CN111231051A - Shield segment production process with corrosion resistance and shear resistance functions - Google Patents
Shield segment production process with corrosion resistance and shear resistance functions Download PDFInfo
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- CN111231051A CN111231051A CN202010181250.5A CN202010181250A CN111231051A CN 111231051 A CN111231051 A CN 111231051A CN 202010181250 A CN202010181250 A CN 202010181250A CN 111231051 A CN111231051 A CN 111231051A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 25
- 230000007797 corrosion Effects 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000012423 maintenance Methods 0.000 claims abstract description 19
- 238000005507 spraying Methods 0.000 claims abstract description 18
- 238000011049 filling Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000654 additive Substances 0.000 abstract description 7
- 230000000996 additive effect Effects 0.000 abstract description 7
- 238000005536 corrosion prevention Methods 0.000 abstract description 5
- 239000003755 preservative agent Substances 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- -1 salt ion Chemical class 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000006082 mold release agent Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229940044172 calcium formate Drugs 0.000 description 2
- 235000019255 calcium formate Nutrition 0.000 description 2
- 239000004281 calcium formate Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
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- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
-
- 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
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- 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
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/04—Discharging the shaped articles
- B28B13/06—Removing the shaped articles from moulds
-
- 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
- B28B23/0025—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with installation or service material, e.g. tubes for electricity or water
-
- 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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a shield segment production process with corrosion resistance and shear resistance, which comprises the following construction processes of mold preparation → mold release agent spraying → concrete filling → segment maintenance → segment mold release → segment maintenance, and is characterized in that: the method comprises the following five steps. The shield segment developed by the invention is beneficial to reducing the stress concentration when the bolt is contacted with concrete, protecting the concrete and improving the shear resistance function of the segment by sleeving PVC and other pipes in the bolt hole, the integral strength of the segment can be effectively increased when the segment is used by utilizing the steel reinforcement cage, the shear resistance of the segment is improved, the good performances of salt ion corrosion resistance, freeze-thaw cycle damage resistance, high permeation resistance and the like can be realized when the concrete is used by coating sulfate corrosion resistance preservatives on the surface of the de-molded segment, and the defects and the limitations of the traditional corrosion prevention method are fundamentally solved by using a new additive corrosion prevention method.
Description
Technical Field
The invention relates to the technical field of shield segment production, in particular to a shield segment production process with corrosion resistance and shear resistance functions.
Background
In order to solve the problem that underground rail traffic is developed in large cities in many times, at present, subway construction mainly adopts shield construction and shield construction, and a tunnel structure main body is assembled by a plurality of prefabricated shield segments.
The shield segment is a main assembly component for shield construction, is the innermost barrier of the tunnel and plays a role in resisting soil layer pressure, underground water pressure and some special loads, the shield segment is a permanent lining structure of the tunnel by a shield method, and the corrosion resistance and the shearing resistance of the shield segment are directly related to the overall quality and the safety of the tunnel, so that the waterproof performance and the durability of the tunnel are influenced.
Disclosure of Invention
The invention aims to provide a shield segment production process with corrosion resistance and shear resistance functions, and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a shield constructs section of jurisdiction production technology with corrosion-resistant function that shears, its construction flow has mould preparation → spraying release agent → concrete filling → section of jurisdiction maintenance → section of jurisdiction drawing of patterns → section of jurisdiction maintenance, its characterized in that: the method comprises the following five steps:
the method comprises the following steps: the preparation of the mould comprises the following steps: before the die assembly, checking all positions of the die, homogenizing a release agent, checking whether adhesive tapes at the connecting positions of a bottom die plate and a side die plate fall off or not, slightly pushing the side die plate inwards, screwing a bolt tightly by using a special tool in a balanced manner, then pushing the die to an inosculation mark, connecting the side die and an end die to the bolt, installing a fixing bolt of the bottom die and the side die, screwing by hand firstly, and then screwing the fixing bolt from the middle to the two ends by using the special tool in sequence;
step two: the spraying release agent is as follows: checking whether residual concrete exists on the inner surface of the mold, selecting a water-soluble release agent for spraying after confirmation, and spraying by using a mist sprayer and then uniformly coating by using a mop when spraying the release agent;
step three: filling the concrete: fixing the positions of the reinforcement cage and the PVC pipeline embedded part in the mold by using the plastic cushion block, filling prepared concrete into the mold for molding after fixing, wherein the concrete molding adopts pneumatic integral vibration, so that the content of gas in the concrete is reduced to the maximum extent;
step four: and (3) maintaining the duct pieces: the maintenance of the duct piece comprises maintenance before demolding and maintenance after demolding, the maintenance before demolding adopts maintenance, after the filling is finished, standing for 2 hours for heating and steam curing (the temperature is correspondingly adjusted according to the temperature when the duct piece is statically stopped), and water cooling is immediately adopted after demolding to avoid the water loss of the duct piece to generate crack;
step five: demolding of the duct piece: the horizontal lifting appliance is adopted for demoulding the shield segment, the side plates need to be firstly disassembled and the end mould needs to be disassembled after the intensity of the segment is greater than 20MPa in the demoulding process (the vacuum sucker is 15 MPa), and the whole mould disassembling process cannot be forcibly disassembled in order to avoid the phenomenon that the segment is damaged during mould disassembling.
Furthermore, after the folding work of each steel plate of the die is finished, quality detection personnel are arranged to detect and record the net width in the steel die.
Further, clear up the mould before carrying out the group mould, do not have remaining concrete in the requirement mould, use film and sponge cooperation clearance mould internal surface, do not allow to use ironware to clear away at the mould surface, after the clean up remaining concrete, follow mould internal surface clean up with debris.
Further, after the segment is produced, the type, the mark, the model, the production serial number, the production date and the inspection state of the segment are marked on the side surface of the segment and the upper right corner of the intrados, and the segment is placed on 3 hard square timbers of 0.1m multiplied by 0.1m for storage.
Furthermore, the temperature needs to be controlled in the curing process in the fourth step, the duct piece is subjected to three stages of standing, temperature rise, constant temperature and temperature reduction, the temperature rise and the speed rise need to be controlled at 15 ℃/h or below 15 ℃/h, and the upper temperature limit is 60 ℃; keeping the temperature for 2 hours, wherein the relative humidity needs to be maintained at 90% or above, and the temperature can be properly adjusted according to climate change when the temperature is kept constant; the upper limit of the cooling rate is 20 ℃/h, and the temperature is reduced to the same room temperature and maintained below 15 ℃.
Compared with the prior art, the invention has the beneficial effects that: according to the preparation method of the shield segment production process with the corrosion resistance and the shear resistance, PVC and other pipes are sleeved in the bolt holes, so that the stress concentration of the bolts and the concrete during contact is favorably reduced, the concrete is protected, the shear resistance function of the segment is improved, the strength of the whole segment can be effectively increased when the steel reinforcement cage is used, the shear resistance of the segment is improved, sulfate corrosion resistant preservatives are coated on the surface of the de-molded segment, the concrete can have good performances such as salt ion corrosion resistance, freeze-thaw cycle damage resistance, high permeation resistance and the like when the de-molded segment is used, and a novel additive corrosion prevention method is used, so that various defects and limitations of a traditional corrosion prevention method are fundamentally overcome.
Drawings
FIG. 1 is a schematic diagram showing the ratio of the shield segment production process with corrosion and shear resistance;
FIG. 2 is a precision requirement diagram of the mold with corrosion and shear resistance functions according to the present invention;
FIG. 3 is a ratio diagram of main components of the concrete with corrosion and shear resistance according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, an embodiment of the present invention: the utility model provides a shield constructs section of jurisdiction production technology with corrosion-resistant function that shears, its construction flow has mould preparation → spraying release agent → concrete filling → section of jurisdiction maintenance → section of jurisdiction drawing of patterns → section of jurisdiction maintenance, its characterized in that: the method comprises the following five steps:
the method comprises the following steps: the preparation of the mould comprises the following steps: before the die assembly, checking all positions of the die, homogenizing a release agent, checking whether adhesive tapes at the connecting positions of a bottom die plate and a side die plate fall off or not, slightly pushing the side die plate inwards, screwing a bolt tightly by using a special tool in a balanced manner, then pushing the die to an inosculation mark, connecting the side die and an end die to the bolt, installing a fixing bolt of the bottom die and the side die, screwing by hand firstly, and then screwing the fixing bolt from the middle to the two ends by using the special tool in sequence;
step two: the spraying release agent is as follows: checking whether residual concrete exists on the inner surface of the mold, selecting a water-soluble release agent for spraying after confirmation, and spraying by using a mist sprayer and then uniformly coating by using a mop when spraying the release agent;
step three: filling the concrete: the method comprises the steps of fixing the positions of a reinforcement cage and an embedded part of a PVC pipeline in a mould by using a plastic cushion block, checking the number of supports of a concrete protective layer of a reinforcement framework and the height of the protective layer, installing the number of the embedded part and the degree of attachment with the mould, filling prepared concrete into the mould for forming after fixing, wherein the concrete forming adopts pneumatic integral vibration to reduce the content of gas in the concrete to the maximum extent, but the vibration is over long to cause the layered segregation and surface laitance of the concrete, so that the concrete is fed in three layers during use, high-frequency vibration is adopted when the concrete is fed into the mould, then low-frequency vibration is adopted, low-frequency vibration is adopted after the feeding is finished, the vibration time and the vibration frequency of each time are adjusted according to the working performance of the concrete, the layered feeding vibration mode can stop the over-vibration layered segregation of the concrete, and simultaneously reduce the void ratio and the gas content of the concrete as much as possible, the quality problems of honeycomb pitted surface and the like on the surface of the duct piece are avoided, and PVC and other pipes are sleeved in the bolt holes, so that stress concentration when the bolts are in contact with concrete is reduced, the concrete is protected, and the shear resistance function of the duct piece is improved;
step four: and (3) maintaining the duct pieces: maintaining the duct piece, namely maintaining before demolding and maintaining after demolding, wherein maintaining is adopted before demolding, standing is carried out for 2 hours after filling is finished, heating and steam curing is carried out (corresponding adjustment is carried out according to respective temperature when standing is stopped), steam supply is stopped after specified steam curing time is reached, the steam curing canvas cover is partially opened, the steam curing cover is completely removed after the mold and the concrete are slowly and naturally cooled for one hour, demolding is allowed after the mold and the concrete are continuously cooled for half an hour, the surface temperature and the environmental temperature difference of the duct piece are not more than 20 ℃, the steam curing time can be properly adjusted according to the environmental temperature, water cooling is immediately adopted after demolding, and the phenomenon that the duct piece loses water and generates cracks is avoided;
step five: demolding of the duct piece: the horizontal lifting appliance is adopted for demoulding the shield segment, the side plates need to be firstly disassembled and the end mould needs to be disassembled after the intensity of the segment is more than 20MPa and demoulding (the vacuum sucker is 15 MPa), and the whole mould disassembling process cannot be forcibly disassembled in order to avoid the phenomenon that the segment is damaged during mould disassembling.
Furthermore, after the folding work of each steel plate of the die is finished, quality detection personnel are arranged to detect and record the size of the net width in the steel die, and the accuracy requirements of the die are shown in the following table.
| Serial number | Item | Tolerance deviation (mm) | |
| 1 | Width of steel die | ±0.2 | Ruler measuring |
| 2 | Height of |
0～2 | Ruler measuring |
| 3 | Arc and chord length of inner and outer diameter of steel mould | ±0.3.5 | Ruler measuring |
| 4 | Center distance between longitudinal inner core rod and inner ring core rod | ±0.2.5 | Ruler measuring |
| 5 | Longitudinal and circumferential core rod aperture | ±0.1 | Ruler measuring |
Further, the mould is cleaned before the mould is assembled, residual concrete does not exist in the mould, the inner surface of the mould is cleaned by matching of a rubber sheet and a sponge, an ironware is not allowed to be used for cleaning the surface of the mould, and impurities are cleaned from the inner surface of the mould after the residual concrete is cleaned.
Further, after the segment is produced, the type, the mark, the model, the production serial number, the production date and the inspection state of the segment are marked on the side surface of the segment and the upper right corner of the intrados, and the segment is placed on 3 hard square timbers of 0.1m multiplied by 0.1m for storage.
Furthermore, the temperature needs to be controlled in the curing process in the fourth step, the duct piece is subjected to three stages of standing, temperature rise, constant temperature and temperature reduction, the temperature rise and the speed rise need to be controlled at 15 ℃/h or below 15 ℃/h, and the upper temperature limit is 60 ℃; keeping the temperature for 2 hours, wherein the relative humidity needs to be maintained at 90% or above, and the temperature can be properly adjusted according to climate change when the temperature is kept constant; the upper limit of the cooling rate is 20 ℃/h, and the temperature is reduced to the same room temperature and maintained below 15 ℃.
Example 2
Firstly, a duct piece concrete preparation process:
the shield segment is a main assembly component for shield construction, is an innermost barrier of a tunnel and plays a role in resisting soil layer pressure, underground water pressure and some special loads, the shield segment is a permanent lining structure of the tunnel by a shield method, the quality of the shield segment directly relates to the overall quality and safety of the tunnel and influences the waterproof performance and the durability of the tunnel, high-strength impervious concrete is usually adopted for producing the shield segment so as to ensure reliable bearing performance and waterproof performance, and the production mainly utilizes a finished segment mould to form after concrete is poured in a sealing manner.
1. The concrete mainly comprises the following components: the method comprises the following steps:
the method comprises the following steps: preparing raw materials: the method comprises the following steps of (1) adopting sand in a II area with good gradation, wherein the fineness modulus of the sand is 2.3-3.0, the mud content is less than or equal to 1.5%, the mud block content is less than or equal to 1%, stones, mixing water, fly ash which is not lower than the II-grade technical requirement, a water reducing agent, a polycarboxylic acid high-efficiency water reducing agent and a calcium formate additive are adopted;
step two: raw material proportion: cement: fine aggregate: coarse aggregate: water: water reducing agent: fly ash: the additive is 380:715:1170:140:4.80:90:10(kg/m3), and in order to ensure the strength and durability of the segment concrete, the raw materials are selected to adopt low-alkaline materials except that indexes such as strength, gradation and the like must meet the requirements;
step three: mixing and stirring: adding raw materials of cement, coarse aggregate, fine aggregate and fly ash in a specified proportion into a concrete stirrer, fully stirring, adding water in a specified amount after uniformly stirring, fully stirring for 10-30 min, and adding a water reducing agent and an additive after completion, fully stirring and mixing until uniform;
step four: detection and filling: the concrete which is mixed and stirred uniformly is transported to the position of the mould by utilizing a transport vehicle for sampling and inspection, and the slump forming can be carried out after the inspection is qualified, and the slump is controlled within 55 mm-70 mm.
Step four: and (3) continuously spraying the sulfate corrosion resistant preservative by using a sealing spray gun after the duct piece is formed until the substrate thoroughly permeates, and spraying from bottom to top when the opposite surface is operated, so that the vertical flow length reaches 15-20 cm.
Furthermore, the calcium formate additive can accelerate the hardening speed of cement and shorten the setting time when in use, and particularly in winter construction, the cement can be prevented from excessively slow setting speed at low temperature and is quickly demoulded, so that the cement can be put into use with improved strength as soon as possible.
Furthermore, the content of mud in the continuously graded broken stone with the stone particle size of 5-25 mm is less than or equal to 1 percent, and the content of needle-shaped pieces is less than or equal to 15 percent.
To summarize: the surface of the shield segment after demoulding is coated with the sulfate-corrosion-resistant preservative, so that the concrete has good performances of salt ion corrosion resistance, freeze-thaw cycle damage resistance, high permeation resistance and the like when in use, and the novel method for preventing corrosion by using the additive fundamentally solves the defects and limitations of the traditional corrosion prevention method.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a shield constructs section of jurisdiction production technology with corrosion-resistant function that shears, its construction flow has mould preparation → spraying release agent → concrete filling → section of jurisdiction maintenance → section of jurisdiction drawing of patterns → section of jurisdiction maintenance, its characterized in that: the method comprises the following five steps:
the method comprises the following steps: the preparation of the mould comprises the following steps: before the die assembly, checking all positions of the die, homogenizing a release agent, checking whether adhesive tapes at the connecting positions of a bottom die plate and a side die plate fall off or not, slightly pushing the side die plate inwards, screwing a bolt tightly by using a special tool in a balanced manner, then pushing the die to an inosculation mark, connecting the side die and an end die to the bolt, installing a fixing bolt of the bottom die and the side die, screwing by hand firstly, and then screwing the fixing bolt from the middle to the two ends by using the special tool in sequence;
step two: the spraying release agent is as follows: checking whether residual concrete exists on the inner surface of the mold, selecting a water-soluble release agent for spraying after confirmation, and spraying by using a mist sprayer and then uniformly coating by using a mop when spraying the release agent;
step three: filling the concrete: fixing the positions of the reinforcement cage and the PVC pipeline embedded part in the mold by using the plastic cushion block, filling prepared concrete into the mold for molding after fixing, wherein the concrete molding adopts pneumatic integral vibration, so that the content of gas in the concrete is reduced to the maximum extent;
step four: and (3) maintaining the duct pieces: the maintenance of the duct piece comprises maintenance before demolding and maintenance after demolding, the maintenance before demolding adopts maintenance, after the filling is finished, standing for 2 hours for heating and steam curing (the temperature is correspondingly adjusted according to the temperature when the duct piece is statically stopped), and water cooling is immediately adopted after demolding to avoid the water loss of the duct piece to generate crack;
step five: demolding of the duct piece: the horizontal lifting appliance is adopted for demoulding the shield segment, the side plates need to be firstly disassembled and the end mould needs to be disassembled after the intensity of the segment is greater than 20MPa in the demoulding process (the vacuum sucker is 15 MPa), and the whole mould disassembling process cannot be forcibly disassembled in order to avoid the phenomenon that the segment is damaged during mould disassembling.
2. The shield segment production process with the corrosion and shear resistant functions of claim 1, which is characterized in that: after the folding work of each steel plate of the die is finished, quality detection personnel are arranged to detect and record the size of the net width in the steel die.
3. The shield segment production process with the corrosion and shear resistant functions of claim 1, which is characterized in that: the mould is cleaned before mould assembling, residual concrete does not exist in the mould, the inner surface of the mould is cleaned by matching rubber sheets and sponge, an ironware is not allowed to be used for cleaning the surface of the mould, and impurities are cleaned from the inner surface of the mould after the residual concrete is cleaned.
4. The shield segment production process with the corrosion and shear resistant functions of claim 1, which is characterized in that: after the segment is produced, the type, the mark, the model, the production serial number, the production date and the inspection state of the segment are marked on the side surface of the segment and the upper right corner of the inner cambered surface, and the segment is placed on 3 hard square timbers of 0.1m multiplied by 0.1m for storage.
5. The shield segment production process with the corrosion and shear resistant functions of claim 1, which is characterized in that: in the fourth maintenance process, the temperature needs to be controlled, the segments are subjected to standing still and then subjected to three stages of temperature rise, constant temperature and temperature reduction, the temperature rise and the speed rise need to be controlled at 15 ℃/h or below 15 ℃/h, and the upper temperature limit is 60 ℃; keeping the temperature for 2 hours, wherein the relative humidity needs to be maintained at 90% or above, and the temperature can be properly adjusted according to climate change when the temperature is kept constant; the upper limit of the cooling rate is 20 ℃/h, and the temperature is reduced to the same room temperature and maintained below 15 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010181250.5A CN111231051A (en) | 2020-03-16 | 2020-03-16 | Shield segment production process with corrosion resistance and shear resistance functions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010181250.5A CN111231051A (en) | 2020-03-16 | 2020-03-16 | Shield segment production process with corrosion resistance and shear resistance functions |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112248203A (en) * | 2020-09-16 | 2021-01-22 | 绍兴中亚工贸园有限公司 | Winter maintenance process for pipe sheet |
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| CN112248203A (en) * | 2020-09-16 | 2021-01-22 | 绍兴中亚工贸园有限公司 | Winter maintenance process for pipe sheet |
| CN113072392A (en) * | 2021-03-30 | 2021-07-06 | 南通铁建建设构件有限公司 | Remote intelligent high-strength anti-seepage shield segment maintenance method |
| CN116618966A (en) * | 2023-06-06 | 2023-08-22 | 中铁二十二局集团轨道工程有限公司 | High-quality shield segment production process |
| CN116618966B (en) * | 2023-06-06 | 2025-07-18 | 中铁二十二局集团轨道工程有限公司 | High-quality shield segment production process |
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