CN106930457A - A kind of new prefabricated assembled concrete hollow floor and preparation method thereof - Google Patents
A kind of new prefabricated assembled concrete hollow floor and preparation method thereof Download PDFInfo
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- CN106930457A CN106930457A CN201710306735.0A CN201710306735A CN106930457A CN 106930457 A CN106930457 A CN 106930457A CN 201710306735 A CN201710306735 A CN 201710306735A CN 106930457 A CN106930457 A CN 106930457A
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- Prior art keywords
- side plate
- groove
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- plate
- hollow floor
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
- E04B5/043—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement having elongated hollow cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2103/00—Material constitution of slabs, sheets or the like
- E04B2103/02—Material constitution of slabs, sheets or the like of ceramics, concrete or other stone-like material
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of new prefabricated assembled concrete hollow floor, including left side plate, intermediate plate and the right side plate being sequentially connected, grout hole is all provided with left side plate, intermediate plate and right side plate；Left side plate side is provided with upper left tongue and groove, and intermediate plate side descends tongue and groove, opposite side to go up tongue and groove in being provided with being provided with, right side plate side is provided with bottom right tongue and groove；In lower tongue and groove coordinate with upper left tongue and groove, in upper tongue and groove coordinate with bottom right tongue and groove, upper left tongue and groove and in be both provided with grout hole at upper tongue and groove.The present invention sets tongue and groove by concrete porous floor two ends, realize being sequentially connected between floor by the cooperation up and down between tongue and groove, meet the demand of floor globality, improve the adaptability of floor, realize building standardization, avoid existing hollow floor sheet separation larger, the phenomenon such as floor cracking, leak caused by settling or deforming inequality；For existing building provides a kind of more preferably Assembled Building plate shape formula mode, with good Social benefit and economic benefit.
Description
Technical field
The present invention relates to building industrialization field, and in particular to a kind of new prefabricated assembled concrete hollow floor and its
Preparation method.
Background technology
Advocated under the background of modern architecture industrialization energetically in country in recent years, China's assembled architecture starts large area and goes out
Existing, architectural design standard, building subassembly seriation, component production plant is developed rapidly.
Former precast concrete hollow floor is generally monoblock type and profile type for trapezoidal, between two pieces of hollow floors between
Gap and surface layer are poured using plain concrete is whole, to strengthen floor globality, but due to prefabricated board is constructed and is constructed, it may appear that
Following technical problem and defect：
1. caking property is bad between plain concrete and prefabricated board, and surface layer is often disengaged；
2. plain concrete mobility is poor, and plumpness is not enough between plate stitch, is easily caused when building differential settlement or deformation
Floor ftractures, leak；
3. plain concrete easily plays drum, comes off, and decoration stage is often destroyed, and loses former design function, causes floor
Overall poor seismic behavior, it is easy to fall off during earthquake.
Last century Mo, China started housing industrialization construction New Wave, and according to incompletely statistics, the annual house of China is built
If amount is about 15 billion cubic meters, wherein urban housing construction amount accounts for 1/3, it is seen that housing industry is the important of Chinese national economy
Part.But precast concrete there is also the shortcoming of the following aspects：
(1) globality is poor
Precast concrete is that prefabricated components carry out assembled completion at the construction field (site), without well-designed assembled section
Point and construction quality it cannot be guaranteed that in the case of, be just easy to the situation for the globality poor of structure occur, it is past some ground
Earthquake centre finds that partial precast destroying concrete structure, than more serious, causes serious casualties and property loss.
(2) design difficulty is than larger
Because precast concrete technology is ripe not enough, precast concrete joint structure is more complicated, and design difficulty compares
Greatly, structure design personnel are familiar only with the method for designing of cast-in-place concrete structure, method for designing and spy to precast concrete
Point is stranger, and rare with precast concrete relevant design specification and standard comparing in industry.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of new prefabricated assembled concrete hollow floor
And preparation method thereof.
The present invention is for the used technical scheme that solves the above problems：There is provided a kind of new prefabricated assembled concrete many
Hole floor, including left side plate, intermediate plate and the right side plate being sequentially connected, are all provided with the left side plate, intermediate plate and right side plate
Through hole；The left side plate side is provided with upper left tongue and groove, the intermediate plate side lower tongue and groove in being provided with, during opposite side is provided with
Upper tongue and groove, the right side plate side is provided with bottom right tongue and groove；Lower tongue and groove coordinates with upper left tongue and groove in described, it is described in upper tongue and groove with
Bottom right tongue and groove coordinates；The upper left tongue and groove is both provided with grout hole with upper tongue and groove.
Concrete porous floor epithyrid include it is circular, square, trapezoidal etc., in order to increase the entirety of concrete porous floor
Property, spy assembled using prefabricated assembled hollow floor, left side plate that every group of assembled hollow floor includes being sequentially connected, in
Between plate and right side plate, every piece of assembled plate end is provided with tongue and groove, by between tongue and groove, assembled plate is realized in combination connection up and down
Between connection, realize the modularization of en-block construction, can increase reinforcing member of prefabricated porous globality, improve reinforcing member of prefabricated porous
Adaptability, upper left tongue and groove and in the grout hole that sets at upper tongue and groove be used for reperfusion serosity (slurries are generally cement mortar, from fluid
Deng adhesives), realize closely being connected between left side plate, intermediate plate and left side plate, and further improve the globality of structure.
Preferably, the left side plate being sequentially connected, the intermediate plate between intermediate plate, right side plate are multiple, institute
Lower tongue and groove upper tongue and groove with coordinates in stating two pieces of adjacent intermediate plates.
Preferably, it is both provided with deformed bar in the left side plate, intermediate plate and right side plate.Using deformed bar plus
The bearing capacity and stiffness of reinforced concrete hollow floor.
Preferably, the upper left tongue and groove, in be both provided with deformed bar, upper left tongue and groove lower tongue and groove group with upper tongue and groove
Assembling is closed, in upper tongue and groove coordinate with the assembling of bottom right tongue and groove, this set at two deformed bar can increase floor bearing capacity and
Rigidity, further lifts the globality of whole concrete porous floor.
Preferably, the left side plate and/or right side plate, intermediate plate two ends are connected with external support structure, and left side plate and/
Or right side plate, intermediate plate and external support structure junction are provided with grout hole, the grout hole is along left side plate and/or the right
Plate, intermediate plate length direction are evenly arranged with multiple grout holes, and slurries are irrigated by grout hole, realize left side plate and/or
The tight connection of right side plate, intermediate plate and external support structure junction, strengthens the globality of floor, and external support structure is general
Including beam or wall.
Preferably, the upper left tongue and groove is evenly arranged with multiple grout holes along left side plate length direction；Upper tongue and groove in described
Multiple grout holes are evenly arranged with along intermediate plate length direction, concrete porous floor along plate width direction except being provided with grouting
Hole, multiple grout holes are evenly arranged with along plate length direction, and distance is 500mm- between the two neighboring grout hole of plate length direction
800mm, the distance sets according to the size of shock strength, and general shock strength is higher, between two neighboring grout hole away from
From smaller, shock strength is lower, and the distance between two neighboring grout hole is bigger.
Preferably, the left side plate being sequentially connected, intermediate plate are identical with the right plate thickness.
Preferably, the left side plate being sequentially connected, intermediate plate and right side plate width are 400mm, 500mm, 600mm series
In any group of numerical value, certainly, the width of left side plate, intermediate plate and right side plate can be any number according to actual conditions.
Preferably, the thickness of the left side plate, intermediate plate and right side plate is any in 120mm, 130mm, 140mm, 150mm
Numerical value, certainly according to demand, the numerical value can be arbitrarily determined according to span and load.
Further, there is provided a kind of preparation method of new prefabricated assembled concrete hollow floor, comprise the following steps：
S01：Width and cross sectional shape according to left side plate, intermediate plate and right side plate hollow floor carry out stencil design and system
Make, hollow floor of the generation with grout hole；
S02：Colligation hollow floor bar frame, bellows is set in hollow floor bar frame；
S03：To pouring configured good concrete in hollow floor bar frame, and clear up bellows duct；
S04：Form removal, to the left side plate, intermediate plate and right side plate inner passing-setting pre-stressing tendon；
S05：Pre-stressing tendon tensioning, the pre-stressing tendon hole path pressure grouting of side plate, intermediate plate and right side plate to the left, in advance
Stress tendon end carries out port sealing by the slurry being pressed into；
S06：Using outside crane to the lifting of left side plate, intermediate plate and right side plate, storage；
S07：Polylith left side plate, intermediate plate and right side plate are sequentially connected combination, and grouting sealing is carried out from grout hole.
What the present invention brought has the beneficial effect that：The present invention sets tongue and groove by concrete porous floor both sides so that can be with
Realize that left side plate, intermediate plate and right side plate are sequentially connected by the cooperation up and down between tongue and groove, meet floor globality demand, carry
The adaptability of prefabricated assembled concrete hollow floor high, realizes the building standardization of assembly concrete prefabricated board, it is to avoid existing
There is hollow floor sheet separation larger, the phenomenon such as floor cracking, leak caused by settling or deforming inequality；Coordinate by tongue and groove
The grout hole set at place, concrete prefabricated board and external support structure carries out the perfusion of slurries, and between adjacent grout hole
Distance adjustment, realize the globality of concrete prefabricated board, be conducive to preventing the hardened structure easy to fall off under seismic loading
Defect；By setting deformed bar in concrete prefabricated board, the bearing capacity and stiffness of total is greatly increased,
The globality of total is improved, assembly concrete hollow floor of the present invention is mainly using the construction of typified form plane
Operation, with production efficiency is high, good product quality the characteristics of, using mechanization lifting, transport, can be same with live each professional construction
Step is carried out, fast with speed of application, the characteristics of engineering construction cycle is short, is combined especially through the assembled of three structure plates, real
Existing total is used building field is larger range of, for existing building provides one kind more preferably frame mode and its making side
Method, with good Social benefit and economic benefit.
Brief description of the drawings
Fig. 1 is a kind of new prefabricated assembled concrete hollow floor left side plate structure schematic diagram of the present invention；
Fig. 2 is plate structure schematic diagram in the middle of a kind of new prefabricated assembled concrete hollow floor of the present invention；
Fig. 3 is a kind of new prefabricated assembled concrete hollow floor the right plate structure schematic diagram of the present invention；
Fig. 4 is structural representation after a kind of new prefabricated assembled concrete hollow floor width assembly of the present invention；
Fig. 5 is structural representation after a kind of new prefabricated assembled concrete hollow floor length direction assembly of the present invention；
Fig. 6 is width structural representation after a kind of new prefabricated assembled concrete hollow floor assembly of the present invention.
Specific embodiment
Below in conjunction with specific accompanying drawing, the present invention is further illustrated.
Embodiment one
As Figure 1-4, there is provided a kind of new prefabricated assembled concrete hollow floor, including left side plate 1 (see Fig. 1),
Intermediate plate 2 (see Fig. 2), right side plate 3 (see Fig. 3) is all provided with circular hole 4 on left side plate 1, intermediate plate 2 and right side plate 3 and is embedded with pre-
Stress reinforcing bar 5, left side plate 1, intermediate plate 2 and the thickness of right side plate 3 are mutually all 120mm, and single plate width is 400mm；
As shown in figure 1, the right-hand member of left side plate 1 is provided with upper left tongue and groove 11, grout hole 6 is provided with upper left tongue and groove 11,
The right side of the grout hole 6 is embedded with deformed bar 5；
As shown in Fig. 2 the left end of intermediate plate 2 lower tongue and groove 21 in being provided with, right-hand member upper tongue and groove 22 in being provided with, on tongue and groove
Grout hole 6 is provided with 22, deformed bar 5 is embedded with the right side of the grout hole 6；
As shown in figure 3, the left end of right side plate 3 is provided with bottom right tongue and groove 31；
When being linked and packed, the upper left tongue and groove 11 of left side plate 1 is connected with lower tongue and groove 21 in intermediate plate 2, grouting liquid
Grout hole 6 from upper left tongue and groove 11 injects, and left side plate 1 is connected with intermediate plate 2, upper tongue and groove 22 and the right in intermediate plate 2
The bottom right tongue and groove 31 of plate 3 is connected, and the grout hole 6 that grouting liquid therefrom goes up at tongue and groove 22 injects so that intermediate plate 2 and right side plate
3 are connected.
As shown in figure 4, the assembly concrete for circulating the composition that is connected successively for left side plate 1, intermediate plate 2, right side plate 3 is porous
Floor, it is fixedly connected with external support structure 7 (wall or beam) both sides,
As shown in figure 5, in Fig. 4 left side plate 1, intermediate plate 2 circulated successively with right side plate 3 be connected constitute assembled coagulation
Native hollow floor along plate length direction structural representation, upper left tongue and groove 11, in grout hole 6 at upper tongue and groove 22 it is equal along plate length direction
The distance between even setting, two neighboring grout hole 6 D is 500mm-800mm, and the distance enters line number according to the requirement of shock strength
The adjustment of value is set, and general D is smaller, and shock resistance is bigger, and D is bigger, and shock resistance is smaller；(the wall of external support structure 7 of end
Body or beam) grout hole 6 is provided with and hollow floor between, injecting grouting liquid by the grout hole 6 causes hollow floor end
It is fixedly connected to form integration with external support structure 7, certainly, if plate long structure is more long, external support structure 7 can be set
In plate centre position long.
Embodiment two
As shown in Figure 6, there is provided a kind of new prefabricated assembled concrete hollow floor, including left side plate 1, intermediate plate 2, it is right
Side plate 3, is all provided with circular hole 4 and is embedded with deformed bar 5 on left side plate 1, intermediate plate 2 and right side plate 3, left side plate 1, intermediate plate
2 are mutually all 120mm with the thickness of right side plate 3, and single plate width is 500mm；It is single plate with the difference of the maximum of embodiment one
Wider width, it is adaptable to which space has a case that compared with large span demand.
Certainly according to demand, left side plate 1, intermediate plate 2, right side plate 3 can be any in 400mm, 500mm, 600mm series
One group of combination application of numerical value.
Further, the present invention provides a kind of preparation method of new prefabricated assembled concrete hollow floor, including following
Step：
S01：Width and cross sectional shape according to left side plate, intermediate plate and right side plate hollow floor carry out stencil design and system
Make, hollow floor of the generation with grout hole；
S02：Colligation hollow floor bar frame, bellows is set in hollow floor bar frame；
S03：To pouring configured good concrete in hollow floor bar frame, and clear up bellows duct；
S04：Form removal, to the left side plate, intermediate plate and right side plate inner passing-setting pre-stressing tendon；
S05：Pre-stressing tendon tensioning, the pre-stressing tendon hole path pressure grouting of side plate, intermediate plate and right side plate to the left, in advance
Stress tendon end carries out port sealing by the slurry being pressed into；
S06：Using outside crane to the lifting of left side plate, intermediate plate and right side plate, storage；
S07：Polylith left side plate, intermediate plate and right side plate are sequentially connected combination, and grouting sealing is carried out from grout hole.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Specific implementation of the invention is confined to these explanations, for those skilled in the art, is not taking off
On the premise of present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to protection of the invention
Scope.
Claims (10)
1. a kind of new prefabricated assembled concrete hollow floor, it is characterised in that：Including the left side plate, the intermediate plate that are sequentially connected
And right side plate, all it is provided with through hole on the left side plate, intermediate plate and right side plate；The left side plate side is provided with upper left tongue and groove,
The intermediate plate side lower tongue and groove in being provided with, opposite side upper tongue and groove in being provided with, the right side plate side is provided with bottom right enterprise
Mouthful；Lower tongue and groove coordinates with upper left tongue and groove in described, it is described in upper tongue and groove coordinate with bottom right tongue and groove；The upper left tongue and groove upper enterprise with
Grout hole is both provided with mouthful.
2. a kind of new prefabricated assembled concrete hollow floor according to claim 1, it is characterised in that：It is described successively
The left side plate of connection, the intermediate plate between intermediate plate, right side plate are multiple, in two pieces of adjacent intermediate plates lower tongue and groove with
In upper tongue and groove coordinate.
3. a kind of new prefabricated assembled concrete hollow floor according to claim 1, it is characterised in that：The left side
Deformed bar is both provided with plate, intermediate plate and right side plate.
4. a kind of new prefabricated assembled concrete hollow floor according to claim 3, it is characterised in that：The upper left
Tongue and groove, in be both provided with deformed bar at upper tongue and groove.
5. a kind of new prefabricated assembled concrete hollow floor according to claim 1, it is characterised in that：The left side
Plate and/or right side plate, intermediate plate both sides are connected with external support structure, and left side plate and/or right side plate, intermediate plate both sides with
External support structure junction is provided with grout hole, and the grout hole is equal along left side plate and/or right side plate, intermediate plate length direction
It is even to be provided with multiple grout holes.
6. a kind of new prefabricated assembled concrete hollow floor according to claim 1 or 4, it is characterised in that：It is described
Upper left tongue and groove is evenly arranged with multiple grout holes along left side plate length direction；Upper tongue and groove is uniform along intermediate plate length direction in described
It is provided with multiple grout holes.
7. a kind of new prefabricated assembled concrete hollow floor according to claim 1, it is characterised in that：It is described successively
Connected left side plate, intermediate plate are identical with the right plate thickness.
8. a kind of new prefabricated assembled concrete hollow floor according to claim 1, it is characterised in that：It is described successively
Connected left side plate, intermediate plate and right side plate width are any value in 400mm, 500mm, 600mm series.
9. a kind of new prefabricated assembled concrete hollow floor according to claim 7 or 8, it is characterised in that：It is described
The thickness of left side plate, intermediate plate and right side plate is any value in 120mm, 130mm, 140mm, 150mm.
10. a kind of preparation method of new prefabricated assembled concrete hollow floor, it is characterised in that：Comprise the following steps：
S01：Width and cross sectional shape according to left side plate, intermediate plate and right side plate hollow floor carry out stencil design and making,
Hollow floor of the generation with grout hole；
S02：Colligation hollow floor bar frame, bellows is set in hollow floor bar frame；
S03：To pouring configured good concrete in hollow floor bar frame, and clear up bellows duct；
S04：Form removal, to the left side plate, intermediate plate and right side plate inner passing-setting pre-stressing tendon；
S05：Pre-stressing tendon tensioning, to the left the pre-stressing tendon hole path pressure grouting of side plate, intermediate plate and right side plate, prestressing force
Tendon end carries out port sealing by the slurry being pressed into；
S06：Using outside crane to the lifting of left side plate, intermediate plate and right side plate, storage；
S07：Polylith left side plate, intermediate plate and right side plate are sequentially connected combination, and grouting sealing is carried out from grout hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306735.0A CN106930457A (en) | 2017-05-04 | 2017-05-04 | A kind of new prefabricated assembled concrete hollow floor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710306735.0A CN106930457A (en) | 2017-05-04 | 2017-05-04 | A kind of new prefabricated assembled concrete hollow floor and preparation method thereof |
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| Publication Number | Publication Date |
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| CN106930457A true CN106930457A (en) | 2017-07-07 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710306735.0A Pending CN106930457A (en) | 2017-05-04 | 2017-05-04 | A kind of new prefabricated assembled concrete hollow floor and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112519300A (en) * | 2020-11-12 | 2021-03-19 | 一重集团天津重工有限公司 | Extruder nozzle measuring and matching method |
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|---|---|---|---|---|
| GB191513497A (en) * | 1915-09-22 | 1916-04-13 | Nicolai Molotiloff | Detachable Reinforced Concrete Flooring. |
| GB310131A (en) * | 1928-02-23 | 1929-04-25 | Granwood Flooring Company Ltd | Improvements in, or relating to, floors, roads, pavements and the like |
| CN2457254Y (en) * | 2000-11-09 | 2001-10-31 | 赵春林 | Plug-in type floor |
| US20040217500A1 (en) * | 2002-04-11 | 2004-11-04 | Sinclair Robert F. | System and process for manufacturing building blocks |
| CN103541433A (en) * | 2013-09-22 | 2014-01-29 | 沈阳建筑大学 | Fabricated concrete hooking type joint |
| CN106121107A (en) * | 2016-08-17 | 2016-11-16 | 沈阳建筑大学 | Assemble type concrete slab and plate dry type method of attachment thereof |
| CN206769151U (en) * | 2017-05-04 | 2017-12-19 | 浙江大学建筑设计研究院有限公司 | A kind of new prefabricated assembled concrete hollow floor |
-
2017
- 2017-05-04 CN CN201710306735.0A patent/CN106930457A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191513497A (en) * | 1915-09-22 | 1916-04-13 | Nicolai Molotiloff | Detachable Reinforced Concrete Flooring. |
| GB310131A (en) * | 1928-02-23 | 1929-04-25 | Granwood Flooring Company Ltd | Improvements in, or relating to, floors, roads, pavements and the like |
| CN2457254Y (en) * | 2000-11-09 | 2001-10-31 | 赵春林 | Plug-in type floor |
| US20040217500A1 (en) * | 2002-04-11 | 2004-11-04 | Sinclair Robert F. | System and process for manufacturing building blocks |
| CN103541433A (en) * | 2013-09-22 | 2014-01-29 | 沈阳建筑大学 | Fabricated concrete hooking type joint |
| CN106121107A (en) * | 2016-08-17 | 2016-11-16 | 沈阳建筑大学 | Assemble type concrete slab and plate dry type method of attachment thereof |
| CN206769151U (en) * | 2017-05-04 | 2017-12-19 | 浙江大学建筑设计研究院有限公司 | A kind of new prefabricated assembled concrete hollow floor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112519300A (en) * | 2020-11-12 | 2021-03-19 | 一重集团天津重工有限公司 | Extruder nozzle measuring and matching method |
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