CN212003199U - Soft rock large deformation tunnel lining supporting construction - Google Patents
Soft rock large deformation tunnel lining supporting construction Download PDFInfo
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- CN212003199U CN212003199U CN202020236313.8U CN202020236313U CN212003199U CN 212003199 U CN212003199 U CN 212003199U CN 202020236313 U CN202020236313 U CN 202020236313U CN 212003199 U CN212003199 U CN 212003199U
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Abstract
The utility model discloses a soft rock large deformation tunnel lining supporting structure, which comprises a tunnel system anchor rod, a primary supporting structure, a reserved deformation amount and a secondary lining structure which are sequentially arranged along the radial outside-in of a tunnel, wherein the tunnel system anchor rod is uniformly arranged into a plurality of anchor rods along the outer ring of the primary supporting structure of an arch body; for reserving the deflection between primary supporting construction and secondary lining structure, reserve the deflection and reserve and have the deformation space, the interval is provided with a plurality of buffering shock-absorbing structure in the deformation space, and buffering shock-absorbing structure is located between primary supporting construction and the secondary lining structure. Adopt the utility model discloses the structure can effectively realize soft rock large deformation tunnel advance support, coordinate to let and press and overall stable design purpose, simultaneously, the even atress of secondary lining, its compression deformation can effectively reduce the pressure of later stage action on secondary lining, ensures structure safety to form stable bearing arch, be favorable to in the tunnel, the construction safety of lower step.
Description
Technical Field
The utility model relates to a supporting construction, it is specific relate to a soft rock large deformation tunnel lining supporting construction, belong to tunnel construction engineering technical field.
Background
Generally speaking, with the continuous development and extension of highway construction in China, the number of long and deep tunnels under various geological environmental conditions is gradually increased. Particularly in the mountainous areas in southwest, more and more tunnel engineering is built near or across the earthquake fracture zone, the engineering conditions are severe, the fracture activity is frequent, the tunnel engineering belongs to areas with high intensity and high ground stress, and the problem of large deformation often occurs in surrounding rocks under the conditions of schists, phyllite, soft clay layers, strongly weathered tuff, mudstone, broken zones, mineralized metamorphic clay and the like. In recent years, the problem of large deformation disasters of tunnels in weak surrounding rock sections is increasingly prominent, mainly manifested as deformation invasion limit, spray layer falling and block falling, support cracking, steel frame distortion, arch foot instability, bottom plate bulging, even collapse or secondary lining cracking in local sections, which not only seriously affects construction safety and construction quality, but also adversely affects construction period and investment. At present, the construction of the soft rock large-deformation tunnel mainly depends on the technological measures of reinforcing and encrypting a primary support steel frame structure, increasing the reserved deformation, reinforcing a secondary lining structure and the like to overcome the engineering problem, but a good support effect is not achieved.
Therefore, the key point for solving the technical problems is to develop a soft rock large-deformation tunnel lining supporting structure which can effectively realize advanced supporting, coordinated yielding and strong overall stability.
Disclosure of Invention
To a great deal of defect and not enough that exist among the above-mentioned background art, for the deformation that overcomes the big tunnel construction of deformation of soft rock often takes place invade limit, steelframe distortion, hunch foot unstability scheduling problem, the utility model discloses improve and the innovation to this, aim at provides a simple structure, and novel in design is reasonable, can effectively realize advance support, coordinate to let press and overall stability's such a big tunnel lining supporting construction of deformation of soft rock.
The utility model discloses another invention aim at realize can be more reasonable share the surrounding rock pressure that the just structure transmitted and can realize that the best atress form resists outside weak surrounding rock deformation pressure simultaneously.
In order to solve the above problems and achieve the above objects, the present invention provides a soft rock large deformation tunnel lining support structure, which is realized by adopting the following design structure and the following technical scheme:
as the utility model relates to an improvement of a soft rock large deformation tunnel lining supporting structure, the tunnel system anchor rod comprises a tunnel system anchor rod (1), a primary supporting structure (2), a reserved deformation amount (3) and a secondary lining structure (4) which are sequentially arranged from outside to inside along the radial direction of a tunnel, wherein the number of the tunnel system anchor rod (1) is uniformly arranged in a ring shape along the outer side of the primary supporting structure (2) of an arch body; for reserving deflection (3) between primary supporting structure (2) and secondary lining structure (4), reserve deflection (3) and reserve the deformation space, the interval is provided with a plurality of buffering shock-absorbing structure (5) in the deformation space, and buffering shock-absorbing structure (5) are located between primary supporting structure (2) and secondary lining structure (4).
As the utility model discloses foretell improvement, tunnel system stock (1) is for making up cavity stock or the whole length bonds type mortar stock or makes up cavity stock and the whole length and bonds type mortar stock and thoughtlessly take the use each other.
As the utility model discloses foretell further improvement, the combination cavity stock sets up in the hunch portion in tunnel, the type mortar stock that bonds of full length sets up in the side wall and the inverted arch department in tunnel.
As the above further improvement of the present invention, the combined hollow anchor rod is a Φ 25 combined hollow anchor rod; the full-length bonding type mortar anchor rod is a phi 22 full-length bonding type mortar anchor rod or a full-thread steel bar, wherein the mortar strength is not lower than M20.
As the utility model discloses foretell further improvement again, the length of system stock (1) is 3 ~ 5m, arranges the interval and is 1 mx 1 m.
As a further improvement of the above, the primary support structure (2) comprises primary sprayed concrete, a profile steel frame and secondary sprayed concrete, wherein the profile steel frame is arranged in a circular full ring; the reserved deformation (3) is considered according to 30-105 cm, and is properly adjusted according to the actual situation of a site during construction.
As a still further improvement of the above of the present invention, the thickness of the primary sprayed concrete is 40mm, and the thickness of the secondary sprayed concrete is 30-35 mm; the section steel frame adopts hot rolling HW175 section steel or hot rolling I25b section steel, the longitudinal spacing of steelframe is 0.5 ~ 0.8m, the steelframe comprises a plurality of units, each unit is assembled in the prefabricated hole outside the hole, adjust unit length and joint position according to actual conditions during the construction.
As a still further improvement of the above structure of the present invention, the secondary lining structure (4) is made of C35 reinforced concrete, and the reinforced concrete structure is designed to have a variable cross-section and an oval shape; the structure thickness is 50 ~ 75cm, and gas tightness reinforced concrete is adopted in the gas defence district.
As the utility model discloses the foretell further improvement again, buffering shock-absorbing structure (5) are compound rubber spring, and this compound rubber spring outer end welds with primary frame, and inner is 20cm apart from secondary lining structure (4) surface.
As a still further improvement of the above structure of the present invention, the diameter of the composite rubber spring is 150-180 mm; three groups are symmetrically arranged on two sides of the line, the circumferential arrangement distance is 1-2 m, and the longitudinal arrangement distance is consistent with that of the primary support steel frame; and the outer surface of the composite rubber spring is sequentially sprayed with an injection molding layer and a polyurethane waterproof coating from inside to outside.
The working principle is as follows: the utility model relates to a soft rock large deformation tunnel generally adopts three step method construction, and main construction process includes:
(1) carrying out support construction of an advance system anchor rod (1), blasting and excavating tunnel face core soil in steps, and sequentially constructing primary support structures (2) on the peripheries of the steps: primarily spraying concrete, erecting a steel frame, drilling a radial anchor rod, laying a reinforcing mesh, spraying the concrete again to the designed thickness, and welding and fixing the outer end of the buffering and damping structure (5) and the primary support steel frame in the period;
(2) pouring an inverted arch and a side wall foundation, and pouring the inverted arch to fill to a designed height after the concrete of the inverted arch is initially set;
(3) pouring secondary lining concrete at one time by using a lining template trolley;
(4) and sequentially and circularly constructing the rest tunnel sections until the whole construction work is finished.
Compared with the prior art, the utility model produced beneficial effect is:
1. the utility model has simple structure, reasonable and novel structure, and the tunnel primary support section steel frame adopts circular full-ring arrangement, which can resist the deformation pressure of external weak surrounding rock in the best stress form; the secondary lining reinforced concrete structure adopts a variable cross-section oval design, so that the surrounding rock pressure transmitted by the primary support structure can be more reasonably shared; a deformation space is reserved between the primary support and the secondary lining, a damping spring is arranged in the middle at intervals and is welded with the primary support steel frame, and the damping spring is not in contact with the secondary lining structure under the normal stress condition; when the primary supporting structure deforms too much, the damping spring is extruded and then contacts with the secondary lining, and the primary supporting structure and the secondary lining structure are jointly resistant to pressure. By adopting the structure of the utility model, the design purposes of advanced support, coordinated yielding and integral stability of the soft rock large deformation tunnel can be effectively realized;
2. the utility model has the advantages that the buffering and damping structure is arranged between the primary supporting structure and the secondary lining structure, so that the secondary lining is uniformly stressed, meanwhile, the compression deformation of the secondary lining can effectively reduce the pressure acted on the secondary lining in the later period, and the structure safety is ensured, so that a stable bearing arch is formed, and the construction safety of the middle step and the lower step of the tunnel is facilitated;
3. the utility model has simple structure, reasonable design, simple construction, high construction efficiency and good use effect, and can effectively support the tunnel hole of the soft rock tunnel;
4. buffering shock-absorbing structure can be fine through letting press to warp and absorb partial energy, need not reserve the deflection, make the even atress of secondary lining structure avoid appearing stress concentration, protect the secondary lining structure to can prevent that the country rock from collapsing the damage to the tunnel, effectively improve the overall stability of country rock, make the tunnel country rock be difficult to appear collapsing and seep water, guarantee construction safety.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of the present invention.
Wherein, the reference numbers in the figures: the method comprises the following steps of 1-anchor rod of a tunnel system, 2-primary supporting structure, 3-reserved deformation, 4-secondary lining structure and 5-buffering damping structure.
Detailed Description
In order to make the technical means, the inventive features, the objectives and the functions of the present invention easy to understand, the technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description, and it should be noted that the embodiments and the features of the embodiments in the present application can be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The lining support structure for the soft rock large-deformation tunnel comprises a tunnel system anchor rod 1, a primary support structure 2, a reserved deformation amount 3 and a secondary lining structure 4 which are sequentially arranged from outside to inside along the radial direction of the tunnel, wherein the number of the tunnel system anchor rods 1 is uniformly arranged in an annular mode along the outer side of the primary support structure 2 of an arch body; for reserving deflection 3 between primary supporting structure 2 and secondary lining structure 4, reserve deflection 3 and reserve the deformation space, the interval is provided with a plurality of buffering shock-absorbing structure 5 in the deformation space, and buffering shock-absorbing structure 5 is located between primary supporting structure 2 and secondary lining structure 4.
Further, the anchor rod 1 of the tunnel system is a combined hollow anchor rod or a full-length bonding type mortar anchor rod or a combined hollow anchor rod and a full-length bonding type mortar anchor rod which are mutually mixed and overlapped for use.
Specifically, the combined hollow anchor rod is arranged at the arch part of the tunnel, and the full-length bonding type mortar anchor rod is arranged at the side wall and the inverted arch of the tunnel.
Specifically, the combined hollow anchor rod is a phi 25 combined hollow anchor rod; the full-length bonding type mortar anchor rod is a phi 22 full-length bonding type mortar anchor rod or a full-thread steel bar, wherein the mortar strength is not lower than M20.
Further, the length of the system anchor rod 1 is 3-5 m, and the arrangement distance is 1m multiplied by 1 m.
Further, the primary supporting structure 2 is composed of primary sprayed concrete, a profile steel frame and secondary sprayed concrete, wherein the profile steel frame is arranged in a circular full ring shape; the reserved deformation 3 is considered according to 30-105 cm, and is properly adjusted according to the actual situation of a site during construction.
Specifically, the thickness of the primary sprayed concrete is 40mm, and the thickness of the secondary sprayed concrete is 30-35 mm; the section steel frame adopts hot rolling HW175 section steel or hot rolling I25b section steel, the longitudinal spacing of steelframe is 0.5 ~ 0.8m, the steelframe comprises a plurality of units, each unit is assembled in the prefabricated hole outside the hole, adjust unit length and joint position according to actual conditions during the construction.
Further, the secondary lining structure 4 is made of C35 reinforced concrete, and the reinforced concrete structure is designed to be a variable cross-section oval; the structure thickness is 50 ~ 75cm, and gas tightness reinforced concrete is adopted in the gas defence district.
Further, buffering shock-absorbing structure 5 is compound rubber spring, and this compound rubber spring outer end and the primary steel frame welding, inner apart from 4 surface 20cm of secondary lining structures.
Specifically, the specification diameter of the composite rubber spring is 150-180 mm; three groups are symmetrically arranged on two sides of the line, the circumferential arrangement distance is 1-2 m, and the longitudinal arrangement distance is consistent with that of the primary support steel frame; and the outer surface of the composite rubber spring is sequentially sprayed with an injection molding layer and a polyurethane waterproof coating from inside to outside.
To sum up, the utility model discloses more specific embodiment is:
a soft rock large deformation tunnel lining supporting structure of the design structure needs to be manufactured and installed for standby before being used.
During manufacturing and installation, as shown in fig. 1, the soft rock large-deformation tunnel lining supporting structure mainly comprises a tunnel system anchor rod, a primary supporting structure, a reserved deformation amount, a secondary lining structure and a buffering and damping structure, wherein the buffering and damping structure is a damping spring, a tunnel primary supporting section steel frame is arranged in a circular full ring mode, the secondary lining reinforced concrete structure is designed in a variable cross section oval mode, a deformation space is reserved between the primary supporting structure and the secondary lining structure, the damping springs are arranged at intervals in the deformation space, and the design purposes of advanced supporting, coordinated yielding and overall stability can be effectively achieved. Wherein, the arch part of the anchor rod of the system adopts a phi 25 combined hollow anchor rod, the side wall and the inverted arch adopt phi 22 full-length bonding type mortar anchor rods (full-thread steel bars), and the mortar strength is not lower than M20; the length of the system anchor rod is 3-5 m, and the arrangement distance is 1m multiplied by 1m (annular multiplied by longitudinal); the primary support structure comprises primary sprayed concrete, a profile steel frame and secondary sprayed concrete, wherein the thickness of the primary sprayed concrete is 40mm, the thickness of the secondary sprayed concrete is 30-35 mm, the profile steel frame adopts hot-rolled HW175 profile steel or hot-rolled I25b profile steel, the longitudinal distance between the steel frames is 0.5-0.8 m, the steel frame comprises a plurality of units, each unit is assembled in a prefabricated hole outside the hole, and the length of the unit and the position of a joint are adjusted according to actual conditions during construction; considering the reserved deformation amount according to 30-105 cm, and properly adjusting the reserved deformation amount according to the actual situation on site during construction; the secondary lining structure is made of C35 reinforced concrete, the thickness of the structure is 50-75 cm, and the gas-tight reinforced concrete is adopted in a gas defense area; the damping spring is a composite rubber spring, and the specification diameter is 150-180 mm; the springs are arranged between the primary support and the secondary lining, 3 groups of springs are symmetrically arranged on two sides of the line respectively, the circumferential arrangement distance is 1-2 m, and the longitudinal arrangement distance is consistent with that of the primary support steel frame; the outer end of the spring is welded with the primary support steel frame, and the inner end of the spring is 20cm away from the surface of the secondary lining.
After accomplishing according to foretell processing installation, can use, during the use, the utility model relates to a soft rock large deformation tunnel generally adopts three step method construction, and main work progress includes following step:
(1) carrying out support construction of an anchor rod 1 of an advance system, blasting and excavating tunnel face core soil in steps, and sequentially constructing primary support structures 2 on the peripheries of the steps: primarily spraying concrete, erecting a steel frame, drilling a radial anchor rod, laying a reinforcing mesh, spraying the concrete again to the designed thickness, and welding and fixing the outer end of the buffering and damping structure 5 and a primary support steel frame in the period;
(2) pouring an inverted arch and a side wall foundation, and pouring the inverted arch to fill to a designed height after the concrete of the inverted arch is initially set;
(3) pouring secondary lining concrete at one time by using a lining template trolley;
(4) and sequentially and circularly constructing the rest tunnel sections until the whole construction work is finished.
Finally, it is to explain, it is right above that the utility model provides a soft rock large deformation tunnel lining supporting construction has carried out detailed introduction, and is right here the utility model discloses a principle has been described, and the explanation of above theory of operation is only used for helping understanding the utility model discloses a core thought. It should be noted that, for those skilled in the art, the present invention can be modified and modified without departing from the principle of the present invention, and the modified and modified embodiments also fall into the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a soft rock large deformation tunnel lining supporting construction which characterized in that: the tunnel system anchor rod structure comprises a tunnel system anchor rod (1), a primary supporting structure (2), a reserved deformation amount (3) and a secondary lining structure (4), wherein the number of the tunnel system anchor rods (1) is uniformly distributed in an annular mode along the outer side of the primary supporting structure (2) of an arch body; for reserving deflection (3) between primary supporting structure (2) and secondary lining structure (4), reserve deflection (3) and reserve the deformation space, the interval is provided with a plurality of buffering shock-absorbing structure (5) in the deformation space, and buffering shock-absorbing structure (5) are located between primary supporting structure (2) and secondary lining structure (4).
2. The soft rock large deformation tunnel lining supporting structure according to claim 1, characterized in that: the anchor rod (1) of the tunnel system is a combined hollow anchor rod or a full-length bonding type mortar anchor rod or the combined hollow anchor rod and the full-length bonding type mortar anchor rod are mutually mixed and overlapped for use.
3. The soft rock large deformation tunnel lining supporting structure according to claim 2, characterized in that: the combined hollow anchor rod is arranged at the arch part of the tunnel, and the full-length bonding type mortar anchor rod is arranged at the side wall and the inverted arch of the tunnel.
4. The soft rock large deformation tunnel lining supporting structure according to claim 3, characterized in that: the combined hollow anchor rod is a phi 25 combined hollow anchor rod; the full-length bonding type mortar anchor rod is a phi 22 full-length bonding type mortar anchor rod or a full-thread steel bar, wherein the mortar strength is not lower than M20.
5. The soft rock large deformation tunnel lining supporting structure according to claim 1, characterized in that: the system anchor rod (1) is 3-5 m in length and 1m multiplied by 1m in arrangement distance.
6. The soft rock large deformation tunnel lining supporting structure according to claim 1, characterized in that: the primary supporting structure (2) is composed of primary sprayed concrete, a profile steel frame and secondary sprayed concrete, wherein the profile steel frame is arranged in a circular full ring mode; the reserved deformation (3) is considered according to 30-105 cm, and is properly adjusted according to the actual situation of a site during construction.
7. The soft rock large deformation tunnel lining supporting structure according to claim 6, characterized in that: the thickness of the primary sprayed concrete is 40mm, and the thickness of the secondary sprayed concrete is 30-35 mm; the section steel frame adopts hot rolling HW175 section steel or hot rolling I25b section steel, the longitudinal spacing of steelframe is 0.5 ~ 0.8m, the steelframe comprises a plurality of units, each unit is assembled in the prefabricated hole outside the hole, adjust unit length and joint position according to actual conditions during the construction.
8. The soft rock large deformation tunnel lining supporting structure according to claim 1, characterized in that: the secondary lining structure (4) is made of C35 reinforced concrete, and the reinforced concrete structure is designed in a variable cross-section oval manner; the structure thickness is 50 ~ 75cm, and gas tightness reinforced concrete is adopted in the gas defence district.
9. The soft rock large deformation tunnel lining supporting structure according to claim 1, characterized in that: the buffering and damping structure (5) is a composite rubber spring, the outer end of the composite rubber spring is welded with the primary steel frame, and the distance between the inner end of the composite rubber spring and the outer surface of the secondary lining structure (4) is 20 cm.
10. The soft rock large deformation tunnel lining supporting structure according to claim 9, characterized in that: the specification diameter of the composite rubber spring is 150-180 mm; three groups are symmetrically arranged on two sides of the line, the circumferential arrangement distance is 1-2 m, and the longitudinal arrangement distance is consistent with that of the primary support steel frame; and the outer surface of the composite rubber spring is sequentially sprayed with an injection molding layer and a polyurethane waterproof coating from inside to outside.
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| CN202020236313.8U CN212003199U (en) | 2020-02-28 | 2020-02-28 | Soft rock large deformation tunnel lining supporting construction |
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| CN202020236313.8U CN212003199U (en) | 2020-02-28 | 2020-02-28 | Soft rock large deformation tunnel lining supporting construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060063A (en) * | 2021-11-01 | 2022-02-18 | 中铁十九局集团第二工程有限公司 | Double-layer steel frame concrete-sprayed primary support structure suitable for large deformation of tunnel and support method |
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2020
- 2020-02-28 CN CN202020236313.8U patent/CN212003199U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060063A (en) * | 2021-11-01 | 2022-02-18 | 中铁十九局集团第二工程有限公司 | Double-layer steel frame concrete-sprayed primary support structure suitable for large deformation of tunnel and support method |
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