CN112523759B - Construction method for converting double-arch tunnel and small-clear-distance tunnel in underground transverse channel - Google Patents
Construction method for converting double-arch tunnel and small-clear-distance tunnel in underground transverse channel Download PDFInfo
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- CN112523759B CN112523759B CN202011374811.XA CN202011374811A CN112523759B CN 112523759 B CN112523759 B CN 112523759B CN 202011374811 A CN202011374811 A CN 202011374811A CN 112523759 B CN112523759 B CN 112523759B
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000009412 basement excavation Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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Abstract
The invention discloses a construction method for converting a double arch tunnel and a small clear distance tunnel in an underground transverse passage, which comprises the following steps: step 1) firstly excavating a 1# hole on the outer side wall of the right line of the double-arch tunnel section, additionally excavating a transverse channel when the double-arch 1# hole is excavated to the junction of the double-arch tunnel section and the small clear distance tunnel section, performing hidden excavation of the small clear distance tunnel section in the transverse channel, and meanwhile reversely excavating and facing the double-arch tunnel to discharge the double-arch tunnel; step 2), firstly, sealing the double arch 1# hole to form a ring, and excavating a transverse channel on the vertical side wall of the double arch 1# hole; step 3), breaking the side wall arch center of the transverse passage in the pilot tunnel range; step 4) in the bottom falling process of the transverse channel, an H-shaped portal is manufactured by adopting H-shaped steel to reinforce the partition wall between the small clear distance tunnel and the double arch tunnel; and 5) forming the falling bottom of each opening side wall of the small-clear-distance double-side-wall tunnel section and the double-arch tunnel section. The invention realizes the multipoint synchronous construction of the small clear distance tunnel section, the double arch tunnel section and the open cut section and solves the problem of the overall project construction period.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for converting a double arch tunnel and a small clear distance tunnel in an underground transverse passage.
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 inner and outer undersea of the island to communicate the urban road junction in the island with the traffic outside the island has obvious advantages of ensuring driving safety, shortening a vehicle range, avoiding disasters and the like, but the separated tunnel cannot be realized due to factors such as plane positions, linear extension lines, two-end connection lines, thickness of middle rock-holding columns and the like of the tunnel passing through the main road underground large-section road tunnel in the urban area and intercommunication; 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 mode transition of the multi-arch tunnel and the small-clear-distance tunnel is preferentially selected to meet the requirements of separation of the upper tunnel and the lower tunnel, small wiring difficulty at two ends, small occupied area and small influence on environmental protection and the surrounding environment.
A city main road is penetrated under a certain submarine tunnel land section and consists of a small clear distance tunnel, a double arch tunnel (ultra-shallow buried, ultra-large section-nine lanes, variable section and asymmetry) and a deep foundation pit open-cut underground intercommunicating section (with ramp), and because the construction period is short, synchronous construction is required as far as possible to realize multi-point operation; how to realize double-arch underground excavation and entry before the open cut section is excavated, and open a horizontal transportation channel to the joint of the double-arch and the small clear distance tunnel, and expand the transverse channel, and carry out the conversion of the double-arch and small clear distance tunnel underground excavation and entry system in the channel, has few referenced domestic and foreign engineering cases, and is worth further deep research.
Traditional double arch tunnel links up the section with little clear distance tunnel, needs to set up the working well in synchronous construction, carries out the business turn over hole construction in the working well, realizes the conversion in double arch tunnel and little clear distance tunnel. But the synchronous construction of the traditional double arch tunnel and the small clear distance tunnel connection section has the following defects: (1) The construction boundary conditions are strict, a working well is arranged to realize the conversion between a small clear distance tunnel and a multi-arch tunnel, and the construction of shallow tunnels and occupied roads is required; (2) The working well needs to be firstly constructed with an enclosure structure, excavated, side wall built-back and a ring frame beam, small clear distance tunnels and multi-arch tunnel portals are reserved, so that the vertical transportation and construction efficiency are extremely low, and the construction period is long; (3) When blasting excavation is needed, mechanical equipment needs to be hoisted to the outside of a well, and meanwhile, safety protection facilities need to be arranged at the inlet of the mechanical equipment, so that construction interference factors are more; (4) Facilities such as mechanical equipment, mucking, concrete spraying, materials, personnel getting on and off, wind, electricity and ventilation need to go up and down from a working well, and the space is small.
Disclosure of Invention
The invention aims to provide a construction method for converting a double-arch tunnel and a small-clear-distance tunnel in an underground transverse channel, which solves the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a construction method for converting a double-arch tunnel and a small-clear-distance tunnel in an underground transverse channel, which comprises the following steps of:
step 1) using a front-line outer side wall 1# hole of a double-arch tunnel section as a main transportation channel for construction in advance, when the double-arch 1# hole is excavated to the junction of the double-arch tunnel section and a small-clear-distance double-side wall tunnel section, increasing a 4# transverse channel, carrying out underground excavation of the small-clear-distance double-side wall tunnel section into the 4# transverse channel according to the principle of from near to far and from high to low, and simultaneously reversely excavating the double-arch tunnel and leading the double-arch tunnel to exit, wherein at the moment, 13 pilot tunnels are excavated in order;
step 2) firstly sealing the double-arch 1# hole into a ring, excavating a 4# transverse channel on the vertical side wall of the double-arch 1# hole, excavating sequentially by steps, sequentially mounting I-shaped steel frames at the left and right line hole openings of the double-side wall tunnel and I-shaped steel frames at the left and right line of the double-arch tunnel on the two side walls of the 4# transverse channel, effectively welding the I-shaped steel frames with the side wall arch frames of the 4# transverse channel, and applying an advanced pipe shed and an advanced small pipe for effective fixation;
step 3) breaking the 4# transverse channel side wall arch centering within the range of 13 pilot tunnels one by one, so that two sides of the 4# transverse channel main arch centering fall on the small-clear-distance double-side-wall double-arch centering at the double-connected arch opening, and an effective dark-phase continuous in-out tunnel stress stabilization system is formed;
step 4) in the step-by-step bottom falling process of the No. 4 transverse channel, H-shaped steel is adopted to manufacture an H-shaped portal frame, and the stress weak link of the middle partition wall of the small-clear-distance double-side-wall tunnel and the double-arch tunnel is longitudinally reinforced, so that the construction safety is ensured;
and 5) forming the side walls of the openings of the small-clear-distance double-side-wall tunnel section and the double-arch tunnel section to fall to the bottom, so as to form a stable stress system of the opening section.
Further, in the step 2), I22I-shaped steel frames of the left and right line holes of the double-side-wall tunnel and I25I-shaped steel frames of the left and right line of the double-arch tunnel are sequentially arranged on the side walls of the two sides of the 4# transverse channel.
Further, in the step 4), in the step-by-step bottom falling process of the 4# transverse channel, H25 section steel is adopted to manufacture the H-shaped portal frame.
Compared with the prior art, the invention has the following beneficial technical effects:
the construction method for converting the double-arch tunnel and the small clear distance tunnel in the underground transverse channel utilizes the outer side wall of the right main hole of the double-arch tunnel to reach the joint of the small clear distance tunnel and the double-arch tunnel in advance to serve as a horizontal transportation channel, so that the construction efficiency is improved; in addition, a transverse channel is additionally arranged in a guide pit of the front side wall close to the end of the small clear distance tunnel, the small clear distance tunnel is sequentially expanded into a buried excavation tunnel, the multi-arch tunnel is reversely excavated and is connected with the excavation tunnel, and 13 guide hole excavation constructions are sequentially carried out according to the principle of from near to far and from high to low, so that the system conversion of the dual-arch tunnel and the small clear distance tunnel in the underground transverse channel is realized, the multi-point operation is realized, and the construction period is shortened; through the weak link of partition wall atress in little clean distance and the double arch tunnel, increase H type portal and carried out vertical reinforcement to well double-layered rock pillar, guaranteed that the interior dark of vertical and horizontal passageway links into and out of the cave stability control mutually, guaranteed construction safety, realized little clean distance tunnel section, double arch section and open cut section multiple spot synchronous construction, solve the project overall period problem.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a connection relationship diagram of a small clear distance double-side wall tunnel section, a double-arch tunnel section and an open cut section of the construction method for converting a double-arch tunnel and a small clear distance tunnel in an underground transverse passage;
FIG. 2 is a schematic view of a cross section of a double arch tunnel section of the construction method for converting a double arch tunnel and a small clear distance tunnel in an underground transverse passage according to the present invention;
FIG. 3 is a schematic view of the cross section of a small clear distance double-side wall tunnel segment of the construction method for converting the double-multiple-arch tunnel and the small clear distance tunnel in the underground transverse passage;
FIG. 4 is a schematic diagram of the construction method for converting a double-arch tunnel and a small-clearance tunnel in an underground transverse passage, wherein the small-clearance double-side-wall No. 1 tunnel is firstly converted into a No. 4 transverse passage to realize that the small-clearance double-side walls are guided into the tunnel one by one;
fig. 5 is a connection relationship diagram between the 4# transverse channel, the small-clear-distance double-side-wall tunnel section and the double-arch tunnel section in the construction method for converting the double-arch tunnel and the small-clear-distance tunnel in the underground transverse channel.
Description of the reference numerals: 1. a small clear distance double-side wall tunnel segment; 2. a double arch tunnel segment; 3. an open cut section; 4. double arch No. 0 hole; 5. 1# hole of double arch; 6. double arch 2# hole; 7. double arch No. 3 holes; 8. double arch 4# hole; 9. double arch No. 5 holes; 10. double arch No. 6 holes; 11. small clear distance double side wall 1# hole; 12. small clear distance double side wall 2# hole; 13. small-clear-distance double-side-wall No. 3 holes; 14. small clear distance double side wall 4# hole; 15. small clear distance double side wall 5# hole; 16. small-clear-distance double-side-wall No. 6 holes; 17. 4# transverse channel.
Detailed Description
The underground transverse channel is arranged to realize the underground excavation of the small clear distance tunnel and the double-arch tunnel into and out of the tunnel, and the research is carried out by taking the construction of the double-arch tunnel with the ultra-shallow buried and ultra-large section near the sea under the complex condition as the support.
A city trunk road is penetrated under a certain submarine tunnel land section and consists of a small clear distance tunnel (3.304 m), a 160m double-arch tunnel (5.922-13.386 m ultra-shallow buried), and a nine-lane (total span 45.73m and middle pilot hole 559.05 m) 2 The construction method comprises the following steps of, four times of variable cross section, asymmetry, downward crossing of urban main roads), and formation of a deep foundation pit open-cut underground intercommunication section (with ramp), synchronous construction as far as possible is tightly needed due to construction period, multi-point operation is realized, the outer side wall of the right line of the double-arch tunnel section 2 is advanced to the tail end of a small clear distance and double-arch tunnel, a transverse channel is additionally arranged, the hidden-cut tunnel is sequentially expanded into a hole from near to far and from high to low, the double-arch tunnel is reversely excavated and is connected out of the hole in a head-on manner, 13 pilot holes are excavated, synchronous multi-point construction of the small clear distance section, the double-arch tunnel section and the deep foundation pit open-cut section 3 is realized, the construction method is a horizontal transportation channel, the work efficiency is high, the construction period is greatly shortened, and the progress of the whole project is ensured, and the specific process is as follows:
as shown in fig. 1 to 5, a construction method for converting a double arch tunnel and a small clear distance tunnel in an underground transverse passage includes the following steps:
step 1) firstly utilizing a hole on the outer side wall 1# of the right line of a double-arch tunnel section 2 as a main transportation channel for construction in advance, when the hole on the double-arch 1# is excavated to the junction of the double-arch tunnel section 2 and a small-clear-distance double-side-wall tunnel section 1, additionally excavating a 4# transverse channel 17, carrying out hidden excavation on the small-clear-distance double-side-wall tunnel section 1 into the hole in the 4# transverse channel 17 according to the principle of from near to far and from high to low, and simultaneously reversely excavating the double-arch tunnel and leading the double-arch tunnel out, wherein at the moment, 13 pilot holes are orderly excavated and constructed;
step 2) firstly sealing the double-arch 1# hole into a ring, excavating a 4# transverse channel 17 on the vertical side wall of the double-arch 1# hole, excavating sequentially by steps, sequentially mounting I-shaped steel frames of the left and right line hole openings of the double-side wall tunnel and I-shaped steel frames of the left and right line of the double-arch tunnel on the two side walls of the 4# transverse channel 17, effectively welding the I-shaped steel frames and the left and right line I-shaped steel frames with the 4# transverse channel 17 side wall arch frames, and applying an advanced pipe shed and an advanced small pipe to effectively fix;
step 3) breaking the 4# transverse channel 17 side wall arches in the range of 13 pilot tunnels one by one, so that two sides of the 4# transverse channel 17 main arch fall on the small-clear-distance double-side-wall double-layer arch at the double-connected arch hole, and an effective dark-phase continuous in-out hole stress stabilization system is formed;
step 4) in the step-by-step bottom falling process of the No. 4 transverse channel 17, H-shaped steel is adopted to manufacture an H-shaped portal frame, so that the stress weak link of the small-clear-distance double-side-wall tunnel and the partition wall of the double arch tunnel is longitudinally reinforced, and the construction safety is ensured;
and 5) forming the side walls of the openings of the small-clear-distance double-side-wall tunnel section 1 and the double-arch tunnel section 2 to fall to the bottom, so as to form a stable stress system of the opening section.
The construction method for converting the double-arch tunnel and the small clear distance tunnel in the underground transverse channel utilizes the outer side wall of the main hole on the right line of the double-arch tunnel to reach the joint of the small clear distance tunnel and the double-arch tunnel in advance to serve as a horizontal transportation channel, so that the construction efficiency is improved; and moreover, a transverse channel is additionally arranged in the guide pit of the front side wall close to the small clear distance tunnel end, the small clear distance tunnel is sequentially expanded into a buried excavation tunnel, the multi-arch tunnel is reversely excavated and is connected to a discharge tunnel, and 13 guide tunnel excavation constructions are sequentially carried out according to the principle of from near to far and from high to low, so that the system conversion and the multi-point operation of the dual-arch tunnel and the small clear distance tunnel in the underground transverse channel are realized, and the construction period is shortened.
The three guide holes are 13, namely a double-arch No. 0 hole 4, a double-arch No. 1 hole 5, a double-arch No. 2 hole 6, a double-arch No. 3 hole 7, a double-arch No. 4 hole 8, a double-arch No. 5 hole 9, a double-arch No. 6 hole 10, a small-net-distance double-side-wall No. 1 hole 11, a small-net-distance double-side-wall No. 2 hole 12, a small-net-distance double-side-wall No. 3 hole 13, a small-net-distance double-side-wall No. 4 hole 14, a small-net-distance double-side-wall No. 5 hole 15 and a small-net-distance double-side-wall No. 6 hole 16.
Specifically, in the step 2), I22I-shaped steel frames at the left and right line holes of the double-side-wall tunnel and I25I-shaped steel frames at the left and right line holes of the double-arch tunnel are sequentially arranged on the side walls at the two sides of the No. 4 transverse channel 17.
Specifically, in the step 4), in the step-by-step bottom falling process of the 4# transverse channel 17, the H-shaped portal is made of H25-shaped steel.
In the embodiment, the H-shaped portal is added to longitudinally reinforce the middle rock-sandwiched column through the weak stress link of the middle partition wall of the small clear distance tunnel and the double arch tunnel, so that the stability control of the hidden and hidden continuous in-out tunnel in the longitudinal and transverse channels is ensured, the construction safety is ensured, and the synchronous construction of 3 points of the small clear distance tunnel section, the double arch section and the open cut section is realized.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. The construction method for converting the double-arch tunnel and the small-clear-distance tunnel in the underground transverse channel is characterized by comprising the following steps of:
step 1) utilizing a double-arch 1# hole on the outer side wall of the right line of a double-arch tunnel section as a main transportation channel for advanced construction, when the double-arch 1# hole is excavated to the junction of the double-arch tunnel section and a small-clear-distance double-side wall tunnel section, increasing a 4# transverse channel, carrying out underground excavation and hole entry on the small-clear-distance double-side wall tunnel section in the 4# transverse channel according to the principle of from near to far and from high to low in sequence, and simultaneously carrying out reverse excavation and head-on double-arch tunnel exit on the double-arch tunnel, wherein at the moment, 13 pilot holes are excavated and constructed in order;
step 2) firstly sealing the double-arch 1# hole into a ring, excavating a 4# transverse channel on the vertical side wall of the double-arch 1# hole, excavating sequentially by steps, sequentially mounting I-shaped steel frames at the left and right linear holes of the double-side-wall tunnel and I-shaped steel frames at the left and right linear holes of the double-arch tunnel on the two side walls of the 4# transverse channel, effectively welding the I-shaped steel frames with the side wall arch of the 4# transverse channel, and applying an advanced pipe shed and an advanced small pipe for effective fixation;
step 3) breaking the 4# transverse channel side wall arches in the range of 13 pilot tunnels one by one, so that two sides of the 4# transverse channel main arch fall on the small-clear-distance double-side-wall double-arch at the double-connected arch hole mouth, and an effective dark-phase continuous in-out-hole stress stabilization system is formed;
step 4) in the step-by-step bottom falling process of the No. 4 transverse channel, H-shaped steel is adopted to manufacture an H-shaped portal, and the weak stress links of the partition wall between the small-clear-distance double-side-wall tunnel and the double-arch tunnel are longitudinally reinforced, so that the construction safety is ensured;
and 5) forming the side walls of the openings of the small-clear-distance double-side-wall tunnel section and the double-arch tunnel section to fall to the bottom, so as to form a stable stress system of the opening section.
2. The construction method for converting the double-arch tunnel and the small-clearance tunnel in the underground transverse passage according to claim 1, wherein I22I-steel frames at the left and right side holes of the small-clearance double-side wall tunnel and I25I-steel frames at the left and right side holes of the double-arch tunnel are sequentially installed on the two side walls of the 4# transverse passage in the step 2).
3. The construction method for converting the double-arch tunnel and the small-clearance tunnel in the underground transverse passage according to claim 1, wherein in the step 4), the H-shaped portal frame is made of H25-shaped steel in the step-by-step bottom falling process of the 4# transverse passage.
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