CN112342857A - Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed - Google Patents
Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed Download PDFInfo
- Publication number
- CN112342857A CN112342857A CN202011162603.3A CN202011162603A CN112342857A CN 112342857 A CN112342857 A CN 112342857A CN 202011162603 A CN202011162603 A CN 202011162603A CN 112342857 A CN112342857 A CN 112342857A
- Authority
- CN
- China
- Prior art keywords
- hollow
- prefabricated
- hollow slab
- prefabricated hollow
- road
- 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.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a permafrost region prefabricated hollow slab base layer pavement structure capable of accelerating construction speed, which comprises a graded gravel cushion layer, a prefabricated hollow slab base layer, a graded gravel layer and an asphalt surface layer which are sequentially paved from bottom to top; the prefabricated hollow slab base layer comprises prefabricated hollow slabs which are arranged in an N-M matrix; h hollow holes are arranged in each prefabricated hollow slab at equal intervals; forming equal-width polygonal cast-in-place belts between every two N prefabricated hollow plates in each row along the longitudinal direction of the road, and forming the N prefabricated hollow plates in each row into a whole by pouring cement-based grouting material; along the road is horizontal, the homogeneous phase laminating concatenation between M hollow core slab in every row, H hollow holes of M hollow core slab all align, form the heat dissipation through-hole that is linked together with ambient atmosphere. The invention adopts the hollow holes to dredge heat, has the function of protecting frozen soil, can improve the construction speed and stability of the prefabricated hollow slab, and can be widely applied to the construction of roads in permafrost regions.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a permafrost region prefabricated hollow slab base pavement structure capable of accelerating construction speed.
Background
The frozen soil is soil and rock with negative temperature and containing ice, and is mainly divided into perennial frozen soil and seasonal frozen soil according to the survival time. The perennial frozen soil area of China occupies about 22.4 percent of the land area, and is the third frozen soil big country in the world. Frozen earth is extremely complex in nature and extremely temperature sensitive due to the presence of ice and unfrozen water. The temperature rise of frozen soil can be caused by road engineering construction and global warming, so that thawing and sinking diseases are brought to a roadbed, and the stability of roads in permafrost regions is seriously damaged.
In order to reduce heat accumulation in the roadbed and relieve frozen soil thawing, domestic and foreign scholars have proposed a series of methods for protecting frozen soil, such as: the method comprises a stone roadbed, a hot rod technology, a ventilating pipe roadbed, a heat insulation layer, a sun shield technology and the like, and the methods have a certain roadbed cooling effect after the inspection of actual engineering. However, the method has certain limitations, and the problem that heat enters the roadbed from the road surface cannot be fundamentally solved.
In addition, the construction period is long because the road construction in the conventional permafrost region needs to be carried out on site.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a permafrost region precast hollow slab base layer pavement structure capable of accelerating construction speed, aiming at the defects of the prior art, and the permafrost region precast hollow slab base layer pavement structure capable of accelerating construction speed is used for dredging heat invading into the pavement structure by arranging hollow holes in the precast hollow slab base layer. In addition, through the hollow core slab, the construction progress can be accelerated, and the construction stability is improved.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a can accelerate construction speed's permafrost region precast hollow slab base course road surface structure, includes from supreme gradation gravel bed course, precast hollow slab base course, gradation gravel layer and the pitch surface course of laying in proper order down.
The prefabricated hollow slab base layer comprises a plurality of prefabricated hollow slabs which are arranged in an N-M matrix, wherein N is the number of the prefabricated hollow slabs contained in each column along the longitudinal direction of a road, and M is the number of the prefabricated hollow slabs contained in each row along the transverse direction of the road.
H hollow holes are arranged in each prefabricated hollow slab at equal intervals, and each hollow hole is transversely arranged along a road.
And in the longitudinal direction of the road, N prefabricated hollow plates in each row form a polygonal cast-in-place strip with the same width between every two prefabricated hollow plates, and cement-based grouting materials are poured in the polygonal cast-in-place strips, so that the number of the N prefabricated hollow plates in each row forms a whole.
Along the horizontal direction of the road, the M hollow core slabs in each row are attached and spliced with each other. After splicing, H hollow holes of the M hollow core slabs in each row are aligned to form a heat dissipation through hole which is transversely communicated along a road. Both sides of the heat dissipation through hole are communicated with the ambient atmosphere.
The polygonal cast-in-place belt is in a wave shape or a sawtooth shape.
When the polygonal cast-in-place belt is in a sawtooth shape, the longitudinal section of each sawtooth is in an isosceles trapezoid shape.
The circle center of each hollow hole is located on the central section of the prefabricated hollow slab, and the diameter of each hollow hole is 10-20 cm.
Every heat dissipation through-hole all is 0~30 contained angle between horizontal with the road, and specific angle value is confirmed according to local wind direction, makes heat dissipation through-hole face local wind direction for the air current convection current.
The thickness of grading gravel bed course is 15~20cm, and the thickness of prefabricated hollow slab base layer is 20~40cm, and the thickness of grading gravel layer is 8~15cm, and the thickness of pitch surface course is 4~10 cm.
Each prefabricated hollow slab is prefabricated and formed by C30 plain concrete.
The invention has the following beneficial effects:
1. the permafrost region is lower in annual average temperature, sets up the horizontal hollow core hole that link up in the basic unit, can effectively increase the contact surface of basic unit and air, flows in the hollow core hole through the air, makes the temperature of basic unit and temperature tend to unanimous around the hole, dredges the absorptive heat in road surface, reduces thermal download, plays the effect of protection frozen soil.
2. Forced convection of air in the hollow holes is the main reason for generating the cooling effect of the permafrost layer. In cold seasons, the hollow holes can introduce external cold air into the soil, so that the temperature of the base layer is reduced, and the active cooling effect is generated on the underlying permafrost; in warm seasons, external hot air also enters the pipe, and the introduced heat can have adverse effect on the thermal stability of the permafrost. However, from the perspective of annual heat balance, the heat release of the hollow holes is greater than the heat absorption, which is beneficial to improving the thermal stability of the permafrost region.
3. The invention adopts plain concrete as the rigid base layer, has better bearing performance than a semi-rigid base layer, and can integrally meet the bearing capacity of the base layer.
4. The fast block is installed, the transverse part between the first precast slab and the second precast slab is lapped, and cast-in-place concrete is cast, so that the integrity of a base layer is increased, and the function of integrally transferring load is achieved. In addition, through the hollow core slab, the construction progress can be accelerated, and the construction stability is improved.
Drawings
FIG. 1 is a sectional view showing a pavement structure of a precast hollow slab base course in a permafrost region, which can increase the construction speed according to the present invention.
Fig. 2 is a three-dimensional structural view showing a hollow core slab according to the present invention.
FIG. 3 is a view showing a matrix arrangement of the prefabricated hollow core panel according to the present invention.
Among them are: 1. prefabricating a hollow slab base layer; 2. applying an asphalt surface layer; 3. a lower asphalt surface layer; 4. grading a crushed stone layer; 5. a graded gravel cushion layer; 6. prefabricating a hollow slab; 7. a hollow bore; 8. a polygonal boundary surface; 9. a polygonal cast-in-place strip.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in figure 1, the permafrost region precast hollow slab base layer pavement structure capable of accelerating construction speed comprises a graded gravel cushion layer 5, a precast hollow slab base layer 1, a graded gravel layer 4 and an asphalt surface layer which are sequentially paved from bottom to top.
Gradation gravel cushion layer 5 is laid on the surface of the underlying permafrost roadbed and is used for supporting prefabricated hollow slab base layer 1, and the thickness is preferably 15-20 cm.
The precast hollow slab base layer comprises a plurality of precast hollow slabs 6 which are arranged in an N x M matrix, wherein N is the number of the precast hollow slabs contained in each column along the longitudinal direction of the road, and M is the number of the precast hollow slabs contained in each row along the transverse direction of the road.
The main body of the prefabricated hollow slab 6 is preferably prefabricated and formed by C30 plain concrete, the bearing performance is better than that of a semi-rigid base layer, and the cost can be reduced while the bearing capacity of the base layer can be integrally met.
As shown in fig. 2 and 3, the hollow preform slab is preferably a rectangular parallelepiped slab having a top face, a bottom face, two long side faces and two wide side faces.
Both long sides of the hollow core slab are polygonal boundary surfaces 8, each of which preferably has a wave-shaped or zigzag-shaped cross section. When the polygonal cast-in-place strip is in a sawtooth shape, the longitudinal section of each sawtooth is preferably in an isosceles trapezoid shape. The design has the advantages of convenient construction, field installation and quick construction, strengthens occlusion through the polygonal structure, and is connected into a whole through the cast-in-place section to bear force integrally. In addition, the polygon in the invention is formed by the occlusion between the boundaries and the whole stress formed by the cast-in-place belt.
H hollow holes which are communicated along the length direction are distributed in the prefabricated hollow plate between the two polygonal boundary surfaces at equal intervals. The size of the prefabricated hollow plate is preferably 1m x 0.3m, the diameter of each hollow hole 7 is preferably determined according to the thickness of the prefabricated hollow plate, and is further preferably 10-20 cm, and the length of the plate can be properly adjusted according to the size and the spacing of the hollow holes 7.
Furthermore, the circle center of each hollow hole is located on the central section of the prefabricated hollow slab.
And in the longitudinal direction of the road, forming polygonal cast-in-place belts with the same width (preferably 2 cm) between every two N prefabricated hollow plates in each row, and pouring cement-based grouting material in the polygonal cast-in-place belts to enable the number of the N prefabricated hollow plates in each row to form a whole.
Along the horizontal direction of the road, the M hollow core slabs in each row are attached and spliced with each other. After splicing, H hollow holes of the M hollow core slabs in each row are aligned to form a heat dissipation through hole which is transversely communicated along a road. Both sides of the heat dissipation through hole are communicated with the ambient atmosphere.
In fig. 3, a cast-in-place strip is also arranged between every two M hollow slabs in each row, in the cast-in-place process, PVC pipes, PE pipes, steel corrugated pipes and the like are adopted to reserve holes with cast-in-place holes, and after the construction is finished, the template is removed; thereby preventing the blockage of the heat dissipation through-hole. The reserved cast-in-place zone can strengthen transverse connection, and in addition, the arrangement of the graded broken stone layer can prevent the seam of the base layer from being transmitted to the surface layer to form a reflection crack.
The spliced hollow holes (namely the heat dissipation through holes) and the transverse direction of the road preferably form an included angle of 0-30 degrees, and the specific angle value is determined according to the local wind direction, so that the hollow holes face the local wind direction, and the air flow convection is accelerated.
And a graded broken stone layer is laid on the top of the prefabricated hollow slab base layer and serves as a transition layer and a stress absorption layer. The thickness of the graded broken stone layer is preferably 8-15 cm.
Lay the pitch surface course at the top of grading rubble layer, the preferred mode that adopts the layering to lay of pitch surface course, and preferred two-layer the laying of dividing is pitch surface course and last pitch surface course down respectively in this application, and the total thickness of laying of pitch surface course is preferred 4~10 cm.
The permafrost region is lower in annual average temperature, and the ventilation hole that transversely link up is set up at the basic unit, can effectively increase the contact surface of basic unit and air, flows in the hole through the air, makes the temperature of basic unit and temperature tend to unanimous around the hole, dredges the absorptive heat in road surface, reduces thermal biography, plays the effect of protection frozen soil.
The permafrost region prefabricated hollow slab base pavement structure capable of accelerating construction speed effectively channels heat invading the pavement structure through the hollow holes of the base. Meanwhile, the prefabricated parts are spliced on site, so that the construction speed can be increased, the construction stability can be improved, and the method can be widely applied to road construction in permafrost regions.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (7)
1. The utility model provides a can accelerate construction speed's permafrost region precast hollow slab basic unit pavement structure which characterized in that: the prefabricated hollow slab comprises a graded gravel cushion layer, a prefabricated hollow slab base layer, a graded gravel layer and an asphalt surface layer which are sequentially paved from bottom to top;
the prefabricated hollow slab base layer comprises a plurality of prefabricated hollow slabs which are arranged in an N-M matrix, wherein N is the number of the prefabricated hollow slabs contained in each column along the longitudinal direction of the road, and M is the number of the prefabricated hollow slabs contained in each row along the transverse direction of the road;
h hollow holes are distributed in each prefabricated hollow slab at equal intervals, and each hollow hole is transversely distributed along a road;
the method comprises the following steps that (1) along the longitudinal direction of a road, N prefabricated hollow slabs in each row form a polygonal cast-in-place strip with the same width between every two prefabricated hollow slabs, and cement-based grouting materials are poured in the polygonal cast-in-place strips, so that the number of the N prefabricated hollow slabs in each row forms a whole;
along the transverse direction of the road, the M hollow slabs in each row are attached and spliced with each other; after splicing, aligning H hollow holes of the M prefabricated hollow plates in each row to form a heat dissipation through hole which is transversely communicated along a road; both sides of the heat dissipation through hole are communicated with the ambient atmosphere.
2. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 1, characterized in that: the polygonal cast-in-place belt is in a wave shape or a sawtooth shape.
3. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 2, characterized in that: when the polygonal cast-in-place belt is in a sawtooth shape, the longitudinal section of each sawtooth is in an isosceles trapezoid shape.
4. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 1, characterized in that: the circle center of each hollow hole is located on the central section of the prefabricated hollow slab, and the diameter of each hollow hole is 10-20 cm.
5. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 1, characterized in that: every heat dissipation through-hole all is 0~30 contained angle between horizontal with the road, and specific angle value is confirmed according to local wind direction, makes heat dissipation through-hole face local wind direction for the air current convection current.
6. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 1, characterized in that: the thickness of grading gravel bed course is 15~20cm, and the thickness of prefabricated hollow slab base layer is 20~40cm, and the thickness of grading gravel layer is 8~15cm, and the thickness of pitch surface course is 4~10 cm.
7. The permafrost region precast hollow slab base pavement structure capable of accelerating construction speed according to claim 1, characterized in that: each prefabricated hollow slab is prefabricated and formed by C30 plain concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011162603.3A CN112342857A (en) | 2020-10-27 | 2020-10-27 | Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011162603.3A CN112342857A (en) | 2020-10-27 | 2020-10-27 | Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112342857A true CN112342857A (en) | 2021-02-09 |
Family
ID=74358665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011162603.3A Pending CN112342857A (en) | 2020-10-27 | 2020-10-27 | Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112342857A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680005A (en) * | 2022-10-09 | 2023-02-03 | 中交第一公路勘察设计研究院有限公司 | Assembled overhead structure of highway in high-intensity permafrost region and construction method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201420272Y (en) * | 2009-06-17 | 2010-03-10 | 重庆交通大学 | Combined-type vent pipe used in cold region engineering |
| WO2013190400A1 (en) * | 2012-06-22 | 2013-12-27 | Roofingreen S.R.L. | A modular panel for the composition of ventilated floors or walls |
| CN204608547U (en) * | 2015-05-05 | 2015-09-02 | 中交第一公路勘察设计研究院有限公司 | A kind of Permafrost Area is for spreading the ventilation curb of flexible pavement heat |
| CN106676987A (en) * | 2016-12-29 | 2017-05-17 | 中交第公路勘察设计研究院有限公司 | Construction method for rubble stone-ventilating board composite roadbed of expressway at permafrost area |
| CN206233052U (en) * | 2016-11-22 | 2017-06-09 | 李想 | A kind of new-type pavement structure for being adapted to Permafrost Area |
| CN108642992A (en) * | 2018-04-28 | 2018-10-12 | 江西博慧工程技术服务有限公司 | A kind of cement pavement structure and construction method |
| CN110644323A (en) * | 2019-09-10 | 2020-01-03 | 中交武汉港湾工程设计研究院有限公司 | Pavement slab, pavement structure and construction method suitable for temporary road soft soil foundation |
| CN111676759A (en) * | 2020-05-07 | 2020-09-18 | 中国一冶集团有限公司 | Assembly type temporary construction road and construction method |
-
2020
- 2020-10-27 CN CN202011162603.3A patent/CN112342857A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201420272Y (en) * | 2009-06-17 | 2010-03-10 | 重庆交通大学 | Combined-type vent pipe used in cold region engineering |
| WO2013190400A1 (en) * | 2012-06-22 | 2013-12-27 | Roofingreen S.R.L. | A modular panel for the composition of ventilated floors or walls |
| CN204608547U (en) * | 2015-05-05 | 2015-09-02 | 中交第一公路勘察设计研究院有限公司 | A kind of Permafrost Area is for spreading the ventilation curb of flexible pavement heat |
| CN206233052U (en) * | 2016-11-22 | 2017-06-09 | 李想 | A kind of new-type pavement structure for being adapted to Permafrost Area |
| CN106676987A (en) * | 2016-12-29 | 2017-05-17 | 中交第公路勘察设计研究院有限公司 | Construction method for rubble stone-ventilating board composite roadbed of expressway at permafrost area |
| CN108642992A (en) * | 2018-04-28 | 2018-10-12 | 江西博慧工程技术服务有限公司 | A kind of cement pavement structure and construction method |
| CN110644323A (en) * | 2019-09-10 | 2020-01-03 | 中交武汉港湾工程设计研究院有限公司 | Pavement slab, pavement structure and construction method suitable for temporary road soft soil foundation |
| CN111676759A (en) * | 2020-05-07 | 2020-09-18 | 中国一冶集团有限公司 | Assembly type temporary construction road and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 彭澎等: "《高速公路工程质量通病处治手册》", 31 August 2006, 湖南科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680005A (en) * | 2022-10-09 | 2023-02-03 | 中交第一公路勘察设计研究院有限公司 | Assembled overhead structure of highway in high-intensity permafrost region and construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102493306B (en) | Construction method of expressway insulating regulation subgrade in permafrost areas | |
| CN107747261A (en) | A kind of new Soft Clay seasonal frozen soil region highway subgrade structure and construction method | |
| CN110846963A (en) | Steel plate structure, steel plate pavement structure and construction method thereof | |
| CN108589456B (en) | Direct-insert oblique-insert alternating heat pipe roadbed structure and construction method thereof | |
| CN108547195A (en) | A kind of porous asphalt pavement structure and construction method | |
| CN113250211A (en) | Construction method for highway cutting slope in permafrost region | |
| CN113073538A (en) | High pile plate-soil combined road | |
| CN216809384U (en) | Railway roadbed suitable for island frozen soil area | |
| CN112342857A (en) | Permafrost region precast hollow slab base pavement structure capable of accelerating construction speed | |
| CN211848680U (en) | Steel plate structure and steel plate pavement structure | |
| CN112376344A (en) | Double-layer continuous reinforced concrete hollow slab concrete pavement composite structure for permafrost region and construction method | |
| CN112342858A (en) | Permafrost region precast hollow slab base pavement structure | |
| CN205617177U (en) | Compound cold -storage roadbed structure suitable for permafrost region road engineering | |
| CN210797110U (en) | Plateau permafrost region high-speed railway hollow module cutting structure | |
| CN211285121U (en) | Road surface board and road surface structure suitable for interim road weak soil foundation | |
| CN102808417A (en) | Side slope protection method for arid desert area | |
| US11987937B1 (en) | Airflow-enhanced embankment ventilation structure, composite embankment structure, and construction method thereof | |
| CN207484194U (en) | A kind of seamless road surface of assembling beam and slab type | |
| CN107201701B (en) | Full-wall ventilation type frozen soil ventilation embankment | |
| RU2236498C1 (en) | Arch-type filled bridge | |
| CN117552280A (en) | Cooling roadbed structure for permafrost region and construction method | |
| RU2780999C1 (en) | Method for construction of a road on permafrost soils | |
| CN112342855B (en) | Prefabricated assembly type hollow cement concrete base plate structure and construction method | |
| CN217150150U (en) | Permafrost region highway cutting slope structure | |
| CN213925903U (en) | Road and bridge crack reinforced structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210209 |