CN109469062A - A kind of lock steel pipe pile cofferdam lock borehole cleaning method - Google Patents
A kind of lock steel pipe pile cofferdam lock borehole cleaning method Download PDFInfo
- Publication number
- CN109469062A CN109469062A CN201811557817.3A CN201811557817A CN109469062A CN 109469062 A CN109469062 A CN 109469062A CN 201811557817 A CN201811557817 A CN 201811557817A CN 109469062 A CN109469062 A CN 109469062A
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- sand
- sandpipe
- borehole cleaning
- layer
- lock
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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
- E02D13/08—Removing obstacles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The present invention relates to railroad bridge foundation in water technical field of construction, in particular to a kind of lock steel pipe pile cofferdam latches borehole cleaning method, the borehole cleaning method is the following steps are included: by the layer of sand insert port insertion layer of sand 200-550mm of sandpipe out, the gentle source of sandpipe is connected out by connecting tube, compressed air is transported to out to the second end of sandpipe from connecting tube, and the dregs of second end layer of sand are blown afloat, the mixture of the dregs and water that are easily drawn out is mixed into the water on layer of sand, and then the mixture is transported to first end from second end, it is discharged by drain pipe, after the layer of sand dregs locating for the second end clean out, continue to transfer out sandpipe, second end is arranged at layer of sand 200-550mm and carries out borehole cleaning, until steel-pipe pile latch in layer of sand dregs clearly to designed elevation when, borehole cleaning terminates.Relative to traditional artificial borehole cleaning method, this machinery borehole cleaning method improves borehole cleaning quality and borehole cleaning speed, while strengthening safety coefficient, and avoiding standing because of operating personnel is latching other borehole cleaning bring safety problem.
Description
Technical field
The present invention relates to railroad bridge foundation in water technical field of construction, in particular to a kind of lock steel pipe pile cofferdam lock
Borehole cleaning method.
Background technique
With the fast development of Chinese national economy, the construction of railway and highway system is increased, four vertical eight horizontal traffic networks are
The problem of preliminarily forming, how passing through high mountain, valley or river inevitably occurs, therefore makes great efforts innovation bridge foundation in water
Construction technology, it appears be even more important.Bridge foundation in water mainly uses cofferdam structure form to construct at present, wherein latching steel-pipe pile
Cofferdam is cofferdam construction technology more advanced in recent years, and structure is simple, and strong operability is widely applied.Latch steel
Tubular pole is made of steel pipe 50 as shown in Figure 1, C-type steel 60, T-steel 80, in steel-pipe pile work progress, is inevitably had
Silt or other sundries enter in the hole set, and in order to guarantee the smooth of construction, we have to clear out the sundries in hole.
Before filling sealing material in lock steel-pipe pile, need to clear up in steel-pipe pile lock 70 that layer of sand is to designed elevation, if after cleaning
Do not reach designed elevation, may result in drainage, so as to cause foundation engineering extension.Steel-pipe pile latches 70 borehole cleanings at present
Artificial borehole cleaning is generally by the way of, by by hand bit by bit by lock sand and water clean up until design mark
Height, this borehole cleaning mode working efficiency is low, and borehole cleaning effect is undesirable, and during borehole cleaning, since operating personnel stands
Lock side, there is also some potential safety problemss.
Summary of the invention
It is an object of the invention to overcome the steel-pipe pile in the presence of the prior art to latch the artificial borehole cleaning working efficiency of dregs
It is low, a kind of efficient lock steel pipe pile cofferdam lock borehole cleaning method using mechanical device is provided.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of lock steel pipe pile cofferdam lock borehole cleaning method, carries out borehole cleaning using hole cleaning device, the hole cleaning device includes
Sandpipe out, and with it is described go out the connecting tube that be connected to of sandpipe side wall, the sandpipe out includes superposed first end and is located at
The second end of lower part, the connecting tube include with the third end of the connection of sandpipe side wall out and for being connected with air inlet pipe
4th end；The borehole cleaning method the following steps are included:
Step 1: connecting air inlet pipe for the 4th end of the connecting tube of the hole cleaning device, and the air inlet pipe is connected to gas source
Device；
Step 2: by drain pipe setting in steel-pipe pile lock；
Step 3: the second end of sandpipe out is arranged in the layer of sand in steel-pipe pile lock, and by the second end
It is inserted into the depth of layer of sand surface or less 200-550mm；
Step 4: the compressed air source unit is opened, compressed air is transported to the connecting tube by the air inlet pipe, then conveys
To it is described go out sandpipe the second end, finally by the dregs of the second end layer of sand blow afloat and layer of sand on water be mixed into easily
In the dregs of extraction and the mixture of water, the mixture is transported to first end from the second end, is discharged by drain pipe；
Step 5: after the layer of sand locating for the second end cleans out, i.e., when the second end exposes layer of sand surface,
The second end is inserted into layer of sand surface and carries out sand removal to five hereinafter, repeating step 3 again, until in steel-pipe pile lock
Layer of sand dregs clearly to designed elevation when, close the compressed air source unit, sandpipe will be gone out by hanging ring and taken out, borehole cleaning is completed.
Wherein, second end is inserted into the optimal depth of layer of sand as 500mm, and the optimal distance of connecting tube and the second end is
30mm；Due to second end be with bevel edge/arc side layer of sand insert port, i.e. end face is not concordant with horizontal plane, here connecting tube and
Second end in the distance of second end refers to the highest point of second end under working condition.
In addition, dregs refer to that sand, silt and other such as all sizes of stone leaf are less than the impurity for pipe diameter of shaking out；
The arc side that arc side can be evagination is also possible to the arc side of indent.
The present invention will go out sandpipe setting in steel-pipe pile lock by hanging ring, and the layer of sand insert port by going out sandpipe is inserted into sand
At layer 200-550mm, the gentle source of sandpipe is connected out by connecting tube, compressed air is transported to out the second of sandpipe from connecting tube
End, and the dregs of second end layer of sand blow afloat and layer of sand on water be mixed into the mixtures of the dregs and water that are easily drawn out, in turn
The mixture is transported to first end from the second end, is discharged by drain pipe, the layer of sand slag locating for the second end
After dregs cleans out, continue to transfer out sandpipe, second end is arranged at layer of sand 200-550mm and carries out borehole cleaning, until the steel
Tubular pole latch in layer of sand dregs clearly to designed elevation when, borehole cleaning terminates；Relative to traditional artificial borehole cleaning method, this machinery borehole cleaning
Method improves borehole cleaning quality and borehole cleaning speed, while strengthening safety coefficient, avoids because operating personnel stands by lock
Borehole cleaning bring safety problem.
Preferably, the borehole cleaning method further include: repeat to hammer out sandpipe during taking out sand, avoid because of stone or sand
It accumulates in pipe, leads to sandpipe or the sediment outflow blockage out.
It preferably, is in 60 degree to 120 degree of angle between the drain pipe and the sandpipe out.
Wherein, the drain pipe and optimal angle of sandpipe is 90 degree out.
It preferably, is in 15 degree to 21 degree of angle between the connecting tube and the sandpipe out.
Wherein, optimal angle is 18 degree between sandpipe and connecting tube out.
Preferably, described further includes hanging ring, and the hanging ring is arranged in the pipe outer wall of sandpipe out.
Compared with prior art, beneficial effects of the present invention:
The present invention will go out sandpipe setting in steel-pipe pile lock by hanging ring, and the layer of sand insert port by going out sandpipe is inserted into sand
At layer 200-550mm, the gentle source of sandpipe is connected out by connecting tube, compressed air is transported to out the second of sandpipe from connecting tube
End, and the dregs of second end layer of sand blow afloat and layer of sand on water be mixed into the mixtures of the dregs and water that are easily drawn out, in turn
The mixture is transported to first end from the second end, is discharged by drain pipe, the layer of sand slag locating for the second end
After dregs cleans out, continues decentralization for second end and progress borehole cleaning is set at layer of sand 200-550mm, until the steel-pipe pile latches
Interior layer of sand dregs clearly to designed elevation when, borehole cleaning terminates；Relative to traditional artificial borehole cleaning method, this machinery borehole cleaning method is promoted
Borehole cleaning quality and borehole cleaning speed, while strengthening safety coefficient are avoided and are brought because operating personnel stands latching other borehole cleaning
Safety problem.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of steel-pipe pile lock；
Fig. 2 is the structural schematic diagram for latching device and steel-pipe pile lock used in steel pipe pile cofferdam lock borehole cleaning；
Fig. 3 is hanging ring and the structural schematic diagram of sandpipe out；
Fig. 4 is out sandpipe structural schematic diagram of the second end with bevel edge；
Fig. 5 is out sandpipe structural schematic diagram of the second end with indent arc side.
Marked in the figure: 1- first end, 2- second end, 3- third end, the 4th end 4-, 5- layer of sand, 6- water, 7- hanging ring, 10- go out
Sandpipe, 20- connecting tube, 30- drain pipe, 40- air inlet pipe, 50- steel pipe, 60-C fashioned iron, 70- steel-pipe pile lock, 80-T fashioned iron.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Specific embodiment is as follows, as shown in Figure 1, the structural schematic diagram of steel-pipe pile lock 70, latches steel-pipe pile by steel pipe
50, C-type steel 60 and T-steel 80 are constituted, and steel-pipe pile lock 70 is by the C-type steel 60 of first steel-pipe pile right end and second steel-pipe pile
The T-steel 80 of left end forms.In steel-pipe pile work progress, inevitably has silt or other sundries and enter and set
In hole, i.e., steel pipe hole and steel-pipe pile latch in 70 holes.
As shown in Fig. 2, the structure of device and steel-pipe pile lock 70 used in lock steel pipe pile cofferdam lock borehole cleaning method
Schematic diagram, including go out sandpipe 10 and connecting tube 20, the sandpipe 10 out includes first end 1 and second end 2, and the connecting tube 20 is wrapped
Third end 3 and the 4th end 4 are included, the first end 1 is used for sediment outflow, and the second end 2 is arranged in layer of sand 5, and the third end 3 is set
It sets on the side wall of sandpipe 10 out and is communicated with the inside of sandpipe 10 out, the 4th end 4 is connected by the air inlet pipe 40
It is connected to gas source mechanism, the gas source mechanism is transported to institute for blowing afloat by the dregs in 2 layer of sand 5 of second end and passing through water 6
State first end 1.
A kind of lock steel pipe pile cofferdam lock borehole cleaning method, carries out borehole cleaning using hole cleaning device, the hole cleaning device includes
Sandpipe 10 out, and with it is described go out the connecting tube 20 that be connected to of 10 side wall of sandpipe, it is described go out sandpipe 10 include superposed first
The end 1 and second end 2 positioned at lower part, the connecting tube 20 include going out the third end 3 that is connected to of 10 side wall of sandpipe and to be used for described
The 4th end 4 being connected with air inlet pipe 40；The borehole cleaning method the following steps are included:
Step 1: the 4th end 4 of the connecting tube 20 of the hole cleaning device is connected into air inlet pipe 40, the air inlet pipe 40 is connected
Ventilation source device；
Step 2: by the drain pipe 30 setting in steel-pipe pile lock 70；
Step 3: the second end 2 of sandpipe 10 out is arranged in the layer of sand 5 in the steel-pipe pile lock 70, and will be described
Second end 2 is inserted into the depth of 5 surface of layer of sand or less 200-550mm；
Step 4: opening the compressed air source unit, and compressed air is transported to the connecting tube 20 by the air inlet pipe 40, then
Be transported to it is described go out sandpipe 10 the second end 2, finally by the dregs of 2 layer of sand 5 of second end blow afloat and layer of sand 5 on
Water 6 is mixed into the mixture of the dregs being easily drawn out and water 6, and the mixture is transported to first end 1 from the second end 2,
It is discharged by drain pipe 30；
Step 5: after the layer of sand 5 locating for the second end 2 cleans out, i.e., when the second end 2 exposes 5 table of layer of sand
When face, the second end 2 is inserted into 5 surface of layer of sand hereinafter, repeating step 3 again and carries out sand removal to five, until the steel-pipe pile
In lock 70 5 dregs of layer of sand clearly to designed elevation when, close the compressed air source unit, sandpipe 10 will be gone out by hanging ring 7 and be taken out, borehole cleaning
It completes.
Wherein, it is 500mm that second end 2, which is inserted into the optimal depth of layer of sand 5, connecting tube 20 and the second end 2 it is optimal away from
From for 30mm；Since second end 2 is with 5 insert port of bevel edge/arc side layer of sand, i.e. end face is not concordant with horizontal plane, connects here
Second end 2 in the distance of adapter tube 20 and second end 2 refers to the highest point of second end 2 under working condition.
In addition, dregs refer to that sand, silt and other such as all sizes of stone leaf are less than the impurity of 10 diameter of sandpipe；
Compressed air source unit includes air compressor machine；
The arc side that arc side can be evagination is also possible to the arc side of indent；
Sandpipe 10 uses D50 seamless steel pipe out, and the connecting tube 20 uses D20 seamless steel pipe.
Borehole cleaning method further include: need constantly to hammer out sandpipe 10 during taking out sand, avoid because of stone or sand accumulation pipe
It is interior, cause the sandpipe 10 out or drain pipe 30 to block.
It is in 60 degree to 120 degree between drain pipe 30 and the sandpipe 10 out；Wherein, drain pipe 30 and the out optimal folder of sandpipe 10
Angle is 90 degree.
Sandpipe 10 is a straight tube out, needs to connect drain pipe 30 to guide the direction and position of sediment outflow, 30 He of drain pipe
It can conveniently sediment outflow when 10 angle of sandpipe is 90 degree out.
It is in 15 degree to 21 degree between connecting tube 20 and the sandpipe 10 out；Wherein, out between sandpipe 10 and connecting tube 20 most
Excellent angle is 18 degree.
Due to connecting tube 20 and out between sandpipe 10 in 15 to 21 degree, the length of connecting tube 20 is unsuitable too long, otherwise can lead
It causes hole cleaning device excessive, cannot be introduced into borehole cleaning in steel-pipe pile lock 70, the length of connecting tube 20 is 300 to 400mm, air inlet pipe 40
Using hose, soft air inlet pipe 40 is supplemented as the compressed gas delivery tube between compressed air source unit and connecting tube 20.
As shown in figure 3, hanging ring 7 and the out structural schematic diagram of sandpipe 10, the setting of hanging ring 7 in borehole cleaning method and step is being shaked out
On the outer tube wall of pipe 10, specific location is 7 axle center of hanging ring at 1 face 0 of first end to 200mm, passes through hanging ring as shown in Figure 3
7 may be implemented following movement: by sandpipe 10 out be arranged in steel-pipe pile lock 70 in, it is subsequent while take out while transfer out under sandpipe 10
The taking-up for going out sandpipe 10 after putting movement, reaching designed elevation acts and other need the movement of hanging ring 7.
As shown in figure 4, second end 2 is to go out 10 structural schematic diagram of sandpipe with bevel edge, sandpipe 10 out is understood for convenience
Structure amplifies sandpipe 10 out twice；
Wherein, second end 2 can be bevel edge, convenient in the second end 2 insertion layer of sand 5.
This bevel edge can be the bevel edge on one side as shown in Figure 4, be also possible to go out sandpipe 10 be that center line is symmetrically set
Two bevel edges set are also possible to not to go out sandpipe 10 for symmetrically arranged two bevel edges of center line.
The angle of the bevel edge and horizontal plane is 30 to 60 degree.
As shown in figure 5, second end 2 is to go out 10 structural schematic diagram of sandpipe with indent arc side, sandpipe out is understood for convenience
10 structure amplifies sandpipe 10 out twice；
The arc side of second end 2 or indent, convenient in the second end 2 insertion layer of sand 5.
This indent arc side can be the indent arc side on one side as shown in Figure 5, be also possible to centered on going out sandpipe 10
The symmetrically arranged two indent arc sides of line are also possible to not to go out sandpipe 10 for the symmetrically arranged two indent arc sides of center line.
Meanwhile evagination arc side corresponding with the indent arc side should also be as being within the protection scope of the application.
Second end 2 is bevel edge/indent arc side/evagination arc side, and the setting of third end 3 is arrived apart from 2 end 20 of second end
At 40mm；Since second end 2 is bevel edge/indent arc side/evagination arc side 5 insert port of layer of sand, i.e. end face is not concordant with horizontal plane,
Here the second end 2 in the distance of connecting tube 20 and second end 2 refers to the highest point of second end 2 under plumbness；Vertical configuration
State refers to out the state of sandpipe 10 Yu horizontal plane.
Claims (5)
1. a kind of lock steel pipe pile cofferdam latches borehole cleaning method, which is characterized in that carry out borehole cleaning, the borehole cleaning using hole cleaning device
Device include sandpipe (10), and with it is described go out the connecting tube (20) that be connected to of sandpipe (10) side wall, it is described go out sandpipe (10) wrap
Include superposed first end (1) and the second end (2) positioned at lower part, the connecting tube (20) include with it is described go out sandpipe (10)
The third end (3) of side wall connection and the 4th end (4) for being used to be connected with air inlet pipe (40)；The borehole cleaning method includes following step
It is rapid:
Step 1: the 4th end (4) of the connecting tube (20) of the hole cleaning device is connected into air inlet pipe (40), by the air inlet pipe
(40) it is connected to compressed air source unit；
Step 2: by the drain pipe (30) setting in steel-pipe pile lock (70)；
Step 3: by second end (2) setting of sandpipe out (10) in the layer of sand (5) in steel-pipe pile lock (70), and will
The depth of 200-550mm below second end (2) insertion layer of sand (5) surface；
Step 4: opening the compressed air source unit, and compressed air is transported to the connecting tube (20) by the air inlet pipe (40), then
Be transported to it is described go out sandpipe (10) the second end (2), finally the dregs of the second end (2) layer of sand (5) are blown afloat and sand
Water (6) on layer (5) is mixed into the mixtures of the dregs being easily drawn out and water (6), by the mixture from the second end (2)
It is transported to first end (1), is discharged by drain pipe (30)；
Step 5: after the layer of sand (5) locating for the second end (2) cleans out, i.e., when the second end (2) expose layer of sand
(5) when surface, the second end (2) is inserted into layer of sand (5) surface hereinafter, repeating step 3 again and carry out sand removal to five, until
Steel-pipe pile lock (70) interior layer of sand (5) dregs clearly to designed elevation when, close the compressed air source unit, passing through hanging ring (7) will
Sandpipe (10) takes out out, and borehole cleaning is completed.
2. a kind of lock steel pipe pile cofferdam according to claim 1 latches borehole cleaning method, which is characterized in that the borehole cleaning side
Method further include: need constantly to hammer out sandpipe (10) during taking out sand, avoid because stone or sand accumulation pipe in, caused by institute
State out sandpipe (10) or drain pipe (30) blocking.
3. a kind of lock steel pipe pile cofferdam according to claim 1 latches borehole cleaning method, which is characterized in that the drain pipe
(30) it is described go out sandpipe (10) between be in 60 degree to 120 degree of angle.
4. a kind of lock steel pipe pile cofferdam according to claim 1 latches borehole cleaning method, which is characterized in that the connecting tube
(20) it is described go out sandpipe (10) between be in 15 degree to 21 degree of angle.
5. a kind of lock steel pipe pile cofferdam according to claim 1 latches borehole cleaning method, which is characterized in that described to further include
Hanging ring (7), hanging ring (7) setting is in the pipe outer wall of sandpipe (10) out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811557817.3A CN109469062A (en) | 2018-12-19 | 2018-12-19 | A kind of lock steel pipe pile cofferdam lock borehole cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811557817.3A CN109469062A (en) | 2018-12-19 | 2018-12-19 | A kind of lock steel pipe pile cofferdam lock borehole cleaning method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109469062A true CN109469062A (en) | 2019-03-15 |
Family
ID=65676583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811557817.3A Pending CN109469062A (en) | 2018-12-19 | 2018-12-19 | A kind of lock steel pipe pile cofferdam lock borehole cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109469062A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252327A (en) * | 2020-10-30 | 2021-01-22 | 中铁大桥局集团第四工程有限公司 | Sand cleaning system and method for side pressure slurry tank of steel pipe pile |
| CN112832236A (en) * | 2021-01-08 | 2021-05-25 | 中铁大桥局集团有限公司 | Pipe body structure and soil sampling device suitable for mud jacking tank soil sampling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204754833U (en) * | 2015-05-21 | 2015-11-11 | 中国水利水电第五工程局有限公司 | Pneumatics is turned over to circulate and is settleed hole system |
| CN105442622A (en) * | 2015-12-15 | 2016-03-30 | 中交一公局桥隧工程有限公司 | Water-retaining construction technology for locked steel pipe piles |
| CN205914467U (en) * | 2016-08-23 | 2017-02-01 | 中国电建集团核电工程公司 | Hole system is settleed towards sediment to atmospheric pressure hydrocone type |
-
2018
- 2018-12-19 CN CN201811557817.3A patent/CN109469062A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204754833U (en) * | 2015-05-21 | 2015-11-11 | 中国水利水电第五工程局有限公司 | Pneumatics is turned over to circulate and is settleed hole system |
| CN105442622A (en) * | 2015-12-15 | 2016-03-30 | 中交一公局桥隧工程有限公司 | Water-retaining construction technology for locked steel pipe piles |
| CN205914467U (en) * | 2016-08-23 | 2017-02-01 | 中国电建集团核电工程公司 | Hole system is settleed towards sediment to atmospheric pressure hydrocone type |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252327A (en) * | 2020-10-30 | 2021-01-22 | 中铁大桥局集团第四工程有限公司 | Sand cleaning system and method for side pressure slurry tank of steel pipe pile |
| CN112832236A (en) * | 2021-01-08 | 2021-05-25 | 中铁大桥局集团有限公司 | Pipe body structure and soil sampling device suitable for mud jacking tank soil sampling |
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Application publication date: 20190315 |