CN211285634U - Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well - Google Patents
Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well Download PDFInfo
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- CN211285634U CN211285634U CN201921568053.8U CN201921568053U CN211285634U CN 211285634 U CN211285634 U CN 211285634U CN 201921568053 U CN201921568053 U CN 201921568053U CN 211285634 U CN211285634 U CN 211285634U
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Abstract
The utility model is used for guarantee shaft jacking working well back cover bottom structure of quality, including the enclosure body structure of the shaft bottom elevation 2m ~ 4m of being dark in the pipe jacking working well, lay the close slip casting layer of pressure by bottom to upper portion in proper order in the enclosure body structure, first concrete back cover and geotechnological cloth under water, the diameter of geotechnological cloth is greater than the diameter of pipe jacking working well, the four sides and the wall of a well of geotechnological cloth closely laminate, the geotechnological cloth upper berth is equipped with the second concrete back cover under water, the second is concrete back cover compaction under water and seals geotechnological cloth and wall of a well laminating department under water, the second is concrete back cover under water and is equipped with the plank sheathing, the plank sheathing upper berth is equipped with the third concrete back cover under water, the top of third. 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 utility model relates to a construction field of push pipe working well especially relates to a bottom shaft structure for guaranteeing push pipe working well back cover quality.
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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main objective is through taking the shaft bottom structure that is used for guaranteeing push pipe working well back cover quality, the infiltration volume of effectual control hole bottom sand, water is used for ensureing push pipe working well foundation safety to phenomenons such as flowing water quicksand that back cover measure, conventional back cover in push pipe working well shaft bottom exist.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
the utility model 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.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses an above technical means can avoid the phenomenon of quicksand, infiltration to appear in the work well back cover, and the work well back cover quality is controlled, distributes comparatively complicated geological environment and the department such as river bank that peripheral water content is comparatively abundant in the soil layer, plays the isolated effect to secret quicksand, infiltration.
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 present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection 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 bottom sealing construction method for ensuring the bottom sealing quality of the pipe-jacking working well 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.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present 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 the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (3)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921568053.8U CN211285634U (en) | 2019-09-20 | 2019-09-20 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921568053.8U CN211285634U (en) | 2019-09-20 | 2019-09-20 | Bottom hole structure for ensuring bottom sealing quality of pipe-jacking working well |
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| CN211285634U true CN211285634U (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593274A (en) * | 2019-09-20 | 2019-12-20 | 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 and bottom sealing construction method |
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2019
- 2019-09-20 CN CN201921568053.8U patent/CN211285634U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593274A (en) * | 2019-09-20 | 2019-12-20 | 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 and bottom sealing construction method |
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