CN111720140A - Synthetic fiber reinforced concrete shield segment and preparation method thereof - Google Patents
Synthetic fiber reinforced concrete shield segment and preparation method thereof Download PDFInfo
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- 239000012209 synthetic fiber Substances 0.000 title claims abstract description 78
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000004568 cement Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 16
- 239000010881 fly ash Substances 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229920000098 polyolefin Polymers 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000011210 fiber-reinforced concrete Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 4
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- 239000011398 Portland cement Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
- B28C5/402—Methods
-
- 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
-
- 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
- E21D11/086—Methods of making concrete lining segments
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Lining And Supports For Tunnels (AREA)
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Abstract
The invention discloses a synthetic fiber reinforced concrete shield segment and a preparation method thereof, and relates to the field of shield segments. The duct piece has crack resistance, fatigue resistance and durability, can reduce the damage of the duct piece and the number of micro cracks of the duct piece during use, has simple construction process and low price, and can be used for large-scale batch production.
Description
Technical Field
The invention relates to the field of shield segments, in particular to a synthetic fiber reinforced concrete shield segment and a preparation method thereof.
Background
The shield segment generally adopts reinforced concrete segments, and although the segment has the characteristics of reliable mechanical strength, higher corrosion resistance, mature construction and manufacturing technology and the like, the problems of high local corner failure breakage rate, poor crack resistance, insufficient toughness, poor durability, poor fire resistance and the like occur in the use process.
At present, the problems of common reinforced concrete segments are solved by doping steel fibers, and the steel fiber concrete has better mechanical properties as a novel composite building material, but the steel fibers are relatively expensive in price and complex in segment preparation process, and the problems of poor durability and waste caused by incomplete exertion of the mechanical properties of the steel fibers due to the exposed rusty expansion effect of the steel fibers exist. For example, the invention of the patent named as 'high-performance fiber concrete suitable for large-caliber subway segments and application thereof' (application number is 201310440761.4) discloses a high-performance fiber concrete suitable for large-caliber subway segments, and the doped material is cold-drawn end hook-shaped steel fibers, so that the tensile property, bending resistance, impact toughness and other properties of the concrete can be improved, but the problem of poor durability caused by exposure of the steel fibers cannot be solved, the cost is obviously increased due to large steel consumption, the construction is inconvenient due to large segment mass, and the preparation process is more complex.
The high-strength and high-toughness synthetic fibers are adopted to replace steel fibers as doping materials, the mechanical property of the concrete can be obviously improved, the synthetic fibers are easy to disperse in a concrete mixture and have good bonding property with hardened concrete, the high-temperature melting can be realized so as to improve the anti-explosion performance of the concrete, meanwhile, the problem of steel fiber rust swelling is avoided, the construction process is relatively simple, and the price is relatively low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a synthetic fiber reinforced concrete shield segment and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a synthetic fiber reinforced concrete shield constructs section of jurisdiction, the section of jurisdiction includes section of jurisdiction framework of steel reinforcement, section of jurisdiction framework of steel reinforcement is filled by synthetic fiber concrete, the hole for hoist has been preset to the bottom of section of jurisdiction, the bolt hole has been preset respectively at the both ends of section of jurisdiction perpendicular to cross section.
Preferably, the duct piece is in the shape of a circular arch, and the duct piece is integrally cast and molded.
Preferably, the synthetic fiber concrete comprises cement, sand, crushed stone, fly ash, an additive, synthetic fiber and water mixed in proportion.
Preferably, the synthetic fibers comprise high strength, high tenacity polyolefin fibers.
Preferably, the admixture comprises a low-chlorine, low-alkali and high-efficiency water reducing agent.
A preparation method of a synthetic fiber reinforced concrete shield segment comprises the following steps:
s1: selecting a material of synthetic fiber reinforced concrete, wherein the material of the synthetic fiber reinforced concrete comprises: 365-375 parts of cement, 780-800 parts of sand, 1025-1055 parts of crushed stone, 95-100 parts of fly ash, 8-9 parts of admixture and 9-10 parts of synthetic fiber, and then adding water and the admixture according to the water-cement ratio of 0.32-0.33 to mix the mixture materials and uniformly vibrate the mixture materials to prepare the synthetic fiber reinforced concrete;
s2: processing and manufacturing a segment steel reinforcement framework, placing the segment steel reinforcement framework in a special mold after the segment steel reinforcement framework is manufactured, injecting the synthetic fiber reinforced concrete in the S1 into the mold, sealing, vibrating and compacting the synthetic fiber reinforced concrete in the mold, and pouring and forming at one time to prepare a segment;
s3: and (4) carrying out natural curing for 8 hours after the segment is manufactured, and then demoulding for standard curing.
Preferably, in the step of preparing the synthetic fiber reinforced concrete in S1, the crushed stone and 2/3 synthetic fibers are uniformly added into a stirring device, sand is added and dry-mixed for 40 seconds, then the cement, the fly ash and the rest of 1/3 synthetic fibers are added into the stirring device and dry-mixed for 20 seconds, and then water and an additive are added according to the water-to-cement ratio of S1, so as to stir the concrete mixture.
Preferably, the mixing time of the concrete mixture is prolonged by 40 to 50 seconds compared with that of the common concrete.
Preferably, the sealing vibration in S2 is performed by high-frequency low-amplitude vibration for 120 seconds and 140 seconds.
The invention has the beneficial effects that: the synthetic fiber reinforced concrete shield segment prepared by the method can greatly reduce segment damage and segment micro-crack quantity, and has higher tensile strength, bending strength and pulling strength; compared with the common concrete segment, the synthetic fiber reinforced concrete shield segment has excellent impact resistance, shear resistance and deformation performance, and also has excellent post-crack strength and crack and fatigue resistance; compared with a steel fiber concrete shield segment, the synthetic fiber reinforced concrete shield segment can avoid the problem of steel fiber rust expansion, obviously improves the durability of the segment, can be melted at high temperature so as to improve the thermal expansion space of concrete, has good high-temperature burst resistance, is easy to obtain raw materials for manufacturing the synthetic fiber reinforced concrete shield segment, is simple and convenient in preparation process, strong in construction operability, can be produced in large scale and batch, and has wide application development prospect.
Drawings
FIG. 1 is a schematic structural diagram of a synthetic fiber reinforced concrete shield segment according to the present invention;
FIG. 2 is a schematic flow chart of a synthetic fiber reinforced concrete shield segment and a method for manufacturing the same according to the present invention;
in the figure, 1-segment steel reinforcement framework, 2-hoisting holes, 3-bolt holes and 4-polyolefin fibers.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in figure 1, a synthetic fiber reinforced concrete shield segment, the segment comprises a segment steel bar framework 1, the segment steel bar framework 1 is filled with synthetic fiber concrete, a hoisting hole 2 is preset at the bottom end of the segment, and bolt holes 3 are preset at two ends of the segment perpendicular to the cross section respectively. This section of jurisdiction is the dome setting simultaneously, and the shaping is pour to section of jurisdiction an organic whole, satisfies the support requirement of shield construction, and can reduce the destruction of the stress concentration of upper portion support load to the section of jurisdiction through the design requirement of section of jurisdiction, has increased the section of jurisdiction and has supported life, reduces the possibility that the incident takes place. The synthetic fiber concrete for preparing the duct piece comprises cement, sand, broken stone, fly ash, an additive, synthetic fiber and water which are mixed according to a proportion, wherein the cement is low-alkali portland cement or low-alkali ordinary portland cement (the alkali content is less than or equal to 0.6%) which meets the GB175 specification and is not less than P.O.42.5 grade; the sand is selected from clean medium sand, the fineness modulus is more than 2.5, and the mud content is less than 3%; mountain gravel with the maximum aggregate particle size not greater than 25mm is selected as the gravel, the grading is continuous, and the mud content is less than 1%; the fly ash is grade I fly ash which meets the GB1596 standard; the additive is low-chlorine low-alkali high-efficiency water reducing agent; the synthetic fiber is polyolefin fiber 4 with high strength and high toughness.
Further, as shown in fig. 2, a process for manufacturing the composite fiber reinforced concrete shield segment includes selecting a material of the composite fiber reinforced concrete, wherein the material of the composite fiber reinforced concrete is prepared by adding water into 365-375 parts by weight of cement, 780-800 parts by weight of sand, 1025-1055 parts by weight of gravel, 95-100 parts by weight of fly ash, 8-9 parts by weight of water reducer and 9-10 parts by weight of synthetic fiber according to a water-to-cement ratio of 0.30-0.32; the synthetic fibers are doped by adopting an external doping method, the weight of the synthetic fibers can be ignored relative to the self weight of the concrete, the using amount of reinforcing steel bars is reduced, and the weight of the duct piece is reduced; the synthetic fiber is high-strength and high-toughness polyolefin fiber, the length is 48-50mm, the equivalent diameter is 0.7mm, the number of fibers per kilogram is 60000-63000, the initial modulus is 5-7GPa, the tensile strength is more than 500MPa, and the melting point is more than 130 ℃; the cement is low-alkali portland cement or low-alkali ordinary portland cement (the alkali content is less than or equal to 0.6%) which meets the GB175 specification and is not lower than the P.O.42.5 grade; the sand is selected from clean medium sand, the fineness modulus is more than 2.5, and the mud content is less than 3%; mountain gravel with the maximum aggregate particle size not greater than 25mm is selected as the gravel, the grading is continuous, and the mud content is less than 1%; the fly ash is grade I fly ash which meets the GB1596 standard; the water reducing agent is low-chlorine low-alkali high-efficiency water reducing agent.
Further, a preferred material selection method is selected:
the cement is 425 ordinary portland cement with the specific surface area of 330m2The initial setting time is 160min, the final setting time is 350min, the 3d compressive strength is 19MPa, the 28d compressive strength is 45MPa, the 3d flexural strength is 4MPa, and the 28d flexural strength is 8 MPa; the crushed stone is selected from 5 mm-25 mm continuous graded crushed stone, the mud content is 0.6 percent, and the sulfide and sulfate content is 0.7 percent; the sand is local river sand with apparent density of 2630kg/m3Bulk density 1390kg/m32.4 percent of mud content, 0.8 percent of mud block content, 0.004 percent of chloride ion content and 2.3 percent of fineness modulus; adopting I-grade fly ash; adopts a polycarboxylic acid type water reducing agent with solid content of 13.27 percent and density of 1.112g/cm3The total alkali content is 2.3, the pH value is 4.6, the chloride ion content is 0.03%, the water reduction rate is 21%, the bleeding rate is 0%, the gas content is 2.8%, and tap water is used for mixing. The relevant data are as follows:
1. the following examples use polyolefin fibers of the TamFib SP48 type produced by Norman dellite and have the performance criteria shown in Table 1:
TABLE 1 polyolefin fiber Performance index Table
| Material properties | Index (I) | Unit of |
| Type of material | Polyolefins | |
| Length of fiber | 48 | mm |
| Equivalent diameter | 0.7 | mm |
| Amount of fiber per kilogram | 62500 | |
| Density of | 0.91 | g/cm3 |
| Melting Point | 130 | ℃ |
| Tensile strength | 550 | MPa |
| Young's modulus | 7.0 | GPa |
2. The synthetic fiber reinforced concrete raw materials and the mixing ratio are shown in table 2:
TABLE 2 blend ratio of synthetic fiber reinforced concrete
Further, the preparation steps of the synthetic fiber reinforced concrete shield segment are as follows:
the method comprises the following steps: weighing cement, sand, broken stone, fly ash, a water reducing agent and synthetic fiber according to the weight part ratio, adding the raw materials by adopting a fractional addition process and uniformly stirring to prepare the synthetic fiber reinforced concrete in order to ensure that the fiber is fully dispersed; in the preparation process, firstly, the coarse aggregate (gravel) and the 2/3 synthetic fibers are uniformly added into a stirring device in batches, the fine aggregate (sand) is added and dry-mixed for 40 seconds, then the cement, the fly ash and the rest 1/3 synthetic fibers are added into the stirring device and dry-mixed for 20 seconds, then the water and the admixture are added according to the water-to-cement ratio of 0.30-0.32, the mixture materials are mixed and uniformly vibrated, and the synthetic fiber reinforced concrete is prepared.
Step two: processing and manufacturing a duct piece steel bar framework, wherein main bars of the duct piece steel bar framework are HRB400 steel bars with the diameter of 20mm, and the distance between the main bars is 150 mm; placing the segment-bound reinforcement cage in a special mould, then injecting the prepared synthetic fiber reinforced concrete in the step one into the mould and sealing, and vibrating the synthetic fiber reinforced concrete in the mould tightly, wherein the vibration adopts high-frequency low-amplitude vibration for 120 seconds, so that the segment is prepared by one-step pouring forming;
step three: and (4) carrying out natural curing for 8 hours after the segment is manufactured, and then demoulding for standard curing.
If continuous preparation is needed, after demolding in the third step, cleaning a special mold for repeated reuse, and then repeatedly preparing the synthetic fiber reinforced concrete shield segment according to the first step, the second step and the third step of the embodiment until the requirement is met.
The synthetic fiber reinforced concrete shield segment prepared by the first step, the second step and the third step has the following characteristics:
1. the pulling resistance of the segment hoisting hole is more than 170 kN;
2. in a segment impermeability test, the water pressure is loaded to 1.2MPa and lasts for 2 hours, and no water seepage phenomenon exists;
3. the fiber concrete has no cracks in the early age (within 24 h), and compared with the common concrete segment after 28 days, the micro cracks are reduced by about 50 percent;
4. in a bending test, the synthetic fiber reinforced concrete shield segment has cracks at the first time of 150kN, and the bearing load can reach 180kN when the width of the cracks is 0.2 mm.
The synthetic fiber reinforced concrete shield segment prepared by the method can greatly reduce segment damage and segment microcrack quantity, and has higher tensile strength, bending strength and pulling strength; compared with the common concrete segment, the synthetic fiber reinforced concrete shield segment has excellent impact resistance, shear resistance and deformation performance, and also has excellent post-crack strength and crack and fatigue resistance; compared with a steel fiber concrete shield segment, the synthetic fiber reinforced concrete shield segment can avoid the problem of steel fiber rust expansion, obviously improve the durability of the segment, and the synthetic fiber can be melted at high temperature so as to improve the thermal expansion space of concrete, and has good high-temperature burst resistance.
Furthermore, in the whole embodiment process, the mixing time of the synthetic fiber reinforced concrete in the step one is prolonged by 40-50s compared with that of the common concrete, so that the synthetic fibers in the mixture are fully and uniformly mixed, and the internal binding power of the concrete is enhanced; the prepared synthetic fiber reinforced concrete needs to be subjected to detection on slump, cohesiveness, water retention, workability and the like of the synthetic fiber reinforced concrete, and the next step of pouring construction can be carried out after various indexes are qualified; in the second step, the vibration is carried out by adopting high-frequency low-amplitude vibration for 120 seconds, so that the synthetic fiber reinforced concrete fills the whole segment steel reinforcement framework, and meanwhile, bubbles in the synthetic fiber reinforced concrete are reduced, so that the vibrated synthetic fiber reinforced concrete is more compact and better in quality, and meanwhile, the positions of the hoisting holes 2 and the bolt holes 3 which need to be reserved are designed in advance for the special mould in the second step, so that the concrete can be poured and formed at one time; and in the third step, the aim of performing standard maintenance on the demoulding of the duct piece without steam maintenance is to simplify the process and save the cost. Therefore, the performance of the synthetic fiber reinforced concrete shield segment is obviously superior to that of a common reinforced concrete segment in the prior art, the raw materials are easy to obtain, the production cost is low, the preparation process is simple, large-scale production can be carried out, and the popularization and application values are extremely high.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a synthetic fiber reinforced concrete shield constructs section of jurisdiction which characterized in that, the section of jurisdiction includes section of jurisdiction framework of steel reinforcement (1), section of jurisdiction framework of steel reinforcement (1) is filled by synthetic fiber concrete, hole for hoist (2) have been preset to the bottom of section of jurisdiction, bolt hole (3) have been preset respectively to the both ends of section of jurisdiction perpendicular to cross section.
2. The reinforced composite fiber concrete shield segment according to claim 1, wherein the segment is in a dome shape, and the segment is integrally cast.
3. The composite fiber reinforced concrete shield segment according to claim 1, wherein the composite fiber concrete comprises cement, sand, crushed stone, fly ash, an additive, synthetic fibers and water mixed in proportion.
4. A synthetic fibre reinforced concrete shield segment according to claim 3, characterized in that said synthetic fibres comprise high strength, high tenacity polyolefin fibres (4).
5. The synthetic fiber reinforced concrete shield segment of claim 3, wherein the admixture comprises a low-chlorine, low-alkali and high-efficiency water reducing agent.
6. The method for preparing the synthetic fiber reinforced concrete shield segment according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s1: selecting a material of synthetic fiber reinforced concrete, wherein the material of the synthetic fiber reinforced concrete comprises: 365-375 parts of cement, 780-800 parts of sand, 1025-1055 parts of crushed stone, 95-100 parts of fly ash, 8-9 parts of admixture and 9-10 parts of synthetic fiber, and then adding water and the admixture according to the water-cement ratio of 0.32-0.33 to mix the mixture materials and uniformly vibrate the mixture materials to prepare the synthetic fiber reinforced concrete;
s2: processing and manufacturing a segment steel reinforcement framework, placing the segment steel reinforcement framework in a special mold after the segment steel reinforcement framework is manufactured, injecting the synthetic fiber reinforced concrete in the S1 into the mold, sealing, vibrating and compacting the synthetic fiber reinforced concrete in the mold, and pouring and forming at one time to prepare a segment;
s3: and (4) carrying out natural curing for 8 hours after the segment is manufactured, and then demoulding for standard curing.
7. The method for preparing a synthetic fiber reinforced concrete shield segment according to claim 6, wherein in the step of preparing synthetic fiber reinforced concrete in S1, the crushed stone and 2/3 synthetic fibers are uniformly added into a stirring device, sand is added and dry-mixed for 40 seconds, then the cement, the fly ash and the rest of 1/3 synthetic fibers are added into the stirring device and dry-mixed for 20 seconds, and then water and additives are added according to the water-to-cement ratio of S1 to stir the concrete mixture.
8. The method for preparing a synthetic fiber reinforced concrete shield segment according to claim 7, wherein the mixing time of the concrete mixture is prolonged by 40-50s compared with that of ordinary concrete.
9. The method as claimed in claim 6, wherein the sealing vibration in S2 is performed by high frequency and low amplitude vibration for 120-140 seconds.
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