CN106894421A - The method for dismounting of internal support of foundation pit beam - Google Patents
The method for dismounting of internal support of foundation pit beam Download PDFInfo
- Publication number
- CN106894421A CN106894421A CN201710042148.5A CN201710042148A CN106894421A CN 106894421 A CN106894421 A CN 106894421A CN 201710042148 A CN201710042148 A CN 201710042148A CN 106894421 A CN106894421 A CN 106894421A
- Authority
- CN
- China
- Prior art keywords
- inner support
- support beam
- dismounting
- fracture
- foundation pit
- 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.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The present invention relates to a kind of method for dismounting of internal support of foundation pit beam, comprise the following steps：Temporary support structure is installed in the bottom of the inner support beam of foundation ditch, for supporting the inner support beam；Construct to form fracture to separate the connection of the inner support beam and waterproof of man in the end of the inner support beam, the bottom cage bar positioned at the incision position is retained when fracture is formed；Remove the inner support beam and retain bottom cage bar, the formed shock wave of formed fracture blocking dismounting is passed through during inner support beam is removed and is transferred to waterproof of man；And the bottom cage bar is cut so as to complete the dismounting of internal support of foundation pit beam.The present invention using the end of inner support beam is picked into scalpriform into fracture, using the shock wave produced in fracture blocking demolishing process, it is to avoid shock wave is transferred to the waterproof of man of foundation ditch, greatly reduces influence of the shock wave to waterproof of man, reduces leak risk.
Description
Technical field
The present invention relates to the mechanical removal method of internal support of foundation pit beam, refer in particular to ensure pattern foundation pit supporting structure knot in a kind of demolishing process
The method for dismounting of the inner support beam of structure safety.
Background technology
In foundation ditch mining process, the inner support beam of foundation ditch is played a supporting role, after foundation ditch is excavated and finished, construction building master
During body, the inner support beam needs to remove.When removing inner support beam, cantilever structure will be formed after the end cut-out of inner support beam
, easily there is cave-in accident in part, utilizing larger mechanical removal inner support beam or demolition blasting inner support beam in addition, remove
The shaking force produced in journey is delivered at the waterproof of man of foundation ditch the problems of crack for easily causing waterproof of man.
The content of the invention
A kind of defect it is an object of the invention to overcome prior art, there is provided method for dismounting of internal support of foundation pit beam, solution
Easily there is cave-in accident when certainly inner support beam is removed in the prior art and shaking force is delivered at waterproof of man and easily causes
The problem of waterproof of man cracking.
Realizing the technical scheme of above-mentioned purpose is：
The invention provides a kind of method for dismounting of internal support of foundation pit beam, comprise the following steps：
Temporary support structure is installed in the bottom of the inner support beam of foundation ditch, for supporting the inner support beam；
Construct to form fracture to separate the connection of the inner support beam and waterproof of man in the end of the inner support beam,
Retain the bottom cage bar positioned at the incision position when fracture is formed；
Remove the inner support beam and retain bottom cage bar, formed fracture is passed through during inner support beam is removed
Blocking is removed formed shock wave and is transferred to waterproof of man；And
The bottom cage bar is cut so as to complete the dismounting of internal support of foundation pit beam.
The present invention blocks the shake produced in demolishing process using fracture using the end of inner support beam is picked into scalpriform into fracture
Dynamic ripple, it is to avoid shock wave is transferred to the waterproof of man of foundation ditch, greatly reduces influence of the shock wave to waterproof of man, reduces leakage
Water risk；In addition, also remaining with bottom cage bar in incision position, caving in for inner support beam is prevented by the bottom cage bar for retaining, profit
Keep inner support beam to be connected with the waterproof of man of foundation ditch with bottom cage bar, and temporary support is further supported in the bottom of inner support beam
Structure, both together support inner support beam, reduce the risk that inner support beam is caved in, it is ensured that the process for removing inner support beam is applied
Work safety.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, removing the inner support beam includes：
From the top of the inner support beam to bottom layering reject concrete cover, reject concrete cover so as to
When exposing the reinforcing bar of the inner support beam, the reinforcing bar cutting disassembling that will expose, until exposing bottom cage bar.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, when concrete cover is rejected in layering,
Every layer of thickness of the concrete cover of rejecting is between 100mm to 200mm.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, in the bottom branch of the inner support beam of foundation ditch
If temporary support structure, including：
Sleeper is provided, in sleeper is stacked on the base plate of the foundation ditch, until the sleeper for being stacked stays on the inner support
The bottom of beam, and fill in timber wedge in the sleeper at top and the gap of inner support beam bottom and hold out against so as to form temporary support knot
Structure.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, also include：In the base plate of the foundation ditch
Upper laying stress steel plate, stacked sleeper is supported by the stress steel plate.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, in the temporary support structure and described
Pad sets cushion pad between the bottom of inner support beam.
Internal support of foundation pit beam of the present invention method for dismounting further improvement is that, applied in the end of the inner support beam
Work forms fracture, including：
By artificial chisel except the inner support beam end so as to form fracture, the fracture width for being formed be 100mm extremely
Between 150mm.
Brief description of the drawings
Fig. 1 be internal support of foundation pit beam of the present invention method for dismounting in foundation ditch top view when not removing inner support beam.
Fig. 2 be internal support of foundation pit beam of the present invention method for dismounting in support beam side view.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Refering to Fig. 1, the invention provides a kind of method for dismounting of internal support of foundation pit beam, for removing the support in foundation ditch
Beam, employs the method for dismounting that chisel is picked in sleeper support, fracture shock insulation and layering：In the bottom of inner support beam using sleeper in well
Font falls product and forms temporary support structure, and lower berth steel plate puts forth effort area, top timber wedge and inner support beam in expansion on ground
Bottom hold out against, be prevented from forming cantilever member and cave-in accident occurring after the fracture of inner support beam end；Fracture shock insulation be
After the completion of sleeper support, in inner support beam and waterproof of man position of joints, produced when being removed using incision position blocking inner support beam
Shock wave, greatly reduce influence of the shock wave to waterproof of man, reduce leak risk, incision position also remains with bottom cage bar；
The concrete cover of inner support beam, the reinforcing bar cutting disassembling that will then expose, along inner support beam are rejected in layering in advance when picking chisel
Transversely layered rejecting concrete, finally cuts bottom cage bar so that in demolishing process, bottom cage bar plays itself to inner support beam
Stabilization, it is ensured that remove safety.The method for dismounting to internal support of foundation pit beam of the present invention is illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, the method for dismounting of internal support of foundation pit beam of the invention is used to remove the inner support beam 11 in foundation ditch 10,
The inner support beam 11 is the supporting construction of foundation ditch 10, and in the mining process of foundation ditch 10, inner support beam 11 is constructed by road, inner support
Beam 11 is supported on the inwall of foundation ditch 10.Foundation ditch 10 also includes the waterproof of man 12 for being erected on surrounding, the waterproof of man 12 1
As use interlocking pile, be arranged at the inwall of foundation ditch 10, the interval construction of the medial surface of waterproof of man 12 has waist rail 13, inner support beam
11 end just supports and is connected on waist rail 13, and the two ends of inner support beam 13 are fastenedly connected with corresponding waist rail 13, in foundation ditch
10 excavate completion, it is necessary to inner support beam 11 is removed during beginning construction building agent structure.The invention provides in a kind of foundation ditch
The method for dismounting of support beam is used to solve the problems, such as that inner support beam is removed to supporting construction security implication, that is, avoids being propped up in removing
Influence during support beam to waterproof of man 12.
The method for dismounting of the internal support of foundation pit beam comprises the following steps：
With reference to shown in Fig. 2, temporary support structure 21 is installed in the bottom of the inner support beam 11 of foundation ditch 10, using temporary support
Structure 21 supports inner support beam 11, the temporary support structure 21 located at foundation ditch 10 base plates 14 and inner support beam 11 bottom it
Between, the powerful support of pair of interior support beam 11 is formed, play a part of reinforcing；Quantity, the position of temporary support structure 21 are according in
The span of support beam and the position of port determine；
Constructed the connection to form fracture 22 to separate inner support beam 11 and waterproof of man 12 in the end of inner support beam 11,
Retain the bottom cage bar 23 at fracture 22 when fracture 22 is formed, the bottom cage bar 23 is the most bottom row in inner support beam 11
Reinforcing bar；Fracture 22 is respectively provided with the two ends of inner support beam 11, using fracture 22 by the company of inner support beam 11 and waterproof of man 12
Disconnection is connect, but is not fully disconnected, remain the connection of bottom cage bar 23 so that inner support beam 11 does not turn into cantilever structure
Part, still has bottom cage bar 23 to keep being connected with the waist rail 13 of waterproof of man 12, is that inner support beam 11 plays certain supporting role；
Remove inner support beam 11 and retain bottom cage bar 23, the fracture during inner support beam 11 is removed by being formed
22 blockings are removed formed shock wave and are transferred to waterproof of man 12, it is to avoid remove the shock wave for producing to waterproof of man 12
Influence, reduces leak risk；
Now only leave bottom cage bar 23 in inner support beam 11 not removing, cutting bottom cage bar 23 is so as to complete foundation ditch 10
The dismounting of inner support beam 11.Bottom cage bar is finally cut, cutting operation does not interfere with coupled waterproof of man, it is ensured that intercept water
The stabilization safety of curtain.
The method for dismounting of internal support of foundation pit beam of the invention employs fracture shock insulation and temporary support structure, first with interim
Supporting construction 21 is supported on the bottom of inner support beam 11, is that inner support beam 11 provides support, then at the two ends shape of inner support beam 11
Into fracture, produced shock wave during using fracture cut-off dismounting inner support beam, it is to avoid the peace of vibrations wave action waterproof of man 12
Entirely, though incision position leaves bottom cage bar 23, the shock wave that the connection of the stratum cage bar is transmitted is connected compared to whole inner support beam
It is much smaller in the shock wave transmitted on waist rail, so the blocking effect of fracture, can greatly reduce shock wave to the curtain that intercepts water
The influence of curtain, reduces leak risk, it is ensured that the safety of foundation pit supporting construction.Additionally by the connection for retaining bottom cage bar,
It is prevented from inner support beam to cave in, pair of interior support beam plays certain supporting role, is equipped with facing in inner support beam bottom
When supporting construction, ensure that Stability Analysis of Structures of the inner support beam in demolishing process, it is to avoid occur cave-in accident risk.
Used as a better embodiment of the invention, removing inner support beam 11 includes：From the top of inner support beam 11 to bottom
Concrete cover is rejected in layering, when concrete cover is rejected so as to the reinforcing bar for exposing inner support beam 11, the steel that will expose
Muscle cutting disassembling, untill bottom cage bar 23 is exposed.The part between two fractures 22 is removed when removing inner support beam 11, first
Using the concrete cover for removing placing of reinforcement in machinery rejecting inner support beam 11, cut stirrup and simultaneously reject upper placing of reinforcement, along interior
The horizontal direction of support beam 11 rejects concrete cover, next placing of reinforcement is rejected, untill bottom cage bar is exposed.Using
The method that chisel is picked in layering removes inner support beam 11, can reduce the shock wave produced by removing, and coordinates the setting of fracture 22, effectively
Ensure the structure safety of waterproof of man.It is preferred that when concrete cover is rejected in layering, every layer of concrete cover of rejecting
Thickness is between 100mm to 200mm.
As another better embodiment of the invention, temporary support knot is installed in the bottom of the inner support beam 11 of foundation ditch 10
Structure 21 includes：Sleeper is provided, in sleeper is stacked on the base plate 14 of foundation ditch 10, until the sleeper for being stacked stays on inner support beam 11
Bottom, and fill in timber wedge 25 in the sleeper at top and the gap of the bottom of inner support beam 11 and hold out against so as to form interim branch
Support structure 21.Sleeper support is laid in inner support beam bottom near incision position, the middle part of large span inner support beam and interior branch
Support the intersection of beam.Sleeper use groined type structure, size is 220mm*160mm*1250mm, by the use of stacking sleeper as
Temporary support structure 21, supports inner support beam 11, and timber wedge is utilized in the gap at the top of sleeper and the bottom of inner support beam 11
Son is stoppered, it is ensured that the tight support of temporary support structure 21.It is preferred that stress steel plate 24 is equipped with base plate 14, by receiving
Power steel plate 24 supports stacked sleeper, that is, sleeper is placed on stress steel plate 24 when stacking sleeper, and stress steel plate 24 is used
2000mm*2000mm*10mm, the lifting surface area of temporary support structure, the end of stress steel plate 24 are increased by stress steel plate 24
With the spacing about 150mm of sleeper end.Timber wedge 25 fills in the surrounding of sleeper top.
As another better embodiment of the invention, padded between the bottom of temporary support structure 21 and inner support beam 11
If cushion pad, the shock wave removed and produced during inner support beam 11 is buffered using cushion pad, it is to avoid shock wave causes inner support beam
Rigid collision between 11 bottoms and temporary support structure 21 and destruction is produced to structure, by the setting of cushion pad, Neng Goubao
The structure safety of shield inner support beam 11 and temporary support structure 21.In the case where cushion pad is set, timber wedge is filled in into top
Sleeper and cushion pad between, to ensure that temporary support structure 21 can be held out against in the bottom of inner support beam 11.Cushion pad is used
Quality of rubber materials, with certain elastic deformability, can play cushioning effect to shock wave.
As another better embodiment of the invention, construct to form fracture 22 in the end of inner support beam 11, including：
By artificial chisel except the end of inner support beam 11 is so as to form fracture 22, the width of the fracture 22 for being formed is 100mm to 150mm
Between.When artificial chisel is removed, can be by the way of chisel be picked manually, it would however also be possible to employ small-sized machine picks chisel mode, due to artificial
Cutting can control to pick vibrations produced by chisel, so this picks scalpriform, Bu Huiying smaller into influence during fracture to waterproof of man
Ring the structure safety of waterproof of man.When scalpriform is picked into fracture, the waist rail 13 that is located proximate to of the fracture is set, on waist rail 13 also
It is that can leave part inner support beam structure, the part of the residual is complete in the external wall construction of major structure of construction subsequently without removing
Cheng Hou, as waist rail is embedded in back fill course together.
The present invention is described in detail above in association with accompanying drawing embodiment, those skilled in the art can be according to upper
State it is bright the present invention is made many variations example.Thus, some of embodiment details should not constitute limitation of the invention, this
The scope that invention will be defined using appended claims is used as protection scope of the present invention.
Claims (7)
1. a kind of method for dismounting of internal support of foundation pit beam, it is characterised in that comprise the following steps：
Temporary support structure is installed in the bottom of the inner support beam of foundation ditch, for supporting the inner support beam；
Construct to form fracture to separate the connection of the inner support beam and waterproof of man, in shape in the end of the inner support beam
Into the bottom cage bar retained during fracture positioned at the incision position；
Remove the inner support beam and retain bottom cage bar, formed fracture blocking is passed through during inner support beam is removed
Remove formed shock wave and be transferred to waterproof of man；And
The bottom cage bar is cut so as to complete the dismounting of internal support of foundation pit beam.
2. the method for dismounting of internal support of foundation pit beam as claimed in claim 1, it is characterised in that remove the inner support beam bag
Include：
Concrete cover is rejected from the layering of the top of the inner support beam to bottom, concrete cover is being rejected so as to expose
During the reinforcing bar of the inner support beam, the reinforcing bar cutting disassembling that will expose, until exposing bottom cage bar.
3. the method for dismounting of internal support of foundation pit beam as claimed in claim 2, it is characterised in that concrete cover is rejected in layering
When, every layer of thickness of the concrete cover of rejecting is between 100mm to 200mm.
4. the method for dismounting of internal support of foundation pit beam as claimed in claim 1, it is characterised in that in the bottom of the inner support beam of foundation ditch
Portion installs temporary support structure, including：
Sleeper is provided, in sleeper is stacked on the base plate of the foundation ditch, until the sleeper for being stacked stays on the inner support beam
Bottom, and fill in timber wedge in the sleeper at top and the gap of inner support beam bottom and hold out against so as to form temporary support structure.
5. the method for dismounting of internal support of foundation pit beam as claimed in claim 4, it is characterised in that also include：In the foundation ditch
Stress steel plate is laid on base plate, stacked sleeper is supported by the stress steel plate.
6. the method for dismounting of internal support of foundation pit beam as claimed in claim 1, it is characterised in that in the temporary support structure and
Pad sets cushion pad between the bottom of the inner support beam.
7. the method for dismounting of internal support of foundation pit beam as claimed in claim 1, it is characterised in that in the end of the inner support beam
Place's construction forms fracture, including：
By artificial chisel except the end of the inner support beam is so as to form fracture, the fracture width for being formed is 100mm to 150mm
Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710042148.5A CN106894421A (en) | 2017-01-19 | 2017-01-19 | The method for dismounting of internal support of foundation pit beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710042148.5A CN106894421A (en) | 2017-01-19 | 2017-01-19 | The method for dismounting of internal support of foundation pit beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106894421A true CN106894421A (en) | 2017-06-27 |
Family
ID=59198680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710042148.5A Pending CN106894421A (en) | 2017-01-19 | 2017-01-19 | The method for dismounting of internal support of foundation pit beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106894421A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237344A (en) * | 2017-07-12 | 2017-10-10 | 南通市市政工程设计院有限责任公司 | The quick transformation component and remodeling method of a kind of pressure pipeline |
| CN108612109A (en) * | 2018-04-27 | 2018-10-02 | 中国二十冶集团有限公司 | The carrierless method for dismounting of concrete support beam |
| CN108677963A (en) * | 2018-05-23 | 2018-10-19 | 中铁第四勘察设计院集团有限公司 | A kind of bracing members for base pit engineering stay support joint structure and its construction method |
| CN109667229A (en) * | 2018-10-17 | 2019-04-23 | 中铁二十四局集团安徽工程有限公司 | A kind of contrary sequence method foundation pit top temporary trestle bridge plate method for dismounting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172710A (en) * | 1997-12-16 | 1999-06-29 | Fujita Corp | Method for constructing underground part of steel encased reinforced concrete building |
| CN102094425A (en) * | 2010-12-24 | 2011-06-15 | 中铁六局集团有限公司 | Foundation pit construction method adopting shallow buried depth Larsen steel plate pile as protective cofferdam |
| CN103422508A (en) * | 2013-03-08 | 2013-12-04 | 中国建筑第四工程局有限公司 | Mechanical stuffy demolition method and structure of inner supporting platform structure of deep foundation pit |
| CN103510523A (en) * | 2013-10-24 | 2014-01-15 | 成军 | Sectional cutting and overall craning method for supporting beam in deep foundation pit multilayered reinforced concrete |
| CN103572763A (en) * | 2013-11-18 | 2014-02-12 | 中建二局第三建筑工程有限公司 | Large-span steel support foundation ditch support detaching construction method |
| CN204551485U (en) * | 2015-02-11 | 2015-08-12 | 浙江中成建工集团有限公司 | Semi-inverse method throws support formula foundation ditch combined enclosure structure |
-
2017
- 2017-01-19 CN CN201710042148.5A patent/CN106894421A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172710A (en) * | 1997-12-16 | 1999-06-29 | Fujita Corp | Method for constructing underground part of steel encased reinforced concrete building |
| CN102094425A (en) * | 2010-12-24 | 2011-06-15 | 中铁六局集团有限公司 | Foundation pit construction method adopting shallow buried depth Larsen steel plate pile as protective cofferdam |
| CN103422508A (en) * | 2013-03-08 | 2013-12-04 | 中国建筑第四工程局有限公司 | Mechanical stuffy demolition method and structure of inner supporting platform structure of deep foundation pit |
| CN103510523A (en) * | 2013-10-24 | 2014-01-15 | 成军 | Sectional cutting and overall craning method for supporting beam in deep foundation pit multilayered reinforced concrete |
| CN103572763A (en) * | 2013-11-18 | 2014-02-12 | 中建二局第三建筑工程有限公司 | Large-span steel support foundation ditch support detaching construction method |
| CN204551485U (en) * | 2015-02-11 | 2015-08-12 | 浙江中成建工集团有限公司 | Semi-inverse method throws support formula foundation ditch combined enclosure structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237344A (en) * | 2017-07-12 | 2017-10-10 | 南通市市政工程设计院有限责任公司 | The quick transformation component and remodeling method of a kind of pressure pipeline |
| CN108612109A (en) * | 2018-04-27 | 2018-10-02 | 中国二十冶集团有限公司 | The carrierless method for dismounting of concrete support beam |
| CN108677963A (en) * | 2018-05-23 | 2018-10-19 | 中铁第四勘察设计院集团有限公司 | A kind of bracing members for base pit engineering stay support joint structure and its construction method |
| CN109667229A (en) * | 2018-10-17 | 2019-04-23 | 中铁二十四局集团安徽工程有限公司 | A kind of contrary sequence method foundation pit top temporary trestle bridge plate method for dismounting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106894421A (en) | The method for dismounting of internal support of foundation pit beam | |
| CN101838968B (en) | Double track bridge construction process crossing existing railway operational lines | |
| CN104074199B (en) | Underwater bearing platform construction method | |
| CA2853564C (en) | Undercut excavation method with continuous concrete floors | |
| CN108060683A (en) | A kind of middle weathering geology top-down construction method | |
| CN203361033U (en) | Protective device for intercepting falling rocks of through cut | |
| CN105804748B (en) | A kind of method of block mining Wall ore under open air transport system | |
| CN104404965A (en) | Method for removing reinforced concrete support beams in foundation pit support | |
| CN111119938B (en) | Method for processing karst cave at upper part of tunnel | |
| CN103243665A (en) | Protection method and protection device for blocking deep cutting falling rocks | |
| CN103469806A (en) | Construction method for replacing brick forming die with prefabricated concrete foundation bearing platform side die | |
| CN109778869A (en) | Foundation ditch construction method | |
| CN107201913B (en) | A kind of fine vibration-reducing blasting construction method of cross-over tunnel | |
| CN108915700A (en) | A kind of association type Floor Heave in Roadway administering method | |
| CN109882182A (en) | A kind of extra small clear distance construction method in tunnel | |
| CN110985060A (en) | Protective structure of tunnel upper portion solution cavity | |
| CN106677804A (en) | Gob-side entry retaining roadside support system and construction method thereof | |
| CN106013834B (en) | Device and method for basement increasing layer | |
| CN105926637B (en) | The prestressing force support system and design of a kind of existing subway of protection | |
| Williams et al. | Underhand cut and fill mining as practiced in three deep hard rock mines in the United States | |
| CN206873459U (en) | A kind of large-span steel-reinforced concrete foundation ditch support system | |
| CN115370389A (en) | Construction method for radial steel pipe opposite-top support of collapsed cavity of highway tunnel | |
| CN211777473U (en) | Protective structure of tunnel upper portion solution cavity | |
| CN207554109U (en) | Gold mine Bottom of Stope cuts tunnel filling Concrete false bottom | |
| CN112459086A (en) | Construction method for cleaning top stone of steep side slope adjacent to existing line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170627 |