CN113863076B - Sinking road construction method under sand bridge - Google Patents
Sinking road construction method under sand bridge Download PDFInfo
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- CN113863076B CN113863076B CN202111133073.4A CN202111133073A CN113863076B CN 113863076 B CN113863076 B CN 113863076B CN 202111133073 A CN202111133073 A CN 202111133073A CN 113863076 B CN113863076 B CN 113863076B
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- 238000010276 construction Methods 0.000 title claims abstract description 93
- 239000004576 sand Substances 0.000 title claims abstract description 24
- 239000002689 soil Substances 0.000 claims abstract description 62
- 239000010410 layer Substances 0.000 claims abstract description 51
- 239000004568 cement Substances 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000009412 basement excavation Methods 0.000 claims abstract description 12
- 239000002344 surface layer Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002674 ointment Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
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- 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
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
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- 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
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/08—Restraining of underground water by employing open ditches arranged below the level of the water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/22—Lining sumps in trenches or other foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Foundations (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A sinking road construction method under an sand bridge relates to the field of road construction. The construction method of the sunk road under the sand bridge comprises the steps of measuring a lofting and road-out side line, excavating a slope-discharging line on two sides of the sunk road, inclining a station line of a cement mixing pile machine, and stopping a water curtain line and a point; carrying out sinking road excavation by using an excavator from two ends to a station line of the inclined cement mixing pile machine; seamlessly densely distributing pile positions on a station line of an inclined cement mixing pile machine, and then sequentially stirring in a horizontal direction to form an improved soil layer; and (3) constructing a waterproof curtain wall and exposed drainage side ditches on two sides of a road subbase layer of a sunken road after the maintenance of the improved soil layer, then performing anti-floating anchor rod construction in the improved soil layer, and performing ponding side ditch construction, expansion joint construction, road surface layer construction, outer wall waterproof construction and outer wall backfilling construction after the cleaning of the road subbase layer. The sunk road construction method under the sand bridge can stabilize soil and improve foundation bearing capacity under the conditions of insufficient construction clearance and high groundwater level.
Description
Technical Field
The application relates to the field of road construction, in particular to a sinking road construction method under an Africa bridge.
Background
The problems of insufficient construction clearance, high ground water level of roadbed, weak foundation, bridge protection close to construction, high difficulty in water-facing dewatering stopping and the like are frequently encountered in the construction process of the bridge underpass sinking road engineering, the comprehensive problems are treated in a few, medium and few modes, various measures are often used repeatedly in construction, and unpredictable and estimated losses are caused to construction period, quality and safety.
Under the condition of insufficient construction clearance, a method for reducing elevation by excavating a foundation is often thought, but the ground water level is high, the foundation is soft and is close to a pier, so that the foundation cannot be selected; in the face of high groundwater level and high water-facing water-stopping precipitation difficulty, a mode of adopting steel sheet piles or using cast-in-place piles to form waterproof curtains and then carrying out well-point precipitation is often thought, but in the face of insufficient operation clearance, the method cannot be carried out; in the face of weak foundation, the methods of changing filling, cement stirring piles, gravel piles, grouting and the like are often thought, but the method cannot be performed because the soft foundation cannot be perforated due to insufficient facing clearance; in the face of bridge protection close to construction, reinforcing measures for bridge pile foundations are often thought of, but in the face of insufficient under-bridge clearance, soft foundations, high groundwater level and the like, stable protection measures cannot be formed. Under the condition of comprehensively overlaying multiple circumstances, the method can only adopt other modes such as viaduct and clearance limit reduction due to adverse factors such as important quality and safety influence, various measures to be taken, complex construction procedures, long construction period and the like.
Disclosure of Invention
The application aims to provide a sunk road construction method under an Africa bridge, which can stabilize soil mass and solve the defect of insufficient bearing capacity of a foundation, and can carry out sunk road soft foundation treatment construction under the conditions of insufficient under-bridge construction clearance and high underground water level.
Embodiments of the present application are implemented as follows:
the embodiment of the application provides a sinking road construction method under an sand bridge, which comprises the following steps of:
measuring a laying-out and laying-out road side line, a sinking type road two-side excavation laying-out line, an inclined cement mixing pile machine station bit line, a waterproof curtain line and point positions;
the method comprises the steps that a digging machine is used in the dead water period to carry out sinking type road digging from two ends to station bit lines of an inclined cement mixing pile machine, soil under a bridge is reserved as a pre-pressing layer in advance, and a safe and stable slope is formed for slope collection of soil in front of an operation face;
pile positions are seamlessly and densely distributed on a station line of an inclined cement mixing pile machine, construction is synchronously and symmetrically carried out from two sides of a bridge during operation, pile jumping construction is carried out from one side of the bridge to one side close to the water surface, each pile position is firstly carried out vertically during construction, and then the pile positions are sequentially stirred in the horizontal direction to form an improved soil layer;
after maintaining the improved soil layer for more than 7 days, excavating the unexcavated soil under the bridge, and constructing the soil on the water surface to form an inclined waterproof curtain wall;
after the improved soil layer is maintained for more than 14 days, the roadbed of the sinking road is excavated, the drainage collecting ditches are excavated on the two sides of the improved soil layer after the roadbed is excavated to the road subbase, then the anti-floating anchor rod construction is carried out in the improved soil layer,
cleaning, repairing, leveling and waterproofing the road subbase, and then carrying out ponding side ditch construction, expansion joint construction, road surface layer construction, outer wall waterproofing construction and outer wall backfilling construction of the submerged road.
In some alternative embodiments, the inclined cement mixer pile machine station bit line is arranged at an expansion joint of the submerged road, and the distance from the sand bridge is more than 3 m.
In some alternative embodiments, when the sinking road excavation is carried out from two ends to the station bit line of the inclined cement mixer by using the excavator, the distance between the excavation completion surface and the bottom surface of the roadbed is reserved to be a pre-pressing layer above 50cm, and the underground clear water is not seen at the bottom of the completion surface of the excavation of the station bit line of the inclined cement mixer.
In some alternative embodiments, the construction interval time of adjacent pile positions is less than 8 hours when the pile is constructed from one side of the bridge to the water surface side, and the pile positions are subjected to rotary spraying construction according to 3-4 gradient speed changes according to the density change of repeated rotating parts, so that the cement doping amount of the pile positions is 12-18% of the reinforced soil amount.
In some alternative embodiments, the coring strength of the modified soil layer is ∈C15, and the edges of each side of the modified soil layer are 20cm above the outer wall of the submerged road.
In some alternative embodiments, the waterproof curtain wall is formed by double piles, the inclination angle of the waterproof curtain wall is 15-75 degrees, and the minimum vertical distance between the wall body of the waterproof curtain wall and the uphill line of the river levee is more than 2 m.
The beneficial effects of the application are as follows: the sinking road construction method under the sand bridge provided by the embodiment comprises the following steps: measuring a laying-out and laying-out road side line, a sinking type road two-side excavation laying-out line, an inclined cement mixing pile machine station bit line, a waterproof curtain line and point positions; the method comprises the steps that a digging machine is used in the dead water period to carry out sinking type road digging from two ends to station bit lines of an inclined cement mixing pile machine, soil under a bridge is reserved as a pre-pressing layer in advance, and a safe and stable slope is formed for slope collection of soil in front of an operation face; pile positions are seamlessly and densely distributed on a station line of an inclined cement mixing pile machine, construction is synchronously and symmetrically carried out from two sides of a bridge during operation, pile jumping construction is carried out from one side of the bridge to one side close to the water surface, each pile position is firstly carried out vertically during construction, and then the pile positions are sequentially stirred in the horizontal direction to form an improved soil layer; after maintaining the improved soil layer for more than 7 days, excavating the unexcavated soil under the bridge, and constructing the soil on the water surface to form an inclined waterproof curtain wall; and (3) after maintaining the improved soil layer for more than 14 days, excavating a roadbed of a sunk road, excavating drainage collecting ditches on two sides of the improved soil layer until the roadbed of the road is excavated, then performing anti-floating anchor rod construction in the improved soil layer, cleaning, repairing and leveling the roadbed of the road, performing waterproof construction, and then performing ponding side ditch construction, expansion joint construction, road surface layer construction, outer wall waterproof construction and outer wall backfilling construction of the sunk road. The method for constructing the sunk road under the sand bridge provided by the embodiment adopts the inclined cement mixing pile method to improve the soil body, can solve the defect of insufficient bearing capacity of the foundation while stabilizing the soil body, and can carry out the sunk road soft foundation treatment construction under the condition of insufficient construction clearance under the bridge and high groundwater level.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic plan view of an example of a submerged road and an example of a submerged road construction method under an example of the application;
FIG. 2 is a schematic view of a modified soil layer treatment of a sunk road in a sunk road construction method under an sand bridge according to an embodiment of the present application;
fig. 3 is a schematic diagram of a modified soil layer treatment cross section of a sunk road in the sunk road construction method under an sand bridge according to an embodiment of the present application.
In the figure: 100. an sand bridge; 110. tilting a station line of the cement mixing pile machine; 120. improving a soil layer; 130. waterproof curtain wall; 140. an anti-floating anchor rod; 150. collecting drainage ditches; 160. a waterproof layer; 170. is on the water surface.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The characteristics and performances of the submerged road construction method under an sand bridge of the present application are described in further detail below with reference to examples.
As shown in fig. 1, 2 and 3, the embodiment of the application provides a submerged road construction method under an sand bridge, which comprises the following steps:
measuring a lofting and road-out side line, a sinking type road two-side excavation slope-discharging line, an inclined cement mixing pile machine station bit line 110, a waterproof curtain line and point positions; the safety protection distance between the inclined cement mixing pile machine station bit line 110 and the bridge of the sand bridge 100 is 3m, and the inclined cement mixing pile machine station bit line 110 is positioned at an expansion joint of the submerged road structure;
on sunny days in a dead water period, a digging machine is used for digging a sunk road from two ends to a station bit line 110 of the inclined cement mixing pile machine, a slope is formed on two sides of the sunk road by construction, a soil body under a bridge of an sand bridge 100 is reserved as a pre-pressing layer in advance, the distance between the digging completion surface of the sunk road and the bottom surface of a roadbed is 50cm, underground clear water is not seen at the bottom of the digging completion surface of the station bit line 110 of the inclined cement mixing pile machine, an operation surface of 2m is guaranteed on the front operation surface of the station bit line 110 of the inclined cement mixing pile machine, and a safe and stable slope is formed by collecting the soil body in front of the operation surface of the station bit line 110 of the inclined cement mixing pile machine;
pile positions are seamlessly densely distributed on a station bit line 110 of the inclined cement mixing pile machine, pile bodies are tangentially arranged, construction is synchronously and symmetrically carried out from two sides of a bridge during operation, a horizontal central line of a lower penetrating sinking road is taken as a boundary, pile jumping construction is carried out from one side of the bridge of the sand bridge 100 to one side of a water facing surface 170, each pile position is firstly carried out vertically during construction, then the pile positions are sequentially stirred horizontally to form an improved soil layer 120, construction interval time of adjacent pile positions is less than 8 hours, and 4 gradient speed changes are carried out according to density change of repeated rotating parts during rotary spraying construction of each pile position, so that cement doping amount of the pile positions is 15% of reinforced soil amount, coring strength of the improved soil layer 120 is equal to or greater than C15, and edges of each side of the improved soil layer 120 exceed an outer wall of the sinking road by more than 20cm along the width direction.
After the improved soil layer 120 is maintained for more than 7 days, excavating a pre-compaction layer soil body which is not excavated under the bridge, making a slope protection or a short retaining wall on the side part of the bridge foundation of the sand bridge 100, and constructing the soil body in the water facing surface 170 to form an inclined waterproof curtain wall 130, wherein the waterproof curtain wall 130 is formed by double-row waterproof curtain piles, the inclination angle of the waterproof curtain wall 130 is 45 degrees and is larger than the gradient of the slope, the minimum vertical distance between the wall body of the waterproof curtain wall 130 and the uphill line of the river levee is more than 2m, and the minimum vertical distance is above the water facing surface;
after the improved soil layer 120 is maintained for more than 14 days, roadbed excavation of a sunk road is carried out, wheel type mechanical construction is adopted to excavate to a road subbase, 2% of base layers of the road subbase are used for slope finding, then drainage collecting ditches 150 are excavated along two sides of the improved soil layer 120, open rows are adopted, the drainage collecting wells are collected towards two sides of a bridge, a dewatering well is arranged at the bottom of the drainage collecting well, a square well with a reinforced concrete structure is adopted in the drainage collecting well, the internal clearance side length is 1.5m, then anti-floating anchor 140 construction is carried out in the improved soil layer 120, firstly, anti-floating anchor 140 pore forming construction is carried out in the improved soil layer 120 by using impact drills, the anti-floating anchor 140 is arranged in a pattern hole mode instead of being arranged in a 'groined' mode, the improved soil layer 120 is prevented from being broken, then the anti-floating anchor 140 is lowered by adopting a method of welding the section side, grouting is adopted, and grouting pressure reaches 1.5MPa.
The road subbase is kicked, washed clean, the C15 cushion layer concrete is used for making up and leveling to ensure the flatness of a base surface, waterproof ointment is smeared at the interface position of the reinforcing steel bars of the anti-floating anchor rods 140 and the cushion layer, the SBS waterproof asphalt waterproof coiled material construction is carried out after the ointment is smeared on the leveling layer of the road subbase to finish the waterproof layer 160 construction, and then the construction of the sinking road structural layer is carried out, namely, the ponding side ditch construction, the expansion joint construction, the road surface layer construction, the outer wall waterproof construction and the outer wall backfilling construction of the sinking road are carried out.
According to the submerged road construction method under the sand bridge, aiming at the conditions of insufficient clearance, high ground water level and soft foundation under the sand bridge, an inclined cement mixing pile machine is used for soil improvement, soft wet soil is integrally mixed and agglomerated to form an improved soil layer 120, the bearing capacity and permeability resistance of the improved soil are improved, so that the disturbance of the foundation is reduced, the feasibility of anti-floating of the anti-floating anchor 140 is enhanced, the rolling of a road roller on the roadbed is avoided, the disturbance of the bridge foundation due to excavation and rolling vibration is reduced, the influence of vibration on the bridge foundation is reduced, the cost and the complexity of a measure procedure are greatly reduced, meanwhile, the water stop curtain construction is carried out through the inclined cement mixing pile machine, the larger osmotic water pressure of the water surface 170 can be effectively reduced, the apparent drainage pressure is reduced, the occurrence probability of roof fall surge due to osmotic pressure is reduced, the side slope is consolidated, and the erosion of slope tide on the side after the construction of the soil improvement agglomeration and the submerged road structure is reduced. The sinking road construction method under the sand bridge provided by the embodiment has the advantages of simple and smooth process, improved construction efficiency, shortened construction period, saved construction cost and suitability for wide popularization and use.
The embodiments described above are some, but not all embodiments of the application. The detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (3)
1. The sinking road construction method under the sand bridge is characterized by comprising the following steps of:
measuring a laying-out and laying-out road side line, a sinking type road two-side excavation laying-out line, an inclined cement mixing pile machine station bit line, a waterproof curtain line and point positions;
the method comprises the steps that a digging machine is used in the dead water period to carry out sinking type road digging from two ends to station bit lines of the inclined cement mixing pile machine, soil under a bridge is reserved as a pre-pressing layer in advance, and a safe and stable slope is formed for slope collection of soil in front of an operation face;
pile positions are seamlessly densely distributed on the station bit line of the inclined cement mixing pile machine, so that all pile bodies are tangentially arranged, construction is synchronously and symmetrically carried out from two sides of a bridge during operation, pile jumping construction is carried out from one side of the bridge to the water facing side, each pile position is firstly carried out vertically during construction, and then an improved soil layer is formed by stirring in sequence in the horizontal direction; the construction interval time of adjacent pile positions is less than 8 hours when the pile is jumped from one side of the bridge to the water surface side, and when each pile position is subjected to rotary spraying construction, 3-4 gradient speed changes are divided according to the density change of repeated rotating parts, so that the cement doping amount of the pile position is 12-18% of the reinforced soil amount;
after maintaining the improved soil layer for more than 7 days, excavating an unexcavated soil body under the bridge, and constructing a water-facing soil body to form an inclined waterproof curtain wall; the waterproof curtain wall is formed by double piles, the inclination angle of the waterproof curtain wall is 15-75 degrees, the minimum vertical distance between the wall body of the waterproof curtain wall and the uphill line of the river levee is 2m, and the minimum vertical distance is above the river facing water level;
after maintaining the improved soil layer for more than 14 days, excavating roadbed of a sunk road, excavating to a road subbase, excavating drainage collecting ditches on two sides of the improved soil layer, and then constructing anti-floating anchors in the improved soil layer; the coring strength of the improved soil layer is larger than or equal to C15, and the edges of each side of the improved soil layer exceed the outer wall of the sinking road by 20cm;
cleaning, repairing and leveling the road subbase, and performing waterproof construction, and then performing ponding side ditch construction, expansion joint construction, road surface layer construction, outer wall waterproof construction and outer wall backfill construction of a sinking road.
2. The method for constructing a submerged road under an sand bridge according to claim 1, wherein the inclined cement mixing pile machine station line is arranged at an expansion joint of the submerged road and has a distance from the sand bridge of 3m or more.
3. The method according to claim 1, wherein when the sinking road is excavated from both ends to the station bit line of the inclined cement mixer by using the excavator, a distance between the excavation completion surface and the bottom surface of the roadbed is maintained to be a pre-pressed layer of 50cm or more, and it is ensured that no underground water is seen at the bottom of the excavation completion surface of the station bit line of the inclined cement mixer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111133073.4A CN113863076B (en) | 2021-09-27 | 2021-09-27 | Sinking road construction method under sand bridge |
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| CN202111133073.4A CN113863076B (en) | 2021-09-27 | 2021-09-27 | Sinking road construction method under sand bridge |
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| KR102588761B1 (en) * | 2023-02-13 | 2023-10-16 | (주)홍익기술단 | Clearance Measurement Device of Expansion Joint for Bridge Safety Diagnosis |
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