CN113006834A - Tunnel steel arch support deformation adjusting device and adjusting method - Google Patents
Tunnel steel arch support deformation adjusting device and adjusting method Download PDFInfo
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- CN113006834A CN113006834A CN202110284312.XA CN202110284312A CN113006834A CN 113006834 A CN113006834 A CN 113006834A CN 202110284312 A CN202110284312 A CN 202110284312A CN 113006834 A CN113006834 A CN 113006834A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011435 rock Substances 0.000 claims abstract description 66
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 239000011120 plywood Substances 0.000 claims 2
- 238000012423 maintenance Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 11
- 238000004873 anchoring Methods 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
本发明公开一种隧道钢拱架支撑变形调节装置及调节方法，隧道钢拱架支撑变形调节装置包括多节段工字钢，多节段工字钢拼装成与隧道开挖轮廓相适应的拱支撑结构，相邻节段工字钢之间设置有用于调节相邻工字钢之间距离的伸缩机构，每节段工字钢上设置有用于与围岩空洞底接触的伸缩顶出机构；优点是具有调节围岩变形和围岩荷载调节均分担功能，以更好应对围岩形变，保障施工安全。
The invention discloses a support deformation adjustment device and an adjustment method for a tunnel steel arch frame. The support deformation adjustment device for a tunnel steel arch frame comprises a multi-segment I-beam, and the multi-segment I-beam is assembled into an arch adapted to the tunnel excavation contour. In the support structure, a telescopic mechanism for adjusting the distance between adjacent I-beams is arranged between adjacent segment I-beams, and a telescopic ejector mechanism for contacting the bottom of the surrounding rock cavity is arranged on each segment of the I-beam; The advantage is that it has the functions of adjusting the deformation of the surrounding rock and adjusting the load of the surrounding rock, so as to better cope with the deformation of the surrounding rock and ensure the safety of construction.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a device and a method for adjusting support deformation of a tunnel steel arch frame.
Background
In recent years, the construction of highways in China enters a rapid development period, the investment of provinces in mountains in inland is more and more, tunnels are more in mountainous areas, primary support in the tunnel construction process is more important, steel arches are more main support forms, and the steel arches have the following main functions: 1. supporting the surrounding rock before the sprayed concrete acts; 2. reinforcing the sprayed concrete; 3. as the supporting point of the advance support; 4. the concrete can play the role of primary support together with anchor rods and sprayed concrete. In conclusion, the tunnel steel arch frame not only has enough strength, but also meets the requirement of uniform deformation of the tunnel surrounding rock, so that the deformation uniformity influences the overall stress condition and stability of the tunnel surrounding rock; the surrounding rock deformation is not only related to the strength of the steel arch, but also related to the contact uniformity between the steel arch and the surrounding rocks, and when the contact between the steel arch and the surrounding rocks is not uniform, the condition of the surrounding rock deformation can be changed, so that the stress load concentrated part of the steel arch becomes a stress weak point, the steel arch deforms under the action of the surrounding rock pressure, and further the tunnel construction safety is endangered.
Generally softer, loose tunnel country rock, at the excavation in-process, deformation of great amplitude can appear in the tunnel inside, and traditional steel bow member bearing structure is fixed arch shape usually, can't accomplish to adapt to on the country rock inner wall that easily takes place deformation completely, and is more weak to the deformation control dynamics of country rock, and in the excavation in-process, too big country rock deformation very easily causes steel bow member bearing structure's distortion deformation moreover, and then produces serious influence to the construction quality and the safety in tunnel.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a tunnel steel arch support deformation adjusting device and a tunnel steel arch support deformation adjusting method, which have the functions of adjusting surrounding rock deformation and load adjustment and load sharing of the surrounding rock, so that the deformation of the surrounding rock can be better dealt with, and the construction safety is guaranteed.
One of the technical solutions adopted by the present invention to solve the above technical problems is: the utility model provides a tunnel steel bow member supports deformation adjusting device, includes multisection I-steel, multisection I-steel assemble into the arch bearing structure who suits with tunnel excavation profile, adjacent festival section the I-steel between be provided with the telescopic machanism who is used for adjusting distance between the adjacent I-steel, every section the I-steel on be provided with be used for with the surrounding rock cavity bottom contact flexible ejection mechanism.
A first frame is fixed at one end of each section of the I-shaped steel, a second frame is fixed at the other end of each section of the I-shaped steel, the first frame is sleeved in the second frame adjacent to the I-shaped steel, and the telescopic mechanism is connected between the first frame and the second frame adjacent to the I-shaped steel. In the structure, the first frame is sleeved on the second frame, so that the first frame can slide relative to the second frame, and under the action of the telescopic mechanism, the distance between two adjacent sections of I-shaped steel can be flexibly and slightly adjusted, and the deformation requirement of the tunnel surrounding rock can be better met.
The first frame consists of a first bottom plate and three first side plates fixed on the first bottom plate, the first bottom plate is fixed on the I-shaped steel, the three first side plates are respectively positioned on three side edges of the first bottom plate, and are connected in sequence, each first side plate is provided with at least one first limit groove, the second frame consists of a second bottom plate and three second side plates fixed on the second bottom plate, the second bottom plate is fixed on the I-shaped steel, three second side plates are respectively positioned on three side edges of the second bottom plate, and are connected in sequence, each second side plate is provided with at least one second limit groove corresponding to the first limit groove, and a limit pin capable of sliding is connected between the first limit groove and the corresponding second limit groove. In this structure, the spacer pin is located first spacing groove and second spacing inslot, can guarantee on the one hand like this that first frame and second frame are flexible difficult dislocation between the two, and both are difficult for the separation, and on the other hand plays the limiting displacement to first frame and second frame stroke between the two again, avoids appearing the too big condition of both intervals.
The telescopic mechanism comprises a first jack connected to the center of the second frame, and the movable end of the first jack acts on the first frame adjacent to the I-shaped steel. In this structure, adopt first jack to adjust adjacent I-steel telescopic distance to this contact country rock, the deformation of control country rock is even, and the regulation mode is simple, and also more steady in the aspect of the working property is connected in proper order because three first curb plates in addition for first frame has an opening, and three second curb plates connect in proper order, makes first frame also have an opening, and the later stage of being convenient for like this is demolishd first jack.
The telescopic mechanism further comprises four spiral anchoring parts connected in the second frame, the four spiral anchoring parts are located on the periphery of the first jack, and the movable ends of the spiral anchoring parts act on the first frames of the adjacent I-shaped steel. In this structure, spiral anchoring part is screw jack, its equipartition is around first jack, when first jack carries out the deformation adjustment, through arranging the displacement sensor in the different positions in the steel bow member outside, gather the deformation of country rock, when steel bow member outside country rock deformation reaches evenly, rethread spiral anchoring part's flexible, anchor two adjacent sections I-steel, then take out first jack, use for next regulation, spray anchor support concrete in to first frame and the second frame at last, in order to guarantee the even and safety of country rock deformation.
The telescopic ejection mechanism comprises a movable template, a fixed template, a second jack and a top plate, wherein the top plate is used for being in contact with the bottom of the surrounding rock cavity, the fixed template is fixed on the I-steel, the second jack is fixed on the fixed template, the movable template is fixed on the movable end of the second jack, and the top plate is connected with the movable template through a connecting assembly. In this structure, the fixed die plate is fixed on the I-steel, provides the mounted position for the second jack, because the position of second jack is fixed, when the second jack during operation, drives the movable mould board motion, and the movable mould board passes through coupling assembling and is connected with the roof, consequently at the in-process of movable mould board motion, the roof also moves thereupon to can carry out adaptability adjustment country rock according to the country rock condition of difference and warp, with the guarantee construction safety.
Coupling assembling include first splint and second splint, first splint hug closely the lateral wall of I-steel on, second splint hug closely another lateral wall of I-steel on, first splint with the second splint between be connected through many movable screw rods, many movable screw rod equipartition be in the both sides of I-steel, movable screw rod one end with the roof be connected, movable screw rod the other end with movable mould board be connected, movable screw rod on still the spiro union have first bolt, second bolt and third bolt, first bolt hug closely first splint on, the second bolt hug closely second splint on, the third bolt hug closely movable mould board on. In the structure, in the initial state, the first bolt and the second bolt are in a non-tight state, the first clamping plate and the second clamping plate are connected through the movable screw rod, so that the position of the first clamping plate and the position of the second clamping plate on the I-shaped steel can be adjusted, the movable screw rod is driven to move by driving the second jack after the adjustment is finished, the purpose of moving the top plate is achieved, the first bolt and the second bolt are screwed until the bottom of a contact cavity of the top plate and the surrounding rock is achieved, the position of the movable screw rod is kept still, the I-shaped steel is tightly attached to the first clamping plate and the second clamping plate, and the purpose of completely supporting the surrounding rock is achieved.
First splint with the second splint between still be connected with many and decide the screw rod, many decide the screw rod equipartition and be in the both sides of I-steel, the fixed die plate pass through the locking bolt to be fixed decide on the screw rod. In the structure, the movable template is connected with the fixed screw through the locking bolt, after the second jack drives the top plate to be hardened, the locking bolt is loosened, and the second jack is disassembled to be used by the next H-shaped steel.
The second technical scheme adopted by the invention for solving the technical problems is as follows: a method for adjusting the support deformation of a tunnel steel arch by adopting a device for adjusting the support deformation of the tunnel steel arch comprises the following steps:
s1: after tunnel excavation is finished, assembling multiple sections of I-shaped steel into an arch supporting structure which is adaptive to the tunnel excavation outline, and preliminarily controlling the deformation of surrounding rocks;
s2: controlling the second jack to stop working after the top plate is contacted with the bottom of the surrounding rock cavity;
s3: adjusting the first bolt and the second bolt, and fixing the movable screw rod with the first clamping plate and the second clamping plate;
s4: loosening the locking bolt, and dismantling the fixed screw rod, the fixed template and the second jack;
s5: synchronously adjusting a first jack, acquiring the deformation condition of the surrounding rock through displacement sensors arranged at different positions outside the arch supporting structure, and stopping the first jack when the deformation of the surrounding rock is uniform;
s6: adjusting the spiral anchoring piece to anchor the two adjacent sections of I-shaped steel;
s7: taking out the first jack, spraying anchor support concrete into the first frame and the second frame, and curing to the age so as to ensure the uniformity and safety of the deformation of the surrounding rock;
s8: and repeating S1-S7 until the top plates on all the segment I-shaped steels are contacted with the bottom of the surrounding rock cavity, and finishing the adjustment of the whole segment of tunnel, thereby being beneficial to forward excavation of the subsequent segment of tunnel.
Compared with the prior art, the invention has the advantages that:
1. through the arrangement of the telescopic mechanism, the steel arch frame can have a telescopic deformation adjusting function, the adjustment between the steel arch frame and the surrounding rock deformation is realized, and the surrounding rock deformation can be uniform and reasonable along the direction of the steel arch frame through the adjustment so as to ensure the safety requirement in tunnel construction;
2. through the setting of flexible ejection mechanism, can let the steel bow member finely tune the cavity bottom in the better support tunnel country rock excavation, play the even mesh of better regulation country rock deformation, make tunnel lining's atress more even reasonable, guarantee the safety of the tunnel lining among the operation process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view of two adjacent I-beams of the present invention;
FIG. 3 is a schematic perspective view of the exploded view of FIG. 2 according to the present invention;
FIG. 4 is a schematic perspective view of the I-steel of the present invention in cooperation with a telescopic ejection mechanism;
fig. 5 is a schematic perspective view of the present invention with the second jack removed from fig. 4.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited thereto.
The first embodiment is as follows: as shown in the figure, the tunnel steel arch support deformation adjusting device comprises multiple sections of I-shaped steel 1, wherein the multiple sections of I-shaped steel are assembled into an arch support structure matched with a tunnel excavation profile, a telescopic mechanism 2 used for adjusting the distance between the adjacent I-shaped steel 1 is arranged between the adjacent sections of I-shaped steel 1, and a telescopic ejection mechanism 3 used for contacting with the bottom of a surrounding rock cavity is arranged on each section of I-shaped steel 1.
A first frame 4 is fixed at one end of each section of I-steel 1, a second frame 5 is fixed at the other end of each section of I-steel 1, the first frame 4 is sleeved in the second frame 5 of the adjacent I-steel 1, and the telescopic mechanism 2 is connected between the first frame 4 and the second frame 5 of the adjacent I-steel 1. In this structure, first frame 4 cover is established in second frame 5, and first frame 4 can slide relative second frame 5 like this to under telescopic machanism 2's effect, make the interval between two adjacent sections I-steel 1 can nimble micro-adjustment, thereby better satisfy tunnel country rock deformation requirement.
The first frame 4 is composed of a first bottom plate 41 and three first side plates 42 fixed on the first bottom plate 41, the first bottom plate 41 is fixed on the i-beam 1, the three first side plates 42 are respectively located on three sides of the first bottom plate 41 and are sequentially connected, at least one first limiting groove 43 is formed in each first side plate, the second frame 5 is composed of a second bottom plate 51 and three second side plates 52 fixed on the second bottom plate 51, the second bottom plate 51 is fixed on the i-beam 1, the three second side plates 52 are respectively located on three sides of the second bottom plate 51 and are sequentially connected, at least one second limiting groove 53 corresponding to the first limiting groove 43 is formed in each second side plate 52, and a sliding limiting pin 6 is connected between the first limiting groove 43 and the second limiting groove 53. In this structure, spacer pin 6 is located first spacing groove 43 and second spacing groove 53, can guarantee the difficult dislocation of flexible between first frame 4 and the second frame 5 on the one hand like this, and both are difficult for separating, and on the other hand plays the limiting displacement to the stroke between first frame 4 and the second frame 5 again, avoids appearing the too big condition of both intervals.
A first reinforcing plate is further connected between the first base plate 41 and the I-steel 1, the first reinforcing plate is fixed with the I-steel in a welding mode, a second reinforcing plate is further connected between the second base plate 51 and the I-steel 1, and the second reinforcing plate is fixed with the I-steel in a welding mode.
The telescopic mechanism 2 comprises a first jack 21 connected to the center of the second frame 5, and the movable end of the first jack 21 acts on the first frame 4 of the adjacent I-shaped steel 1. In this structure, adopt first jack 21 to adjust adjacent I-steel 1 flexible contact country rock to the deformation of control country rock is even, and the regulation mode is simple, and also more steady in the aspect of the working property is because three first curb plates 42 connect gradually, makes first frame 4 have an opening in addition, and three second curb plates 52 connect gradually, makes first frame 4 also have an opening, and the later stage of being convenient for like this is demolishd first jack 21.
The telescopic mechanism 2 further comprises four spiral anchoring pieces 22 connected to the inner side of the second frame 5, the four spiral anchoring pieces 22 are located on the periphery of the first jack 21, and the movable ends of the spiral anchoring pieces 22 act on the first frames 4 of the adjacent I-shaped steel 1. In this structure, spiral anchor assembly 22 is screw jack, its equipartition is around first jack 21, when first jack 21 carried out the deformation regulation, through arranging the displacement sensor in the different positions in the steel bow member outside, gather the deformation of country rock, when steel bow member outside country rock deformation reaches evenly, rethread spiral anchor assembly 22 stretches out and draws back, anchor two adjacent I-steel 1, then take out first jack 21, use for next regulation, at last to spray anchor support concrete in first frame 4 and the second frame 5, with even and safety of guaranteeing the country rock deformation.
The telescopic ejection mechanism 3 comprises a movable template 31, a fixed template 32, a second jack 33 and a top plate 34 used for being in contact with surrounding rocks, the fixed template 32 is fixed on the I-steel 1, the second jack 33 is fixed on the fixed template 32, the movable template 31 is fixed on the movable end of the second jack 33, and the top plate 34 is connected with the movable template 31 through a connecting assembly 7. In the structure, the fixed template 32 is fixed on the I-steel 1, and an installation position is provided for the second jack 33, and the position of the second jack 33 is fixed, so that when the second jack 33 works, the movable template 31 is driven to move, and the movable template 31 is connected with the top plate 34 through the connecting component 7, so that the top plate 34 also moves along with the movable template 31 in the moving process, and the adaptability adjustment can be performed according to different surrounding rock conditions, so that the construction safety is guaranteed.
The connecting assembly 7 comprises a first clamping plate 71 and a second clamping plate 72, wherein the first clamping plate 71 is tightly attached to the side wall of the I-steel 1, the second clamping plate 72 is tightly attached to the other side wall of the I-steel 1, the first clamping plate 71 and the second clamping plate 72 are connected through a plurality of movable screw rods 73, the movable screw rods 73 are uniformly distributed on two sides of the I-steel 1, one end of each movable screw rod 73 is connected with the top plate 34, the other end of each movable screw rod 73 is connected with the movable template 31, a first bolt 74, a second bolt 75 and a third bolt 76 are further screwed on each movable screw rod 73, the first bolt 74 is tightly attached to the first clamping plate 71, the second bolt 75 is tightly attached to the second clamping plate 72, and the third bolt 76 is tightly attached to the movable template 31. In the structure, in an initial state, the first bolt 74 and the second bolt 75 are in a non-tight state, the first clamping plate 71 and the second clamping plate 72 are connected through the movable screw 73, so that the positions of the first clamping plate 71 and the second clamping plate 72 on the I-shaped steel 1 can be adjusted, after the adjustment is finished, the movable screw 73 is driven to move by driving the second jack 33, the purpose of moving the top plate 34 is achieved, the top plate 34 is contacted with the bottom of the cavity of the surrounding rock, the first bolt 74 and the second bolt 75 are screwed, the position of the movable screw 73 is kept still, the position of the top plate 34 is fixed, and the first clamping plate 71 and the second clamping plate 72 tightly cling to the I-shaped steel 1, so that the purpose of completely supporting the surrounding rock is achieved.
A plurality of fixed screws 77 are further connected between the first clamping plate 71 and the second clamping plate 72, the plurality of fixed screws 77 are uniformly distributed on two sides of the I-beam 1, and the fixed die plate 32 is fixed on the fixed screws 77 through locking bolts 78. In this structure, the movable die plate 31 is connected to the fixed screw 77 by the locking bolt 78, and after the second jack 33 finishes driving the top plate 34, the locking bolt 78 is loosened to detach the second jack 33 for the next h-beam 1.
Example two: as shown in the figure, a method for adjusting the support deformation of a steel arch of a tunnel by using a device for adjusting the support deformation of a steel arch of a tunnel according to the first embodiment includes the following steps:
s1: after tunnel excavation is finished, assembling multiple sections of I-shaped steel into an arch supporting structure which is adaptive to the tunnel excavation outline, and preliminarily controlling the deformation of surrounding rocks;
s2: controlling the second jack to stop working after the top plate is contacted with the surrounding rock cavity;
s3: adjusting the first bolt and the second bolt, and fixing the movable screw rod with the first clamping plate and the second clamping plate;
s4: loosening the locking bolt, and dismantling the fixed screw rod, the fixed template and the second jack;
s5: synchronously adjusting a first jack, acquiring the deformation condition of the surrounding rock through displacement sensors arranged at different positions outside the arch supporting structure, and stopping the first jack when the deformation of the surrounding rock is uniform;
s6: adjusting the spiral anchoring piece to anchor the two adjacent sections of I-shaped steel;
s7: taking out the first jack, spraying anchor support concrete into the first frame and the second frame, and curing to the age so as to ensure the uniformity and safety of the deformation of the surrounding rock;
s8: and repeating S1-S7 until the top plates on all the segment I-shaped steels are contacted with the bottom of the surrounding rock cavity, and finishing the adjustment of the whole segment of tunnel, thereby being beneficial to forward excavation of the subsequent segment of tunnel.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, and the present invention may be modified in materials and structures, or replaced with technical equivalents, in the constructions of the above-mentioned various components. Therefore, structural equivalents made by using the description and drawings of the present invention or by directly or indirectly applying to other related arts are also encompassed within the scope of the present invention.
Claims (9)
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| CN202110284312.XA CN113006834B (en) | 2021-03-17 | 2021-03-17 | Tunnel steel arch support deformation adjusting device and adjusting method |
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| CN202110284312.XA CN113006834B (en) | 2021-03-17 | 2021-03-17 | Tunnel steel arch support deformation adjusting device and adjusting method |
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| CN113389576A (en) * | 2021-06-30 | 2021-09-14 | 中南大学 | Let and press supporting construction |
| CN114320380A (en) * | 2021-11-30 | 2022-04-12 | 云南省建筑科学研究院有限公司 | Adjustable connecting device for tunnel supporting frame and construction method thereof |
| CN114542123A (en) * | 2022-03-09 | 2022-05-27 | 中铁五局集团第五工程有限责任公司 | Stress-adaptive tunnel primary support steel support structure and construction method thereof |
| CN116398182A (en) * | 2023-05-05 | 2023-07-07 | 宁波朗达工程科技有限公司 | Load self-adaptive steel arch and tunnel construction method |
| IT202200001559A1 (en) * | 2022-01-31 | 2023-07-31 | Officine Maccaferri Italia S R L | Support rib for an excavation, with control of the thrust exerted by the walls of the excavation |
| WO2024108805A1 (en) * | 2022-11-21 | 2024-05-30 | 浙大城市学院 | Extensible-retractable device and annularly extensible-retractable tunnel steel arch |
| US12078065B2 (en) * | 2022-11-21 | 2024-09-03 | Zhejiang University City College | Telescopic device and telescopic annular tunnel steel arch |
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| CN113389576A (en) * | 2021-06-30 | 2021-09-14 | 中南大学 | Let and press supporting construction |
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| WO2024108805A1 (en) * | 2022-11-21 | 2024-05-30 | 浙大城市学院 | Extensible-retractable device and annularly extensible-retractable tunnel steel arch |
| US12078065B2 (en) * | 2022-11-21 | 2024-09-03 | Zhejiang University City College | Telescopic device and telescopic annular tunnel steel arch |
| CN116398182A (en) * | 2023-05-05 | 2023-07-07 | 宁波朗达工程科技有限公司 | Load self-adaptive steel arch and tunnel construction method |
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| CN113006834B (en) | 2023-02-07 |
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Effective date of registration: 20230914 Address after: 315016 Zhejiang Province, Ningbo city Haishu District cypress Road No. 89 Patentee after: Haican (Ningbo) Engineering Technology Co.,Ltd. Address before: 316022 No. 1, Haida South Road, Lincheng street, Dinghai District, Zhoushan, Zhejiang Patentee before: Zhejiang Ocean University |