CN117146889A - Originating well deformation monitoring device and method in large-diameter pipe jacking construction - Google Patents
Originating well deformation monitoring device and method in large-diameter pipe jacking construction Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 147
- 239000002689 soil Substances 0.000 claims abstract description 96
- 230000008569 process Effects 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011148 porous material Substances 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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 discloses a deformation monitoring device and method for an originating well in large-diameter pipe jacking construction, and belongs to the technical field of underground pipeline engineering; monitoring jacking force in the construction process, monitoring deformation of side wall bodies before and after a working well, monitoring deformation of soil body of a rear seat of the working well and monitoring underground pore water pressure; according to the characteristics of long jacking distance of the large-diameter jacking pipe, large contact area between the periphery of the pipe and the soil body, large facing area of the jacking pipe machine and the like, the jacking force, deformation of side wall bodies before and after a working well, deformation of soil bodies of a rear seat of the working well and underground pore water pressure are monitored in real time in the whole construction process, so that the problems of instability of the soil bodies of the rear seat of the well and deformation of the soil bodies of the rear seat under the action of the jacking force are prevented; the method avoids the lack of monitoring the structure of the push pipe starting well and the soil body of the rear seat thereof in the push pipe jacking construction process, and eliminates the safety blind area in the engineering construction process.
Description
Technical Field
The invention belongs to the technical field of underground pipeline engineering, and particularly relates to an originating well deformation monitoring device and method in large-diameter pipe jacking construction.
Background
The existing pipe jacking engineering is generally constructed by adopting a mode of an originating well and a receiving well, namely, a pipe jacking originating well with a certain depth is arranged at a certain position of a pipe jacking axis, a receiving well is arranged at the other side, and after jacking from the originating well to the receiving well, a pipe jacking machine head is taken out, so that the construction of the whole underground engineering can be completed. According to the existing technical standard requirements of GB 50268-2008 'water supply and drainage pipeline engineering construction and acceptance inspection and acceptance Specification', CECS 246-2008 'water supply and drainage engineering pipe jacking technical Specification', and the like, in the pipe jacking construction process, the ground subsidence caused by pipe jacking construction and the subsidence, displacement and damage of a ground building are required to be monitored. The specification of CECS 246-2008 'technical regulations for pipe jacking of Water supply and drainage engineering' is as follows:
1. the scope of construction monitoring should include both above ground and below ground. Above ground, ground settlement and settlement, displacement and damage of ground buildings should be monitored. Underground structures, various underground pipelines, sedimentation, horizontal displacement, water leakage and air leakage in the disturbance range of the jacking pipe should be monitored below the ground.
2. Construction monitoring is focused on neighboring buildings (structures), banks, and underground pipelines and other important facilities that may cause serious consequences.
3. When the monitoring point is set, various factors that may have an impact on it should be avoided to ensure that it is not damaged.
4. Observing the cracks should record the production time of the ground and structural cracks, the length and width development of the cracks.
5. All monitoring points must be buried and arranged before pipe jacking construction begins.
6. The observation points should be measured at regular time, and the measured data should be continuous, real and reliable.
Regarding monitoring of jacking pipes, a first engineering limited company of a middle-iron twenty-office group proposes a 'comprehensive pipe gallery large-section rectangular jacking pipe construction stress monitoring system' (ZL 2018 2 1025731), and the patent discloses a comprehensive pipe gallery large-section rectangular jacking pipe construction stress monitoring system, which comprises a stress monitoring system and a plurality of soil pressure monitoring devices arranged on rectangular jacking pipe joints for jacking pipe construction of the comprehensive pipe gallery, wherein the soil pressure monitoring devices are distributed from front to back along the length direction of the rectangular jacking pipe joints; each soil pressure monitoring device comprises a plurality of adjustable soil pressure detection devices which are distributed on the same cross section of the rectangular pipe-jacking pipe joint, and each adjustable soil pressure detection device comprises an outer base, an inner base which is coaxially sleeved in the outer base and can move up and down, and a soil pressure gauge which is arranged in the inner base. The stress of the large-section rectangular pipe-jacking pipe joint can be monitored.
The invention provides a technology of ZL 2020 1 1450153, and provides a comprehensive pipe gallery large-section rectangular pipe jacking construction stress monitoring system, which relates to the technical field of pipe jacking construction and comprises rectangular pipe jacking joints, a pressure detection mechanism and an air pressure control mechanism, wherein a rectangular cabin is arranged in each rectangular pipe jacking joint, the air pressure control mechanism is positioned in the rectangular cabin, and a compression cabin is arranged at the top end of each rectangular pipe jacking joint. The invention realizes the up-and-down lifting movement of the soil pressure gauge and can effectively protect the soil pressure gauge.
According to the prior engineering experience, and searching published documents, patents, monographs and the like, no special monitoring technical scheme and monitoring system exist for monitoring the stress and deformation of the originating well.
For monitoring a pipe-jacking starting well, the pipe-jacking starting well is still used as an underground engineering or foundation pit engineering in the construction process of the well in engineering at present, and the monitoring of a project to be tested of the foundation pit engineering is carried out according to the requirements of GB 50497-2019 building foundation pit engineering monitoring technical standard. And after pouring of the lining wall in the foundation pit is completed, monitoring is not performed any more. In particular, in the pipe jacking construction process, the stress of the well structure is hardly monitored.
Referring to a monitoring scheme of a certain DN3000 pipe-jacking starting well, the arrangement mainly considers the process requirement of well construction, the monitoring mainly comprises the deformation of soil mass, groundwater and surrounding stratum around the well, and the structure of the well body cannot be related.
Fig. 1 and 2 are plan layout diagrams of a top pipe originating well monitoring scheme respectively constructed by adopting a sunk well method and constructed by adopting an open cut forward method, and as can be seen from the diagrams, the monitoring of the well is mainly the safety of guard piles or surrounding soil bodies. In addition, monitoring of the jacking construction process of the jacking pipe is not involved.
For the safety of the jacking pipe jacking process, the safety is calculated and determined by a static balance mode according to the specification of CECS 137 2015, reinforced concrete open caisson structure design rule of water supply and drainage engineering, 6.3.6.
The monitoring of the existing pipe-jacking starting well is focused on the influence of well construction on the surrounding environment, and comprises deformation of adjacent soil bodies, change of underground water level, deformation of pile protection around the well and the like.
For a large-caliber pipe jacking, the circumference of a pipeline is longer, along with the increase of a jacking interval, the maximum resistance provided by a pipe jacking rear seat wall and a rear soil body thereof is often exceeded, the common jacking force in the engineering at present is more than 20000kN, and the resistance provided by the soil body stability of the rear seat wall is often used as a control factor for restricting the construction operation of the long-distance large-caliber pipe jacking.
Considering the discrete type of the soil body, under the repeated loading and unloading actions of large jacking force, the strength of the soil body of the rear seat wall of the jacking pipe is possibly smaller than the physical and mechanical properties of undisturbed soil in the investigation stage, so that the overload of a well structure or the overrun of the structure use state caused by the deformation of the soil body of the rear seat exceeding the design allowable value is caused, and the scientific use of the large-caliber jacking pipe engineering is influenced.
On the other hand, by adopting the existing foundation pit monitoring technology, the originating well is monitored in the jacking construction stage of the jacking pipe, and certain defects still exist, such as incapability of knowing the magnitude of the counter force acting on the rear seat wall, incapability of reflecting the soil deformation of the jacking pipe jacking process, the pipe-stopping and discharging process and the reloading process.
The underground engineering construction process adopts a dynamic design method, namely, the actual states of the soil body and the underground building engineering in the construction process are monitored and fed back on site to guide the construction. In the large-caliber pipe jacking, dynamic design is achieved for the excavation operation construction of the originating well and the jacking construction of the pipeline, but the state monitoring of the originating well and the surrounding soil body becomes a blind area only in the pipe jacking construction process, so that potential safety hazards exist in engineering construction.
Therefore, the large-diameter jacking pipe has the characteristics of long jacking distance, large contact area between the periphery of the pipe and the soil body, large facing area of the pipe jacking machine and the like, and compared with the existing pipe network engineering jacking pipe, the following problems exist:
(1) In the jacking process of the large-diameter jacking pipe, the jacking force of the large-diameter jacking pipe against the head-on resistance and the friction resistance of the pipe circumference side of the jacking pipe is often larger, and the soil body of the well rear seat under the action of the jacking force is possibly unstable.
(2) The jacking construction process loads the soil body of the back seat wall, when the lower pipe joint is arranged, the jack is recovered, and the soil body of the back seat wall of the jacking pipe originating well is circularly loaded and unloaded, so that even if the soil body is not unstable, the soil body strength is reduced, and the problem of overlarge deformation of the back seat soil body is caused.
(3) In the existing pipe jacking construction process, the construction process of a pipe jacking well, ground subsidence in the jacking process of the pipe jacking and convergence monitoring in a tunnel are considered, and a safety blind area exists in the engineering construction process in a monitoring system of a pipe jacking starting well structure and a rear seat soil body in the pipe jacking construction process only lack.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a deformation monitoring device and method for an originating well in large-diameter pipe jacking construction, which aim at the dead zone which exists on the influence of the existing large-diameter pipe jacking construction on the surrounding environment, and monitor the deformation of the structure of the originating well of the pipe jacking and the soil body of a rear seat wall thereof in the pipe jacking construction process.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
The pressure monitoring device is connected to a jack arranged in the jacking pipe starting well and used for pushing a jacking pipe joint, and is used for monitoring the pressure of the jack so as to obtain the total jacking force acting on the jacking pipe joint in the construction process;
arranging a plurality of monitoring points at the top of the pipe-jacking starting well, and arranging displacement monitoring devices at the monitoring points, wherein the displacement monitoring devices are used for monitoring horizontal displacements in the x direction and the y direction at a plurality of points on the wall top of the pipe-jacking starting well in the construction process;
a deep soil displacement monitoring hole is formed in the soil body of the rear seat of the originating well and is closely attached to the outer wall of the originating well of the jacking pipe, and a displacement monitoring device is arranged in the deep soil displacement monitoring hole so as to monitor the deformation of the soil body of the rear seat of the working well in real time in the construction process;
the method comprises the steps of arranging a backseat pore water pressure monitoring hole in a backseat soil body of an originating well, and arranging a pressure detection device in the backseat pore water pressure monitoring hole for monitoring the water pressure in the backseat soil body of the originating well.
Further, eight monitoring points are arranged at the top of the pipe-jacking starting well and are respectively positioned at four top corners of the well head and at the centers of four sides of the well head.
Still further, one side of each monitoring point is provided with a settlement observation point.
Further, three deep soil displacement monitoring holes are formed in total, and the three deep soil displacement monitoring holes are respectively formed in positions corresponding to the center of the well wall and edges of two side walls of the well.
Furthermore, the bottom of the deep soil displacement monitoring hole exceeds the lower end of the working well supporting structure.
Furthermore, 1-2 backseat pore water pressure monitoring holes are arranged in the soil body of the backseat of the originating well in the influence range behind the originating well of the jacking pipe.
An originating well deformation monitoring method based on an originating well deformation monitoring device in large-diameter pipe jacking construction comprises the steps of monitoring jacking force, monitoring deformation of side wall bodies before and after a working well, monitoring deformation of soil bodies at a rear seat of the working well and monitoring underground pore water pressure in the construction process;
and (3) monitoring the jacking force: recording the pressure of a jack cylinder in a jacking pipe starting well in real time to obtain the jacking force of jacking construction of the jacking pipe;
and the deformation monitoring of the front and rear side wall bodies of the working well is carried out: monitoring the horizontal displacement and sedimentation conditions of each monitoring point in the construction process, namely the displacement in the x direction and the y direction of the monitoring point;
the deformation monitoring of the soil body of the rear seat of the working well: measuring deformation of the working well back seat soil body at the position of the deep soil body displacement monitoring hole, and determining the horizontal deformation amount of the working well back seat soil body and the deep soil body deformation rule through measurement at different stages in the construction process;
the underground pore water pressure monitoring: the water pressure in the pore water pressure monitoring hole of the rear seat is detected and used for monitoring the water pressure in the rear seat.
Preferably, an optical fiber measurement mode is adopted to monitor the real-time deformation condition of the rear seat soil body in the pipe jacking construction process, so as to deduce the stress state of the originating well.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention monitors the stress and deformation of the well structure and the deformation of the wall body of the back seat of the original well in the jacking construction process of the jacking pipe, is suitable for monitoring the large-caliber jacking pipe original well in the construction process, and fills the blank in the technical field of the prior engineering.
(2) The system is monitored by four parts, namely, jacking force monitoring, front and rear side wall body deformation monitoring of the working well, soil body deformation monitoring of a rear seat of the working well and underground pore water pressure monitoring; and all are based on the existing engineering conditions, so that excessive equipment and monitoring difficulty are not increased.
(3) The monitoring data are used for evaluating the integral deformation of the working well, the deformation of the soil body of the rear seat of the working well, the change of pore water pressure and the like, and the accuracy is high.
Drawings
FIG. 1 is a plan layout view of an existing pipe-jacking initiation well monitoring scheme constructed by adopting an open caisson method.
Fig. 2 is a plan layout view of an existing pipe-jacking initiation well monitoring scheme constructed using open cut forward construction.
FIG. 3 is a plan view of the originating well structure and backseat wall soil deformation monitoring apparatus of the present invention.
Fig. 4 is a cross-sectional view of fig. 3.
In the figure, a 1-pipe jacking starting well; 2-jacking pipe joints; 3-jacking pipes of adjacent sections; 4-the back side wall of the originating well; 5-a rear seat wall in the pipe-jacking starting well; 6-jack; 7-originating well backseat soil; 8-deep soil displacement monitoring holes; 9-monitoring points; 10-sedimentation observation points; 11-a backseat pore water pressure monitoring hole; 12-ground.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Referring to fig. 3 and 4, a plan view and a sectional view of an originating well structure and a back seat wall soil deformation monitoring device are shown. The embodiment provides an originating well deformation monitoring device in large-diameter pipe jacking construction; in the figure, a rear side well wall 4 of an originating well in a jacking pipe originating well 1 is provided with a rear seat wall 5 in the jacking pipe originating well; three groups of jacks 6 are connected with a rear seat wall 5 in the jacking pipe starting well; the output end of the jack 6 is connected with the jacking pipe joint 2; a pressure sensor is connected to the jack 6 for monitoring the pressure of the jack 6; 3 is a jacking pipe of the adjacent section; eight monitoring points 9 are uniformly distributed on the top of the originating well along a wellhead, and displacement sensors are arranged on the monitoring points 9 and used for monitoring horizontal displacement of the wall top in the x direction and the y direction; a sedimentation observation point 10 is arranged on one side of each monitoring point 9; three deep holes are arranged in the soil body 7 of the back seat of the originating well and are closely attached to the outer wall of the well to serve as deep soil body displacement monitoring holes 8, and displacement sensors are arranged in the deep soil body displacement monitoring holes 8 to monitor deformation of the soil body of the back seat of the working well in real time. The bottom of the deep soil displacement monitoring hole 8 needs to exceed the lower end of the well supporting structure. The positions of the three deep soil displacement monitoring holes 8 are arranged at the positions corresponding to the center of the well and the two side walls of the well. And 1-2 backseat pore water pressure monitoring holes 11 are arranged in the influence range behind the well and in the soil body 7 of the backseat of the originating well. A pressure detection sensor is arranged in the rear seat pore water pressure monitoring hole 11 for monitoring the water pressure in the rear seat.
The device is suitable for monitoring the stress and deformation of the well structure of the large-caliber jacking pipe starting well and the deformation of the wall soil body of the rear seat of the starting well in the jacking construction process of the jacking pipe, and fills the blank in the technical field of the prior engineering. Through 4 kinds of monitoring devices arrangement in this monitoring devices, can effectually realize the monitoring to the well that originates in the construction, and all based on current engineering condition, do not increase too much equipment and monitoring degree of difficulty, monitor data is used for aassessment worker well overall deformation, the deformation of worker well back seat soil body, change of pore water pressure etc. the degree of accuracy is high.
Example 2
The embodiment provides a method for monitoring deformation of an originating well in large-diameter pipe jacking construction, which is based on the monitoring device in the embodiment 1, and specifically comprises the following steps:
(1) And (3) top force monitoring: the jacking force of jacking construction of the jacking pipe is obtained after the pressure of the jack 6 oil cylinder in the starting well is recorded in real time and converted by a plurality of jacks. The method for monitoring the jacking force can obtain data by manually reading and recording the oil cylinder pressure, and can also automatically monitor the oil cylinder pressure of the jack 6 by adopting a pressure sensor.
(2) Monitoring deformation of the front and rear wall bodies of the starting well: eight monitoring points 9 are uniformly distributed at the top of the originating well along the well mouth, and the monitoring points 9 cover four top corners of the well mouth; in the construction process, the horizontal displacement and sedimentation conditions of eight monitoring points 9 are monitored, namely, the displacement in the x direction and the y direction of the monitoring points 9 can be monitored by adopting a horizontal displacement sensor and a height sensor for data monitoring.
The depth of the large-caliber pipe-jacking starting well is deeper, the soil pressure outside the large-caliber pipe-jacking starting well is larger, so that the well wall is thicker, the overall rigidity of the well wall is larger, the well wall can be considered as a rigid body, the overall horizontal displacement and inclination of the well can be accurately calculated through the actual measurement values of the horizontal displacement and settlement of eight monitoring points 9 at the top of the starting well, and the deformation value of the real reduction well under each working condition can be accurately calculated.
(3) Monitoring deformation of a soil body of a rear seat of the working well: three deep holes are arranged in the soil body 7 of the back seat of the starting well and are closely attached to the outer wall of the well to serve as deep soil displacement monitoring holes 8 for monitoring deformation of the soil body of the back seat of the working well in real time. The bottom of the deep soil displacement monitoring hole 8 needs to exceed the lower end of the well supporting structure. The positions of the three deep soil displacement monitoring holes 8 are arranged at the positions corresponding to the center of the well and the two side walls of the well. And a displacement sensor is placed in the deep soil displacement monitoring hole 8, and the horizontal deformation amount of the soil body of the rear seat of the originating well and the deformation rule of the deep soil body are determined through measurement at different stages in the construction process.
The method can also monitor the real-time deformation condition of the rear seat soil body in the pipe jacking construction process by adopting optical fibers and other modes, so as to deduce the stress state of the originating well.
(4) And 1-2 backseat pore water pressure monitoring holes 11 are arranged in the influence range behind the well and in the soil body 7 of the backseat of the originating well. A pressure detection sensor is arranged in the rear seat pore water pressure monitoring hole 11 for monitoring the water pressure in the rear seat.
(5) The monitored frequency is based on the jacking construction operation. And monitoring every next pipe joint to obtain each monitoring value when loading and unloading the lower pipe every time.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (8)
1. The utility model provides a deformation monitoring device of originating well in major diameter pipe jacking construction, characterized in that, be connected with pressure monitoring device on jack (6) that are arranged in pipe jacking originating well (1) and are used for advancing pipe jacking pipe section (2), be used for monitoring the pressure of jack (6), and then obtain the total jacking force of jacking construction that pipe jacking pipe section (2) received in the work progress;
arranging a plurality of monitoring points (9) at the top of the pipe jacking starting well (1), and arranging displacement monitoring devices at the monitoring points (9) for monitoring horizontal displacements in the x direction and the y direction at a plurality of points on the wall top of the pipe jacking starting well (1) in the construction process;
a deep soil displacement monitoring hole (8) is formed in the rear seat soil body (7) of the originating well and is closely attached to the outer wall of the originating well (1) of the jacking pipe, and a displacement monitoring device is arranged in the deep soil displacement monitoring hole (8) to monitor the deformation of the rear seat soil body of the working well in real time in the construction process;
a backseat pore water pressure monitoring hole (11) is arranged in the soil body (7) of the backseat of the originating well, and a pressure detection device is arranged in the backseat pore water pressure monitoring hole (11) and used for monitoring the water pressure in the soil body (7) of the backseat of the originating well.
2. The deformation monitoring device for the originating well in the large-diameter pipe jacking construction according to claim 1, wherein eight monitoring points (9) are arranged at the top of the pipe jacking originating well (1), and the eight monitoring points (9) are respectively positioned at four top corners of a wellhead and at the centers of four sides of the wellhead.
3. The device for monitoring deformation of an originating well in large-diameter pipe-jacking construction according to claim 1 or 2, wherein one side of each monitoring point (9) is provided with a settlement observation point (10).
4. The device for monitoring deformation of an originating well in large-diameter pipe jacking construction according to claim 1, wherein three deep soil displacement monitoring holes (8) are formed in total, and the three deep soil displacement monitoring holes (8) are respectively formed in positions corresponding to the center of a well wall and edges of two side walls of the well.
5. The device for monitoring deformation of an originating well in large-diameter pipe-jacking construction according to claim 1 or 4, wherein the bottom of the deep soil displacement monitoring hole (8) exceeds the lower end of the work well supporting structure.
6. The device for monitoring deformation of an originating well in large-diameter pipe jacking construction according to claim 1, wherein 1-2 backseat pore water pressure monitoring holes (11) are formed in a backseat soil body (7) of the originating well within an influence range behind the pipe jacking originating well (1).
7. An originating well deformation monitoring method based on the originating well deformation monitoring device in large-diameter pipe jacking construction according to any one of claims 1-6, and characterized by comprising monitoring jacking force, monitoring side wall deformation before and after a working well, monitoring soil deformation of a rear seat of the working well and monitoring underground pore water pressure in the construction process;
and (3) monitoring the jacking force: recording the pressure of an oil cylinder of a jack (6) in the jacking pipe starting well (1) in real time to obtain the jacking force of jacking construction of the jacking pipe;
and the deformation monitoring of the front and rear side wall bodies of the working well is carried out: monitoring the horizontal displacement and sedimentation conditions of each monitoring point (9) in the construction process, namely the displacement of the monitoring points (9) in the x direction and the y direction;
the deformation monitoring of the soil body of the rear seat of the working well: measuring deformation of the working well back seat soil body at the position of the deep soil body displacement monitoring hole (8), and determining the horizontal deformation amount of the working well back seat soil body and the deep soil body deformation law through measurement at different stages in the construction process;
the underground pore water pressure monitoring: the water pressure in the pore water pressure monitoring hole (11) of the rear seat is detected and is used for monitoring the water pressure in the rear seat.
8. The method for monitoring the deformation of the originating well based on the device for monitoring the deformation of the originating well in the large-diameter pipe jacking construction according to claim 7 is characterized in that an optical fiber measurement mode is adopted to monitor the real-time deformation condition of a rear seat soil body in the pipe jacking construction process so as to deduce the stress state of the originating well.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310966194.XA CN117146889A (en) | 2023-08-02 | 2023-08-02 | Originating well deformation monitoring device and method in large-diameter pipe jacking construction |
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| CN202310966194.XA CN117146889A (en) | 2023-08-02 | 2023-08-02 | Originating well deformation monitoring device and method in large-diameter pipe jacking construction |
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