CN110593274A - Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well and bottom sealing construction method - Google Patents
Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well and bottom sealing construction method Download PDFInfo
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- CN110593274A CN110593274A CN201910889566.7A CN201910889566A CN110593274A CN 110593274 A CN110593274 A CN 110593274A CN 201910889566 A CN201910889566 A CN 201910889566A CN 110593274 A CN110593274 A CN 110593274A
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- China
- Prior art keywords
- underwater concrete
- working well
- pipe
- well
- bottom sealing
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Links
- 238000007789 sealing Methods 0.000 title claims abstract description 59
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 239000004746 geotextile Substances 0.000 claims abstract description 27
- 239000002023 wood Substances 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 7
- 238000005056 compaction Methods 0.000 claims abstract description 4
- 238000009412 basement excavation Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 5
- 238000010030 laminating Methods 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000004576 sand Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000009931 harmful effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
-
- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
The invention relates to a shaft bottom structure for ensuring the sealing quality of a pipe-jacking working well and a shaft bottom sealing construction method, which comprises an enclosure body structure with the shaft bottom elevation 2-4 m deeper than the pipe-jacking working well, wherein a compaction grouting layer, a first underwater concrete sealing bottom layer and a geotextile are sequentially paved from the bottom to the upper part in the enclosure body structure, the diameter of the geotextile is larger than that of the pipe-jacking working well, four edges of the geotextile are tightly attached to a well wall, a second underwater concrete sealing bottom layer is paved on the geotextile, the bonding part of the geotextile and the well wall is compacted and sealed by the second underwater concrete sealing bottom layer, a wood template is paved on the second underwater concrete sealing bottom layer, a third underwater concrete sealing bottom layer is paved on the wood template, and the top of the third underwater concrete sealing bottom layer is the shaft bottom. The phenomenon of sand running and water seepage at the bottom sealing of the working well can be avoided, the bottom sealing quality of the working well is controlled, and the isolation effect on underground sand running and water seepage is achieved at places such as a geological environment with complex soil layer distribution and a river with rich peripheral water content.
Description
Technical Field
The invention relates to the construction field of a pipe-jacking working well, in particular to a bottom hole structure and a bottom hole sealing construction method for ensuring the bottom sealing quality of the pipe-jacking working well.
Background
In present municipal administration push pipe work progress, push pipe work well is as the main access way of push pipe mechanical equipment, it is especially important for operating personnel to provide safe construction operation environment, in push pipe work well construction of present day, push pipe shaft bottom often can have the running sand, phenomenons such as infiltration, endanger foundation ditch safety on the one hand, on the other hand can cause harmful effects to the subsidence of peripheral earth's surface environment, form the side direction extruder destruction to peripheral pipeline, infiltration for avoiding bottom seal quality problem brings, harmful effects that the running sand brought, maintain foundation ditch safety, consequently, need find a kind of bottom hole structure that can be convenient, simple and easy, easily be under construction, and can effectively guarantee push pipe work well bottom seal quality, in order to deal with above-mentioned problem.
Disclosure of Invention
Aiming at the phenomena of bottom sealing measures of the bottom of the pipe-jacking working well, flowing water and quicksand existing in the conventional bottom sealing and the like, the invention mainly aims to effectively control the infiltration amount of bottom sand and water of a pit by adopting a bottom structure and a bottom sealing construction method for ensuring the bottom sealing quality of the pipe-jacking working well, and ensure the safety of the pit of the pipe-jacking working well.
The invention solves the technical problems through the following technical scheme:
the invention provides a shaft bottom structure for ensuring the bottom sealing quality of a pipe-jacking working well, which is characterized in that, which comprises an enclosure body structure of a pipe-jacking working well, wherein the enclosure body structure is 2-4 m deeper than the bottom elevation of the pipe-jacking working well, a compaction grouting layer, a first underwater concrete bottom sealing layer and geotextile are sequentially paved in the enclosure body structure from the bottom to the upper part, the diameter of the geotextile is larger than that of the pipe-jacking working well, four edges of the geotextile are tightly attached to the wall of the pipe-jacking working well, a second underwater concrete bottom sealing layer is laid on the geotextile and used for compacting and sealing the joint of the geotextile and the well wall, and a wood template is paved on the second underwater concrete bottom sealing layer, a third underwater concrete bottom sealing layer is paved on the wood template, and the top of the third underwater concrete bottom sealing layer is the shaft bottom.
Preferably, the distance between the first underwater concrete bottom sealing layer and the upper well bottom elevation is 120-150 mm.
Preferably, the third underwater concrete bottom sealing layer has a thickness of 100 mm.
The invention also provides a bottom sealing construction method for ensuring the bottom sealing quality of the pipe-jacking working well, which is characterized by comprising the following steps:
s1, ensuring that the enclosure body structure of the pipe-jacking working well is 2-4 m deeper than the bottom elevation of the pipe-jacking working well, and compacting and grouting soil in the enclosure body structure and in the range of 2-4 m deeper than the bottom elevation;
s2, after earthwork is excavated to the well bottom elevation, continuing to excavate downwards to the depth of 1-2 m, and after excavation is finished, injecting underwater concrete into the bottom of the well to the well bottom elevation 120-150 mm away from the upper side;
s3, after the underwater concrete is initially set, laying geotextile on the underwater concrete, wherein the diameter of the geotextile is larger than that of the pipe-jacking working well, four edges of the geotextile are tightly attached to the wall of the pipe-jacking working well, and the attached part is compacted and sealed by the underwater concrete;
and S4, after the pit bottom concrete is leveled, covering a wood template, and continuously pouring 100 mm-thick underwater concrete on the wood template for bottom sealing and leveling to form the final bottom sealing of the working well.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
by the technical means and measures, the phenomena of sand running and water seepage at the bottom sealing of the working well can be avoided, the bottom sealing quality of the working well is controlled, and the isolation effect on the underground sand running and water seepage is achieved in the geological environment with complex soil layer distribution and the river sides with rich water content at the periphery.
Drawings
Fig. 1 is a schematic structural diagram of a bottom hole structure for ensuring the bottom sealing quality of a pipe-jacking working well according to a preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the present embodiment provides a bottom structure for ensuring bottom sealing quality of a pipe-jacking working well, which includes a surrounding body structure 1 of the pipe-jacking working well, the surrounding body structure 1 is deeper than a bottom elevation 2 m-4 m of the pipe-jacking working well 2, a pressure-sealing grouting layer 3, a first underwater concrete bottom sealing layer 4 and a geotextile 5 are sequentially laid from bottom to upper part in the surrounding body structure 1, the first underwater concrete bottom sealing layer 4 is 120 mm-150 mm away from the top bottom elevation, the diameter of the geotextile 5 is larger than that of the pipe-jacking working well 2, four sides of the geotextile 5 are tightly attached to a well wall of the pipe-jacking working well 2, a second underwater concrete bottom sealing layer 6 is laid on the geotextile 5, the second underwater concrete bottom sealing layer 6 is pressed to seal a joint of the geotextile 5 and the well wall, a wood formwork 7 is laid on the second underwater concrete bottom sealing layer 6, and a third underwater concrete bottom sealing layer 8 is paved on the wooden template 7, the top of the third underwater concrete bottom sealing layer 8 is the bottom of the well, and the thickness of the third underwater concrete bottom sealing layer 8 is 100 mm.
The invention also provides a bottom sealing construction method for ensuring the bottom sealing quality of the pipe-jacking working well, which comprises the following steps:
s1, ensuring that the enclosure body structure of the pipe-jacking working well is 2-4 m deeper than the bottom elevation of the pipe-jacking working well, and compacting and grouting soil in the enclosure body structure and in the range of 2-4 m deeper than the bottom elevation.
S2, after earth is excavated to the well bottom elevation, the earth continues to be excavated downwards by the depth of 1-2 m, and after the excavation is finished, C35 underwater concrete is injected into the bottom of the well to the position 120-150 mm away from the upper well bottom elevation.
S3, after the underwater concrete is initially set, assigning a construction operator to go into the well to lay geotextile, laying geotextile on the underwater concrete, wherein the diameter of the geotextile is larger than that of the pipe-jacking working well, the four edges of the geotextile are tightly attached to the wall of the pipe-jacking working well, and the attaching position is compacted and sealed by C35 underwater concrete.
And S4, after the pit bottom concrete is leveled, covering a wood template, and continuously pouring 100 mm-thick underwater C35 concrete on the wood template for bottom sealing and leveling to form the final bottom seal of the working well.
Firstly, solidifying a soil body by using compaction grouting before the formation of a surrounding body structure and the excavation of a foundation pit; secondly, after excavating the earthwork to the elevation of the pit bottom, excavating downwards to a depth of 1-2 m, injecting C35 underwater concrete with the depth of 1-2 m, sending an operator to additionally lay a layer of geotextile and a wood template on the concrete before the final setting time of the underwater concrete, requiring the corner parts of the geotextile to be closely attached to the enclosure structure, splicing the templates with the same size as the position of the pit bottom according to the size and the shape of a working well, and hoisting the templates to the pit bottom for laying.
Through the technical means and measures, the phenomena of sand running and water seepage at the bottom sealing of the working well can be avoided, the bottom sealing quality of the working well is controlled, and the isolation effect on the underground sand running and water seepage is achieved in places such as a geological environment with complex soil layer distribution and a river bank with rich water content at the periphery.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (4)
1. The utility model provides a shaft bottom structure for guaranteeing push pipe working well back cover quality, its characterized in that, its enclosure body structure that includes push pipe working well, enclosure body structure is darker than push pipe working well's shaft bottom elevation 2m ~ 4m, it has compacted slip casting layer, first underwater concrete back cover and geotechnological cloth to have laid in proper order by bottom to upper portion in the enclosure body structure, the diameter of geotechnological cloth is greater than push pipe working well's diameter, the four sides of geotechnological cloth closely laminate with push pipe working well's the wall of a well, geotechnological cloth upper berth is equipped with second underwater concrete back cover, second underwater concrete back cover compaction seals geotechnological cloth and wall of a well laminating department, second underwater concrete back cover upper berth is equipped with the plank sheathing, plank sheathing upper berth is equipped with third underwater concrete back cover, the top of third underwater concrete back cover is shaft bottom promptly.
2. The bottom hole structure for guaranteeing the bottom sealing quality of the pipe-jacking working well as claimed in claim 1, wherein the first underwater concrete bottom sealing layer has a bottom hole elevation 120 mm-150 mm above the distance.
3. The bottom hole structure for guaranteeing the bottom sealing quality of a pipe-jacking working well as claimed in claim 1, wherein the thickness of the third underwater concrete bottom sealing layer is 100 mm.
4. A bottom sealing construction method for guaranteeing the bottom sealing quality of a pipe-jacking working well is characterized by comprising the following steps:
s1, ensuring that the enclosure body structure of the pipe-jacking working well is 2-4 m deeper than the bottom elevation of the pipe-jacking working well, and compacting and grouting soil in the enclosure body structure and in the range of 2-4 m deeper than the bottom elevation;
s2, after earthwork is excavated to the well bottom elevation, continuing to excavate downwards to the depth of 1-2 m, and after excavation is finished, injecting underwater concrete into the bottom of the well to the well bottom elevation 120-150 mm away from the upper side;
s3, after the underwater concrete is initially set, laying geotextile on the underwater concrete, wherein the diameter of the geotextile is larger than that of the pipe-jacking working well, four edges of the geotextile are tightly attached to the wall of the pipe-jacking working well, and the attached part is compacted and sealed by the underwater concrete;
and S4, after the pit bottom concrete is leveled, covering a wood template, and continuously pouring 100 mm-thick underwater concrete on the wood template for bottom sealing and leveling to form the final bottom sealing of the working well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889566.7A CN110593274A (en) | 2019-09-20 | 2019-09-20 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well and bottom sealing construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889566.7A CN110593274A (en) | 2019-09-20 | 2019-09-20 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well and bottom sealing construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110593274A true CN110593274A (en) | 2019-12-20 |
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ID=68861692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910889566.7A Pending CN110593274A (en) | 2019-09-20 | 2019-09-20 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well and bottom sealing construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110593274A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455726A (en) * | 2014-11-20 | 2015-03-25 | 广州市市政集团有限公司 | Pipe-jacking construction method for pipeline bottom grouting reinforcement |
| CN109881658A (en) * | 2019-02-15 | 2019-06-14 | 湖南中天青鼎工程科技有限公司 | A kind of radial construction technology for red mud consolidation draining |
| CN211285634U (en) * | 2019-09-20 | 2020-08-18 | 上海建工七建集团有限公司 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well |
-
2019
- 2019-09-20 CN CN201910889566.7A patent/CN110593274A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455726A (en) * | 2014-11-20 | 2015-03-25 | 广州市市政集团有限公司 | Pipe-jacking construction method for pipeline bottom grouting reinforcement |
| CN109881658A (en) * | 2019-02-15 | 2019-06-14 | 湖南中天青鼎工程科技有限公司 | A kind of radial construction technology for red mud consolidation draining |
| CN211285634U (en) * | 2019-09-20 | 2020-08-18 | 上海建工七建集团有限公司 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well |
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