CN103924533A - Safety rail transit platform production system and safety rail transit platform production method - Google Patents
Safety rail transit platform production system and safety rail transit platform production method Download PDFInfo
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Abstract
The invention provides a safety rail transit platform production method. The safety rail transit platform production method includes: manufacturing platform components; placing a plurality of manufactured platform components into proper positions, pouring a platform body in place end enabling the platform body to be flushed with the platform components, wherein the step of manufacturing the platform components includes: coating releasing agents in forming dies for the platform components; manufacturing and detecting a steel reinforced skeleton frames for the anti-corrosion concrete platform components of a safety rail transit platform; loading the steel reinforced skeleton frames into the forming dies for the platform components; preparing anti-corrosion concrete and pouring the prepared anti-corrosion concrete into the forming dies; enabling the poured anti-corrosion concrete to shape via a vibrating technique; trowelling upper openings; placing the anti-corrosion concrete formed by pouring and the dies into maintaining work positions; subjecting the anti-corrosion concrete formed by pouring and the dies to steaming; demoulding and transferring the cured platform components into a storage yard for natural maintenance.
Description
Technical field
The present invention relates to track traffic safety station field, particularly, relate to a kind of corrosion-resistant prefabricated assembled track traffic safety station production system and production method thereof.
Background technology
The cast in situs mode generally adopting in the construction of track (railway, subway, light rail etc.) traffic platform at present, manual assembling reinforcement skeleton, cast-in-place concrete; The spacing of track and platform is nearer, without hiding (escape) space; In cast in situs construction, generally do not take anti-corrosion measure.
And existing platform construction environment is poor, the cycle is long, work efficiency is low; Because the spacing of track and platform is nearer, when locomotive is sailed, railway maintenance staff or the passenger that falls into track, without hiding (escape) space, often cause human casualty accident; Without anti-corrosion measure, durability is poor, affects application life.
Summary of the invention
For overcoming existing defect, the present invention proposes a kind of track traffic safety station production method and implements the method track traffic safety station production system used.
According to an aspect of the present invention, propose a kind of method of cast in situs track traffic safety station, said method comprising the steps of: made platform member; With cast in situs platform main body after multiple platform members of making are set to appropriate position, platform main body is flushed with described platform member, wherein make platform member and comprise the following steps: brushing release agent in platform component molding mold; Make cage of reinforcement the inspection of the platform member of corrosion resistant concrete rail traffic platform; The cage of reinforcement of described platform member is packed in described platform element mold; To prepare corrosion resistant concrete and the corrosion resistant concrete preparing is poured in described mould; Adopt vibratory process to make corrosion resistant concrete moulding by casting; Complete suitable for reading floating; The corrosion resistant concrete of moulding by casting is put into maintenance station together with described mould; The corrosion resistant concrete of moulding by casting is carried out to steam-cured processing together with described mould; Proceed to stockyard natural curing with the demoulding and by curing platform member.
Preferably, described corrosion resistant concrete is alkali-activated slag fly ash concrete.
Preferably, described corrosion-resistant prefabricated assembled concrete rail traffic platform is the platform that corrosion-resistant medium scope is pH value 2.0-13.0.
Preferably, described stream curing temperature is controlled at 50-100 DEG C, and heating rate is controlled at 20-25 DEG C/h, and whole stream curing process time is controlled at 6-8h.
Preferably, described concrete is strength grade >=C35, prefabricated units design bearing capacity >=4.0kPa.
The corrosion resistant concrete of preferably, building described platform main body is identical with the corrosion resistant concrete of making described platform member.
Preferably, comprise and make the recess of multiple platform members in the face of track setting in the step that multiple platform members are arranged on to appropriate position.
According to a further aspect in the invention, a kind of this track traffic safety station production method track traffic safety station production system used of implementing has been proposed, described system comprises: platform member production system, and described platform member production system is for the production of platform member, with platform main body production system, described platform main body production system is adjacent at the on-the-spot installation position of described track traffic safety station with the platform member of having produced, wherein said platform member production system comprises: 1st district, 2nd district, 3rd district, 4th district, 5th district, 6th district, 7th district, 8th district, 9th district, 10 He11 district of districts, 1st district is connected with 2nd district by the first horizontal transmission device, 2nd district are connected with 3rd district by the first transmission device, 3rd district are connected with 4th district by the first pusher, 4th district are connected with 5th district by the second horizontal transmission device, 5th district are connected with 6th district by the second transmission device, 6th district are connected with 7th district by the second transmission device, 7th district are connected with 8th district by the second transmission device, 8th district are connected with 9th district by the second pusher, 9th district are connected by the first horizontal transmission device Yu10 district, 10 Yu11 district of districts are connected, He11 district is connected with 1st district, thereby make described platform member production system form loop production system.
Preferably, platform member to be produced completes feeding, moulding, vibratory process in 1st district; By the first horizontal transmission device, the platform member of making is transported to 2nd district together with described platform component molding mold, completes floating operation suitable for reading in 2nd district, then be transported to 3rd district; Described 3rd district, for ferry-boat district, are pushed to together with mould the platform member of making 4th district from 3rd district by the first pusher, complete quiet shut-down order in 4th district; In order the platform member of making is transported to 5th district, 6th district, 7th district successively together with mould by 4th district by the second horizontal transmission device, in 5th district, 6th district, 7th district complete respectively intensification, constant temperature, temperature-fall period in goods maintenance processes; After 7th district complete cooling process, be transported to 8th district; Described 8th district, for another ferry-boat district, are pushed to 9th district by the platform member after maintenance together with mould by the second pusher in 8th district; Complete form removal technique in 9th district; After 9th district complete form removal, platform member by crane gear handling to finished product stockyard, mould by the first horizontal transmission device be transported to 10th district, 11st district complete respectively mould, press setter skill clearly; Mould sends back to 1st district by the first horizontal transmission device, thereby forms an end to end loop production streamline.
Preferably, the platform member of making by described platform member production system is sent to described rail traffic platform place, described platform member has recess in a side, and the female portion settles towards track, and the sidepiece relative with the female portion of described platform member and described platform main body production system are adjacent, thereby carry out building of platform main body at track traffic safety platform scene.
Brief description of the drawings
Fig. 1 is according to the plan view of the track traffic safety station production system of the embodiment of the present invention.
Fig. 2 be in Fig. 1 according to the plan view of the platform member production system of the track traffic safety station of the embodiment of the present invention.
Fig. 3 is according to the schematic perspective view of the track traffic safety station of the embodiment of the present invention.
Fig. 4 is according to the perspective view of the platform member of the track traffic safety station of the embodiment of the present invention.
Fig. 5 A-5F is according to the sectional view of the platform member of the track traffic safety station of the embodiment of the present invention.
Fig. 6 produces according to the flow chart of the traffic platform of the embodiment of the present invention.
Detailed description of the invention
Structure below in conjunction with the drawings and specific embodiments to rail mounted traffic safety platform provided by the invention, system and the production method of producing this rail mounted traffic platform are described in detail.
Fig. 1 shows according to the production system of the track traffic safety station of the embodiment of the present invention.As shown in Figure 1, track traffic safety production system comprises platform member production system 1000 and settles the adjacent platform main body production system 2000 of field position with platform member.Particularly, the platform member of producing in platform member production system 1000 places is sent to the on-the-spot installation position of track traffic safety station 3000 places, and platform main body production system 2000 is adjacent with this scene installation position.
Fig. 2 has shown the concrete structure of the platform member production system 1000 described in Fig. 1.As shown in Figure 2, platform member production system 1000 comprises 1st district, 2nd district, 3rd district, 4th district, 5th district, 6th district, 7th district, 8th district, 9th district, 10th district, He11Qu.Particularly, 1st district is connected with 2nd district by the first horizontal transmission device, 2nd district are connected with 3rd district by the first transmission device, 3rd district are connected with 4th district by the first pusher, 4th district are connected with 5th district by the second horizontal transmission device, 5th district are connected with 6th district by the second transmission device, 6th district are connected with 7th district by the second transmission device, 7th district are connected with 8th district by the second transmission device, 8th district are connected with 9th district by the second pusher, 9th district are connected by the first horizontal transmission device Yu10 district, 10 Yu11 district of districts are connected, He11 district is connected with 1st district, like this, whole platform member production system itself can form a loop production system.
Concrete platform member production procedure as shown in Figure 2, completes feeding, moulding, vibratory process in 1st district; By the first horizontal transmission device, product is transported to 2nd district together with moulding form, completes floating operation suitable for reading in 2nd district, then be transported to 3rd district; 3rd district, for ferry-boat district, are pushed to together with mould the platform member of making 4th district from 3rd district by the first pusher, complete quiet shut-down order in 4th district; In order the platform member of making is transported to 5th district, 6th district, 7th district successively together with mould by 4th district by the second horizontal transmission device, in 5th district, 6th district, 7th district complete respectively intensification, constant temperature, temperature-fall period in goods maintenance processes; After 7th district complete cooling process, be transported to 8th district; 8th district, for another ferry-boat district, are pushed to 9th district by the platform member after maintenance together with mould by the second pusher in 8th district; Complete form removal technique in 9th district; After 9th district complete form removal, platform member by crane gear handling to finished product stockyard, mould by the first horizontal transmission device be transported to 10th district, 11st district complete respectively mould, press setter skill clearly; Mould sends back to 1st district by the first horizontal transmission device, thereby forms an end to end loop production streamline.
The concrete production stage of platform member is as follows: first, the platform component molding mold of prefabricated corrosion resistant concrete rail traffic platform is cleared up to (in these Jiang 10th districts, carrying out); Then, brushing release agent (carrying out in 10 district) in described inner mold; Afterwards, make cage of reinforcement the inspection of the platform member of corrosion resistant concrete rail traffic platform; Then the cage of reinforcement of described platform member is packed in described mould and (in 11 district, carried out); Then the mould that cage of reinforcement is housed being transported to 1st district prepares to build; Before building, first to prepare corrosion resistant concrete (carrying out in 1st district); Then the corrosion resistant concrete preparing is poured in the mould that cage of reinforcement is housed and (is carried out in 1st district); Afterwards, adopt vibratory process to make corrosion resistant concrete moulding by casting (carrying out in 1st district); Then the member of building and mould thereof are transported to 2nd district together and carry out floating operation suitable for reading (carrying out in 2nd district) in 1st district; Afterwards, the corrosion resistant concrete of moulding by casting is put into maintenance station (carrying out in 3,4 districts) together with described mould; Then, the corrosion resistant concrete of moulding by casting is carried out to steam-cured processing (carrying out in 5,6,7 districts) together with described mould; With carry out demoulding processing in 9th district and curing platform member proceeded to stockyard natural curing.
Fig. 3 shows according to the schematic perspective view of the track traffic safety station of the embodiment of the present invention.As shown in Figure 3, track traffic safety station 100 is mainly made up of multiple platform members 110 and platform main body 120 two parts, and wherein platform member 110 and platform main body 120 in height with on width all flush.
Below, specifically describe the structure of platform member 110 with reference to Fig. 4-5F.
Platform member 110 is the members with approximate U-shaped cross-section, and its side towards track has the recess inwardly concaving.Can be according to individual layer or multilayer arrangement of reinforcement being set along platform member in figure, can all select according to actual needs presstressed reinforcing steel or presstressed reinforcing steel and non-prestressing tendon collocation to use.
Particularly, this arrangement of reinforcement can be the form of ribs, for example, shown in Fig. 4-5F, can be provided with at least one ribs A to the bottom transverse of recess across ground from the top of recess at the inner surface of recess, or not be provided with ribs A.
Fig. 5 A is that sectional view, Fig. 5 B without the platform member of ribs are that sectional view, Fig. 5 C and the 5D with the platform member of a ribs is that sectional view, Fig. 5 E and the 5F with the platform member of two ribs is the sectional view with the platform member of 3 ribs.As shown in Fig. 5 A-5F, the quantity of ribs can be 1 or 2 or many, or is not provided with ribs.In the time that 1 ribs is set, ribs can be arranged on to the centre position place of recess; In the time that 2 ribs are set, 2 ribs can be arranged on symmetrically to the two ends of recess or the position near two ends; In the time that 3 and above ribs are set, ribs is uniformly distributed, and 2 ribs of outermost can be arranged on symmetrically to the two ends of recess or the position near two ends.In figure, only show the situation that 1-3 bar ribs is set and ribs is not set, but the present invention is not limited to this, the quantity of ribs can increase or reduce according to the needed passenger flow load bearing requirements of platform, and concrete quantity can be selected to adopt according to different passenger flow load bearing requirements by designer.
In addition, can also interface be set at the sidepiece of platform member, closely be bonded together thereby multiple platform members are agreed with each other.Interface can be the top interface that is correspondingly arranged on the tip position place of the sidepiece of platform member, be arranged on the middle part interface at medium position place or be arranged on the turning interface at corner location place, and two adjacent platform members can closely be bonded together by these interfaces.
Interface can be configured to arc, the concavo-convex bell and spigot form such as trapezoidal, but the present invention is not limited to this, and interface also can be configured to other shape, as long as two adjacent interfaces can agree with each other and be bonded together.It is mainly assembled in order to facilitate adopting bell socket, and makes all platforms keep not (upper and lower, front and back) dislocation of sustained height, makes multi-form interface corresponding one by one by shape.
In the present invention, as shown in Figure 3, multiple platform members agree with each other and are closely bonded together, its recess also communicates with each other, thereby after assembled laying, the recessed portion of whole piece platform all can be used as safety exit space, does not need to reset other fixing safety exit position, and this is to distinguish with the maximum of existing plane platform.
Fig. 2 has shown the platform member production system of track traffic safety station.As shown in Figure 2, this production system comprises 1st district, 2nd district, 3rd district, 4th district, 5th district, 6th district, 7th district, 8th district, 9th district, 10th district, He11Qu.Particularly, 1st district is connected with 2nd district by the first horizontal transmission device, 2nd district are connected with 3rd district by the first transmission device, 3rd district are connected with 4th district by the first pusher, 4th district are connected with 5th district by the second horizontal transmission device, 5th district are connected with 6th district by the second transmission device, 6th district are connected with 7th district by the second transmission device, 7th district are connected with 8th district by the second transmission device, 8th district are connected with 9th district by the second pusher, 9th district are connected by the first horizontal transmission device Yu10 district, 10 Yu11 district of districts are connected, He11 district is connected with 1st district, like this, whole production system forms a loop production system.
Concrete production procedure as shown in Figure 2, completes feeding, moulding, vibratory process in 1st district; By the first horizontal transmission device, product is transported to 2nd district together with moulding form, completes floating operation suitable for reading in 2nd district, then be transported to 3rd district; 3rd district, for ferry-boat district, are pushed to together with mould the platform member of making 4th district from 3rd district by the first pusher, complete quiet shut-down order in 4th district; In order the platform member of making is transported to 5th district, 6th district, 7th district successively together with mould by 4th district by the second horizontal transmission device, in 5th district, 6th district, 7th district complete respectively intensification, constant temperature, temperature-fall period in goods maintenance processes; After 7th district complete cooling process, be transported to 8th district; 8th district, for another ferry-boat district, are pushed to 9th district by the platform member after maintenance together with mould by the second pusher in 8th district; Complete form removal technique in 9th district; After 9th district complete form removal, platform member by crane gear handling to finished product stockyard, mould by the first horizontal transmission device be transported to 10th district, 11st district complete respectively mould, press setter skill clearly; Mould sends back to 1st district by the first horizontal transmission device, forms an end to end loop production streamline.
The concrete production stage of the platform member of track traffic safety station is as follows: the platform component molding mold of prefabricated corrosion resistant concrete rail traffic platform is cleared up (10th district carry out); Brushing release agent in described inner mold (10th district carry out); Make cage of reinforcement the inspection of the platform member of corrosion resistant concrete rail traffic platform; Pack the cage of reinforcement of described platform member in described mould (11st district carry out); Prepare corrosion resistant concrete and the corrosion resistant concrete preparing is poured in described mould and (is carried out in the 1st district); Adopt vibratory process to make corrosion resistant concrete moulding by casting (carrying out in the 1st district); Complete floating (carrying out in the 2nd district) suitable for reading; The corrosion resistant concrete of moulding by casting is put into maintenance station (carrying out in the 3rd district, 4th district) together with mould; The corrosion resistant concrete of moulding by casting is carried out to steam-cured processing (carrying out in the 5th district, 6th district, 7th district) together with mould; And the demoulding (carrying out in the 9th district) curing platform member is proceeded to stockyard natural curing.
In the present invention, building platform main body and platform member corrosion resistant concrete used adopts " alkali-activated slag fly ash concrete " to replace traditional ordinary concrete.In concrete, adopt the traditional high alkalinity portland cement of the alkali-activated slag coal ash instead of low alkali as cementitious material, effectively reduce concrete basicity and alkali.Experiment shows: alkali excites fly-ash slag concrete in acid, alkali, salt, to have good corrosion resistance, higher more than 2～3 times than the corrosion resistance of ordinary concrete.Therefore, adopting " alkali-activated slag fly ash concrete " to make corrosion-resistant pre-track traffic safety platform product has also possessed there being good corrosion resistance in acid, alkali, salt.The rail traffic platform of particularly, being built by above-mentioned corrosion resistant concrete is the platform that corrosion-resistant medium scope is pH value 2.0-13.0.Concrete strength grade >=C35, prefabricated units design bearing capacity >=4.0kPa.Therefore, compared with existing cast in situs formula concrete platform, its corrosion resistance is high more than 2～3 times, also can increase by 2～3 times the application life of corrosion-resistant pre-track traffic safety platform, extend the application life of pre-track traffic safety platform, be particularly useful for the regional platform construction of subway or the high-alkali corrosion of high salt, reduce later maintenance cost.
Before or after laying track, prefabricated multiple platform members are placed in position (platform member in the time settling its recess towards track), and multiple platform members are closely bonded together by modes such as interpolations in track platform job site, and make multiple platform component surface flush (engage and do not misplace), then, the platform main body production system of safety track traffic platform is set at the opposite side scene of the recess of the platform member placing, thereby can carry out by setting up at the scene the supporting constructions such as reinforcing bar build (also can adopt precast concrete block to carry out on-site consolidation) of platform main body.Because the recess of multiple platform members interconnects, thereby form escape space, therefore in casting process, construction safety and the low problem of work efficiency have greatly been alleviated at the scene, and carry out building of platform member and platform main body owing to adopting " alkali-activated slag fly ash concrete " to replace traditional ordinary concrete, not only solve the poor problem of platform concrete resistance, also greatly improve operating efficiency, reduced labour intensity, improved construction environment.
The present invention adopts batch production to produce, and job site assembling, can effectively shorten construction period, reduces constructor's labour intensity, job site civilization; The present invention with safety exit space, can effectively reduce or avoid the generation of human casualty accident, and can cancel subway and the conventional isolating door of light rail platform, reduce construction costs;
Finally it should be noted that, above embodiment is only in order to describe technical scheme of the present invention instead of this technical method is limited, the present invention can extend to other amendment, variation, application and embodiment in application, and therefore thinks that all such amendments, variation, application, embodiment are in spirit of the present invention and teachings.
Claims (10)
1. a method for cast in situs track traffic safety station, said method comprising the steps of:
Make platform member; With
Multiple platform members of making are set to cast in situs platform main body behind appropriate position, platform main body are flushed with described platform member,
Wherein making platform member comprises the following steps:
Brushing release agent in platform component molding mold;
Make cage of reinforcement the inspection of the platform member of corrosion resistant concrete rail traffic platform;
The cage of reinforcement of described platform member is packed in described platform element mold;
To prepare corrosion resistant concrete and the corrosion resistant concrete preparing is poured in described mould;
Adopt vibratory process to make corrosion resistant concrete moulding by casting;
Complete suitable for reading floating;
The corrosion resistant concrete of moulding by casting is put into maintenance station together with described mould;
The corrosion resistant concrete of moulding by casting is carried out to steam-cured processing together with described mould; With
The demoulding also proceeds to stockyard natural curing by curing platform member.
2. method according to claim 1, wherein said corrosion resistant concrete is alkali-activated slag fly ash concrete.
3. method according to claim 1, wherein said corrosion-resistant prefabricated assembled concrete rail traffic platform is the platform that corrosion-resistant medium scope is pH value 2.0-13.0.
4. method according to claim 1, wherein said stream curing temperature is controlled at 50-100 DEG C, and heating rate is controlled at 20-25 DEG C/h, and whole stream curing process time is controlled at 6-8h.
5. method according to claim 1, wherein said concrete is strength grade >=C35, prefabricated units design bearing capacity >=4.0kPa.
6. method according to claim 1, the corrosion resistant concrete of wherein building described platform main body is identical with the corrosion resistant concrete of making described platform member.
7. method according to claim 1, the step that wherein multiple platform members is arranged on to appropriate position comprises makes the recess of multiple platform members in the face of track setting.
8. right to use requires a system for the method manufacture track traffic safety station described in 1, and described system comprises:
Platform member production system, described platform member production system is for the production of platform member; With
Platform main body production system, described platform main body production system is adjacent at the on-the-spot installation position of described track traffic safety station with the platform member of having produced,
Wherein said platform member production system comprises: 1st district, 2nd district, 3rd district, 4th district, 5th district, 6th district, 7th district, 8th district, 9th district, 10 He11 district of districts, 1st district is connected with 2nd district by the first horizontal transmission device, 2nd district are connected with 3rd district by the first transmission device, 3rd district are connected with 4th district by the first pusher, 4th district are connected with 5th district by the second horizontal transmission device, 5th district are connected with 6th district by the second transmission device, 6th district are connected with 7th district by the second transmission device, 7th district are connected with 8th district by the second transmission device, 8th district are connected with 9th district by the second pusher, 9th district are connected by the first horizontal transmission device Yu10 district, 10 Yu11 district of districts are connected, He11 district is connected with 1st district, thereby make described platform member production system form loop production system.
9. production system according to claim 8, wherein, completes feeding, moulding, vibratory process in 1st district; By the first horizontal transmission device, the platform member of making is transported to 2nd district together with described platform component molding mold, completes floating operation suitable for reading in 2nd district, then be transported to 3rd district; Described 3rd district, for ferry-boat district, are pushed to together with mould the platform member of making 4th district from 3rd district by the first pusher, complete quiet shut-down order in 4th district; In order the platform member of making is transported to 5th district, 6th district, 7th district successively together with mould by 4th district by the second horizontal transmission device, in 5th district, 6th district, 7th district complete respectively intensification, constant temperature, temperature-fall period in goods maintenance processes; After 7th district complete cooling process, be transported to 8th district; Described 8th district, for another ferry-boat district, are pushed to 9th district by the platform member after maintenance together with mould by the second pusher in 8th district; Complete form removal technique in 9th district; After 9th district complete form removal, platform member by crane gear handling to finished product stockyard, mould by the first horizontal transmission device be transported to 10th district, 11st district complete respectively mould, press setter skill clearly; Mould sends back to 1st district by the first horizontal transmission device, thereby forms an end to end loop production streamline.
10. production system according to claim 8, the platform member of wherein making by described platform member production system is sent to described rail traffic platform place, the platform member of making has recess in a side, and the female portion settles towards track, and the sidepiece relative with the female portion of described platform member and described platform main body production system are adjacent, thereby carry out building of platform main body at track traffic safety platform scene.
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| CN201410145398.8A CN103924533B (en) | 2014-04-11 | 2014-04-11 | Track traffic safety station production system and production method |
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| CN201410145398.8A CN103924533B (en) | 2014-04-11 | 2014-04-11 | Track traffic safety station production system and production method |
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| CN103924533A true CN103924533A (en) | 2014-07-16 |
| CN103924533B CN103924533B (en) | 2016-06-29 |
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Citations (4)
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|---|---|---|---|---|
| EP1190826A2 (en) * | 2000-09-23 | 2002-03-27 | Präton International GmbH | Production process of a prefabricated wall element |
| CN101712544A (en) * | 2009-10-23 | 2010-05-26 | 广东省基础工程公司 | Cement-free slag powder concrete |
| CN103358387A (en) * | 2012-09-25 | 2013-10-23 | 苏州混凝土水泥制品研究院有限公司 | Production technology of anti-corrosion prefabricated reinforced concrete inspection well |
| CN204059211U (en) * | 2014-04-11 | 2014-12-31 | 苏州混凝土水泥制品研究院有限公司 | Track traffic safety station production system |
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2014
- 2014-04-11 CN CN201410145398.8A patent/CN103924533B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1190826A2 (en) * | 2000-09-23 | 2002-03-27 | Präton International GmbH | Production process of a prefabricated wall element |
| CN101712544A (en) * | 2009-10-23 | 2010-05-26 | 广东省基础工程公司 | Cement-free slag powder concrete |
| CN103358387A (en) * | 2012-09-25 | 2013-10-23 | 苏州混凝土水泥制品研究院有限公司 | Production technology of anti-corrosion prefabricated reinforced concrete inspection well |
| CN204059211U (en) * | 2014-04-11 | 2014-12-31 | 苏州混凝土水泥制品研究院有限公司 | Track traffic safety station production system |
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| CN103924533B (en) | 2016-06-29 |
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