CN114319001B - Method for solving insufficient soil covering thickness when pipe jacking construction in soft soil area passes through existing road - Google Patents
Method for solving insufficient soil covering thickness when pipe jacking construction in soft soil area passes through existing road Download PDFInfo
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- CN114319001B CN114319001B CN202111675758.1A CN202111675758A CN114319001B CN 114319001 B CN114319001 B CN 114319001B CN 202111675758 A CN202111675758 A CN 202111675758A CN 114319001 B CN114319001 B CN 114319001B
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 239000002689 soil Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000010410 layer Substances 0.000 claims abstract description 66
- 229910052742 iron Inorganic materials 0.000 claims abstract description 54
- 239000010426 asphalt Substances 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 18
- 239000004927 clay Substances 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road. And (3) sequentially fully paving an iron plate layer and an SMA asphalt mixture surface layer above a road along the jacking range of the jacking pipe and in the jacking direction of the jacking pipe at the standard section of the jacking pipe, dispersing the vehicle load, and reducing the influence of vehicle traffic on jacking operation. The iron plate layer consists of iron plates which are sequentially stacked, and the asphalt is SMA asphalt mixture. According to the method, the steel plate is paved on the fast road with the top pipe penetrating through the north ring as the access board, so that the load above the top pipe is increased, the influence of travelling crane on the construction of the top pipe is reduced, and compared with the construction speed of pouring the concrete access board, the method has the advantages of small influence on traffic and low manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of construction, and particularly relates to a method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road.
Background
As shown in fig. 1-2, 2 round jacking pipes are adopted, the total length of each jacking pipe is 108.6m, 55 sections are total, the inner diameter of each jacking pipe is 2.4m, the outer diameter of each jacking pipe is 2.86m, and the horizontal clear distance between 2 jacking pipes is 2.86m. The geological distribution condition of the north loop express way section from top to bottom: the first road pavement structure layer is 0.74 meter; the second layer of road subgrade slag filling layer is 1.5 meters; the third layer of gray yellow clay is commonly called a hard crust layer on the earth surface, has the thickness of 0.6 meter, is plastic mainly and has medium compressibility and good engineering properties; fourth layer of gray silty powdery clay with thickness of 18 meters, the layer of clay is flowing plastic-shaped, high-compressibility and soft clay with poor engineering property.
As shown in fig. 3, the position of the pipe-jacking north-loop express way is influenced by the existing pipeline, the elevation of the inner bottom of the pipe is designed to be-2.8, the elevation of the pavement of the north-loop express way is 3.05-3.30 m, the earth covering thickness of the pipe-jacking of the north-loop section is 3.23-3.48 m, the earth covering thickness is less than the 1.5D earth covering thickness requirement, and the head of the pipe-jacking machine floats upwards and is out of control in the construction process very easily.
The north ring expressway is a main channel in the area, is connected with a high-speed outlet, has large traffic flow, cannot interrupt traffic in the construction process and has a large number of heavy vehicles, and the load when the heavy vehicles pass through the north ring expressway when the pipe is pushed through the north ring expressway can bring great potential safety hazards to pipe pushing construction, so that the pavement collapse is seriously possibly caused.
In order to solve the problem that the head of the push bench floats upwards and reduces the interference to the push bench when a heavy truck passes due to insufficient thickness and insufficient load of the earthing, the common method comprises the following steps:
1) When the jacking pipe passes through the north ring expressway, traffic is interrupted, and earth and stone sides are adopted for stacking at the position of a roadway to meet load requirements and avoid the influence of travelling crane on jacking pipe construction, so that the method is not applicable according to the field situation;
2) Reinforced concrete access boards are poured above the quick way that the jacking pipe passes through the north ring, the load above the jacking pipe is increased, the influence of travelling crane on jacking pipe construction is reduced, and the scheme has a long maintenance time after concrete pouring and has a large influence on traffic.
Disclosure of Invention
The invention provides a method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road.
The technical scheme of the invention is as follows:
a method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road comprises the following steps:
and (3) sequentially fully paving an iron plate layer and an SMA asphalt mixture surface layer above a road along the jacking range of the jacking pipe and in the jacking direction of the jacking pipe at the standard section of the jacking pipe, dispersing the vehicle load, and reducing the influence of vehicle traffic on jacking operation.
Preferably, in the method for solving the problem of insufficient soil covering thickness when the pipe jacking construction in the soft soil area passes through the existing road, the iron plate layer consists of iron plates which are sequentially stacked, and the asphalt is SMA asphalt mixture. Stacking is carried out by using an iron plate: firstly, the stacking weight requirement can be met by using a relatively thin thickness; the second iron plate is fast in stacking construction speed, can be completed in 6-7 hours, can quickly recover traffic, and can recover traffic only by sealing construction when vehicles passing through roads are rare after twelve points at night to 7 points at the next day; (if soil or other materials are adopted for stacking, the height of 1.2 is filled for 4-6 times in layers, more than 24 hours are needed for construction, the strength of the filled roadbed after filling cannot meet the traffic requirement, the water is required to be paved for stabilizing the layer, then asphalt is required to be paved for meeting the traffic requirement, and the construction time is more than one month, so that the traffic can be recovered); thirdly, the construction using the iron plate and SMA asphalt mixture basically has no pollution to the road, the surrounding road is polluted by using earth or pond residue filling, and the dust emission is larger; fourthly, the iron plate can effectively disperse load when the vehicle passes, so that the influence of the vehicle passing on the pipe jacking construction is reduced to the greatest extent; the iron plate can be recovered after the fifth construction is completed, and other materials are needed to find places again for disposal.
Preferably, the thickness of the iron plate layer is 15-25cm, and the thickness of the asphalt mixture surface layer is 3-5cm.
Preferably, the iron plate layer is formed by mutually staggered stacking a plurality of layers of iron plates, the seam of the upper layer and the seam of the lower layer are staggered for 50 centimeters, the size of each layer of iron plate is 2 x 6m, and the edges of the iron plates are mutually staggered trapezoids or waves for mutual engagement of two adjacent iron plates when the iron plates are placed.
Preferably, the uppermost iron plate layer is provided with a plurality of reinforcing ribs, and the distance between the two reinforcing ribs is 50cm.
This facilitates the interlocking of the steel sheet layer with the upper asphalt layer.
The thickness of the iron plate is converted according to the insufficient part of the covering soil thickness, and the volume weight of one meter of iron is equal to the volume weight of 5 meters of covering soil, so that the piling height can be greatly reduced by piling and prepressing the iron plate, and the asphalt concrete surface layer is used for ensuring the passing comfort of vehicles and preventing the vehicles from slipping on the iron plate.
Preferably, the paving length of the iron plate layer extends to the two sides from the center line of the jacking pipe by not less than 2.5 times of the jacking pipe width in the jacking direction of the jacking pipe. The influence range of jacking of the jacking pipe on the soil body around the jacking axis perpendicular to the jacking axis is about 4 meters, the diameter of the jacking pipe of the engineering is 2.86, and the jacking pipe extends to two sides from the axial direction by 2.5 times of the width of the jacking pipe, so that the influence on road traffic during jacking construction can be effectively reduced, and the influence of vehicle traffic on jacking construction can be effectively reduced
Preferably, the railway slab layer and the road joint are downhill treated with asphalt with a gradient of 1.5-2.5%. Connect in order to stacking area and current road, when the vehicle passes through, can not cause jolting, greatly reduce the vehicle to the vibrations of foundation below, guarantee driving comfort level.
Preferably, the road geology is distributed from top to bottom: the first road pavement structure layer is 0.74 meter; the second layer of road subgrade slag filling layer is 1.5 meters; a third layer of gray yellow clay with a thickness of 0.6 meter; a fourth layer of gray silty clay with a thickness of 18 meters;
the elevation of the road surface is 3.05-3.30 m, and the earth covering thickness of the road top pipe of the passageway is 3.23-3.48 m.
Preferably, the method comprises the following construction points:
(1) Traffic guiding changes: (a) Selecting the most suitable construction time and selecting the construction in the time period with the least passing vehicles; (b) Traffic guidance is reasonably organized according to the existing road, so that serious traffic jam is avoided; (c) Setting various traffic guiding marks, roadblocks, isolation facilities and night warning signals according to relevant regulations during traffic guiding; building site personnel to assist traffic management departments in guiding traffic in time according to site changes;
(2) The steel plate is selected from: (a) The thickness of the steel plate is converted according to the difference value of the volume weight of steel and the volume weight of soil; (b) The plate laying length extends to two sides from the center line of the jacking pipe by at least 2.5 times of the jacking pipe width in the jacking direction;
(3) Asphalt paving: the paving speed of asphalt is required to be slow to 1-3 m/min, the paving machine needs to slowly, uniformly and continuously pave without changing the speed or stopping midway at will so as to improve the flatness and reduce the segregation of the mixture. The paving and rolling temperatures are higher than the conventional pavement construction temperature, so that the pavement cannot be constructed under the climatic conditions of weather temperature lower than 10 ℃ and in rainy days, and the pavement cannot be compacted easily when the temperature is low;
(4) And (3) asphalt rolling: immediately following the paving, rolling is carried out, and when rolling is carried out, a double-steel-wheel road roller is used, and rolling is forbidden to be carried out by a rubber-wheel road roller or a combined road roller; the initial pressure section is kept short, the initial pressure starting temperature is not lower than 150 ℃, and the surface temperature after rolling is not lower than 90 ℃.
The invention has the following beneficial effects:
the steel plate is paved on the fast road with the top pipe penetrating through the north ring as the access board, the load above the top pipe is increased, the influence of the travelling crane on the top pipe construction is reduced, the scheme has high construction speed compared with the pouring concrete access board, the influence on traffic is small, and the manufacturing cost is low, so the method is selected for the project.
Drawings
FIG. 1 is a geological plan view of a North Ring express road section;
FIG. 2 is a geological planer view of a North Ring express road section;
FIG. 3 is a perspective view of a North Ring express way
FIG. 4 is a construction plan view of a north loop express way section;
FIG. 5 is a construction cross-sectional view of a north loop express way;
FIG. 6 is a flow chart of the construction of the present invention;
FIG. 7 iron plate layer structure diagram-trapezoidal gear;
figure 8 iron sheet layer structure-corrugated.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It should be apparent to those skilled in the art that the examples are merely provided to aid in understanding the present invention and should not be construed as limiting the invention in any way.
Example 1
A method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road comprises the following steps:
and (3) sequentially fully paving an iron plate layer and an SMA asphalt mixture surface layer above a road along the jacking range of the jacking pipe and in the jacking direction of the jacking pipe at the standard section of the jacking pipe, dispersing the vehicle load, and reducing the influence of vehicle traffic on jacking operation.
Preferably, in the method for solving the problem of insufficient soil covering thickness when the pipe jacking construction in the soft soil area passes through the existing road, the iron plate layer consists of iron plates which are sequentially stacked, and the asphalt is SMA asphalt mixture.
Preferably, the thickness of the iron plate layer is 20cm, and the thickness of the asphalt mixture surface layer is 4cm.
Preferably, the iron plate layer is formed by mutually staggered stacking a plurality of layers of iron plates, the seam of the upper layer and the seam of the lower layer are staggered for 50 centimeters, the size of each layer of iron plate is 2 x 6m, and the edges of the iron plates are mutually staggered trapezoids (figure 7) or waves (figure 8) for mutual occlusion of two adjacent iron plates when placed.
Preferably, the uppermost iron plate layer is provided with a plurality of reinforcing ribs, and the distance between the two reinforcing ribs is 50cm.
This facilitates the interlocking of the steel sheet layer with the upper asphalt layer.
The thickness of the iron plate is converted according to the insufficient part of the covering soil thickness, and the volume weight of one meter of iron is equal to the volume weight of 5 meters of covering soil, so that the piling height can be greatly reduced by piling and prepressing the iron plate, and the asphalt concrete surface layer is used for ensuring the passing comfort of vehicles and preventing the vehicles from slipping on the iron plate.
Preferably, the paving length of the iron plate layer extends to the two sides from the center line of the jacking pipe by not less than 2.5 times of the jacking pipe width in the jacking direction of the jacking pipe. The influence range of jacking of the jacking pipe on the soil body around the jacking axis perpendicular to the jacking axis is about 4 meters, the diameter of the jacking pipe of the engineering is 2.86, and the jacking pipe extends to two sides from the axial direction by 2.5 times of the width of the jacking pipe, so that the influence on road traffic during jacking construction can be effectively reduced, and the influence of vehicle traffic on jacking construction can be effectively reduced
Preferably, the railway slab layer and the road joint are downhill treated with asphalt with a gradient of 1.5-2.5%. Connect in order to stacking area and current road, when the vehicle passes through, can not cause jolting, greatly reduce the vehicle to the vibrations of foundation below, guarantee driving comfort level.
Preferably, the road geology is distributed from top to bottom: the first road pavement structure layer is 0.74 meter; the second layer of road subgrade slag filling layer is 1.5 meters; a third layer of gray yellow clay with a thickness of 0.6 meter; a fourth layer of gray silty clay with a thickness of 18 meters;
the elevation of the road surface is 3.05-3.30 m, and the earth covering thickness of the road top pipe of the passageway is 3.23-3.48 m.
The construction key points of the method comprise:
(1) Traffic guiding changes: (a) Selecting the most suitable construction time and selecting the construction in the time period with the least passing vehicles; (b) Traffic guidance is reasonably organized according to the existing road, so that serious traffic jam is avoided; (c) Setting various traffic guiding marks, roadblocks, isolation facilities and night warning signals according to relevant regulations during traffic guiding; building site personnel to assist traffic management departments in guiding traffic in time according to site changes;
(2) The steel plate is selected from: (a) The thickness of the steel plate is converted according to the difference value of the volume weight of steel and the volume weight of soil; (b) The laying length of the steel plate is perpendicular to the jacking direction of the jacking pipe, and the width of the jacking pipe extends from the central line of the jacking pipe to two sides by at least 2.5 times;
(3) Asphalt paving: the paving speed of asphalt is required to be slow to 1-3 m/min, the paving machine needs to slowly, uniformly and continuously pave without changing the speed or stopping midway at will so as to improve the flatness and reduce the segregation of the mixture. The paving and rolling temperatures are higher than the conventional pavement construction temperature, so that the pavement cannot be constructed under the climatic conditions of weather temperature lower than 10 ℃ and in rainy days, and the pavement cannot be compacted easily when the temperature is low;
(4) And (3) asphalt rolling: immediately following the paving, rolling is carried out, and when rolling is carried out, a double-steel-wheel road roller is used, and rolling is forbidden to be carried out by a rubber-wheel road roller or a combined road roller; the initial pressure section is kept short, the initial pressure starting temperature is not lower than 150 ℃, and the surface temperature after rolling is not lower than 90 ℃.
The technical solution of the present invention is explained by the above embodiments, but the present invention is not limited to the above embodiments, i.e. it does not mean that the present invention must be implemented depending on the above specific embodiments. Any modifications, or equivalent substitutions of materials for the invention, which are made by those skilled in the art based on the present invention, fall within the scope of protection of the patent.
Claims (1)
1. A method for solving the problem of insufficient soil covering thickness when pipe jacking construction in a soft soil area passes through an existing road is characterized by comprising the following steps: sequentially fully paving an iron plate layer and an SMA asphalt mixture surface layer above a road in the jacking direction of the jacking pipe along the jacking range of the jacking pipe and the vertical jacking direction of the standard section of the jacking pipe, dispersing vehicle load, and reducing the influence of vehicle traffic on jacking operation; the iron plate layer consists of iron plates which are sequentially stacked, and the asphalt is SMA asphalt mixture;
the iron plate layer is formed by mutually staggered stacking a plurality of layers of iron plates, the seams of the upper layer and the lower layer are staggered for 50 centimeters, the size of each layer of iron plate is 2 x 6m, and the edges of the iron plates are mutually staggered trapezoids or waves for mutual occlusion of two adjacent iron plates when placed;
the paving length of the iron plate layer is perpendicular to the jacking direction of the jacking pipe, and the jacking pipe extends from the center line of the jacking pipe to two sides by not less than 2.5 times of the jacking pipe width;
the iron plate layer and the road joint are subjected to slope release treatment by asphalt, and the slope is 1.5-2.5%;
road geology from top to bottom distribution condition: the first road pavement structure layer is 0.74 meter; the second layer of road subgrade slag filling layer is 1.5 meters; a third layer of gray yellow clay with a thickness of 0.6 meter; a fourth layer of gray silty clay with a thickness of 18 meters; the elevation of the road surface is 3.05-3.30 m, and the earth covering thickness of the road top pipe of the passageway is 3.23-3.48 m; the thickness of the iron plate layer is 15-25cm, and the thickness of the asphalt mixture surface layer is 3-5cm; the uppermost iron plate layer of the iron plate layer is provided with a plurality of reinforcing ribs, and the distance between the two reinforcing ribs is 50cm; the construction key points of the method comprise:
(1) Traffic guiding changes: (a) Selecting the most suitable construction time and selecting the construction in the time period with the least passing vehicles; (b) Traffic guidance is reasonably organized according to the existing road, so that serious traffic jam is avoided; (c) Setting various traffic guiding marks, roadblocks, isolation facilities and night warning signals according to relevant regulations during traffic guiding; building site personnel to assist traffic management departments in guiding traffic in time according to site changes;
(2) The steel plate is selected from: (a) The thickness of the steel plate is converted according to the difference value of the volume weight of steel and the volume weight of soil; (b) The laying length of the steel plate is perpendicular to the jacking direction of the jacking pipe, and the width of the jacking pipe extends from the central line of the jacking pipe to two sides by at least 2.5 times;
(3) Asphalt paving: the paving speed of asphalt is noted, the paving speed is preferably slowed down to 1-3 m/min, the paver needs to slowly, uniformly and continuously pave without changing the speed or stopping midway at will so as to improve the flatness and reduce the segregation of the mixture; the paving and rolling temperatures are higher than the conventional pavement construction temperature, so that the pavement cannot be constructed under the climatic conditions of weather temperature lower than 10 ℃ and in rainy days, and the pavement cannot be compacted easily when the temperature is low;
(4) And (3) asphalt rolling: immediately following the paving, rolling is carried out, and when rolling is carried out, a double-steel-wheel road roller is used, and rolling is forbidden to be carried out by a rubber-wheel road roller or a combined road roller; the initial pressure section is kept short, the initial pressure starting temperature is not lower than 150 ℃, and the surface temperature after rolling is not lower than 90 ℃.
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| CN202111675758.1A CN114319001B (en) | 2021-12-31 | 2021-12-31 | Method for solving insufficient soil covering thickness when pipe jacking construction in soft soil area passes through existing road |
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| CN202111675758.1A CN114319001B (en) | 2021-12-31 | 2021-12-31 | Method for solving insufficient soil covering thickness when pipe jacking construction in soft soil area passes through existing road |
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| CN114319001B true CN114319001B (en) | 2024-03-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001115534A (en) * | 1999-10-21 | 2001-04-24 | Kenji Nakayama | Underground pipe embedding construction |
| CN205775696U (en) * | 2016-06-27 | 2016-12-07 | 南昌轨道交通集团有限公司 | A kind of structure reducing shallow buried covered excavation channel upper traffic loading |
| CN106368369A (en) * | 2016-11-25 | 2017-02-01 | 沈阳建筑大学 | Staggered tooth type thermal insulation building blocks and thermal insulation wall body bricklaying method |
| CN109027422A (en) * | 2018-08-31 | 2018-12-18 | 广东省源天工程有限公司 | A kind of pipe jacking construction method passing through ultra-shallow earth-covered creek |
| CN210621378U (en) * | 2019-04-20 | 2020-05-26 | 中国二十冶集团有限公司 | Load temporary construction road capable of being installed quickly |
| CN113123259A (en) * | 2021-04-15 | 2021-07-16 | 中国瑞林工程技术股份有限公司 | Reinforcing structure for shallow-buried box culvert of road and construction method |
| CN214782979U (en) * | 2021-03-15 | 2021-11-19 | 中建五局土木工程有限公司 | Transition section structure of slate roadbed filler road bridge |
-
2021
- 2021-12-31 CN CN202111675758.1A patent/CN114319001B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001115534A (en) * | 1999-10-21 | 2001-04-24 | Kenji Nakayama | Underground pipe embedding construction |
| CN205775696U (en) * | 2016-06-27 | 2016-12-07 | 南昌轨道交通集团有限公司 | A kind of structure reducing shallow buried covered excavation channel upper traffic loading |
| CN106368369A (en) * | 2016-11-25 | 2017-02-01 | 沈阳建筑大学 | Staggered tooth type thermal insulation building blocks and thermal insulation wall body bricklaying method |
| CN109027422A (en) * | 2018-08-31 | 2018-12-18 | 广东省源天工程有限公司 | A kind of pipe jacking construction method passing through ultra-shallow earth-covered creek |
| CN210621378U (en) * | 2019-04-20 | 2020-05-26 | 中国二十冶集团有限公司 | Load temporary construction road capable of being installed quickly |
| CN214782979U (en) * | 2021-03-15 | 2021-11-19 | 中建五局土木工程有限公司 | Transition section structure of slate roadbed filler road bridge |
| CN113123259A (en) * | 2021-04-15 | 2021-07-16 | 中国瑞林工程技术股份有限公司 | Reinforcing structure for shallow-buried box culvert of road and construction method |
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| CN114319001A (en) | 2022-04-12 |
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