CN106638729B - A kind of Novel steel sheet pile inclinometer pipe protection device for installing - Google Patents
A kind of Novel steel sheet pile inclinometer pipe protection device for installing Download PDFInfo
- Publication number
- CN106638729B CN106638729B CN201710041392.XA CN201710041392A CN106638729B CN 106638729 B CN106638729 B CN 106638729B CN 201710041392 A CN201710041392 A CN 201710041392A CN 106638729 B CN106638729 B CN 106638729B
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- Prior art keywords
- steel sheet
- sheet pile
- protective cover
- inclinometer pipe
- protection device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 230000001681 protective effect Effects 0.000 claims abstract description 64
- 238000005266 casting Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000002689 soil Substances 0.000 description 10
- 239000000284 extract Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (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)
- Structural Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a kind of Novel steel sheet pile inclinometer pipe protection device for installing, including the cylindrical protective cover of semicircular ring（3）, the protective cover（3）Both ends be connected with lug boss（31）, the lug boss（31）With the card slot on steel sheet pile surface is set（9）Cooperation, the protective cover（3）Cavity structure in be provided with inclinometer pipe（2）, the inclinometer pipe（2）With the steel sheet pile（1）It is connected, the inclinometer pipe（2）Bottom coaxial line direction be connected with the casting boots of semicircular platforms shape（10）, the steel sheet pile（1）On be provided with and prevent the protective cover（3）The fixing device slided up and down.A kind of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention; it can ensure that its is without damage by fully wrapped around inclinometer pipe in the construction process; protective cover can also be extracted after construction out and carry out secondary use, reliable technological means is provided to solve the problems, such as that flexible building enclosure inclinometer pipe installation is fragile.
Description
Technical field
The present invention is related to more particularly to a kind of Novel steel sheet pile inclinometer pipe protection device for installing, belongs to deformation observation of maintenance structure
Technical field.
Background technology
Steel sheet pile has intensity high, encounters hard soil layer and is easy to squeeze into；Waterproof, anti-permeability performance are good, disclosure satisfy that deep water
Construction requirement；It is easy to assembly and may be reused；Free from environmental pollution and water source and speed of application is fast, operating expenses is relatively low
The advantages of, it can be used for the permanent structures such as harbour, retaining wall, flood bank；Can be used for controlling flood cutout, bridge construction cofferdam, municipal base
The provisional structures such as water blocking, the retaining wall of Infrastructure engineering；It can be used for controlling flood and prevent from caving in, collapse, the purposes such as quicksand,
Each engineering field in China has a wide range of applications.Steel sheet pile enclosure structure is concerning project subject, construction machinery and constructor
The safety of member.Although the design of steel sheet pile has carried out more believable calculating according to geological mapping data and requirement and has divided
Analysis, but due to the complexity and discreteness of soil layer and current scour, survey data is difficult to reflect the truth of soil layer comprehensively, together
When disturbance and laboratory apparatus error of the soil layer when sampling, hypothesis in design with simplify caused by error etc., can all make steel sheet pile
The practical working situation of execution conditions and structure often can not possibly be completely the same.Therefore, in steel sheet pile, it is necessary to right during use
It is monitored, and grasps the deformation of steel sheet pile in time, and alarm is proposed to the dangerous situation and accident that are likely to occur.Inclinometer pipe is one
Kind is embedded in measurement pipe of the underground for observing the soil body or horizontal displacement, since steel sheet pile is a kind of typical flexible branch
How protection structure ensures the synchronous deformation of inclinometer pipe, so that inclinometer pipe is completely embedded to underground with steel sheet pile, is live prison
Survey that everything goes well with your work carries out needing a technical barrier solving.
Through being retrieved to existing technical literature, Chinese patent application publication No.：CN201261892Y, publication date：
2009.6.24, it describes a kind of " protective device of inclinometer tube of steel sheet pile ", which includes intermediate casting boots, tube bottom row
Native boots, anchor ear, tube bottom casting boots are set to steel plate pile body bottom and on the axis of inclinometer pipe installation site；Intermediate casting boots are set
In steel sheet pile top, and above tube bottom casting boots plumb position；Anchor ear is several to be respectively arranged at inclinometer pipe and pass through
Screw is fixedly connected with steel sheet pile.The invention has two：(1) casting boots only protect part inclinometer pipe, still there is part
Inclinometer pipe is exposed to outside the soil body, and the damage probability of inclinometer pipe is still larger when installation；(2) as the casting boots of protective cover in deviational survey
It after pipe installs, can not take out, the Local deformation rigidity of steel sheet pile can be influenced, lead to the inaccuracy of deviational survey result.
Invention content
The technical problem to be solved by the present invention is to it can be ensured by fully wrapped around inclinometer pipe in the construction process by providing one kind
It is without damage, it can also extract protective cover after construction out and carry out secondary use, it is easy to solve flexible building enclosure inclinometer pipe installation
Damage problem provides the Novel steel sheet pile inclinometer pipe protection device for installing of reliable technological means.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of Novel steel sheet pile inclinometer pipe protection device for installing, including the cylindrical protective cover of semicircular ring, the protective cover
Both ends are connected with lug boss, and the lug boss and the card slot being arranged on steel sheet pile surface coordinate, the cavity structure of the protective cover
In be provided with inclinometer pipe, the inclinometer pipe is connected with the steel sheet pile, and the bottom coaxial line direction of the inclinometer pipe is connected with semicircle
The upper surface of the casting boots of taper type, the lower surface of the protective cover and the casting boots is in close contact, the protective cover it is interior
Diameter is identical as the major part interior diameter of casting boots, and consolidating of preventing the protective cover from sliding up and down is provided on the steel sheet pile
Determine device.
The fixing device includes that the fixation of the both sides on the steel sheet pile surface and positioned at the protective cover top is arranged
Button, the fixing buckle are vertically arranged in parallel and vertical with the steel sheet pile, and grooved hole is opened up on the fixing buckle, described
Slot is used for across on-slip bolt, and the on-slip bolt is contacted with the upper surface of the protective cover.
The number of the slot is N, and wherein N is the integer more than or equal to 2.
Power transmission lid is provided between the lower surface and the upper surface of the protective cover of the on-slip bolt, the power transmission lid includes
Semicircular top plate and the semicircle annulated column cavity under the top plate, the on-slip bolt are contacted with the upper surface of the top plate,
The protective cover is contacted with the lower surface of the top plate, and the semicircle annulated column cavity is located in the cavity structure of the protective cover,
The diameter of the top plate is identical as the overall diameter of the protective cover, overall diameter and the protective cover of the semicircle annulated column cavity
Interior diameter is identical.
The mode that the inclinometer pipe is connected with the steel sheet pile is the surface of the steel sheet pile in the left and right of the inclinometer pipe
Both sides offer symmetrical screw hole, and the inclinometer pipe is fixed by anchor ear, and the both sides of the anchor ear offer through-hole, and screw is successively
Fixed function is played across the through-hole and screw hole.
The number of the screw hole is M, and wherein M is the even number more than 6.
The material of the on-slip bolt is screw-thread steel.
The card slot is 0.8m to 1.5m in the spacing of vertical direction.
Beneficial effects of the present invention：A kind of Novel steel sheet pile inclinometer pipe protection device for installing provided by the invention, the guarantor
Inclinometer pipe is provided in the cavity structure of shield, entire inclinometer pipe is wrapped up by protective cover, can ensure deviational survey in the construction process
Without damage, raising working security is managed, the both ends of the protective cover are connected with lug boss, and the lug boss is with setting in steel plate
The card slot cooperation on stake surface, can also extract protective cover out and carry out secondary use, save construction cost, keep away simultaneously after capable of constructing
The Local deformation rigidity of steel sheet pile can be influenced by exempting from the protective cover not taken out, and lead to the inaccuracy of deviational survey result；The on-slip
It is provided with power transmission lid between the lower surface of bolt and the upper surface of the protective cover, protective cover can be avoided directly to be bolted with on-slip
It touches, and causes protective cover discontinuity, damageable hidden danger.
Description of the drawings
Fig. 1 is a kind of front view of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention；
Fig. 2 is a kind of side view of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention；
Fig. 3 is a kind of A-A sectional views of Novel steel sheet pile inclinometer pipe protection device for installing in Fig. 1；
Fig. 4 is a kind of structural schematic diagram of the fixing buckle of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention；
Fig. 5 is a kind of sectional view of the power transmission lid of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention；
Fig. 6 is the steel plate measured after a kind of Novel steel sheet pile inclinometer pipe protection device for installing of the present invention is implemented in certain engineering
Stake deformation data.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings, and following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figures 1 to 3, a kind of Novel steel sheet pile inclinometer pipe protection device for installing, including the cylindrical protective cover of semicircular ring
3, the both ends of the protective cover 3 are connected with lug boss 31, and the lug boss 31 and the card slot 9 being arranged on steel sheet pile surface coordinate,
Inclinometer pipe 2 is provided in the cavity structure of the protective cover 3, the inclinometer pipe 2 is connected with the steel sheet pile 1, the inclinometer pipe 2
Bottom coaxial line direction be connected with the casting boots 10 of semicircular platforms shape, the lower surface of the protective cover 3 and the casting boots 10
Upper surface is in close contact, and the interior diameter of the protective cover 3 is identical as the major part interior diameter of the casting boots 10, the steel sheet pile 1
On be provided with the fixing device for preventing the protective cover 3 from sliding up and down.
The fixing device includes being arranged in 1 surface of the steel sheet pile and consolidating positioned at the both sides on 3 top of the protective cover
Surely 4 are detained, concrete structure is described as shown in figure 4, the fixing buckle 4 is vertically arranged in parallel and vertical with the steel sheet pile 1
Grooved hole 41 is opened up on fixing buckle 4, the slot 41 is used for across on-slip bolt 5, and the on-slip bolt 5 is upper with the protective cover 3
Surface contacts.
The number of the slot 41 is N, and wherein N is integer more than or equal to 2, preferably 2.
It is provided with power transmission lid 6 between the lower surface and the upper surface of the protective cover 3 of the on-slip bolt 5, concrete structure is such as
Shown in Fig. 5, the power transmission lid 6 includes semicircular top plate 61 and the semicircle annulated column cavity 62 under the top plate 61, described
On-slip bolt 5 is contacted with the upper surface of the top plate 61, and the protective cover 3 is contacted with the lower surface of the top plate 61, the semicircle
Annulated column cavity 62 is located in the cavity structure of the protective cover 3, the overall diameter phase of the diameter of the top plate 61 and the protective cover 3
Together, the overall diameter of the semicircle annulated column cavity 62 is identical as the interior diameter of the protective cover 3.
The mode that the inclinometer pipe 2 is connected with the steel sheet pile 1 is the surface of the steel sheet pile 1 in the inclinometer pipe 2
The left and right sides offers symmetrical screw hole, and the inclinometer pipe 2 is fixed by anchor ear 7, and the both sides of the anchor ear 7 offer through-hole,
Screw 8 sequentially passes through the through-hole and screw hole plays fixed function.
The number of the screw hole is M, and wherein M is even number more than 6, preferably 12.
The material of the on-slip bolt 5 is screw-thread steel.
The card slot 9 is 0.8m to 1.5m, preferably 1m in the spacing of vertical direction.
Specific implementation step is：
The first step：The characteristics of according to institute's monitoring works, determines position and the length of the installation of inclinometer pipe 2.Deviational survey is installed
The steel sheet pile 1 of pipe 2 is before being inserted into the soil body, and 2 installation site of inclinometer pipe, the two several screw holes of sidetracking on steel sheet pile 1 will be several
Anchor ear 7 is set on the pipe shaft of inclinometer pipe 2, and the both sides of anchor ear 7 are equipped with through-hole, and screw 8 passes through the screw hole of through-hole and steel sheet pile 1
It is fixedly connected；
Second step：Casting boots 10 are arranged on the axis of 2 installation site of inclinometer pipe, are fixed by welding on steel sheet pile 1；
Determine that the length of protective cover 3, protective cover 3 are spliced by more piece protective cover according to 2 length of inclinometer pipe, 3 length of protective cover can
It adjusts, device is flexible, is not limited by 2 depth of burying of inclinometer pipe, and the lug boss 31 at 3 both ends of protective cover is by being inserted into along inclinometer pipe 2
1 meter of card slot 9 is divided between buried depth direction to fix with steel sheet pile 1,3 bottom of protective cover with casting boots 10 are seamless is close to；
Third walks：On the surface of steel sheet pile 1, two fixing buckles 4 are welded in the top both sides for being located at protective cover 3, fixing buckle
The number of the apertures in alignment of slot 41, slot 41 is set as two, and power transmission lid 6 is covered in 3 open top of protective cover, solid
Surely two on-slip bolts 5 are penetrated in button 4, and protective cover 3 is locked by power transmission lid 6.After check device fixation is errorless, steel sheet pile 1 is inserted into
The soil body；
4th step：It is to be installed there is the steel sheet pile 1 of inclinometer pipe 2 to be inserted into the designated position in the soil body after, remove 5 He of on-slip bolt
Power transmission lid 6 extracts movable protective cover 3 out, after inclinometer pipe 2 stands 7 days, starts the initial value for measuring inclinometer pipe 2.
When building urban road in certain riverfront Mud Ground, the building enclosure using steel sheet pile as roadbed, steel sheet pile
Buried depth is 15m.Fig. 6 gives accumulation displacement of the steel sheet pile in the different durations measured by the inclinometer pipe installed using the present invention, by
Figure as can be seen that installed inclinometer pipe not only obtains the partial data for the different depth that steel sheet pile changed with the construction stage, and
Its deformation response is consistent with the influence characteristic of work progress, illustrates that inclinometer pipe institute measured data reflects that steel sheet pile is true in the soil body
The reliability of deformation state.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of Novel steel sheet pile inclinometer pipe protection device for installing, it is characterised in that：Including the cylindrical protective cover of semicircular ring (3),
The both ends of the protective cover (3) are connected with lug boss (31), the lug boss (31) and the card slot (9) on steel sheet pile surface are arranged
Coordinate, inclinometer pipe (2), the inclinometer pipe (2) and the steel sheet pile (1) phase are provided in the cavity structure of the protective cover (3)
Even, the bottom coaxial line direction of the inclinometer pipe (2) is connected with the casting boots (10) of semicircular platforms shape, under the protective cover (3)
Surface and the upper surface of the casting boots (10) are in close contact, the interior diameter of the protective cover (3) and the casting boots (10)
Major part interior diameter is identical, and the fixing device for preventing the protective cover (3) from sliding up and down is provided on the steel sheet pile (1).
2. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 1, it is characterised in that：The fixation
Device includes the fixing buckle (4) that the both sides on the steel sheet pile (1) surface and positioned at the protective cover (3) top are arranged, described
Fixing buckle (4) is vertically arranged in parallel and vertical with the steel sheet pile (1), and grooved hole is opened up on the fixing buckle (4)
(41), the slot (41) is used for across on-slip bolt (5), and the on-slip bolt (5) contacts with the upper surface of the protective cover (3).
3. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 2, it is characterised in that：The slot
(41) number is N, and wherein N is the integer more than or equal to 2.
4. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 2 or 3, it is characterised in that：It is described
Power transmission lid (6) is provided between the lower surface and the upper surface of the protective cover (3) of on-slip bolt (5), the power transmission lid (6) includes
Semicircular top plate (61) and the semicircle annulated column cavity (62) under the top plate (61), the on-slip bolt (5) and the top
The upper surface of plate (61) contacts, and the protective cover (3) contacts with the lower surface of the top plate (61), the semicircle annulated column cavity
(62) it is located in the cavity structure of the protective cover (3), the overall diameter phase of the diameter and the protective cover (3) of the top plate (61)
Together, the overall diameter of the semicircle annulated column cavity (62) is identical as the interior diameter of the protective cover (3).
5. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 1, it is characterised in that：The deviational survey
The mode that pipe (2) is connected with the steel sheet pile (1) is the left and right sides of the surface in the inclinometer pipe (2) of the steel sheet pile (1)
Symmetrical screw hole is offered, the inclinometer pipe (2) is fixed by anchor ear (7), and the both sides of the anchor ear (7) offer through-hole, spiral shell
Nail (8) sequentially passes through the through-hole and screw hole plays fixed function.
6. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 5, it is characterised in that：The screw
The number in hole is M, and wherein M is the even number more than 6.
7. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 2, it is characterised in that：The on-slip
The material of bolt (5) is screw-thread steel.
8. a kind of Novel steel sheet pile inclinometer pipe protection device for installing according to claim 1, it is characterised in that：The card slot
(9) it is 0.8m to 1.5m in the spacing of vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041392.XA CN106638729B (en) | 2017-01-20 | 2017-01-20 | A kind of Novel steel sheet pile inclinometer pipe protection device for installing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041392.XA CN106638729B (en) | 2017-01-20 | 2017-01-20 | A kind of Novel steel sheet pile inclinometer pipe protection device for installing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106638729A CN106638729A (en) | 2017-05-10 |
| CN106638729B true CN106638729B (en) | 2018-08-17 |
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| CN201710041392.XA Expired - Fee Related CN106638729B (en) | 2017-01-20 | 2017-01-20 | A kind of Novel steel sheet pile inclinometer pipe protection device for installing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109113083B (en) * | 2018-08-29 | 2021-01-05 | 中铁隧道局集团有限公司 | Steel sheet pile cofferdam inclinometer pipe combination and embedding method |
| CN109341659B (en) * | 2018-11-06 | 2020-11-24 | 福州宇卓科技有限公司 | Installation method of inclinometer pipe protection device |
| CN109610529A (en) * | 2018-12-28 | 2019-04-12 | 中交天津港湾工程研究院有限公司 | A kind of deep layer inclinometer tube of steel sheet pile installation auxiliary device and its construction method |
| CN111778964B (en) * | 2020-07-24 | 2022-04-12 | 中国建筑第八工程局有限公司 | Foundation pit hollow support pile, construction method thereof and foundation pit support structure |
| CN112647546A (en) * | 2020-12-31 | 2021-04-13 | 华南理工大学 | Device for monitoring deformation of steel sheet pile and installation and monitoring method thereof |
| CN114263224A (en) * | 2022-01-05 | 2022-04-01 | 中交四航工程研究院有限公司 | Steel pipe pile side friction resistance detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10245845A (en) * | 1997-03-07 | 1998-09-14 | Kawasaki Steel Corp | Method for measuring inclination of placing steel sheet pile |
| CN201261892Y (en) * | 2008-09-18 | 2009-06-24 | 中船勘察设计研究院 | Protection device for inclinometer tube of steel sheet pile |
| CN201265163Y (en) * | 2008-09-18 | 2009-07-01 | 中船勘察设计研究院 | Protective device for metal sheet pile side direction soil pressure sensor |
| CN202141447U (en) * | 2011-07-21 | 2012-02-08 | 中铁十一局集团有限公司 | Surface strain gauge mounting support and protecting device combination for steel structure |
| CN105239548A (en) * | 2015-09-30 | 2016-01-13 | 河海大学 | Mounting and fixing device for inclinometer casing |
| CN205276336U (en) * | 2016-01-04 | 2016-06-01 | 杭州科技职业技术学院 | A protection device that is used for deep basal pit underground continuous wall construction midboard body examination pipe chute |
-
2017
- 2017-01-20 CN CN201710041392.XA patent/CN106638729B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10245845A (en) * | 1997-03-07 | 1998-09-14 | Kawasaki Steel Corp | Method for measuring inclination of placing steel sheet pile |
| CN201261892Y (en) * | 2008-09-18 | 2009-06-24 | 中船勘察设计研究院 | Protection device for inclinometer tube of steel sheet pile |
| CN201265163Y (en) * | 2008-09-18 | 2009-07-01 | 中船勘察设计研究院 | Protective device for metal sheet pile side direction soil pressure sensor |
| CN202141447U (en) * | 2011-07-21 | 2012-02-08 | 中铁十一局集团有限公司 | Surface strain gauge mounting support and protecting device combination for steel structure |
| CN105239548A (en) * | 2015-09-30 | 2016-01-13 | 河海大学 | Mounting and fixing device for inclinometer casing |
| CN205276336U (en) * | 2016-01-04 | 2016-06-01 | 杭州科技职业技术学院 | A protection device that is used for deep basal pit underground continuous wall construction midboard body examination pipe chute |
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| CN106638729A (en) | 2017-05-10 |
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