CN107548798B - Improvement type straw building block sunlight greenhouse back wall - Google Patents
Improvement type straw building block sunlight greenhouse back wall Download PDFInfo
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- CN107548798B CN107548798B CN201710805176.8A CN201710805176A CN107548798B CN 107548798 B CN107548798 B CN 107548798B CN 201710805176 A CN201710805176 A CN 201710805176A CN 107548798 B CN107548798 B CN 107548798B
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- 239000010902 straw Substances 0.000 title claims abstract description 133
- 230000006872 improvement Effects 0.000 title description 5
- 239000000835 fiber Substances 0.000 claims abstract description 54
- 238000009413 insulation Methods 0.000 claims abstract description 34
- 238000005338 heat storage Methods 0.000 claims abstract description 22
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 13
- 239000008397 galvanized steel Substances 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 8
- 229920006255 plastic film Polymers 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
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- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000004907 flux Effects 0.000 description 7
- 238000004321 preservation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
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- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
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- 238000012360 testing method Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000004570 mortar (masonry) Substances 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
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- 239000002352 surface water Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Abstract
The invention discloses an improved straw building block solar greenhouse rear wall which comprises a heat storage layer, a heat insulation layer and a heat insulation layer, wherein galvanized steel pipe upright posts and tie bars on the inner side of the rear wall are removed, and longitudinal beams and fixed supports are connected with the inner side of the rear wall. Wherein, the support is fixed in the I-shaped straw building block. The straw fiber of the improved II-type straw building block is crushed straw fiber with the sieve pore diameters of 20mm and 2mm respectively according to the mass ratio of 1: 1 to 5. The galvanized steel pipe on the inner side of the rear wall of the straw building block is removed, so that the heat bridge effect is avoided, and the heat loss in the greenhouse is reduced; the II-type straw building block is improved, the workability of the building block is improved, and the building block manufacturing efficiency is increased. Therefore, the invention can reduce the heat loss of the rear wall of the straw building block and improve the construction efficiency of the wall body.
Description
Technical Field
The invention relates to a sunlight greenhouse rear wall, in particular to an improved straw block sunlight greenhouse rear wall.
Background
The greenhouse back wall has an important effect on maintaining indoor night high temperature, stores heat in the daytime, releases heat indoors at night, and is an essential component of a sunlight greenhouse. The rear wall structure of the current sunlight greenhouse mostly adopts a rammed earth wall and a clay brick wall, the thickness of the rammed earth wall is 5-8m, and the land utilization rate is low; the clay resources of the clay brick are damaged in the processes of soil taking and firing, and the carbon dioxide emission is high. Meanwhile, China is a big agricultural country, and the yield of straws is about 8 hundred million tons every year. The straw material has low heat conductivity coefficient and strong moisture absorption capacity, and can be used as a wall material of a building. However, due to the lack of an effective way for utilizing straw materials, the condition of burning straws in the field often occurs in rural areas, which causes waste of straw resources, air pollution and damage to the physicochemical properties of soil.
Galvanized steel pipe stand columns are adopted on the inner side and the outer side of the rear wall of the sunlight greenhouse, and tie bars are connected, so that a heat bridge effect is easily formed, and indoor heat loss to the outdoor environment is increased. The applicant applies for a straw block sunlight greenhouse rear wall (publication number CN 105297947A), as shown in fig. 1 and fig. 2, the straw block sunlight greenhouse rear wall comprises a heat storage layer 1, a heat insulation layer 2 and a heat insulation layer 3, wherein the heat insulation layer is formed by building II-type straw blocks, the II-type straw blocks are made of straw fibers with 20mm sieve pores, the breaking strength of the blocks is high, but the flowability and cohesiveness of the straw fibers are poor, and the workability of the blocks is influenced. The straw fiber has certain elasticity, the volume of the building block is enlarged in the building block manufacturing process, and the building block manufacturing difficulty is increased. In addition, set up stand 5 along back wall length direction equidistant in the both sides of back wall, stand 5 that inside and outside bilateral symmetry set up passes through longeron 6 and lacing wire 8 and connects to in the back wall, outside stand and lacing wire form the heat bridge effect, increase the indoor heat loss of greenhouse.
Disclosure of Invention
The invention aims to utilize rural waste straw materials as resources, replace clay building blocks on the rear wall of a sunlight greenhouse and improve the heat insulation performance of the greenhouse; meanwhile, the rear wall structure of the sunlight greenhouse is optimized, the side upright posts of the heat storage layer are removed, II-type straw building blocks for building the heat insulation layer are optimized, heat loss in the greenhouse is reduced, the workability of the II-type straw building blocks is improved, and the building block manufacturing efficiency is improved.
The purpose of the invention is realized by the following technical scheme:
an improvement type straw building block sunlight greenhouse back wall gets rid of the tie bar of back wall inboard stand and connection inside and outside both sides stand, and the outside stand passes through longeron and fixing support and links to each other with the back wall inboard, and the support is fixed in I type straw building block.
An improved straw block sunlight greenhouse rear wall comprises a heat storage layer, a heat insulation layer and a heat insulation layer from inside to outside, wherein the heat storage layer, the heat insulation layer and the heat insulation layer are built by I-type straw blocks, the heat storage layer and the heat insulation layer are separated by the heat insulation layer, and the heat insulation layer is filled by polystyrene boards; the upright posts are arranged on the outer side of the rear wall at equal intervals along the length direction of the rear wall, the upright posts are connected with the inner side of the rear wall through longitudinal beams and fixed supports, and the supports are fixed in the I-shaped straw building blocks; the heat-insulating layer is built by improved II-type straw building blocks; the heat preservation outside set gradually wire netting, draw-in groove and plastic film, the draw-in groove level sets up and is fixed by the stand, plastic film fix on the draw-in groove by the greenhouse jump ring.
The I-shaped straw building block is prepared from I-shaped straw fibers, cement and sand according to the mass ratio of 1: 6-9: 15-24; the I-type straw fiber is prepared by crushing a straw crusher with the sieve pore diameter of 20 mm.
Preferably, the I-shaped straw building block is prepared from I-shaped straw fibers, cement and sand according to a mass ratio of 1: 9: 24.
The improved II-type straw building block is prepared from II-type straw fibers and cement according to the mass ratio of 1: 1.5-2.5; the II-type straw fiber is prepared by mixing straw fiber crushed by a 20mm sieve mesh and straw fiber crushed by a 2mm sieve mesh according to the mass ratio of 0.2-2: 1 are mixed.
Preferably, the improved II-type straw building block is prepared from II-type straw fibers and cement according to a mass ratio of 1: 1.5.
Preferably, the type II straw fibers are straw fibers crushed by a 20mm sieve mesh and straw fibers crushed by a 2mm sieve mesh according to a mass ratio of 1: 1-5, and mixing. Further preferably, the modified II-type straw block straw fiber is prepared by mixing straw fiber crushed by a 20mm sieve pore and straw fiber crushed by a 2mm sieve pore according to a mass ratio of 1:2, mixing the components.
Two adjacent columns are spaced by 1.2 m. Preferably, the upright post is a galvanized steel pipe.
The fixed support is composed of a steel plate and reinforcing steel bars which are vertically welded at four corners of the steel plate respectively. Fixing support correspond the equidistant setting of stand in the back wall outside, fixing support's steel sheet and longeron welded fastening, the heat accumulation layer of longeron and back wall inboard is fixed through fixing support's reinforcing bar.
The invention has the beneficial effects that:
according to the invention, the galvanized steel pipe upright columns and the tie bars on the inner side of the rear wall are removed, and the galvanized steel pipe upright columns on the outer side are connected with the inner side of the rear wall through the longitudinal beams and the fixed support, so that the stability of the upright columns on the outer side is increased, the phenomenon that the inner and outer galvanized steel pipe upright columns and the tie bars form a heat bridge effect is avoided, and the heat loss in a greenhouse is reduced. Meanwhile, in the building process of the straw block rear wall heat storage layer, the construction process efficiency of the rear wall heat storage layer is higher due to the fact that the blocking effect of the inner side stand columns is avoided, and the construction cost of the inner side stand columns is reduced. The straw fiber composition of the heat-insulating layer II-type straw building block is optimized, the volume expansion of the building block is reduced, the workability of the building block is improved, and the building block manufacturing efficiency is improved.
According to the invention, the galvanized steel pipe upright posts and the tie bars on the inner side of the rear wall are removed, the construction cost of the inner upright posts is reduced, the building difficulty of the inner heat storage layer (I-shaped straw building block) due to the use of the inner upright posts is reduced, the construction period is shortened, and the construction cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of a back wall of an original straw building block;
FIG. 2 is a longitudinal cross-sectional view of the rear wall of the straw block of FIG. 1;
in the figures 1-2, 1-heat storage layer, 2-heat insulation layer, 3-heat insulation layer, 4-wire netting, 5-upright post, 6-longitudinal beam, 7-plastic film and 8-lacing wire.
FIG. 3 is a schematic view of the structure of the improved straw block back wall;
in figure 3, 1 is a heat storage layer, 2 is a heat insulation layer, 3 is a heat insulation layer, 5 is an upright post, 6 is a longitudinal beam, and 9 is a fixed support.
FIG. 4 is a schematic view of the outside of the modified straw block back wall of FIG. 3;
in FIG. 4, 3 is an insulating layer, 4 is a wire mesh, 5 is a column, and 7 is a plastic film.
FIG. 5 is a graph showing the heat flux density change of the outer surface of the rear wall and the outer pillars.
Fig. 6 is a graph of the total heat flux density transferred from the outer surface of the rear wall and the outer pillars to the outside.
Detailed description of the preferred embodiments
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 3 and 4, the improved straw block sunlight greenhouse rear wall comprises a heat storage layer 1, a heat insulation layer 2 and a heat insulation layer 3 from inside to outside, wherein the heat storage layer 1 and the heat insulation layer 3 are separated by the heat insulation layer 2, and the heat insulation layer 2 is filled with polystyrene boards; the upright posts 5 are arranged on the outer side of the rear wall at equal intervals along the length direction of the rear wall; the upright post 5 is connected with the inner side of the rear wall through the longitudinal beam 6 and the fixed support 9, wherein the longitudinal beam 6 and the fixed support 9 are connected together in a welding mode, and the fixed support 9 is fixed in the I-shaped straw building block through reinforcing steel bars at four corners of the fixed support 9, so that the upright post 5 on the outer side of the greenhouse is fixed with the heat storage layer 1 on the inner side of the rear wall through the longitudinal beam 6, and the stability of the upright post on the outer side is improved; the heat preservation 3 outside set gradually wire netting 4, draw-in groove and plastic film 7, the draw-in groove level sets up and is fixed by stand 5, plastic film 7 fix on the draw-in groove by the greenhouse jump ring.
Wherein, the upright columns 5 are galvanized steel pipes, and the interval between two adjacent upright columns is 1.2 m; the fixed support 9 is composed of a steel plate and reinforcing steel bars vertically welded at four corners of the steel plate, and the fixed support 9 is arranged at equal intervals corresponding to the upright columns 5 on the outer side of the rear wall.
The heat storage layer 1 is built by I-shaped straw building blocks, and the I-shaped straw building blocks are formed by m (I-shaped straw fiber): m (cement): m (sand): m (water) ═ 1: 9: 24: 4, and the I-type straw fiber is prepared by crushing the straw by a straw crusher with the sieve pore diameter of 20 mm. The compressive strength of the I-type straw building block is measured by adopting a universal mechanical testing machine, and the compressive strength is 0.1N mm-2. The heat-insulating layer 3 is built by improved II-type straw building blocks; improving the II type straw building block according to the formula m (II type straw fiber): m (cement): m (water) ═ 1: 1.5: 2.5 proportion of the raw materials are uniformly mixed to prepareThe II-type straw fiber is prepared by crushing straw fibers with 20mm sieve pores and 2mm sieve pores according to the mass ratio of 1: 2. Wherein the cement is ordinary Portland cement 32.5, the water is medium-alkaline surface water, and the sand is yellow building sand.
The height of the rear wall is 2.8m, and the thickness is 0.5 m; the heat storage layer is 0.24m, the heat insulation layer is 0.1m, and the heat insulation layer is 0.16 m; the length is 45 m.
Inspection of self-weight and wall bearing capacity of greenhouse structure
The front and back roofs of the sunlight greenhouse are composed of a steel arch frame, a heat preservation quilt and a back wall body. Dead weight calculation of the steel arch frame, the heat preservation quilt and the wall body of the rear wall is carried out, and is shown in formulas (1), (2) and (3).
U-shaped steel arch frame dead weight (W)J；kN)：
WJ＝ρ×V×g (1)
Wherein rho is the density of the steel with the shape of a Chinese character 'ji', 7850kg m-3(the steel with the shape of Chinese character 'ji' is a hot-dip galvanized steel material); v is volume, 1.539m3(ii) a g is gravity coefficient, 9.8 N.kg-1And the calculation result is as follows: wJWas 118.4 kN.
Self-weight of heat preservation quilt (W)B；kN)：
WB＝ρ×V×g (2)
Wherein ρ is density of 100kg · m-3(ii) a V is the volume, 21.6m3(ii) a g is gravity coefficient, 9.8 N.kg-1And the calculation result is as follows: wBWas 21.2 kN.
Dead weight of rear wall (W)Q；kN)：
WQ＝ρ×V×g (3)
Wherein ρ is density, 1526kg · m-3The density is obtained by measuring the volume and calculating the mass after the building block is manufactured; v is volume, 30.24m3(ii) a g is gravity coefficient, 9.8 N.kg-1And the calculation result is as follows: wQIt was 452.2 kN.
The rear wall is built by adopting M2.5 mixed mortar, and the bearing capacity of the rear wall is calculated in the following mode. Wall height to thickness ratio (β):
β＝H0/h (4)
wherein; h0The height of the wall body is 2.8m, h is the thickness of the wall of the heat storage layer, 0.24m, β -11.7<[β]When e/h is 0, e is the eccentricity in the thickness direction of the cross section, the influence coefficient is known by looking up a table, referring to masonry structure (2016, Harbin university Press) by Zhao Miao Hua
The compressive strength f of the I-type straw building block is 0.1 N.mm-2。
The cross-sectional area of the heat storage layer is 0.24 × 45 m-10.8 m2＞0.3m2Wherein 0.24m is the thickness of the heat storage layer, and 45m is the length of the greenhouse.
Rear wall bearing (W)C(ii) a kN) is shown as (3.5):
wherein,
0.79 for coefficient of influence; f is compressive strength, 0.1 N.mm-2(ii) a A is the cross-sectional area, 10.8m2. Knowing the load bearing W of the back wallCIs 853.2 kN.
Rear wall bearing WCFar greater than (W)J+WB+WQ) Meanwhile, the greenhouse gable wall and the front roof foundation can bear the dead weight of part of the inverted V-shaped steel and the heat preservation quilt. Therefore, the straw block rear wall heat accumulation layer can support the self weight of the greenhouse structure, and the improved design scheme of the rear wall structure for removing the galvanized steel pipe upright columns on the inner side of the rear wall is feasible.
Investigation of improvement of straw fiber composition in II-type straw building block
In the improvement process of the composition of the straw fibers in the II-type straw building block, the mass ratio of the II-type straw fibers to the ordinary portland cement is 1: 1.5, make II type straw building blocks in 150mm x 150 mm's cube mould, II type straw fibre comprises sieve mesh diameter for 20mm kibbling straw fibre and sieve mesh diameter for 2mm kibbling straw fibre, and sieve mesh diameter is 20mm kibbling straw fibre and sieve mesh diameter for 2mm kibbling straw fibre's mass ratio is 6 respectively: 0. 5: 1. 4: 2. 3: 3. 2: 4. 1: 5 and 0: 6, the total amount of the straw fiber is 0.4 kg. As can be seen from Table 1: along with the reduction of the using amount of the straw fiber crushed with the diameter of the sieve pore of 20mm, the height of the building block is gradually reduced, the expansibility of the building block is reduced, and the workability of the building block is increased; but the proportion of the II-type straw fibers with larger major diameters is reduced, so that the breaking strength of the building block is reduced, and cracks are easy to appear. The heat conductivity coefficient and the thermal conductivity coefficient of the straw fiber building blocks with different proportions have no obvious difference, which shows that the change of the fiber composition has no obvious influence on the heat insulation performance of the building blocks. Therefore, the workability and the breaking strength in the manufacturing process of the II-type straw building block are comprehensively improved, and the mass ratio of the crushed straw fibers with the sieve pore diameter of 20mm to the crushed straw fibers with the sieve pore diameter of 2mm is 1: 1-5 as a better ratio, 2:4 (whether to change 2:4 to 1:2) is taken as the optimal proportioning.
TABLE 1 influence of straw fibres of different proportions on the height, thermal conductivity and thermal conductivity of type II straw blocks
Note: different lower case letters in the same column indicate significant differences.
The change conditions of heat flux density of the external surface (II type straw block) of the rear wall (publication No. CN 105297947A) and the external upright post of the rear wall of the straw block sunlight greenhouse transferring heat outwards at night (17: 00-8: 00 the next day) are examined. The test was carried out using a heat flux density sensor (Hukseflux, netherlands) to measure the heat flux density at night, and data was recorded every 10min using a CR3000 data collector. The upright post measuring point is 1.4m away from the ground, and the outer surface measuring point of the straw back wall is 1.4m away from the ground and is at the midpoint of the two upright posts. The measurement time is 3 months 19-3 months 25 days. The test data is processed by Excel 2013 software, and a data curve is drawn by Origin software.
Fig. 5 shows the results of the following steps, wherein a day 17: the heat flow density of 00 to 8:00 of the next day, as can be seen from FIG. 5, the maximum value of the heat flow density of the outer column is 34.8W m-2And the maximum value of the heat flux density of the outer surface of the back wall is 19.1W m-2And at the same moment, the heat flux density of the outer side upright post at night is obviously higher than that of the outer surface of the rear wall. FIG. 6 is a graph showing the total heat transfer density from the outer surface of the rear wall of the straw block and the outer galvanized pipe (upright) to the outside during the test, and it can be seen that the heat transfer from the outer upright to the outside is 5774 W.m higher than that from the outer surface of the rear wall-2The heat loss increased by 76.6%. Therefore, if the upright columns are arranged on the inner side of the greenhouse, due to the effect of the heat bridge, the inner upright columns conduct heat to the outer galvanized steel pipe through the longitudinal beams and the tie bars, so that the heat loss in the greenhouse can be obviously increased, and the heat preservation and heat insulation performance of the greenhouse is influenced.
Claims (9)
1. An improved straw block sunlight greenhouse rear wall comprises a heat storage layer, a heat insulation layer and a heat insulation layer from inside to outside, wherein the heat storage layer, the heat insulation layer and the heat insulation layer are built by I-type straw blocks, the heat storage layer and the heat insulation layer are separated by the heat insulation layer, and the heat insulation layer is filled by polystyrene boards; the straw building block is characterized in that upright columns are arranged on the outer side of the rear wall at equal intervals along the length direction of the rear wall, the upright columns are connected with the inner side of the rear wall through longitudinal beams and fixed supports, each fixed support is composed of a steel plate and reinforcing steel bars which are vertically welded at four corners of the steel plate, and the supports are fixed in I-shaped straw building blocks; the heat-insulating layer is built by improved II-type straw building blocks; the heat-insulating layer is characterized in that an iron wire mesh, a clamping groove and a plastic film are sequentially arranged on the outer side of the heat-insulating layer, the clamping groove is horizontally arranged and fixed by an upright post, and the plastic film is fixed on the clamping groove by a clamp spring;
the improved II-type straw building block is prepared from II-type straw fibers and cement according to the mass ratio of 1: 1.5-2.5; the II-type straw fiber is prepared by mixing straw fiber crushed by a 20mm sieve mesh and straw fiber crushed by a 2mm sieve mesh according to the mass ratio of 0.2-2: 1 are mixed.
2. The improved straw building block solar greenhouse back wall as claimed in claim 1, wherein the I-shaped straw building block is prepared from I-shaped straw fiber, cement and sand according to a mass ratio of 1: 6-9: 15-24; the I-type straw fiber is prepared by crushing a straw crusher with the sieve pore diameter of 20 mm.
3. The improved straw building block solar greenhouse back wall as claimed in claim 2, wherein the I-shaped straw building block is prepared from I-shaped straw fiber, cement and sand according to a mass ratio of 1: 9: 24.
4. The improved straw building block solar greenhouse rear wall as claimed in claim 1, wherein the improved II type straw building block is prepared by mixing II type straw fiber and cement according to a mass ratio of 1: 1.5.
5. The improved straw building block solar greenhouse back wall as claimed in claim 1, wherein the type II straw fibers are formed by crushing straw fibers with 20mm sieve holes and straw fibers with 2mm sieve holes according to a mass ratio of 1: 1-5, and mixing.
6. The improved straw building block solar greenhouse back wall as claimed in claim 5, wherein the modified type II straw building block straw fiber is formed by crushing straw fiber with 20mm sieve holes and straw fiber with 2mm sieve holes according to the mass ratio of 1:2, mixing the components.
7. The improved straw building block solar greenhouse rear wall as claimed in claim 1, wherein the interval between two adjacent vertical columns is 1.2 m.
8. The improved straw building block solar greenhouse back wall as claimed in claim 1, wherein the upright posts are galvanized steel pipes.
9. The improved straw building block solar greenhouse back wall as claimed in claim 1, wherein the fixing supports are arranged at equal intervals corresponding to the pillars on the outer side of the back wall.
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| CN204090634U (en) * | 2014-09-19 | 2015-01-14 | 辛彩红 | The building block of view fence |
| CN105297947A (en) * | 2015-11-30 | 2016-02-03 | 南京农业大学 | Novel sunlight greenhouse rear wall made of straw blocks |
| CN106912322A (en) * | 2017-03-27 | 2017-07-04 | 南京农业大学 | Half reassembling type rear wall of greenhouse |
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|---|---|
| CN107548798A (en) | 2018-01-09 |
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