CN114607833A - Vertical curve downward-penetrating construction method for rectangular jacking pipe meeting obstacle - Google Patents
Vertical curve downward-penetrating construction method for rectangular jacking pipe meeting obstacle Download PDFInfo
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- CN114607833A CN114607833A CN202210230241.XA CN202210230241A CN114607833A CN 114607833 A CN114607833 A CN 114607833A CN 202210230241 A CN202210230241 A CN 202210230241A CN 114607833 A CN114607833 A CN 114607833A
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- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000004888 barrier function Effects 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000012937 correction Methods 0.000 abstract description 9
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 210000000481 breast Anatomy 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The application discloses a construction method for downward penetration of a rectangular jacking pipe in a vertical curve meeting an obstacle, which comprises the following steps: when the push bench advances to a first distance away from an obstacle, controlling a push bench head to extend out of two groups of correction oil cylinders on the upper left and the upper right, and pushing the push bench head into a downslope according to a first slope; when the push bench moves to a second distance away from the obstacle, the push bench head is controlled to slowly retract into the upper left and upper right groups of deviation-correcting oil cylinders; when the push bench advances to a third distance away from the obstacle, the push bench head is controlled to synchronously extend out of the left lower deviation-correcting oil cylinder and the right lower deviation-correcting oil cylinder and push the push bench to the upper slope according to a second slope; and when the push bench is at a fourth distance from the target center, the push bench head is controlled to slowly withdraw the left lower deviation-rectifying oil cylinder and the right lower deviation-rectifying oil cylinder until the design elevation is restored. The method is suitable for the situation that the barrier is difficult to remove, and can efficiently and safely pass through the barrier in a short construction period.
Description
Technical Field
The invention relates to a rectangular jacking pipe construction method, in particular to a vertical curve downward-penetrating construction method for a rectangular jacking pipe meeting an obstacle.
Background
In recent decades, with the continuous popularization of a rectangular pipe-jacking construction method, the rectangular pipe-jacking construction method has the advantages of large tunneling section, high space utilization rate, capability of effectively avoiding shallow pipelines, high construction speed and the like, and is widely applied to urban subway entrances and exits and underground comprehensive pipe galleries. However, it is also common for a jacking pipe to encounter underground obstacles. The conventional treatment method is to remove obstacles, but if the removal of the obstacles is difficult, the construction period of the rectangular jacking pipe is influenced.
Disclosure of Invention
The invention aims to provide a vertical curve downward-penetrating construction method for a rectangular jacking pipe to meet an obstacle, so that the rectangular jacking pipe can safely, smoothly and efficiently penetrate through the obstacle.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to one aspect of the invention, a vertical curve downward-penetrating construction method for a rectangular jacking pipe meeting an obstacle is provided, which comprises the following steps:
when the push bench advances to a first distance away from an obstacle, controlling a push bench head to extend out of two groups of correction oil cylinders on the upper left and the upper right, and pushing the push bench head into a downslope according to a first slope;
when the push bench moves to a second distance away from the obstacle, the push bench head is controlled to slowly retract into the upper left and upper right groups of deviation-correcting oil cylinders;
when the push bench advances to a third distance away from the obstacle, the upper left and upper right groups of correction oil cylinders are completely retracted, the push bench head is controlled to synchronously extend out of the lower left and lower right correction oil cylinders, and the push bench is pushed into the upper slope according to a second slope;
and when the push bench is at a fourth distance from the target center, the push bench head is controlled to slowly withdraw the left lower group of deviation-correcting oil cylinders and the right lower group of deviation-correcting oil cylinders until the deviation is restored to the designed elevation, and the jacking of the section of vertical curve is completed.
In one embodiment, the first distance is 17m, the first slope is 1.5%, and the second distance is 3 m.
In one embodiment, the third distance is 1m, the second slope is 1%, and the fourth distance is 3 m.
In one embodiment, the bentonite slurry is continuously and uniformly injected into the pipe joints and the top of the pipe jacking machine at the point when the pipe jacking passes through the obstacle.
In one embodiment, the arc-shaped low-lying area formed by the inner bottom of the cross-section jacking pipe is eliminated in a slope-finding mode by C20 fine-stone concrete.
In one embodiment, during the traversing process, the posture of the pipe jacking machine and the elevation of the finished pipe jacking pipe joint are manually retested in real time.
In one embodiment, when the downhill is jacked according to the first slope, the jacking speed is reduced from the normal speed of 20mm/min to 10 mm/min; and after the design elevation is recovered, the jacking speed is recovered to 20 mm/min.
In one embodiment, the barrier is a medium-pressure gas pipe, and when the push bench reaches 1m in front of the gas pipe, the gas pipe is temporarily cut off until the push bench completely passes through the gas pipe.
In one embodiment, after the push bench completely passes through, the middle compression ignition gas pipe is subjected to a pressurization test.
In one embodiment, after the pressurization test confirms that the medium-pressure gas pipe is intact, the medium-pressure gas pipe is temporarily ventilated at 0.17Mpa until the top pipe is completely pushed, and after the pipe joint is fixed, the medium-pressure gas pipe is normally ventilated again.
The embodiment of the invention has the beneficial effects that: the construction method is suitable for the situation that the barrier is difficult to remove, and can efficiently and safely pass through the barrier in a short construction period.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 is a schematic flow chart of a method of an embodiment of the present invention;
FIG. 2 is a process flow of a rectangular pipe jacking construction in the prior art;
FIG. 3 is a schematic view of an obstacle crossing according to an embodiment of the present invention;
FIG. 4 is a first schematic diagram of a pipe jacking process in an embodiment of the invention;
FIG. 5 is a second schematic diagram of the pipe jacking process in the embodiment of the invention;
FIG. 6 is a third schematic diagram of the pipe jacking process in the embodiment of the invention;
FIG. 7 is a fourth schematic diagram of the pipe jacking process in the embodiment of the invention;
FIG. 8 is a schematic view illustrating the adjustment of the positional relationship between the fore-pipe and the obstacle;
FIG. 9 is a cross-sectional view illustrating adjustment of the positional relationship between the front ceiling pipe and the obstacle;
FIG. 10 is a schematic view showing the positional relationship between the jacking pipes and the obstacles after construction along the vertical curve.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
The embodiment of the application takes a rectangular jacking pipe underpass road project of a certain comprehensive pipe gallery in Suzhou city as an example, and in the project, the construction process flow of the rectangular jacking pipe is shown in figure 2. The principle of the rectangular pipe jacking construction process is as follows:
the excavation soil cabin of the soil pressure balance type rectangular pipe jacking machine comprises a cutter head, a breast board, a soil cabin grouting system and the like, soil cut off by the cutter head flows into the soil cabin through a cutter head opening area and a cutting dead zone, the soil in the soil cabin is continuously and fully stirred by a stirring rod arranged on the back of the cutter head, and is pressurized through the breast board by means of the thrust of a main jack to generate soil pressure, the pressure acts on the whole pipe jacking machine working face through the soil and the cutter head to enable the working face to be stable, meanwhile, two spiral conveyors are adopted for soil discharging, the soil discharging amount of the spiral conveyors is adapted to the thrust of the main jack, the excavation soil amount and the soil discharging amount are kept balanced all the time in the jacking process, and the soil pressure in the soil cabin is kept stable in a preset range. The soil pressure in the soil cabin is measured by a soil pressure sensor preset on a breast board of the soil cabin and is transmitted to an operation table of the push bench. The control principle can be seen in the schematic diagram of the soil cabin pressure control in order to ensure that the preset soil pressure can be adjusted by controlling the thrust, the propelling speed and the rotating speed of the screw conveyor. When the soil pressure in the soil cabin is greater than the soil pressure and the water pressure of the stratum, the earth surface will bulge; when the soil pressure in the soil cabin is smaller than the stratum soil pressure and the water pressure, the earth surface sinks; therefore, the soil pressure in the soil chamber should be balanced with the formation soil pressure and water pressure.
When the earth pressure balance push bench is connected with the power supply of the cutter driving motor, the cutter of the push bench starts to rotate, the blades arranged in front of each cutter row start to cut earth and sand, and the stirring rod arranged behind the cutter rows stirs the earth and sand in the earth bin. If the clay content in the sand is more than 20%, the clay does not need to be added.
If the push bench is in the sand or gravel layer and the clay content is below 15%, slurry mainly containing mud must be injected into the mud bin and stirred together with the cut sand. Only when the soil in the soil bin is improved to have three properties of better plasticity, fluidity and water-stopping property, the stirring is successful, and the addition of the soil material is reasonable.
In the jacking process, the sum of the static soil pressure in the soil layer in front of the top of the pipe jacking machine and the underground water pressure is assumed to be H, and the pressure in the soil cabin of the pipe jacking machine is assumed to be I; assuming that the sum of the static soil pressure in the soil layer in front of the bottom of the push bench and the pressure of underground water is J and the pressure in the soil cabin of the push bench is K, the necessary conditions for achieving soil pressure balance are that H is I and J is K.
However, in the project, when the starting well and the receiving well are both completed, and according to the original drawings provided by the gas construction unit, and the position of the pipeline meets the jacking safety distance, in order to ensure that nothing is lost, after the pipe jacking equipment is installed in the field, the accurate measurement shows that a middle-pressure gas pipe 1 with the diameter of 160mm is overlapped with the cross section of the pipe jacking 3 with the diameter of 150mm at the position 23m away from the pipe jacking starting well, and the position relationship between the gas pipe 1 and the pipe jacking 3 is shown in fig. 8 and 9.
The conventional treatment method is gas pipe relocation and modification, and the relocation and modification requires a series of procedural problems such as planning, approval, construction and the like, so that the period is long. The project is short in construction period and heavy in task, and a construction scheme that existing gas pipelines are penetrated downwards through a top pipe vertical curve as shown in fig. 10 is adopted in combination with conditions of pipe gallery line shapes, existing gas pipe positions, subway upward penetration clearance and the like.
Because the gas pipeline 1 is embedded into the top pipe 3 with the section of 10cm, the top pipe needs to be firstly pushed to descend when being pushed in, the position of the gas pipeline 1 needs to descend by 25cm, the clear distance between the top pipe 3 and the gas pipeline 1 is ensured to be 15cm, and the top pipe 3 is slowly lifted to the designed elevation after passing through the gas pipeline 1, namely, the top pipe passes through the gas pipeline 1 along the vertical curve.
As shown in fig. 1 and 3, the construction method adopted in the present embodiment is:
s100, when the push bench advances to a first distance A from an obstacle, controlling a push bench head to extend out of two groups of correction oil cylinders on the upper left and the upper right, and pushing the push bench down slope according to a first slope alpha;
s200, when the push bench moves to a second distance B from the obstacle, controlling the push bench head to slowly retract into the upper left deviation-correcting oil cylinder and the upper right deviation-correcting oil cylinder;
s300, when the push bench advances to a third distance C from the obstacle, the upper left group of correction oil cylinders and the upper right group of correction oil cylinders are completely retracted, the push bench head is controlled to synchronously extend out of the lower left correction oil cylinders and the lower right correction oil cylinders, and the push bench is pushed into an upper slope according to a second slope beta;
s400, when the push bench is 2 fourth distance D from the target center, controlling the push bench head to slowly withdraw the left lower deviation-correcting oil cylinder and the right lower deviation-correcting oil cylinder until the left lower deviation-correcting oil cylinder and the right lower deviation-correcting oil cylinder are restored to the designed elevation, and completing the jacking of the section of the vertical curve.
It should be noted that the first distance, the second distance, the third distance, and the fourth distance in the above steps are all distances in the horizontal direction.
In the project, the gas pipeline 1 is away from a portal 23m, and the existing originating portal reinforcement area is 6 m. Therefore, after the pipe jacking machine head passes through the reinforcing area, the pipe jacking machine head extends out of the upper left deviation-correcting oil cylinder and the upper right deviation-correcting oil cylinder at a distance of 17m from the gas pipeline, jacking is carried out according to the gradient of 1.5%, and the jacking speed is reduced from the normal speed of 20mm/min to the speed of 10 mm/min. The arc-shaped low-lying area formed by the inner bottom of the cross-over section top pipe is eliminated in a slope-finding mode by adopting C20 fine-stone concrete.
Because the deviation-correcting oil cylinders extend out and have a slope trend, according to construction experience and the performance of the push bench, the two groups of deviation-correcting oil cylinders, namely the upper left deviation-correcting oil cylinder and the upper right deviation-correcting oil cylinder, are slowly retracted when the push bench moves to 20 m. When the vehicle travels to 22m, the upper left and upper right groups of the deviation-correcting oil cylinders are completely retracted, and at the moment, the lower left and lower right groups of the deviation-correcting oil cylinders synchronously extend out and are jacked according to the gradient of 1%. And slowly withdrawing the left lower deviation-rectifying oil cylinders and the right lower deviation-rectifying oil cylinders when the distance between the push bench and the target center 2 (the intersection point of the advancing direction of the push bench and the original designed jacking route) is still 3m until the distance is restored to the designed elevation, and completing jacking of the section of the vertical curve. The jacking process is illustrated in fig. 4-7.
After the push bench smoothly passes through the gas pipeline, the jacked vertical curve pipeline inevitably has a slow floating phenomenon due to the action of bottom water and soil buoyancy and the horizontal jacking force of the jack. At the moment, the jacking process needs to carry out elevation monitoring on the jacked pipeline in real time, and bentonite slurry is continuously injected between the pipe joint and the gas pipeline, so that the friction phenomenon between the pipe joint and the gas pipeline is avoided. Therefore, in the process that the push bench passes through the barrier along the vertical curve, the posture of each pipe section of the push bench and the elevation of the finished pipe section of the push bench are manually retested. When the jacking pipe passes through the gas pipe, bentonite slurry is continuously and uniformly injected into the pipe joint and the top of the pipe jacking machine at the position to reduce the friction force between the pipe joint and the soil body to the maximum extent, prevent the pipe jacking machine and the pipe joint from generating a soil backing phenomenon, and ensure that a layer of mud film is arranged between the gas pipeline and the pipe joint.
As the barrier which passes through the project is the medium-pressure gas pipe, in order to ensure the safety of the gas pipe during the passing through, the gas pipe is temporarily cut off when the pipe jacking machine reaches the front 1m of the gas pipe until the pipe jacking machine completely passes through. After the pipe jacking machine completely passes through the gas pipe, coordinating a gas company to perform a pressurization test on the gas pipe, sequentially testing the gas tightness of the gas pipe from 0.05Mpa to 0.17Mpa to 0.25Mpa, temporarily ventilating at 0.17Mpa after the pipe jacking machine is confirmed to be intact until the pipe jacking machine is completely pushed through, and recovering the medium-pressure normal ventilation at 0.4Mpa after a pipe joint is fixed.
In summary, the embodiment of the application provides a construction method for downward penetrating a rectangular jacking pipe through a vertical curve of an obstacle, the jacking pipe machine is jacked at a specific distance according to a specific gradient by controlling the telescopic cylinder of a jacking pipe machine head, and the vertical curve of the obstacle is penetrated through. It should be noted that, during the period of passing through the existing obstacle by using the pipe jacking vertical curve, the common participation of all participants of the project, the strict organization implementation of all processes and the strict monitoring of the monitoring unit are required. In addition, in the case of underground engineering construction, geological exploration and pipeline exploration at an early stage are particularly important.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A vertical curve downward-penetrating construction method for a rectangular jacking pipe meeting an obstacle is characterized by comprising the following steps:
when the push bench moves to a first distance away from an obstacle, controlling the push bench head to extend out of the upper left deviation correcting cylinder and the upper right deviation correcting cylinder, and pushing the push bench head into a downhill according to a first slope;
when the push bench moves to a second distance away from the obstacle, the push bench head is controlled to slowly retract into the upper left and upper right groups of deviation-correcting oil cylinders;
when the push bench advances to a third distance away from the obstacle, the upper left deviation correcting oil cylinder and the upper right deviation correcting oil cylinder are completely retracted, the push bench head is controlled to synchronously extend out of the lower left deviation correcting oil cylinder and the lower right deviation correcting oil cylinder, and the push bench is pushed into an upper slope according to a second slope;
and when the push bench is at a fourth distance from the target center, controlling the push bench head to slowly withdraw the left lower deviation rectifying cylinder and the right lower deviation rectifying cylinder until the left lower deviation rectifying cylinder and the right lower deviation rectifying cylinder are recovered to the designed elevation, and completing the jacking of the section of the vertical curve.
2. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 1, which is characterized in that: the first distance is 17m, the first slope is 1.5%, and the second distance is 3 m.
3. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 2, which is characterized in that: the third distance is 1m, the second gradient is 1%, and the fourth distance is 3 m.
4. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 1, which is characterized in that: when the jacking pipe passes through the obstacle, the bentonite slurry is continuously and uniformly injected into the pipe joint and the top of the jacking pipe machine at the position.
5. The vertical curve downward-penetrating construction method for the rectangular jacking pipe meeting the obstacle, according to claim 4, is characterized in that: the arc-shaped low-lying area formed by the inner bottom of the cross-over section top pipe is eliminated in a slope-finding mode by adopting C20 fine-stone concrete.
6. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 1, which is characterized in that: and in the crossing process, manually retesting the posture of the push bench and the elevation of the finished push bench pipe joint in real time.
7. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 1, which is characterized in that: when the vehicle is jacked down the slope according to the first slope, the jacking speed is reduced to 10mm/min from the normal speed of 20 mm/min; and after the design elevation is recovered, the jacking speed is recovered to 20 mm/min.
8. The construction method for the rectangular jacking pipe to penetrate downwards along the vertical curve of the obstacle according to claim 1, which is characterized in that: the barrier is a medium-pressure gas pipe, and when the push bench reaches 1m in front of the gas pipe, the gas pipe is temporarily cut off until the push bench completely passes through the barrier.
9. The vertical curve downward-penetrating construction method for the rectangular jacking pipe meeting the obstacle, according to claim 8, is characterized in that: and after the push bench completely passes through the middle compression ignition air pipe, performing a pressurization test.
10. The vertical curve downward-penetrating construction method for the rectangular jacking pipe meeting the obstacle, according to claim 9, is characterized in that: and after the pressurization test confirms that the medium-pressure gas pipe is intact, temporarily ventilating at 0.17Mpa until the jacking pipe is completely jacked, and after the pipe joint is fixed, ventilating the medium-pressure gas pipe again normally.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210230241.XA CN114607833A (en) | 2022-03-09 | 2022-03-09 | Vertical curve downward-penetrating construction method for rectangular jacking pipe meeting obstacle |
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| CN202210230241.XA CN114607833A (en) | 2022-03-09 | 2022-03-09 | Vertical curve downward-penetrating construction method for rectangular jacking pipe meeting obstacle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307816A (en) * | 2023-11-28 | 2023-12-29 | 中国建筑第六工程局有限公司 | Construction method for long-distance side-penetrating old drainage concrete pipeline of jacking pipe |
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| CN113833480A (en) * | 2021-09-29 | 2021-12-24 | 成都建工第九建筑工程有限公司 | Shield initial tunneling and arrival construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117307816A (en) * | 2023-11-28 | 2023-12-29 | 中国建筑第六工程局有限公司 | Construction method for long-distance side-penetrating old drainage concrete pipeline of jacking pipe |
| CN117307816B (en) * | 2023-11-28 | 2024-04-09 | 中国建筑第六工程局有限公司 | Construction method for long-distance side-penetrating old drainage concrete pipeline of jacking pipe |
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