CN113818407A - Multi-curved-edge prefabricated lining hydraulic tunnel adapting to poor surrounding rock conditions - Google Patents
Multi-curved-edge prefabricated lining hydraulic tunnel adapting to poor surrounding rock conditions Download PDFInfo
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- CN113818407A CN113818407A CN202111162718.7A CN202111162718A CN113818407A CN 113818407 A CN113818407 A CN 113818407A CN 202111162718 A CN202111162718 A CN 202111162718A CN 113818407 A CN113818407 A CN 113818407A
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- 239000011435 rock Substances 0.000 title claims abstract description 33
- 208000003580 polydactyly Diseases 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000007547 defect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a multi-curved-edge prefabricated lining hydraulic tunnel suitable for poor surrounding rock conditions, wherein the section of the hydraulic tunnel is a multi-curved-edge section which is formed by tangentially connecting ten arcs, two sides of the multi-curved-edge section are symmetrically arranged along a vertical central line (11), and a lining is arranged on the wall of the hydraulic tunnel. Compared with the traditional method, the method has the advantages of good stress condition, good hydraulic condition, high construction speed, easily controlled structure size and investment saving.
Description
Technical Field
The invention relates to the field of pressureless water delivery tunnel engineering in hydraulic and hydroelectric engineering, in particular to a multi-curved-edge prefabricated assembly type lining hydraulic tunnel suitable for poor surrounding rock conditions.
Background
The water delivery tunnel is a common building in hydraulic and hydroelectric engineering, and the selection of the form of the section of the tunnel is directly related to the support strength of surrounding rocks, the thickness of a lining structure, the construction difficulty, the operation and construction safety and the engineering investment. The commonly used cross-sectional forms include circular, portal, horseshoe and egg-shaped. When the surrounding rock conditions are poor, the egg-shaped tunnel has better structural stress conditions and hydraulic conditions, and at present, four-arc-shaped, five-arc-shaped and six-arc-shaped egg-shaped tunnels exist, wherein the stress and hydraulic conditions of the four-arc-shaped tunnel are better, but the curvature of a bottom plate is large, the traveling is difficult, the construction difficulty is large, stress concentration areas exist at the joints of bottom plates and side walls of the five-arc-shaped and six-arc-shaped egg-shaped tunnels, the stress conditions are slightly poor, and the tunnel is similar to a horseshoe-shaped section tunnel. The construction speed of tunnel lining has a great influence on the progress and safety of the project, the lining in the tunnel is usually formed in a cast-in-place mode at present, the lining construction has great timeliness and requires quick construction for poor surrounding rock conditions, and the cast-in-place lining construction of the multi-curved-edge egg-shaped tunnel is difficult and slow in progress. Therefore, aiming at the poor surrounding rock conditions, how to design a hydraulic tunnel with good stress conditions, excellent hydraulic performance, high construction speed and easily controlled structure size is a technical problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multi-curved-edge prefabricated lining hydraulic tunnel which is suitable for poor surrounding rock conditions. Compared with the traditional method, the method has the advantages of good stress condition, good hydraulic condition, high construction speed, reduction of construction difficulty, easy control of structure size and investment saving.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a prefabricated assembled lining cutting hydraulic tunnel of polydactyly of relatively poor country rock condition of adaptation which characterized in that: the section of hydraulic tunnel is the polydactyly section, and the polydactyly section comprises ten sections circular arcs tangent connections, and vertical central line symmetrical arrangement is followed to polydactyly section both sides sideline, and hydraulic tunnel hole wall sets up the lining cutting.
Further: the ten sections of circular arcs forming the cross section of the multi-curved-edge are respectively a crown circular arc section, a bottom plate circular arc section, a first section of circular arc section at the upper parts of two sections of side walls, a second section of circular arc section at the upper parts of two sections of side walls, a first section of circular arc section at the lower parts of two sections of side walls and a second section of circular arc section at the lower parts of two sections of side walls.
Further: the central angles of all sections of circular arcs forming the multi-curved-edge section are fixed, and the central angles of the top arch circular arc section, the first section of circular arc section at the upper part of the side wall, the second section of circular arc section at the upper part of the side wall, the first section of circular arc section at the lower part of the side wall, the second section of circular arc section at the lower part of the side wall and the circular arc section of the bottom plate are respectively 90 degrees, 30 degrees, 15 degrees, 60 degrees and 30 degrees.
Further: the radius proportional relation among all sections of circular arcs forming the multi-curved-edge section is fixed, the radiuses of the top arch circular arc section and the bottom plate circular arc section are respectively r and 3.88r, the radius of the first section of circular arc section at the upper part of the side wall is 3r, the radius of the second section of circular arc section at the upper part of the side wall is 4r, the radius of the first section of circular arc section at the lower part of the side wall is 2.5r, and the radius of the second section of circular arc section at the lower part of the side wall is 0.75 r; where r is a variable parameter.
Further: the prefabricated lining segment is divided into a top piece, a bottom piece, shoulder pieces and foot pieces, wherein the size of the top piece corresponds to the size of the top arch arc section, the size of the bottom piece corresponds to the size of the bottom plate arc section, the size of the shoulder pieces corresponds to the size of the first section of arc section at the upper part of the side wall and the second section of arc section at the upper part of the side wall, and the size of the foot pieces corresponds to the size of the first section of arc section at the lower part of the side wall and the second section of arc section at the lower part of the side wall.
Further: the hydraulic tunnel has the section height of 4r and the maximum width of 3.24 r.
Further: the hydraulic tunnel wall is formed by assembling prefabricated lining segments, a backfill grouting hole is reserved on each prefabricated lining segment, and the backfill grouting hole is also used as a system drainage hole.
Further: and a pea gravel layer is arranged between the prefabricated lining segment and the rock mass, and backfilling grouting is performed through a backfilling grouting hole.
Further: the drain hole of the system extends into the rock mass and has the depth dimension larger than 30 cm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the cross section of the hydraulic tunnel is of a multi-curved-edge structure, the tunnel wall lining is formed by tangency of different arcs, when one section of lining bears the action of external pressure, the pressure can be transmitted to the adjacent arc linings at two ends along the arc tunnel wall, so that the pressure is dispersed, the lining structure is stressed more uniformly, stress concentration cannot be formed, the structure is good in stress condition, and the lining thickness can be reduced on the premise of ensuring the stability and safety of the tunnel structure, so that the investment is saved.
The lining of the multi-curved-edge hydraulic tunnel structure adopts a factory prefabrication and field assembly mode, can obviously accelerate the field lining construction speed, greatly reduce the surrounding rock exposure time, and greatly improve the construction safety, reduce the supporting strength, save the investment and accelerate the engineering progress when the surrounding rock condition of the tunnel is poor. In addition, the difficult problems of high difficulty and slow progress of casting the multi-curved-edge tunnel lining in situ can be overcome.
Drawings
FIG. 1 is a layout diagram of the dimensions of the arc structures of the segments of the present invention;
FIG. 2 is a schematic view of the hydraulic tunnel lining arrangement of the present invention.
Reference numerals: 1-a crown arch arc segment; 2-a first arc section at the upper part of the side wall; 3-a second arc section at the upper part of the side wall; 4-a first arc section at the lower part of the side wall; 5-a second arc section at the lower part of the side wall; 6-arc section of bottom plate; 7-a topsheet; 8-shoulder tablets; 9-foot slices; 10-a negative film; 11-vertical midline; 13-a pea gravel layer; 14-backfill grouting holes.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with the specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
As shown in fig. 1 to 2, the multi-curved-edge prefabricated lining hydraulic tunnel suitable for poor surrounding rock conditions is characterized in that the section of the hydraulic tunnel is a multi-curved-edge section which is formed by tangentially connecting ten circular arcs, two sides of the multi-curved-edge section are symmetrically arranged along a vertical central line 11, and a lining is arranged on the wall of the hydraulic tunnel; the lining is prefabricated in a factory and then is transported to a site for assembly, rubber seals are arranged among lining segments and are connected through bolts; when the tunnel diameter is larger, the prefabricated lining can be divided into one block by each arc, so that the weight of a single block is reduced, and lining assembly is facilitated. The invention adopts the fabricated lining, and the construction speed is faster.
The hydraulic tunnel wall is formed by assembling prefabricated lining segments, the thickness and the reinforcing bars of the prefabricated lining segments are determined according to surrounding rock stability calculation and structural calculation, a backfill grouting hole 14 is reserved in each prefabricated lining segment, and the backfill grouting hole 14 is also used as a system drainage hole. The backfill grouting holes 14 are pre-buried in the prefabricated lining pipe, and different from the situation that the cast-in-place lining is only arranged on the top arch for backfill grouting, grouting and water drainage are arranged along the section system of the tunnel according to the scheme of the invention.
The design of the tunnel structure of the invention firstly determines the size of the tunnel structure according to the flow rate, and as long as one parameter is determined, other structure sizes are relatively fixed, generally, the height or width of the tunnel is determined firstly, and then the arc radius of each section of the tunnel is determined according to a fixed proportional relation.
The ten sections of circular arcs forming the cross section of the multi-curved-edge are respectively a top arch circular arc section 1, a bottom plate circular arc section 6, a first section of circular arc section 2 at the upper parts of two sections of side walls, a second section of circular arc section 3 at the upper parts of two sections of side walls, a first section of circular arc section 4 at the lower parts of two sections of side walls and a second section of circular arc section 5 at the lower parts of two sections of side walls.
The central angles of all sections of circular arcs forming the multi-curved-edge section are fixed, and the central angles of the top arch circular arc section 1, the first section of circular arc section 2 at the upper part of the side wall, the second section of circular arc section 3 at the upper part of the side wall, the first section of circular arc section 4 at the lower part of the side wall, the second section of circular arc section 5 at the lower part of the side wall and the circular arc section 6 of the bottom plate are respectively 90 degrees, 30 degrees, 15 degrees, 60 degrees and 30 degrees.
The radius proportion relation among all sections of circular arcs forming the multi-curved-edge section is fixed, the radiuses of the top arch circular arc section 1 and the bottom plate circular arc section 6 are r and 3.88r respectively, the radius of the first section of circular arc section 2 at the upper part of the side wall is 3r, the radius of the second section of circular arc section 3 at the upper part of the side wall is 4r, the radius of the first section of circular arc section 4 at the lower part of the side wall is 2.5r, and the radius of the second section of circular arc section 5 at the lower part of the side wall is 0.75 r; where r is a variable parameter. The bottom plate circular arc section 6 of the invention has smaller curvature, overcomes the defects of large curvature and difficult driving of the bottom plate of the traditional circular and four-circular-arc egg-shaped tunnels, leads the construction to be more convenient, simultaneously overcomes the problem of stress concentration of bottom angles of the five-circular-arc and six-circular-arc egg-shaped tunnels, and has better stress conditions. Because the ratio of the radius of each section of circular arc, the height of the tunnel and the width of the tunnel is fixed, and the central angle of each section of circular arc is fixed, the structure size is easy to control.
The prefabricated lining segment is divided into a top plate 7, a bottom plate 10, shoulder pieces 8 and foot pieces 9, wherein the size of the top plate 7 corresponds to that of the top arch arc section 1, the size of the bottom plate 10 corresponds to that of the bottom plate arc section 6, the size of the shoulder pieces 8 corresponds to that of the second section arc section 3 at the upper part of the first section arc section 2 of the side wall and the upper part of the side wall, and the size of the foot pieces 9 corresponds to that of the second section arc section 5 at the lower part of the first section arc section 4 of the side wall and the lower part of the side wall. The division of the prefabricated lining segments of the tunnel is not limited to the mode provided by the invention, and when the structural size of the tunnel is larger, the prefabricated lining segments of the tunnel can be divided into more segments, so that the prefabricated lining segments of the tunnel are convenient to assemble in the tunnel according to the principle and are determined according to the specific construction capacity. The prefabricated lining segment is prefabricated in a factory firstly, then is transported to a construction site, and is mechanically and automatically installed through the split prefabricated lining system, so that the assembling time can be greatly shortened, and the method is not limited to the assembling method.
The height H of the cross section of the hydraulic tunnel is 4r, and the maximum width B of the hydraulic tunnel is 3.24 r.
A pea gravel layer 13 is arranged between the prefabricated lining segment and the rock mass, namely, after the lining is assembled, pea gravel is backfilled in time to prevent the tunnel structure from deforming, and the backfill grouting is carried out through backfill grouting holes 14.
And after the backfilling grouting is finished for 14 days, carrying out secondary hole sweeping along the backfilling grouting hole 14 to form a system drainage hole, wherein the system drainage hole extends into the rock mass and has a depth size of more than 30 cm. The invention reserves the backfill grouting hole 14 on the prefabricated lining segment and also serves as a system drain hole, thereby not only meeting the grouting requirement, but also keeping the internal and external water pressure balance of the tunnel lining in the operation period and draining the external water in the maintenance period, thereby eliminating the internal and external unbalanced water pressure of the tunnel, ensuring that the tunnel structure has smaller stress and higher safety.
The invention is mainly suitable for but not limited to the water delivery tunnel with poor geological conditions and open flow in the tunnel. The method is also suitable for the pressure tunnel with poor surrounding rock conditions. For the conditions of surrounding rocks which are poor and similar to the conditions of a soil tunnel, a reverse filter layer is arranged on the rock entering side of a drain hole of the system, so that the occurrence of soil flowing is prevented, and the long-term operation stability of the tunnel is influenced.
According to the multi-curved-edge hydraulic tunnel structure, when the flow state in the tunnel is open flow, the net height is higher under the condition of a certain clearance, the requirement on the minimum net height is easily met, and the hydraulic condition is better. The multi-curved-edge hydraulic tunnel structure is a fixed structure, the radius of each section of arc, the height of the tunnel and the width of the tunnel are fixed in proportion, the central angle of each section of arc is fixed, and the structural size is easy to control.
According to the description and the drawings of the invention, the person skilled in the art can easily manufacture or use the multi-curved-edge prefabricated assembly type lining hydraulic tunnel adapting to poor surrounding rock conditions, and can generate the positive effects recorded by the invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides a prefabricated assembled lining cutting hydraulic tunnel of polydactyly of relatively poor country rock condition of adaptation which characterized in that: the section of hydraulic tunnel is the polydactyly section, and the polydactyly section comprises ten sections tangent connections of circular arc, and vertical central line (11) symmetrical arrangement are followed to polydactyly section both sides sideline, and hydraulic tunnel hole wall sets up the lining cutting.
2. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 1, wherein: the ten sections of circular arcs forming the cross section of the multi-curved-edge are respectively a top arch circular arc section (1), a bottom plate circular arc section (6), a first section of circular arc section (2) at the upper parts of the two sections of side walls, a second section of circular arc section (3) at the upper parts of the two sections of side walls, a first section of circular arc section (4) at the lower parts of the two sections of side walls and a second section of circular arc section (5) at the lower parts of the two sections of side walls.
3. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 2, wherein: the central angles of all sections of circular arcs forming the multi-curved-edge section are fixed, and the central angles of the top arch circular arc section (1), the first section of circular arc section (2) at the upper part of the side wall, the second section of circular arc section (3) at the upper part of the side wall, the first section of circular arc section (4) at the lower part of the side wall, the second section of circular arc section (5) at the lower part of the side wall and the circular arc section (6) of the bottom plate are respectively 90 degrees, 30 degrees, 15 degrees, 60 degrees and 30 degrees.
4. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 2, wherein: the radius proportional relation among all sections of circular arcs forming the multi-curved-edge section is fixed, the radiuses of the top arch circular arc section (1) and the bottom plate circular arc section (6) are r and 3.88r respectively, the radius of the first section of circular arc section (2) at the upper part of the side wall is 3r, the radius of the second section of circular arc section (3) at the upper part of the side wall is 4r, the radius of the first section of circular arc section (4) at the lower part of the side wall is 2.5r, and the radius of the second section of circular arc section (5) at the lower part of the side wall is 0.75 r; where r is a variable parameter.
5. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 2, wherein: the prefabricated lining segment is divided into a top plate (7), a bottom plate (10), shoulder pieces (8) and foot pieces (9), the size of the top plate (7) corresponds to the size of the top arch arc section (1), the size of the bottom plate (10) corresponds to the size of the bottom plate arc section (6), the size of the shoulder pieces (8) corresponds to the size of the first section arc section (2) on the upper part of the side wall and the second section arc section (3) on the upper part of the side wall, and the size of the foot pieces (9) corresponds to the size of the first section arc section (4) on the lower part of the side wall and the second section arc section (5) on the lower part of the side wall.
6. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 1, wherein: the hydraulic tunnel has the section height of 4r and the maximum width of 3.24 r.
7. The prefabricated assembled lining hydraulic tunnel of many curvilinears that adapts to poor country rock condition of claim 1, wherein: the hydraulic tunnel wall is formed by assembling prefabricated lining segments, a backfill grouting hole (14) is reserved in each prefabricated lining segment, and the backfill grouting hole (14) is also used as a system drainage hole.
8. The prefabricated assembled lining hydraulic tunnel of a kind of adapting to poor country rock condition of claim 7 of many curbs, characterized by: and a pea gravel layer (13) is arranged between the prefabricated lining segment and the rock mass, and backfilling grouting is performed through a backfilling grouting hole (14).
9. The prefabricated assembled lining hydraulic tunnel of a kind of adapting to poor country rock condition of claim 7 of many curbs, characterized by: the drain hole of the system extends into the rock mass and has the depth dimension larger than 30 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162718.7A CN113818407A (en) | 2021-09-30 | 2021-09-30 | Multi-curved-edge prefabricated lining hydraulic tunnel adapting to poor surrounding rock conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162718.7A CN113818407A (en) | 2021-09-30 | 2021-09-30 | Multi-curved-edge prefabricated lining hydraulic tunnel adapting to poor surrounding rock conditions |
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| CN113818407A true CN113818407A (en) | 2021-12-21 |
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| CN202111162718.7A Pending CN113818407A (en) | 2021-09-30 | 2021-09-30 | Multi-curved-edge prefabricated lining hydraulic tunnel adapting to poor surrounding rock conditions |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202544925U (en) * | 2012-04-13 | 2012-11-21 | 中国水电顾问集团华东勘测设计研究院 | One-hole dual-purpose tunnel drain hole structure |
| CN107780949A (en) * | 2017-10-13 | 2018-03-09 | 北京工业大学 | A kind of steel FRP complex waves card tunnel support method |
| CN110685255A (en) * | 2019-11-09 | 2020-01-14 | 黄河勘测规划设计研究院有限公司 | Assembled reinforced concrete segment suitable for quick lining of horseshoe tunnel |
| WO2020024268A1 (en) * | 2018-08-01 | 2020-02-06 | 中铁第一勘察设计院集团有限公司 | Tunnel precast lining assembly structure and method therefor |
-
2021
- 2021-09-30 CN CN202111162718.7A patent/CN113818407A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202544925U (en) * | 2012-04-13 | 2012-11-21 | 中国水电顾问集团华东勘测设计研究院 | One-hole dual-purpose tunnel drain hole structure |
| CN107780949A (en) * | 2017-10-13 | 2018-03-09 | 北京工业大学 | A kind of steel FRP complex waves card tunnel support method |
| WO2020024268A1 (en) * | 2018-08-01 | 2020-02-06 | 中铁第一勘察设计院集团有限公司 | Tunnel precast lining assembly structure and method therefor |
| CN110685255A (en) * | 2019-11-09 | 2020-01-14 | 黄河勘测规划设计研究院有限公司 | Assembled reinforced concrete segment suitable for quick lining of horseshoe tunnel |
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Application publication date: 20211221 |
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