CN108797599A - Miniature steel pipe pile prestressed anchor rope combination supporting system - Google Patents
Miniature steel pipe pile prestressed anchor rope combination supporting system Download PDFInfo
- Publication number
- CN108797599A CN108797599A CN201810488641.4A CN201810488641A CN108797599A CN 108797599 A CN108797599 A CN 108797599A CN 201810488641 A CN201810488641 A CN 201810488641A CN 108797599 A CN108797599 A CN 108797599A
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- CN
- China
- Prior art keywords
- steel pipe
- connecting structure
- waist rail
- pipe pile
- supporting system
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
Abstract
The present invention relates to construction site Base hole supporting technology fields,Especially a kind of miniature steel pipe pile prestressed anchor rope combination supporting system,Including Guan Liang,It is equipped at intervals with more tube bodies along slope surface length direction,It is transversely provided with multiple lateral waist rail connecting structure along slope surface short transverse,Multiple longitudinal waist rail connecting structure are longitudinally equipped with along slope surface length direction,Lateral waist rail connecting structure forms the first netted protection body with longitudinal waist rail connecting structure,The second netted protection body is equipped with below the first netted protection body,First,Two netted protection bodies are equipped with fixed part,First,Protection network is equipped between two netted protection bodies and tube body,In protection network and first,Two netted protection bodies are equipped with concrete shield,Concrete shield is equipped with multiple sluicing portions,The present invention is easy for construction,Foundation pit sideline is easy to control,By applying Prestressing to anchor pole rope,Effective control slope deforming,Reliability is high,It is with obvious effects,With preferable popularizing value.
Description
Technical field
The present invention relates to construction site Base hole supporting technology field, especially a kind of miniature steel pipe pile prestressed anchor rope group
Close support system.
Background technology
With the development of urban construction, a large amount of high level is emerged around existing building, often construction site is narrow
And proximate building, Slope Stability is affected and proposed place surrounding enviroment are complicated excavating, away from existing structure compared with
Closely, pipeline is more, and when the deep foundation pit support stringent to deformation requirements, traditional slope excavation cannot be satisfied deep foundation pit support
It is required that there are many deficiencies, such as vertical cut local instability, backbreak, explosion, the formation such as catalase and unfavorable structural plane
The danger of adverse slope, supporting and excavation construction difficulty are big, and foundation pit sideline is not easy to control, are unfavorable for shoveling and bursting work, globality
It is poor, and cannot effectively control slope deforming, how under the execution conditions in no slope space, it is ensured that the excavation of deep basal pit and
And the safety of Adjacent Buildings, it has also become the technical barrier in foundation pit support construction.
Invention content
The purpose of the present invention is being directed to many deficiencies existing for traditional pattern foundation pit supporting structure at present, a kind of miniature steel pipe pile is provided
Prestressed anchor rope combination supporting system can be solved effectively at no slope space, the support issues of deep basal pit, ensure deep basal pit
And the safety of surrounding building.
In view of the deficienciess of the prior art, miniature steel pipe pile prestressed anchor rope combination supporting system of the present invention will solve
The technical issues of adopted the technical scheme that:Miniature steel pipe pile prestressed anchor rope combination supporting system, including be set to and apply
The Guan Liang being made of concrete layer and reinforcing bar at the top of work slope surface is equipped at intervals with more both ends along slope surface length direction and is separately connected
In the tube body of Guan Liang and bottom of foundation ditch, multiple lateral waist rail connecting structure are transversely provided with along slope surface short transverse, along slope surface length
Direction is longitudinally equipped with multiple longitudinal waist rail connecting structure being connect with lateral waist rail connecting structure, the transverse direction waist rail connecting structure
The the first netted protection body for preventing slope surface from caving in for covering slope surface is formed with longitudinal waist rail connecting structure, in the first netted protection
The second netted protection body is equipped with below body, the second netted protection body includes more and is connected with longeron, along longeron direction
The vertical muscle and the more horizontal bars being connected with vertical muscle for extending to bottom of foundation ditch, in the handing-over of horizontal bar and vertical muscle
Place, and the junction of longitudinal waist rail connecting structure and lateral waist rail connecting structure are equipped with fixed part, in the first netted protection
Protection network is equipped between body, the second netted protection body and tube body, in protection network and the first netted protection body, the second netted protection body
It is equipped with concrete shield, the concrete shield is equipped with multiple sluicing portions.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the fixed part include multiple hole positions, and
The anchor pole rope being set in the position of hole.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the transverse direction waist rail connecting structure includes along hole
What the reinforcing bar for tying up fasciculation by more that position is laterally arranged and the concrete layer for wrapping up reinforcing bar being set on reinforcing bar formed
Crossbeam, the crossbeam bottom width are more than cross rail top width, and one is equipped between crossbeam bottom and cross rail top and is used for two
The inclined surface of person's connection, the hole position are opened on inclined surface.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the longitudinal direction waist rail connecting structure includes along hole
What the longitudinally disposed reinforcing bar for tying up fasciculation by more in position and the concrete layer for wrapping up reinforcing bar being set on reinforcing bar formed
Longeron, the longeron cross section are square.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the vertical muscle are reinforcing bar with horizontal bar.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the protection network are by transverse direction and longitudinal direction reinforcing bar
The bar-mat reinforcement of composition, the bar-mat reinforcement are single layer, and the soil nailing for connecting bar-mat reinforcement is equipped in top of the slope.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the tube body are diameter 108mm, wall thickness 5mm
Steel pipe.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the anchor pole rope free segment are polyethylene jacket
Pipe, anchor cable body of rod centering holder are plastic stent, and a secondary grouting pipe is equipped in the middle part of anchor cable bar.
Above-mentioned miniature steel pipe pile prestressed anchor rope combination supporting system, the sluicing portion are 2m* including spacing in length and breadth
2m, the drain hole of slope 5%, and the tapping pipe that is set in drain hole, the tapping pipe water inlet are connected with hole position, water outlet
Mouth is connected with drain hole, and drain hole inlet side is equipped with cobble heap capsule drainage layer, filter screen is equipped in tapping pipe, at foundation pit bottom
Portion is equipped with catchment.
The advantageous effect of miniature steel pipe pile prestressed anchor rope combination supporting system of the present invention is, by construction slope surface top
The Guan Liang being made of concrete layer and reinforcing bar is arranged in portion, is equipped at intervals with more both ends along slope surface length direction and is connected to Guan Liang
And the tube body of bottom of foundation ditch, it effectively avoids backbreaking, explosion, catalase and unfavorable structural plane etc. form the danger of adverse slope, opposite side
Slope is stablized favorably, is transversely provided with multiple lateral waist rail connecting structure along slope surface short transverse, is longitudinally equipped with along slope surface length direction
Multiple longitudinal waist rail connecting structure being connect with lateral waist rail connecting structure, lateral waist rail connecting structure connect structure with longitudinal waist rail
Appearance is equipped with the second net at the first netted protection body for preventing slope surface from caving in for covering slope surface below the first netted protection body
Shape protection body, the second netted protection body include more and are connected with longeron, and the vertical of bottom of foundation ditch is extended to along longeron direction
Muscle and the more horizontal bars being connected with vertical muscle connect structure in the junction of horizontal bar and vertical muscle, and longitudinal waist rail
It makes and is equipped with fixed part with the junction of lateral waist rail connecting structure, in the first netted protection body, the second netted protection body and pipe
It is equipped with protection network between body, concrete shield is equipped on protection network and the first netted protection body, the second netted protection body, it is whole
Body is well stablized, and concrete shield is equipped with multiple sluicing portions, and convenient for draining, the present invention is easy for construction, and foundation pit sideline holds
It is easy to control, by applying Prestressing to anchor pole rope, slope deforming is effectively controlled, reliability is high, with obvious effects, has preferable
Popularizing value.
Description of the drawings
Fig. 1 is the front view of the present invention；
Fig. 2 is the left view of the present invention；
Fig. 3 is the sectional view of the second netted protection body；
Fig. 4 is the structural schematic diagram that anchor pole rope is connect with crossbeam.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment is described in further details the present invention.
As shown in Figure 1,2,3, 4, miniature steel pipe pile prestressed anchor rope combination supporting system, including it is set to construction slope surface
The Guan Liang 1 being made of concrete layer and reinforcing bar at top is equipped at intervals with more both ends along slope surface length direction and is connected to hat
Beam 1 and the tube body of bottom of foundation ditch 2, the tube body 2 are diameter 108mm, and the steel pipe of wall thickness 5mm, steel-pipe pile drilling is using mesohigh
Bore process, spacing 1.0m；After steel pipe is put into, it is inserted into Grouting Pipe in steel duct, Grouting Pipe is inserted into bottom hole, then retreat 300 ~
500mm starts slip casting, and 0.5 neat slurry of the ratio of mud is perfused, is returned out by steel pipe bottom extravasating hole, slurries continuously fill from bottom to top
Note, until being filled in entire steel pipe and stake holes.Grouting Pipe is at the uniform velocity extracted with the injection of cement mortar, if aperture without excessive slurry,
Slurry is mended in time.After cement mortar injection, in addition to the infiltration of the also oriented rock-soil layer of the solidification shrinkage of itself, aperture slurries is caused to bounce back,
Back-grouting technique should be used, benefit slurry one arrives secondary in time, ensures that aperture slip casting is full, enters Guan Liang 0.3m at the top of steel-pipe pile.Steel
The main reinforcement of pile pile and Guan Liang after the completion of reinforcing bar binding, formwork erection, pours C20 concretes using being welded to connect.
Multiple lateral waist rail connecting structure are transversely provided with along slope surface short transverse, the transverse direction waist rail connecting structure includes edge
The reinforcing bar for tying up fasciculation by more that hole position is laterally arranged and the concrete layer for wrapping up reinforcing bar being set on reinforcing bar form
Crossbeam 3,3 bottom width of the crossbeam be more than cross rail top width, be used for equipped with one between crossbeam bottom and cross rail top
The inclined surface 4 that the two is connected longitudinally is equipped with multiple longitudinal waists being connect with lateral waist rail connecting structure along slope surface length direction
Beam connecting structure, the longitudinal direction waist rail connecting structure include along the longitudinally disposed reinforcing bar for tying up fasciculation by more in hole position and setting
It is placed in the longeron 5 of the concrete layer composition for wrapping up reinforcing bar on reinforcing bar, the longeron cross section is square, the transverse waist
Beam connecting structure forms the first netted protection body for preventing slope surface from caving in for covering slope surface with longitudinal waist rail connecting structure, the
It is equipped with the second netted protection body below one netted protection body, the second netted protection body includes more and is connected with longeron,
The vertical muscle 6 of bottom of foundation ditch is extended to along longeron direction and horizontal bar 7 that more are connected with vertical muscle 6, the vertical muscle
6 with horizontal bar 7 be reinforcing bar, and in the junction of horizontal bar and vertical muscle, and longitudinal waist rail connecting structure is connect with transverse direction waist rail
The junction of construction is equipped with fixed part, and the fixed part includes multiple hole positions, and the anchor pole rope 8 being set in the position of hole, hole
Position is opened on inclined surface, and the anchor pole rope free segment is polyethylene cannula, so that the body of rod is isolated with cement mortar, it is ensured that the body of rod section
Free Transform, prestressed anchor bar material use 15.2 underrelaxation high strength steel strands of Φ, normal intensity 1860MPa, the anchor cable body of rod
Centering holder is plastic stent, is equipped with a secondary grouting pipe in the middle part of anchor cable bar, and hole is determined according to design requirement before armature boring
Position, hole position vertical direction tolerance is ± 50mm, and horizontal direction tolerance is ± 30mm, and drill hole inclination tolerance is
3%, bore diameter 130mm.Armature boring takes casing follow-up mode, and anchor pole rope should be put into hole immediately after pore-forming, bored
Hole should be more than Soil Anchor Design length 0.5m, and the standoff body of rod of the band performed is placed into hole together together with once grouting pipe,
Grouting Pipe is first inserted into bottom hole, then retreats 300 ~ 500mm, starts slip casting, slurries continuous pouring from bottom to top, and ensure out of hole
Smoothly draining, gas.Grouting Pipe is at the uniform velocity extracted with the injection of cement mortar, if slurry is mended in aperture in time without excessive slurry.Prestressed anchor Suo Yan
Lattice press design length blanking, allowable error 50mm, and exposed tensioning length is determined according to tensioning equipment.
Protection network 9 is equipped between the first netted protection body, the second netted protection body and tube body, the protection network is by cross
To and the bar-mat reinforcement that forms of longitudinal reinforcement, the bar-mat reinforcement is single layer, and paving is hung 6.5@200mm single-layer bidirectionals of steel grid φ, used
Longitudinal waist rail connecting structure is fixed on lateral waist rail connecting structure in slope surface, the lap of splice at least 300mm between mesh sheet.Injection
Concrete, concrete strength C20, thickness 80mm.Spray concrete ratio, cement：Middle sand：Graded broken stone（Grain size is not more than 15mm）=1：2：2,
After the earth excavation of stake face, linked network simultaneously carries out concrete spray concrete, and spray concrete thickness is not less than 80mm, is equipped in top of the slope for connecting
The soil nailing of bar-mat reinforcement, bar-mat reinforcement top are arranged reinforcing rib and are connected with soil nailing binding.Soil nailing uses the screw-thread steel of HRB400 diameters 25, long
Degree and level interval are 1.5 meters.It is positioned manually and is driven into, ensure its length before constructing and be driven into angle and meet design requirement.
Concrete shield 12, the coagulation are equipped on protection network and the first netted protection body, the second netted protection body
Native protective layer be equipped with multiple sluicing portions, the sluicing portion include in length and breadth spacing be 2m*2m, the drain hole 10 of slope 5%, and
The tapping pipe being set in drain hole, material are that the pvc of caliber 50 is managed, total length 400mm, protruded length 100mm, the sluicing
Water inlet tube mouth is connected with hole position, and water outlet is connected with drain hole, and 10 inlet side of drain hole is equipped with cobble heap capsule drainage layer,（Tightly
Do not make drainage layer when pasting rock stratum）, using dank material, filter screen is equipped in tapping pipe, iron wire tightens, after being placed in tapping pipe
Concrete on the outside of pipe is uniformly smeared into reality, is left no gaps, catchment 11 is equipped in bottom of foundation ditch.
In the construction process, it is noted that the deviation proportion of miniature steel pipe pile drilling axis is no more than steel pipe pile length
1%.Hole depth is not less than Design of Steel-tube Piles length, but is not also preferably greater than the 200mm of design length.
Miniature steel pipe pile drills to projected depth, should stagnate 1 ~ 2min, and blow into hole, and rock powder in hole is dried up
Only.Drilling blocks aperture before finishing slip casting, prevents in sundries and soil bits access aperture, bottom hole sediment is not more than 200mm.
After miniature slip casting, before slurry solidifies completely, forbids to collide, rocks steel pipe.
Bolthole finishes in drilling and blocks aperture using cement package bags before slip casting, prevents sundries and soil bits access aperture
It is interior.
Grouting P.O42.5 cement, by 0.50 ratio of mud mixing.Cement mortar should stir evenly, with mixing with once mixing
The cement mortar of sum should be finished before initial set, and prevent that stone, sundries are mixed into.
Slope surface is cleared up：Earthwork evacuation finishes and behind thick pingbian slope, should use manual amendment slope surface, exclude surface dust or danger
Stone reduces the rebound degree of concrete, the purpose of the smooth beauty of face layer to reach the bond strength of enhancing concrete face layer and side slope.
Start suitably reduce jet length when injection, concrete is made to squeeze into bar-mat reinforcement behind, ensures that bar-mat reinforcement is wrapped completely by concrete
It wraps up in, when spray skin layer concrete, then suitably widens jet length to 0.6 ~ 1.2 meter, keep concrete jetting thickness uniform, surfacing.
Surface thickness is detected with bar dowel immediately after injection, as thickness is unsatisfactory for requiring spraying one time again again.
Free section can uniformly smear one layer of butter or housing plastic bellows hose, and fasten.
The tensioning of anchor pole should anchoring body intensity and waist rail concrete strength reach design strength 80% after can be into
Row, and by design prestressing force lock value locking.Before body of rod processing, strength test sampling observation is carried out to material, ensures the tension of the body of rod
Power.
Bolt cement uses P.O42.5 cement, the ratio of mud 0.40~0.5, bolt grouting to use secondary grouting technique.
In construction, process record is performed per procedure, it is stringent to check and accept, not by inspection, next process must not be entered.Anchor
Bar construction size and tolerance see the table below
All construction personnel are before being on duty, it is necessary to carry out post education, learn act of technique for security and rules and regulations, safety is anti-
Protect performance and the application of facility, personal protective equipment use and keeping etc., can be on duty operation after examination is qualified.
Twice flak jacket railing is set with Ф 48mm steel pipes around away from foundation pit side 0.6m, upright bar spacing 2m is higher by naturally
Level ground 1.2m, buried depth 0.8m.
Forbid mound, windrow within the scope of foundation pit upper brim 1m and parks equipment.It mustn't within the scope of bolt-spary supports 5m suitable for reading
Loaded vehicle stops.
In Excavation Process, bucket is forbidden to collide supporting construction（Waist rail, anchor pole rope, concrete mask etc.）, excavate tight in place
Taboo is backbreak.
Warning sign is set during foundation pit construction, night adds red colored lamp mark.
Adopt an effective measure control construction in airborne dust, bagged cement must cover, must not random air storage, Yi Mianyu
Leaching.
Personnel into site operation must put on work clothes, safe wearing cap, gloves, goggles, etc. labour protections use
Product.
When opening work position, it is necessary to which closing electrical switching is simultaneously cut off the power.When using electric tool, unsuitable band gloves.
Certainly, above description is not the limitation to invention, and the present invention is also not limited to the example above, the art
Those of ordinary skill the present invention variations, modifications, additions or substitutions, should also belong to the scope of protection of the present invention.
Claims (9)
1. miniature steel pipe pile prestressed anchor rope combination supporting system, including be set at the top of construction slope surface by concrete layer and
The Guan Liang of reinforcing bar composition, which is characterized in that be equipped at intervals with more both ends along slope surface length direction and be connected to Guan Liang and foundation pit
The tube body of bottom is transversely provided with multiple lateral waist rail connecting structure along slope surface short transverse, is longitudinally equipped with along slope surface length direction
Multiple longitudinal waist rail connecting structure being connect with lateral waist rail connecting structure, the transverse direction waist rail connecting structure connect with longitudinal waist rail
It connects construction and forms the first netted protection body for preventing slope surface from caving in for covering slope surface, the is equipped with below the first netted protection body
Two netted protection bodies, the second netted protection body include more and are connected with longeron, and foundation pit bottom is extended to along longeron direction
The vertical muscle in portion and the more horizontal bars being connected with vertical muscle, in the junction of horizontal bar and vertical muscle, and longitudinal waist
Beam connecting structure and the junction of lateral waist rail connecting structure are equipped with fixed part, in the first netted protection body, second netted anti-
It is equipped with protection network between watch box and tube body, concrete is equipped on protection network and the first netted protection body, the second netted protection body
Protective layer, the concrete shield are equipped with multiple sluicing portions.
2. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 1, characterized in that the fixation
Portion includes multiple hole positions, and the anchor pole rope being set in the position of hole.
3. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 2, characterized in that the transverse direction
Waist rail connecting structure include along the hole reinforcing bar for tying up fasciculation by more that is laterally arranged of position and be set on reinforcing bar by reinforcing bar
The crossbeam of the concrete layer composition of package, the crossbeam bottom width is more than cross rail top width, in crossbeam bottom and crossbeam top
An inclined surface for connecting the two is equipped between portion, the hole position is opened on inclined surface.
4. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 2, characterized in that the longitudinal direction
Waist rail connecting structure include along the hole longitudinally disposed reinforcing bar for tying up fasciculation by more in position and be set on reinforcing bar by reinforcing bar
The longeron of the concrete layer composition of package, the longeron cross section is square.
5. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 1, characterized in that described vertical
Muscle is reinforcing bar with horizontal bar.
6. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 1, characterized in that the protection
Net is the bar-mat reinforcement being made of transverse direction and longitudinal direction reinforcing bar, and the bar-mat reinforcement is single layer, is equipped in top of the slope for connecting bar-mat reinforcement
Soil nailing.
7. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 1, characterized in that the tube body
For diameter 108mm, the steel pipe of wall thickness 5mm.
8. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 2, characterized in that the anchor pole
Rope free segment is polyethylene cannula, and anchor cable body of rod centering holder is plastic stent, and a secondary grouting pipe is equipped in the middle part of anchor cable bar.
9. miniature steel pipe pile prestressed anchor rope combination supporting system according to claim 1, characterized in that the sluicing
Portion include in length and breadth spacing be 2m*2m, the drain hole of slope 5%, and the tapping pipe that is set in drain hole, the tapping pipe into
The mouth of a river is connected with hole position, and water outlet is connected with drain hole, and drain hole inlet side is equipped with cobble heap capsule drainage layer, in tapping pipe
Equipped with filter screen, catchment is equipped in bottom of foundation ditch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810488641.4A CN108797599A (en) | 2018-05-21 | 2018-05-21 | Miniature steel pipe pile prestressed anchor rope combination supporting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810488641.4A CN108797599A (en) | 2018-05-21 | 2018-05-21 | Miniature steel pipe pile prestressed anchor rope combination supporting system |
Publications (1)
| Publication Number | Publication Date |
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| CN108797599A true CN108797599A (en) | 2018-11-13 |
Family
ID=64091365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810488641.4A Pending CN108797599A (en) | 2018-05-21 | 2018-05-21 | Miniature steel pipe pile prestressed anchor rope combination supporting system |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495081A (en) * | 2020-11-13 | 2021-03-16 | 郑州大学第一附属医院 | Dustproof effectual building foundation ditch dustproof system |
| CN114182738A (en) * | 2021-12-29 | 2022-03-15 | 中铁十二局集团建筑安装工程有限公司 | Excavation and support construction method for foundation pit in limited space |
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| CN208415267U (en) * | 2018-05-21 | 2019-01-22 | 青岛一建集团有限公司 | Miniature steel pipe pile prestressed anchor rope combination supporting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112495081A (en) * | 2020-11-13 | 2021-03-16 | 郑州大学第一附属医院 | Dustproof effectual building foundation ditch dustproof system |
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| CN114182738A (en) * | 2021-12-29 | 2022-03-15 | 中铁十二局集团建筑安装工程有限公司 | Excavation and support construction method for foundation pit in limited space |
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