CN214006348U - Stone material whiskering water conservancy diversion structure - Google Patents
Stone material whiskering water conservancy diversion structure Download PDFInfo
- Publication number
- CN214006348U CN214006348U CN202023074693.9U CN202023074693U CN214006348U CN 214006348 U CN214006348 U CN 214006348U CN 202023074693 U CN202023074693 U CN 202023074693U CN 214006348 U CN214006348 U CN 214006348U
- Authority
- CN
- China
- Prior art keywords
- stone
- water conservancy
- conservancy diversion
- saltpetering
- cement mortar
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a stone material saltpetering water conservancy diversion structure, include the wall and be located the finish coat outside the wall, the finish coat includes cement mortar layer and stone material, the stone material passes through the even subsides of cement mortar layer and locates on the wall, be equipped with many vertical settings in the finish coat and the water conservancy diversion hole that link up from top to bottom to in forming the water supply intraformational saltpetering water slurry exhaust water conservancy diversion passageway, the water conservancy diversion hole is located the boundary position department of cement mortar layer and stone material, and many water conservancy diversion holes set up along the length direction interval of finish coat. The utility model discloses can effectively prevent the stone material and take place the saltpetering phenomenon.
Description
Technical Field
The utility model relates to a stone material construction technical field, concretely relates to stone material whiskering water conservancy diversion structure.
Background
With the rapid development of modern gardens and the high-end pursuit of living standards of people, almost every landscape project has the following: planting pond, scenery wall, waterscape fountain, enclosure, bridge and the like, and the veneering is usually stone veneering. The natural stone is usually marble, granite, etc., because the crystallization of the natural stone is relatively coarse, and a plurality of capillary pores exist inside, when the stone is paved by a wet pasting method, chemical substances such as alkali, salt, etc. in the bonding material of cement mortar permeate into the stone along the capillary pores of the stone along with moisture to form whiskering slurry, and after the moisture is evaporated, the alkali and salt substances are deposited inside and on the surface of the stone, so that the surface of the stone is whitish, hazy in gloss, white in condensation, crystallization, etc. whiskering phenomena are caused.
The scale phenomenon is mainly caused by that the necessary stone protection treatment is not carried out before the construction, the scale phenomenon of the stone is solved, the standard requirement in the building construction is that the stone needs to be soaked in the protective agent for several hours, and the protective agent is fully soaked into capillary holes of the stone, but the method is labor-consuming and time-consuming, in the actual construction, workers usually scrape the protective agent once on the back of the stone, and the actual scale prevention effect is not good. Therefore, it is important to have a structure capable of preventing the stone from being saltpetering.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: provides a stone whiskering diversion structure which can effectively prevent the stone from whiskering.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a stone material whiskering water conservancy diversion structure, includes the wall and is located the finish coat outside the wall, the finish coat includes cement mortar layer and stone material, the stone material passes through the even subsides of cement mortar layer and locates on the wall, be equipped with many vertical settings and the water conservancy diversion hole that link up from top to bottom in the finish coat to in forming the water supply cement mortar intraformational whiskering thick liquid exhaust water conservancy diversion passageway, the water conservancy diversion hole is located the juncture position department of cement mortar layer and stone material, and many water conservancy diversion holes set up along the length direction interval of finish coat.
The concrete construction steps of paving and pasting the stone are as follows: (1) pre-treatment, namely removing impurities from the surface of the stone, cleaning, and cleaning the wall surface to be paved with the stone; (2) positioning the stay wires, arranging transverse wires and longitudinal wires on the wall surface according to the size of the stone to be pasted, wherein the area formed by each transverse wire and each longitudinal wire is used for paving and pasting the stone; (3) pre-smearing a plurality of vertical cement mortar strips on two sides of each vertical line on the wall surface respectively, and after the cement mortar strips are initially set; arranging a plurality of vertical guide rods on the cement mortar strips at intervals, enabling the guide rods to be attached to the cement mortar strips, fully coating a layer of release agent on the outer walls of the guide rods, enabling the lower end of each guide rod to be in contact with the bottom of the wall surface, and enabling the upper end of each guide rod to extend out of the top of the wall surface; (4) paving vertical face stones, paving a cement mortar layer on the wall surface, paving a row of stones on the bottom of the wall surface along the length direction when the stones are paved, preliminarily fixing the guide rods, then sequentially sticking the stones on the wall surface from bottom to top, and enabling the back faces of the stones to be in contact with the corresponding guide rods; (5) forming a flow guide hole, taking out the flow guide rod after the cement mortar layer is initially set, and forming a vertical flow guide hole for discharging the saltpetering slurry between the stone and the cement mortar layer; (6) and (4) capping, finally paving a layer of cement mortar on the top of the wall surface, and then tiling and jacking the stone material to finish the top sealing of the wall surface.
This scheme mainly is applicable to the wet construction operation that pastes of facade view of stone material, improve in the structure of following stone material construction operation in this scheme, through arrange many water conservancy diversion poles in advance before cement mortar layer, then treat cement mortar layer initial set back, take out the water conservancy diversion pole, just formed many confession saltpeter thick liquid exhaust water conservancy diversion holes between cement mortar layer and stone material, the pass in water conservancy diversion hole can be circular, also can be for rectangle or square etc. thereby avoided the saltpeter thick liquid to get into the inside saltpeter phenomenon that takes place of stone material through the water conservancy diversion hole. Generally, the alkali-efflorescence protection of the stone is generally improved from the material, and various protective agents are coated on the back of the stone to prevent the alkali-efflorescence phenomenon of the stone. And utilize the water conservancy diversion hole that forms between mortar layer and stone material in this scheme, the saltpetering thick liquid just can be discharged through this water conservancy diversion hole like this. Because the density of wall surface layer and stone material is great relatively, and the water conductivity is relatively poor, consequently under the prerequisite that the water conservancy diversion hole exists, the saltpetering thick liquid that produces in the mortar layer is changeed to the water conservancy diversion hole department naturally and is assembled, then the saltpetering thick liquid under the action of gravity, from last to flowing to the wall bottom and discharging down to the saltpetering phenomenon has been avoided the saltpetering thick liquid to soak the inside saltpetering phenomenon that appears of stone material. And the top of the flow guide hole can be ensured to be closed by the top pressing stone, so that the mortar layer is prevented from being corroded by external rainwater.
And optimally, the diversion holes are positioned in the cement mortar layer and close to one side of the back surface of the stone.
Like this, through inserting the guide rod is pre-buried to establish in cement mortar layer, the guide rod forms this water conservancy diversion hole after taking out, and this water conservancy diversion hole is close to in stone material one side moreover, and the saltpeter thick liquid in cement mortar layer and the stone material alright discharge through the intraformational guide hole of cement mortar directly, has reduced the saltpeter thick liquid and has soaked the inside probability of stone material.
As optimization, one part of the diversion holes is positioned in the stone, and the other part of the diversion holes is positioned in the cement mortar layer.
Like this, can set up the recess at the stone material back specifically when the construction, the partial holding of water conservancy diversion pole is in the recess, and water conservancy diversion pole partly protrusion is outside the recess, and the water conservancy diversion hole part that forms like this is arranged in the stone material, and another part is arranged in cement mortar layer to more do benefit to the saltpetering thick liquid between cement mortar layer and stone material and discharge from the water conservancy diversion hole, increased the water conservancy diversion area of saltpetering thick liquid, improve the discharge capacity of saltpetering thick liquid, greatly reduced the stone material and taken place the probability of saltpetering phenomenon.
Preferably, the diversion holes are formed in the stone and close to one side of the back of the stone.
Like this, when concrete construction, can open in the stone material and establish the storage tank, in the storage tank at the stone material back with the cooperation of water conservancy diversion pole, avoid cement mortar to get into the storage tank through the water conservancy diversion pole, the back is taken out to the water conservancy diversion pole, and the storage tank has just formed the water conservancy diversion hole, and the water conservancy diversion hole is located the stone material back like this, can play the drainage effect to the saltpetering thick liquid equally, mainly is applicable to and uses under the thinner condition in mortar layer, but the intraformational saltpetering thick liquid of cement mortar is difficult for relatively following the water conservancy diversion hole and flows.
Preferably, the left side and the right side of the stone in the length direction are respectively provided with at least one flow guide hole.
Like this, because the mortar joint position department between the adjacent stone material of left and right sides does not have the shielding of stone material, consequently this region is the weak region that the saltpetering thick liquid spills over, and most saltpetering thick liquid all easily overflows in this region, consequently sets up a water conservancy diversion hole respectively in stone material length direction's the left and right sides, and every vertical mortar joint position department all has two water conservancy diversion holes like this to can be with the saltpetering thick liquid in region abundant water conservancy diversion to the water conservancy diversion downthehole, discharge to the outside by the water conservancy diversion hole. When the length of the stone is more than 600mm, a diversion hole can be arranged at the middle position of the stone in the length direction to ensure the diversion capability of the saltpetering slurry. The distance between adjacent diversion holes is not more than 600 mm.
As optimization, the top of the wall surface is also covered with a top pressing stone, the top pressing stone is covered on the top of the wall surface, and the top of the flow guide hole is sealed.
Like this, the top that pushes up the stone material and can guarantee the water conservancy diversion hole is sealed, avoids external rainwater to corrode cement mortar layer.
To sum up, the beneficial effects of the utility model reside in that: through arranging many water conservancy diversion poles in advance before the cement mortar layer, then treat cement mortar layer initial set back, take out the water conservancy diversion pole, just formed many confession saltpetering thick liquid exhaust water conservancy diversion holes between cement mortar layer and stone material to the saltpetering thick liquid has been avoided getting into the inside saltpetering phenomenon that takes place of stone material. Generally, the alkali-efflorescence protection of the stone is generally improved from the material, and various protective agents are coated on the back of the stone to prevent the alkali-efflorescence phenomenon of the stone. And utilize the water conservancy diversion hole that forms between mortar layer and stone material in this scheme, the saltpetering thick liquid just can be discharged through this water conservancy diversion hole like this. Because the density of wall surface layer and stone material is great relatively, and the water conductivity is relatively poor, consequently under the prerequisite that the water conservancy diversion hole exists, the saltpetering thick liquid that produces in the mortar layer is changeed to the water conservancy diversion hole department naturally and is assembled, then the saltpetering thick liquid under the action of gravity, from last to flowing to the wall bottom and discharging down to the saltpetering phenomenon has been avoided the saltpetering thick liquid to soak the inside saltpetering phenomenon that appears of stone material. And the top of the flow guide hole can be ensured to be closed by the top pressing stone, so that the mortar layer is prevented from being corroded by external rainwater.
Drawings
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, in which:
fig. 1 is a side cross-sectional view of the present invention;
FIG. 2 is a cross-sectional view of the first embodiment A-A of FIG. 1;
FIG. 3 is a cross-sectional view of embodiment two of A-A of FIG. 1;
FIG. 4 is a cross-sectional view of embodiment three of A-A in FIG. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reference numerals in the drawings of the specification include: wall 1, cement mortar layer 2, stone material 3, water conservancy diversion hole 4.
A stone material saltpetering water conservancy diversion structure among this embodiment, as shown in fig. 1 and fig. 2, include wall 1 and be located the outer finish coat of wall 1, the finish coat includes cement mortar layer 2 and stone material 3, stone material 3 evenly pastes through cement mortar layer 2 and locates on wall 1, be equipped with many vertical settings and the water conservancy diversion hole 4 that link up from top to bottom in the finish coat to in forming the water conservancy diversion passageway that supplies the saltpetering thick liquid discharge in cement mortar layer 2, water conservancy diversion hole 4 is located the boundary position department of cement mortar layer and stone material, and many water conservancy diversion holes 4 set up along the length direction interval of finish coat.
The concrete construction steps of paving and pasting the stone are as follows: (1) pre-treatment, namely removing impurities on the surface of the stone 3, cleaning, and cleaning the wall surface 1 to be paved with the stone 3; (2) positioning the stay wires, arranging transverse lines and longitudinal lines on the wall surface 1 according to the size of the stone 3 to be pasted, wherein the area formed by each transverse line and each longitudinal line is used for paving and pasting the stone 3; (3) pre-smearing a plurality of vertical cement mortar strips on two sides of each vertical line on the wall surface respectively, and after the cement mortar strips are initially set; arranging a plurality of vertical guide rods on the cement mortar strips at intervals, enabling the guide rods to be attached to the cement mortar strips, fully coating a layer of release agent on the outer walls of the guide rods, enabling the lower end of each guide rod to be in contact with the bottom of the wall surface, and enabling the upper end of each guide rod to extend out of the top of the wall surface; (4) paving vertical face stones, paving a cement mortar layer 2 on a wall surface, paving a row of stones 3 at the bottom of the wall surface 1 along the length direction when paving the stones 3, preliminarily fixing the guide rods, then sequentially sticking the stones 3 to the wall surface from bottom to top, and contacting the back faces of the stones 3 with the corresponding guide rods; (5) forming a flow guide hole 4, taking out the flow guide rod after the cement mortar layer 2 is initially set, and forming a vertical flow guide hole 4 for discharging the saltpeter slurry between the stone 3 and the cement mortar layer 2; (6) and (4) capping, finally paving a layer of cement mortar on the top of the wall surface 1, and then tiling and jacking stone materials to finish top sealing of the wall surface.
This scheme mainly is applicable to the wet construction operation that pastes of facade view of stone material, improve in the structure of following stone material construction operation in this scheme, through arrange many water conservancy diversion poles in advance before cement mortar layer 2, then treat cement mortar layer 2 initial set back, take out the water conservancy diversion pole, it supplies the exhaust water conservancy diversion hole 4 of saltpetering thick liquid to have formed many between cement mortar layer 2 and stone material 3, the pass in water conservancy diversion hole 4 can be circular, also can be for rectangle or square etc. thereby avoided the saltpetering thick liquid to get into 3 inside saltpetering phenomena that take place of stone material through water conservancy diversion hole 4. Generally, the alkali-efflorescence protection of the stone is generally improved from the material, and various protective agents are coated on the back surface of the stone 3 to prevent the alkali-efflorescence phenomenon of the stone 3. And the diversion hole 4 that forms between cement mortar layer 2 and stone material 3 is utilized in this scheme, so the saltpetering thick liquid just can be discharged through this diversion hole 4. Because the density of wall 1 and stone material 3 is great relatively, the water conductivity is relatively poor, consequently under the prerequisite that water conservancy diversion hole 4 exists, the saltpetering thick liquid that produces in the cement mortar layer 2 is changeed naturally and is assembled to water conservancy diversion hole 4 department, then the saltpetering thick liquid under the action of gravity, from last to flowing down to the wall bottom and discharging to the saltpetering phenomenon has been avoided the saltpetering thick liquid to soak 3 inside appearances of stone material. And the top of the flow guide hole 4 can be ensured to be closed by the top pressing stone, so that the mortar layer is prevented from being corroded by external rainwater.
The first embodiment is as follows: as shown in fig. 2, the diversion holes 4 are located in the cement mortar layer 2 and near the back side of the stone 3.
Like this, when actual construction, through inserting the guide bar is pre-buried and establish in cement mortar layer 2, the guide bar forms this water conservancy diversion hole 4 after taking out, and this water conservancy diversion hole 4 is close to in 3 one sides of stone material in addition, and the saltpetering thick liquid in cement mortar layer 2 and the stone material 3 alright discharge with the guide hole 4 that directly passes through in the cement mortar layer 2, has reduced the saltpetering thick liquid and has immersed the inside probability of stone material 3.
Example two: as shown in fig. 3, the diversion holes 4 are partially located in the stone 3 and partially located in the cement mortar layer 2.
Like this, can set up the recess at the back of stone material 3 when specifically constructing, the part holding of water conservancy diversion pole is in the recess, water conservancy diversion pole partly protrusion outside the recess, 4 parts of water conservancy diversion hole that form like this are arranged in stone material 3, another part is arranged in cement mortar layer 2, thereby more do benefit to the saltpetering thick liquid between cement mortar layer 2 and stone material 3 and discharge from water conservancy diversion hole 4, the water conservancy diversion area of saltpetering thick liquid has been increased, the discharge capacity of saltpetering thick liquid is improved, greatly reduced 3 probabilities that take place the saltpetering phenomenon of stone material.
Example three: as shown in fig. 4, the diversion holes 4 are located in the stone 3 and near one side of the back surface of the stone 3.
Like this, when concrete construction, can open in stone material 3 and establish the storage tank, cooperate with the guide post in the storage tank at the 3 backs of stone material, avoid cement mortar to get into in the storage tank through the guide post, the back is taken out to the guide post, the storage tank has just formed guide hole 4, guide hole 4 is located the 3 backs of stone material like this, equally can play the drainage effect to the saltpetering thick liquid, mainly be applicable to and use under the thinner condition in mortar layer, but the saltpetering thick liquid in the cement mortar layer 2 is difficult for flowing out from guide hole 4 relatively.
In a specific embodiment, at least one flow guide hole is respectively arranged on the left side and the right side of the stone 3 in the length direction.
Like this, because the mortar joint position department between the adjacent stone material of left and right sides does not have the shielding of stone material, consequently this region is the weak region that the saltpetering thick liquid spills over, and most saltpetering thick liquid all easily overflows in this region, consequently sets up a water conservancy diversion hole respectively in stone material length direction's the left and right sides, and every vertical mortar joint position department all has two water conservancy diversion holes like this to can be with the saltpetering thick liquid in region abundant water conservancy diversion to the water conservancy diversion downthehole, discharge to the outside by the water conservancy diversion hole. When the length of the stone is more than 600mm, a diversion hole can be arranged at the middle position of the stone in the length direction to ensure the diversion capability of the saltpetering slurry. The distance between adjacent diversion holes is not more than 600 mm.
In a specific embodiment, the top of the wall surface 1 is covered with a top-pressing stone 3, the top of the wall surface is covered with the top-pressing stone 3, and the top of the flow guide hole 4 is sealed.
Like this, the top that pushes up stone material 3 can guarantee that water conservancy diversion hole 4 is sealed, avoids external rainwater to corrode cement mortar layer 2.
In the specific implementation process, the bottom of the wall surface is provided with guide grooves arranged along the length direction of the wall surface, the cross section of each guide groove is U-shaped, and the lower end of each guide hole is communicated with the guide groove; the diversion trench is arranged with a certain gradient.
Like this, can drain the saltpetering thick liquid in the water conservancy diversion hole through the guiding gutter to avoid appearing the saltpetering thick liquid on the ground of wall bottom.
In the specific implementation process, the guide rod is made of smooth round steel bars.
Like this, the cross-section of plain round reinforcing bar is circular, is convenient for take out, and the reinforcing bar is drawn materials conveniently moreover, can realize reuse, specifically can select for use the phi 6 reinforcing bar.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a stone material whiskering water conservancy diversion structure, includes the wall and is located the finish coat outside the wall, the finish coat includes cement mortar layer and stone material, the stone material passes through the even subsides of cement mortar layer and locates on the wall its characterized in that: the decorative surface layer is internally provided with a plurality of vertically arranged and vertically communicated diversion holes so as to form a diversion channel for discharging saltpetering slurry in a cement mortar layer, the diversion holes are positioned at the junction position of the cement mortar layer and the stone, and the diversion holes are arranged at intervals along the length direction of the decorative surface layer.
2. The saltpetering diversion structure for stone according to claim 1, wherein: the diversion hole is positioned in the cement mortar layer and close to one side of the back of the stone.
3. The saltpetering diversion structure for stone according to claim 1, wherein: one part of the diversion hole is positioned in the stone, and the other part of the diversion hole is positioned in the cement mortar layer.
4. The saltpetering diversion structure for stone according to claim 1, wherein: the diversion hole is positioned in the stone and close to one side of the back of the stone.
5. The saltpetering diversion structure for stone according to any one of claims 2 to 4, wherein: the left side and the right side of the stone in the length direction are at least respectively provided with a flow guide hole.
6. The saltpetering diversion structure for stone according to claim 1, wherein: the wall top still covers and is equipped with the stone material of bearing down, the top of wall is located to the stone material lid of bearing down, and seals the top in water conservancy diversion hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023074693.9U CN214006348U (en) | 2020-12-18 | 2020-12-18 | Stone material whiskering water conservancy diversion structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023074693.9U CN214006348U (en) | 2020-12-18 | 2020-12-18 | Stone material whiskering water conservancy diversion structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214006348U true CN214006348U (en) | 2021-08-20 |
Family
ID=77312399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023074693.9U Active CN214006348U (en) | 2020-12-18 | 2020-12-18 | Stone material whiskering water conservancy diversion structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214006348U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359988A (en) * | 2020-12-18 | 2021-02-12 | 重庆渝高科技产业(集团)股份有限公司 | Construction method of stone whiskering diversion structure |
| CN114412104A (en) * | 2022-01-27 | 2022-04-29 | 广州市绿化有限公司 | Construction method for stone paving alkali return control flow guiding net |
-
2020
- 2020-12-18 CN CN202023074693.9U patent/CN214006348U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359988A (en) * | 2020-12-18 | 2021-02-12 | 重庆渝高科技产业(集团)股份有限公司 | Construction method of stone whiskering diversion structure |
| CN114412104A (en) * | 2022-01-27 | 2022-04-29 | 广州市绿化有限公司 | Construction method for stone paving alkali return control flow guiding net |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214006348U (en) | Stone material whiskering water conservancy diversion structure | |
| CN106906962B (en) | A kind of building roof parapet flashing construction technology | |
| CN112431213B (en) | Ecological comprehensive treatment structure for semi-rigid support of artificial slope and construction method thereof | |
| CN108124645A (en) | A kind of precast combined anti-collision wall with water storage greening function | |
| CN205857551U (en) | A kind of Jing Qiang anti-stone material common fault structure of orientation water drainage of bearing down on one | |
| CN203925527U (en) | A kind of construction joint of tunnel percolating water punishment system | |
| CN210151748U (en) | Foundation pit water collection surface drainage dewatering system | |
| CN211286064U (en) | Waterproof construction structure of kitchen guarding ground | |
| CN112359988B (en) | Construction method of stone whiskering diversion structure | |
| CN207145004U (en) | A kind of constructing structure of tunnel arch wall pin anti-seep water | |
| CN209874098U (en) | Building wall waterproof structure with externally hung stairs | |
| CN212670599U (en) | Geotechnical engineering slope seepage prevention water structure | |
| CN111535512B (en) | Planting building structure | |
| CN211523106U (en) | Ecological wall of hydraulic engineering | |
| CN209066442U (en) | A kind of inverse construction joint structure for building construction of deep basal pit | |
| CN210151514U (en) | Drainage floor tile | |
| CN207244678U (en) | A kind of house aproll structure | |
| CN207469267U (en) | One kind prevents erosion system | |
| CN206189214U (en) | Drainage ceramic tile frame construction | |
| CN214272680U (en) | Roof waterproof structure | |
| CN219909653U (en) | Parapet waterproof coiled material closing-in structure | |
| CN212026266U (en) | Row pile foundation pit supporting structure | |
| CN218060936U (en) | Heat preservation structure of outer facade of fair-faced concrete | |
| CN217710887U (en) | Foundation waterproof construction is built in room | |
| CN220978118U (en) | Novel post-pouring belt waterproof structure of ground warehouse roof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |