CN205349352U - A first system suitable for large deformation tunnel - Google Patents
A first system suitable for large deformation tunnel Download PDFInfo
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- CN205349352U CN205349352U CN201620033312.7U CN201620033312U CN205349352U CN 205349352 U CN205349352 U CN 205349352U CN 201620033312 U CN201620033312 U CN 201620033312U CN 205349352 U CN205349352 U CN 205349352U
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Abstract
The utility model belongs to the technical field of highway tunnel, railway tunnel tunnel country rock are strutted and specifically relates to a first system suitable for large deformation tunnel, its characterized in that: on just propping up, has evenly seted up in the tunnel a plurality of mounting grooves, install force transfer device in the mounting groove respectively, force transfer device respectively with the tunnel just props up to connect and fixes, it passes the power component to be provided with at least one among the force transfer device, it produces deformation stress and passes through the force transfer device transmission extremely to pass the compressible deformation of power component the tunnel just props up. The utility model has the advantages that: the inside too big deformation stress who probably forms of lining cutting can dump in right amount, avoided current soft rock large deformation tunnel in ubiquitous just the distortion of lined steel frame, injection or concreting ftractures, peel off, invade dangerous accidents such as limit, the stability and the safety in assurance large deformation tunnel.
Description
Technical field
This utility model relates to vcehicular tunnel, railway tunnel tunnel surrounding supporting field, is especially adapted for use in first the system in large deformation tunnel.
Background technology
In buried railway in various weak broken rock stratum, vcehicular tunnel, large deformation phenomenon is relatively common, and for serious deformation, currently a popular control method is to close tunnel just Zhi Chenghuan early and strengthen a just lining cutting and resist pressure from surrounding rock, reduce tunnel deformation amount.But, this thinking produces little effect in actual applications, and large deformation tunnel a just steelframe distortion, injection or casting concrete cracking often occur, peels off, limit, tunnel cave etc. are seriously invaded in first lining cutting, initiation Important Project accident.So that adopt deep tunnel large deformation in suitable controlling measurement weak broken rock stratum.
Summary of the invention
The purpose of this utility model is according to above-mentioned the deficiencies in the prior art; provide first the system suitable in large deformation tunnel; deformation that can be bigger in self adaptation high-ground stress and soft rock tunnel; a degree of support force is provided in time to tunnel surrounding; allow again country rock that large range of deformation occurs simultaneously; effectively prop up at the beginning of protection tunnel, it is prevented that destruction, tunnel instability at the beginning of tunnel, reduce risk and the expense of tunnel excavation construction.
This utility model purpose realizes being completed by techniques below scheme:
A kind of first system suitable in large deformation tunnel, including at the beginning of tunnel, it is characterized in that: prop up at the beginning of described tunnel and uniformly offer some mounting grooves, it is separately installed with load transfer device in described mounting groove, described load transfer device is connected fixing respectively with at the beginning of described tunnel, being provided with at least one force transfer element in described load transfer device, the compressible deformation of described force transfer element is deformed stress and is transferred at the beginning of described tunnel to prop up by load transfer device.
Described load transfer device includes upper and lower part location-plate, it is provided with described force transfer element between the location-plate of described upper and lower part, described force transfer element at least includes movable panel and compression part, the top of described movable panel is connected fixing with described top location-plate, the bottom of described compression part is connected fixing with described bottom location-plate, and the bottom of described movable panel contacts at the top end surface of described compression part；The compressible deformation of force transfer element being made up of described movable panel and described compression part is deformed stress and is transferred at the beginning of described tunnel to prop up by described upper and lower part location-plate.
The both sides of described compression part are respectively arranged with limiting plate, and described limiting plate is fixedly connected on the location-plate of described bottom, and the compression space of described compression part is limited between described limiting plate；Be connected formation integrally by connector between described limiting plate.
Described load transfer device is provided with at least two force transfer element, between described force transfer elementIt is satisfied with:, whereinYield strength for described compression part；Sectional area for described compression part；Axial compressive strength at the beginning of described tunnel middle gunite concrete；Thickness at the beginning of described tunnel middle gunite concrete.
The utility model has the advantages that: for the large deformation destructive characteristics in tunnel in high-ground stress or soft rock, adopt a kind of support system and construction method that tunnel can be allowed to be deformed and country rock can provide support force in time, after rock mass in tunnel excavates, lay bar-mat reinforcement immediately, erect bow member, lay force transmission connections, then gunite concrete, supporting drag is formed in time at country rock free face, and when surrouding rock deformation increases over time, in this support system, the compression of load transfer device self can removal lined internal is likely to be formed in appropriate amount excessive deformational stress, avoid ubiquitous just lined steel frame distortion in current large-deformation tunnel in soft rock, injection or casting concrete cracking, peel off, invade the perils such as limit, ensure the stable of large deformation tunnel and safety.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the structural representation of this utility model load transfer device；
Fig. 3 be the force transfer element in this utility model load transfer device uncompressed deformation time structural representation；
Fig. 4 is the structural representation after the force transfer element compression in this utility model load transfer device.
Detailed description of the invention
This utility model feature and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, in order to the understanding of technical staff of the same trade:
As Figure 1-4, in figure, labelling 1-12 is expressed as: at the beginning of load transfer device 1, tunnel 2, country rock 3, top location-plate 4, movable panel 5, compression part 6, restraint zone 7, clamp nut 8, fastening bolt 9, limiting plate 10, bottom location-plate 11, handle 12.
Embodiment: as it is shown in figure 1, first the system being applicable to large deformation tunnel in the present embodiment includes propping up 2 at the beginning of load transfer device 1 and tunnel, prop up 2 inside being supported on country rock 3 at the beginning of tunnel.Uniformly offering mounting groove at the beginning of tunnel 2, load transfer device 1 is separately mounted in mounting groove.Load transfer device 1 is connected fixing with at the beginning of tunnel 2.Uniformly being opened at the beginning of tunnel the mounting groove on 2 for circular tunnel, it arranges position can be symmetrically arranged at centrage both sides, tunnel；And for horse-shoe tunnel, position is set should being arranged in the above spandrel place of spring line the position being axis of symmetry with structure centre line of mounting groove.
As shown in Figures 2 and 3, in the present embodiment, the main body of load transfer device 1 includes top location-plate 4, movable panel 5, compression part 6 and bottom location-plate 11, wherein movable panel 5 and compression part 6 are arranged between top location-plate 4 and bottom location-plate 11, the top of movable panel 5 is connected fixing with top location-plate 4, the bottom of compression part 6 is connected fixing with bottom location-plate 11, the bottom of movable panel 5 is inconsistent with the top of bottom location-plate 11, it is ensured that movable panel 5 can force in compression part 6 surface.Top location-plate 4 and bottom location-plate 11 are connected fixing with at the beginning of tunnel 2.The compressible deformation of force transfer element that movable panel 5 and compression part 6 are constituted is deformed stress and is transferred at the beginning of tunnel to prop up 2 by upper and lower part location-plate, thus providing a degree of support force to tunnel, make tunnel surrounding 3 keep three-dimensional stress state, tunnel Internal periphery can be allowed simultaneously to produce bigger convergent deformation.
Be fixedly installed two pieces of limiting plates 10 respectively in the both sides of compression part 6, between two pieces of limiting plates 10, and relative limit integral by restraint zone 7 colligation is fixed.One end of restraint zone 7 is by fastening screw thread 5 and the fastening that is connected of fastening bolt 9, it is ensured that the restraint zone 7 spacing fixing tightness to two pieces of limiting plates 10.Two pieces of limiting plates 10 are for being defined the compression scope of compression part 6, namely as it is shown on figure 3, by compression part 6 when compressive deformation, its overall width excursion is between two pieces of limiting plates 10.
The quantity of the force transfer element between top location-plate 4 and bottom location-plate 11 depends on tunnel convergence deflection and the compress variation of device self, can arrange several movable panel 5, compression body 6 and corresponding limiting plate 10 and force transfer element that securing member is constituted is to improve the drag of a system at the beginning of tunnel between top location-plate 4 and bottom location-plate 11.As shown in Figure 2 be the structure that three set movable plates 5, compression body 6 and corresponding limiting plate 10 and securing member thereof are set between top location-plate 4 and bottom location-plate 11, three covering devices can be evenly distributed between top location-plate 4 and bottom location-plate 11.
Spacing when being provided with at least two force transfer element in load transfer device 1, between force transfer elementIt is satisfied with:, whereinYield strength for compression part 6；Sectional area for compression part 6；For propping up the axial compressive strength of gunite concrete in 2 at the beginning of tunnel；For propping up the thickness of gunite concrete in 2 at the beginning of tunnel, to improve the drag of a just system, for guaranteeing that combination unit is surrendered prior to gunite concrete, it is to avoid gunite concrete crushes.Now, the yield limit of the load transfer device 1 gunite concrete yield limit lower than at the beginning of tunnel 2 in unit are, it is ensured that avoid gunite concrete to crush.
The present embodiment has following steps when Specific construction:
Prop up 2 at the beginning of construction tunnel, following two mode can be passed through simultaneously load transfer device 1 is installed at the beginning of tunnel 2:
(1-1) after tunnel excavation, lay the bar-mat reinforcement closing on rock side, and set system anchor bolt, put supporting steelframe (collapsible timbering should be adopted), at the fixing polyethylene foam sheet of design attitude, then gunite concrete, when concrete to be sprayed reaches design strength 70%, abolish cystosepiment surface gunite concrete, take out cystosepiment, load transfer device 1 is installed, and by firm to bar-mat reinforcement and the longitudinally connected reinforcement welding of at the beginning of the upper and lower part location-plate of load transfer device 1 and tunnel 2.
(1-2) after tunnel excavation, lay the bar-mat reinforcement closing on rock side, and set system anchor bolt, putting supporting steelframe (should adopt collapsible timbering), injection is a concrete just, when treating that it reaches design strength 70%, adopt mechanical implement at the design attitude grooving of load transfer device 1, and abolish the gunite concrete in grooving, load transfer device 1 is installed, and the upper and lower part location-plate of strong load transfer device 1 is firm with just a bar-mat reinforcement and longitudinally connected reinforcement welding.
The width of load transfer device 1 should be consistent with the thickness of at the beginning of tunnel 2, and length keeps consistent with the i-beam frame spacing of at the beginning of tunnel 2.In installation process, should ensure that and should contact fully between top fixing steel plate 4, bottom fixing steel plate 11 gunite concrete with at the beginning of tunnel 2, it is to avoid contact surface place stress is concentrated and destroyed first.The width of the mounting groove of load transfer device 1 is preferably 40-50cm.
The load transfer device 1 installation quantity at the beginning of tunnel 2 depends on tunnel convergence deflection 2And the compress variation x of device self, such as following formula:
In formula: n is that every lining papers builds load transfer device quantity, and x is the axial crushing deformation amount of each load transfer device 1,For the radial displacement increment of at the beginning of tunnel 2.
The present embodiment is in the specific implementation: as shown in figures 1 and 3, the surface of top location-plate 4 contacts with country rock 3, when tunnel deformation shrinks, country rock 9 makes generation relative displacement between the location-plate of upper and lower part to top location-plate 4 force, namely orders about top location-plate 4 lower portion location-plate 11 side displacement.Now, top location-plate 4 drives movable panel 5 lower portion location-plate 11 to move, so that the compression part 6 inconsistent with movable panel 5 bottom bends to its free face, produce deformational stress, this stress is transferred to a structure at the beginning of tunnel by top location-plate 4 and bottom location-plate 11, make just to prop up there is certain circumference stress in deformation process, a degree of support force is provided to tunnel, tunnel surrounding is made to keep three-dimensional stress state, it is beneficial to stablizing of tunnel surrounding, bigger convergent deformation can be allowed simultaneously.
Restraint zone 7, clamp nut 8 and fastening bolt 9, by the deformation space of restriction limiting plate 10, increase deformation resistance, make just to prop up the support force to country rock and incrementally increase to first Zhi Kangli limiting design value.Movable panel 5 must upwardly extend certain length from the limiting plate 10 of bottom, and this length is that each load transfer device allows deformation value, depends on that this load transfer device quantity is installed in tunnel clearance convergence design load and domain lining cutting, is typically between 10-25cm.Should in conjunction with field measurement and theory analysis before this load transfer device is installed, rational prediction tunnel deformation amount.
The yield strength of movable panel 5, restraint zone 7 and limiting plate 10 is both needed to the yield strength more than compression part 6, it is ensured that when compression part 6 compressive deformation, remaining part all-the-time stable.Electric arc can be adopted between movable panel 5 and the top location-plate 2 on its top to weld；Electric arc can also be adopted to weld between limiting plate 10, compression part 6 and the bottom location-plate 11 of its bottom.
When the width of top location-plate 4 and bottom location-plate 11 is bigger, for the ease of the force transmission connections in site operation librarian use the present embodiment, as shown in Figure 3, device can arrange handle 12, the two ends of handle 12 are connected middle part that is fixing and that be positioned at upper and lower part location-plate respectively with upper and lower part location-plate, make site operation personnel can pass through handle 12 and mention force transmission connections, it is simple to carry, use.
Top location-plate 4, movable panel 5, compression part 6, restraint zone 7, limiting plate 10 and bottom location-plate 11 all can use steel plate to be made.
Claims (4)
1. first the system being applicable to large deformation tunnel, including at the beginning of tunnel, it is characterized in that: prop up at the beginning of described tunnel and uniformly offer some mounting grooves, it is separately installed with load transfer device in described mounting groove, described load transfer device is connected fixing respectively with at the beginning of described tunnel, being provided with at least one force transfer element in described load transfer device, the compressible deformation of described force transfer element is deformed stress and is transferred at the beginning of described tunnel to prop up by load transfer device.
2. a kind of first system suitable in large deformation tunnel according to claim 1, it is characterized in that: described load transfer device includes upper and lower part location-plate, it is provided with described force transfer element between the location-plate of described upper and lower part, described force transfer element at least includes movable panel and compression part, the top of described movable panel is connected fixing with described top location-plate, the bottom of described compression part is connected fixing with described bottom location-plate, and the bottom of described movable panel contacts at the top end surface of described compression part；The compressible deformation of force transfer element being made up of described movable panel and described compression part is deformed stress and is transferred at the beginning of described tunnel to prop up by described upper and lower part location-plate.
3. a kind of first system suitable in large deformation tunnel according to claim 2, it is characterized in that: the both sides of described compression part are respectively arranged with limiting plate, described limiting plate is fixedly connected on the location-plate of described bottom, and the compression space of described compression part is limited between described limiting plate；Be connected formation integrally by connector between described limiting plate.
4. a kind of first system suitable in large deformation tunnel according to claim 2, it is characterised in that: described load transfer device is provided with at least two force transfer element, between described force transfer elementIt is satisfied with:, whereinYield strength for described compression part；Sectional area for described compression part；Axial compressive strength at the beginning of described tunnel middle gunite concrete；Thickness at the beginning of described tunnel middle gunite concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620033312.7U CN205349352U (en) | 2016-01-14 | 2016-01-14 | A first system suitable for large deformation tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620033312.7U CN205349352U (en) | 2016-01-14 | 2016-01-14 | A first system suitable for large deformation tunnel |
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| CN205349352U true CN205349352U (en) | 2016-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484759A (en) * | 2016-01-14 | 2016-04-13 | 上海市隧道工程轨道交通设计研究院 | Primary support system applicable to large-deformation tunnel and construction method thereof |
| CN109989777A (en) * | 2019-04-03 | 2019-07-09 | 中铁十八局集团有限公司 | The method for being squeezed and deformed Duan Chuzhi large deformation for controlling the small mileage in tunnel |
-
2016
- 2016-01-14 CN CN201620033312.7U patent/CN205349352U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484759A (en) * | 2016-01-14 | 2016-04-13 | 上海市隧道工程轨道交通设计研究院 | Primary support system applicable to large-deformation tunnel and construction method thereof |
| CN105484759B (en) * | 2016-01-14 | 2019-03-08 | 上海市隧道工程轨道交通设计研究院 | First branch system and its construction method suitable for large deformation tunnel |
| CN109989777A (en) * | 2019-04-03 | 2019-07-09 | 中铁十八局集团有限公司 | The method for being squeezed and deformed Duan Chuzhi large deformation for controlling the small mileage in tunnel |
| CN109989777B (en) * | 2019-04-03 | 2020-06-09 | 中铁十八局集团有限公司 | Method for controlling initial support large deformation of tunnel small-mileage extrusion deformation section |
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