CN114411692B - Deformation control device and control method for foundation pit soil body - Google Patents
Deformation control device and control method for foundation pit soil body Download PDFInfo
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- CN114411692B CN114411692B CN202210153886.8A CN202210153886A CN114411692B CN 114411692 B CN114411692 B CN 114411692B CN 202210153886 A CN202210153886 A CN 202210153886A CN 114411692 B CN114411692 B CN 114411692B
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- grouting
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- grouting pipe
- soil body
- foundation pit
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- 239000002689 soil Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract 2
- 239000002002 slurry Substances 0.000 claims description 47
- 239000004568 cement Substances 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000005553 drilling Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 239000004744 fabric Substances 0.000 claims description 10
- 230000035515 penetration Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 description 24
- 239000007788 liquid Substances 0.000 description 15
- 239000011440 grout Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000000429 assembly Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a deformation control device for foundation pit soil body, which comprises a grouting pipe and a plurality of grouting components, wherein the grouting pipe is used for being buried in the soil body, the grouting components are arranged on the grouting pipe, the top of the grouting pipe is communicated with a grouting pump, the grouting components comprise a grouting bag which is hollow in the inside and is arranged in a sealing manner, the grouting pipe penetrates through the grouting bag and is fixedly connected with the grouting bag, and the grouting pipe is communicated with the inner cavity of the grouting bag. The method has the advantage of being capable of recovering and compensating the deformed soil body.
Description
Technical Field
The invention relates to the technical field of soil deformation control, in particular to a foundation pit soil deformation control device and a foundation pit soil deformation control method.
Background
Along with the acceleration of urban construction, the infrastructure of China enters a construction peak period, foundation pit excavation is involved in most construction engineering projects, and the foundation pit excavation often causes the change of surrounding soil stress fields so as to generate soil displacement, thereby adversely affecting surrounding buildings.
In order to solve the problem that the soil body deforms and displaces, a constructor usually drills holes around the foundation pit and embeds a grouting pipe, and then fills cement paste into the grouting pipe so as to control the deformation of the surrounding environment.
With respect to the related art in the above, the inventors consider that there are the following drawbacks: after cement grout is injected into the grouting pipe and the cement grout is solidified, a columnar pile body is formed, and although the pile body can limit the soil body around a building to further deform, the deformation of the soil body can not be compensated and recovered, so that obvious defects exist.
Disclosure of Invention
In order to solve the problem that compensation and recovery are difficult to be carried out on deformation of soil bodies around buildings, the application provides a deformation control device for foundation pit soil bodies.
In a first aspect, the present application provides a deformation control device for foundation pit soil body, which adopts the following technical scheme:
the utility model provides a deformation control device of foundation ditch soil body, is including being used for burying the slip casting pipe and setting up in the soil body a plurality of slip casting subassemblies on the slip casting pipe, the top intercommunication of slip casting pipe has the slip casting pump, the slip casting subassembly includes inside cavity and the sealed thick liquid bag that sets up, the slip casting pipe passes thick liquid bag and rather than fixed connection, the slip casting pipe with the inner chamber of thick liquid bag communicates with each other.
By adopting the technical scheme, the grouting pump injects cement slurry into the grouting bag through the grouting pipe, the grouting bag is expanded, so that a reaction force is applied to the soil body, and the deformation of the soil body around the building can be recovered by the acting force of the grouting bag.
Optionally, the slurry bags are arranged in a plurality from inside to outside, the grouting pipe is provided with a three-way valve for injecting cement slurry into the grouting pipe at the position corresponding to each slurry bag, and the three-way valve is electrically connected with a control system.
Through adopting above-mentioned technical scheme, under control system's control, open the three-way valve that corresponds the thick liquid bag, close the three-way valve that other thick liquid bags correspond to this a plurality of thick liquid subassemblies can be simultaneously from inside to outside realize the slip casting in proper order to each thick liquid bag, and the workman can all detect the deformation condition of the soil body around the building after every time slip casting, so that ensure that the soil body that produces deformation around the building can accurately resume.
Optionally, a stock component for storing residual cement slurry in the grouting pipe is arranged on the grouting pipe.
Through adopting above-mentioned technical scheme, stock subassembly can store the residual cement thick liquid in the slip casting pipe after every time slip casting, has reduced the cement thick liquid solidification of remaining in the slip casting pipe, leads to the slip casting pipe unable possibility of carrying out the slip casting next time.
Optionally, the stock subassembly including set up in the surplus feed cylinder of slip casting pipe below, the inside cavity of surplus feed cylinder just the bottom of slip casting pipe extends to in the surplus feed cylinder, the bottom intercommunication of slip casting pipe has the relief valve, the relief valve electricity is connected with control system.
By adopting the technical scheme, the control system opens the discharge valve, and the grouting pump pumps clean water into the grouting pipe, so that the clean water can completely flush out residual cement slurry in the grouting pipe into the residual material barrel.
Optionally, a plurality of penetration holes are formed between the inner side wall and the outer side wall of the residual charging barrel, and water permeable cloth is arranged on the inner side wall of the residual charging barrel.
Through adopting above-mentioned technical scheme, the moisture in the surplus feed cylinder passes permeable cloth and infiltration hole and can permeate away, and then ensures that there is abundant space in the surplus feed cylinder and supplies the row of the intraductal residual material of slip casting behind the slip casting next time to go into.
Optionally, the discharge valve is near the top of the remainder cartridge.
Through adopting above-mentioned technical scheme to this makes the accumulational cement in the surplus feed cylinder be difficult to submerge the discharge end of relief valve, and then ensures that the intraductal remaining cement thick liquid of slip casting can be discharged into in the surplus feed cylinder smoothly.
Optionally, the grouting pipe is communicated with an exhaust pipe, an exhaust valve is arranged on the exhaust pipe, and the exhaust valve is electrically connected to the control system.
By adopting the technical scheme, when mud is injected into the grouting pipe, the exhaust valve is opened, so that the original air in the grouting pipe is exhausted. And when grouting is carried out, the inside of the slurry bag is completely cement slurry, so that the recovery effect of soil deformation is improved.
In a second aspect, the present application provides a control method of a deformation control device for a foundation pit soil body, which adopts the following technical scheme:
a control method of a foundation pit soil deformation control device comprises the following steps:
s1, drilling at least one drill hole in soil around a foundation pit;
s2, installing the grouting bag on the grouting pipe, and then burying the grouting pipe into the drill hole;
s3, starting the grouting pump, and injecting cement slurry into the slurry bag;
s4, detecting deformation of soil around the foundation pit, judging whether the deformation exceeds an early warning value, if so, repeating the step S3, and controlling the deformation.
Through adopting above-mentioned technical scheme, constructor will assemble the thick liquid bag and put into the drilling together with the slip casting pipe, and the space that remains in the drilling is filled with earth, opens the slip casting pump afterwards to pour into cement thick liquid into in the thick liquid bag, the thick liquid bag inflation to this exerts the reaction force to the soil body, and the deformation that the soil body produced around the building receives the effort of thick liquid bag and can resume.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the grouting pump injects cement slurry into the grouting bag through the grouting pipe, the grouting bag expands, so that a reaction force is applied to soil body, and deformation generated by the soil body around the building is recovered by the action force of the grouting bag;
2. the grouting assemblies can sequentially grouting the grouting bags from inside to outside simultaneously, and workers can detect deformation conditions of soil around the building after each grouting, so that the deformed soil around the building can be accurately recovered;
3. the storage assembly can store the cement slurry remained in the grouting pipe after each grouting, so that the possibility that the cement slurry remained in the grouting pipe is solidified, and the grouting pipe cannot perform the next grouting is reduced.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of the connection relationship among the pulp bladder, the grouting pump and the residual material cylinder in the embodiment of the application.
Fig. 3 is a cross-sectional view showing the connection relationship among the pulp bladder, the grouting pipe and the residual barrel in the embodiment of the present application.
Reference numerals illustrate: 1. soil mass; 2. drilling holes; 3. grouting pipe; 4. a grouting pump; 5. pulp bags; 6. a three-way valve; 7. a residual charging barrel; 71. a penetration hole; 8. a discharge valve; 9. a water permeable cloth; 10. an exhaust pipe; 11. and (5) exhausting the valve.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-3.
The embodiment of the application discloses a deformation control device of foundation pit soil body. Referring to fig. 1, 2 and 3, the deformation control device of foundation pit soil body includes grouting pipe 3 and sets up a plurality of slip casting subassemblies on grouting pipe 3, and soil body 1 around the foundation pit is gone up to bore at least one drilling 2, and grouting pipe 3 is vertical to be buried in drilling 2, and grouting pipe 3's top intercommunication has grouting pump 4.
Referring to fig. 1, 2 and 3, the grout filling assembly comprises a hollow and sealed grout bag 5, the grout bag 5 is arranged in a spindle shape, a grouting pipe 3 penetrates through the grout bag 5 and is bonded with the grout bag 5, and the grouting pipe 3 is communicated with the inner cavity of the grout bag 5. After the grouting pipe 3 and the filler assembly are placed in the drilling hole 2, the empty space in the drilling hole 2 is filled with soil.
Referring to fig. 1, 2 and 3, the grouting pump 4 is started, the grouting pump 4 injects cement slurry into the grouting bag 5 through the grouting pipe 3, the grouting bag 5 is inflated, so that a reaction force is applied to the soil body 1 around the drilling hole 2, and the soil body 1 which is deformed around the building can be pushed to recover and compensate.
Referring to fig. 1, 2 and 3, the pulp sacs 5 of each pulp filling assembly are provided with a plurality of pulp sacs from inside to outside, the positions of the grouting pipes 3 corresponding to the inner cavities of each pulp sac 5 are provided with three-way valves 6, the three-way valves 6 are used for controlling whether cement pulp is injected into the corresponding pulp sacs 5, and the three-way valves 6 are electrically connected with a control system.
Referring to fig. 1, 2 and 3, under the control of the control system, the three-way valve 6 corresponding to the slurry bags 5 is opened, and the three-way valves 6 corresponding to the rest of the slurry bags 5 are closed, so that the slurry filling assemblies can simultaneously realize sequential grouting of each slurry bag 5 from inside to outside, and workers can detect deformation conditions of soil bodies 1 around a building after each grouting, so that the soil bodies 1 deformed around the building can be accurately recovered.
Referring to fig. 1, 2 and 3, since the grouting of each grouting bag 5 in the same filler assembly shares one grouting pipe 3, the residual cement slurry in the grouting pipe 3 needs to be removed after each grouting, if the residual cement slurry in the grouting pipe 3 is not removed, the grouting pipe 3 cannot realize the next grouting after the cement slurry is solidified and hardened, and for this purpose, a storage assembly for storing the residual cement slurry in the grouting pipe 3 is arranged on the grouting pipe 3.
Referring to fig. 1, 2 and 3, the stock assembly includes a residual barrel 7 disposed below the grouting pipe 3 and hollow inside, the bottom end of the grouting pipe 3 extends into the residual barrel 7 and is communicated with a discharge valve 8, and the discharge valve 8 is electrically connected with a control system.
During grouting, the discharge valve 8 is closed. After grouting is completed, the control system closes the three-way valve 6 and opens the discharge valve 8, and the grouting pump 4 can pump clean water into the grouting pipe 3, so that the residual cement slurry in the grouting pipe 3 can be fully filled into the residual material cylinder 7 by the clean water, and the grouting pipe 3 can perform the next grouting operation.
Referring to fig. 1, 2 and 3, a plurality of penetration holes 71 are formed between the inner and outer sidewalls of the residual cylinder 7, and a water permeable cloth 9 is adhered to the inner sidewall of the residual cylinder 7, and the pores of the water permeable cloth 9 are small.
The water in the cement slurry entering the residual cylinder 7 can flow out of the residual cylinder 7 through the water permeable cloth 9 and the permeation holes 71, and the cement is accumulated at the bottom of the residual cylinder 7.
Through the arrangement of the penetrating holes 71 and the permeable cloth 9, the water in the residual material cylinder 7 is discharged, so that when the residual material cylinder 7 has sufficient space for storing cement slurry remained in the grouting pipe 3 and clean water for cleaning for multiple grouting.
Referring to fig. 1, 2 and 3, the discharge valve 8 is close to the top of the residual barrel 7, so that the cement accumulated in the residual barrel 7 is not easy to submerge the discharge end of the discharge valve 8, and the cement slurry remained in the grouting pipe 3 can be smoothly discharged into the residual barrel 7 when grouting is performed next time.
Referring to fig. 1, 2 and 3, since part of air exists in the grouting pipe 3 every time grouting is performed, if air is not discharged, air in the grouting pipe 3 may enter the corresponding grouting bag 5 during grouting.
Although the air can expand the slurry bag 5, the shape of the expanded and solidified slurry bag can be changed, and when the deformation force of the soil body 1 acts, part of the slurry bag 5 can be deformed to a certain extent, so that the recovery and compensation effects on the deformation of the soil body 1 are affected.
For this purpose, the grouting pipe 3 is connected with an exhaust pipe 10, the exhaust pipe 10 is provided with an exhaust valve 11, and the exhaust valve 11 is electrically connected to a control system. When the cement slurry is introduced into the grouting pipe 3 by opening the exhaust pipe 10 and temporarily closing the three-way valve 6, the air in the grouting pipe 3 can be exhausted through the exhaust valve 11.
When the cement slurry overflows the exhaust pipe 10, the air in the grouting pipe 3 is completely exhausted, and at the moment, the corresponding tee pipe can be opened to realize grouting, so that the whole grouting of the cement slurry in the slurry bag 5 can be ensured.
The slurry bag 5 completely filled with cement slurry has a fixed and stable form after solidification, and is not easy to change even under the action of deformation force of the soil body 1, so that the recovery and compensation effects on the deformation of the soil body 1 are good.
The implementation principle of the deformation control device for the foundation pit soil body is as follows: at least one drilling hole 2 is drilled on the soil body 1 around the foundation pit, a grouting bag 5 is installed on the grouting pipe 3, then the grouting pipe 3 is buried in the drilling hole 2, and the space left in the drilling hole 2 is filled with soil. Starting a grouting pump 4, opening an exhaust valve 11, injecting cement slurry into the grouting pipe 3 by the grouting pump 4, and exhausting the original air in the grouting pipe 3 through the exhaust valve 11; after that, the control system opens the corresponding three-way valve 6 of the pulp bag 5, so as to inject cement slurry into the corresponding pulp bag 5, and the pulp bag 5 is inflated; after a sufficient amount of cement slurry is injected, the three-way valve 6 is closed, the discharge valve 8 is opened, the grouting pump 4 injects clean water into the grouting pipe 3, the clean water washes out all the residual cement slurry in the grouting pipe 3 into the residual material cylinder 7, water in the residual material cylinder 7 leaks out through the water permeable cloth 9 and the permeation holes 71, and cement is accumulated at the cylinder bottom of the residual material cylinder 7. And finally, detecting the deformation of the soil body 1 around the foundation pit, judging whether the deformation exceeds the early warning value, if so, repeating the operation process and controlling the deformation.
The embodiment also discloses a control method of the deformation control device of the foundation pit soil body, which comprises the following steps:
s1, drilling at least one drilling hole 2 on a soil body 1 around a foundation pit;
s2, installing the grouting bag 5 on the grouting pipe 3, then burying the grouting pipe 3 into the drilling hole 2, and filling the vacant place in the drilling hole 2 with soil;
s3, starting the grouting pump 4, opening the exhaust valve 11, injecting cement slurry into the grouting pipe 3 by the grouting pump 4, and exhausting the original air in the grouting pipe 3 through the exhaust valve 11; thereafter, the control system opens the corresponding three-way valve 6 of the pulp bag 5, so that cement slurry is injected into the corresponding pulp bag 5, and the pulp bag 5 is inflated; after a sufficient amount of cement slurry is injected, the three-way valve 6 is closed, the discharge valve 8 is opened, the grouting pump 4 injects clean water into the grouting pipe 3, the clean water washes out all the cement slurry remained in the grouting pipe 3 into the residual material cylinder 7, water in the residual material cylinder 7 leaks out through the water permeable cloth 9 and the permeation hole 71, and cement is accumulated at the cylinder bottom of the residual material cylinder 7;
s4, detecting deformation of the soil body 1 around the foundation pit, judging whether the deformation exceeds an early warning value, if so, repeatedly executing the step S3, and controlling the deformation.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (5)
1. The utility model provides a deformation control device of foundation ditch soil body which characterized in that: the grouting device comprises a grouting pipe (3) and a plurality of grouting components, wherein the grouting pipe (3) is buried in a soil body (1), the grouting components are arranged on the grouting pipe (3), a grouting pump (4) is communicated with the top of the grouting pipe (3), the grouting components comprise grouting bags (5) which are hollow in the inside and are arranged in a sealing manner, the grouting pipe (3) penetrates through the grouting bags (5) and is fixedly connected with the grouting bags, and the grouting pipe (3) is communicated with the inner cavity of the grouting bags (5);
the grouting device comprises grouting bags (5), wherein a plurality of grouting pipes (3) are arranged from inside to outside, three-way valves (6) for injecting cement slurry into the grouting pipes are arranged at positions of the grouting pipes (3) corresponding to the grouting bags (5), and the three-way valves (6) are electrically connected with a control system; the grouting pipe (3) is provided with a storage component for storing residual cement slurry in the grouting pipe (3);
the material storage assembly comprises a residual material barrel (7) arranged below the grouting pipe (3), the residual material barrel (7) is hollow, the bottom end of the grouting pipe (3) extends to the inside of the residual material barrel (7), a material discharge valve (8) is communicated with the bottom end of the grouting pipe (3), and the material discharge valve (8) is electrically connected with a control system.
2. The foundation pit soil body deformation control device according to claim 1, wherein: a plurality of penetration holes (71) are formed between the inner side wall and the outer side wall of the residual charging barrel (7), and water permeable cloth (9) is arranged on the inner side wall of the residual charging barrel (7).
3. The foundation pit soil body deformation control device according to claim 1, wherein: the discharge valve (8) is close to the top of the residual charging barrel (7).
4. The foundation pit soil body deformation control device according to claim 1, wherein: the grouting pipe (3) is communicated with an exhaust pipe (10), an exhaust valve (11) is arranged on the exhaust pipe (10), and the exhaust valve (11) is electrically connected to a control system.
5. A control method of a foundation pit soil body deformation control device according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
s1, drilling at least one drilling hole (2) on soil (1) around a foundation pit;
s2, installing the grouting bag (5) on the grouting pipe (3), and then burying the grouting pipe (3) into the drilling hole (2);
s3, starting the grouting pump (4), and injecting cement slurry into the slurry bag (5);
s4, detecting deformation of the soil body (1) around the foundation pit, judging whether the deformation exceeds an early warning value, if so, repeatedly executing the step S3, and controlling the deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210153886.8A CN114411692B (en) | 2022-02-19 | 2022-02-19 | Deformation control device and control method for foundation pit soil body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210153886.8A CN114411692B (en) | 2022-02-19 | 2022-02-19 | Deformation control device and control method for foundation pit soil body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114411692A CN114411692A (en) | 2022-04-29 |
| CN114411692B true CN114411692B (en) | 2024-02-20 |
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| CN202210153886.8A Active CN114411692B (en) | 2022-02-19 | 2022-02-19 | Deformation control device and control method for foundation pit soil body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108755699A (en) * | 2018-06-07 | 2018-11-06 | 上海勘察设计研究院(集团)有限公司 | The deformation control method and device of a kind of foundation pit periphery soil body |
| CN111006952A (en) * | 2019-11-26 | 2020-04-14 | 河海大学 | Experimental test device and grouting method for reinforcing fractured rock sample through high-pressure permeation grouting |
| CN112442978A (en) * | 2019-09-03 | 2021-03-05 | 机械工业勘察设计研究院有限公司 | Structure and method for improving bearing capacity of bored pile by drilling holes in pile |
| CN113638398A (en) * | 2021-09-13 | 2021-11-12 | 天津大学 | Active dynamic control method for stress of bag type grouting soil body |
| WO2022011913A1 (en) * | 2020-05-06 | 2022-01-20 | 江苏景源万河环境科技有限公司 | Prestressed unbonded anchor bolt rebar, anchor bolt, and construction method |
| CN215669519U (en) * | 2021-06-28 | 2022-01-28 | 上海勘察设计研究院(集团)有限公司 | Quick-hardening type bag type grouting structure |
-
2022
- 2022-02-19 CN CN202210153886.8A patent/CN114411692B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108755699A (en) * | 2018-06-07 | 2018-11-06 | 上海勘察设计研究院(集团)有限公司 | The deformation control method and device of a kind of foundation pit periphery soil body |
| CN112442978A (en) * | 2019-09-03 | 2021-03-05 | 机械工业勘察设计研究院有限公司 | Structure and method for improving bearing capacity of bored pile by drilling holes in pile |
| CN111006952A (en) * | 2019-11-26 | 2020-04-14 | 河海大学 | Experimental test device and grouting method for reinforcing fractured rock sample through high-pressure permeation grouting |
| WO2022011913A1 (en) * | 2020-05-06 | 2022-01-20 | 江苏景源万河环境科技有限公司 | Prestressed unbonded anchor bolt rebar, anchor bolt, and construction method |
| CN215669519U (en) * | 2021-06-28 | 2022-01-28 | 上海勘察设计研究院(集团)有限公司 | Quick-hardening type bag type grouting structure |
| CN113638398A (en) * | 2021-09-13 | 2021-11-12 | 天津大学 | Active dynamic control method for stress of bag type grouting soil body |
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| CN114411692A (en) | 2022-04-29 |
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