CN110863486A - MJS pile forming quality auxiliary method based on mud discharging volume real-time monitoring - Google Patents
MJS pile forming quality auxiliary method based on mud discharging volume real-time monitoring Download PDFInfo
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- CN110863486A CN110863486A CN201911120652.8A CN201911120652A CN110863486A CN 110863486 A CN110863486 A CN 110863486A CN 201911120652 A CN201911120652 A CN 201911120652A CN 110863486 A CN110863486 A CN 110863486A
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- pile
- discharge volume
- forming quality
- sludge discharge
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to an MJS pile forming quality auxiliary method based on sludge discharge volume real-time monitoring. Compared with the prior art, the invention has the advantages of real-time monitoring, pile forming quality guarantee, suitability for faults of a formation pressure sensor and the like.
Description
Technical Field
The invention relates to the field of pile foundation construction, in particular to an MJS pile forming quality auxiliary method based on sludge discharge volume real-time monitoring.
Background
In the construction of pile foundations, an omnibearing high-pressure Jet grouting method (Metro Jet System-MJS method) is a construction method with wide application. The MJS construction method adopts a unique perforated pipe and a front end generating device on the basis of the traditional high-pressure jet grouting process, and realizes the forced slurry discharge in the hole and the monitoring of the underground pressure. By adjusting the internal pressure of the forced slurry discharge quantity control, the deformation of the ground surface caused by jet stirring can be effectively controlled, and the influence on the surrounding environment is greatly reduced. In addition, the MJS method is widely used because it can perform all-dimensional construction such as horizontal, oblique, and vertical construction, and can arbitrarily select a shape of a reinforcing body.
However, in the actual construction process, the formation pressure sensor installed at the front end of the perforated pipe often fails, which results in failure of main control parameters such as formation pressure and the like, and the pile forming quality cannot be ensured. More seriously, the problem is often difficult to find in time, and the quality of the reinforced soil can be detected only by means of later-stage sampling and coring and the like, so that the construction period is delayed, the continuity of the pile during the re-reinforcement is seriously damaged, the integral strength of the pile foundation is weakened, and the equipment in the re-spraying process is likely to have faults again.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an MJS pile forming quality auxiliary method based on sludge discharge volume real-time monitoring.
The purpose of the invention can be realized by the following technical scheme:
an MJS pile forming quality auxiliary method based on real-time monitoring of mud discharge volume is characterized in that a flowmeter is additionally arranged in a mud return pipeline of an MJS pile forming device, the mud discharge volume is detected in real time, and the mud discharge volume is used as an auxiliary control parameter to control pile forming quality.
The flowmeter is arranged at the adjacent position of the pressure recorder in the slurry return pipeline.
The mud discharging volume is a stable value under the set soil layer, burial depth and specified pile-forming quality requirements, namely, the mud discharging volume is kept within a certain range when the construction conditions and the pile-forming quality requirements are kept unchanged.
And determining various control parameters under the optimal piling quality condition through a test pile before formal construction, wherein the control parameters specifically comprise stratum pressure, lifting speed and mud discharge volume.
In the control parameters, the formation pressure and the lifting speed are used as main control parameters, the sludge discharge volume is used as an auxiliary control parameter, the sludge discharge volume is used for verifying the pile forming quality, and when the reading of the sludge discharge volume is abnormal, the main control parameters and related equipment are determined to be in fault.
In the MJS pile forming process, when the reinforcing range and the cement slurry amount change due to the out-of-control underground pressure, the mud discharge volume reading detected by the flow meter in real time changes abnormally, so that an operator is reminded to recheck the pile forming effect, repair reinforcing equipment and perform troubleshooting, and the effect of assisting in controlling the pile forming quality is achieved.
The flowmeter is a plug-in electromagnetic flowmeter.
When the stratum is mainly soft clay, the pile diameter is 2.4m, the pile length is 30m, the local internal pressure is 1.3-1.6, the lifting speed is 40min/m, the cement consumption is about 5t/m, and the slurry flow is about 130L/min, the pile-forming quality meets the design requirement, and the sludge discharge volume is 130-150 m3Within the range.
Compared with the prior art, the invention has the following advantages:
practice proves that under the conditions of specific soil layer, burial depth and specified pile-forming quality requirement, the mud discharge volume of the mud return pipeline is a stable numerical value, the mud discharge volume is used as an auxiliary control parameter to assist in monitoring pile-forming quality, when the reading of the mud discharge volume is abnormal, an operator can be timely reminded to recheck pile-forming effect, overhaul reinforcing equipment and perform fault troubleshooting, therefore, the improved method is additionally provided with a flowmeter in the original MJS device, can monitor the mud discharge volume of the mud return pipeline in real time, realizes the auxiliary control of the pile-forming quality, gives an alarm in time when a formation pressure sensor fails, and has remarkable effect on ensuring the pile-forming quality.
Drawings
Fig. 1 is a schematic structural diagram of an improved MJS device of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the conventional MJS device is composed of a construction host, a pressure monitor, a perforated pipe, a mud pipe, a pressure sensor, a mud tank, and the like. In the construction of the existing MJS construction method, high-pressure cement slurry is sprayed to a soil body to be reinforced through a porous pipe in a rotating mode to form a reinforced body. Meanwhile, in order to balance the pressure of the earth's internal mud, it is necessary to actively discharge the excess mud. The redundant mud is actively collected through a mud discharging port at the end part of the mud discharging pipe, and flows through the mud discharging pipe to enter a mud box for mud treatment. During construction, the pressure sensor at the end of the porous pipe is used for monitoring the pressure in the ground in real time so as to ensure the pressure of the mud in the ground to be stable. The flow meter is additionally arranged in the sludge discharge pipe, so that the sludge discharge volume can be monitored in real time, and the volume can be used as an auxiliary parameter for monitoring the pressure stability of the underground slurry.
The existing MJS construction method comprises the processes of pile testing, drilling of a drill rod, inclination measurement, pile forming, pressure monitoring, drill rod recovery and the like. Compared with other pile-forming methods, the MJS construction method has an important advantage that the MJS construction method can control the stability of the underground pressure and effectively reduce the influence of construction on the surrounding soil body. In the conventional MJS construction method, only an underground pressure monitoring value is used as the judgment of whether construction is normal or not. When the monitoring value of the local internal pressure is abnormal, the construction is continued after the pressure is adjusted to ensure that the monitoring value is normal. The invention adds a sludge discharge volume monitoring step in the process. The mud discharging volume monitoring and the underground pressure monitoring are carried out simultaneously, when the monitoring value of the underground pressure is normal and the monitoring value of the mud discharging volume is abnormal, the possibility that the pressure sensor fails exists, equipment needs to be overhauled, faults need to be eliminated, and construction can be continued only when the monitoring values of the underground pressure and the mud discharging volume are normal.
In specific implementation, parameters such as the underground pressure, the lifting speed, the mud discharging volume and the like are determined through a pile testing process before formal construction, and the parameters are used as control parameters of the formal construction. The MJS pile construction in the above sea subway station engineering is taken as an example: the stratum where the project is located is mainly soft clay, and the pile diameter is designed to be 2.4m and the pile length is designed to be 30 m. When the pile test determines that the local internal pressure is 1.3-1.6, the lifting speed is 40min/m, the cement consumption is about 5t/m, and the slurry flow is about 130L/min, the pile forming quality is good, and the design requirement is met. At the moment, the volume of the discharged mud is kept within the range of 130-150 m ^ 3. Therefore, under the conditions of a specific soil layer, burial depth and specified pile-forming quality requirements, the mud discharge volume is a stable numerical value. In the subsequent formal pile-forming construction, a construction unit takes the mud discharge volume as an auxiliary control parameter of the underground pressure for construction, and the quality of the pile-forming is verified to be qualified through sampling and coring detection after the construction is finished. The concrete example proves that the improved method adds an inserted electromagnetic flowmeter in the original MJS device, monitors the mud discharge volume of the mud return pipeline in real time, realizes the auxiliary control of the pile-forming quality and has obvious effect on ensuring the pile-forming quality.
Examples
Practice proves that under the conditions of a specific soil layer, burial depth and specified pile-forming quality requirements, the mud discharge volume of the mud return pipeline is a stable numerical value and can be used as an auxiliary control parameter to assist in monitoring pile-forming quality, and when the reading of the mud discharge volume is abnormal, an operator can be timely reminded to recheck pile-forming effect, repair and reinforce equipment and perform troubleshooting.
Therefore, the improved method adds a flowmeter in the original MJS device, can monitor the mud discharge volume of the mud return pipeline in real time, thereby realizing the auxiliary control of the pile-forming quality, giving an alarm in time when the formation pressure sensor fails, and having remarkable effect on ensuring the pile-forming quality.
As shown in figure 2, the invention provides an MJS pile forming quality auxiliary method taking sludge discharge volume real-time monitoring as a means, which is characterized in that a flowmeter is additionally arranged in a slurry return pipeline of the original MJS pile forming device to monitor the sludge discharge volume in real time, and the pile forming quality is assisted and controlled by the auxiliary parameter of the sludge discharge volume.
As a preferred example, the flowmeter is arranged in the slurry return pipeline and is arranged adjacent to the original pressure recorder.
The flowmeter is responsible for monitoring the mud discharge volume of the mud return pipeline in real time, and the pile forming quality is controlled by the aid of the auxiliary parameter of the mud discharge volume.
The auxiliary parameter mud discharging volume is a more stable parameter which is proved by engineering practice under the conditions of specific soil layer, burial depth and specified pile-forming quality requirement, namely, the mud discharging volume is basically kept unchanged when the construction condition and the pile-forming quality requirement are kept unchanged.
The auxiliary parameter mud discharging volume is determined by a pile testing link before formal construction. During pile testing, determining various control parameters under the condition of optimal pile forming quality, wherein the control parameters comprise: formation pressure, lift rate, mud discharge volume, etc.
In the control parameters, the formation pressure and the lifting speed are used as main control parameters, and the sludge discharge volume is used as an auxiliary control parameter. The mud discharging volume is used for verifying the pile forming quality, and when the mud discharging volume degree is abnormal, the main control parameters and related equipment can be considered to be in failure, and the equipment needs to be shut down and overhauled in time.
The alternative control function means that in the MJS pile forming process, if a formation pressure sensor fails, real in-ground pressure cannot be obtained, and the pile forming effect is difficult to control through parameters such as formation pressure or lifting speed. After the flowmeter is added, once the reinforcing range and the cement slurry amount are changed due to the out-of-control underground pressure, the reading of the mud discharging volume is correspondingly changed abnormally, and at the moment, an operator can be timely reminded to recheck the pile forming effect, repair the reinforcing equipment and perform fault troubleshooting, so that the effect of assisting in controlling the pile forming quality is achieved.
Claims (8)
1. An MJS pile forming quality auxiliary method based on real-time monitoring of mud discharge volume is characterized in that a flowmeter is additionally arranged in a mud return pipeline of an MJS pile forming device, the mud discharge volume is detected in real time, and the mud discharge volume is used as an auxiliary control parameter to control pile forming quality.
2. The MJS pile-forming quality auxiliary method based on sludge discharge volume real-time monitoring is characterized in that the flow meter is installed in a position adjacent to a pressure recorder in a slurry return pipeline.
3. The MJS pile-forming quality auxiliary method based on the sludge discharge volume real-time monitoring is characterized in that the sludge discharge volume is a stable value under the set soil layer, burial depth and the designated pile-forming quality requirement, namely the sludge discharge volume is kept in a certain range when the construction condition and the pile-forming quality requirement are kept unchanged.
4. The MJS pile-forming quality auxiliary method based on sludge discharge volume real-time monitoring is characterized in that various control parameters under the optimal pile-forming quality condition are determined through pile testing before formal construction, and the parameters specifically comprise formation pressure, lifting speed and sludge discharge volume.
5. The MJS pile forming method based on the real-time monitoring of the sludge discharge volume as recited in claim 4, wherein the control parameters include formation pressure and lifting speed as main control parameters, the sludge discharge volume as auxiliary control parameters, the sludge discharge volume is used for verifying pile forming quality, and the main control parameters and related equipment are determined to have faults when the sludge discharge volume is abnormally read.
6. The MJS pile-forming quality auxiliary method based on the sludge discharge volume real-time monitoring is characterized in that in the MJS pile-forming process, when the reinforcement range and the cement slurry amount change due to the out-of-control of the underground pressure, the sludge discharge volume reading detected by the flowmeter in real time changes abnormally, so that an operator is reminded to recheck the pile-forming effect, repair reinforcement equipment and perform troubleshooting, and the effect of auxiliary pile-forming quality control is achieved.
7. The MJS pile-forming quality auxiliary method based on sludge discharge volume real-time monitoring is characterized in that the flowmeter is an insertion type electromagnetic flowmeter.
8. The MJS pile forming quality auxiliary method based on sludge discharge volume real-time monitoring as claimed in claim 3, wherein when the stratum is mainly soft clay, the pile diameter is 2.4m, the pile length is 30m, the local internal pressure is 1.3-1.6, the lifting speed is 40min/m, the cement consumption is about 5t/m, and the grout is usedWhen the flow is about 130L/min, the pile forming quality meets the design requirement, and the mud discharge volume at the moment is 130-150 m3Within the range.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911120652.8A CN110863486A (en) | 2019-11-15 | 2019-11-15 | MJS pile forming quality auxiliary method based on mud discharging volume real-time monitoring |
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| CN201911120652.8A CN110863486A (en) | 2019-11-15 | 2019-11-15 | MJS pile forming quality auxiliary method based on mud discharging volume real-time monitoring |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096838A (en) * | 1993-06-22 | 1994-12-28 | 中志朗 | Comprehensive ground modified body construction method and device thereof |
| JP2001030624A (en) * | 1999-07-16 | 2001-02-06 | Ricoh Co Ltd | Method and device for recording |
| CN209260776U (en) * | 2018-11-03 | 2019-08-16 | 上海隧道工程有限公司 | Multifunctional high pressure jet grouting pile construction monitoring device |
| CN110185035A (en) * | 2019-05-31 | 2019-08-30 | 武汉江钻恒立工程钻具股份有限公司 | A kind of pile making method of the MJS engineering method suitable for hardpan |
| CN110318401A (en) * | 2019-06-05 | 2019-10-11 | 中铁七局集团有限公司 | Suitable for the construction method to open cut area large size pipeline in-situ conservation and pattern foundation pit supporting structure |
-
2019
- 2019-11-15 CN CN201911120652.8A patent/CN110863486A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096838A (en) * | 1993-06-22 | 1994-12-28 | 中志朗 | Comprehensive ground modified body construction method and device thereof |
| US5401121A (en) * | 1993-06-22 | 1995-03-28 | N.I.T. Co., Ltd. | All-around type reinforcing and consolidating method in the ground and apparatus thereof |
| JP2001030624A (en) * | 1999-07-16 | 2001-02-06 | Ricoh Co Ltd | Method and device for recording |
| CN209260776U (en) * | 2018-11-03 | 2019-08-16 | 上海隧道工程有限公司 | Multifunctional high pressure jet grouting pile construction monitoring device |
| CN110185035A (en) * | 2019-05-31 | 2019-08-30 | 武汉江钻恒立工程钻具股份有限公司 | A kind of pile making method of the MJS engineering method suitable for hardpan |
| CN110318401A (en) * | 2019-06-05 | 2019-10-11 | 中铁七局集团有限公司 | Suitable for the construction method to open cut area large size pipeline in-situ conservation and pattern foundation pit supporting structure |
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Application publication date: 20200306 |