CN111119195A - Foundation pit soil nail shotcrete support construction method - Google Patents
Foundation pit soil nail shotcrete support construction method Download PDFInfo
- Publication number
- CN111119195A CN111119195A CN201911412178.6A CN201911412178A CN111119195A CN 111119195 A CN111119195 A CN 111119195A CN 201911412178 A CN201911412178 A CN 201911412178A CN 111119195 A CN111119195 A CN 111119195A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- soil
- slope
- concrete
- construction method
- 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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention is suitable for the technical field of foundation pit engineering of buildings, and provides a foundation pit soil nail shotcrete anchor support construction method, which comprises the following steps: s1, excavating and repairing the slope of the earthwork of the foundation pit site; s2, carrying out hole forming treatment on the excavated and repaired foundation pit; s3, carrying out soil nailing manufacturing on the foundation pit subjected to the hole forming treatment and filling the foundation pit into the punched hole; s4, grouting the hole; s5, manufacturing a reinforcing mesh; s6, spraying a concrete layer; and S7, arranging a drainage system for the foundation pit. The construction period is short. The soil nail shotcrete support is much faster than other supports, and some supports can even shorten the construction period by more than half. The manufacturing cost is low. Compared with other supports such as soil nails, cast-in-place piles and the like in China, the construction cost can be saved by 1/3-2/3. Has strong adaptability to fields and soil bodies. Is stable and reliable. The construction of the soil nail spray anchor support adopts the support while digging soil, and the length and the distance of the soil nails can be modified according to the soil quality condition discovered by the field digging and the soil deformation data monitored on the field.
Description
Technical Field
The invention belongs to the technical field of building foundation pit engineering, and particularly relates to a foundation pit soil nail shotcrete anchor support construction method.
Background
The soil nail spraying anchor support is one new soil retaining technology for soil excavation and slope stabilization, and has soil nails in dense interval as main stress member and soil nail, reinforcing net, concrete and deep foundation pit slope soil to form integral and stable soil.
The common foundation pit supporting forms mainly comprise ⒈ row pile supporting, pile supports, pile anchors and row pile cantilevers, ⒉ underground continuous wall supporting, underground continuous walls and supports, ⒊ cement retaining walls, 4 steel sheet piles (1) steel sheet pile transverse baffle supporting, steel sheet pile (1) supporting, ⒌ soil nailing walls (jet anchor supporting), ⒍ reverse arch walls, ⒎ undisturbed soil slope supporting, ⒏ foundation pit piles, ⒐ piles and wall supporting systems, 10 simple horizontal supporting, 11 steel bar row piles, 12 foundation pit reinforced concrete and the like, wherein the two or more than two modes are reasonably combined.
The large foundation pit exceeding a certain depth in the south soft soil area mostly adopts a supporting form of a diaphragm wall or a fender pile and a concrete inner support, and the supporting method has higher manufacturing cost. And for the foundation pit engineering construction in the open area of the adjacent wetland and the peripheral field, the more economic slope-releasing excavation supporting form can be selected. For the geological condition that the surface layer is 6-8 m and the plastic-flow-shaped filling soft soil widely exists, even if the slope body is locally reinforced in advance and the slope is released by adopting a large slope ratio (usually 1: 3-1: 5), the slope body is still difficult to stabilize and cannot form a slope. Therefore, the supporting mode can be changed or more conservative reinforcement measures can be adopted to change the safety and stability of the foundation pit engineering. How to overcome the condition of soft stratum of the flowing plastic filling soil, adopt a smaller slope to carry out excavation and support, and ensure that the temporary side slope is kept stable in the period before the structure is finished and the earthwork is backfilled, which is a difficult problem to be solved in the foundation pit engineering.
Disclosure of Invention
The invention aims to provide a foundation pit soil nail shotcrete support construction method, which aims to solve the technical problem of stability of a foundation pit slope by adopting a small-slope excavation slope supporting under the condition of a soft stratum of flowing plastic filling soil.
The invention is realized in this way, a foundation pit soil nail shotcrete anchor support construction method, the foundation pit soil nail shotcrete anchor support construction method includes the following steps:
s1, excavating and repairing the slope of the earthwork of the foundation pit site;
s2, carrying out hole forming treatment on the excavated and repaired foundation pit;
s3, carrying out soil nailing manufacturing on the foundation pit subjected to the hole forming treatment and filling the foundation pit into the punched hole;
s4, grouting the hole;
s5, manufacturing a reinforcing mesh;
s6, spraying a concrete layer;
and S7, arranging a drainage system for the foundation pit.
The further technical scheme of the invention is as follows: the step S1 further includes the following steps:
s11, carrying out earthwork excavation according to the measured paying-off and layered excavation depths, and leaving a soil layer with the thickness of 200-300 mm away from the side line of the foundation pit for artificial excavation and slope repairing;
s12, the front width of foundation pit excavation depends on the allowable deformation range of the side slope, the longest time for not collapsing and the mutual connection surface in the construction process;
s13, manufacturing drain holes on the side slope of the foundation pit;
and S14, performing collapse prevention treatment on the foundation pit slope.
The further technical scheme of the invention is as follows: the step S14 further includes the following steps:
s141, spraying a layer of concrete on the trimmed side slope, and drilling after the concrete is condensed;
and S142, making the side slope on the working surface into a slope to keep stable, and clearing the slope after drilling and setting soil nails.
The further technical scheme of the invention is as follows: in the step S2, after the hole is drilled, the hole cleaning check is performed, and the local water collapse or falling loose soil occurring in the hole should be immediately processed.
The further technical scheme of the invention is as follows: in the step S3, centering metal supports are arranged on the soil nails along the nail length of about 2-3 m, and ship-shaped iron sheets are arranged below the supports.
The further technical scheme of the invention is as follows: in the step S4, gravity or low-pressure grouting is performed on the hole inclined downward, the grout must be continuously injected once before initial setting, and the grout is replenished once after half an hour after the grout is injected for the first time.
The further technical scheme of the invention is as follows: in the step S5, the soil nail heads can be directly welded on the reinforcing steel bar net of the concrete surface layer through the # -shaped reinforcing steel bars, the soil nail heads are connected with the concrete through nuts and metal backing plates, and the size of the backing plates is 200 × 8-300 × 10 mm.
The further technical scheme of the invention is as follows: before the concrete is sprayed in the step S6, the steel bar meshes should be laid and connected for inspection, and when the concrete is sprayed, the spray head and the sprayed surface should be kept vertical and keep a distance of 0.8-1.5 m.
The further technical scheme of the invention is as follows: and S7, the ground surface in the supporting range around the foundation pit is laid down, and a concrete ground is constructed by matching with slope supporting, wherein the drainage gradient is 3-5%.
The invention has the beneficial effects that: the construction period is short. The soil nail shotcrete support is much faster than other supports, and some supports can even shorten the construction period by more than half. The manufacturing cost is low. Compared with other supports such as soil nails, cast-in-place piles and the like in China, the construction cost can be saved by 1/3-2/3. Has strong adaptability to fields and soil bodies. Is stable and reliable. The construction of the soil nail spray anchor support adopts the support while digging soil, and the length and the distance of the soil nails can be modified according to the soil property condition discovered by the field digging and the soil deformation data monitored on the field, and once the unfavorable condition occurs, measures can be taken in time.
Drawings
Fig. 1 is a flowchart of a foundation pit soil nailing, shotcreting and bolting construction method according to an embodiment of the present invention.
Fig. 2 is a flow chart of a soil nailing and bolting construction process provided by the embodiment of the invention.
Fig. 3 is a welding view of the # -shaped reinforcing steel bars and the soil nails provided by the embodiment of the invention.
Fig. 4 is a schematic diagram of a slope top water prevention and drainage device provided by the embodiment of the invention.
Detailed Description
The concrete slurry is sprayed by a concrete spraying anchor machine after the reinforcing mesh is hung through the slender metal rods arranged in the soil body at close intervals. The soil nail contacts with the surrounding soil body along the full length, and forms a combination body with the surrounding soil body by depending on the cohesive force or friction force of the contact interface soil, the soil body is passively stressed under the condition that the soil body is deformed, the soil body is reinforced mainly by pulling, the stress of the soil nail is uneven along the length, the middle is large generally, and the two ends are small, so that a soil spraying and coagulating surface layer in the soil nail support does not belong to a main stress part, and the soil nail support has the main function of stabilizing the local soil body on the excavation surface and preventing the local soil body from collapsing and being corroded by rainwater.
5.1 preparation of construction
Acceptance at construction site
(1) And (3) checking and accepting the removal of the on-site obstacles including underground and overhead pipelines and the like, and mastering site conditions such as underground pipelines and the like.
(2) And (4) measuring and setting a field positioning axis, an elevation pile and a side line of the foundation pit.
(3) And (4) checking and accepting the tee joint.
Construction site arrangement
And reasonably planning construction machinery, material stacking and the like according to the site around the foundation pit, the construction process and the process requirements.
(1) Reinforcing bar processing area
(2) Cement, sand and stone area
Stock preparation
(1) And selecting the steel bar meshes according to the expert demonstration scheme.
(2) The cement is P.O.42.5R ordinary portland cement.
(3) The medium coarse sand is selected, and the mud content meets the concrete construction standard requirement.
(4) The particle size of the stones is below 12 mm.
As shown in fig. 1-4, the construction method of the foundation pit soil nailing, shotcreting and bolting support provided by the invention is represented by the following flow chart:
step S1, excavating and repairing the slope of the earthwork of the foundation pit site; (1) and carrying out earth excavation according to the measurement paying-off and the layered excavation depth. When mechanical excavation is adopted, a soil layer with the thickness of 200-300 mm from the designed side line of the foundation pit is left, and manual excavation is utilized to repair the slope. The size of the slope angle and the flatness of the slope surface meet the design requirements. When each section is excavated, the excavation is strictly carried out according to the excavation depth, and the over excavation is strictly forbidden.
(2) The front width of the foundation pit excavation should be determined according to the allowable deformation range of the side slope, the longest time of non-collapse and the mutual connection surface of the construction process. Good ground condition, less water content, fast construction speed, larger width, and smaller width otherwise.
(3) When a water seepage or water seepage soil layer exists on the side slope of the foundation pit, a drain hole is needed, the aperture is about 50-100 mm, the hole depth is determined according to the situation, and the shallow drainage pipe and the deep drainage system can be generally used. Corresponding pipes are inserted into the holes, water seepage holes are drilled on the pipe wall, water filtering materials are filled in the holes, and the water drainage gradient can be 5-10 mm.
(4) In order to prevent the foundation pit side slope from collapsing, the following measures can be adopted for the poor soil body: (a) spraying a layer of concrete on the trimmed side slope, and drilling after the concrete is condensed: (b) the slope on the working face is made into a slope to be kept stable, and the slope is cleared after the hole is drilled and the soil nail is arranged.
Step S2, carrying out hole forming treatment on the foundation pit which is excavated and repaired; (1) the drilling is divided into manual drilling and mechanical drilling. Before drilling, hole positions are determined according to the requirements of the demonstration scheme, marked and numbered, the allowable deviation of the hole positions is not more than 100mm, and the allowable error of the hole depth is not more than 50 mm. The error of the inclination angle of the formed hole is not more than +/-1.5 degrees.
(2) After drilling, hole cleaning inspection is carried out, and local water seepage and collapse or falling loose soil in the hole should be immediately treated.
(3) The soil body characteristics taken out in the pore-forming process are recorded one by one according to the soil nail serial numbers and are timely compared with the soil body determined in the primary design, and the design parameters of the soil nails are timely modified when a large deviation is found.
Step S3, carrying out soil nailing manufacturing on the foundation pit subjected to the hole forming treatment and filling the foundation pit into the punched hole; (1) and (5) cutting the length according to the design requirement after the steel bar is straightened.
(2) The soil nail should set up centering support along nail length 2 ~ 3m about, and the support can be made by metal, establishes the ship shape iron sheet below the support.
(3) Along the drilling axis, push the hand hole gently with soil nail and reach the design position, promote the in-process, surely do not rotate soil nail and prevent bad pore wall of slope.
(4) And after the soil nails are pushed into the holes, immediately checking whether the holes are blocked by soil crumbles, and if the holes are found, immediately cleaning.
Step S4, grouting the hole; (1) for holes inclined downwards, gravity or low-pressure grouting is adopted. The grouting pipe is slowly pulled out along with grouting, but the end of the grouting pipe is always immersed in the grouting liquid.
(2) For the horizontal or upward angle-increasing holes, the grouting pipe and the exhaust pipe are left in the holes and are not pulled out. Before grouting, the hole needs to be blocked and sealed.
(3) The grout must be continuously injected once before initial setting, and after the grout is injected for the first time, the grout can be supplemented once after half an hour, if the grout is seriously infiltrated, the grout can be supplemented for two to three times.
(4) The pressure of the pressure grouting should be controlled to be 0.5-1 MPa.
(5) In order to increase the workability of the slurry and the early strength of cement mortar, a proper amount of water reducing agent and early strength agent can be mixed into the slurry: in order to prevent the cement mortar from solidifying and shrinking, thereby causing the loss of anchoring force between an anchoring body and a hole wall, a proper amount of expanding agent can be doped into the slurry.
Step S5, manufacturing a reinforcing mesh; (1) the reinforcing mesh is formed by binding 6mm hot rolled round steel, and the size of the reinforcing mesh is 200 x 200 mm.
(2) The distance between the reinforcing mesh and the slope is not less than 50 mm.
(3) The soil nail head can be directly welded on the reinforcing mesh of the concrete surface layer through the # -shaped reinforcing steel bars, as shown in figure 3. The soil nail head can also be connected with concrete through a nut and a metal backing plate, and the size of the backing plate is 200 × 8-300 × 10 mm.
Step S6, spraying a concrete layer; (1) before spraying concrete, the steel bar net sheets are laid and connected for inspection, the sprayed surface is cleaned, the mark for controlling the thickness of the sprayed layer is embedded, and mechanical equipment, wind and water pipelines and circuits are comprehensively inspected and run in a trial mode.
(2) The sprayed concrete should be sequentially carried out in sections and fragments, the spraying sequence in the same section should be from bottom to top, and the thickness of the sprayed concrete for one time should be as follows:
and (3) mixing an accelerator: 70-100 mm
No accelerator is doped: 50-70 mm
(3) When the concrete is sprayed, the spray head and the sprayed surface are kept vertical and keep a distance of 0.8-1.5 m. The spraying hand should control the water-cement ratio well, keep the surface of the concrete smooth, and keep the surface in a moist and glossy state without dry spots or slip flow.
(4) When spraying in layers, the spraying of the later layer should be carried out after the final setting of the concrete of the former layer. When the concrete spraying operation is continued, the floating slurry layer and loose debris at the joint of the construction joint are removed, and water is sprayed for moistening.
(5) And after the sprayed concrete is finally set for two hours, spraying water for curing, wherein the curing time is not less than 7 days generally.
And step S7, a drainage system is arranged on the foundation pit. (1) The ground surface in the supporting range around the foundation pit is laid down and matched with the slope support to construct the concrete ground. The drainage gradient is 3-5% to prevent surface water from permeating underground. (2) After the foundation pit is dug to the designed depth, a drainage ditch and a water collection pit are arranged at the bottom of the foundation pit, the distance between the drainage ditch and the side wall is not less than 0.5m, the drainage ditch and the water collection pit are suitable for being bricked and coated with mortar, and water collected in the pit is drained in time.
8. Construction monitoring
The method is characterized in that the support deformation and ground crack observation are carried out all the time in the construction process, the deformation and crack conditions of the adjacent buildings need to be closely monitored, and the soil body and soil nails need to be monitored for stress strain under certain conditions.
(1) Observation of deformation
The deformation observation comprises the observation of horizontal displacement and vertical settlement of the slope soil body and the adjacent buildings. The observation precision can be divided into two types of leveling measurement, namely second-class leveling measurement and third-class leveling measurement according to the importance degree of a site, a leveling instrument and a theodolite or laser positioning measurement can be generally used, the instrument can meet the corresponding precision requirement, a measuring point can be selected at the position with the largest deformation or the most adverse local geological condition, and the deformation conditions of the side slope soil body and the adjacent buildings can be comprehensively reflected.
The ratio of the lateral displacement of the top of the foundation pit to the excavation depth meets the following requirements:
0.3 percent of sandy land
0.3 to 0.5 percent of clay
0.5 to 1 percent of soft soil
When the distance between the building near the foundation pit and the edge of the foundation pit is less than 1.5H, the surface angle displacement of the foundation pit still meets the following requirements:
the ground has 0.3 percent of reinforced concrete frame structure
The ground has a mixed structure of 0.2 percent
(2) Crack observation
If the occurrence of cracks is found in visual inspection, the times of deformation observation are increased, and marks are immediately set for observing the change of the cracks. One of the markers may be placed at the maximum opening of the fracture and the other at the end of the fracture. In general, it can be considered normal that a fine crack occurs in the ground surface and a slight crack occurs in a finishing layer of a general building adjacent to the foundation pit. When the crack develops and extends, the original construction process must be stopped, the support parameters are modified and the reinforcement is carried out in time.
For the deep foundation pit supporting structure, different supporting structure engineering costs are in turn from high to low in sequence: underground continuous wall-slope protection pile-soil nail support. Because China does not have related quota and corresponding expense standard of the soil nail foundation pit supporting construction at present, the engineering construction cost is mainly determined by a contracting unit and a contracting unit according to market price negotiation, and each region is slightly different according to the local actual condition. Generally, the cost of the soil nail supporting engineering can be generally 70-90% of that of the slope protection pile according to different geological conditions, excavation depths of foundation pits and construction schemes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A foundation pit soil nail spray anchor support construction method is characterized by comprising the following steps:
s1, excavating and repairing the slope of the earthwork of the foundation pit site;
s2, carrying out hole forming treatment on the excavated and repaired foundation pit;
s3, carrying out soil nailing manufacturing on the foundation pit subjected to the hole forming treatment and filling the foundation pit into the punched hole;
s4, grouting the hole;
s5, manufacturing a reinforcing mesh;
s6, spraying a concrete layer;
and S7, arranging a drainage system for the foundation pit.
2. The foundation pit soil nailing, bolting and supporting construction method according to claim 1, wherein said step S1 further comprises the steps of:
s11, carrying out earthwork excavation according to the measured paying-off and layered excavation depths, and leaving a soil layer with the thickness of 200-300 mm away from the side line of the foundation pit for artificial excavation and slope repairing;
s12, the front width of foundation pit excavation depends on the allowable deformation range of the side slope, the longest time for not collapsing and the mutual connection surface in the construction process;
s13, manufacturing drain holes on the side slope of the foundation pit;
and S14, performing collapse prevention treatment on the foundation pit slope.
3. The foundation pit soil nailing, bolting and supporting construction method according to claim 2, wherein said step S14 further comprises the steps of:
s141, spraying a layer of concrete on the trimmed side slope, and drilling after the concrete is condensed;
and S142, making the side slope on the working surface into a slope to keep stable, and clearing the slope after drilling and setting soil nails.
4. The method of claim 3, wherein the step S2 is performed by cleaning the hole after drilling, and the local water collapse or falling loose soil in the hole is treated immediately.
5. The foundation pit soil nail shotcrete support construction method according to claim 4, wherein in the step S3, the soil nails are provided with centering metal brackets along the nail length of about 2-3 m, and a ship-shaped iron sheet is arranged below the brackets.
6. The method of claim 5, wherein the downward inclined holes are grouted by gravity or low pressure in step S4, the grout is continuously poured before initial setting, and the grout is replenished after half an hour after the first grouting.
7. The foundation pit soil nail jet-anchor support construction method according to claim 6, wherein in the step S5, the soil nail head can be directly welded on the steel bar mesh of the concrete surface layer through a # -shaped steel bar, the soil nail head is connected with the concrete through a nut and a metal backing plate, and the size of the backing plate is 200 × 8-300 × 10 mm.
8. The foundation pit soil nailing, shotcreting, anchoring and supporting construction method according to claim 7, wherein before the concrete is sprayed in step S6, the laying and connection of the reinforcing mesh should be checked, and when the concrete is sprayed, the spray head should be kept perpendicular to the sprayed surface and kept at a distance of 0.8-1.5 m.
9. The foundation pit soil nail shotcrete support construction method according to claim 7, wherein the ground surface within the support range around the foundation pit in the step S7 should be rested, a concrete ground is constructed by cooperating with a side slope support, and the drainage gradient is 3-5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412178.6A CN111119195A (en) | 2019-12-31 | 2019-12-31 | Foundation pit soil nail shotcrete support construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412178.6A CN111119195A (en) | 2019-12-31 | 2019-12-31 | Foundation pit soil nail shotcrete support construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111119195A true CN111119195A (en) | 2020-05-08 |
Family
ID=70506387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911412178.6A Pending CN111119195A (en) | 2019-12-31 | 2019-12-31 | Foundation pit soil nail shotcrete support construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111119195A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281857A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Deep foundation pit excavation construction method |
| CN112609703A (en) * | 2020-12-03 | 2021-04-06 | 中交二公局萌兴工程有限公司 | Construction process for supporting soil nailing wall |
| CN114606940A (en) * | 2022-03-30 | 2022-06-10 | 山西路桥第七工程有限公司 | Soil nailing wall ecological frame protection structure at soil adverse side slope and construction process thereof |
| CN115288156A (en) * | 2022-08-24 | 2022-11-04 | 中国十七冶集团有限公司 | Slope protection soil consolidation construction process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122132A (en) * | 2007-09-03 | 2008-02-13 | 中铁建设集团有限公司 | Demountable composite material face plate brad supporting system |
| CN101748741A (en) * | 2009-12-18 | 2010-06-23 | 中冶交通工程技术有限公司 | Construction method of concrete supporting structure |
| KR20130095153A (en) * | 2012-02-17 | 2013-08-27 | 양영훈 | A removable prestressing steel pipe soil nailing structure |
-
2019
- 2019-12-31 CN CN201911412178.6A patent/CN111119195A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122132A (en) * | 2007-09-03 | 2008-02-13 | 中铁建设集团有限公司 | Demountable composite material face plate brad supporting system |
| CN101748741A (en) * | 2009-12-18 | 2010-06-23 | 中冶交通工程技术有限公司 | Construction method of concrete supporting structure |
| KR20130095153A (en) * | 2012-02-17 | 2013-08-27 | 양영훈 | A removable prestressing steel pipe soil nailing structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281857A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Deep foundation pit excavation construction method |
| CN112609703A (en) * | 2020-12-03 | 2021-04-06 | 中交二公局萌兴工程有限公司 | Construction process for supporting soil nailing wall |
| CN114606940A (en) * | 2022-03-30 | 2022-06-10 | 山西路桥第七工程有限公司 | Soil nailing wall ecological frame protection structure at soil adverse side slope and construction process thereof |
| CN115288156A (en) * | 2022-08-24 | 2022-11-04 | 中国十七冶集团有限公司 | Slope protection soil consolidation construction process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108442382B (en) | In-situ protection and enclosure soil-retaining structure for pressure pipeline crossing deep foundation pit and construction method | |
| CN111119195A (en) | Foundation pit soil nail shotcrete support construction method | |
| CN108842819B (en) | Urban rail transit cable line tunnel construction method | |
| CN106958256A (en) | A kind of placement layer by layer, the open caisson construction technique repeatedly sunk | |
| CN108517877B (en) | Supporting construction method combining consolidation grouting of hybrid filling ultra-deep foundation pit with double-row steel pipe piles | |
| CN107542108A (en) | A kind of reverse construction method of building basement structure | |
| CN107447778A (en) | The heightening and consolidation structure and method of a kind of in-service reinforced concrete retaining wall | |
| CN104831734A (en) | Construction method of jet-grouting pile and composite soil-nailed wall support for deep foundation pit construction | |
| CN107489164A (en) | The heightening and consolidation structure and method of a kind of in-service reinforced concrete retaining wall | |
| WO2023077552A1 (en) | Construction method for foundation pit enclosure and earth excavation | |
| CN110952586A (en) | Construction process for bearing platform below expressway | |
| CN207331740U (en) | A kind of heightening and consolidation structure of in-service reinforced concrete retaining wall | |
| CN112609703A (en) | Construction process for supporting soil nailing wall | |
| CN207331739U (en) | A kind of heightening and consolidation structure of in-service reinforced concrete retaining wall | |
| CN112695763A (en) | Deep sludge stratum foundation pit excavation method | |
| CN109706952A (en) | Large-scale well-sinking construction method | |
| CN110512594B (en) | Simple method for forming hole and pile in cavity of rotary drilling rig | |
| CN113550764A (en) | Method for starting shield concrete sleeve to enter hole and building structure | |
| CN114232602A (en) | Underground continuous pile construction process | |
| CN114293600A (en) | Method for processing broken pile defect of precast pile in weak soil area | |
| CN113266019A (en) | Construction method of foundation pit steel pipe support system | |
| CN112176944A (en) | Construction method of hydrophilic platform revetment structure | |
| Feng et al. | Discussion on construction technology of deep foundation pit support in construction engineering | |
| CN114753231B (en) | Frame beam lattice bridge structure crossing underground pipeline and construction method thereof | |
| CN220266625U (en) | Grouting piece stone retaining wall body grouting reinforcement structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200508 |
|
| RJ01 | Rejection of invention patent application after publication |