregate: the diameter is 5 &Crushed stone with the thickness of 10mm and the bulk density of 1600Kg/m3The apparent density is 2600 Kg/m;
5) steel fiber: the steel fiber is selected from any one of the three steel fibers in the table 1, and the parameters are as follows:
table 1: parameters of steel fiber
The steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber in the following mixing ratio: 442kg/m cement3160kg/m of fly ash3194kg/m of water3730kg/m of fine aggregate3726kg/m of coarse aggregate31.08 percent of water reducing agent and 40kg/m of steel fiber3。
The preparation method of the steel fiber concrete comprises the following steps:
step 1) determining the dosage of each item according to the calculation of the mixing proportion;
step 2) adding the coarse aggregate and the steel fibers into a stirrer, and stirring for half a minute to uniformly distribute the steel fibers in the coarse aggregate;
step 3), adding cement and fine aggregate into the stirrer, stirring the coarse aggregate, the fine aggregate, the cement and the steel fiber under the condition of drying, and stirring for half a minute;
and 4) adding water with a preset proportion and stirring for three minutes to prepare the required steel fiber concrete.
Claims (2)
1. A construction method of a tunnel lining structure using steel fiber concrete is characterized by comprising the following steps:
step 1), manufacturing steel fiber concrete;
step 2) the steel fiber concrete is poured symmetrically in a layered and left-right alternating mode, the pouring thickness of each layer is smaller than 0.5m, the height difference between two sides is controlled within 1.5m, and the vertical distance from the pipe orifice of the conveying hose to a pouring surface is controlled within 2.0m so as to prevent concrete segregation;
step 3) positioning the fixed person, and vibrating by using an inserted vibrator tamping mode to ensure the compactness of concrete; the outer knocking vibration of a wooden hammer mold and the tamping of an inserted vibrator are assisted below the arch camber line to inhibit the generation of bubbles on the surface of the concrete;
step 4), during tunnel lining capping, a steel pipe pressure injection method is adopted, concrete slump is selected, and the capping is performed through pressure injection from a pouring opening of the arch part;
step 5), removing the mold: removing the formwork when the strength of the concrete reaches more than 8.0 MPa; if the primary support is not stable, the concrete strength should reach more than 70% of the designed strength when the secondary lining is applied in advance;
step 6), spraying high-pressure water on the surface of the concrete after removing the formwork, reducing the hydration heat, and then performing later-stage maintenance;
the steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber, and the concrete components of the cement, the fly ash, the fine aggregate, the coarse aggregate and the steel fiber are as follows:
1) cement: ordinary Portland cement P.I 42.5 and P.I 52.5, the density of cement material is 3150Kg/m3；
2) Fly ash: the density is 2200Kg/m328d compressive strength ratio of 50%;
3) fine aggregate: the apparent density of the river sand is 2700Kg/m3Medium sand;
4) coarse aggregate: crushed stone with the diameter of 5-10 mm and the bulk density of 1600Kg/m3The apparent density is 2600 Kg/m;
5) steel fiber: the steel fiber is selected from any one of the three steel fibers in the table 1, and the parameters are as follows:
table 1: parameters of steel fiber
The steel fiber concrete comprises cement, fly ash, fine aggregate, coarse aggregate and steel fiber in the following mixing ratio: 442kg/m cement3160kg/m of fly ash3194kg/m of water3730kg/m of fine aggregate3726kg/m of coarse aggregate31.08 percent of water reducing agent and 40kg/m of steel fiber3。
2. A method of making a steel fibre concrete as claimed in claim 1, characterised in that:
step 1) determining the dosage of each item according to the calculation of the mixing proportion;
step 2) adding the coarse aggregate and the steel fibers into a stirrer, and stirring for half a minute to uniformly distribute the steel fibers in the coarse aggregate;
step 3), adding cement and fine aggregate into the stirrer, stirring the coarse aggregate, the fine aggregate, the cement and the steel fiber under the condition of drying, and stirring for half a minute;
and 4) adding water with a preset proportion and stirring for three minutes to prepare the required steel fiber concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811208450.4A CN109209438B (en) | 2018-10-17 | 2018-10-17 | Construction method of tunnel lining structure by using steel fiber concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811208450.4A CN109209438B (en) | 2018-10-17 | 2018-10-17 | Construction method of tunnel lining structure by using steel fiber concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109209438A CN109209438A (en) | 2019-01-15 |
| CN109209438B true CN109209438B (en) | 2020-10-16 |
Family
ID=64980572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811208450.4A Active CN109209438B (en) | 2018-10-17 | 2018-10-17 | Construction method of tunnel lining structure by using steel fiber concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109209438B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109678429A (en) * | 2019-01-31 | 2019-04-26 | 青岛市地铁一号线有限公司 | A kind of preparation method of the no muscle steel fiber reinforced concrete segment in the tunnel TBM |
| CN110966022B (en) * | 2019-12-24 | 2022-03-11 | 中铁隧道局集团有限公司 | Railway tunnel lining construction method based on medium-high fluidity concrete |
| CN111119947A (en) * | 2020-03-03 | 2020-05-08 | 西南交通大学 | Construction method of fault-crossing open-cut subway tunnel |
| CN113213839B (en) * | 2021-05-14 | 2022-05-03 | 福建新华夏建工集团有限公司 | Concrete building member crack prevention and control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773988A (en) * | 2015-04-03 | 2015-07-15 | 东南大学 | Steam-curing-free early-strength steel fiber concrete pipe segment and preparation method thereof |
-
2018
- 2018-10-17 CN CN201811208450.4A patent/CN109209438B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109209438A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109209438B (en) | Construction method of tunnel lining structure by using steel fiber concrete | |
| CN105041336A (en) | Ultra-high performance hybrid fiber concrete shield segment and preparation method thereof | |
| CN107285693B (en) | A kind of preparation method of the cast-in-place concrete non-dismantling formwork with self-reparing capability | |
| CN101806096A (en) | Steel tube-concrete composite structure | |
| CN104499498B (en) | A kind of construction method of mass concrete building | |
| CN104452591B (en) | A kind of construction of cast-in-situ box-beam technique that is applied to science of bridge building | |
| CN106869503A (en) | A kind of concreting method of concrete heat-insulating curtain wall | |
| CN111196701B (en) | Polymer modified hybrid microfiber cementitious composites | |
| CN108409243B (en) | Constraint pipe cast-in-place pile for underground sulfate erosion environment and preparation method thereof | |
| EP3969428B1 (en) | Method for realizing dam or other massive structure by using the concrete mix design | |
| CN113202215A (en) | Full concrete outer wall construction method | |
| CN111485716A (en) | Application of waste concrete large aggregate in concrete structure construction | |
| CN110468744B (en) | Channel bridge reinforcement construction method | |
| CN102912893B (en) | High-ductility fiber concrete combination block masonry wall and construction method thereof | |
| CN102912982B (en) | Construction method of high-ductility fiber concrete floor cast-in-place layer | |
| CN107489431A (en) | A kind of large deformation country rock stage composite lining cutting | |
| CN109057822A (en) | A kind of concrete pipe sheet and preparation method thereof containing high active material | |
| CN111549690A (en) | Low-cost and high-performance rainwater box culvert combined structure and construction method thereof | |
| CN207211522U (en) | Assembled steel tube high-strength concrete column | |
| Choudhary et al. | Utilization of waste marble powder and silica fume in self-compacting concrete | |
| CN106747124A (en) | A kind of very-high performance mortar for building puzzle joint | |
| CN112479642A (en) | Novel green slip casting high performance post and construction form thereof | |
| Achalu et al. | A study on the effect of time duration by vibrating or tamping fresh concrete on the compressive strength of C-25 concrete | |
| Sathya et al. | Effect of Steel Fibres as Reinforcement in Self Compacting Concrete | |
| CN205088677U (en) | Low hollow side of prestressed concrete stake of high performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201023 Address after: No.10, Zhongshan Road, Hongshunli street, Hebei District, Tianjin Patentee after: The Third Railway Survey and Design Institute Co., Ltd Address before: Jinzhou City, Liaoning Province, 121000 Heping Road Linghe District No. 20 four Patentee before: JINZHOU RAILWAY SURVEY & DESIGN INSTITUTE Co.,Ltd. |
|
| TR01 | Transfer of patent right |