CN108457666A - A kind of liftable adjustable type tunnel multi-step excavates rack - Google Patents
A kind of liftable adjustable type tunnel multi-step excavates rack Download PDFInfo
- Publication number
- CN108457666A CN108457666A CN201810230066.8A CN201810230066A CN108457666A CN 108457666 A CN108457666 A CN 108457666A CN 201810230066 A CN201810230066 A CN 201810230066A CN 108457666 A CN108457666 A CN 108457666A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- rack
- adjustable type
- fixed
- supporting 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.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/122—Working or loading platforms
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a kind of liftable adjustable type tunnel multi-steps to excavate rack, including support system, vertical lift system, operation platform system and mobile system.Support system is used to support vertical lift system and operation platform system, and operation platform system is set to the top of vertical lift system, and mobile system drives the overall movement of rack；Vertical lift system includes the fixed supporting steel pipe of lifting positioning, adjusts supporting steel pipe and the first bolt, the lower end of the fixed supporting steel pipe of lifting positioning is fixedly connected with support system, the upper end that supporting steel pipe is fixed in lifting positioning is inserted in adjusting supporting steel pipe, and the circular hole that several limits are vertically correspondingly provided on fixed supporting steel pipe and adjusting supporting steel pipe is positioned in lifting.Liftable adjustable type of the present invention tunnel multi-step excavates rack due to liftable rack, and the working space of bigger is provided for face mucking machine equipment, reduces the activity duration of slagging tap.
Description
Technical field
The present invention relates to drilling operation rack is excavated in drilling and blasting method highway, railway tunnel construction, and in particular to one kind can rise
It drops adjustable type tunnel multi-step and excavates rack.
Background technology
Drilling and blasting method excavation is mostly used in highway, railway tunnel construction greatly at present, in the numerous excavation methods in tunnel, with step
Method is most widely used.In recent years, more cave-in accident occurs during domestic and international constructing tunnel, causes larger casualties
And property loss.Under severe security situation, each side that takes part in building especially payes attention to tunnel safety, and multiselect is with three in excavation method
Rank multistep or multi-step multistep are excavated, and bench excavation height is reduced, and short drilling depth, multi-cycle, early closing is taken to reinforce constructing tunnel
Safety.
Traditional two bench excavation racks can meet jewel hole and blow out that rear drag-out slag car is current and follow-up whitewashing is worked continuously, using three
Step multistep or multi-step multistep are excavated, and rack levels cannot be satisfied jewel hole and blow out rear drag-out slag car passage and follow-up continuous make of whitewashing
Industry, rack will be excavated by needing is moved to rear from face, can be normally carried out the subsequent jobs such as slag tap, whitewash, influence each road
Activity time.For actual conditions, need to design a kind of Liftable type tunnel multi-step excavation rack.
Invention content
In view of this, the purpose of the present invention is to provide a kind of liftable adjustable type tunnel multi-steps to excavate rack.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of liftable adjustable type tunnel of the invention multi-step excavates rack, including support system, vertical lift system, operation are flat
Platform system and mobile system；Support system is used to support vertical lift system and operation platform system, and operation platform system is set to
The top of vertical lift system, mobile system drive the overall movement of rack；Vertical lift system includes the fixed branch of lifting positioning
It supports steel pipe, adjust supporting steel pipe and the first bolt, the lower end of the fixed supporting steel pipe of lifting positioning is fixedly connected with support system, is risen
The upper end of the fixed supporting steel pipe of drop positioning, which is inserted in, to be adjusted in supporting steel pipe, is positioned fixed supporting steel pipe in lifting and is adjusted branch
The circular hole of several limits is vertically correspondingly provided on support steel pipe, the first bolt a pair of of circular hole installed therein is interior with connection
The fixed supporting steel pipe of lifting positioning and adjusting supporting steel pipe.
Further, support system includes pedestal, vertical supporting frame and horizontal shore, the lower end and bottom of vertical supporting frame
Seat is fixedly connected, the horizontally-supported top for being erected at vertical supporting frame.
Further, pedestal includes the two rows of I-steel for being located at bottom, and vertical supporting frame includes steel pipe, steel pipe and lower bottom
The I-steel welding of seat, the upper end of steel pipe and the horizontal shore of top weld.
Further, horizontal shore is welded using five row's steel pipes and vertical supporting frame.
Further, the lower end of the fixed supporting steel pipe of lifting positioning and the I-steel of bottom are welded and fixed, and adjust supporting steel
The upper end of pipe and the horizontal shore of top weld.
Further, operation platform system includes longitudinal steel pipe, lateral steel pipe and bar-mat reinforcement, longitudinal steel pipe and lateral steel pipe
It is staggered, bar-mat reinforcement is laid on above longitudinal steel pipe and lateral steel pipe.
Further, operation platform system further includes the extension type platform being arranged at top.
Further, extension type platform includes longitudinally fixed steel pipe, longitudinally adjust steel pipe and the second bolt, longitudinally adjust
Steel pipe is plugged in fixed steel pipe and adjusts the length that longitudinally adjust steel pipe is inserted into longitudinally fixed steel pipe by the second bolt.
Further, the first bolt and the second bolt are reinforcing bar bolt.
The beneficial effects of the present invention are：Liftable adjustable type of the present invention tunnel multi-step excavates rack due to liftable platform
Frame is face mucking machine equipment（Excavator, dump truck, loading machine）The working space for providing bigger, reduces
The slag activity duration.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is that liftable adjustable type of the present invention tunnel multi-step excavates rack cross-sectional view.
Fig. 2 is that liftable adjustable type of the present invention tunnel multi-step excavates rack skiagraph.
Fig. 3 is that liftable adjustable type of the present invention tunnel multi-step excavates cross-sectional view after rack lifting.
Fig. 4 is that liftable adjustable type of the present invention tunnel multi-step excavates skiagraph after rack lifting.
Fig. 5 is the vertical lift system structural schematic diagram that liftable adjustable type of the present invention tunnel multi-step excavates rack.
Fig. 6 is the telescopic platform structure schematic diagram of liftable adjustable type of the present invention tunnel multi-step excavation rack.
In figure, 2 be vertical lift system, and 3 be operation platform system, and 21 fix supporting steel pipe for lifting positioning, and 22 be to adjust
Supporting steel pipe is saved, 23 be the first bolt, and 11 be I-steel, and 31 be bar-mat reinforcement, and 32 be extension type platform, and 33 be longitudinally fixed steel
Pipe, 34 be longitudinally adjust steel pipe, and 35 be the second bolt.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, so that those skilled in the art can be with
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
It please combines together shown in Fig. 1 to Fig. 6, it includes branch that a kind of liftable adjustable type of the invention tunnel multi-step, which excavates rack,
Support system, vertical lift system 2, operation platform system 3 and mobile system, support system are used to support 2 He of vertical lift system
Operation platform system 3, operation platform system 3 are set to the top of vertical lift system 2, and mobile system drives the whole of rack to move
It is dynamic.Vertical lift system 2 includes the fixed supporting steel pipe 21 of lifting positioning, adjusts supporting steel pipe 22 and the first bolt 23, and lifting is fixed
The lower end that supporting steel pipe 21 is fixed in position is fixedly connected with support system, and the upper end that supporting steel pipe 21 is fixed in lifting positioning is inserted in tune
It saves in supporting steel pipe 22, positions in lifting and be vertically correspondingly provided on fixed supporting steel pipe 21 and adjusting supporting steel pipe 22
The circular hole of several limits, 23 a pair of of circular hole installed therein of the first bolt is interior to lift positioning 21 He of fixed supporting steel pipe with connection
Supporting steel pipe 22 is adjusted, by adjusting the height of steel pipe is adjusted to realize the lifting of rack.
Support system includes pedestal, vertical supporting frame and horizontal shore, and the lower end of vertical supporting frame is fixed with pedestal to be connected
It connects, the horizontally-supported top for being erected at vertical supporting frame.
Pedestal includes the two rows of I-steel 11 for being located at bottom, and vertical supporting frame includes steel pipe, the work of steel pipe and lower base
Word steel 11 welds, and the upper end of steel pipe and the horizontal shore of top weld.
Horizontal shore is welded using five row's steel pipes and vertical supporting frame.
The I-steel 11 for the lower end and bottom that supporting steel pipe 21 is fixed in lifting positioning is welded and fixed, and adjusts supporting steel pipe 22
The horizontal shore of upper end and top welds.
Operation platform system 3 includes longitudinal steel pipe, lateral steel pipe and bar-mat reinforcement 31, and longitudinal steel pipe and lateral steel pipe are staggeredly set
It sets, bar-mat reinforcement 31 is laid on above longitudinal steel pipe and lateral steel pipe.
Operation platform system 3 further includes the extension type platform 32 being arranged at top, and extension type platform 32 can be transversely
Extend with longitudinal expansion or collapses to change platform size.
Extension type platform 32 includes longitudinally fixed steel pipe 33, longitudinally adjust steel pipe 34 and the second bolt 35, longitudinally adjust
Steel pipe 34, which is plugged in longitudinally fixed steel pipe 33 and adjusts longitudinally adjust steel pipe 34 by the second bolt 35, is inserted into longitudinally fixed steel
The length of pipe 33.
Mobile system includes mainly 11 notch of I-steel being installed under rack cross-brace steel pipe, is assisted by loading machine
Carry out the movement of rack.
In the present embodiment, the first bolt 23 and the second bolt 35 are reinforcing bar bolt.
The concrete operations flow that liftable adjustable type of the present invention tunnel multi-step excavates rack is：（1）It is in place to excavate rack,
After the progress of top bar place is smooth, rack is moved to by face using loading machine, face carries out jewel hole, powder charge.
（2）It is moved to middle step by rack is excavated using loading machine, is coordinated using loading machine and excavates rack jacking system, it will
It excavates rack to rise, carries out blowing out operation of slagging tap.
（3）Coordinated using loading machine and excavate rack jacking system, will excavate rack reduces, and is moved to face, is stood
Frame and spray operation.
（4）According to above-mentioned（1）Extremely（3）Repetitive cycling.
The present invention has the following advantages compared with existing excavation rack：（1）Due to liftable rack, slag tap for face
Mechanical equipment（Excavator, dump truck, loading machine）The working space for providing bigger, reduces the activity duration of slagging tap.
（2）It relieves multi-step and excavates rack processing limitation, rack levels, width are no longer influenced by limitation, are jewel hole, vertical
Frame, spray operation provide more convenient operating platform and space, reduce the activity duration of the above process.
（3）Solve the problems, such as that inverted arch is excavated is influenced by staging position is excavated, and is accelerated inverted arch operation, is further ensured that and faces upward
Encircle safe step pitch.
（4）It is suitable for country rock and quickly changes the conversion of section excavation method process, when country rock improves, using rack lifting, adjust
Section system can be changed to two bench excavation racks, when country rock is deteriorated, can be changed to remaining core soil in advance using rack lifting, regulating system
Three steps, seven step excavates rack or four step multisteps excavate rack.
（5）It is adjusted using Liftable type and excavates rack, more working spaces can be created to subsequent handling, improve work effect
Rate shortens circulation time.
It is excavated and is illustrated with three steps, seven step, rack is excavated using liftable adjustable type of the present invention tunnel multi-step and is opened with tradition
It is as follows to dig rack circulation time operation contrast table：
| Project | Drillhole blasting（h） | It slags tap（h） | Just spray（h） | Anchor pole, stand（h） | Multiple spray（h） | It amounts to（h） |
| Tradition excavates rack | 2.5 | 7.5 | 1.5 | 5.5 | 4.0 | 21 |
| Liftable type of the present invention, which is adjusted, excavates rack | 2.0 | 5.5 | 1.5 | 4.5 | 3.5 | 17 |
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, and protection scope of the present invention is not
It is limited to this.Those skilled in the art on the basis of the present invention made by equivalent substitute or transformation, the present invention guarantor
Within the scope of shield.Protection scope of the present invention is subject to claims.
Claims (9)
1. a kind of liftable adjustable type tunnel multi-step excavates rack, it is characterised in that:Including support system, vertical lift system
System, operation platform system and mobile system；The support system is used to support the vertical lift system and the operating platform
System, the operation platform system are set to the top of the vertical lift system, and the whole of mobile system driving rack moves
It is dynamic；The vertical lift system includes the fixed supporting steel pipe of lifting positioning, adjusts supporting steel pipe and the first bolt, and the lifting is fixed
The lower end of the fixed supporting steel pipe in position is fixedly connected with the support system, and the upper end of the fixed supporting steel pipe of lifting positioning plugs
In in the adjusting supporting steel pipe, fixed supporting steel pipe and the adjusting supporting steel pipe upper edge side vertically are positioned in the lifting
To the circular hole for being correspondingly provided with several limits, positioned in first bolt a pair of of circular hole installed therein with connecting the lifting
Fixed supporting steel pipe and the adjusting supporting steel pipe.
2. liftable adjustable type according to claim 1 tunnel multi-step excavates rack, it is characterised in that:The support system
System includes pedestal, vertical supporting frame and horizontal shore, and the lower end of the vertical supporting frame is fixedly connected with the pedestal, described
The horizontally-supported top for being erected at the vertical supporting frame.
3. liftable adjustable type according to claim 2 tunnel multi-step excavates rack, it is characterised in that:The pedestal packet
The two rows of I-steel for being located at bottom are included, the vertical supporting frame includes steel pipe, and the I-steel welding of steel pipe and lower base is described
The upper end of steel pipe and the horizontal shore of top weld.
4. liftable adjustable type according to claim 3 tunnel multi-step excavates rack, it is characterised in that:The horizontal branch
Support is welded using five row's steel pipes and the vertical supporting frame.
5. liftable adjustable type according to claim 4 tunnel multi-step excavates rack, it is characterised in that:The lifting is fixed
The lower end of the fixed supporting steel pipe in position and the I-steel of bottom are welded and fixed, the level of the upper end and top for adjusting supporting steel pipe
Supporting rack welds.
6. liftable adjustable type according to claim 1 tunnel multi-step excavates rack, it is characterised in that:The operation is flat
Platform system includes longitudinal steel pipe, lateral steel pipe and bar-mat reinforcement, and the longitudinal direction steel pipe and the lateral steel pipe are staggered, the steel
Muscle net laying is located above longitudinal steel pipe and the lateral steel pipe.
7. liftable adjustable type according to claim 6 tunnel multi-step excavates rack, it is characterised in that:The operation is flat
Platform system further includes the extension type platform being arranged at top.
8. liftable adjustable type according to claim 7 tunnel multi-step excavates rack, it is characterised in that:It is described scalable
Formula platform includes longitudinally fixed steel pipe, longitudinally adjust steel pipe and the second bolt, and the longitudinally adjust steel pipe is plugged in the fixation
The length that the longitudinally adjust steel pipe is inserted into the longitudinally fixed steel pipe is adjusted in steel pipe and by second bolt.
9. liftable adjustable type according to claim 8 tunnel multi-step excavates rack, it is characterised in that:Described first inserts
Pin and second bolt are reinforcing bar bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810230066.8A CN108457666A (en) | 2018-03-20 | 2018-03-20 | A kind of liftable adjustable type tunnel multi-step excavates rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810230066.8A CN108457666A (en) | 2018-03-20 | 2018-03-20 | A kind of liftable adjustable type tunnel multi-step excavates rack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108457666A true CN108457666A (en) | 2018-08-28 |
Family
ID=63237263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810230066.8A Pending CN108457666A (en) | 2018-03-20 | 2018-03-20 | A kind of liftable adjustable type tunnel multi-step excavates rack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108457666A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723445A (en) * | 2019-02-01 | 2019-05-07 | 重庆工商职业学院 | Parallel three steps full section of tunnel entirety driving method |
| CN110500113A (en) * | 2019-09-20 | 2019-11-26 | 中铁二局第二工程有限公司 | A kind of micro- bench excavation combination rack in tunnel and the micro- bench excavation method in tunnel |
| CN110714777A (en) * | 2019-10-15 | 2020-01-21 | 中铁隧道集团二处有限公司 | Portable combined assembling excavation support rack suitable for multiple step method |
| CN111577327A (en) * | 2020-04-28 | 2020-08-25 | 中国一冶集团有限公司 | Device for adjusting size of tunnel excavation trolley |
| CN112360498A (en) * | 2020-11-25 | 2021-02-12 | 国家电网有限公司 | Underground cavern moving operation platform and operation method thereof |
| CN113738393A (en) * | 2021-09-06 | 2021-12-03 | 中铁开发投资集团有限公司 | Construction device and method for shallow-buried drilling and blasting method of urban rail transit in downtown area |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202090923U (en) * | 2011-06-21 | 2011-12-28 | 中铁十二局集团第一工程有限公司 | Adjustable tunnel excavation rack |
| CN202810885U (en) * | 2012-08-29 | 2013-03-20 | 中铁四局集团第二工程有限公司 | Tunnel excavation support bench |
| CN203769796U (en) * | 2014-04-09 | 2014-08-13 | 中国十九冶集团有限公司 | Multifunctional work platform for tunnel |
| CN105697029A (en) * | 2016-02-25 | 2016-06-22 | 中铁十八局集团有限公司 | Multi-purpose drilling and excavating trolley for single track railway tunnel |
| CN205605220U (en) * | 2016-05-15 | 2016-09-28 | 中国水利水电第七工程局有限公司 | A adjustable construction platform for work is strutted in tunnel |
| CN106368714A (en) * | 2015-07-24 | 2017-02-01 | 中国铁建大桥工程局集团有限公司 | Tire type automatic lifting assembly rack for tunnel excavation construction |
| CN107269298A (en) * | 2017-07-24 | 2017-10-20 | 国家电网公司 | A kind of tunnel construction trolley |
| CN208010356U (en) * | 2018-03-20 | 2018-10-26 | 中建隧道建设有限公司 | A kind of liftable adjustable type tunnel multi-step excavates rack |
-
2018
- 2018-03-20 CN CN201810230066.8A patent/CN108457666A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202090923U (en) * | 2011-06-21 | 2011-12-28 | 中铁十二局集团第一工程有限公司 | Adjustable tunnel excavation rack |
| CN202810885U (en) * | 2012-08-29 | 2013-03-20 | 中铁四局集团第二工程有限公司 | Tunnel excavation support bench |
| CN203769796U (en) * | 2014-04-09 | 2014-08-13 | 中国十九冶集团有限公司 | Multifunctional work platform for tunnel |
| CN106368714A (en) * | 2015-07-24 | 2017-02-01 | 中国铁建大桥工程局集团有限公司 | Tire type automatic lifting assembly rack for tunnel excavation construction |
| CN105697029A (en) * | 2016-02-25 | 2016-06-22 | 中铁十八局集团有限公司 | Multi-purpose drilling and excavating trolley for single track railway tunnel |
| CN205605220U (en) * | 2016-05-15 | 2016-09-28 | 中国水利水电第七工程局有限公司 | A adjustable construction platform for work is strutted in tunnel |
| CN107269298A (en) * | 2017-07-24 | 2017-10-20 | 国家电网公司 | A kind of tunnel construction trolley |
| CN208010356U (en) * | 2018-03-20 | 2018-10-26 | 中建隧道建设有限公司 | A kind of liftable adjustable type tunnel multi-step excavates rack |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723445A (en) * | 2019-02-01 | 2019-05-07 | 重庆工商职业学院 | Parallel three steps full section of tunnel entirety driving method |
| CN110500113A (en) * | 2019-09-20 | 2019-11-26 | 中铁二局第二工程有限公司 | A kind of micro- bench excavation combination rack in tunnel and the micro- bench excavation method in tunnel |
| CN110714777A (en) * | 2019-10-15 | 2020-01-21 | 中铁隧道集团二处有限公司 | Portable combined assembling excavation support rack suitable for multiple step method |
| CN111577327A (en) * | 2020-04-28 | 2020-08-25 | 中国一冶集团有限公司 | Device for adjusting size of tunnel excavation trolley |
| CN112360498A (en) * | 2020-11-25 | 2021-02-12 | 国家电网有限公司 | Underground cavern moving operation platform and operation method thereof |
| CN113738393A (en) * | 2021-09-06 | 2021-12-03 | 中铁开发投资集团有限公司 | Construction device and method for shallow-buried drilling and blasting method of urban rail transit in downtown area |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108457666A (en) | A kind of liftable adjustable type tunnel multi-step excavates rack | |
| CN106089258B (en) | Tunnel device and construction method | |
| CN108103939B (en) | Combined reinforcement mode and construction process for construction of oblique-section steel trestle | |
| US20210355828A1 (en) | Method of treating tunnel collapse with roof-contacted shield support | |
| CN104947681B (en) | Super large super deep basement ground pit construction method | |
| CN102305091B (en) | Support structure for hard rock large-section tunnel construction, and construction method for support structure | |
| CN102400689B (en) | Convoluted excavation method for undermined tunnel with extra-large cross section | |
| CN208010356U (en) | A kind of liftable adjustable type tunnel multi-step excavates rack | |
| CN108625377A (en) | A kind of foundation pit diagonal brace pile construction method and its auxiliary tool | |
| CN210068174U (en) | Large deformation section supporting structure of carbon slate tunnel | |
| CN110985066A (en) | Tunnel grouting support method and structure | |
| CN112282805B (en) | Intelligent reinforcing trolley for mine method tunnel | |
| CN206860205U (en) | A kind of platform mechanical arm of bow member installation chassis | |
| CN108797323A (en) | A kind of steel trestle suitable for hardpan | |
| CN211340800U (en) | Super dark foundation ditch earthwork excavation platform structure | |
| CN212482296U (en) | Foundation ditch stone side blasting protector | |
| CN212054727U (en) | Pavilion type shield plate support | |
| CN210622821U (en) | Bias tunnel bow member and bias tunnel bow member top-raising structure | |
| CN106948836B (en) | Breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf | |
| CN106523011B (en) | A kind of simple light hydraulic support and use the holder Sub-Level Caving coal-mining method | |
| CN217761077U (en) | Tunnel gushes water and gushes mud step-down drainage with supplementary pilot hole and branch tunnel structure | |
| CN213358635U (en) | Inclined support type deep foundation pit supporting structure | |
| CN210049911U (en) | Adjustable arch frame suitable for large deformation of carbonaceous slate tunnel | |
| CN217760997U (en) | Combined split mounting type rack for tunnel three-step construction | |
| CN217758896U (en) | High-pressure jet grouting pile waterproof curtain structure reinforcing device for deep foundation pit construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |