CN208395848U - Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction - Google Patents
Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction Download PDFInfo
- Publication number
- CN208395848U CN208395848U CN201821021716.XU CN201821021716U CN208395848U CN 208395848 U CN208395848 U CN 208395848U CN 201821021716 U CN201821021716 U CN 201821021716U CN 208395848 U CN208395848 U CN 208395848U
- Authority
- CN
- China
- Prior art keywords
- guide ring
- steel plate
- retaining wall
- plate strip
- steel
- Prior art date
- 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.)
- Active
Links
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The utility model discloses a kind of assembled interim retaining wall of steel of auxiliary pile foundation concrete dado construction.Upper guide ring therein includes being arranged the interior guide ring being fixed in outer guide ring, and multiple steel plate strip pilot holes is formed between upper inside and outside guide ring, and upper inside and outside guide ring is in up-narrow and down-wide tube structure；Multiple steel plate strip correspondences are plugged in steel plate strip pilot hole, and the lower part of each steel plate strip is the basil；The lower guiding coollar of the retaining wall is located in multiple steel plate strips, and lower guide ring includes assembled lower-left guide ring and bottom right guide ring.In construction, first upper outer guide ring is fixed on and has performed concrete dado bottom；Upper interior guiding coollar is located in upper outer guide ring again, then hammers steel plate strip and enters bottom hole, then be successively put into lower guide ring.When concrete dado reaches design strength, then remove the lower guide ring of the bottom.The assembled interim retaining wall of the steel reduces security risk and cost, accelerates construction progress convenient for auxiliary pile foundation concrete dado construction.
Description
Technical field
The utility model belongs to Bored Pile of Bridge field, and in particular to a kind of under the disadvantageous geologic conditions such as Permeable Sand Layers
Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction.
Background technique
Have in the common practice of the construction pile foundation pore-forming of railway, highway bridge main body and enclosed structure pile foundation: mechanical
Pore-forming and manually digging hole.Wherein mechanical hole building site requirements is high, influences on ambient enviroment and works big.In adverse conditions I
The deficiency of mechanical hole building is made up frequently with the form of manually digging hole, but manually digging hole is more demanding to geological conditions, for
It is big that layer of sand etc. easily collapses geology progress manhole borehole security risk, or even can not construct.Therefore, how in landform and geological conditions
It is extremely urgent that the interim retaining wall of manually digging hole that a kind of structure is simple, is easy to dismounting and consolidates safety is designed in the case where complexity.
Utility model content
Utility model aims to solve problems of the prior art, provide a kind of layer of sand it is permeable under the conditions of it is auxiliary
The assembled interim retaining wall of the steel for helping pile foundation concrete dado to construct, the assembled interim retaining wall of the steel are convenient for auxiliary pile foundation concrete dado construction,
Security risk and cost are reduced, is accelerated construction progress.
In order to achieve the above objectives, the utility model adopts the following technical solution:
The assembled interim retaining wall of the steel of pile foundation concrete dado construction, including upper guide ring, steel plate are assisted under the conditions of layer of sand is permeable
Retaining wall and more than one lower guide ring；Wherein, upper guide ring, including in up-narrow and down-wide tube structure upper interior guide ring and
Upper outer guide ring, upper interior guide ring, which is arranged, to be fixed in outer guide ring；Multiple partitions are equipped on the upper interior guide ring, it should
Multiple partitions are resisted against on the inner sidewall of outer guide ring, to form multiple steel between upper interior guide ring and upper outer guide ring
Lath pilot hole；Steel plate strip retaining wall, including multiple steel plate strips, multiple steel plate strip one-to-one correspondence is plugged on the more of guide ring
In a steel plate strip pilot hole, the lower part of each steel plate strip is the basil；Lower guide ring, is set in steel plate strip retaining wall, lower guiding
Ring includes assembled lower-left guide ring and bottom right guide ring.
The assembled interim retaining wall of steel of auxiliary pile foundation concrete dado construction under the conditions of layer of sand as described above is permeable, it is described interior
Guide ring is separate structure, guide ring in guide ring and upper right in the upper left including splicing.
The assembled interim retaining wall of steel of auxiliary pile foundation concrete dado construction under the conditions of layer of sand as described above is permeable, it is described outer
Guide ring is the separate structure being spliced by multiple arcs ring body.
From the above description of the utility model, it can be seen, compared with the existing technology, the utility model has following beneficial to effect
Fruit:
(1) on the utility model guide ring, steel plate strip and lower guide ring basis material intensity and overall dimensions according to geology
Condition can be adjusted at any time, adaptable, meet most of geological condition, and generalization is stronger；
(2) the assembled interim retaining wall cooperation manually digging hole construction of the utility model steel, is fixed under the concrete dado performed
Portion is removed as the gradually intensification of manhole borehole provides temporary support for hole wall until concrete dado pours after a certain period of time, construction
Wall body is stablized in the process, provides more operating times for worker；
(3) the assembled interim retaining wall of the steel of the utility model includes upper guide ring, several steel plate strips and several lower guide rings,
Generally horn-like tubular construction can pour operation and reserve maximum space for manually digging hole and concrete dado.
(4) several steel plate strip lower parts of the assembled interim retaining wall of the steel of the utility model are all made into basil form, are conducive to
It is bigger to be allowed to driving depth for cutting soil.
(5) the assembled interim retaining wall of the steel of the utility model is formed using several steel plate strips, and bar steel plate is easier to from mixed
Solidifying soil is pulled out, and the disturbance to retaining wall body is reduced.
(6) the upper interior guide ring of the assembled interim retaining wall of the steel of the utility model is made of two semi-circular rings, by bolt
It is fixed on outer guide ring, an entirety guiding and support construction is collectively formed, is conducive to dismounting and transhipment, support construction is stablized.
(7) a upper guide ring generally horn-like tube structure shape for the assembled interim retaining wall of the steel of the utility model
Formula is formed with multiple oblique cyclic annular steel bar pilot holes, can assist steel plate strip is oblique to squeeze into the soil body, it is horn-like to meet manually digging hole
The structure type of tubular concrete dado.
(8) the assembled interim retaining wall of the steel of the utility model includes upper guide ring, several steel plate strips and several lower guide rings,
Steel plate strip upper and lower part, which respectively corresponds, to be supported on guide ring and lower guide ring, the interim steel plate that multiple steel plate strips is formed
The soil pressure that retaining wall is subject to circularizes internal force by the ring structure conversion of upper and lower guide ring and offsets.
(9) the assembled interim retaining wall whole component material of the steel of the utility model is all made of steel, and rigidity is big, and intensity is high,
Safety and stability greatly reduces security risk.
(10) the assembled interim retaining wall of the steel of the utility model includes upper guide ring, several steel plate strips and several lower guiding
Ring, structure is simple, easily operated, and worker is easier to receive, and skillfully grasps.
(11) the upper interior guide ring of the steel assembly retaining wall of the utility model and lower guide ring are made of two semicircles, assembled
Retaining wall is made of several steel plate strips, and concrete dado can be removed immediately after pouring, and is reused, is reduced costs.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and constitutes one of the utility model
Point, the exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the utility model
Improper restriction.In the accompanying drawings:
Fig. 1 is the schematic perspective view of the assembled interim retaining wall of the utility model steel；
Fig. 2 is the dimensional decomposition structure diagram of the assembled interim retaining wall of the utility model steel；
Fig. 3 is the dimensional decomposition structure diagram of guide ring on the utility model；
Fig. 4 is the dimensional decomposition structure diagram of interior guide ring on the utility model；
Fig. 5 is the schematic perspective view of guide ring under the utility model；
Fig. 6 is the dimensional decomposition structure diagram of guide ring under the utility model；
Fig. 7 is that the interim steel plate strip panelling construction of the assembled interim retaining wall of the utility model steel is deep to concrete dado design segment
The constructing structure schematic diagram of degree.
Specific embodiment
In order to be clearer and more clear technical problem to be solved in the utility model, technical solution and beneficial effect, with
Under in conjunction with the accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
Example is applied only to explain the utility model, is not used to limit the utility model.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, term is such as used
" first ", " second " or " third " etc. is provided to distinguish different objects, be not use to describe a particular order.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, for orientation
Word, such as using term " center ", " transverse direction ", " longitudinal direction ", "horizontal", " vertical ", "top", "bottom", "inner", "outside", "upper",
The indicating positions such as "lower", "front", "rear", "left", "right", " clockwise ", " counterclockwise " or positional relationship are based on shown in attached drawing
Orientation and positional relationship, and be merely for convenience of narration the utility model and simplify description, rather than indication or suggestion is signified
Device or element must have a particular orientation or be constructed and operated in a specific orientation, so can not be interpreted as limitation this
The specific protection scope of utility model.
In claims of the utility model, specification and above-mentioned attached drawing, unless otherwise specifically limited, term is such as used
" affixed " or " being fixedly connected ", should broadly understood, i.e., between the two without any company of displacement relation and relative rotation relationship
Connect mode, that is to say, that including being unremovably fixedly connected with, being removably secured connection, be linked together and by other dresses
It sets or element is fixedly connected.
In claims of the utility model, specification and above-mentioned attached drawing, such as using term " includes ", " having " and
Their deformation, it is intended that " including but not limited to ".
Illustrate to assist the steel of pile foundation concrete dado construction to spell under the conditions of the utility model layer of sand is permeable now in conjunction with Fig. 1 to Fig. 7
Interim retaining wall is filled, the assembled interim retaining wall of the steel is suitable for the construction of manually digging hole under the disadvantageous geologic conditions such as Permeable Sand Layers.It should
The assembled interim retaining wall of steel includes upper guide ring 10, steel plate strip retaining wall 20 and more than one lower guide ring 30.In the present embodiment
In, upper guide ring 10, which is fixed on, has performed concrete dado bottom.Having performed concrete dado includes first section concrete dado 40 and partial node concrete shield
Wall 50, head section concrete dado 40 are according to geological condition decision generally according to normal manually digging hole construction technology, partial node concrete dado 50
It is no to use the assembled interim panelling construction of the utility model steel.
Guide ring 10 includes upper interior guide ring 11 and upper outer guide ring 12 on the utility model, further includes upper interior guide ring 11
The multiple steel plate strip pilot holes 13 formed between upper outer guide ring 12.The upper interior guide ring 11 and upper outer guide ring 12 are equal
For up-narrow and down-wide horn-like tube structure.
The outer diameter of outer guide ring 12 is less than the internal diameter of concrete dado bottom on the utility model, to be fixed on partial node concrete dado bottom
Portion.In being additionally provided with multiple outside nut holes 122 in the upper outer guiding ring body 121 of guide ring 12 outer on this.
The outer diameter of interior guide ring 11 is less than the internal diameter of upper outer guide ring 12 on the utility model, so that 11 sets of upper interior guide ring
It is located in outer guide ring 12.Upper interior guiding ring body 113 of interior guide ring 11 is extended towards upper outer guide ring 12 on this
There are multiple partitions 112, multiple partition 112 can be directly welded on interior 113 outer peripheral surface of guiding ring body, and the utility model is more
A partition 112 is evenly spaced in upper interior guiding ring body 113, when upper interior guide ring 11 is set in upper outer guide ring
When in 12, multiple partitions 112 are resisted against on the inner sidewall of outer guide ring 12, in upper interior guiding ring body 113 and upper outer to lead
To multiple steel plate strip pilot holes 13 are formed between ring body 121, steel plate strip pilot hole 13 is oblique pilot hole.In this
Multiple female screw holes 111 are additionally provided in upper in the upper interior guiding ring body 113 of guide ring 11, multiple female screw hole 111 is corresponding
Multiple outside nut holes 122 setting of upper outer guide ring 12, to be bolted to connection upper interior guide ring 11 and upper outer guide ring
12, so that an entirety guiding and support construction, guide ring in raising is collectively formed in upper interior guide ring 11 and upper outer guide ring 12
10 overall stability.Further, interior guide ring 11 can be set as separate structure on the utility model, in the present embodiment, on
Interior guide ring 11 is made of guide ring 11B in guide ring 11A in upper left and upper right, so that dismounting is more convenient, efficient.
The utility model steel plate strip retaining wall 20 includes multiple steel plate strip 21, and multiple steel plate strips 21 is spaced corresponding insert one by one
It sets in multiple steel plate strip pilot holes 13 of upper guide ring 10, the lower part of each steel plate strip is made into 211 form of the basil.
Guide ring 30 is set in 20 inside of steel plate strip retaining wall that multiple steel plate strips 21 is formed under the utility model, under described
Guide ring 30 is to dismount simple, efficient separate structure, and the lower guide ring 30 of the separate structure is by lower-left guide ring 31 and the right side
The cyclic structure that lower guide ring 32 is assembled into.Specifically, in the company of being correspondingly provided on lower-left guide ring 31 and bottom right guide ring 32
Fishplate bar 311 is locked corresponding connecting plate 311 by bolt 312, to guarantee the stability of lower 30 splicing construction of guide ring.This reality
With the lower guide ring 30 of the assembled interim retaining wall configuration multiple diameter model of novel steel, diameter model is according to concrete dado tilt angle
It is determined jointly with each attainable depth of borehole.
When interim panelling construction assembled using the utility model steel, upper 10 all constituents of guide ring are first hung in into hole
It is interior, wherein first upper outer guide ring 12 is fixed on and has performed concrete dado bottom, the mode of stopper filling can be used, then successively
Left and right interior guide ring 11A, 11B are mounted to a upper interior guide ring 11, to be set in upper outer guide ring 12, and make to weld
The inner sidewall that several partitions 112 in upper interior 11 outer peripheral surface of guide ring abut against upper outer guide ring 12 is connect, then, by upper interior guiding
The outside nut hole 122 of the corresponding outer guide ring 12 of the female screw hole 111 of ring 11, is tightened using bolt, to improve upper guide ring 10
Overall stability, multiple corresponding inside and outside screw holes 111,122 can be added on upper inside and outside guide ring 11,12.
After the completion of being fixed by the upper guide ring 10 that inside and outside guide ring 11,12 assembles, horn-like tubular construction is formed,
Form several oblique ring steel lath pilot holes 13.Then, multiple steel plate strips 21 is successively inserted into steel plate strip in cruciform symmetry
Pilot hole 13 squeezes into bottom hole using hammer mode, until all steel plate strips 21 cannot be squeezed into again, to form the first depth
Interim steel plate strip retaining wall, carries out the manually digging hole operation in this depth bounds, is successively put into and is somebody's turn to do in 20 inside of steel plate strip retaining wall
The adaptable lower guide ring 30 of the interim steel plate strip retaining wall diameter of first depth, manually digging hole are dug to the basil for leaking out steel plate strip 21
211, hammering steel plate strip 21 is then proceeded to, until it cannot squeeze into again, to form the interim steel plate strip retaining wall of the second depth,
The manually digging hole operation in this depth bounds is carried out, then is successively put into and is mutually fitted with the interim steel plate strip retaining wall diameter of second depth
The lower guide ring 30 answered, manually digging hole are dug to the basil 211 for leaking out steel plate strip 21 again, and so on carry out this process construction,
Until reaching concrete dado design segment depth.
When hole depth reaches design segment depth, steel plate strip 21 must assure that insertion bottom hole not less than 20cm, retains the bottom
Lower guide ring 30A, and backfill covering, successively remove other lower guide rings 30, bind concrete dado reinforcing bar, concrete dado internal model is installed
Plate carries out concrete dado and pours.
The spiral shell of the inside and outside screw hole 111,122 of upper inside and outside guide ring 11,12 is connected under turning round rapidly before concrete dado initial set
Bolt, in dismounting in guide ring 11, pull out steel plate strip 20 according to this, finally remove upper outer guide ring 12.
When concrete dado reaches design strength, manual cleaning covers the bottom hole soil body 60 of the lower guide ring 30A of the bottom,
The lower screw rod 312 connected on lower the lower-left guide ring 31 of guide ring 30 and the connecting plate 311 of bottom right guide ring 32 is turned round, removes this most
The lower guide ring 30A of bottom.All components removed will be cleaned in time, be used convenient for next segment panelling construction.
In order to guarantee that the insertion of steel plate strip 21 angle is consistent with concrete dado gradient, each component should match processing, for the ease of
Manually installed, each component corner angle will polish smooth, and prevent injury operator.It is transported after all assembled detections of component examination are qualified
To scene.The two semi-circular rings of guide ring 11B will use in guide ring 11A and upper right in the upper left of guide ring 11 on composition
The good plate of rigidity, can bend out certain displacement, convenient for removing.When construct larger-diameter borehole operation when, due to upper and lower
When guide ring 10,30 is relatively large in diameter, component is heavier, is unfavorable for manually installed, and multiple arcs can be used in upper and lower guide ring 10,30
Upper and lower guide ring 10,30 specifically vertically can be divided into muti-piece, carried out at the scene by the separate structure that ring body is spliced
Assembling, convenient for carrying in personnel hole, the hanging device that indirect labor's borehole can be used when necessary is coupled.
The preferred embodiment of the utility model has shown and described in above description, as previously described, it should be understood that this is practical new
Type is not limited to forms disclosed herein, and should not be regarded as an exclusion of other examples, and can be used for various other groups
Conjunction, modification and environment, and above-mentioned introduction or the technology of related fields can be passed through within the scope of the inventive concept described herein
Or knowledge is modified.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, then
It all should be in the protection scope of the appended claims for the utility model.
Claims (3)
1. assisting the assembled interim retaining wall of the steel of pile foundation concrete dado construction, which is characterized in that including upper guide ring (10), steel plate strip
Retaining wall (20) and more than one lower guide ring (30)；Wherein, upper guide ring (10), including in the upper of up-narrow and down-wide tube structure
Interior guide ring (11) and upper outer guide ring (12), upper interior guide ring (11), which is arranged, to be fixed in outer guide ring (12)；On described
It is equipped with multiple partitions (112) on interior guide ring (11), multiple partition (112) is resisted against the inner sidewall of outer guide ring (12)
On, to form multiple steel plate strip pilot holes (13) between upper interior guide ring (11) and upper outer guide ring (12)；
Steel plate strip retaining wall (20), including multiple steel plate strips (21), multiple steel plate strip (21) one-to-one correspondence is plugged on guiding
In multiple steel plate strip pilot holes (13) of ring (10), the lower part of each steel plate strip (21) is the basil (211)；
Lower guide ring (30) is set in steel plate strip retaining wall (20), and lower guide ring (30) includes assembled lower-left guide ring
(31) and bottom right guide ring (32).
2. the assembled interim retaining wall of the steel of auxiliary pile foundation concrete dado construction as described in claim 1, which is characterized in that on described
Interior guide ring (11) is separate structure, guide ring (11B) in guide ring (11A) and upper right in the upper left including splicing.
3. the assembled interim retaining wall of the steel of auxiliary pile foundation concrete dado construction as claimed in claim 1 or 2, which is characterized in that institute
Stating outer guide ring (12) is the separate structure being spliced by multiple arcs ring body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821021716.XU CN208395848U (en) | 2018-06-29 | 2018-06-29 | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821021716.XU CN208395848U (en) | 2018-06-29 | 2018-06-29 | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208395848U true CN208395848U (en) | 2019-01-18 |
Family
ID=65130218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821021716.XU Active CN208395848U (en) | 2018-06-29 | 2018-06-29 | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208395848U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972645A (en) * | 2018-06-29 | 2019-07-05 | 中铁二十二局集团第三工程有限公司 | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction and construction method |
| CN110500121A (en) * | 2019-09-20 | 2019-11-26 | 杭州华峰地基基础工程有限公司 | A kind of progressive steel pile casting of deep layer more piece of metro shield protection zone |
| CN110952453A (en) * | 2019-11-25 | 2020-04-03 | 通号建设集团有限公司 | Construction method of abutment structure |
-
2018
- 2018-06-29 CN CN201821021716.XU patent/CN208395848U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972645A (en) * | 2018-06-29 | 2019-07-05 | 中铁二十二局集团第三工程有限公司 | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction and construction method |
| CN110500121A (en) * | 2019-09-20 | 2019-11-26 | 杭州华峰地基基础工程有限公司 | A kind of progressive steel pile casting of deep layer more piece of metro shield protection zone |
| CN110952453A (en) * | 2019-11-25 | 2020-04-03 | 通号建设集团有限公司 | Construction method of abutment structure |
| CN110952453B (en) * | 2019-11-25 | 2021-11-12 | 通号建设集团有限公司 | Construction method of abutment structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208395848U (en) | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction | |
| CN106638640B (en) | Construction method without bottom concrete combined type cofferdam under the conditions of formation geology | |
| CN204253056U (en) | A kind of shield machine export & import reinforcing structure | |
| CN108643192A (en) | Brace in Deep Footing Groove supporting ultralong steel tube column pile construction method | |
| CN105781595B (en) | A kind of rectangle or class rectangle cross-section underground engineering machinery branch tunneling method of construction | |
| CN106149683A (en) | A kind of cast-in-place pile construction method using double casing to pass through deep metalling | |
| CN110004929B (en) | Reusable pulling equipment for steel casing of underwater bored pile | |
| CN109235445B (en) | Steel sheet pile and foundation pit supporting construction method | |
| CN208545763U (en) | A kind of steel pipe pile cofferdam for bridge deepwater foundation | |
| CN204326094U (en) | The polygon steel pile foundation of transmission of electricity steel pipe pole | |
| CN206816278U (en) | The new recyclable supporting steel arch-shelf of horizontal ground settlement and tunnel | |
| CN108729457A (en) | A kind of steel pipe pile cofferdam and its construction method for bridge deepwater foundation | |
| CN106948497B (en) | The connecting joint structure and construction method of circular steel tube concrete post and steel structure girder | |
| CN211368741U (en) | Supporting system in fine sand stratum of Yangtze river coastline | |
| CN103195050B (en) | Construction method of tube-jet combined pile supporting underground wall structure | |
| CN109972645A (en) | Assist the assembled interim retaining wall of the steel of pile foundation concrete dado construction and construction method | |
| CN204040042U (en) | A kind of super large ultra-deep support with manually dug piles structure | |
| CN106759266B (en) | Combine reinforcement diaphragm wall and its construction method | |
| CN203270550U (en) | Pipe pile-jet grouting pile united supporting underground wall structure | |
| CN105926582B (en) | Prefabricated hollow component underground tunneling construction assembly, diaphragm wall and construction method | |
| CN210395319U (en) | But recovery type steel-pipe pile convenient to clearance stake core soil | |
| CN212027274U (en) | Shapping tool type anti-smashing shed for operation in groove of personnel | |
| CN209975527U (en) | Reusable pulling-out equipment for steel casing of underwater cast-in-situ bored pile | |
| CN113338278A (en) | Complex interactive powder fine sand layer super-long large-diameter pile foundation casing and construction method | |
| CN208857814U (en) | A kind of spigot-and-socket drilled pile steel pile casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |