CN111472221A - Subgrade settlement treatment method - Google Patents
Subgrade settlement treatment method Download PDFInfo
- Publication number
- CN111472221A CN111472221A CN202010294060.4A CN202010294060A CN111472221A CN 111472221 A CN111472221 A CN 111472221A CN 202010294060 A CN202010294060 A CN 202010294060A CN 111472221 A CN111472221 A CN 111472221A
- Authority
- CN
- China
- Prior art keywords
- settlement
- subgrade
- treatment method
- subgrade settlement
- equipment
- 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
- E01C3/00—Foundations for 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
- E01C3/04—Foundations produced by soil stabilisation
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention belongs to the technical field of road construction, and particularly relates to a subgrade settlement treatment method which comprises the following steps: (1) building a roadbed slope workbench, and positioning construction equipment, wherein the construction equipment comprises drilling equipment and grouting equipment; (2) according to the subgrade settlement position, drilling holes in the subgrade side slope in the radial direction by using drilling equipment; (3) putting a settlement compensation device in the hole; (4) and injecting high-pressure slurry into the settlement compensation device through grouting equipment, expanding the volume of the settlement compensation device, jacking a settlement part, and eliminating subgrade settlement after the high-pressure slurry is solidified and the settlement compensation is finished. The core of the method is 'punching-placing the device-grouting expansion-extrusion lifting', the method is a brand new technology, changes the traditional concept of 'reinforcement', firstly proposes the concept of 'compensating' for settlement so as to counteract the settlement, simultaneously adopts a brand new air bag device for construction, and belongs to the first proposal in the related fields.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a subgrade settlement treatment method.
Background
In the process of road construction, the prevention of uneven settlement of a road is a very important work in engineering construction management, and a smooth road is an important guarantee for ensuring driving comfort and safety. In recent years, the construction progress of infrastructures such as roads and the like in China is accelerated, and the design and construction level of infrastructures such as roads and the like is improved. In order to ensure the comfort and safety of road driving, most engineering units adopt methods such as foundation reinforcement, filling materials with good performance and quality, filling process procedure optimization and the like, and a certain effect is achieved in the aspect of preventing the uneven settlement of the road, but the problem of the uneven settlement of the road is not thoroughly eliminated, and even becomes an industrial problem in the aspect of road construction quality control. In the road operated by passing through the vehicle, due to the comprehensive action of various factors such as construction quality control, construction period influence, unfavorable geological topography and the like, after a lot of roads passing through the vehicle run for a period of time, the uneven settlement of the roads occurs in different degrees, so that the top surface of the road is sunken or sunk, the smoothness and the comfort of the running vehicle are influenced more, and the severe jolt is generated when the vehicle runs through an individual road section due to the excessive uneven settlement, and the running safety is influenced seriously. At present, the settlement treatment method mainly comprises roadbed reinforcement, excavation, replacement, filling, re-paving and the like, and the treatment is carried out from the top to the bottom by starting from the road surface and closing traffic. The treatment method has the defects of low efficiency, influence on passing, enclosure construction, traffic blockage, great social negative influence and the like. How to treat the road settlement by adopting a method which has the minimum influence on the traffic under the condition of not influencing the traffic becomes a difficult problem which troubles the industry.
Disclosure of Invention
The invention aims to provide a subgrade settlement treatment method, which solves the problems of low efficiency, influence on traffic, enclosure construction, traffic blockage, great social negative influence and the like of the conventional treatment method.
The realization process of the invention is as follows:
a subgrade settlement treatment method comprises the following steps:
(1) building a roadbed slope workbench, and positioning construction equipment comprising drilling equipment and grouting equipment
Equipment;
(2) according to the subgrade settlement position, drilling holes in the subgrade side slope in the radial direction by using drilling equipment;
(3) placing a settlement compensation air bag in the hole;
(4) and injecting high-pressure slurry into the settlement compensation device through grouting equipment, expanding the volume of the settlement compensation device, jacking a settlement part, and eliminating subgrade settlement after the high-pressure slurry is solidified and the settlement compensation is finished.
Further, in the step (2), the aperture of the drilled hole ranges from 5cm to 30 cm.
Further, in the step (2), the number of the drill holes is one or more, and the number of the drill holes is determined according to the subgrade settlement height and the range.
Further, in step (3), a subside compensation gasbag is placed in every hole, subside compensation arrangement includes that one or a plurality of subsides the compensation unit, subside the compensation unit and constitute by gasbag and the slip casting pipe that sets up in the gasbag side, the one end and the gasbag side of slip casting pipe are connected, the other end of slip casting pipe is provided with the stop valve, and a plurality of gasbag subsides the area according to the road bed and puts into downtheholely, the slip casting pipe sets up the one end of stop valve and extends to outside the side slope of road bed.
Further, the material of gasbag is composite bed material, composite bed material includes a plurality of layers of PVC layer, is provided with the explosion-proof layer of ox muscle line between the adjacent two-layer PVC layer.
Further, the air bag is a cylinder.
Furthermore, the composite layer material comprises 3-5 PVC layers, and a beef tendon line explosion-proof layer is arranged between every two adjacent PVC layers.
Further, the slurry is capable of solidifying after injection.
Further, the slurry is preferably a cement slurry or a water glass slurry.
The principle of the method is that a working space of the air bag is formed by punching, the volume of the air bag is changed by pressure grouting, so that the sinking part is extruded or lifted, and the volume change of the air bag can be controlled by adjusting the amount of injected slurry due to the great flexibility of the air bag, so that the extruding and lifting effects of each hole air bag in the technology of the invention can be adjusted as long as the maximum expansion value of the air bag is not exceeded.
The invention has the following positive effects:
(1) compared with the prior art, the invention adopts the flexible air bag, the material has good elasticity, and the volume can be enlarged under the action of grouting pressure.
(2) The core of the method is 'punching-placing the device-grouting expansion-extrusion lifting', the method is a brand new technology, changes the traditional concept of 'reinforcement', firstly proposes the concept of 'compensating' for settlement so as to counteract the settlement, simultaneously adopts a brand new air bag device for construction, and belongs to the first proposal in the related fields.
(3) Compared with the technical defect that the flow direction of the grout is not controlled easily in the traditional grouting, all the grout is limited in the air bag in the method, the grout outflow and loss cannot be generated, and the volume of the air bag can be changed by all the injected grout, so that the extruding and lifting effects are very obvious.
Drawings
FIG. 1 is a schematic illustration of the process of the invention as practiced in example 1;
FIG. 2 is a schematic structural diagram of a settlement compensating unit of the settlement compensating device of the present invention;
FIG. 3 is a schematic structural diagram of a composite layer material according to the present invention;
FIG. 4 is a schematic representation of the implementation of the method of the invention described in example 2, wherein (a) is an axial cross-section of the pavement and (b) is a radial cross-section of the pavement;
FIG. 5 is a schematic representation of the implementation of the method of the invention described in example 3, wherein (a) is an axial section of the pavement and (b) is a radial section of the pavement;
FIG. 6 is a schematic representation of the implementation of the method of the invention described in example 4, wherein (a) is an axial cross-section of the pavement and (b) is a radial cross-section of the pavement;
FIG. 7 is a schematic axial cross-sectional view of a roadway during the practice of the method of the present invention as described in example 5;
in the figure, 1 air bag, 2 grouting pipes, 21 stop valves, 3PVC layers and 4 beef tendon explosion-proof layers.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention provides a subgrade settlement treatment method, aiming at solving the problems of low efficiency, influence on traffic, enclosure construction, traffic blockage, large negative social influence and the like of the existing treatment method. In the invention, the air bags 1 are cylindrical structures, the outer diameter of each air bag 1 is less than the aperture of a drilled hole at a settlement position, the pressure born by each air bag 1 is generally between 5 and 50 tons, and the specific condition is determined according to the material and the volume.
Example 1
Settlement occurs in a certain section of roadbed, as shown in figure 1 (1);
the concrete process for eliminating the subgrade settlement by the method comprises the following steps:
(1) and (3) building a roadbed slope workbench, and positioning construction equipment, wherein the construction equipment comprises drilling equipment and grouting equipment, and the drilling equipment and the grouting equipment are shown in the figure 1 (2).
(2) According to the subgrade settlement position, radial drilling is carried out on the subgrade side slope by using drilling equipment, and the drilling equipment is shown in the figure 1(3), and the figure 1(4) is shown after the drilling;
(3) placing a settlement compensating device in the hole, as shown in figure 1 (5);
(4) high-pressure cement slurry is injected into the settlement compensation device through grouting equipment, the settlement compensation device expands in volume to generate peripheral pressure to act on the roadbed, the lower part and two sides of the settlement compensation device are limited in displacement, the settlement compensation device finally expands upwards to jack up a settlement part, and the settlement is eliminated after the high-pressure cement slurry is solidified. The sedimentation amount of different parts is different, so the depth of the holes is different, the holes can be long or short, the holes can be arranged in sections, and the holes can be single-hole or multi-hole.
In the method, in the step (2), the aperture of the drilled hole is 5 cm-30 cm; and (3) determining the number of the drilled holes according to the subgrade settlement height and range, wherein the number of the drilled holes in the step (2) is one or more.
In the method, in the step (3), a settlement compensation air bag is placed in each hole, the settlement compensation device comprises one or a plurality of settlement compensation units, each settlement compensation unit consists of an air bag 1 and a grouting pipe 2 arranged on the side surface of the air bag 1, as shown in figure 2, one end of each grouting pipe 2 is connected with the side surface of the air bag 1, the other end of each grouting pipe 2 is provided with a stop valve 21, the air bags 1 are placed in the holes according to the settlement area of the roadbed, and one end of each grouting pipe 2, provided with the stop valve 21, extends out of a side slope 4 of the roadbed; the material of gasbag 1 is composite bed material, composite bed material includes a plurality of layers of PVC layer 3, is provided with ox muscle line explosion-proof layer 4 between two adjacent layers of PVC layer, sees figure 3, and every square meter in the plane 1 bearing of gasbag is 5-50 tons. The air bags 1 are cylindrical, the thickness of each air bag 1 after grouting is 1cm-25cm, and different air bags 1 are selected to be placed in the holes according to road conditions. The composite layer material comprises 3-5 PVC layers 3, and a beef tendon line explosion-proof layer 4 is arranged between every two adjacent PVC layers. The slurry of step 4 may also be a water glass slurry.
Example 2
The full-width sinking of a certain section of roadbed occurs within 10m, and the difference between the lowest sinking position and the road surface is 30 cm;
the concrete process for eliminating the subgrade settlement by the method comprises the following steps:
(1) and (4) building a roadbed slope workbench, and taking construction equipment in place, wherein the construction equipment comprises drilling equipment and grouting equipment.
(2) According to the subgrade settlement position, drilling holes in the subgrade side slope in a radial mode by using drilling equipment, wherein the depth of each hole is larger than the width of a corresponding road surface, and the holes can be drilled for construction convenience, as shown in a figure 4(b), the diameter of each hole is determined according to the descending depth of the position of a road section;
(3) putting a settlement compensation device into the hole, wherein the diameter of the settlement compensation device, namely the diameter of the air bag 1 is determined according to the descending depth of the position of the road section, a plurality of air bags 1 with different diameters can be arranged side by side, the larger the settlement is, the larger the diameter of the put air bag 1 is, and the larger the expansion amount after grouting is, as shown in fig. 4 (a);
(4) high-pressure water glass slurry is injected into the settlement compensation device through grouting equipment, the settlement compensation device expands in volume to generate peripheral pressure to act on the roadbed, the lower part and two sides of the settlement compensation device are limited in displacement, the settlement compensation device finally expands upwards to jack up a settlement part, and the settlement is eliminated after the high-pressure water glass slurry is solidified. The settling volumes of different parts are different, so the depth of the holes is different, the holes can be long or short, the holes can be arranged in sections, and the holes can be single-hole or multi-hole.
In this example, the maximum value of the bore diameter of the bore hole is 30 cm. One settlement compensating air bag is placed in each hole.
Example 3
Partial width sinking of a certain section of roadbed occurs within a certain length range;
the concrete process for eliminating the subgrade settlement by the method comprises the following steps:
(1) and (4) building a roadbed slope workbench, and taking construction equipment in place, wherein the construction equipment comprises drilling equipment and grouting equipment.
(2) According to the subgrade settlement position, drilling holes in the subgrade side slope in a radial mode by using drilling equipment, wherein the hole depth is only required to be drilled to the boundary of a settlement area, as shown in a figure 5(b), and the diameter of each hole is determined according to the descending depth of the position of a road section;
(3) putting a settlement compensation device into the hole, wherein the diameter of the settlement compensation device, namely the diameter of the air bag 1 is determined according to the descending depth of the position of the road section, a plurality of air bags 1 with different diameters can be arranged side by side, the larger the settlement is, the larger the diameter of the put air bag 1 is, and the larger the expansion amount after grouting is, as shown in fig. 5 (a);
(4) high-pressure cement slurry is injected into the settlement compensation device through grouting equipment, the settlement compensation device expands in volume to generate peripheral pressure to act on the roadbed, the lower part and two sides of the settlement compensation device are limited in displacement, the settlement compensation device finally expands upwards to jack up a settlement part, and the settlement is eliminated after the high-pressure cement slurry is solidified. The settling volumes of different parts are different, so the depth of the holes is different, the holes can be long or short, the holes can be arranged in sections, and the holes can be single-hole or multi-hole. One settlement compensating air bag is placed in each hole.
Example 4
The middle of a certain section of roadbed sinks within a certain length range;
the concrete process for eliminating the subgrade settlement by the method comprises the following steps:
(1) and (4) building a roadbed slope workbench, and taking construction equipment in place, wherein the construction equipment comprises drilling equipment and grouting equipment.
(2) According to the subgrade settlement position, drilling holes in the subgrade side slope in a radial mode by using drilling equipment, wherein the hole depth is only required to be drilled to the boundary of a settlement area, as shown in a figure 6(b), and the diameter of each hole is determined according to the descending depth of the position of a road section;
(3) placing a settlement compensation device in the hole, wherein the diameter of the settlement compensation device, namely the diameter of the air bag 1 is determined according to the descending depth of the position of the road section, and a plurality of air bags 1 with different diameters can be arranged side by side, as shown in fig. 6(a), the larger the settlement is, the larger the diameter of the placed air bag 1 is, the larger the expansion amount after grouting is, and it needs to be noted that the air bag 1 only needs to be placed below the settlement part without placing the unsettled area;
(4) high-pressure cement slurry is injected into the settlement compensation device through grouting equipment, the settlement compensation device expands in volume to generate peripheral pressure to act on the roadbed, the lower part and two sides of the settlement compensation device are limited in displacement, the settlement compensation device finally expands upwards to jack up a settlement part, and the settlement is eliminated after the high-pressure cement slurry is solidified. The settling volumes of different parts are different, so the depth of the holes is different, the holes can be long or short, the holes can be arranged in sections, and the holes can be single-hole or multi-hole. One settlement compensating air bag is placed in each hole.
Example 5
When the descent depth of a certain section of roadbed is deeper within a certain length range, multilayer punching can be adopted, and the air bags 1 are placed in the holes to realize settlement compensation of the deeper area, as shown in figure 7.
The settlement compensating device used in the method can also be provided with an anti-prick and anti-explosion layer on the outer layer of the air bag 1 in the using process, so that the road settlement compensating device is more durable. The load bearing standard of the air bag 1 is that the load bearing capacity of the air bag per square meter in a plane is 5-50 tons, namely that the load bearing capacity of the air bag per square meter in the plane area of a single air bag 1 is 5-50 tons, the plane area of the air bag 1 after grouting is the load bearing area of the upper surface, and the load bearing capacity of the air bag per square meter is 5-50 tons.
The structure of the air bag 1 is not limited in the invention, as long as the effect of the method can be realized, the rectangular shape or other shapes can be selected, and the construction method of drilling from the side slope of the road, placing the air bag 1, grouting, expanding and eliminating settlement is the protection point of the invention.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A subgrade settlement treatment method is characterized by comprising the following steps:
(1) building a roadbed slope workbench, and positioning construction equipment, wherein the construction equipment comprises drilling equipment and grouting equipment;
(2) according to the subgrade settlement position, drilling holes in the subgrade side slope in the radial direction by using drilling equipment;
(3) placing a settlement compensation air bag in the hole;
(4) and injecting high-pressure slurry into the settlement compensation device through grouting equipment, expanding the volume of the settlement compensation device, jacking a settlement part, and eliminating subgrade settlement after the high-pressure slurry is solidified and the settlement compensation is finished.
2. The subgrade settlement treatment method according to claim 1, characterized in that: in the step (2), the aperture of the drilled hole ranges from 5cm to 30 cm.
3. The subgrade settlement treatment method according to claim 1, characterized in that: in the step (2), the number of the drilled holes is one or more, and the number of the drilled holes is determined according to the subgrade settlement height and the subgrade settlement range.
4. The subgrade settlement treatment method according to claim 1, characterized in that: in step (3), a subside compensation gasbag is placed in every downthehole, subside compensation arrangement includes that one or a plurality of subsides the compensation unit, subside the compensation unit and constitute at slip casting pipe (2) of gasbag (1) side by gasbag (1) and setting, the one end and the gasbag (1) side of slip casting pipe (2) are connected, the other end of slip casting pipe (2) is provided with stop valve (21), and a plurality of gasbag (1) subsides the area according to the road bed and puts into downtheholely, slip casting pipe (2) set up the one end of stop valve (21) and extend to outside the side slope (4) of road bed.
5. The subgrade settlement treatment method according to claim 4, characterized in that: the material of gasbag (1) is composite bed material, composite bed material includes a plurality of layers of PVC layer (3), is provided with ox muscle line explosion-proof layer (4) between the adjacent two-layer PVC layer.
6. The subgrade settlement treatment method according to claim 4, characterized in that: the air bag (1) is a cylinder.
7. The subgrade settlement treatment method according to claim 4, characterized in that: the composite layer material comprises 3-5 PVC layers (3), and a beef tendon line explosion-proof layer (4) is arranged between every two adjacent PVC layers.
8. The subgrade settlement treatment method according to claim 1, characterized in that: and (4) the slurry in the step (4) is capable of solidifying after injection.
9. The subgrade settlement treatment method according to claim 8, characterized in that: the slurry is preferably a cement slurry or a water glass slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010294060.4A CN111472221A (en) | 2020-04-15 | 2020-04-15 | Subgrade settlement treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010294060.4A CN111472221A (en) | 2020-04-15 | 2020-04-15 | Subgrade settlement treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111472221A true CN111472221A (en) | 2020-07-31 |
Family
ID=71752047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010294060.4A Pending CN111472221A (en) | 2020-04-15 | 2020-04-15 | Subgrade settlement treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111472221A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235340A (en) * | 2021-04-09 | 2021-08-10 | 浙江工业大学 | Method for treating bump at bridge head by expanding and jacking transverse lead hole |
| CN114855523A (en) * | 2022-06-10 | 2022-08-05 | 温州市市政管理中心 | Lifting and reinforcing device and method for subgrade settlement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322008A (en) * | 2011-07-13 | 2012-01-18 | 华南理工大学 | Compensation method for roadbed settlement |
| CN103981782A (en) * | 2014-05-30 | 2014-08-13 | 中交第二公路勘察设计研究院有限公司 | Method and structure for reinforcing flat hole grouting roadbed without damaging road surface |
| CN104328782A (en) * | 2014-11-27 | 2015-02-04 | 北京中铁润海科技有限公司 | Expansive pouring device and method for governing railway roadbed sedimentation and deformation |
| CN105862874A (en) * | 2016-04-14 | 2016-08-17 | 浙江科技学院 | Protection method for controlling deformation of building structure close to foundation pit |
| CN108642975A (en) * | 2018-03-08 | 2018-10-12 | 中国铁路设计集团有限公司 | A method of for being lifted Settlement diseases railway bed |
-
2020
- 2020-04-15 CN CN202010294060.4A patent/CN111472221A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322008A (en) * | 2011-07-13 | 2012-01-18 | 华南理工大学 | Compensation method for roadbed settlement |
| CN103981782A (en) * | 2014-05-30 | 2014-08-13 | 中交第二公路勘察设计研究院有限公司 | Method and structure for reinforcing flat hole grouting roadbed without damaging road surface |
| CN104328782A (en) * | 2014-11-27 | 2015-02-04 | 北京中铁润海科技有限公司 | Expansive pouring device and method for governing railway roadbed sedimentation and deformation |
| CN105862874A (en) * | 2016-04-14 | 2016-08-17 | 浙江科技学院 | Protection method for controlling deformation of building structure close to foundation pit |
| CN108642975A (en) * | 2018-03-08 | 2018-10-12 | 中国铁路设计集团有限公司 | A method of for being lifted Settlement diseases railway bed |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235340A (en) * | 2021-04-09 | 2021-08-10 | 浙江工业大学 | Method for treating bump at bridge head by expanding and jacking transverse lead hole |
| CN113235340B (en) * | 2021-04-09 | 2022-06-17 | 浙江工业大学 | Method for treating bump at bridge head by expanding and jacking transverse lead hole |
| CN114855523A (en) * | 2022-06-10 | 2022-08-05 | 温州市市政管理中心 | Lifting and reinforcing device and method for subgrade settlement |
| CN114855523B (en) * | 2022-06-10 | 2024-06-04 | 温州市市政管理中心 | Lifting and reinforcing device and method for roadbed settlement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112554177B (en) | Construction method of ultra-long small-diameter cast-in-situ bored pile | |
| CN107190762B (en) | Pile foundation structure for reducing side friction resistance | |
| CN111472221A (en) | Subgrade settlement treatment method | |
| CN110644539B (en) | Active seepage-proofing control method for subway station structure seepage diseases and underground seepage-proofing body | |
| CN110144767B (en) | Side-width roadbed structure and construction method | |
| CN108222221A (en) | A kind of maintenance process for municipal blow-off pipe | |
| CN110629594A (en) | Large-adjustment-quantity plate type ballastless track and height adjustment method thereof | |
| CN113235340B (en) | Method for treating bump at bridge head by expanding and jacking transverse lead hole | |
| CN109371763B (en) | Construction method of high-groundwater-level low-filling shallow-excavation expansive soil subgrade | |
| CN106677157A (en) | Construction technology for deep soft foundation treatment | |
| CN103556551B (en) | Reinforce the construction method of the dumb-bell shape drilled pile composite foundation structure of embankment widening | |
| CN108642975A (en) | A method of for being lifted Settlement diseases railway bed | |
| CN209556935U (en) | A kind of soft soil foundation rotary drilling rig job platform | |
| CN111764378A (en) | Drilling and wall protecting method, pouring method and pouring structure for flow-plastic sludge layer | |
| CN215714290U (en) | Construction structure for settling, lifting and rectifying ballastless track | |
| CN109356530A (en) | A kind of soft soil foundation rotary drilling rig job platform and application method | |
| CN210946334U (en) | Soft foundation reinforcement and butt strap jacking repair system for sunk bridge head butt strap | |
| CN213014258U (en) | Drilling and filling structure for flow-plastic sludge layer | |
| CN114704269A (en) | Pipe jacking method construction method for composite stratum with upper soft layer and lower hard layer | |
| CN211006164U (en) | Large-adjustment-quantity plate type ballastless track | |
| CN103556555A (en) | Nail-shaped bored pile compound foundation structure for reinforcing embankment soft foundation, and construction method thereof | |
| CN106812148A (en) | A kind of open caisson construction technique | |
| CN111622280A (en) | Method for correcting pile foundation offset through high-pressure grouting | |
| CN205839746U (en) | Existing line overpass bored pile construction system | |
| CN113404009B (en) | Novel concrete panel structure of rock-fill dam and construction method |
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: 20200731 |