CN106320732A - Method for reperforating preformed hole of airbag core model hole-forming technology - Google Patents
Method for reperforating preformed hole of airbag core model hole-forming technology Download PDFInfo
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- CN106320732A CN106320732A CN201610727378.0A CN201610727378A CN106320732A CN 106320732 A CN106320732 A CN 106320732A CN 201610727378 A CN201610727378 A CN 201610727378A CN 106320732 A CN106320732 A CN 106320732A
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- China
- Prior art keywords
- preformed hole
- hole
- concrete
- reperforating
- air bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0207—Arrangements for filling cracks or cavities in building constructions in hollow structures, e.g. cavity walls
Abstract
The invention provides a method for reperforating a preformed hole of an airbag core model hole-forming technology and belongs to the field of building construction methods. The method comprises the steps: 1, mounting a preformed hole sealing device, wherein the sealing device is used for enabling the preformed hole to form a closed hole cavity; 2, pouring concrete; 3, inspecting whether water seepage exists in the preformed hole or not, continuously conducting a next step if water seepage does not exist in the preformed hole, and reworking and repeating the step 1 to the step 2 if water seepage exists in the preformed hole; 4, coating waterproof paint; and 5, pouring the concrete again. The reperforating method is simple, high in operability and has high reperforating quality.
Description
Technical field
The present invention relates to construction techniques field, in particular to a kind of air bag core hole creating technology preformed hole
Reperforating method.
Background technology
Along with domestic economy level and growth in the living standard, modern architecture is also tended to large bay by people, high headroom,
Comfort level, sound insulation, energy-conserving and environment-protective, the requirements at the higher level of the aspects such as economical rationality.The beam slab knot constructing obtained traditionally
Structure has that primary-secondary beam is many, appearance is poor, building arrangements is dull, sound insulation is poor, from feature great, that space availability ratio is the highest, no
The demand of people can be met.
Summary of the invention
In view of this, the invention aims to overcome deficiency of the prior art, it is provided that a kind of perforations adding quality is high
The reperforating method of air bag core hole creating technology preformed hole.
For solving the problems referred to above, the solution that the present invention provides is as follows:
The reperforating method of a kind of air bag core hole creating technology preformed hole, is applied to pouring of hollow building cover, including step;
One, installing preformed hole sealing device, described sealing device is for forming a blind bore chamber by preformed hole;
Two, casting concrete;
Three, checking whether described preformed hole seeps water, the qualified next step that proceeds, defective repetition step one of doing over again arrives
Step 2;
Four, brushing water-repellent paint;
Five, casting concrete again.
Further, before step one, further comprise the steps of: removing hollow building cover cavity internal water accumulation, described preformed hole is entered
Row dabbing is also cleared up.
Further, the described sealing device in step 3 is the plastic cylinder that the diameter compatible with described preformed hole closes,
When described plastic cylinder is installed in described preformed hole, the bottom of the cavity of the end opening of described plastic cylinder and described hollow building cover
Contact, the distance suitable for reading apart from described preformed hole suitable for reading of described plastic cylinder is not less than 10mm.
Further, further comprise the steps of: between step 3 and step 4 whether the described preformed hole of inspection is cleaned out and incited somebody to action
Described preformed hole periphery repeats abundant moistening.
Further, high one of the label of the concrete by being used than described hollow building cover of the concrete used by perforations adding etc.
The pea gravel concreten of level, mixed with extender in perforations adding concrete.
Further, the volume of described extender is the 10-12% of concrete slurry, and expansion rate is 0.03%.
Further, step 4 includes: be stirred the concrete poured, and keeps concrete surface than described preformed hole
Suitable for reading low at least 30mm.
Further, the water-repellent paint brushed in step 5 is Lao Yaer, and the film forming thickness of described water-repellent paint is the least
In 1.5mm.
Further, further comprise the steps of: between step 6 and step 7 and check again for whether described preformed hole is cleaned out
And described preformed hole periphery is repeated abundant moistening.
Further, step 7 includes: be stirred the concrete poured, and keeps concrete surface and described preformed hole
Equal, or exceed 5-10mm than the suitable for reading of described preformed hole.
Compared with prior art, its remarkable advantage is the present invention:
The reperforating method of the air bag core hole creating technology preformed hole of the present invention passes through sealing device by preformed hole and hollow building
The cavity isolation of lid, uses the method poured at twice by concrete, and has added infiltration monitoring step between two-step pouring,
Seamless to guarantee the inside concrete consolidation poured, decrease because of caused workload of doing over again off quality simultaneously.It is coated with
Cover water-repellent paint and further enhance fitting together perfectly of the concrete that newly pours and preformed hole inwall.The air bag core of the present invention
The reperforating method of hole creating technology preformed hole is simple, strong operability, is that the air bag core hole creating technology that a kind of perforations adding quality is high is reserved
The reperforating method in hole.
For making the above-mentioned purpose of the present invention, feature and advantage can become apparent from understandable, preferred embodiment cited below particularly, and join
Close appended accompanying drawing, be described below in detail.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 shows the stream of the reperforating method of a kind of air bag core hole creating technology preformed hole that the embodiment of the present invention provided
Cheng Tu;
Fig. 2 shows the structural representation that the plastic cylinder that the embodiment of the present invention is provided coordinates with preformed hole;
Fig. 3 shows the structural representation of the preformed hole casting concrete that the embodiment of the present invention provided.
Main element symbol description:
100-hollow building cover;110-preformed hole;120-cavity;130-plastic cylinder;200-concrete.
Detailed description of the invention
For the ease of understanding the present invention, below with reference to the relevant drawings perforations adding side to air bag core hole creating technology preformed hole
Method is described more fully.Accompanying drawing gives the preferred embodiment of the reperforating method of air bag core hole creating technology preformed hole.
But, the reperforating method of air bag core hole creating technology preformed hole can be realized by many different forms, however it is not limited to this
Embodiment described by literary composition.On the contrary, providing the purpose of these embodiments is to make the benefit to air bag core hole creating technology preformed hole
The disclosure of hole method is more thorough comprehensively.
It should be noted that when element is referred to as " being fixed on " another element, and it can be directly on another element
Or element placed in the middle can also be there is.When an element is considered as " connection " another element, and it can be to be directly connected to
To another element or may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " time,
There is not intermediary element.Term as used herein " vertical ", " level ", "left", "right" and similar statement are simply
For illustrative purposes.
Unless otherwise defined, all of technology used herein and scientific terminology and the technical field belonging to the present invention
The implication that technical staff is generally understood that is identical.Herein in the description of the reperforating method of air bag core hole creating technology preformed hole
The term used is intended merely to describe the purpose of specific embodiment, it is not intended that limit the present invention.Art used herein
Language " and/or " include the arbitrary and all of combination of one or more relevant Listed Items.
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is elaborated.
Embodiment
See also Fig. 1, Fig. 2 and Fig. 3, in the hollow building cover 100 using air bag core pore-forming, hollow building cover 100
On leave technique preformed hole 110.For ensureing the integrity of hollow building cover 100 and excellent serviceability, should be at air bag core
After pore-forming, preformed hole 110 is carried out perforations adding.
Present embodiments provide the reperforating method of a kind of air bag core hole creating technology preformed hole, be applied to hollow building cover 100
Pour, the reperforating method of this air bag core hole creating technology preformed hole includes step;
One, preformed hole 110 sealing device is installed;Sealing device for forming a blind bore chamber by preformed hole 110;
Two, casting concrete 200;
Three, check whether preformed hole 110 seeps water;The qualified next step that proceeds, defective repetition step one of doing over again arrives
Step 2;
Four, brushing water-repellent paint;
Five, casting concrete 200 again.
If being intended to block preformed hole 110, need to make preformed hole 110 and the cavity 120 of hollow building cover 100 formed two independent
Cavity, i.e. still retains the cavity 120 of hollow building cover 100 when blocking preformed hole 110.Thus added close in preformed hole 110
Seal apparatus, keeps apart the cavity 120 of preformed hole 110 with hollow building cover 100.
This construction method is applicable to: teaching building, underground garage, market (hypermarket, little retail shop), House with Big Room Openning, work
Industry Factory Building (logistics, R & D Building), hotel, general public building (bank, large conference room, small-sized arenas, office building) etc. are built.Logical
Crossing hollow building cover 100 end face that this construction method pours substantially in " work " font, floor is flexural member, by compressive region
Concrete bearing compressive force, the reinforcing bar of tensile region bears pulling force;Stress near neutral axis is the least.Use for saving concrete
Amount, alleviates superstructure deadweight, is pumped by the concrete near neutral axis, stays the upper and lower two panels of connection to be allowed to common stress and shearing resistance institute
The concrete rib needed, forms hollow building cover 100.
Concrete, before step one, further comprise the steps of: removing hollow building cover 100 cavity 120 internal water accumulation, to preformed hole
110 carry out dabbing and clear up.
Before casting concrete 200, preformed hole 110 is cleared up and dabbing process contribute to casting concrete 200 with
Preformed hole 110 is repaired face and is preferably combined.From the structure of hollow building cover 100, preformed hole 110 is the sky of hollow building cover 100
A hole on chamber 120, preformed hole 110 connects with cavity 120.
Specifically, as it is shown in figure 1, in the present embodiment,
In step S101, removing hollow building cover 100 cavity 120 internal water accumulation:
(1) use vacuum pump to be blotted by the water in the cavity 120 of hollow building cover 100, vacuum pump is connected to water pipe, by water pipe
It is extend in the cavity 120 of hollow building cover 100 by preformed hole 110, water pipe position in cavity 120 several times should be converted as far as possible
Put, to ensure the hydrops sucking-off in cavity 120 fully.
(2) after draining, carry out an acceptance inspection inspection, can turn sequence construction after confirming to drain only.
In step s 102, when preformed hole 110 being carried out dabbing and clears up:
(1) use hammer and the manual repairing face to preformed hole 110 of chisel, i.e. the face of cylinder carries out dabbing, and dabbing is
Concrete 200 structural plane is dug out a rule indenture, and effect is that the construction surface making two construction stages is firmly bonded.Its principle
For: increase the roughness on the face of cylinder of preformed hole 110, increase construction area so that intermolecular engaging force increases, favorably
Concrete 200 bonding in two construction stages.So that guarantee will not be as smooth preformed hole 110 is when casting concrete 200
There is trickle crackle in interface.The degree of depth of dabbing is 5~10 millimeters, and the spacing of dabbing trace is 30 millimeter, and dabbing rate is not
Less than 90%.
The instrument of dabbing, in addition to can using hammer and chisel, can also use in high-volume and large-area dabbing
Dabbing machine, has reached the effect of dabbing efficient, laborsaving, uniform.
(2) after dabbing, concrete 200 dregs, the spot of hole wall to preformed hole 110 and preformed hole 110 periphery is carried out clearly
Reason, it is to avoid concrete 200 pours slag inclusion, improves mending concrete 200 and the adhesive effect on limit, preformed hole 110 hole further.For
Make concrete 200 pours effect more preferably, and the also floating ash of reply preformed hole 110 and preformed hole 110 periphery is purged.
(3), after the dabbing of preformed hole 110 and cleaning, carry out an acceptance inspection inspections, confirms that dabbing is qualified, can after cleaning is thorough
Turn sequence construction.
In step s 103, preformed hole 110 sealing device is installed:
(1) as in figure 2 it is shown, sealing device is the plastic cylinder 130 that the diameter compatible with preformed hole 110 closes, plastic cylinder
130 when being installed in preformed hole 110, and the end opening of plastic cylinder 130 contacts with the bottom of the cavity 120 of hollow building cover 100, plastics
The distance that the distance preformed hole 110 suitable for reading of cylinder 130 is suitable for reading is not less than 10mm.Plastic cylinder 130 is the cylinder of both ends open, moulds
The external diameter of material cylinder 130 closes with the diameter compatible of preformed hole 110, it is ensured that plastic cylinder 130 can be inserted in preformed hole 110,
Preformed hole 110 does not rocks.The distance preformed hole 110 suitable for reading of plastics circular hole is suitable for reading a distance not less than 10mm,
Need again to be stuck in the top layer of hollow building cover 100, to ensure that concrete 200 is the most excessive when casting concrete 200, i.e. connects simultaneously
Filled by concrete 200 for one section of nearly preformed hole 110 so that the plate top of the hollow building cover 100 poured is more smooth.
(2) further comprise the steps of: between step 3 and step 4 whether inspection preformed hole 110 is cleaned out, and by preformed hole
110 peripheries repeat abundant moistening.
After inserting plastic cylinder 130 in preformed hole 110, the wall friction of plastic cylinder 130 and preformed hole 110 can again
Produce some impurity such as concrete 200 dregs and mortar dust.For ensure concrete 200 well pour effect, should be the most clear
Reason preformed hole 110.Use brush or watering can by abundant to preformed hole 110 and periphery thereof moistening, prepare for casting concrete 200.
In step S104, casting concrete 200:
(1) the high grade of the concrete 200 that relatively hollow building cover 100 is used of the concrete 200 used by perforations adding.It is specially
C40, C40 are concrete 200 strength grades, and the compressive strength standard value of its correspondence is 26.8N/m^2, tensile strength standard value
2.39N/m^2.Refer to " concrete 200 code for structural design " GB50010-2010.
(2) concrete 200 used by perforations adding is the pea gravel concreten 200 mixed with extender.Concrete 200 is in the mistake condensed
Cheng Zhonghui shrinks, if integrated poured beam slab (base plate) usually need not add extender.But in rear repairing
During hole, owing to the shrinkage degree of New-old concrete 200 is different, easily generation crack at construction joint, it is therefore desirable to add swollen
Swollen dose.This extender is ZY extender.The advantage of ZY extender is: volume is low, and expansion rate is high, and alkali content is low, and the slump is damaged
Losing little, intensity is high.
(3) volume of extender is the 10-12% of concrete 200 slurry, and expansion rate is 0.03% so that newly pour is mixed
Solidifying soil 200 can fully expand, it is ensured that does not produce crack at construction interface.
(4) this step casting concrete 200 specifically includes: is stirred the concrete 200 poured, and keeps concrete
200 suitable for reading low at least 30mm than described preformed hole 110.
As it is shown on figure 3, the concrete 200 of filling-up hole pours at twice, it is poured into from preformed hole during first casting concrete 200
The distance suitable for reading of 110 is at least at 30mm, it is ensured that can close water when doing full water curing, i.e. leave the cavity accommodating water.Pass through
Stirring to concrete 200 ensures the closely knit seamless of concrete 200.
In step S105, check whether preformed hole 110 seeps water:
(1) full water curing: appointment special messenger's maintenance, topped up with water in the preformed hole 110 poured ground floor concrete 200,
Whether the moisture observing each hole of tour the most afterwards evaporates withered or there is leakage scenarios.Each hole Dou Shui must be kept
Divide abundance, if finding leakage scenarios, cutting concrete 200 immediately and again constructing, and underproof hole is made a record.
(2) each hole is checked one by one, submit a report asking for each side after self-inspection is qualified again and carry out joint inspection (according to Party A's feelings
Condition is it needs to be determined that now the need of carrying out joint inspection), next procedure that passed examination is allowed for access, underproof do over again
Reform, till qualified.And underproof hole is made a record.
In step s 106, brushing water-repellent paint:
(1) do not seep water in order to ensure the preformed hole 110 having poured ground floor concrete 200, preformed hole 110 is added one again
Layer water-repellent paint.Before coating water-repellent paint, reply preformed hole 110 is cleared up, and must not have concrete 200 dregs, mortar
Deng impurity, the wall of the moistening preformed hole 110 of then watering.By on the brushing closely knit for the water-repellent paint wall with preformed hole 110.
(2) water-repellent paint coated by is Lao Yaer, and the film forming thickness of described water-repellent paint is not less than 1.5mm.Lao Yaer
It is to be planted, by more than 20, the water-based emulsion that raw material synthesizes through special process, it is adaptable to the permanent waterproof layer construction of building.
1.5mm is one and ensures the most water-tight, permeable one-tenth-value thickness 1/10, can coat the labor of different-thickness as the case may be when coating
Ya Er coating.
(3) further comprise the steps of: between step 6 and step 7 and check again for preformed hole 110 and whether clean out and will be reserved
Hole 110 periphery repeats abundant moistening.It is appreciated that this step was both needed to implement before each casting concrete 200, mixed to ensure
That coagulates soil 200 well pours effect, prepares for casting concrete 200.
In step s 107, casting concrete 200 again:
(1) this step is second time casting concrete 200, and the relatively hollow building cover 100 of the concrete 200 used by perforations adding is used
Concrete 200 high grade, specially a C40.
(2) concrete 200 used by perforations adding is the pea gravel concreten 200 mixed with extender.Concrete 200 is in the mistake condensed
Cheng Zhonghui shrinks, if integrated poured beam slab (base plate) usually need not add extender.But in rear repairing
During hole, owing to the shrinkage degree of New-old concrete 200 is different, easily generation crack at construction joint, it is therefore desirable to add swollen
Swollen dose.This extender is ZY extender.The advantage of ZY extender is: volume is low, and expansion rate is high, and alkali content is low, and the slump is damaged
Losing little, intensity is high.
(3) volume of extender is the 10-12% of concrete 200 slurry, and expansion rate is 0.03% so that newly pour is mixed
Solidifying soil 200 can fully expand, it is ensured that does not produce crack at construction interface.
(4) this step casting concrete 200 specifically includes: is stirred the concrete 200 poured, and keeps concrete
200 equal with preformed hole 110.By the stirring of concrete 200 is ensured the closely knit seamless of concrete 200.For basement
Top boards etc. need to banket or also have the surface layers such as other concrete 200, mortars on top, can be by 200 relatively preformed holes of concrete
High 5-10mm are received at 110 places suitable for reading, allow at hole can not hydrops, reduce the probability of infiltration.
In step S108, maintenance:
It is specially step 8: use plastic sheeting or gunnysack that the hole of described preformed hole 110 is covered.According to thermal technology
Calculating, concrete 200 is internal is not more than 25 DEG C with surface temperature difference, and concrete 200 has poured and covered one layer of plastics after wiping one's face in time
Thin film is incubated, and timely water storing conservation prevents concrete 200 internal-external temperature difference excessive and causes thermal cracking.According to actual at that time
Situation, if insulation material should be strengthened when the temperature difference is more than 25 DEG C, as covered gunnysack etc., excessive to prevent concrete 200 from producing
Thermal (temperature difference) stress and crack.
In step S109, check and accept:
This engineering is carried out an acceptance inspection after completing by maintenance, underproof for checking and accepting, and re-starts construction.
The reperforating method of the air bag core hole creating technology preformed hole of the present invention passes through sealing device by preformed hole and hollow building
The cavity isolation of lid, uses the method poured at twice by concrete, and has added infiltration monitoring step between two-step pouring,
Seamless to guarantee the inside concrete consolidation poured, decrease because of caused workload of doing over again off quality simultaneously.It is coated with
Cover water-repellent paint and further enhance fitting together perfectly of the concrete that newly pours and preformed hole inwall.The air bag core of the present invention
The reperforating method of hole creating technology preformed hole is simple, strong operability, is that the air bag core hole creating technology that a kind of perforations adding quality is high is reserved
The reperforating method in hole.
In all examples being illustrated and described herein, any occurrence should be construed as merely exemplary, and not
Being as restriction, therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter represent similar terms, therefore, the most a certain Xiang Yi in following accompanying drawing
Individual accompanying drawing is defined, then need not it be defined further and explains in accompanying drawing subsequently.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but also
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that, for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a reperforating method for air bag core hole creating technology preformed hole, is applied to pouring of hollow building cover, it is characterised in that bag
Include step;
One, installing preformed hole sealing device, described sealing device is for forming a blind bore chamber by preformed hole;
Two, casting concrete;
Three, checking whether described preformed hole seeps water, the qualified next step that proceeds, defective repetition step one of doing over again is to step
Two;
Four, brushing water-repellent paint;
Five, casting concrete again.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that in step one
Further comprise the steps of: removing hollow building cover cavity internal water accumulation before, described preformed hole is carried out dabbing and clears up.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that in step 3
Described sealing device be the plastic cylinder that diameter compatible with described preformed hole closes, described plastic cylinder is installed on described reserved
Time in hole, the end opening of described plastic cylinder contacts with the bottom of the cavity of described hollow building cover, described plastic cylinder suitable for reading away from
The distance suitable for reading from described preformed hole is not less than 10mm.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that step 3 with
Further comprise the steps of: between step 4 whether the described preformed hole of inspection is cleaned out and described preformed hole periphery repeats fully profit
Wet.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that used by perforations adding
The pea gravel concreten of the high grade of label of the concrete concrete by being used than described hollow building cover, perforations adding coagulation
Mixed with extender in soil.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 5, it is characterised in that described expansion
The volume of agent is the 10-12% of concrete slurry, and expansion rate is 0.03%.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that step 4 bag
Include: the concrete poured is stirred, and keep the concrete surface suitable for reading low at least 30mm than described preformed hole.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that in step 5
The water-repellent paint brushed is Lao Yaer, and the film forming thickness of described water-repellent paint is not less than 1.5mm.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that step 6 with
Further comprise the steps of: between step 7 and check again for whether described preformed hole is cleaned out and repeated fully by described preformed hole periphery
Moistening.
The reperforating method of air bag core hole creating technology preformed hole the most according to claim 1, it is characterised in that step 7
Including: the concrete poured is stirred, and keeps concrete surface equal with described preformed hole, or upper than described preformed hole
Mouth exceeds 5-10mm.
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Cited By (1)
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CN113550331A (en) * | 2021-07-06 | 2021-10-26 | 上海市基础工程集团有限公司 | Milling joint based on cross steel plate and limiting air bag core mold and construction method |
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CN202730973U (en) * | 2012-09-05 | 2013-02-13 | 中建七局第二建筑有限公司 | Concrete outer wall bolt hole leakproof structure |
CN104196161A (en) * | 2014-09-17 | 2014-12-10 | 谭泽文 | Construction method for cast-in-situ hollow floorslab and airbag-type core framework thereof |
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CN1958992A (en) * | 2005-07-21 | 2007-05-09 | 邱则有 | Lightweight permanent embryonic shell in use for filling concrete |
KR101186104B1 (en) * | 2012-07-03 | 2012-09-27 | 케이엘산업 주식회사 | Method for repairing expansion joint part between concrete structures using inducing conduct pipe |
CN202730973U (en) * | 2012-09-05 | 2013-02-13 | 中建七局第二建筑有限公司 | Concrete outer wall bolt hole leakproof structure |
CN104196161A (en) * | 2014-09-17 | 2014-12-10 | 谭泽文 | Construction method for cast-in-situ hollow floorslab and airbag-type core framework thereof |
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CN113550331A (en) * | 2021-07-06 | 2021-10-26 | 上海市基础工程集团有限公司 | Milling joint based on cross steel plate and limiting air bag core mold and construction method |
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