CN111810163A - Nine-lane double-arch construction method for underground excavation through underground longitudinal and transverse channels - Google Patents
Nine-lane double-arch construction method for underground excavation through underground longitudinal and transverse channels Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
Abstract
The invention discloses a nine-lane double-arch construction method for underground excavation through an underground longitudinal and transverse channel. And 3-1 and 3-2 transverse passages are additionally arranged by taking the double-arch right-line outer side wall as a pilot tunnel, and a 4# passage is excavated by constructing to the double-side wall section in advance through the right-line outer side wall. The construction method of 'middle pilot tunnel + double side wall' excavation and the 'semi-closed' technology of double-layer I-steel support, outer side wall first bottom falling and inverted arch are adopted, and the settlement deformation of the construction with the oversized section is effectively inhibited. By adopting a unique design construction process, the construction risk of water leakage at the joint of the intermediate wall is effectively eliminated by adopting a tertiary lining type and a composite intermediate wall design; the longitudinal (5#) and transverse (2#, 4#) temporary channels are adopted to realize the hidden excavation and hole entry and hole exit, and the 3-1# and 3-2# transverse channels are additionally arranged, so that the rapid construction of each pilot hole of the middle pilot hole and the double-arch pilot holes is realized, and the cost reduction and efficiency improvement performance is obvious.
Description
Technical Field
The invention relates to a nine-lane double-arch construction method for underground excavation of a tunnel through an underground longitudinal and transverse channel, and belongs to the field of super-large section double-arch tunnel construction.
Background
With the further development of coastal areas, the population is more and more dense, and cities are congested, particularly, only sea-crossing bridges are used for traffic inside and outside island-type urban islands, so that the traffic pressure is high, and the influence of disastrous weather is large. Therefore, the construction of the tunnel at the bottom of the sea inside and outside the island, the communication of the urban road junction inside and outside the island and the traffic outside the island have obvious advantages for ensuring driving safety, shortening driving range, avoiding disasters and the like, but the tunnel at the underground large-section highway in the urban area, the communication and the like are limited by the plane position, the linear line expansion, the wiring at two ends, the thickness of the middle rock-included column and the like, and the separated tunnel or the tunnel with small clear distance cannot be realized; in addition, the open cut method has great influence on the surrounding environment and traffic, open cut explosion control is difficult, and external factors have great interference on construction. Therefore, the multi-arch tunnel form is preferably selected to meet the requirements of separation of the uplink tunnel and the downlink tunnel, small wiring difficulty at two ends, small occupied area and small influence on environmental protection and surrounding environment.
A city trunk road is penetrated under a certain submarine tunnel land section and consists of a small clear distance tunnel, double arch tunnels (ultra-shallow buried, ultra-large section-nine lanes, variable cross section and asymmetry) and deep foundation pit open cut underground intercommunication sections (with ramps), wherein double arch zero excavation entering cannot be realized due to the middle mark section at the position; the open cut section is influenced by traffic guide modification, pipeline moving modification, mass fender post pile foundation rock entering, blasting excavation and the like, so that the construction period is long; if the open cut sections finish the enclosure structure, after the enclosure structure is excavated to a certain elevation, double-arch tunnel entering construction is carried out, and vertical slag lifting and transportation are carried out by utilizing the open cut sections, so that the working efficiency is low, the construction period is difficult to guarantee, and the progress of the whole project is influenced; how to realize the synchronous implementation of double-arch tunnel entrance construction and open cut section enclosure construction and realize double-arch excavation horizontal transportation to improve work efficiency, and the construction of the 'nine-lane' ultra-large section double-arch tunnel underpass city trunk has fewer referenced domestic and foreign engineering cases, and is worth further in-depth research.
The traditional double arch tunnel is a zero-excavation tunnel, two ends of the tunnel are provided with working wells, and the underground intercommunication bifurcation large section is changed from a single-side gradually enlarged section → double arch section excavation → small-clear-distance section conversion.
The conventional double-arch tunnel is excavated by a 'three-pilot-tunnel' method, the middle partition wall and the side walls of the double-arch tunnel are back-built in a retreating mode, and then main tunnel excavation and tunnel entering construction is carried out after the completion, so that the construction period is long.
The construction of the nine-lane oversized cross section double arch tunnel underpass urban main road has fewer referenced domestic and foreign engineering cases.
The hole entering mode of the prior art scheme is that the hole entering mode of 'zero excavation' and the hole entering mode of a working well are that the zero excavation hole entering mode is difficult to realize due to the fact that the double-arch sections are connected with the open excavation sections of the deep foundation pit; the construction method is characterized in that a working well is arranged for entering a tunnel, the construction period is long, the vertical slag lifting process is low, the construction cost is high, the open cut section is inserted into a traffic guide, only half construction can be performed, south is performed first and then north is performed, so that the working well can be arranged by only half, the requirements of each guide tunnel of a double-arch right line and the requirement of entering the middle guide tunnel are met, the left line needs to be subjected to traffic migration to the south side, then the construction of the other half working well is performed, the construction of each guide tunnel of the double-arch left line is performed, the interference of each guide tunnel in vertical transportation is large, the work efficiency is low, the organization difficulty is large, the open cut section is excavated to the bottom until the south side is excavated, after the construction of the bottom plate is completed, the bottom plate can enter the open cut section from a ramp, a double-arch horizontal transportation.
The construction process comprises the following steps: the three-pilot-hole method comprises the steps of excavation, straight-forward excavation and straight-backward construction, the process conversion is more, the construction period is longer, the conventional double-arch hole-entering mode is adopted in combination with the special construction environment of the project, the left line does not enter the hole simultaneously with the right line, the three pilot holes are difficult to ensure to be constructed simultaneously, the three pilot holes cannot penetrate through double-arch sections in advance and enter the double-side wall section construction, the construction period is difficult to shorten, and the project is difficult to be communicated in the early days.
Disclosure of Invention
The invention aims to realize the hidden excavation and the hole entering of double-linked arches in the construction process of the double-linked arches of nine lanes, and the construction is synchronously carried out with open excavation sections, thereby shortening the construction period. A horizontal transportation channel for double-arch underground excavation and cave entry construction is searched, and the construction efficiency is improved; optimizing a middle pilot tunnel construction process, realizing synchronous construction of middle pilot tunnel excavation and mid-partition wall lining, and creating conditions for subsequent large tunnel synchronous construction; the double-arch right-line outer side wall is used as a leading pilot tunnel, construction is carried out to the double-side wall sections in advance, the working face is expanded, and the problem of the overall construction period is solved.
1. The existing inclined shaft → C ramp construction is carried out to the underground intercommunicating intersection of the open cut section, a temporary longitudinal channel (synchronously constructed with the open cut section) is excavated to penetrate the open cut foundation pit to the end part of the double-arch and increase the transverse channel, and the tunneling of the ultra-large section double-arch is realized according to the principle of 'from near to far and from high to low' in the channel, and the tunnel is excavated into the tunnel in a hidden way in a layered, segmented and guide way mode.
2. The outer side wall of the right line of the multi-arch tunnel is used as a leading pilot tunnel, a transverse channel is continuously added to the middle pilot tunnel, conditions are created for synchronous construction of middle pilot excavation and middle partition wall lining, meanwhile, the double-side wall sections are excavated in advance, the working face is added, and the construction period is shortened.
3. The construction method of 'middle pilot tunnel + double side walls' is adopted, the outer side walls of the left line and the right line are combined with the left pilot tunnel and the right pilot tunnel by the 'three pilot tunnels', the construction organization is simplified, and the construction period is saved.
4. The excavation sequence of each pilot tunnel and the excavation sequence of the tunnel body section of the double-arch underground excavation tunnel are technical keys.
5. The key technology of 'light and shade connection' longitudinal and transverse channel 'undercut' hole entry and 'dark connection' hole exit stability control.
6. The construction time and the construction process of the double-layer primary support, the double-layer I-steel support, the outer side wall first falling bottom and the inverted arch 'semi-closed' technology effectively control the construction settlement deformation; and underground longitudinal and transverse channels are arranged to realize the hidden excavation of the double arch tunnels into the holes.
The invention adopts the technical scheme that a nine-lane double-arch construction method for underground excavation through an underground longitudinal and transverse channel comprises the following steps:
s1, the double-arch underground excavation construction enters a C ramp from an inclined shaft to the branch of an open excavation section, a deep foundation pit open excavation section is penetrated to the end part of the double-arch through a 5# temporary longitudinal channel, and a 2# transverse channel is additionally arranged;
s2, excavating a 2# transverse channel by steps for a certain step distance, constructing a double-arch right-line hole large pipe shed, sequentially starting double-layer supporting construction of a 1# hole and a 2# hole, and constructing a primary support reinforcing layer in cooperation with a first layer of primary support;
s3, taking the 1# hole as a main transportation channel for advanced construction, excavating a 3-1# transverse channel into the 0# hole obliquely downwards, increasing the excavation surface and reverse bottom-falling construction of the 0# hole, constructing a hole opening section intermediate wall, excavating the 3# hole, sequentially opening 4#, 5# and 6# hole opening sections at proper time, and symmetrically excavating the 4# hole and the 3# hole for construction so as to eliminate the bias voltage of the 0# hole intermediate wall;
s4, after the 3# hole is ahead of the 2# hole by a certain step distance, according to the double-side wall excavation construction method, the left and right pilot pits are firstly constructed, the middle pilot pit is constructed later, and the construction of the 4#, 6# and 5# hole body sections is sequentially carried out.
S5, continuing advancing excavation construction of the tunnel No. 1, excavating a transverse channel No. 3-2, excavating the tunnel No. 0 in a head-on manner, and simultaneously enlarging an excavation surface to provide a transportation channel for subsequent mid-partition construction;
s6, excavating a leading 3-1# channel in the No. 2 hole, starting the construction of the side wall, the primary support of the inverted arch and the primary support of the inverted arch in the No. 3 hole, dismantling the temporary support after the ring is closed, and sequentially constructing three-lining inverted arch, backfilling, three-lining arch lining and an auxiliary structure;
s7, when the 1# hole is excavated to the junction of the double-connected arch and the double-side wall, the 4# transverse passage is additionally arranged to meet the double-connected arch hole outlet and the double-side wall section hole inlet construction;
and the 2# transverse channel in the S1 is sequentially unfolded into the 2# channel and double-arch construction according to the principle of 'from near to far and from top to bottom' by steps and guide holes.
Compared with the prior art, the invention has the following technical effects:
1. through the arrangement of the underground temporary longitudinal and transverse channels, the construction of double-arch underground excavation and cave entry is realized, a horizontal transportation channel is formed, the construction efficiency is improved, and the construction is synchronously carried out with an open excavation section, so that the construction period is shortened.
2. The double-arch right-line outer side wall is used as a leading pilot tunnel, 3-1 and 3-2 transverse passages are additionally arranged, synchronous construction of middle pilot tunnel (0# tunnel) excavation and middle partition wall lining is achieved, conditions are created for subsequent 3# tunnel and 4# tunnel bottom-falling construction, meanwhile, the right-line outer side wall is used for constructing the double-side wall sections in advance, 4# passages are excavated, double-side-wall hidden excavation and double-arch reverse excavation are achieved, butt joint construction of facing-in and out tunnels is achieved, the problem of the total project construction period is solved, and the project construction period is about 10 months ahead of the original node construction period.
3. The construction method of 'middle pilot tunnel + double side wall' excavation and the 'semi-closed' technology of double-layer I-steel support, outer side wall first bottom falling and inverted arch are adopted, and the settlement deformation of the construction with the oversized section is effectively inhibited.
4. By adopting a unique design construction process, the construction risk of water leakage at the joint of the intermediate wall is effectively eliminated by designing the tertiary lining type (double primary support and single secondary lining) and the composite intermediate wall;
5. the longitudinal (5#) and transverse (2#, 4#) temporary channels are adopted to realize the hidden excavation and hole entry and hole exit, and the 3-1# and 3-2# transverse channels are additionally arranged, so that the rapid construction of each pilot hole of the middle pilot hole and the double-arch pilot holes is realized, and the cost reduction and efficiency improvement performance is obvious.
Drawings
FIG. 1 is a plan view of a double-arch construction organization.
Figure 2 double arch tunnel-variable cross section.
Figure 3 double arch tunnel-longitudinal and transverse channels are excavated into the tunnel.
FIG. 4 is a sequence diagram of double arch excavation.
Detailed Description
The research is carried out by taking the construction of the coastal ultra-shallow buried super-large section double-arch tunnel as a support under the complex condition. The main road for the city to pass through under a certain submarine tunnel land section consists of a small clear distance tunnel, a 160m double-arch tunnel (which is ultra-shallow buried (5.922-13.386 m), an ultra-large section-nine lanes (total span 45.73m and contains a middle pilot tunnel 559.05 square meter), a variable cross section (four times), an asymmetric main road for the city to pass through under the sea), and a deep foundation pit open cut underground intercommunication section (with a ramp), wherein the double-arch zero excavation can not be realized due to the middle mark section at the ground; the open cut section is influenced by traffic guide modification, pipeline moving modification, mass fender post pile foundation rock entering, blasting excavation and the like, so that the construction period is long; if the open cut sections finish the enclosure structure, after the enclosure structure is excavated to a certain elevation, double-arch tunnel entering construction is carried out, and vertical slag lifting and transportation are carried out by utilizing the open cut sections, so that the working efficiency is low, the construction period is difficult to guarantee, and the progress of the whole project is influenced;
through continuous technical scheme research, the innovation has been provided and has been directed against the super shallow special construction environment of burying two even hunch tunnels of super large section, sets up the interim vertical and horizontal passageway in underground, according to "from near to far away, by the principle of high to low", realized that two even hunch tunnels of super large section are big for, and layering, subsection, branch pilot tunnel undercut are into the hole, and are relatively independent with the open cut section, and synchronous construction, and concrete process is as follows:
1. the main characteristics of 160m 'unconventional' double-arch tunnel
(1) Near the sea
Near the western sea area of the mansion, like a weak surrounding rock beach backfilling area of a bonded area, the right line is close to the mountain body, and the water system is rich in supply;
(2) ultra shallow buried
The tunnel is buried deeply, the right line is 5.922-13.386 m, and the left line is 6.578-12.883 m;
(3) large span-super large section
The maximum excavation section of a single hole is 22.8m, the section is 249.35 square meters, the total excavation span is 45.73m, the section is 559.05 square meters, and the excavation height is 15.1 m;
(4) variable cross section
The four variable cross sections are sequentially widened from SJ1 → SJ4 by 1.5m, 3.0m, 4.5m and 5.1m compared with the normal three-lane cross section; the lining type is determined in sections according to the widening size, a sudden change form is adopted, and a variable cross-section changing trolley is adopted for construction for three times of lining;
(5) asymmetry
The line position of the double arch tunnel section is positioned in a transition section and an acceleration and deceleration lane section which are communicated underground, the left line and the right line are respectively provided with a ramp, and because the positions of the ramps are different, the left line and the right line of the double arch tunnel section are different in transition and the sections on the two sides are asymmetrical; the bias voltage and the asymmetry phenomenon also exist in the excavation process;
(6) digging into hole in hidden way
The conventional double-arch tunnel is a zero-excavation tunnel or two-end working well tunnel, and the temporary communication holes are firstly enlarged from the lower part of the open-excavated foundation pit to reach the end part of the double-arch tunnel due to the limitation of the construction period of the double-arch tunnel under the condition that the open-excavated deep foundation pit at one end is not reached to the bottom, a transverse channel is opened, and each pilot hole of the double-arch tunnel is constructed in a hidden-excavation mode in the channel;
(7) underpass urban main road
During construction of each double-arch pilot tunnel, the left line is positioned below the traffic lane, and the outer side wall of the right line, the middle pilot tunnel and the left line are all positioned below the permanent traffic lane;
(8) unconventional double arch tunnel
Entering a hole and excavating: according to the principle of 'from near to far and from high to low', sequentially excavating holes, namely a hole 1 → a hole 2 → a hole 0 → a hole 3 → a hole 4 → a hole 5 → a hole 6;
the hole body excavation sequence is as follows: 1# hole advanced excavation construction, a main transportation channel is provided, and conditions are provided for subsequent 0# hole reverse bottom falling excavation (0# hole is low in elevation and difficult to perform front bottom falling construction in a 2# transverse channel), working face increasing and synchronous structure construction; after the lining of the partition wall in the hole 0# is constructed for a certain distance, the hole 1# and the hole 3# are adhered to be in advance, the hole 2# is lagged and closed, and the hole 4# and the hole 3# are symmetrically excavated to eliminate the problem of bias voltage of the partition wall in the hole 0 #;
the method comprises the following steps that (1) a hole body excavation section is performed, after a partition wall in a No. 0 hole is poured, the excavation is strictly performed according to a double-side wall excavation step sequence, and a 3-1 transverse channel and a 3-2 transverse channel are continuously opened through a preceding No. 1 hole so as to solve the problem of traffic transportation that the No. 0 hole is continuously excavated forwards and a partition wall lining is constructed;
(9) advantage of reasonable excavation sequence
According to the 160m double arch tunnel, the direction of a basement rock surface, the south height, the north height, the east height, the west height, the south side close to a mountain body and a water system supply are adopted, the water system supply of the mountain body on the south side is cut off after the 1# hole and the 0# hole are constructed in advance, the 0# hole is low in elevation and plays a role in dewatering and draining a stratum after tunneling, the subsequent excavation of 2#, 3#, 4#, 5# and 6# pilot tunnel face is in an anhydrous state, and the stratum above the vault basement rock layering is basically in a self-stabilizing state;
the 4# hole and the 3# hole are symmetrically excavated, the risk that the partition wall has bias voltage is eliminated, the 4# hole is ahead of the 5# hole and the 6# hole, when the subsequent left line is excavated, the right line is constructed for three times of lining, and the 4# hole is used as a free surface of blasting excavation of the left line, so that the damage of blasting excavation of the left line to three linings of the right line is eliminated;
synthesize above-mentioned characteristics of this doubly-linked arch tunnel, compare with traditional doubly-linked arch tunnel, combined type mid-board structural style takes advantage in water-proof effects, and ingenious excavation order has reduced the construction risk of the lane excavation of passing under the left-hand thread, constantly increases horizontal construction passageway, has solved the difficult problem of transportation, and multiple spot, each process are under construction in step, have shortened construction period greatly, have gained considerable economy and social.
2. Due to the limitation of the construction period of the multi-arch tunnel, under the condition that an open-cut deep foundation pit at one end is not bottomed, firstly, a temporary communication hole is additionally arranged from the lower part of the open-cut foundation pit, the temporary communication hole reaches the end part of the double-arch, a transverse channel is arranged, each pilot tunnel of the double-arch is arranged in the channel in a hidden-cut mode for construction, a No. 4 transverse channel is arranged through advanced construction on the outer side of the double side wall, the hidden-cut tunnel of the double side wall and the reverse excavation of the double-arch are realized, the construction of a front-to-back tunnel is realized, 13 pilot tunnel portal doors are connected at the No. 4 channel, and the;
3. the specific construction process comprises the following steps:
(1) the double-arch underground excavation construction is carried out by entering a C ramp to the branch position of an open excavation section from an inclined shaft, penetrating a deep foundation pit open excavation section (leading to the first) to the end part of the double-arch through a 5# temporary longitudinal channel, increasing a 2# transverse channel, and sequentially expanding the 2# channel and the double-arch construction by dividing steps and divided pilot tunnels according to the principle of from near to far and from top to bottom;
(2) after a 2# transverse channel is excavated by steps at a certain step distance, constructing a double-arch large pipe shed at a right-line hole, sequentially starting double-layer supporting construction of a 1# hole and a 2# hole (excavating 15m to form three steps and seal a tunnel face), and constructing a primary support reinforcing layer next to a first primary support;
(3)1# hole is used as a main transportation channel for advanced construction, a 3-1# transverse channel is obliquely and downwards excavated to a 0# hole at a position of 45m, an excavation surface and a reverse bottom falling construction of the 0# hole are added (due to the fact that the elevation of the 0# hole is low, the front bottom falling is difficult), a hole section 40m middle partition wall is constructed in time, then a 3# hole is excavated, 4#, 5# and 6# hole sections are sequentially and timely opened, and the 4# hole and the 3# hole are symmetrically excavated and constructed to eliminate the problem of bias voltage of the 0# hole middle partition wall;
(4) after the 3# hole is ahead of the 2# hole by a certain step distance, the construction method of double-side wall excavation is followed, the left and right pilot pits are firstly constructed, the middle pilot pit is constructed in a lagging way, and the construction of the 4#, 6# and 5# hole body sections is sequentially carried out.
(5) The 1# hole is continuously subjected to advanced excavation construction, a 3-2# transverse channel is excavated at a position of 100m in time, the 0# hole is excavated in a facing mode, meanwhile, an excavation surface is expanded, and a transportation channel is provided for subsequent mid-partition wall construction;
(6) after a No. 2 hole is excavated and leads to a 3-1 channel, the construction of a No. 1 hole side wall, an inverted arch primary support and an inverted arch primary support of a No. 3 hole is started, after the hole is sealed and looped, a temporary support is removed, and three-lining inverted arch and backfilling, three-lining arch lining (adopting a variable cross-section reloading trolley for construction) and an auxiliary structure are sequentially constructed;
(7) when the No. 1 hole is excavated to the junction of the double-connected arch and the double side walls, the No. 4 transverse channel is additionally excavated to meet the double-connected arch hole and the double side wall sections for hole entering construction;
1. through the arrangement of the underground temporary longitudinal and transverse channels, the construction of double-arch underground excavation and cave entry is realized, a horizontal transportation channel is formed, the construction efficiency is improved, and the construction is synchronously carried out with an open excavation section, so that the construction period is shortened.
2. The double-arch right-line outer side wall is used as a leading pilot tunnel, 3-1 and 3-2 transverse passages are additionally arranged, synchronous construction of middle pilot tunnel (0# tunnel) excavation and middle partition wall lining is achieved, conditions are created for subsequent 3# tunnel and 4# tunnel bottom-falling construction, meanwhile, the right-line outer side wall is used for constructing the double-side wall sections in advance, 4# passages are excavated, double-side-wall hidden excavation and double-arch reverse excavation are achieved, butt joint construction of facing-in and out tunnels is achieved, the problem of the total project construction period is solved, and the project construction period is about 10 months ahead of the original node construction period.
3. The construction method of 'middle pilot tunnel + double side wall' excavation and the 'semi-closed' technology of double-layer I-steel support, outer side wall first bottom falling and inverted arch are adopted, and the settlement deformation of the construction with the oversized section is effectively inhibited.
4. By adopting a unique design construction process, the construction risk of water leakage at the joint of the intermediate wall is effectively eliminated by designing the tertiary lining type (double primary support and single secondary lining) and the composite intermediate wall;
5. the longitudinal (5#) and transverse (2#, 4#) temporary channels are adopted to realize the hidden excavation and hole entry and hole exit, and the 3-1# and 3-2# transverse channels are additionally arranged, so that the rapid construction of each pilot hole of the middle pilot hole and the double-arch pilot holes is realized, and the cost reduction and efficiency improvement performance is obvious.
Claims (2)
1. A nine-lane double-arch construction method for underground excavation through underground longitudinal and transverse channels is characterized in that: the method comprises the following steps:
s1, the double-arch underground excavation construction enters a C ramp from an inclined shaft to the branch of an open excavation section, a deep foundation pit open excavation section is penetrated to the end part of the double-arch through a 5# temporary longitudinal channel, and a 2# transverse channel is additionally arranged;
s2, excavating a 2# transverse channel by steps for a certain step distance, constructing a double-arch right-line hole large pipe shed, sequentially starting double-layer supporting construction of a 1# hole and a 2# hole, and constructing a primary support reinforcing layer in cooperation with a first layer of primary support;
s3, taking the 1# hole as a main transportation channel for advanced construction, excavating a 3-1# transverse channel into the 0# hole obliquely downwards, increasing the excavation surface and reverse bottom-falling construction of the 0# hole, constructing a hole opening section intermediate wall, excavating the 3# hole, sequentially opening 4#, 5# and 6# hole opening sections at proper time, and symmetrically excavating the 4# hole and the 3# hole for construction so as to eliminate the bias voltage of the 0# hole intermediate wall;
s4, advancing the 3# hole by a certain step distance than the 2# hole, performing left and right pilot tunnel construction in advance and middle pilot tunnel construction in delay according to a double-side-wall excavation construction method, and performing 4#, 6# and 5# hole body section construction in sequence;
s5, continuing advancing excavation construction of the tunnel No. 1, excavating a transverse channel No. 3-2, excavating the tunnel No. 0 in a head-on manner, and simultaneously enlarging an excavation surface to provide a transportation channel for subsequent mid-partition construction;
s6, excavating a leading 3-1# channel in the No. 2 hole, starting the construction of the side wall, the primary support of the inverted arch and the primary support of the inverted arch in the No. 3 hole, dismantling the temporary support after the ring is closed, and sequentially constructing three-lining inverted arch, backfilling, three-lining arch lining and an auxiliary structure;
s7 when the 1# hole is excavated to the junction of the double-connected arch and the double-side wall, the 4# transverse passage is increased to meet the double-connected arch hole and the double-side wall section hole entering construction.
2. The nine-lane double-arch construction method for underground excavation through the underground longitudinal and transverse channels according to claim 1, is characterized in that: and the 2# transverse channel in the S1 is sequentially unfolded into the 2# channel and double-arch construction according to the principle of 'from near to far and from top to bottom' by steps and guide holes.
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Cited By (5)
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| CN112523759A (en) * | 2020-11-30 | 2021-03-19 | 中铁十八局集团有限公司 | Construction method for converting double-arch tunnel and small-clear-distance tunnel in underground transverse channel |
| CN112554889A (en) * | 2020-11-30 | 2021-03-26 | 中铁十八局集团有限公司 | Method for synchronously excavating pilot tunnel and lining middle partition wall in double arch tunnel |
| CN112554906A (en) * | 2020-12-01 | 2021-03-26 | 中铁十八局集团有限公司 | Asymmetric excavation construction organization method for super-large section double arch tunnel |
| CN112610221A (en) * | 2020-12-15 | 2021-04-06 | 重庆大学 | Construction method for oversized section and gradual change section of bifurcation part of highway tunnel |
| CN113818888A (en) * | 2021-10-22 | 2021-12-21 | 四川省交通勘察设计研究院有限公司 | Hard rock multi-arch tunnel blasting process |
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| CN112610221A (en) * | 2020-12-15 | 2021-04-06 | 重庆大学 | Construction method for oversized section and gradual change section of bifurcation part of highway tunnel |
| CN113818888A (en) * | 2021-10-22 | 2021-12-21 | 四川省交通勘察设计研究院有限公司 | Hard rock multi-arch tunnel blasting process |
| CN113818888B (en) * | 2021-10-22 | 2024-03-26 | 四川省交通勘察设计研究院有限公司 | Hard rock multi-arch tunnel blasting process |
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Application publication date: 20201023 |