CN114319405A - Construction method for micro-disturbance vertical press-in type thin-wall open caisson in complex environment - Google Patents
Construction method for micro-disturbance vertical press-in type thin-wall open caisson in complex environment Download PDFInfo
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- CN114319405A CN114319405A CN202111506985.1A CN202111506985A CN114319405A CN 114319405 A CN114319405 A CN 114319405A CN 202111506985 A CN202111506985 A CN 202111506985A CN 114319405 A CN114319405 A CN 114319405A
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Abstract
The invention relates to a construction method of a vertical press-in type thin-wall open caisson in a complex environment, which comprises the steps of firstly, driving a circle of secant piles along the outer side of the thin-wall open caisson, integrally connecting the tops of the secant piles through a ring beam to provide press-down counter force, arranging a ground anchor counter force device, then providing downward pulling force through a center penetrating jack, applying pressure on a bracket of the open caisson wall by the jack to generate the press-down force on the open caisson, and finally, pressing the thin-wall open caisson into a soil body while taking soil. The construction method adopts the secant pile to provide downward pressure and also serves as an isolation enclosure body and an open caisson bottom sealing uplift pile; meanwhile, reasonable and controllable vertical downward pressure is artificially applied to the open caisson, so that the open caisson has a proper sinking coefficient, other resistance reducing means are used for leading the downward pressure to sink the open caisson, the sinking can be controlled under the working condition of reserving the soil plug, the adverse effect of the soil layer on the open caisson can be greatly eliminated, the construction risk is reduced, the work efficiency is improved, and the influence on the surrounding environment is furthest reduced by reducing the disturbance of the soil body.
Description
Technical Field
The invention relates to a thin-wall open caisson construction method in a complex environment, in particular to a thin-wall open caisson construction method which reduces the influence on the surrounding environment to the maximum extent by reducing the disturbance of a soil body.
Background
With the rapid development of social economy and the acceleration of urbanization process in China, subways, sewage pipelines and power pipelines in cities are rapidly developed; the working well of the tunnel usually adopts underground continuous walls, occlusive piles and cast-in-situ bored piles as enclosures; the ultra-deep foundation pit relates to confined water, the foundation pit excavation leakage risk is high, the exposure time of the foundation pit excavation is long, the confined water needs to be reduced continuously, and the peripheral disturbance and settlement control difficulty is large; however, the surrounding structures of the urban area are many, and land borrowing is difficult; because the urban area is limited and the settlement requirement of surrounding building structures is high, a brand-new process is urgently needed to solve the problems.
Disclosure of Invention
The invention provides a construction method of a micro-disturbance vertical press-in type thin-wall open caisson in a complex environment, which can solve the practical problems that construction is difficult to borrow land, the settlement requirements of surrounding building structures are high and the like in a complex environment of a city.
In order to solve the problems, the technical scheme of the invention is as follows: a construction method for a vertical press-in type thin-wall sunk well in a complex environment comprises the steps of firstly, driving a circle of secant pile along the outer side of the thin-wall sunk well, wherein the depth of the secant pile is slightly lower than the elevation of a blade foot, integrally connecting the tops of the secant pile through a ring beam to provide press-down counter force, arranging a plurality of ground anchor counter force devices, then providing downward pulling force through a center penetrating jack, applying pressure on a bracket of the sunk well on a well wall by the jack to generate the press-down force on the sunk well, and finally pressing the thin-wall sunk well into a soil body while taking soil.
Furthermore, in the process of pressure sinking, the jack cylinder jacks upwards, the reaction steel strand transfers pressure to the occlusive pile, and the occlusive pile plays a role in uplift pile.
Furthermore, the secant pile forms a set of enclosure system, and in the sinking process of the open caisson, the secant pile plays a role in isolating the pile, so that the disturbance of the sinking of the open caisson to the surrounding environment is reduced.
Furthermore, after the open caisson is sunk to a position, the secant pile and the open caisson are connected by adopting the connecting beam, the open caisson and the secant pile form a whole, the secant pile increases the anti-floating force of the open caisson, and the safety of the open caisson in the using process is ensured.
Furthermore, the whole sinking well pressure sinking stage is carried out under the condition of no water drainage, and a certain soil plug height is always kept in the sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson sinking earlier stage, middle stage and final sinking mainly adopt a mechanical soil digging mode, and a diver and a diving robot implement soil taking operation when necessary.
Furthermore, when soil is pressed into the thin-wall open caisson, soil plugs with proper height are reserved at the lower sections of the edge angles of the open caisson to balance the pressure of the soil inside and outside the open caisson, so that the slippage phenomenon of the soil outside the open caisson is greatly reduced, and the safety of surrounding building structures is more effectively ensured.
Furthermore, after the open caisson is sunk in place, underwater bottom sealing is carried out, meanwhile, the thin-wall open caisson is effectively connected with the pile top ring beam of the secant pile, the secant pile plays a role in resisting the pile, effective anti-buoyancy force is provided, the anti-floating requirement of the thin-wall open caisson is met, and the use safety of the open caisson is ensured.
Furthermore, the counter-force anchor pulling of the ground anchor counter-force device is a plurality of steel stranded wires, the counter-force anchor pulling is flexibly adjusted according to the sinking depth, enough pressure is provided for sinking, the operation is more convenient and faster, and the sinking speed is ensured; the depth of the sunk well blade foot penetrating into the soil layer is deeper through the ground anchor counterforce device, so that a higher soil plug is kept in the sunk well, and meanwhile, a sufficient sinking coefficient is still provided.
Furthermore, the jack steel strand combination device adopted by the penetrating jack is double-sleeve, can synchronously correct the deviation, can independently correct the deviation according to the actual condition, realizes remote control on the open caisson sinking jack through a PLC system, and timely masters the stroke displacement, the oil pressure and the related equipment condition.
Furthermore, the open caisson corbel, the through jack, the steel strand, the ring beam and the secant pile form a complete pressure-sinking force transmission system.
The invention has the beneficial effects that: the invention relates to a construction method of a micro-disturbance vertical press-in type thin-wall open caisson in a complex environment, which is characterized in that a circle of secant pile is arranged outside a well in advance to provide downward pressure and is also used as an isolation enclosure and an open caisson bottom sealing uplift pile; meanwhile, reasonable and controllable vertical downward pressure is artificially applied to the open caisson, so that the open caisson has a proper sinking coefficient, other resistance reducing means are used for leading the downward pressure to sink the open caisson, the sinking can be controlled under the working condition of reserving the soil plug, the adverse effect of the soil layer on the open caisson can be greatly eliminated, the construction risk is reduced, the work efficiency is improved, and the influence on the surrounding environment is furthest reduced by reducing the disturbance of the soil body.
Drawings
FIG. 1 is a construction flow chart of a construction method of a micro-disturbance vertical press-in type thin-wall open caisson in a complex environment;
FIG. 2 is a cross-sectional view of the construction process of the micro-disturbance vertical press-in type thin-wall open caisson of the present invention (the secant pile is used as an isolation pile, the open caisson sinks with water, and a soil match is left in the open caisson);
FIG. 3 is a schematic diagram of the construction of a micro-disturbance vertical press-in type thin-wall open caisson of the invention;
FIG. 4 is a schematic diagram of the micro-disturbance vertical press-in type thin-walled well sinking force of the present invention;
fig. 5 is a schematic diagram of the connection between the underwater bottom-sealed rear snap pile and the open caisson after the micro-disturbance vertical press-in type thin-wall open caisson is sunk in place.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1 to 5, the construction method of the vertical press-in type thin-walled open caisson under the complex environment comprises the steps of firstly, driving a circle of secant pile 2 along the outer side of the open caisson (the depth is slightly lower than the elevation of a blade foot), integrally connecting the tops of the secant pile 2 through a ring beam to provide a press-down counter force, arranging a plurality of ground anchor counter force devices, providing downward pulling force through a penetrating jack, applying pressure to a steel bracket 6 on the wall of the caisson by the jack to generate the press-down force on the open caisson, driving water 5 in the open caisson to sink, leaving a soil sample 4 in the open caisson, and pressing the thin-walled open caisson into a soil body while properly taking out the soil. The bitten pile 2 also serves as a separation retaining wall for reducing the environmental impact during subsidence.
The counter-force anchor is a plurality of steel strands, can be flexibly adjusted according to the sinking depth, provides enough pressure for sinking, is more convenient to operate and ensures the sinking speed; the jack steel strand combination device is double-sleeve, can synchronously correct the deviation, can also independently correct the deviation according to the actual condition, and realizes remote control on the open caisson sinking jack through a PLC system, and timely masters the stroke displacement, the oil pressure and the related equipment condition. The bracket 6, the through jack, the steel strand 7, the ring beam, the secant pile 2 and the like form a complete pressure-sinking force transfer system, the pressure-sinking force transfer system is easy to control the attitude of the open caisson and has high precision, and the height difference of the blade foot in the sinking process and the final sinking stage is small. Vertical forced open caisson construction technology has been adopted through the pressure device, and the open caisson has possessed higher coefficient of sinking regulation space, through the coefficient of sinking of adjusting the open caisson, can improve the open caisson speed of sinking, guarantees the time limit for a project.
The whole sinking well pressure sinking stage is carried out under the condition of no water drainage (the water level in the sinking well is ensured to be higher than the underground water level), and a certain soil plug height is always kept in the sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson sinking earlier stage, middle stage and final sinking mainly adopt a mechanical soil digging mode, and a diver and a diving robot implement soil taking operation when necessary.
And after the open caisson is sunk in place, underwater bottom sealing is carried out, meanwhile, the thin-wall open caisson is effectively connected with the pile top ring beam of the secant pile, the secant pile plays a role in resisting the pile, effective anti-buoyancy force is provided to meet the anti-floating requirement of the thin-wall open caisson, and the use safety of the open caisson is ensured.
The whole sinking stage is carried out under the condition of no water drainage (the water level in the sinking well is ensured to be level with the ground), and a certain soil plug height is always kept in the sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson is mainly dug mechanically in the early stage, the middle stage and the final stage of sinking, namely, a crane and a grab bucket are adopted.
The whole sinking well pressure sinking stage is carried out under the condition of no water drainage (the water level in the sinking well is ensured to be higher than the underground water level), and a certain soil plug height is always kept in the sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson sinking earlier stage, middle stage and final sinking mainly adopt a mechanical soil digging mode, and a diver and a diving robot implement soil taking operation when necessary.
And after the open caisson is sunk in place, underwater bottom sealing is carried out, meanwhile, the thin-wall open caisson is effectively connected with the pile top ring beam of the secant pile, the secant pile plays a role in resisting the pile, effective anti-buoyancy force is provided to meet the anti-floating requirement of the thin-wall open caisson, and the use safety of the open caisson is ensured.
The whole sinking stage is carried out under the condition of no water drainage (the water level in the sinking well is ensured to be level with the ground), and a certain soil plug height is always kept in the sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson is mainly dug mechanically in the early stage, the middle stage and the final stage of sinking, namely, a crane and a grab bucket are adopted.
In the process of pressure sinking, the jack oil cylinder jacks upwards, the counterforce steel strand transmits pressure to the secant pile, and the secant pile plays a role in uplift pile.
The secant pile forms a set of enclosure system, and in the sinking process of the open caisson, the secant pile plays a role in isolating the pile, so that the disturbance of the sinking of the open caisson to the surrounding environment is reduced.
After the open caisson is sunk to a position, the secant pile 2 and the open caisson 1 (the bottom of which is provided with a concrete bottom sealing 4) are connected by adopting a connecting beam 3, as shown in figure 5, the open caisson 1 and the secant pile 2 form a whole, the secant pile increases the anti-floating force of the open caisson, and the safety of the open caisson in the using process is ensured.
And a thin-wall open caisson structure is adopted, so that the base counter force of the blade angle tread is effectively reduced, and the construction efficiency of the pressure sinking is greatly improved.
By keeping the soil plug with proper height, the pressure of the soil inside and outside the well is balanced, the slip phenomenon of the soil outside the well is greatly reduced, and the safety of surrounding buildings can be more effectively ensured.
And during sinking, the disturbance to the soil outside the open caisson is small by the remaining soil plug. The depth of the sunk well blade foot penetrating into the soil layer is deeper through a counterforce system, so that a higher soil plug is kept in the sunk well while a sufficient sinking coefficient is still provided.
Claims (10)
1. A construction method of a micro-disturbance vertical press-in type thin-wall open caisson in a complex environment is characterized in that: firstly, a circle of secant pile is arranged along the outer side of the thin-wall open caisson, the depth of the secant pile is slightly lower than the elevation of a blade foot, the top of the secant pile is connected into a whole through a ring beam to provide a pressing-down counter force, a plurality of ground anchor counter force devices are arranged, then, a penetrating jack provides downward pulling force, the jack exerts pressure on a bracket of the open caisson of the well wall, so that the pressing-down force is generated on the open caisson, and finally, the thin-wall open caisson is pressed into soil body while soil is taken.
2. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: in the process of pressure sinking, the jack cylinder jacks upwards, the counterforce steel strand transmits pressure to the secant pile, and the secant pile plays a role in uplift pile.
3. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: the secant pile forms a set of enclosure system, and in the sinking process of the open caisson, the secant pile plays a role in isolating the pile, so that the disturbance of the sinking of the open caisson to the surrounding environment is reduced.
4. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: after the open caisson is sunk to a position, the secant pile and the open caisson are connected by adopting the connecting beam, the open caisson and the secant pile form a whole, the secant pile increases the anti-floating force of the open caisson, and the safety of the open caisson in the using process is ensured.
5. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson in the complex environment according to claim 1, is characterized in that: the whole sinking well pressure sinking stage is carried out under the condition of no water drainage, and a certain soil plug height is always kept in a sinking well bin to ensure the stable water pressure inside and outside the well; the open caisson sinking earlier stage, middle stage and final sinking mainly adopt a mechanical soil digging mode, and a diver and a diving robot implement soil taking operation when necessary.
6. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: when soil is pressed into the thin-wall open caisson, soil plugs with proper height are reserved at the lower sections of the edge angles of the open caisson to balance the pressure of the soil inside and outside the open caisson, so that the slippage phenomenon of the soil outside the open caisson is greatly reduced, and the safety of surrounding building structures is more effectively ensured.
7. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: and after the open caisson is sunk in place, underwater bottom sealing is carried out, meanwhile, the thin-wall open caisson is effectively connected with the pile top ring beam of the secant pile, the secant pile plays a role in resisting the pile, effective anti-buoyancy force is provided to meet the anti-floating requirement of the thin-wall open caisson, and the use safety of the open caisson is ensured.
8. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: the counter-force anchor pulling of the ground anchor counter-force device is a plurality of strands of steel stranded wires, the counter-force anchor pulling is flexibly adjusted according to the sinking depth, sufficient pressure is provided for sinking, the operation is more convenient and faster, and the sinking speed is ensured; the depth of the sunk well blade foot penetrating into the soil layer is deeper through the ground anchor counterforce device, so that a higher soil plug is kept in the sunk well, and meanwhile, a sufficient sinking coefficient is still provided.
9. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: the jack steel strand combination device adopted by the penetrating jack is double-sleeve, can synchronously correct the deviation, can independently correct the deviation according to actual conditions, realizes remote control on the open caisson sinking jack through a PLC system, and
the travel displacement, oil pressure and relevant equipment conditions are mastered.
10. The construction method of the micro-disturbance vertical press-in type thin-wall open caisson under the complex environment according to claim 1, is characterized in that: the open caisson corbel, the through jack, the steel strand, the ring beam and the secant pile form a complete pressure-sinking force transmission system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162424A (en) * | 2022-07-05 | 2022-10-11 | 上海市基础工程集团有限公司 | Anti-floating device for open caisson and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018512A (en) * | 2014-06-13 | 2014-09-03 | 上海市基础工程集团有限公司 | Open caisson sinking construction method slightly disturbing environment |
| CN108487283A (en) * | 2018-06-27 | 2018-09-04 | 上海城建市政工程（集团）有限公司 | A kind of forced caisson sinking construction method of piled anchor |
| CN109594574A (en) * | 2018-12-12 | 2019-04-09 | 中铁十八局集团有限公司 | Large-scale push pipe open caisson reversed construction method based on the confined space |
| CN111395373A (en) * | 2020-03-31 | 2020-07-10 | 广东省建筑工程监理有限公司 | Open caisson pressure-sinking method construction method |
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- 2021-12-10 CN CN202111506985.1A patent/CN114319405A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018512A (en) * | 2014-06-13 | 2014-09-03 | 上海市基础工程集团有限公司 | Open caisson sinking construction method slightly disturbing environment |
| CN108487283A (en) * | 2018-06-27 | 2018-09-04 | 上海城建市政工程（集团）有限公司 | A kind of forced caisson sinking construction method of piled anchor |
| CN109594574A (en) * | 2018-12-12 | 2019-04-09 | 中铁十八局集团有限公司 | Large-scale push pipe open caisson reversed construction method based on the confined space |
| CN111395373A (en) * | 2020-03-31 | 2020-07-10 | 广东省建筑工程监理有限公司 | Open caisson pressure-sinking method construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162424A (en) * | 2022-07-05 | 2022-10-11 | 上海市基础工程集团有限公司 | Anti-floating device for open caisson and construction method thereof |
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