CN111364489A - Non-drainage sinking construction method of river channel treatment pipe jacking open caisson in fine sand stratum - Google Patents
Non-drainage sinking construction method of river channel treatment pipe jacking open caisson in fine sand stratum Download PDFInfo
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- CN111364489A CN111364489A CN202010209320.3A CN202010209320A CN111364489A CN 111364489 A CN111364489 A CN 111364489A CN 202010209320 A CN202010209320 A CN 202010209320A CN 111364489 A CN111364489 A CN 111364489A
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- open caisson
- sinking
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- drainage
- fine sand
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
Abstract
A non-drainage sinking construction method of a riverway treatment pipe jacking open caisson under a fine sand stratum comprises the following steps: step 1: taking out soil in the well; step 2: an external water pump and a water pumping pipe communicated with an internal water pump outside the well are placed in the well; and step 3: when the open caisson sinks to the position where the water level in the open caisson is high enough and the open caisson sinks slowly, an external drainage pump is turned on to drain the water in the open caisson to assist in sinking; and 4, step 4: regulating and controlling the open caisson to a designed elevation; and 5: and removing the outer drainage pump, filling water into the open caisson by using the inner water pump, and emptying the open caisson bottom sealing area, namely completing the non-drainage sinking construction of the pipe-jacking open caisson under the fine sand stratum. The construction method for the non-drainage sinking of the river channel treatment pipe jacking open caisson in the fine sand stratum can solve the problems that the construction cost is easy to increase and the sinking rate of the open caisson is delayed under the special condition of the fine sand stratum, and the open caisson sinking under the special condition can be realized simply, quickly and with high quality under the condition of low investment.
Description
Technical Field
The invention relates to the technical field of open caisson sinking construction, in particular to a non-drainage sinking construction method of a riverway treatment pipe-jacking open caisson in a fine sand stratum.
Background
The pipe-jacking construction technology is widely applied to the fields of domestic river sewage treatment, small water delivery tunnels, power tunnels, comprehensive pipe galleries and the like, and the pipe-jacking construction technology is mature and has high mechanization level. Compared with the traditional tunnel excavation construction method, the pipe jacking construction method has the advantages of high construction speed, small construction removal amount, low noise and small influence on the surrounding environment, is very suitable for municipal engineering, and is widely applied to urban river management engineering at present.
The pipe jacking construction needs a large number of working wells and receiving wells, for example, the pipe jacking construction of a river channel treatment project with the length of 4km is adopted, one working well and one receiving well are arranged every 150m, 52 working wells and 52 receiving wells are required on two sides of a river bank totally, the position of a river channel treatment pipe jacking open caisson is on the river bank needing river channel treatment, the general river bed of an urban river channel needing pipe jacking construction treatment is wide, a water system is developed, underground water is sufficient, the bottom of the open caisson is communicated with the river channel before a plurality of open caissons sink to the position close to a preset elevation, and drainage sinking can hardly be technically and economically realized. The sinking of the open caisson is generally carried out by adopting a non-drainage method.
Under the condition of no weight, the sinking without water drainage overcomes buoyancy, the friction force of the surrounding soil body and the counterforce of the edge foot of the sunk well by the gravity of the sunk well. If the construction method of sinking without pumping and draining water is adopted, after the open caisson sinks to a certain height, the open caisson continues to sink, the larger the friction force and the buoyancy of the soil body is, the larger the water pressure at the soil body cut by the blade foot part is, and the soil body is not easy to drop, so that the open caisson sinks difficultly and slowly, and if proper control measures are not adopted, the bottom of the open caisson is dug blindly to draw out the outer space, and quality accidents such as instant sinking, over-sinking of the open caisson and the like are caused.
The sinking is assisted to the measure that adopts the sewage pump to outwards drain, buoyancy and the pressure that water in the well when reducing the sinking include the sword foot position soil body bottom the open caisson, can let the speed of sinking resume normal, but under the special circumstances, the open caisson can touch the fine sand layer that seriously gushes water and gush sand sinking, if continue to sink with drainage assistance, the speed of sinking still can steadily control, but the concrete bottom sealing region of open caisson bottom appears the balanced phenomenon of being wrapped up in by fine sand always, under this kind of condition, continue to sink and can lead to taking place the risk that can not seal the end, stop supplementary drainage, the phenomenon that can not sink even can appear sinking the difficulty of sinking.
Under the special conditions, if measures such as water jet assisted sinking and weight pressing are used, the construction cost is increased, the sinking rate of the open caisson is delayed, and the overall construction period and cost are influenced. How to utilize the sinking mechanics principle of the open caisson, only using a water pump to finish the sinking work of the open caisson relatively quickly and in high quality, and creating conditions for one-time construction of underwater concrete bottom sealing under the open caisson is the problem considered by the invention.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for non-drainage sinking of a riverway treatment pipe jacking open caisson under a fine sand stratum, which can solve the problems that the construction cost is easy to increase and the sinking rate of the open caisson is delayed under the special condition of the fine sand stratum, and can realize the open caisson sinking under the special condition simply, quickly and with high quality under the condition of low investment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a non-drainage sinking construction method of a riverway treatment pipe jacking open caisson under a fine sand stratum comprises the following steps:
step 1: in the initial sinking stage of the open caisson, a long-arm excavator is used for taking soil in the open caisson, and the open caisson is sunk in a dry manner in a manner of digging the bottom of a pan;
step 2: an external water pump and a water pumping pipe communicated with an internal water pump outside the well are placed in the well;
and step 3: when the open caisson sinks to the position where the water level in the open caisson is high enough and the open caisson sinks slowly, an external drainage pump is turned on to drain the water in the open caisson to assist in sinking;
and 4, step 4: when the open caisson continues to sink to a fine sand layer with the blade inserted into serious gushing water and gushing sand, an internal water pump connected in advance is used for filling water into the open caisson and an external water pump is used for draining water out of the open caisson, the open caisson is matched with a long-arm excavator to dig sand and sink, and the open caisson is regulated to a designed elevation;
and 5: and removing the outer drainage pump, filling water into the open caisson by using the inner water pump, stabilizing the open caisson to prevent the open caisson from continuously sinking, and emptying the bottom sealing area of the open caisson to finish the non-drainage sinking construction of the pipe-jacking open caisson under the fine sand stratum.
The detailed steps of the step 4 are as follows:
step 4-1: closing the drainage pump, naturally raising the water level in the well, and slowly sinking the open caisson;
step 4-2: starting an inner water pump, and filling water into the well until the top pipe open caisson does not sink any more and is maintained;
step 4-3: excavating fine sand at the bottom sealing area of the open caisson by using a long-arm excavator 1, and forming a shallow pan bottom at the bottom of a blade leg;
step 4-4: starting an effluent pump to drain water to the outside of the well, wherein the open caisson can sink continuously and slowly along with the continuous drainage process, the relative position of the sediment in the open caisson is gradually lifted until the water level in the well is drained, the bottom sealing area of the open caisson is wrapped by fine sand again, and the open caisson stops sinking;
and 4-5: and (4) repeating the steps from 4-2 to 4-4 until the open caisson elevation is close to the design elevation, draining water out of the open caisson until the open caisson descends slowly, observing, controlling the water drainage amount, keeping the sinking speed of the open caisson slow, and regulating and controlling the open caisson to the design elevation.
And 4-3, observing the sinking condition of the open caisson by using a GPS measuring instrument, and measuring the excavation condition of the bottom of the open caisson by using a hanging hammer.
And 5, removing the outer drainage pump after the open caisson sinks to the designed elevation, filling water into the open caisson by using the inner water suction pump, stabilizing the open caisson to prevent the open caisson from continuing sinking, emptying a bottom sealing area of the open caisson by using a long-arm excavator, and finishing sinking construction.
The construction method for the non-drainage sinking of the river channel treatment pipe-jacking open caisson in the fine sand stratum provided by the invention fully utilizes the mechanical principle of the sinking of the open caisson, uses two recyclable water pumps to pump water in a positive and negative direction from the angles of increasing and decreasing buoyancy and water pressure, quickly and efficiently solves the sinking problem of the open caisson in special conditions (the open caisson is sunk and meets the fine sand stratum with serious water burst and sand gushing), and has low cost and obvious effect.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the construction method of the present invention.
Detailed Description
As shown in fig. 1, a non-drainage sinking construction method of a river channel treatment pipe jacking open caisson under a fine sand stratum is characterized by comprising the following steps:
step 1: in the initial sinking stage of the open caisson, a long-arm excavator 1 is used for taking soil in the open caisson, the bottom of the open caisson 2 is dug to sink in a dry mode, namely the excavated original soil body is in a drainage sinking stage, the open caisson sinks only by overcoming the friction force of the soil body 3 of the well wall and the counterforce of the blade foot, and the sinking is smooth and efficient;
step 2: an outer drainage pump 5 and a water pumping pipe communicated with an inner water pumping pump 6 outside the well are placed in the well;
and step 3: when the open caisson 2 sinks to the water level in the well and is high enough, the buoyancy force borne by the open caisson is large, the cutting falling difficulty of the soil body at the bottom of the blade foot is increased by being pressed, the open caisson sinks slowly, the water in the well is pumped outwards by opening the external drainage pump 5, and the open caisson continues to dig and sink;
and 4, step 4: when the open caisson 2 continues to sink to a fine sand layer 4 with the blade inserted into serious gushing water and sand, the open caisson is sunk under the assistance of outer drainage, a bottom sealing area 7 of the open caisson is automatically wrapped by the fine sand to maintain the balance of the well body, water is filled into the well by an inner water suction pump 6 which is connected in advance and drained out of the well by an outer drainage pump 5, the open caisson is sunk under the assistance of the long-arm excavator 1, and the open caisson is regulated to the designed elevation;
the detailed steps of the step 4 are as follows:
step 4-1: closing the drainage pump 5, naturally raising the water level in the well, and slowly sinking the open caisson 2;
step 4-2: starting the inner water pump 6, and filling water into the well until the pipe-jacking open caisson 2 does not sink any more and is maintained;
step 4-3: excavating fine sand at the bottom sealing area 7 of the open caisson by using the long-arm excavator 1, and forming a shallow pan bottom at the bottom of the blade leg;
step 4-4: starting an effluent pump 5 to drain water to the outside of the well, wherein the open caisson 2 sinks continuously and slowly along with the continuous drainage process, the relative position of silt in the open caisson is gradually lifted until the water level in the well is drained, a bottom sealing area 7 of the open caisson is wrapped by fine sand again, and the open caisson stops sinking;
and 4-5: and (4) repeating the steps from 4-2 to 4-4 until the open caisson elevation is close to the design elevation, draining water out of the open caisson until the open caisson descends slowly, observing, controlling the water drainage amount, keeping the sinking speed of the open caisson slow, and regulating and controlling the open caisson to the design elevation.
And 4-3, observing the sinking condition of the open caisson by using a GPS measuring instrument, and measuring the excavation condition of the bottom of the open caisson by using a hanging hammer.
And 5: and removing the external drainage pump 5, filling water into the open caisson by using the internal water pump 6, stabilizing the open caisson to prevent the open caisson from continuously sinking, and emptying the open caisson bottom sealing area 7, thus finishing the construction of the pipe-jacking open caisson in the fine sand stratum without drainage sinking.
And 5, removing the outer drainage pump 5 after the open caisson sinks to the designed elevation, watering the open caisson by using the inner water suction pump 6, stabilizing the open caisson to prevent the open caisson from continuing to sink, and emptying an open caisson bottom sealing area 7 by using the long-arm excavator 1 to finish sinking construction.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (4)
1. A non-drainage sinking construction method of a riverway treatment pipe jacking open caisson under a fine sand stratum is characterized by comprising the following steps:
step 1: in the initial sinking stage of the open caisson, a long-arm excavator (1) is used for taking soil in the open caisson, and the open caisson (2) is sunk in a dry mode in a manner of digging the bottom of a pan;
step 2: an outer drainage pump (5) and a water pumping pipe communicated with an inner water pumping pump (6) outside the well are placed in the well;
and step 3: when the open caisson (2) sinks to the water level in the well and the open caisson sinks slowly, an external drainage pump (5) is turned on to drain the water in the well, and sinking is assisted;
and 4, step 4: when the open caisson (2) continues to sink to a fine sand layer with the blade inserted into serious gushing water and gushing sand, an internal water pump (6) connected in advance is used for filling water into the open caisson and an external water pump (5) is used for draining water out of the open caisson, the open caisson is matched with the auxiliary long-arm excavator (1) to dig sand and sink, and the open caisson is regulated to the designed elevation;
and 5: and removing the external drainage pump (5), filling water into the open caisson by using the internal water pump (6), stabilizing the open caisson to prevent the open caisson from continuously sinking, and emptying the open caisson bottom sealing area (7), namely finishing the non-drainage sinking construction of the pipe-jacking open caisson in the fine sand stratum.
2. The non-drainage sinking construction method of the riverway treatment pipe-jacking open caisson in the fine sand stratum according to claim 1, which is characterized in that the detailed steps in the step 4 are as follows:
step 4-1: closing the drainage pump (5), naturally raising the water level in the well, and slowly sinking the open caisson (2);
step 4-2: starting an inner water pump (6), and filling water into the well until the pipe-jacking open caisson (2) does not sink any more and is maintained;
step 4-3: excavating fine sand at the bottom sealing area (7) of the open caisson by using a long-arm excavator (1), and forming a shallow pan bottom at the bottom of the blade leg;
step 4-4: starting an effluent pump (5) to drain water to the outside of the well, wherein the open caisson (2) sinks continuously and slowly along with the continuous drainage process, the relative position of the sediment in the open caisson is gradually lifted until the water level in the well is drained, a bottom sealing area (7) of the open caisson is wrapped by fine sand again, and the open caisson stops sinking;
and 4-5: and (4) repeating the steps from 4-2 to 4-4 until the open caisson elevation is close to the design elevation, draining water out of the open caisson until the open caisson descends slowly, observing, controlling the water drainage amount, keeping the sinking speed of the open caisson slow, and regulating and controlling the open caisson to the design elevation.
3. The non-drainage sinking construction method of the riverway treatment pipe-jacking open caisson in the fine sand stratum according to claim 2, which is characterized in that: and 4-3, observing the sinking condition of the open caisson by using a GPS measuring instrument, and measuring the excavation condition of the bottom of the open caisson by using a hanging hammer.
4. The non-drainage sinking construction method of the riverway treatment pipe-jacking open caisson in the fine sand stratum according to claim 1, which is characterized in that: and 5, removing the outer drainage pump (5) after the open caisson sinks to the designed elevation, watering the open caisson by using the inner water pump (6), stabilizing the open caisson to prevent the open caisson from continuing to sink, and emptying the open caisson bottom sealing area (7) by using the long-arm excavator (1) to finish sinking construction.
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| CN202010209320.3A CN111364489A (en) | 2020-03-23 | 2020-03-23 | Non-drainage sinking construction method of river channel treatment pipe jacking open caisson in fine sand stratum |
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| CN202010209320.3A CN111364489A (en) | 2020-03-23 | 2020-03-23 | Non-drainage sinking construction method of river channel treatment pipe jacking open caisson in fine sand stratum |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622445A (en) * | 2021-09-01 | 2021-11-09 | 安徽地矿建设工程有限责任公司 | Controllable differential pressure open caisson method in tailing warehouse |
| CN113718810A (en) * | 2021-07-24 | 2021-11-30 | 泉州市华泰建设工程有限公司 | Sinking-assisting construction method for open caisson |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5826122A (en) * | 1981-08-07 | 1983-02-16 | Nissan Furiizu Kk | Settlement of open caisson |
| CN102454167A (en) * | 2010-10-21 | 2012-05-16 | 五冶集团上海有限公司 | Construction method for large ultra-deep well |
| CN203213131U (en) * | 2013-04-12 | 2013-09-25 | 鲲鹏建设集团有限公司 | Open caisson combining water drainage sinking and water-drainage-free sinking |
| CN106088126A (en) * | 2016-06-30 | 2016-11-09 | 中国五冶集团有限公司 | A kind of open caisson deviation rectification construction method |
| CN107829441A (en) * | 2016-09-15 | 2018-03-23 | 邹宗煊 | It is a kind of do not influence surrounding enviroment draw hole caisson structure and its construction method |
| CN108824505A (en) * | 2018-07-11 | 2018-11-16 | 上海市政建设有限公司 | A kind of short distance open caisson group's sinking construction method |
-
2020
- 2020-03-23 CN CN202010209320.3A patent/CN111364489A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5826122A (en) * | 1981-08-07 | 1983-02-16 | Nissan Furiizu Kk | Settlement of open caisson |
| CN102454167A (en) * | 2010-10-21 | 2012-05-16 | 五冶集团上海有限公司 | Construction method for large ultra-deep well |
| CN203213131U (en) * | 2013-04-12 | 2013-09-25 | 鲲鹏建设集团有限公司 | Open caisson combining water drainage sinking and water-drainage-free sinking |
| CN106088126A (en) * | 2016-06-30 | 2016-11-09 | 中国五冶集团有限公司 | A kind of open caisson deviation rectification construction method |
| CN107829441A (en) * | 2016-09-15 | 2018-03-23 | 邹宗煊 | It is a kind of do not influence surrounding enviroment draw hole caisson structure and its construction method |
| CN108824505A (en) * | 2018-07-11 | 2018-11-16 | 上海市政建设有限公司 | A kind of short distance open caisson group's sinking construction method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718810A (en) * | 2021-07-24 | 2021-11-30 | 泉州市华泰建设工程有限公司 | Sinking-assisting construction method for open caisson |
| CN113622445A (en) * | 2021-09-01 | 2021-11-09 | 安徽地矿建设工程有限责任公司 | Controllable differential pressure open caisson method in tailing warehouse |
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Application publication date: 20200703 |