CN111946396A - Innovative tunnel dismantling process - Google Patents
Innovative tunnel dismantling process Download PDFInfo
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- CN111946396A CN111946396A CN202010767104.0A CN202010767104A CN111946396A CN 111946396 A CN111946396 A CN 111946396A CN 202010767104 A CN202010767104 A CN 202010767104A CN 111946396 A CN111946396 A CN 111946396A
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- tunnel
- pile
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
Abstract
The invention discloses an innovative process for tunnel demolition, wherein for an open section, an original SMW construction method pile enclosure structure is changed into a Larsen steel sheet pile enclosure structure, and meanwhile, a mode of soil removal outside the enclosure structure is used for replacing horizontal support in a pit, so that a vertical column pile construction procedure is omitted; for the hidden-buried section, the tunnel hidden-buried section is divided into one annular concrete structure with the interval of 6m and the width of 3m, H-shaped steel is implanted in a demolition area of 6m to replace a lattice column, and after the transverse steel pipe support is installed, the 3m annular structure is demolished to realize demolition of the tunnel, so that the process of constructing the lattice column pile by punching holes on a top plate and a bottom plate is omitted, a plurality of sections are constructed in parallel, demolition efficiency is greatly improved, and the construction period and the influence period on surrounding buildings are shortened; the cost is reduced, and the environmental pollution caused by the construction of the cast-in-place pile and the construction method pile is avoided.
Description
Technical Field
The invention belongs to the technical field of tunnel demolition, and particularly relates to a tunnel demolition innovation process.
Background
The world indoor track and field championship is planned to be held in Nanjing Qingao park in 3 months in 2020, two tunnels and one pipe gallery need to be newly built beside the world indoor track and field championship, and the project needs to be completed before the event. The method comprises the dismantling work of an original tunnel, the review work of 'XX road tunnel dismantling special construction scheme' is completed in 18 months in 2019, the construction area belongs to subway construction, the construction area needs to be reported to subway departments, the record comprises a design scheme and a construction scheme, each procedure is complicated, and the relevant procedures are completed and have construction conditions by the beginning of 5 months.
Considering that the water level of the Yangtze river is increased in the coming flood season of 7 months and the tunnel dismantling operation is influenced, the construction situation requires that the tunnel dismantling operation needs to be completed before 7 months, otherwise, the construction can be continued until the flood season of 9 months is finished, and the construction period for tunnel dismantling is reserved for less than two months.
In addition, roads on two sides of the tunnel to be dismantled must be kept through, so that the width of a construction access road is limited, and the construction access road is a main road with high traffic flow above a hidden buried section entrance reserved close to the south side (about 190m of a tunnel hidden buried section below the main road is reserved). Due to the influence of traffic backflow and construction roads, the removal work of the side walls and the bottom plate of the tunnel in the slope-releasing section can only be carried out in the early period, and the removal of the main structure of the tunnel in the slope-releasing section is completed by the middle ten days of the month 5. According to the original construction process: constructing fender piles, waterproof curtains, dewatering wells, upright piles, supporting and installing, removing tunnels and constructing main structures cannot guarantee completion in two monthly periods, and a breakthrough opening needs to be searched technically.
Disclosure of Invention
In order to solve the problems, the invention discloses an innovative tunnel demolition process, which is characterized in that single line production is converted into parallel construction of a plurality of sections, the demolition efficiency is improved, the construction period is shortened, the cost is reduced, and the environmental pollution caused by the construction of cast-in-place piles and construction method piles is avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an innovative process for tunnel demolition is constructed by two parts:
1) open section of south side: the pile enclosure structure of the original SMW construction method is changed into a Larsen steel sheet pile enclosure structure, meanwhile, the transverse support in a pit is replaced by a mode of soil withdrawal outside the enclosure structure, the arrangement frequency of a dewatering well is determined according to the actual water level observation condition,
2) north buried section + open section:
a: performing annular grooving operation on a bent frame of a buried section of a tunnel at the north side from inside to outside, wherein the bent frame comprises a top plate, side walls, a middle wall and a bottom plate, the bent frame is divided into an annular concrete structure with the interval of 6m and the width of 3-4m, a 3-4m concrete frame between two grooves is reserved as a support, H-shaped steel is implanted in a 6m dismantling area to replace a lattice column, a transverse steel pipe support is installed, and the 3-4m concrete frame is broken and removed after the transverse steel pipe support is installed;
b: keeping 1 bent frame at the boundary of the open section and the buried section immovably, keeping a concrete frame as a middle support, and performing bottom plate slotting by transversely expanding the bent frame of the open section of the north tunnel by 2m from outside to inside according to the pile position and longitudinally expanding each 1 m; implanting H-shaped steel to replace lattice columns at the pile positions, installing transverse steel pipe supports, and dismantling the side walls and the bottom plate of the bent concrete after installation;
c: after the steel pipe supports of the open section and the buried section on the north side are installed, a slot is formed in the south 6m of the boundary of the open section and the buried section, concrete of a top plate, a middle wall, a side wall and a bottom plate is cut off, H-shaped steel is implanted into a pile position, the steel pipe supports are installed, axial force is applied, and the last 3m concrete frame is dismantled.
As an improvement of the invention, the Larsen steel sheet piles in the step (1) are arranged in two rows and are arranged at two sides of a road, and the distance between every two adjacent Larsen steel sheet piles is 1.6 m.
As an improvement of the invention, the two rows of Larsen steel plate piles in the step (1) are spaced by 3.5m and are connected through 20 counter-pulling screw rods, and the corbels are made of 16mm steel plates, and have the size of 20cm by 30cm and the spacing of 2 m.
As an improvement of the invention, the construction of the open section in the step (1) adopts a net hanging and guniting mode to treat the slope, and a 50@1500PVC pipe water drain hole is arranged to ensure the stability of the slope.
As a modification of the invention, in the step (2), the length of the H-shaped steel is 15m, the size is 700 x 300, and 2 transverse frames are arranged in each bent frame, so that the rest part of the exposed height of the H-shaped steel is pressed into the ground.
As an improvement of the invention, step (2) is to weld a triangular plate on the exposed H-shaped steel and at the elevation of the steel pipe support bottom, and then to install the steel pipe support.
The invention has the beneficial effects that:
1) the problems that the top plate and the bottom plate of the buried section are large in thickness and difficult to open holes and the integrity of the main body structure is damaged are effectively solved, and meanwhile, the cost of opening the holes is saved;
2) the single line production is converted into the parallel construction of a plurality of sections, so that the demolition efficiency is greatly improved, the construction period is shortened, and the influence period on surrounding buildings is shortened;
3) the H-shaped steel is implanted to replace a cast-in-place pile, a lattice column and double rows of Larsen steel sheet piles to replace the SMW construction method piles, so that the construction period is saved, the cost is reduced, and the environmental pollution caused by the construction of the cast-in-place piles and the construction method piles is avoided;
4) according to the height of the open section and the size of the reserved slope, different dismantling methods are adopted, and safe and quick dismantling work is guaranteed.
Drawings
FIG. 1 is a plan view of Larsen steel sheet pile;
FIG. 2 is a cross-sectional view of a Larsen steel sheet pile;
FIG. 3 is a larsen steel sheet pile connection thumbnail;
FIG. 4 is a Larsen steel sheet pile connection construction drawing;
FIG. 5 is a schematic view of 6m slotting of a bent frame of a buried section at the north side;
FIG. 6 is an implantation view of a north buried section of H-section steel;
FIG. 7 is a construction drawing showing the implantation of H-shaped steel, the installation of a triangular plate, and the erection of a steel pipe support at a north buried section;
FIG. 8 is a construction drawing of slotting, mounting and supporting 6m of a bent of a buried section at the north side;
FIG. 9 is a schematic view of a bottom plate slot of a bent frame at a north side open section;
FIG. 10 is a schematic view of a north open section bent support installation;
fig. 11 is a schematic view of the final shelving floor slotting.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in the figure, the innovative process for tunnel demolition provided by the invention comprises the following two construction parts:
1. open segment of south side
Because the south side open section is shallow and the construction space is large, the original SMW construction method pile enclosure structure on the south side of the tunnel is changed into a Larsen steel sheet pile enclosure structure, meanwhile, the lateral support in the pit is replaced by a mode of soil removal on the outer side of the enclosure structure, the vertical column pile construction process is omitted, the arrangement frequency of the dewatering well is determined according to the actual water level observation condition, and therefore the process optimization and the construction period shortening are achieved.
1) And the enclosing structures on east and west sides of the south side K9+851-K9+906 of the tunnel are in the form of Larsen steel sheet piles (shown in figures 1 and 2), and the model of the Larsen steel sheet piles is SP-U400 x 170. Two rows are arranged on each side of K9+851-K9+876, the distance between two steel sheet piles is 3.5m, the height of one top close to the side wall is +3.6m, the height of the bottom is-11.5 m, the height of the other top is +3.6m, and the height of the bottom is-8.5 m. K9+876-K9+906 are arranged close to the side wall, the top elevation is +3.6m, and the bottom elevation is-11.5 m.
2) The single row of Larsen steel sheet piles are connected into a whole through 28b channel steel, and the two rows of steel sheet piles are connected through 20 counter-pulling screw rods at a distance of 1.6 m. The corbels are made of 16mm steel plates, the size is 20cm x 30cm, and the spacing is 2 m. As shown in fig. 3 and 4.
3) In order to ensure the stability of the sloping surface, the sloping surface is treated by adopting a net hanging and guniting mode, and a 50@1500PVC pipe water outlet is arranged.
4) And (4) omitting the vertical column pile and the transverse support construction, and directly cutting and dismantling the original tunnel concrete of the open section.
2. North side buried segment
According to the original scheme, the upright piles need to be constructed firstly, and the main structure of the tunnel can be disassembled after the supporting and installation are finished. Because original tunnel roof, bottom plate thickness are 1.1m, and 20cm bottom plate bed course in addition to the mode construction stand pile of trompil is more difficult, need simultaneously at roof and bottom plate trompil, stand pile footpath 0.8m, and trompil inverted trapezoid upper shed area is about 10m2. According to this mode trompil, it is inevitable to cause the destruction to tunnel major structure, and the rig has very big potential safety hazard in the operation of roof top, if in the operation of bottom plate top, the clear height of tunnel does not have the condition of in-hole construction.
After multiple times of design, checking calculation and communication, the tunnel is finally dismantled by using a part of original tunnel frame structure as a concrete support, and the concrete construction method comprises the following steps:
a: concealed buried section 1# -5# bent frame
1) According to the figure 5, the 1# bent, the 2# bent, the 3# bent, the 4# bent and the 5# bent are sequentially subjected to annular slotting operation, wherein the annular slotting operation comprises a top plate, side walls, a middle wall and a bottom plate, and the slotting width is 6 m;
2) reserving a 3-4m concrete frame between the two grooves as a support;
3) before grooving, carrying out force transmission reinforced concrete slab supporting construction between a ring beam and a tunnel top plate in a rib planting mode, wherein the plate is 300mm thick, the width is the same as 3-4m (the width is the same as the width of a reserved section), the reinforcing bars are double-layer bidirectional ∯ 14@200, and the concrete strength grade is C30;
4) removing concrete blocks within the range of 6m broken sections, implanting H-shaped steel with the length of 15m and the size of 700 x 300 at the pile position by a pile implanting machine to replace lattice columns, and ensuring that the rest parts of the exposed height of the H-shaped steel are pressed into the ground, wherein 2 transverse rows of frames are arranged; as shown in fig. 6;
5) welding triangular plates on the exposed H-shaped steel and at the bottom elevation of the steel pipe support, and then installing the steel pipe support; as shown in fig. 7;
6) after the support is installed, axial force is applied, and then the 1# -5# bent 3-4m wide concrete frame can be dismantled. As shown in fig. 8.
b: open section 7# -12# bent (leaving 6# bent temporarily)
1) Constructing from 12# to 7# bent;
2) slotting the bottom plate according to the principle that the pile position is transversely expanded by 2m and longitudinally expanded by 1m respectively; as shown in fig. 9;
3) replacing lattice columns with H-shaped steel with the length of 15m and the size of 700 x 300 at the pile positions by a pile planting machine, and ensuring that the rest parts of the exposed height of the H-shaped steel are pressed into the ground by 2 transverse rows of the same 1# -5# bent;
4) welding triangular plates on the exposed H-shaped steel and at the bottom elevation of the steel pipe support, and then installing the steel support;
5) and after the support is installed, applying axial force, and then carrying out the dismounting work of the No. 7-12 bent concrete side wall and the bottom plate. As shown in fig. 10;
c, hidden buried section 6# bent
1) Because the original 6# bent pile is positioned in the supporting range of the 3m wide concrete frame, the 6# bent pile position needs to be readjusted to ensure the stability of the foundation pit;
2) after the supports of the No. 5 and No. 7 bent frames are installed, the dividing line of the open section and the buried section is grooved towards the south 6m, and concrete of a top plate, a middle wall, a side wall and a bottom plate is cut off, as shown in fig. 11; (ii) a
3) Implanting 6# bent H-shaped steel according to the pile position shown in the figure, installing a steel support, applying axial force and dismantling a 3m concrete frame;
the invention effectively solves the problems of large thickness of the top plate and the bottom plate of the buried section, difficult hole opening and damage to the structural integrity of the main body, and saves the cost of hole opening; the construction of a plurality of sections in parallel greatly improves the demolition efficiency, shortens the construction period and shortens the period of influence on surrounding buildings; the H-shaped steel is adopted to replace cast-in-place piles, lattice columns and double rows of Larsen steel sheet piles to replace the SMW construction method piles, so that the construction period is saved, the cost is reduced, and the environmental pollution caused by the construction of the cast-in-place piles and the construction method piles is avoided; the invention also tests the water stopping effect of the double-row Larsen steel sheet piles in the diving stratum of the Yangtze river flood beach area; and selecting a double-row Larsen steel sheet pile deformation calculation model, and analyzing the correctness of the calculation model by comparing theoretical data with actual data.
By means of the innovative dismantling process, direct and indirect cost is saved by about 310 ten thousand yuan, the construction period is about 2 months, the tunnel dismantling work is smoothly completed before the flood season comes, meanwhile, through scientific calculation and reasonable arrangement, the dismantling process is safe and feasible, and reference can be provided for similar projects.
Comparing the cost of original scheme with that of optimized scheme
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (6)
1. A tunnel demolishing innovative process is characterized in that: construction is carried out in two parts:
1) open section of south side: the pile enclosure structure of the original SMW construction method is changed into a Larsen steel sheet pile enclosure structure, meanwhile, the transverse support in a pit is replaced by a mode of soil withdrawal outside the enclosure structure, the arrangement frequency of a dewatering well is determined according to the actual water level observation condition,
2) north buried section + open section:
a: performing annular grooving operation on a bent frame of a buried section of a tunnel at the north side from inside to outside, wherein the bent frame comprises a top plate, side walls, a middle wall and a bottom plate, the bent frame is divided into an annular concrete structure with the interval of 6m and the width of 3-4m, a 3-4m concrete frame between two grooves is reserved as a support, H-shaped steel is implanted in a 6m dismantling area to replace a lattice column, a transverse steel pipe support is installed, and the 3-4m concrete frame is broken and removed after the transverse steel pipe support is installed;
b: keeping 1 bent frame at the boundary of the open section and the buried section immovably, keeping a concrete frame as a middle support, and performing bottom plate slotting by transversely expanding the bent frame of the open section of the north tunnel by 2m from outside to inside according to the pile position and longitudinally expanding each 1 m; implanting H-shaped steel to replace lattice columns at the pile positions, installing transverse steel pipe supports, and dismantling the side walls and the bottom plate of the bent concrete after installation;
c: after the steel pipe supports of the open section and the buried section on the north side are installed, a slot is formed in the south 6m of the boundary of the open section and the buried section, concrete of a top plate, a middle wall, a side wall and a bottom plate is cut off, H-shaped steel is implanted into a pile position, the steel pipe supports are installed, axial force is applied, and the last 3-4m concrete frame is dismantled.
2. An innovative process of tunnel demolition as claimed in claim 1, characterized in that: and (2) arranging two rows of Larsen steel sheet piles at two sides of the road, wherein the distance between every two adjacent Larsen steel sheet piles is 1.6 m.
3. An innovative process of tunnel demolition as claimed in claim 2, characterized in that: and (2) connecting the two rows of Larsen steel plate piles at a distance of 3.5m through 20 counter-pulling screws, wherein the corbels are made of 16mm steel plates, the size is 20cm x 30cm, and the distance is 2 m.
4. An innovative process of tunnel demolition as claimed in claim 1, characterized in that: and (2) treating the slope surface in a net hanging and guniting mode in the construction of the open section in the step (1), and arranging a 50@1500PVC pipe drain hole to ensure the stability of the slope surface.
5. An innovative process of tunnel demolition as claimed in claim 1, characterized in that: and (3) in the step (2), the length of the H-shaped steel is 15m, the size is 700 x 300, and 2 transverse frames are arranged in each bent frame, so that the rest part of the exposed height of the H-shaped steel is pressed into the ground.
6. An innovative process of tunnel demolition as claimed in claim 1, characterized in that: and (2) welding triangular plates on the exposed H-shaped steel and at the elevation of the steel pipe support bottom, and then installing the steel pipe support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010767104.0A CN111946396B (en) | 2020-08-03 | 2020-08-03 | Innovative tunnel dismantling process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010767104.0A CN111946396B (en) | 2020-08-03 | 2020-08-03 | Innovative tunnel dismantling process |
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| CN111946396A true CN111946396A (en) | 2020-11-17 |
| CN111946396B CN111946396B (en) | 2022-04-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102521A (en) * | 2010-12-29 | 2011-06-22 | 上海浦东工程建设管理有限公司 | Method for broadening and rebuilding soft soil shallow tunnel in operation state |
| CN105545323A (en) * | 2015-12-07 | 2016-05-04 | 中交第二航务工程局有限公司 | Construction method for open cut tunnel lining |
| CN106761770A (en) * | 2016-11-22 | 2017-05-31 | 中建五局土木工程有限公司 | Bored tunnel stress system two times transfer construction method |
| CN108533284A (en) * | 2018-02-01 | 2018-09-14 | 中铁十二局集团有限公司 | A kind of tunnel cross-section just builds construction technology |
| CN108842819A (en) * | 2018-09-07 | 2018-11-20 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of urban track traffic cable run method for tunnel construction |
-
2020
- 2020-08-03 CN CN202010767104.0A patent/CN111946396B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102521A (en) * | 2010-12-29 | 2011-06-22 | 上海浦东工程建设管理有限公司 | Method for broadening and rebuilding soft soil shallow tunnel in operation state |
| CN105545323A (en) * | 2015-12-07 | 2016-05-04 | 中交第二航务工程局有限公司 | Construction method for open cut tunnel lining |
| CN106761770A (en) * | 2016-11-22 | 2017-05-31 | 中建五局土木工程有限公司 | Bored tunnel stress system two times transfer construction method |
| CN108533284A (en) * | 2018-02-01 | 2018-09-14 | 中铁十二局集团有限公司 | A kind of tunnel cross-section just builds construction technology |
| CN108842819A (en) * | 2018-09-07 | 2018-11-20 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of urban track traffic cable run method for tunnel construction |
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| CN111946396B (en) | 2022-04-29 |
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