CN111395312A - Composite light pile structure, manufacturing method, construction method and pile splicing method - Google Patents
Composite light pile structure, manufacturing method, construction method and pile splicing method Download PDFInfo
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- CN111395312A CN111395312A CN202010209780.6A CN202010209780A CN111395312A CN 111395312 A CN111395312 A CN 111395312A CN 202010209780 A CN202010209780 A CN 202010209780A CN 111395312 A CN111395312 A CN 111395312A
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- 239000002131 composite material Substances 0.000 title claims abstract description 128
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 230000002787 reinforcement Effects 0.000 claims abstract description 34
- 239000002689 soil Substances 0.000 claims abstract description 30
- 230000001681 protective effect Effects 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000005553 drilling Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 239000011083 cement mortar Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
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- 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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/82—Moulds built-up from several parts; Multiple moulds; Moulds with adjustable parts
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- 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
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
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Abstract
The invention discloses a composite light pile structure, a manufacturing method, a construction method and a pile extension method, wherein the composite light pile structure comprises light soil and a composite reinforcement cage, the composite reinforcement cage comprises vertical geogrids arranged at intervals along the circumferential direction and annular geogrids arranged at intervals along the vertical direction, the light soil is low in density and high in compression resistance, the composite reinforcement cage plays a role of a stirrup under the action of a pile top load by utilizing the tensile resistance of the geogrids, a pile body has higher compression resistance, pile crushing or pile breaking is avoided, meanwhile, the composite reinforcement cage can prevent the composite light pile from cracking, the structure can reduce the in-situ effective stress of a foundation by replacing the rock soil of the foundation, can be used for balancing an overlying load, achieves the purpose of reducing the additional stress of the overlying load in the foundation, has high compressive strength, can reinforce the foundation and improves the bearing capacity of the foundation, and can transmit the overlying load to a lower lying stratum better through the rock soil structure, the additional stress increase of the existing building is avoided, and the purpose of controlling the deformation of the foundation is realized.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a composite light pile structure, a manufacturing method, a construction method and a pile splicing method.
Background
In recent years, as the construction of engineering and construction has been rapidly developed, the relationship between a new building and an existing building or structure includes close proximity, overpass, underpass, and the like. Under the additional load action of a newly built (constructed) building, diseases such as uneven settlement, inclination instability, crushing and fracturing can be generated on the existing building or structure, and even serious safety accidents are caused. In order to meet the bearing requirement of the foundation, the foundation of a newly built (constructed) building is usually reinforced by a large number of pile foundations, the pile foundations replace original rock soil, and the weight of most of the pile foundations is greater than that of the original rock soil, namely, the pile foundations are arranged to increase additional load of the foundation to a certain extent, the additional load can be transmitted to the foundation of the existing building or the structure through the contact force transmission effect of the rock soil, and the load of the newly built (constructed) building is added, so that the additional stress of the existing building or the structure is increased, the foundation of the existing building or the structure also deforms correspondingly, and the foundation of the existing building or the structure can be inclined and unstable, and the normal use function of the existing building or the structure is influenced. On the other hand, if the construction time of the pile foundation of the new building is too long, the normal use function of the existing building or structure can be influenced, the engineering risk is increased, and therefore the new building or structure should adopt a prefabricated structure as far as possible.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the composite light-weight pile structure, the manufacturing method, the construction method and the pile splicing method are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
the composite light pile structure comprises light soil and a composite reinforcement cage, wherein the composite reinforcement cage is embedded in the light soil;
the composite reinforcement cage comprises vertical geogrids and annular geogrids, wherein the vertical geogrids are arranged at intervals along the circumferential direction, the annular geogrids are arranged at intervals along the vertical direction, the vertical geogrids and the annular geogrids are connected into a whole in an intersecting mode, and quadrilateral meshes are formed between every two adjacent vertical geogrids and every two adjacent annular geogrids.
Through the structure, the light soil material has light weight, low density and good compression resistance, can be constructed and poured in a narrow space, has better durability compared with other types of light materials, has no pollution to the environment, has superior environmental protection characteristic, can obviously reduce the stress of a substrate and control the post-construction settlement; the composite reinforcement cage utilizes the tensile capacity of the geogrid, the annular geogrid plays a role of a stirrup under the action of pile top load, a pile body can provide higher compressive capacity, pile bursting or pile breaking is avoided, meanwhile, the composite reinforcement cage plays a role of a reinforcement body, composite light piles can be prevented from cracking, and pile-forming light soil is combined with the composite reinforcement cage, so that a composite light pile structure is obtained. The structure reduces the in-situ effective stress of the foundation by replacing the foundation rock soil, can be used for balancing the overlying load and achieves the purpose of reducing the additional stress of the overlying load in the foundation; secondly, the structure has high compressive strength, can effectively reinforce the foundation, obviously improves the bearing capacity of the foundation, can transmit the overlying load to a rock-soil stratum with better lying down through the structure, avoids the additional stress increase of the existing building or the structure, realizes the purpose of controlling the deformation of the existing building or the structure foundation, and simultaneously can shorten the construction time and reduce the engineering risk.
The manufacturing method of the composite light pile is used for manufacturing the composite light pile structure, and the manufacturing tool comprises the following steps:
s1: erecting protective pipes in sections from bottom to top;
s2: sending the composite reinforcement cage into a protective pipe;
s3, injecting light soil into the protective pipe until the protective pipe is filled with the light soil;
and S4, dismantling the protective pipe in sections.
The manufacturing method ensures effective realization of the structural function of the composite light pile, and has clear flow, simple and convenient operation and environmental protection.
As a preferred scheme of the invention, the protective pipe is semi-open, a support and an annular hoop are arranged on the protective pipe, the annular hoop is locked at the erection position of each section of protective pipe, and the support is erected outside each section of protective pipe. Through the structure, the support provides supporting force, and the annular hoop locks two adjacent protective tubes together.
The term "semi-open" refers to: the protective pipe is formed by circumferentially splicing two pipe pieces with the sum of radians of 360 degrees.
As a preferable scheme of the present invention, in step S2, a weight is provided at a lower portion of the composite reinforcement cage. Through above-mentioned mechanism, the weight can increase the compound straightness accuracy that hangs down that adds the muscle cage, ensures the compound vertical straightness that hangs down that adds the muscle cage.
As a preferable scheme of the present invention, in step S2, the upper end of the composite reinforcement cage is sleeved on the outer wall of the outlet end of the pumping pipe and locked by the annular lock catch.
The construction method of the composite light pile is used for constructing the composite light pile structure and comprises the following steps:
a1, forming a foundation drill hole;
a2, placing the composite light pile into the foundation borehole, and connecting the upper and lower sections of composite light pile by adopting pile extension;
specifically, the pile splicing method adopted by the composite light piles at the upper end and the lower end comprises the following steps:
b1: arranging corresponding hole sites at the pile top of the lower composite light pile and the pile bottom of the upper composite light pile, and drilling;
b2: after the lower composite light pile is placed into a foundation for drilling, connecting reinforcing steel bars are implanted into pile top hole positions and grouting is carried out;
b3: the hole position at the bottom of the upper composite light pile is aligned to the pile top connecting steel bar of the lower composite light pile;
b4: the connection part of the upper and the lower composite light piles is fixedly connected by adopting an annular plate in a wrapping way, and the composite light piles are continuously arranged in the foundation drill holes;
a3, pouring cement mortar along the pile side of the composite lightweight pile until the pile top.
The construction method realizes the industrial prefabrication, the assembly operation and the mechanical construction, and the pile splicing method is used for connecting the composite light pile structure, ensures the effective realization of the functions of the composite light pile and is simple and convenient to operate.
As a preferable aspect of the present invention, in step B1, the hole depth is drilled to be not less than 1.0m and the hole diameter is not less than the diameter of the connecting bar implanted in step B2. Through the structure, the anchoring connection between the upper composite light pile and the lower composite light pile is ensured.
In a preferred embodiment of the present invention, in step B4, during the insertion of the composite lightweight pile, the hoisting ropes are bound to the lower composite lightweight pile, and the hoisting ropes bound to the lower composite lightweight pile are not released. Through above-mentioned structure, compound light pile gravity passes through hawser transmission to loop wheel machine down, avoids compound light pile to go up the prefabrication down and draws the effect of dragging to influence pile extension connection effect.
As a preferred embodiment of the present invention, in the steps B1 and B3, the hole sites are quincunx hole sites.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the light soil material has light weight, low density and good compression resistance, can be constructed and poured in a narrow space, has better durability, no pollution to the environment and excellent environmental protection property compared with other types of light materials, can obviously reduce the stress of a substrate and control the post-construction settlement; the composite reinforcement cage utilizes the tensile capacity of the geogrid, the annular geogrid plays a role of a stirrup under the action of pile top load, a pile body can provide higher compressive capacity, pile bursting or pile breaking is avoided, meanwhile, the composite reinforcement cage plays a role of a reinforcement body, composite light piles can be prevented from cracking, and pile-forming light soil is combined with the composite reinforcement cage, so that a composite light pile structure is obtained. The structure reduces the in-situ effective stress of the foundation by replacing the foundation rock soil, can be used for balancing the overlying load and achieves the purpose of reducing the additional stress of the overlying load in the foundation; secondly, the structure has high compressive strength, can effectively reinforce the foundation, obviously improves the bearing capacity of the foundation, can transmit the overlying load to a rock-soil stratum with better lying down through the structure, avoids the additional stress increase of the existing building or the structure, realizes the purpose of controlling the deformation of the existing building or the structure foundation, and simultaneously can shorten the construction time and reduce the engineering risk.
Drawings
Fig. 1 is a schematic view of a composite lightweight pile construction according to the present invention.
Fig. 2 is a schematic cross-sectional view of an erected steel protection pipe in the manufacturing of the composite lightweight pile.
Fig. 3 is a schematic plan view of the steel protective pipe erected in the process of manufacturing the composite lightweight pile.
Fig. 4 is a schematic view of the connection mode of the composite reinforcement cage and the outlet of the pumping pipe in the manufacturing process of the composite light-weight pile.
Fig. 5 is a schematic diagram of arrangement of quincunx hole sites in the composite lightweight pile.
Fig. 6 is a schematic cross-sectional view of a composite lightweight pile according to the present invention.
Icon: 1-compounding a reinforcement cage; 11-vertical geogrids; 12-an annular geogrid; 2-light soil; 10-protecting the pipe; 20-an annular hoop; 30-a scaffold; 4-pumping the pipe; 41-annular lock catch; 5-quincunx hole site; 6-installing a composite light pile; 7-lower composite light pile; 8-connecting reinforcing steel bars; 9-annular plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Referring to fig. 1, the composite light pile structure of the invention comprises pile-forming light soil 2 and a composite reinforcement cage 1 embedded in the pile-forming light soil 2, wherein the composite reinforcement cage 1 is composed of vertical geogrids 11 arranged at intervals in the circumferential direction and annular geogrids 12 arranged at intervals in the vertical direction, the vertical geogrids 11 and the annular geogrids 12 are connected into a whole in an intersecting manner, and quadrilateral meshes are formed between two adjacent vertical geogrids 11 and two adjacent annular geogrids 12.
In the scheme, the method comprises the following steps:
the compressive strength of the light soil 2 is fully exerted firstly by the composite light pile, the tensile capacity of the geogrid is utilized by the composite reinforcement cage 1, the annular geogrid 12 plays a role of hooping under the action of pile top load, so that the pile body can provide higher compressive capacity, the pile crushing or pile breaking is avoided, and in addition, the composite reinforcement cage 1 plays a role of a rib body, and the composite light pile can be prevented from cracking.
With reference to fig. 1, 2, 3 and 4, another technical problem to be solved by the present invention is to provide a method for manufacturing the composite lightweight pile structure, which includes the following steps:
s1: erecting steel protection pipes from bottom to top in sections;
s2: sleeving the upper end of the composite reinforcement cage 1 into the outer wall of the outlet end of the pumping pipe 4, locking the upper end by using an annular lock catch 41, and feeding the composite reinforcement cage 1 into the steel protection pipe;
s3: slowly injecting the light soil 2 into the steel protective pipe through the pumping pipe 4 until the steel protective pipe is filled with the light soil 2, then loosening the annular lock catch 41 and pumping out the pumping pipe 4;
s4: when the light soil 2 reaches 80% of the designed strength grade, binding the fixed cable on the upper steel protective pipe and suspending the fixed cable to a crane, and sequentially dismantling the triangular supports from top to bottom;
s5: the composite light pile is gradually laid on the ground through a crane and a fixed cable, and the steel protective pipe is removed in sections.
In the above manufacturing method:
in step S1, the steel protection pipe is semi-open, each section of steel protection pipe should be locked by the annular hoop 20 in time, and a triangular bracket is set up in the middle of the steel protection pipe.
In step S2, a weight is added to the lower portion of the composite reinforcement cage 1, which is used to ensure the vertical perpendicularity of the composite reinforcement cage 1.
In step S4, a fixing cable is tied to the upper steel casing and suspended to the crane, which is used to prevent the steel casing and the composite lightweight pile from collapsing when the triangular support is removed.
Another technical problem to be solved by the present invention is to provide a construction method of the composite light pile structure, including the steps of:
a1: conveying the composite light pile reaching 100% of the designed strength grade to the site;
a2: drilling holes at the designed pile positions by a drilling machine and cleaning residues at the bottoms of the holes to form foundation drill holes;
a3: hoisting the composite light pile by a crane and placing the composite light pile into a foundation drill hole, and connecting the upper section of the composite light pile and the lower section of the composite light pile by adopting pile extension;
a4: and pouring cement mortar along the pile side of the composite lightweight pile until the pile top.
In the above construction method:
in the step A2, the hole diameter of the foundation drilling hole is slightly larger than the pile diameter of the composite light pile.
Referring to fig. 5 and 6, another technical problem to be solved by the present invention is to provide a pile extension method of the above composite lightweight pile structure, which includes the following steps:
b1: arranging corresponding quincunx hole sites 5 at the pile tops of the lower composite light piles 7 and the pile bottoms of the upper composite light piles 6, and drilling holes;
b2: after the lower composite light pile 7 is placed into a foundation for drilling, connecting steel bars 8 are implanted into pile top hole positions and grouting is carried out;
b3: the quincunx hole site 5 at the bottom of the upper composite light pile 6 is aligned with the pile top connecting steel bar 8 of the lower composite light pile 7;
b4: the joint of the upper and the lower composite light piles is fixedly connected by adopting an annular steel plate in a wrapping manner, and the composite light piles are continuously and slowly arranged in the foundation drill holes.
In the pile splicing method:
in step B1, the hole depth is not less than 1.0m and the hole diameter is not less than the diameter of the connecting steel bar 8 implanted in step B2.
In the step B4, in the process of placing the composite light pile, the hoisting cable tied to the lower composite light pile 7 is not released, and the function is that the gravity of the lower composite light pile 7 is transmitted to the crane through the cable, so that the phenomenon that the lower composite light pile 7 pulls the upper composite light pile is avoided, and the pile splicing connection effect is influenced.
The composite light pile structure and the manufacturing and construction method can better meet the engineering construction requirements of complex interrelations, have the characteristics of novel structure, safety, reliability, investment saving, simple construction and the like, and are clear in design flow and construction method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The composite light pile structure is characterized by comprising light soil (2) and a composite reinforcement cage (1), wherein the composite reinforcement cage (1) is embedded in the light soil (2);
the composite reinforcement cage (1) comprises vertical geogrids (11) arranged at intervals along the circumferential direction and annular geogrids (12) arranged at intervals along the circumferential direction, wherein the vertical geogrids (11) are connected with the annular geogrids (12) in an intersecting manner to form a whole, and the vertical geogrids (11) are connected with the adjacent geogrids (12) to form quadrilateral meshes between the annular geogrids (12).
2. A method for manufacturing a composite lightweight pile, which is used for manufacturing the composite lightweight pile structure according to claim 1, comprising the steps of:
s1: erecting a protective pipe (10) from bottom to top in sections;
s2: sending the composite reinforcement cage (1) into a protective pipe (10);
s3, injecting the light soil (2) into the protective pipe (10) until the protective pipe (10) is filled with the light soil (2);
and S4, dismantling the protective pipe (10) in sections.
3. A method for manufacturing a composite light pile according to claim 2, wherein the protective pipe (10) is semi-open, a support (30) and an annular hoop (20) are arranged on the protective pipe (10), the annular hoop (20) is locked at the erection position of each section of the protective pipe (10), and the support (30) is erected outside each section of the protective pipe (10).
4. The method for manufacturing a composite lightweight pile according to claim 2, wherein in the step S2, a weight is provided at a lower portion of the composite reinforcement cage (1).
5. The method for manufacturing a composite lightweight pile according to claim 2, wherein in the step S2, the upper end of the composite reinforcement cage (1) is sleeved on the outer wall of the outlet end of the pumping pipe (4) and locked by an annular lock catch (41).
6. A method for constructing a composite lightweight pile, which is used for constructing the composite lightweight pile structure according to claim 1, comprising the steps of:
a1, forming a foundation drill hole;
a2, placing the composite light pile into a foundation borehole, and connecting the upper section of the composite light pile with the lower section of the composite light pile by adopting pile extension;
and A3, pouring cement mortar along the pile side of the composite light pile until the pile top.
7. The pile splicing method of the composite light pile structure is characterized by comprising the following steps of:
b1: arranging corresponding hole sites at the pile top of the lower composite light pile (7) and the pile bottom of the upper composite light pile (6) and drilling holes;
b2: after the lower composite light pile (7) is placed into a foundation for drilling, connecting steel bars (8) are implanted into pile top hole positions and grouting is carried out;
b3: the hole position of the pile bottom of the upper composite light pile (6) is aligned to the pile top connecting steel bar (8) of the lower composite light pile (7);
b4: the joint of the upper and the lower composite light piles is fixedly connected by adopting an annular plate (9) in a wrapping way, and the composite light piles are continuously arranged in the foundation drill holes.
8. A pile extension method of composite light pile construction according to claim 7, characterized in that in the step B1, the hole depth is drilled not less than 1.0m and the hole diameter is not less than the diameter of the connecting steel bar (8) implanted in the step B2.
9. A pile extension method of a composite lightweight pile construction according to claim 7, wherein: in the step B4, during the composite light-weight pile placing process, a hoisting rope is bound on the lower composite light-weight pile (7), and the hoisting rope bound on the lower composite light-weight pile (7) is not released.
10. A pile extension method of composite light pile construction according to claim 7, characterized in that in steps B1 and B3, the hole site is a quincunx hole site (5).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010209780.6A CN111395312A (en) | 2020-03-23 | 2020-03-23 | Composite light pile structure, manufacturing method, construction method and pile splicing method |
| PCT/CN2020/141006 WO2021190044A1 (en) | 2020-03-23 | 2020-12-29 | Composite lightweight pile structure, manufacturing method, construction method and pile connecting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010209780.6A CN111395312A (en) | 2020-03-23 | 2020-03-23 | Composite light pile structure, manufacturing method, construction method and pile splicing method |
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| CN111395312A true CN111395312A (en) | 2020-07-10 |
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| CN113026711A (en) * | 2021-03-10 | 2021-06-25 | 武汉广益交通科技股份有限公司 | Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method |
| WO2021190044A1 (en) * | 2020-03-23 | 2021-09-30 | 中铁二院工程集团有限责任公司 | Composite lightweight pile structure, manufacturing method, construction method and pile connecting method |
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| CN116043836B (en) * | 2022-12-30 | 2023-07-25 | 南京交通职业技术学院 | Waste mud solidified pile and construction method thereof |
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| WO2021190044A1 (en) * | 2020-03-23 | 2021-09-30 | 中铁二院工程集团有限责任公司 | Composite lightweight pile structure, manufacturing method, construction method and pile connecting method |
| CN113026711A (en) * | 2021-03-10 | 2021-06-25 | 武汉广益交通科技股份有限公司 | Fiber reinforced foam solidified soil hard shell layer foundation structure and construction method |
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| WO2021190044A1 (en) | 2021-09-30 |
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