CN101505042A - Construction method for pre-burying electrical line into cast-in-situ seamless hollow floor slab - Google Patents
Construction method for pre-burying electrical line into cast-in-situ seamless hollow floor slab Download PDFInfo
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- CN101505042A CN101505042A CNA2009100377045A CN200910037704A CN101505042A CN 101505042 A CN101505042 A CN 101505042A CN A2009100377045 A CNA2009100377045 A CN A2009100377045A CN 200910037704 A CN200910037704 A CN 200910037704A CN 101505042 A CN101505042 A CN 101505042A
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Abstract
The invention provides a construction method for embedding electromechanical pipelines in a cast-in-place beamless hollow slab. The method comprises the following steps : (1) sectionally positioning the embedded pipelines by a snapline, and marking the position of an embedded terminal box on a template; (2) fixing a lower-layer terminal box on a preset position, using a foam plate as a filling material in the terminal box, and tightly packaging the terminal box to prevent concrete entering the terminal box; and (3) connecting a lower-layer pipe and the box, sealing the openings of all the pipelines entering the terminal box by rubber stoppers to prevent concrete blocking the pipelines, fixing the lower-layer pipeline according to designed position and the like, wherein the positions and the shapes of the pipelines are adjusted when the pipelines are crossed in the step of embedding the pipelines so as to embed cross points of the pipelines in spaces among hollow pipes. The construction method for embedding the pipelines solves the problem that the electromechanical pipelines are embedded in overhigh positions, prevents the hollow pipes being perforated and ensures the construction quality.
Description
Technical field
The present invention relates to the construction method in the building trade electromechanical installation, belong to the dynamo-electric installation system steel pipe buried in advance of construction technical field, relate in particular to the complicated electromechanical pipeline Embedment Construction technology of small space in the Cast-in-situ Hollow Concrete Beamless Floor Slab.
Background technology
Modern architecture is along with the continuous development of science and technology, and the diversity for dwelling house and public building development requires traditional version and construction operation method to update to adapt to development of times.Cast-in-situ Hollow Concrete Beamless Floor Slab is the domestic structure new technology that grows up recent years, it has the deadweight of alleviating, reduce geological process, increase floor rigidity, the advantage that the soundproof effect of floor is good, significantly improve the structural of integral body, obtained application more and more widely in the dwelling house of many at home metropolitan large spaces, large span post net and the public building construction.
And along with cast-in-place concrete does not have applying of beam cassette ceiling, the technology of the Mechatronic Systems steel pipe buried in advance in the cassette ceiling also more and more draws attention.Because the structure of floor is special, the concrete layer of Mechatronic Systems preheating embedding line is subjected to structure influence, the small space that has only 50mm～75mm, and above-mentioned position major part is not carried out the smallpox finishing, cause the preheating embedding line can not be according to conventional construction method, and increasing more structural construction and the pre-buried cross-operation of electromechanical pipeline, the superelevation position was difficult to handle after pipeline intersected.
For this reason, need provide a kind of improved construction method, address the above problem.
Summary of the invention
The object of the present invention is to provide electromechanical pipeline pre-embedded construction method in a kind of Cast-in-situ Hollow Concrete Beamless Floor Slab, it has solved the problem of superelevation position, pipeline intersection back, can carry out steel pipe buried in advance in the Cast-in-situ Hollow Concrete Beamless Floor Slab small space, and construction quality is good.
For achieving the above object, the invention provides following technical scheme:
Electromechanical pipeline pre-embedded construction method in a kind of Cast-in-situ Hollow Concrete Beamless Floor Slab, be provided with hollow pipe in the described Cast-in-situ Hollow Concrete Beamless Floor Slab, this method comprises the steps: (1) according to designing requirement, and segmentation is carried out the snap the line location to preheating embedding line, marks the position of pre-buried terminal box; (2) in the terminal box of the fixed-site lower floor that marks, adopt cystosepiment to do filler in the described terminal box, and the terminal box parcel is tight, concrete enters in the terminal box in the construction after preventing; (3) pipeline of pre-buried lower floor, the pipeline and the terminal box that connect lower floor, all pipeline mouths of pipe that enter terminal box are all made of plug and are sealed processing, concrete blocking pipe in the construction after preventing, after pipeline, terminal box connection finished, it is online that pipeline is bundled in the floor bottom layer of the reinforcing steel; (4) pipeline on pre-buried upper strata; Wherein during preheating embedding line, pipeline intersects and the height at place, crosspoint surpasses when requiring, and adjusts the position and the shape of pipeline, and the crosspoint of pipeline and pipeline at least is embedded in the space between the hollow pipe.
Further, when pipeline did not intersect, pipeline all was embedded in the gap between the described hollow pipe.
Preferably, when pipeline moves towards identical with the hollow pipe installation, in the gap of steel pipe buried in advance between two parallel hollow pipes.
Preferably, when pipeline moved towards vertical with the hollow pipe installation, steel pipe buried in advance was in the gap at two hollow pipe delivery position places.
Preferably, two pipelines intersect, and the crosspoint is on hollow pipe the time, and wherein a pipeline partly bends, and the crosspoint of this pipeline and another root pipeline is in the gap of ceases to be busy pipe.
Preferably, two pipelines intersect, and wherein pipeline is moved on hollow pipe the time in the crosspoint, and the crosspoint of this pipeline and another root pipeline is in the gap of hollow pipe.
Preferably, when pipeline passes hollow pipe, to the tube wall breakage that causes on the hollow pipe, with material shutoff such as Polypropylence Sheet, woven cloth, sealing tape, gunnysacks.
Beneficial effect of the present invention is: electromechanical pipeline pre-embedded construction method provided by the present invention, in the space of the crosspoint of pipeline being adjusted between the hollow pipe, solved the problem of pipeline infall superelevation position, especially be adapted to pre-buried at the small space gut line of Cast-in-situ Hollow Concrete Beamless Floor Slab, avoided having to make pipeline because of the superelevation position problems in the prior art and passed the problem of hollow pipe, guarantee good construction quality, terminal box and can prevent that with the sealing of the pipeline mouth of pipe concrete from entering in it guarantees carrying out smoothly of follow-up construction.
Description of drawings
Fig. 1 is the construction flow chart of an embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention;
Fig. 2 is preheating embedding line position view among embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention;
Steel pipe buried in advance position view when Fig. 3 moves towards identical for preheating embedding line among the embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention with the hollow pipe installation;
Steel pipe buried in advance position view when Fig. 4 moves towards vertical for preheating embedding line among the embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention with the hollow pipe installation;
The pipeline schematic diagram that Fig. 5 intersects for two preheating embedding lines among the embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention;
Fig. 6 is the another kind of schematic diagram of handling of the pipeline that intersects for two preheating embedding lines among the embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention.
Embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Figure 1 shows that the process chart of an embodiment of electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab, Fig. 2--6 are respectively the pre-buried position of different situations underground pipelines and handle schematic diagram.
As shown in Figure 1, among this embodiment, the technological process of electromechanical pipeline Embedment Construction is as follows in the Cast-in-situ Hollow Concrete Beamless Floor Slab:
1, confides a technological secret: carry out drawing joint hearing work before going into operation, to civil engineering structure, do detailed audit, determine whether the position, size, specification, quantity, material etc. of preheating embedding line coincide mutually at the position of civil engineering Cast-in-situ Hollow Concrete Beamless Floor Slab structure and Mechatronic Systems steel pipe buried in advance.Before the construction operation personnel operation, the workmen is confided a technological secret the technical measures that make specific question in the construction of its detail knowledge and principal element and taked.This step is conventional engineering operating procedure.
2, snap the line location: do not have the pipe arrangement requirement of beam cassette ceiling hollow pipe at civil engineering, segmentation is carried out the snap the line location to preheating embedding line, on template, use the position that red paint marks pre-buried terminal box, the system of checking of measuring should be carried out in snap the line location, also can adopt other locate modes certainly in other embodiment of the present invention.Absolute altitude is installed is met civil engineering absolute altitude line, after the civil engineering absolute altitude determines, carry out installation again.
3, pipe, the prefabricated processing of box: (1) terminal box: pre-buried terminal box should be carried out processing and fabricating by designing requirement.Filler in the terminal box all adopts cystosepiment, can certainly adopt other fillers, and with the plastic closures adhesive tape that the terminal box parcel is tight, prevents that concrete from entering in the terminal box; (2) spool: according to the tube connector of the dimensioned straightway of design drawing, all mouths of pipe that enter terminal box must seal processing with plug, prevent the concrete blocking pipe.Certainly in other embodiment of the present invention, also terminal box be can directly buy, filler and sealing filled then in a manner described.
4, lower floor's box position is fixed: the electromechanical pipeline Embedment Construction will with civil engineering specialty close fit, pre-buried terminal box in the Cast-in-situ Hollow Concrete Beamless Floor Slab is close to template, each Mechatronic Systems light fixture, cigarette, heat detector according to the design drawing regulation, the position of broadcast stereo equipment is firm with iron nail, iron wire pinning with terminal box, good seal, light fixture particularly in a row, cigarette, the pre-buried location of heat detector terminal box, terminal box pre-buried good after, because the little space in the Cast-in-situ Hollow Concrete Beamless Floor Slab, it is very little that light fixture left-right and front-back adjustment leeway is installed, so require the location accurately necessary.
5, lower floor's pipe, box connect: lower floor's pipe, box are connected and fixed by designing requirement.What lower floor's pipe adopted in the present embodiment is coating steel pipe, and the junction of tube and tube connects with sleeve pipe, and adopts socket tightening formula steel pipe screw to be connected and fixed, and the counterpart that connects the mouth of pipe is in the center of sleeve pipe; Connect the steel pipe of terminal box, its mouth of pipe enters in the terminal box.Certainly lower floor's pipe also can adopt the PVC conduit, described PVC conduit adopts adhesive to connect or adopts modes such as bilateral or threeway to connect, conduit must clean the recanalization place before installation, interface sticks with glue agent and smears evenly, conduit should keep 3-5 motionless second after connecting, and makes it bonding firmly.During to the steel pipe simmering and bending, caliber is 25mm and when following, pulls the simmering and bending device with hand, and bending radius is not less than 10 times of external diameter of pipe, and crooked back free from flaw or significant recessed flat phenomenon; Carry out Pipe Cutting with hacksaw, pipe cutter or abrasive cutoff saw etc. when pipe cuts off, with the good size of pipe amount that needs cut off, be placed on the interior card of jaw and firmly cut, the cutting incision position should be concordant not crooked, and mouth of pipe filing is smooth smooth, no burr, iron filings Ex-all in the pipe.The simmering and bending of PVC conduit adopt supporting spring to operate, and pipe cuts off and adopts supporting casing knife to cut.
6, lower floor's spool is fixed: highly reach designing requirement for guaranteeing that dynamo-electric pre-embedded pipe is finished, and after pipe, box connection construction finish, that pipeline is online at bottom layer of the reinforcing steel with the iron wire colligation every about 0.5m.
7, lower floor's quality self-assessment: after the preheating embedding line installation, it is inspected for acceptance, emphasis checks whether Cast-in-situ Hollow Concrete Beamless Floor Slab Mechatronic Systems steel pipe buried in advance position, quantity, size, specification meet the requirement of design and cassette ceiling; After self check was qualified, the side carried out the next procedure construction.
8, upper strata steel pipe buried in advance:, determined on template, to carry out mark with red paint behind socket or other terminal box positions according to drawing snap the line location; The pipeline laying stretching line of should trying one's best, joint should be firmly tight, and the mouth of pipe must all be done shutoff and handle, and pipeline is firm with the iron wire colligation every about 0.5m.
9, upper strata quality self-assessment: after the preheating embedding line installation, tissue examination is checked and accepted, and emphasis checks whether Cast-in-situ Hollow Concrete Beamless Floor Slab Mechatronic Systems steel pipe buried in advance position, quantity, size, specification meet the requirement of design and cassette ceiling.After self check was qualified, the side carried out the next procedure construction.
10, handle hidden examination: guaranteeing that raw material have the quality certificate, the witness censorship is arranged, preheating embedding line material therefor specification and processing adhere to specification, and particular locations such as the absolute altitude of its installation, axis are accurate; Fixing means is reliable, can guarantee indeformablely in the concreting process not to be shifted, and meet the desired locus of cast-in-situ hollow floor plate.
11, finished product protection: check all mouths of pipe before (1) cast-in-situ hollow floor plate concrete work, must all do shutoff and handle; When (2) the cast-in-situ hollow floor plate electromechanical pipeline is pre-buried, note not trampling on hollow pipe and reinforcing bar; Strengthen before checking and accepting checking, stop to omit, send special messenger's nurse during casting concrete, damage pipe arrangement and terminal box displacement during with without vibration.When meeting conduit failure, should in time repair; (3) the terminal box position of various utensils must be accurate, stops tick slot and burrow etc. and to influence the phenomenon of entity quality; (4) carry out the work of telling somebody what one's real intentions are of uniting with other specialties, other specialties are in construction, and attention must not break electromechanical pipeline.
Introduce the analysis and the construction of Mechatronic Systems steel pipe buried in advance system in the cassette ceiling below in detail:
1, Mechatronic Systems steel pipe buried in advance system for content in the cassette ceiling:
Illuminator (being embedded in lower floor's reinforced concrete floor in advance)
Automatic alarm system (being embedded in lower floor's reinforced concrete floor in advance)
Electric distribution system (being embedded in lower floor's reinforced concrete floor in advance)
Socket distribution system (being embedded in the top bars concrete layer in advance)
Building weak electricity system (being embedded in the top bars concrete layer in advance)
2, cassette ceiling can pre-buried electromechanical pipeline position and the civil engineering specialty require:
Removing the hollow pipe position can not be pre-buried, and other concrete position all can be pre-buried, requires but must guarantee to reach following civil engineering specialty: a, guarantee the hollow pipe spacing; B, guarantee the levels concrete thickness; C, avoid causing the hollow pipe opening as far as possible, do not exceed requirement to guarantee its installing space because preheating embedding line dislocation and superelevation are laid the space and take hollow pipe; As this situation appears, must make encapsulation process to the hollow pipe opening.
3, the construction process of floor construction: civil engineering template installation → preheating embedding line trend and box are positioned on the template location mark → lower-layer concrete reinforcing bar binding → lower-layer concrete electromechanical pipeline pre-buried → hollow pipe installation → last layer concrete electromechanical pipeline is pre-buried → upper strata concrete reinforcement colligation → concrete casting
4, whether the concrete layer of cored slab satisfies the analysis of the pre-buried spatial altitude of Mechatronic Systems:
Minimum Concrete Protective Coating Thickness 10mm+ two-way concrete slab diameter sum 25mm+ single electric spool diameter 20-25mm+ line box top and spool apex distance are from 15mm, and then required total pre-buried spatial altitude is 70mm-75mm, greater than cassette ceiling reinforced concrete soil thickness 50mm.So cassette ceiling levels reinforced concrete floor all can not satisfy illumination, warning automatically, power, socket and building weak electricity system by scheming pre-buried space.
5, the construction of embedded system
According to the thickness of reinforced concrete floor, rationally arrange and adjust the trend and the caliber of Mechatronic Systems preheating embedding line.According to the layout of illuminator, dynamical system, jack system and automatic alarm system, the switch that reaches the building weak electricity system, socket, equipment, unify the position of moving towards of downlead pipe.Break through traditional pre-buried principle of electromechanical pipeline, utilize the spacing all around of hollow pipe and hollow pipe and structural edge or beam latasuture crack to carry out pipe arrangement.
Generally speaking, install as pipeline and hollow pipe and to move towards identical, then preheating embedding line can be embedded in the space between the two parallel hollow pipes (as shown in Figure 3, wherein 01 be depicted as hollow pipe, 03 is depicted as preheating embedding line) in advance; Vertical as pipeline and hollow pipe installation trend, then preheating embedding line can be embedded in the space at two hollow pipe delivery position places in advance, and should accomplish horizontal flat vertically (as shown in Figure 4, wherein 01 be depicted as hollow pipe, 04 is depicted as preheating embedding line); The cross section of these two kinds of pre-buried schemes wherein 01 is depicted as hollow pipe with reference to figure 2, and 02 is depicted as bar-mat reinforcement, and 03 is depicted as the preheating embedding line parallel with hollow pipe, and 04 is depicted as the preheating embedding line vertical with hollow pipe.
Intersect when running into pipeline, and the height at place, crosspoint needs pipeline is adjusted when surpassing the designing requirement height, crosspoint at least is embedded in the gap between hollow pipe.Move towards identical as pipeline with the hollow pipe installation, then the crosspoint of the pipeline of identical trend can be embedded between the spacing of two hollow pipes in advance, and the trend of pipeline is adjusted accordingly (as shown in Figure 5, wherein 01 be depicted as hollow pipe, 05 is depicted as first preheating embedding line, 06 is depicted as second pipeline revises the front position, and 07 is depicted as second pipeline revises the position, back).Vertical as pipeline and hollow pipe installation trend, then the crosspoint of the pipeline of capwise can be embedded between the spacing of two hollow pipe delivery positions in advance, and the trend of pipeline is adjusted accordingly (as shown in Figure 6, wherein 01 be depicted as hollow pipe, 05 is depicted as first preheating embedding line, 06 is depicted as second pipeline revises the front position, and 07 is depicted as second pipeline revises the position, back).Certainly can also be with other adjustment scheme, the crosspoint is embedded in the gap between the hollow pipe gets final product.
When pipeline and hollow pipe can't be avoided, when pipeline must pass hollow pipe, the hollow pipe tube wall breakage that then causes to passing through hollow pipe, shutoff in time, the shutoff of hollow pipe can be used Polypropylence Sheet, woven cloth and sealing tape etc., can fill in materials such as gunnysack, Polypropylence Sheet earlier when hole is big in hole, cement mortar can not enter in the pipe and be as the criterion when mixing earth to build.
Electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab of the present invention, problem to superelevation position, pipeline intersection back is handled, make the height of steel pipe buried in advance reach designing requirement, and finally reach dynamo-electric when rationally the laying of pipeline is installed, guaranteed the dynamo-electric construction quality that pipeline is installed of Cast-in-situ Hollow Concrete Beamless Floor Slab.
Above disclosed only is embodiments of the invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of being done according to the present patent application claim still belongs to the protection range that the present invention is contained.
Claims (7)
1, electromechanical pipeline pre-embedded construction method in a kind of Cast-in-situ Hollow Concrete Beamless Floor Slab is provided with hollow pipe in the described Cast-in-situ Hollow Concrete Beamless Floor Slab, and this method comprises the steps:
(1) according to designing requirement, segmentation is carried out the snap the line location to preheating embedding line, marks the position of pre-buried terminal box;
(2) in the terminal box of the fixed-site lower floor that marks, adopt cystosepiment to do filler in the described terminal box, and the terminal box parcel is tight, concrete enters in the terminal box in the construction after preventing;
(3) pipeline of pre-buried lower floor, the pipeline and the terminal box that connect lower floor, all pipeline mouths of pipe that enter terminal box are all made of plug and are sealed processing, concrete blocking pipe in the construction after preventing, after pipeline, terminal box connection finished, it is online that pipeline is bundled in the floor bottom layer of the reinforcing steel;
(4) pipeline on pre-buried upper strata;
Wherein during preheating embedding line, pipeline intersects and the height at place, crosspoint surpasses when requiring, and adjusts the position and the shape of pipeline, and the crosspoint of pipeline and pipeline at least is embedded in the space between the described hollow pipe.
2, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 1 is characterized in that: Uncrossed pipeline all is embedded in the gap between the described hollow pipe.
3, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 2
It is characterized in that: when pipeline moves towards identical with described hollow pipe installation, in the gap of steel pipe buried in advance between two parallel described hollow pipes.
4, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 2 is characterized in that: when pipeline moved towards vertical with described hollow pipe installation, steel pipe buried in advance was in the gap at two described hollow pipe delivery position places.
5, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 1, it is characterized in that: two pipelines intersect, the crosspoint is on described hollow pipe the time, wherein a pipeline partly bends, and the crosspoint of this pipeline and another root pipeline is in the gap of described ceases to be busy pipe.
6, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 1, it is characterized in that: two pipelines intersect, wherein pipeline is moved on described hollow pipe the time in the crosspoint, and the crosspoint of this pipeline and another root pipeline is in the gap of described hollow pipe.
7, electromechanical pipeline pre-embedded construction method in the Cast-in-situ Hollow Concrete Beamless Floor Slab as claimed in claim 1, it is characterized in that: when pipeline passes described hollow pipe, to the tube wall breakage that causes on the described hollow pipe, with material shutoff such as Polypropylence Sheet, woven cloth, sealing tape, gunnysacks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100377045A CN101505042B (en) | 2009-03-09 | 2009-03-09 | Construction method for pre-burying electrical line into cast-in-situ seamless hollow floor slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100377045A CN101505042B (en) | 2009-03-09 | 2009-03-09 | Construction method for pre-burying electrical line into cast-in-situ seamless hollow floor slab |
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| CN101505042A true CN101505042A (en) | 2009-08-12 |
| CN101505042B CN101505042B (en) | 2011-03-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532552A (en) * | 2016-12-28 | 2017-03-22 | 淮北矿业(集团)工程建设有限责任公司 | Conduit embedding construction technology |
| CN110289570A (en) * | 2019-06-27 | 2019-09-27 | 中国二十二冶集团有限公司 | Electrical and light current avoids the pre-buried method that misplaces |
| CN111711116A (en) * | 2020-06-11 | 2020-09-25 | 德恩环保建材盐城有限公司 | Pre-embedding process for electric pipeline box of concrete light partition wall board strip |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2624487Y (en) * | 2003-06-04 | 2004-07-07 | 上海中月电缆技术有限公司 | Installing electric wire for prefabricated pipe type building |
| ATE393492T1 (en) * | 2005-01-21 | 2008-05-15 | Zurecon Ag | DEVICE FOR MEDIA AND ENERGY SUPPLY AND INSTALLATION METHOD |
| CN101225909B (en) * | 2008-01-23 | 2010-08-04 | 莱西市建筑总公司 | Locating preburied sleeve for electrical installation project |
| CN100592593C (en) * | 2008-03-27 | 2010-02-24 | 成都建筑工程集团总公司 | Construction method for installing wire pipe and wire box on the wall |
-
2009
- 2009-03-09 CN CN2009100377045A patent/CN101505042B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532552A (en) * | 2016-12-28 | 2017-03-22 | 淮北矿业(集团)工程建设有限责任公司 | Conduit embedding construction technology |
| CN110289570A (en) * | 2019-06-27 | 2019-09-27 | 中国二十二冶集团有限公司 | Electrical and light current avoids the pre-buried method that misplaces |
| CN111711116A (en) * | 2020-06-11 | 2020-09-25 | 德恩环保建材盐城有限公司 | Pre-embedding process for electric pipeline box of concrete light partition wall board strip |
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