CN110685710A - Secondary lining construction method and system for intersection of main tunnel and double-layer construction transverse channel - Google Patents
Secondary lining construction method and system for intersection of main tunnel and double-layer construction transverse channel Download PDFInfo
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- CN110685710A CN110685710A CN201911060052.7A CN201911060052A CN110685710A CN 110685710 A CN110685710 A CN 110685710A CN 201911060052 A CN201911060052 A CN 201911060052A CN 110685710 A CN110685710 A CN 110685710A
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- 238000010276 construction Methods 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000011449 brick Substances 0.000 claims description 121
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 239000002689 soil Substances 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 230000008569 process Effects 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 241001270131 Agaricus moelleri Species 0.000 description 23
- 238000009415 formwork Methods 0.000 description 20
- 239000010410 layer Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000004381 surface treatment Methods 0.000 description 6
- 239000011469 building brick Substances 0.000 description 4
- 239000004746 geotextile Substances 0.000 description 4
- 238000004078 waterproofing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- 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
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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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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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
- E21D11/152—Laggings made of grids or nettings
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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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- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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Abstract
The invention discloses a double-lining construction method and a system for the intersection of a main tunnel and a double-layer construction transverse channel, wherein only part of temporary inverted arches of the construction transverse channel (within the clearance influence range of the double lining of the main tunnel) need to be removed, and the temporary inverted arches of the construction transverse channel between a left line tunnel door and a right line tunnel door of the main tunnel do not need to be removed; concrete is saved; an external mold and a part of internal molds (the internal molds are supported when the contour lines of the two liners of the bottom plate of the positive line tunnel are backfilled) are not required to be supported; the vault and the side wall are not required to be waterproof, and additionally added internal and external corners are not required to be laid on the vault of the construction transverse channel, so that the waterproof construction difficulty is effectively reduced; obviously reduces the process conversion and improves the construction efficiency.
Description
Technical Field
The invention relates to the field of underground engineering, in particular to a secondary lining construction method and a secondary lining construction system for the intersection of a main tunnel and a double-layer construction transverse channel.
Background
In the construction process of urban subway and mine method tunnels, due to the limitation of geographical conditions and construction conditions, a method of constructing a construction transverse channel first and then constructing a positive line double-line (left line and right line) tunnel from the construction transverse channel to two sides is generally adopted, and construction is carried out according to the method, so that a 'double cross' cross type is formed at the intersection of the positive line double-line (left line and right line) tunnel and the construction transverse channel. The construction cross passage is usually a vault straight wall double-layer pilot tunnel and is additionally provided with a temporary inverted arch structure (the construction cross passage is usually only used as a primary support structure), and the main tunnel is usually a standard horseshoe-shaped structure (the main tunnel comprises a primary support structure and a secondary lining).
The conventional construction method for the secondary lining of the main tunnel has many defects, such as:
1. all temporary inverted arches of the construction transverse channel need to be dismantled, and time and labor are wasted;
2. the vacant places outside the contour lines of the two main lines of the main line are backfilled, so that a large amount of high-grade concrete is wasted;
3. unnecessary templates are erected for multiple times (two internal templates and two external templates are additionally arranged), and time, labor and materials are wasted;
4. because the construction transverse channel is of a vault straight wall structure and the main tunnel is of a standard horseshoe-shaped structure, additional internal and external corners and an arc vault of the transverse channel are generated at the construction transverse channel, so that the vault and the side wall are difficult to waterproof, time-consuming, labor-consuming and material-consuming;
5. construction processes are changed for many times, so that construction machines move in and out of the field for many times, unnecessary machine shifts (such as vehicle-mounted ground pumps for concrete pouring) are generated for many times, and construction cost and construction period are increased. Therefore, it is necessary to develop a more scientific, time-saving, material-saving and labor-saving novel construction method.
Disclosure of Invention
The invention mainly aims at the defects of the prior art and provides a more scientific two-lining construction method and a more scientific two-lining construction system for the intersection of a main tunnel and a double-layer construction transverse channel, which save time, labor and materials.
The technical scheme adopted by the invention is as follows:
a secondary lining construction method for the intersection of a main tunnel and a double-layer construction transverse channel comprises the following steps:
breaking temporary inverted arches of construction transverse channels at the left tunnel and the right tunnel;
building a right line brick wall on the left side of the right line tunnel to the position at or above the elevation of the arch crown of the right line tunnel;
constructing a second lining of the right tunnel, only erecting a second lining inner template when erecting the template, synchronously pouring a second lining structure and a vacant space between the second lining structure and the construction transverse channel primary support structure as well as the right brick wall by using second lining concrete, and forming a flat top structure at the vault position of the right tunnel;
a hole is formed in a temporary inverted arch of a construction transverse channel between a left tunnel and a right tunnel, a blanking pipe is arranged in the hole, a grouting floral pipe is installed in the blanking pipe, and a bottom support of the temporary inverted arch is erected in a lower pilot tunnel;
building a lower guide hole brick wall in a lower guide hole on the right side of the left tunnel, backfilling the lower guide hole with rammed earth while building the brick wall, stopping backfilling the rammed earth to a certain height, mounting a grouting pattern pipe at the top of the lower guide hole and communicating with the grouting pattern pipe in the lower pipe, and building the lower guide hole brick wall to be closely attached to the temporary inverted arch;
building an upper guide hole brick wall in an upper guide hole on the right side of the left line tunnel, backfilling the upper guide hole with rammed plain soil while building the brick wall, and stopping when the backfilling of the rammed plain soil and the building of the brick wall of the upper guide hole are carried out to the top position of the brick wall of the right line tunnel;
the left line brick wall is built on the left side of the left line tunnel and stops when reaching the top position of the upper pilot tunnel brick wall;
constructing a second lining of the left-line tunnel, only erecting a second lining inner template when erecting the template, synchronously pouring a second lining structure and vacant spaces among the second lining structure, the primary support structure and brick walls on two sides by using second lining concrete, and forming a flat top structure at the vault position of the left-line tunnel;
installing an upper pilot tunnel grouting floral tube at the top of an upper pilot tunnel and communicating with the grouting floral tube in the blanking tube, then building the right brick wall, the upper pilot tunnel brick wall and the left brick wall until the right brick wall, the upper pilot tunnel brick wall and the left brick wall are closely attached to the vault of a construction transverse channel, reserving concrete pouring holes in the right brick wall, and reserving concrete pouring holes and access holes in the upper pilot tunnel brick wall and the left brick wall;
backfilling vacant spaces above the flat top structure of the right-line tunnel, above the tamping plain soil of the lower guide tunnel, above the tamping plain soil of the upper guide tunnel and above the flat top structure of the left-line tunnel by using plain concrete through the reserved concrete pouring holes;
and after the backfilled plain concrete reaches a certain strength, grouting and compacting through the reserved grouting floral tubes.
In some embodiments of the construction method of the present invention, the step of constructing the second lining of the right tunnel comprises:
treating the second lining base surface of the bottom plate of the right tunnel;
waterproof laying of a second lining of a bottom plate of the right-side tunnel, and reserving a trunk for connecting a vault and a second lining of a side wall of the right-side tunnel to be waterproof;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the bottom plate and a vacant space between the second lining and a primary support structure by using second lining concrete during pouring the concrete;
treating the second lining base surfaces of the vault and the side wall of the right tunnel;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the vault and the side wall and a vacant space between the second lining and the primary support structure by using second lining concrete during pouring the concrete;
and the arch crown and the side wall of the right tunnel are laid in a waterproof mode and are connected with the racking branches in a waterproof reserved mode through the two linings of the bottom plate.
In some embodiments of the construction method of the present invention, the step of constructing the secondary lining of the left tunnel comprises:
treating the second lining base surface of the bottom plate of the left tunnel;
the second lining of the bottom plate of the left-line tunnel is laid in a waterproof manner, and a throwing joint is reserved for connecting the vault and the second lining of the side wall of the right-line tunnel in a waterproof manner;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the bottom plate and a vacant space between the second lining and the brick walls on the two sides by using second lining concrete during pouring the concrete;
treating the second lining base surfaces of the vault and the side wall of the left tunnel;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring second lining concrete into the vault and the side walls and the vacant spaces between the second lining concrete and the brick walls on the two sides during pouring the concrete;
and the arch crown and the side wall of the left-line tunnel are laid in a waterproof mode and are connected with the racking branches in a waterproof reserved mode through the two linings of the bottom plate.
In some embodiments of the construction method of the present invention, before the steel bars are bound, a steel bar bent is pre-arranged at the bottom to compensate for a height difference between the secondary lining steel bars and the primary support structure of the construction cross channel.
In some embodiments of the construction method, C15 plain concrete is used for backfilling the vacant spaces at the top of the right-line tunnel flat-top structure, the top of the lower-guide-hole tamping plain soil, the top of the upper-guide-hole tamping plain soil and the top of the left-line tunnel flat-top structure, and the backfilling height is 1.5 m.
In some embodiments of the construction method of the present invention, the bottom support of the temporary inverted arch is made of i-steel.
In some embodiments of the construction method of the present invention, the upper end of the i-beam is welded to the embedded steel plate on the bottom surface of the temporary inverted arch, and the lower end of the i-beam is welded to the embedded steel plate on the upper surface of the primary bottom support structure.
In some embodiments of the construction method of the present invention, the access hole and the concrete pouring hole are filled after use.
In some embodiments of the construction method of the present invention, a plurality of the blanking pipes are distributed at a certain interval at a middle position of the temporary inverted arch.
A two lining construction system of intersection of a main tunnel and a double-layer construction transverse passage comprises:
the right line brick wall is built on the left side of the right line tunnel;
the first flat top structure is formed in an empty space between the right tunnel secondary lining and a construction transverse channel primary support structure and between the right tunnel secondary lining and the right brick wall, and plain concrete is back filled above the first flat top structure;
the lower pilot tunnel brick wall is built in a lower pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and tamping plain soil and plain concrete are sequentially and back-filled in the lower pilot tunnel from bottom to top;
the upper pilot tunnel brick wall is built in an upper pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and tamping plain soil and plain concrete are sequentially backfilled in the upper pilot tunnel from bottom to top;
the left line brick wall is built on the left side of the left line tunnel;
the second flat top structure is formed in an empty space between the second left tunnel lining and a primary support structure of a construction transverse channel and brick walls on two sides, and plain concrete is back filled above the second flat top structure;
the upper pilot tunnel and the lower pilot tunnel are provided with a disassembly-free temporary inverted arch of a construction transverse channel, the bottom support of the temporary inverted arch is erected in the lower pilot tunnel, a discharging pipe is installed in the upper hole and the hole of the temporary inverted arch, a grouting floral tube is fixed in the discharging pipe, the top of the upper pilot tunnel and the top of the lower pilot tunnel are provided with the grouting floral tube and communicated with the grouting floral tube in the discharging pipe, and an upper pipe opening of the discharging pipe is located on the upper surface of the tamping plain soil backfilled in the upper pilot tunnel.
The invention adopts the technical scheme and has the beneficial effects that:
(1) only part of the temporary inverted arches of the construction transverse channel (within the clearance influence range of the secondary lining of the positive tunnel) need to be removed, and the temporary inverted arches of the construction transverse channel between the left and right tunnel doors of the positive tunnel do not need to be removed;
(2) saving about 30% of high-grade concrete (obtained by specific calculation);
(3) an external mold and a part of internal molds (the internal molds are supported when the contour lines of the two liners of the bottom plate of the positive line tunnel are backfilled) are not required to be supported;
(4) the vault and the side wall are not required to be waterproof, and additionally added internal and external corners are not required to be laid on the vault of the construction transverse channel, so that the waterproof construction difficulty is effectively reduced;
(5) obviously reduces the process conversion and improves the construction efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a second lining construction method at the intersection of a main tunnel and a double-deck construction cross passage according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the whole body in the longitudinal direction of the construction cross passage after the completion of the construction according to the method of the present invention.
FIG. 3 is a longitudinal sectional view of a vertical tunnel formed along a transverse direction of a transverse passage after completion of construction according to the method of the present invention.
FIG. 4 is a longitudinal section of a construction cross passage along a transverse direction of the construction cross passage after completion of construction according to the method of the present invention
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The construction cross passage is usually a vault straight wall double-layer pilot tunnel and is additionally provided with a temporary inverted arch structure (the construction cross passage is usually only used as a primary support structure), and the main tunnel is usually a standard horseshoe-shaped structure (the main tunnel comprises a primary support structure and a secondary lining).
Aiming at the secondary lining of the main tunnel, the traditional construction method comprises the following steps: firstly, breaking a temporary inverted arch in the range of a right tunnel (close to a construction transverse passage end-sealed wall); building brick walls from bottom to top along the construction transverse channel structure on the left side of the right tunnel (the brick walls are symmetrical to the construction transverse channel end sealing wall along the middle line of the right tunnel, and are directly built to the top of the transverse channel from bottom to top, and concrete pouring holes are reserved at the top of the transverse channel); processing the base surface of the second lining of the right tunnel bottom plate, constructing a waterproof (geotextile, a plastic waterproof plate and a protective layer) of the second lining of the right tunnel bottom plate after the base surface is processed, and backfilling the vacant space between the second lining of the right tunnel bottom plate and the brick wall and the primary support structure of the transverse channel by using plain concrete with the same label as the second lining of the positive tunnel (an inner template needs to be supported in the step); then, sequentially constructing a second lining of the bottom plate of the right tunnel (steel bar binding → formwork erecting (inner formwork) → concrete pouring → formwork stripping and concrete curing); sequentially constructing a right tunnel vault and a second lining of a side wall (base surface treatment → waterproof laying (geotextile and plastic waterproof board) → reinforcement → formwork support (inner formwork and outer formwork) → concrete pouring → formwork removal and concrete curing); after the second lining concrete of the vault and the side wall reaches a certain strength, the vacant spaces between the vault and the second lining of the side wall and the brick wall and the primary support structure of the transverse channel are backfilled with the same-grade plain concrete of the second lining of the positive tunnel; then, breaking a temporary inverted arch of a construction transverse channel between the left and right tunnel doors and in the influence range of the left tunnel, building the same brick wall close to the right side of the left tunnel, and backfilling earthwork between the left and right tunnels by using plain soil (the brick wall position is symmetrical to the brick wall position on the left side of the right tunnel along the center line between the left and right tunnel doors, the brick wall is not directly built to the top, the brick wall is required to be synchronous with the height of a backfilled earthwork during building, the backfilled earthwork is backfilled while tamped until the position 1.5m away from the arch crown of the transverse channel is stopped, at the moment, the brick wall is built to the top of the transverse channel, a concrete pouring hole is reserved at the top position, and the remaining 1.5m empty space of the arch part of the transverse channel between the two brick walls is backfilled by using C15 plain concrete through the reserved concrete pouring hole; finally, building brick walls on the left side of the left tunnel (the brick walls are 50cm in thickness and are symmetrical to the brick walls on the right side of the left tunnel along the center line of the left tunnel, and are directly built to the top of the cross channel from bottom to top along the construction cross channel structure, and concrete pouring holes are reserved at the top of the cross channel; processing the base surface of the second lining of the bottom plate of the left-line tunnel, constructing waterproof (geotextile, plastic waterproof board and protective layer) of the second lining of the bottom plate of the left-line tunnel after the base surface is processed, and then backfilling the vacant places among the second lining of the bottom plate of the left-line tunnel, brick walls at two sides and a primary support structure of a transverse passage by using plain concrete with the same label as the second lining of the right-line tunnel (an inner template needs to be erected in the step); sequentially constructing a second lining of a bottom plate of the left-line tunnel (steel bar binding → formwork support (inner formwork) → concrete pouring → form removal and concrete curing), and sequentially constructing a second lining of a vault and a side wall of the left-line tunnel (base surface treatment → waterproof laying (geotextile + plastic waterproof board) → steel bar binding → formwork support (inner formwork and outer formwork) → concrete pouring → form removal and concrete curing); and after the second linings of the vault and the side wall reach certain strength, backfilling the vacant places between the vault and the second linings of the side wall and the two brick walls and the primary support structure of the transverse channel by using the same-grade plain concrete of the second linings of the front line tunnel and the left line tunnel through the reserved concrete pouring holes.
As can be seen from the specific construction process of the conventional construction method, the conventional method has many disadvantages, such as: 1. all temporary inverted arches of the construction transverse channel need to be dismantled, and time and labor are wasted; 2. the vacant places outside the contour lines of the two main lines of the main line are backfilled, so that a large amount of high-grade concrete is wasted; 3. unnecessary templates are erected for multiple times (two internal templates and two external templates are additionally arranged), and time, labor and materials are wasted; 4. because the construction transverse channel is of a vault straight wall structure and the main tunnel is of a standard horseshoe-shaped structure, additional internal and external corners and an arc vault of the transverse channel are generated at the construction transverse channel, so that the vault and the side wall are difficult to waterproof, time-consuming, labor-consuming and material-consuming; 5. construction processes are changed for many times, so that construction machines move in and out of the field for many times, unnecessary machine shifts (such as vehicle-mounted ground pumps for concrete pouring) are generated for many times, and construction cost and construction period are increased. Therefore, it is necessary to develop a more scientific, time-saving, material-saving and labor-saving novel construction method.
The invention provides a more scientific construction method which saves time, labor and materials. Compared with the traditional construction method, the invention has the following obvious changes: (1) only part of the temporary inverted arches of the construction transverse channel (within the clearance influence range of the secondary lining of the positive tunnel) need to be removed, and the temporary inverted arches of the construction transverse channel between the left and right tunnel doors of the positive tunnel do not need to be removed; (2) saving about 30% of high-grade concrete (obtained by specific calculation); (3) an external mold and a part of internal molds (the internal molds are supported when the contour lines of the two liners of the bottom plate of the positive line tunnel are backfilled) are not required to be supported; (4) the vault and the side wall are not required to be waterproof, and additionally added internal and external corners are not required to be laid on the vault of the construction transverse channel, so that the waterproof construction difficulty is effectively reduced; (5) obviously reduces the process conversion and improves the construction efficiency (for example, the traditional method needs to pour concrete for 9 times, and the method only needs to pour concrete for 5 times).
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1 to 4, an embodiment of the present invention provides a secondary lining construction method at a crossing of a main tunnel and a double-layer construction transverse passage, which mainly includes the following steps:
step S1: breaking the temporary inverted arches 10 of the construction transverse channels at the left tunnel and the right tunnel;
step S2: building a right brick wall 11 on the left side of the right tunnel to the position at and above the arch crown elevation of the right tunnel;
step S3: constructing a second lining 30 of the right tunnel, only erecting a second lining inner template when erecting the template, synchronously pouring a second lining structure and a vacant space between the second lining structure and the construction transverse channel primary support structure 20 as well as the right line brick wall 11 by using second lining concrete, and forming a flat top structure A1 at the vault position of the right tunnel;
step S4: a hole is formed in a temporary inverted arch 10' of a construction transverse channel between a left tunnel and a right tunnel, a blanking pipe 14 is arranged in the hole, a grouting flower pipe 18 is arranged in the blanking pipe 14, and a bottom support of the temporary inverted arch is erected in a lower pilot tunnel; the bottom support of the temporary inverted arch is made of I-shaped steel 14, the upper end of the I-shaped steel 14 is welded to the embedded steel plate on the bottom surface of the temporary inverted arch 10', and the lower end of the I-shaped steel 14 is welded to the embedded steel plate on the upper surface of the primary bottom support structure 20.
Step S5: building a lower pilot tunnel brick wall 15 in a lower pilot tunnel on the right side of the left tunnel, backfilling the lower pilot tunnel by rammed earth 150 while building the brick wall, stopping backfilling the rammed earth to a certain height, mounting a grouting perforated pipe 18 at the top of the lower pilot tunnel and communicating with the grouting perforated pipe 18 in the blanking pipe 13, and building the lower pilot tunnel brick wall until the lower pilot tunnel brick wall is closely attached to the temporary inverted arch 10';
step S6: building an upper guide hole brick wall 16 in an upper guide hole on the right side of the left line tunnel, backfilling the upper guide hole with rammed earth 150 while building the brick wall, and stopping when the backfilling of the rammed earth 150 and the building of the upper guide hole brick wall 16 are carried out to the top position of the right line brick wall 11;
step S7: when a left line brick wall 17 is built on the left side of the left line tunnel to the top of the upper guide tunnel brick wall 16, stopping building;
step S8: constructing a left line tunnel secondary lining 40, only erecting a secondary lining inner template when erecting the template, synchronously pouring a secondary lining structure and the vacant spaces among the secondary lining structure, the primary support structure 20 and the brick walls at two sides by using secondary lining concrete, and forming a flat top structure B1 at the arch top position of the left line tunnel;
step S9: installing an upper pilot hole grouting perforated pipe 18 at the top of the upper pilot hole and communicating the upper pilot hole grouting perforated pipe 18 with a grouting perforated pipe 18 in the blanking pipe, then building a right brick wall 11, an upper pilot hole brick wall 16 and a left brick wall 17 until the upper pilot hole brick wall is closely attached to the vault of the construction transverse channel, reserving a concrete pouring hole 50 in the right brick wall 11, and reserving a concrete pouring hole 50 and an access hole (the access hole and the concrete pouring hole are filled after the use) in the upper pilot hole brick wall 16 and the left brick wall 17;
step S10: backfilling vacant spaces above a right-line tunnel flat-top structure A1, above lower pilot tunnel tamping plain soil 150, above upper pilot tunnel tamping plain soil 150 and above a left-line tunnel flat-top structure C1 with plain concrete 100 through the reserved concrete pouring holes 50;
step S11: and grouting and compacting through the reserved grouting floral tubes 18 after the backfilled plain concrete 100 reaches a certain strength.
By adopting the construction method of the embodiment, the construction system of the joint of the main tunnel and the double-layer pilot tunnel construction transverse channel of the embodiment of the invention can be obtained, which mainly comprises the following steps:
the right line brick wall 11 is built on the left side of the right line tunnel;
the right tunnel secondary lining 30 and the first flat top structure A1 are integrally cast, the first flat top structure A1 is formed in an empty space between the right tunnel secondary lining 30 and the construction cross channel primary support structure 20 and the right brick wall 11, and plain concrete 100 is back filled above the first flat top structure A1;
the lower pilot tunnel brick wall 15 is built in a lower pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and tamping plain soil 150 and plain concrete 100 are sequentially and back-filled in the lower pilot tunnel from bottom to top;
an upper pilot tunnel brick wall 16 which is built in an upper pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and rammed plain soil 150 and plain concrete 100 are sequentially backfilled in the upper pilot tunnel from bottom to top;
a left line brick wall 17 built on the left side of the left line tunnel;
the left tunnel secondary lining 40 and the second flat roof structure B1 are integrally cast, the second flat roof structure B1 is formed in the vacant space between the left tunnel secondary lining 40 and the construction transverse channel primary support structure 20 and between the left brick wall 17, the lower guide tunnel brick wall 15 and the upper guide tunnel brick wall 16 on the two sides, and plain concrete 100 is back filled above the second flat roof structure B1.
The upper guide hole and the lower guide hole are provided with a temporary inverted arch 10 ' of a construction transverse channel disassembly-free section, a bottom support (I-steel 14) of the temporary inverted arch 10 ' is erected in the lower guide hole, a discharging pipe 13 is installed in a hole formed in the temporary inverted arch 10 ' and the hole, a grouting flower pipe 18 is fixed in the discharging pipe 13, the top of the upper guide hole and the top of the lower guide hole are provided with the grouting flower pipe 18 and are communicated with the grouting flower pipe 18 in the discharging pipe 13, and an upper pipe opening of the discharging pipe 13 is located on the upper surface of ramming plain soil 150 backfilled in the upper guide hole.
The following description of a specific operation procedure when the construction method of the above embodiment is applied with reference to fig. 2 to 4 is as follows:
firstly, breaking temporary inverted arches of a construction transverse channel within the influence range of a left lining and a right lining of a main tunnel, transporting broken dregs outwards, and building brick walls from bottom to top along the construction transverse channel on the left side of the right tunnel (building till 1.5m away from the top of the transverse channel and stopping); sequentially constructing a second lining of a bottom plate of the right tunnel (base surface treatment → waterproof laying (all waterproof reservations of the second linings of the arch crown and the side wall are thrown in the joint) → steel bar binding → formwork erection (inner formwork) → concrete pouring → form removal and concrete curing), and sequentially constructing the second lining of the arch crown and the side wall of the right tunnel (base surface treatment → steel bar binding → formwork erection (inner formwork) → concrete pouring → waterproof laying); two round holes are formed in the middle of a temporary inverted arch of a construction transverse channel between the tunnel doors of the left and right tunnels, a blanking pipe is arranged at the formed holes, grouting perforated pipes are welded and fixed on the inner side wall of the blanking pipe, and I-shaped steel supports are erected in a guide hole under the construction transverse channel; building a brick wall (the brick wall of the lower guide hole on the right side of the left line) and backfilling the lower guide hole of the construction transverse channel at the position with rammed plain soil, stopping backfilling the rammed plain soil until the distance between the rammed plain soil and the temporary inverted arch is 1.5m, then installing a fixed lower guide hole grouting perforated pipe close to the top of the temporary inverted arch, and building the brick wall to be closely attached to the temporary inverted arch after the grouting perforated pipe is installed; then building brick walls (brick walls with guide holes on the right side of the left line) and backfilling the guide holes on the construction cross channel with rammed plain soil (the rammed plain soil is backfilled to 1.5m away from the vault of the cross channel, and the brick walls are built to 1.5m away from the vault of the cross channel; then building a left brick wall of the left tunnel (stopping when building 1.5m away from the top of the cross passage); sequentially constructing a second lining of the bottom plate of the left-line tunnel (base surface treatment → waterproof laying (all waterproof reservations of the second linings of the arch crown and the side wall are thrown in the raft) → reinforcement → formwork erection (inner formwork) → concrete pouring), and sequentially constructing a second lining of the arch crown and the side wall of the left-line tunnel (base surface treatment → reinforcement → formwork erection (inner formwork) → concrete pouring → waterproof laying); then, installing and fixing an upper pilot tunnel grouting perforated pipe close to the primary support structure surface at the arch top of the upper pilot tunnel, building the three brick walls to be closely attached to the arch top of the cross passage after the installation of the upper pilot tunnel grouting perforated pipe is finished, reserving a concrete pouring hole on the right brick wall, reserving a pouring hole on the left brick wall and two brick walls on the left brick wall and an access hole for a single person to enter and exit to install and disassemble a pump pipe (all the holes are filled after all the holes are used), and then sequentially backfilling the vacant places between the right line flat top and the primary support of the cross passage, the vacant places between the tunnel portal door of the front line (left and right) and the primary support of the cross passage (upper and lower pilot tunnels), and the vacant places between the left line flat top and the primary support of the cross passage by C15 plain concrete through the reserved concrete pouring holes in a retreat; and after the backfilled C15 plain concrete reaches a certain strength, filling the gap generated by the untight backfilled C15 plain concrete by grouting the grout through the grouting floral tubes.
The invention provides a more scientific construction method which saves time, labor and materials. Compared with the traditional construction method, the invention has the following obvious changes: (1) only part of the temporary inverted arches of the construction transverse channel (within the clearance influence range of the secondary lining of the positive tunnel) need to be removed, and the temporary inverted arches of the construction transverse channel between the left and right tunnel doors of the positive tunnel do not need to be removed; (2) saving about 30% of high-grade concrete (obtained by specific calculation); (3) an external mold and a part of internal molds (the internal molds are supported when the contour lines of the two liners of the bottom plate of the positive line tunnel are backfilled) are not required to be supported; (4) the vault and the side wall are not required to be waterproof, and additionally added internal and external corners are not required to be laid on the vault of the construction transverse channel, so that the waterproof construction difficulty is effectively reduced; (5) obviously reduces the process conversion and improves the construction efficiency (for example, the traditional method needs to pour concrete for 9 times, and the method only needs to pour concrete for 5 times).
The construction method provided by the invention realizes the change (1) by adopting the following measures: before backfilling earthwork of a lower pilot tunnel of a construction transverse channel between a left line tunnel door and a right line tunnel door, a plurality of I-shaped steels (steel plates welded at two ends of the I-shaped steels) are additionally arranged on the lower pilot tunnel of the construction transverse channel (between a temporary inverted arch and an inverted arch), the connection mode is that the steel plates welded at two ends of the I-shaped steels are welded with the temporary inverted arch and an inverted arch embedded steel plate (the steel plates are embedded at corresponding positions when the temporary inverted arch and the inverted arch of a primary support structure of the transverse channel are constructed), the I-shaped steels are arranged between the temporary inverted arch and the inverted arch, and the I-shaped steels are used for supporting the temporary inverted arch to enable the temporary inverted arch to have enough bearing; before backfilling earthwork of a pilot tunnel on a construction transverse channel between a left line hole door and a right line hole door, arranging a plurality of round holes (with the diameter of 200mm) at the middle position on a temporary inverted arch, arranging a blanking pipe (a steel pipe with the diameter of 200mm) at the hole-opening position, arranging a bell mouth at the top of the blanking pipe, arranging a fixing guard ring at the intersection position of the blanking pipe and the temporary inverted arch, communicating an upper pilot tunnel and a lower pilot tunnel of the construction transverse channel by the blanking pipe, and enabling concrete to smoothly flow into the lower pilot tunnel from the pilot tunnel on the construction transverse channel when C15 plain concrete is backfilled; grouting perforated pipes are arranged at the top of the upper pilot tunnel and the top of the lower pilot tunnel of the construction transverse channel between the left line tunnel door and the right line tunnel door and are ensured to be communicated up and down (the grouting perforated pipes penetrate through the discharging pipes), and the grouting perforated pipes are used for filling gaps generated by non-compact backfill and pouring of C15 plain concrete by grouting the perforated pipes with cement paste.
The construction method provided by the invention realizes the changes (2), (3), (4) and (5) by adopting the following measures: before binding the two-lining steel bars of the bottom plate of the main tunnel, a steel bar bent frame with proper size is required to be processed (the two-lining steel bar of the bottom plate of the main tunnel and the primary inverted arch of the construction transverse channel have height difference) to support a steel bar framework of the two-lining steel bar of the bottom plate of the main tunnel, after binding the steel bars, the two-lining steel bar of the bottom plate of the main tunnel and the empty space between the two-lining steel bar of the bottom plate of the main tunnel and the primary structure of the brick wall and the transverse channel are poured with concrete (the two-lining concrete of the main tunnel required by; when the second lining of the bottom plate of the main tunnel is constructed, the water resistance is carried out according to the normal procedure: waterproof → reinforcing steel → template → concrete, but when constructing the arch crown and the side wall secondary lining of the main tunnel, the construction method provided by the invention adopts certain measures to put the waterproof to the end: steel bar → template → concrete → water proofing (so change need to throw out all the water proofing of vault and side wall two linings (leave enough length of throwing racking) when applying the water proofing of the two linings of the bottom plate of the main tunnel, and roll it up to fix it well so that it does not affect the site operation); when the three-side brick wall to be built is built for the first time, building the three-side brick wall to a position 1.5m away from the vault of the construction cross channel (at the moment, the brick wall is slightly higher than the highest position of the vault of the two linings of the main tunnel), only erecting an inner template when the vault of the main tunnel and the two linings of the side walls are constructed, pouring concrete to be flush with the top of the brick wall (at the moment, the outer sides of the vault of the main tunnel and the two linings of the side walls are of a flat top structure), and after the concrete reaches certain strength, welding and externally wrapping all reserved waterproof when a bottom plate is constructed to; and after the flat top and the water proofing are finished, the three brick walls are completely built until the brick walls are closely attached to the vault of the transverse channel, and then the left part between the flat top of the right-line tunnel and the brick wall and the primary support of the transverse channel, the left part between the hole door of the left-right line tunnel and the brick wall and the primary support of the transverse channel, and the left part between the flat top of the left-line tunnel and the brick wall and the primary support of the transverse channel are sequentially poured in a retreating mode.
The construction method provided by the invention has the advantages of time saving, labor saving, material saving, construction cost reduction, construction difficulty reduction, safety, reliability and the like, effectively solves a series of problems of double lining construction at the double-cross intersection of the main tunnel and the construction transverse channel and backfill of the construction transverse channel, greatly improves the construction efficiency, and has very high practical value and popularization value.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A secondary lining construction method for the intersection of a main tunnel and a double-layer construction transverse channel is characterized by comprising the following steps:
breaking temporary inverted arches of construction transverse channels at the left tunnel and the right tunnel;
building a right line brick wall on the left side of the right line tunnel to the position at or above the elevation of the arch crown of the right line tunnel;
constructing a second lining of the right tunnel, only erecting a second lining inner template when erecting the template, synchronously pouring a second lining structure and a vacant space between the second lining structure and the construction transverse channel primary support structure as well as the right brick wall by using second lining concrete, and forming a flat top structure at the vault position of the right tunnel;
a hole is formed in a temporary inverted arch of a construction transverse channel between a left tunnel and a right tunnel, a blanking pipe is arranged in the hole, a grouting floral pipe is installed in the blanking pipe, and a bottom support of the temporary inverted arch is erected in a lower pilot tunnel;
building a lower guide hole brick wall in a lower guide hole on the right side of the left tunnel, backfilling the lower guide hole with rammed earth while building the brick wall, stopping backfilling the rammed earth to a certain height, mounting a grouting pattern pipe at the top of the lower guide hole and communicating with the grouting pattern pipe in the lower pipe, and building the lower guide hole brick wall to be closely attached to the temporary inverted arch;
building an upper guide hole brick wall in an upper guide hole on the right side of the left line tunnel, backfilling the upper guide hole with rammed plain soil while building the brick wall, and stopping when the backfilling of the rammed plain soil and the building of the brick wall of the upper guide hole are carried out to the top position of the brick wall of the right line tunnel;
the left line brick wall is built on the left side of the left line tunnel and stops when reaching the top position of the upper pilot tunnel brick wall;
constructing a second lining of the left-line tunnel, only erecting a second lining inner template when erecting the template, synchronously pouring a second lining structure and vacant spaces among the second lining structure, the primary support structure and brick walls on two sides by using second lining concrete, and forming a flat top structure at the vault position of the left-line tunnel;
installing an upper pilot tunnel grouting floral tube at the top of an upper pilot tunnel and communicating with the grouting floral tube in the blanking tube, then building the right brick wall, the upper pilot tunnel brick wall and the left brick wall until the right brick wall, the upper pilot tunnel brick wall and the left brick wall are closely attached to the vault of a construction transverse channel, reserving concrete pouring holes in the right brick wall, and reserving concrete pouring holes and access holes in the upper pilot tunnel brick wall and the left brick wall;
backfilling vacant spaces above the flat top structure of the right-line tunnel, above the tamping plain soil of the lower guide tunnel, above the tamping plain soil of the upper guide tunnel and above the flat top structure of the left-line tunnel by using plain concrete through the reserved concrete pouring holes;
and after the backfilled plain concrete reaches a certain strength, grouting and compacting through the reserved grouting floral tubes.
2. The double-lining construction method at the intersection of the main tunnel and the double-layer construction cross passage according to claim 1, wherein the step of constructing the right tunnel double lining comprises the steps of:
treating the second lining base surface of the bottom plate of the right tunnel;
waterproof laying of a second lining of a bottom plate of the right-side tunnel, and reserving a trunk for connecting a vault and a second lining of a side wall of the right-side tunnel to be waterproof;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the bottom plate and a vacant space between the second lining and a primary support structure by using second lining concrete during pouring the concrete;
treating the second lining base surfaces of the vault and the side wall of the right tunnel;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the vault and the side wall and a vacant space between the second lining and the primary support structure by using second lining concrete during pouring the concrete;
and the arch crown and the side wall of the right tunnel are laid in a waterproof mode and are connected with the racking branches in a waterproof reserved mode through the two linings of the bottom plate.
3. The double-lining construction method at the intersection of the main tunnel and the double-layer construction cross passage according to claim 1, wherein the step of constructing the left tunnel double lining comprises the steps of:
treating the second lining base surface of the bottom plate of the left tunnel;
the second lining of the bottom plate of the left-line tunnel is laid in a waterproof manner, and a throwing joint is reserved for connecting the vault and the second lining of the side wall of the right-line tunnel in a waterproof manner;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring a second lining of the bottom plate and a vacant space between the second lining and the brick walls on the two sides by using second lining concrete during pouring the concrete;
treating the second lining base surfaces of the vault and the side wall of the left tunnel;
binding reinforcing steel bars, erecting an inner template and pouring concrete, and synchronously pouring second lining concrete into the vault and the side walls and the vacant spaces between the second lining concrete and the brick walls on the two sides during pouring the concrete;
and the arch crown and the side wall of the left-line tunnel are laid in a waterproof mode and are connected with the racking branches in a waterproof reserved mode through the two linings of the bottom plate.
4. The method for constructing the secondary lining at the intersection of the main tunnel and the double-layer construction cross channel as claimed in claim 3, wherein a steel bar bent is pre-arranged at the bottom to compensate the height difference between the secondary lining steel bars and the primary support structure of the construction cross channel before the steel bars are bound.
5. The secondary lining construction method at the intersection of the main tunnel and the double-layer construction cross passage as claimed in claim 1, wherein the empty spaces at the top of the right-line tunnel flat top structure, the top of the lower pilot tunnel rammed earth, the top of the upper pilot tunnel rammed earth and the top of the left-line tunnel flat top structure are backfilled with C15 plain concrete, and the backfilling height is 1.5 m.
6. The secondary lining construction method at the intersection of the main tunnel and the double-layer construction transverse channel according to claim 1, wherein the bottom support of the temporary inverted arch is made of I-steel.
7. The secondary lining construction method for the intersection of the main tunnel and the double-deck transverse passage for construction according to claim 6, wherein the upper end of the i-steel is welded to the embedded steel plate on the bottom surface of the temporary inverted arch, and the lower end of the i-steel is welded to the embedded steel plate on the upper surface of the primary support structure at the bottom.
8. The secondary lining construction method at the intersection of the main tunnel and the double-deck construction cross passage according to claim 1, wherein the access hole and the concrete pouring hole are completed after use.
9. The secondary lining construction method at the intersection of the main tunnel and the double-deck construction cross passage as claimed in claim 1, wherein a plurality of the down pipes are distributed at a certain interval at the middle position of the temporary inverted arch.
10. The utility model provides a two lining construction systems of positive line tunnel and double-deck construction cross passage intersection which characterized in that includes:
the right line brick wall is built on the left side of the right line tunnel;
the first flat top structure is formed in an empty space between the right tunnel secondary lining and a construction transverse channel primary support structure and between the right tunnel secondary lining and the right brick wall, and plain concrete is back filled above the first flat top structure;
the lower pilot tunnel brick wall is built in a lower pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and tamping plain soil and plain concrete are sequentially and back-filled in the lower pilot tunnel from bottom to top;
the upper pilot tunnel brick wall is built in an upper pilot tunnel of a construction transverse channel on the right side of the left-line tunnel, and tamping plain soil and plain concrete are sequentially backfilled in the upper pilot tunnel from bottom to top;
the left line brick wall is built on the left side of the left line tunnel;
the second flat top structure is formed in an empty space between the second left tunnel lining and a primary support structure of a construction transverse channel and brick walls on two sides, and plain concrete is back filled above the second flat top structure;
the upper pilot tunnel and the lower pilot tunnel are provided with a disassembly-free temporary inverted arch of a construction transverse channel, the bottom support of the temporary inverted arch is erected in the lower pilot tunnel, a discharging pipe is installed in the upper hole and the hole of the temporary inverted arch, a grouting floral tube is fixed in the discharging pipe, the top of the upper pilot tunnel and the top of the lower pilot tunnel are provided with the grouting floral tube and communicated with the grouting floral tube in the discharging pipe, and an upper pipe opening of the discharging pipe is located on the upper surface of the tamping plain soil backfilled in the upper pilot tunnel.
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