CN111219200A - Buckling-restrained assembled tunnel combined structure supporting system and construction method thereof - Google Patents
Buckling-restrained assembled tunnel combined structure supporting system and construction method thereof Download PDFInfo
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- CN111219200A CN111219200A CN202010193282.7A CN202010193282A CN111219200A CN 111219200 A CN111219200 A CN 111219200A CN 202010193282 A CN202010193282 A CN 202010193282A CN 111219200 A CN111219200 A CN 111219200A
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 42
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 44
- 239000004567 concrete Substances 0.000 claims abstract description 38
- 239000011178 precast concrete Substances 0.000 claims abstract description 28
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 40
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009417 prefabrication Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 239000011435 rock Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011378 shotcrete Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 101150097977 arch-1 gene Proteins 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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Abstract
The invention discloses a buckling-restrained assembled tunnel composite structure supporting system and a construction method thereof, wherein the supporting system comprises a buckling-restrained combined arch centering, in-pipe concrete and a precast concrete lining, a reinforced corner plate and a fixing bolt are additionally arranged on the buckling-restrained combined arch centering, the precast concrete lining comprises a vault lining, an arch shoulder lining, an arch foot lining and an arch bottom lining, corner plate mounting seams are respectively arranged on four parts of the linings, bolt holes are reserved at the end parts of the four parts of the linings, and bulges among the arch centering are arranged on the outer edge surface; the positions of the bolt holes are matched with the positions of the fixing bolts, the positions of the angle plate mounting seams are matched with the positions of the reinforced angle plates, and the bulges among the arch frames are used for filling gaps of adjacent buckling-restrained combined arch frames; according to the invention, the precast concrete lining is adopted, and the installation of the precast concrete lining can be carried out after 2 adjacent buckling-restrained combined arches are installed, and the manufacturing precision and the installation speed of the precast concrete lining can be ensured and improved due to the adoption of factory prefabrication, and meanwhile, the operating environment in the tunnel is improved.
Description
Technical Field
The invention belongs to the technical field of tunnel supporting structures, and particularly relates to a buckling-restrained assembled tunnel combined structure supporting system and a construction method thereof.
Background
At present, the conditions of arch center distortion and damage and sprayed concrete cracking occur in the construction process of loess tunnels, so that the underground chambers deform and invade the boundary, and even engineering disasters such as collapse occur. The primary support structure form that loess tunnel was used commonly at present stage is shaped steel bow member and shotcrete, however the unstable problem of structure often takes place, and light then local buckling, heavy then whole buckling becomes "the twist form". Particularly for the tunnel with longitudinal bias condition, the out-of-plane instability phenomenon of the arch often occurs, which leads to buckling failure of the structure, and is caused by the bending rigidity with large difference of the strength axis and the weakness axis of the steel arch. Therefore, the buckling restrained design of the reinforced tunnel structure is particularly important for resisting buckling damage.
In addition, the mechanization and assembly degree in the current domestic tunnel construction process is still insufficient, the working strength of constructors is high, the conditions of large dust and low visibility also exist in the operation environment conditions in the tunnel, and particularly during the concrete spraying operation, the health of the constructors is threatened, and the construction precision of a supporting structure cannot be ensured. Moreover, considering the factor of the resilience of the sprayed concrete, the time required for the final effective strength formation of the primary support is long, and the primary support is difficult to adapt to poor geological conditions. Therefore, it is imperative to advance tunnel-lining fabricated concrete.
Disclosure of Invention
The invention aims to provide a buckling-restrained assembled tunnel combined structure supporting system and a construction method thereof, which solve the problem of buckling damage of an arch frame structure, and improve the tunnel construction efficiency and construction precision by adopting prefabricated assembled lining.
The invention is realized by the following technical scheme:
a buckling-restrained assembled tunnel combined structure supporting system comprises a plurality of buckling-restrained combined arches which are closely arranged, wherein each buckling-restrained combined arch comprises a wing plate, a core pipe, a reinforcing angle plate and a fixing bolt; the core pipe is arranged on the inner side of the wing plate, and the reinforcing angle plate and the fixing bolt are arranged on two sides of the core pipe;
concrete in the pipe is poured into the core pipe, and a precast concrete lining is arranged between the adjacent anti-buckling combined arch frames;
the precast concrete lining comprises four parts: the method comprises the following steps of vault lining, arch shoulder lining, arch foot lining and arch bottom lining, wherein corner plate mounting seams are formed in the four parts of lining, and bolt holes are reserved in the end parts of the four parts of lining;
the positions of the bolt holes are matched with the positions of the fixing bolts, and the positions of the angle plate mounting seams are matched with the positions of the reinforcing angle plates;
the buckling-restrained combined arch center is provided with grouting holes.
Further, in the longitudinal direction, an installation gap is reserved between the adjacent wing plates, arch center bulges are preset on the outer edge surfaces of the four parts of lining, and the arch center bulges are used for filling the gap of the adjacent anti-buckling combined arch center.
Furthermore, each anti-buckling combined arch center is divided into an arch crown support, an arch shoulder support, an arch foot support and an arch bottom support along the annular direction;
the arch crown support and the arch bottom support are oppositely arranged, the arch shoulder support is symmetrically arranged at two ends of the arch crown support, the arch foot support is symmetrically arranged at two ends of the arch bottom support, and the arch crown support and the arch shoulder support, the arch shoulder support and the arch foot support and the arch bottom support are connected in a socket joint mode.
Furthermore, both ends of the arch-roof lining are positioned between the adjacent arch-roof supports, the upper end of the arch-shoulder lining is positioned between the adjacent arch-roof supports, the lower end of the arch-shoulder lining is positioned between the adjacent arch-shoulder supports, the upper end of the arch-foot lining is positioned between the adjacent arch-shoulder supports, the lower end of the arch-foot lining is positioned between the adjacent arch-foot supports, and both ends of the arch-foot lining are positioned between the adjacent arch-foot supports.
Further, the vault support comprises a vault wing plate and a vault core pipe, and the vault core pipe is fixed on the inner side of the vault wing plate; the arch crown core pipe is characterized in that a plurality of reinforcing angle plates and two groups of fixing bolts are arranged on the arch crown wing plate, and the reinforcing angle plates and the fixing bolts are symmetrically arranged on two sides of the arch crown core pipe;
the arch shoulder support comprises an arch waist wing plate and an arch waist core tube, and the arch waist core tube is fixed on the inner side of the arch waist wing plate; the arch waist wing plate is provided with a plurality of reinforcing angle plates and a group of fixing bolts, and the reinforcing angle plates and the fixing bolts are symmetrically arranged on two sides of the arch waist core tube;
the arch springing bracket comprises an arch springing wing plate and an arch springing core tube, and the arch springing core tube is fixed on the inner side of the arch springing wing plate; the arch foot wing plate is provided with a plurality of reinforcing angle plates and a group of fixing bolts, and the reinforcing angle plates and the fixing bolts are symmetrically arranged on two sides of the arch foot core tube;
the arch bottom support comprises an arch bottom wing plate and an arch bottom core tube, the arch bottom core tube is fixed on the inner side of the arch bottom wing plate, a plurality of reinforcing angle plates are arranged on the arch bottom wing plate, and the reinforcing angle plates are symmetrically arranged on two sides of the arch bottom core tube.
Further, vault core tube and hunch waist core tube, hunch waist core tube and hunch foot core tube all pass through pipe bellmouth and pipe socket hoop connection with hunch end core tube.
Furthermore, pipe bellmouths are adopted at two ends of the vault core pipe; one end of the arch waist core tube and one end of the arch foot core tube adopt tube bell mouths, and the other end of the arch waist core tube and the arch foot core tube adopt tube sockets; the two ends of the arch bottom core tube adopt tube sockets.
Furthermore, grouting holes are preset on the arch springing core tube; the arch top wing plate is provided with an exhaust hole in advance.
The invention also discloses a construction method of the buckling-restrained assembled tunnel combined structure supporting system, which comprises the following steps:
1) after the soil body is excavated, closely arranging a plurality of buckling-restrained combined arch frames in the excavation direction and installing the buckling-restrained combined arch frames in the chamber;
2) grouting through the grouting holes to finish the pouring of concrete in the pipe;
3) the prefabricated concrete lining is installed between every two adjacent anti-buckling combined arches, and the method specifically comprises the following steps:
3.1, installing arch bottom lining: aligning a bolt hole of the arch bottom lining with a fixing bolt of 2 adjacent arch foot supports, aligning an angle plate mounting seam with a reinforced angle plate, and then mounting to finish the mounting of the arch bottom lining;
3.2, installing an arch springing lining: aligning bolt holes at the lower part of the arch springing lining with fixing bolts of 2 adjacent arch springing supports, aligning bolt holes at the upper part of the arch springing lining with fixing bolts of 2 adjacent arch shoulder supports, aligning an angle plate mounting seam with a reinforced angle plate, and then mounting to finish the mounting of the arch springing lining;
3.3, installing an arch shoulder lining: aligning bolt holes at the lower part of the arch shoulder lining with fixing bolts of 2 adjacent arch shoulder supports, aligning bolt holes at the upper part of the arch shoulder lining with fixing bolts of 2 adjacent arch support, aligning an angle plate mounting seam with a reinforced angle plate, and then mounting to finish the mounting of the arch shoulder lining;
3.4 installing a vault lining: and (3) performing waterproof treatment on the building joint and the convex surface between the arch frames, aligning the bolt holes with the fixing bolts of 2 adjacent arch support frames, and simultaneously aligning the corner plate mounting joint with the reinforcing corner plate for mounting to finish the mounting of the arch lining.
Furthermore, each anti-buckling combined arch center is divided into an arch crown support, an arch shoulder support, an arch foot support and an arch bottom support along the annular direction;
in the step 1), the installation steps of the anti-buckling combined arch center are as follows:
1.1, firstly installing a vault support at the top of the chamber to finish the installation of the vault support;
1.2, connecting an arch shoulder support to each of two ends of the arch crown support to complete the installation of the arch shoulder supports;
1.3, connecting an arch springing bracket at the lower end of each arch shoulder bracket to complete the installation of the arch springing bracket;
1.4, connecting an arch bottom bracket between the two arch foot brackets to complete the installation of the arch bottom bracket;
1.5 repeating the steps 1.1-1.4 to finish the next anti-buckling combined arch center.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a buckling-restrained assembled tunnel combined structure supporting system which comprises three parts, namely a buckling-restrained combined arch frame, in-pipe concrete and precast concrete lining; the buckling-restrained combined arch center is used as a first-step supporting structure, wing plates on two sides with larger coverage area are tightly attached to surrounding rocks, the local stability of the wing plates is improved through the rib forming effect of the reinforced corner plates, the bearing capacity is enhanced, and the wing plates are prevented from being subjected to 'wavy' and 'folded-to-folded' yield deformation. Compared with the prior arch structure, the buckling-restrained design can effectively reduce the local buckling of the wing plate and protect the excavated space from loss; the buckling-restrained combined arch centering comprises wing plates, a core pipe, reinforcing angle plates and fixing bolts, and concrete in the pipe is poured into the core pipe, so that the buckling-restrained combined arch centering and the concrete in the pipe form a combined supporting structure, and the supporting capability is further enhanced; and the prefabricated concrete lining is adopted to fill the space between the arch frames, and the prefabricated concrete lining, the buckling-restrained combined arch frame and the concrete in the pipe form a complete primary supporting structure. Compared with the prior cast concrete, the invention adopts the precast concrete lining, and the installation of the precast concrete lining can be carried out after the installation of 2 adjacent buckling-restrained combined arch frames is finished; the angle plate mounting joints and the bolt holes are formed in the precast concrete lining, the corresponding reinforcing angle plates and the bolts are arranged on the buckling-restrained combined arch centering, the reinforcing angle plates can be clamped into the angle plate mounting joints, the bolts are just inserted into the bolt holes, after improvement, the combined arch centering and the precast concrete lining are higher in connection strength, and the problem of block-by-block assembling of the precast lining is effectively solved. The installation of the buckling-restrained arch frame, the pouring of concrete in the pipe and the assembly of the prefabricated lining are processes for forming a complete supporting system and for continuously enhancing the supporting capability. According to dynamic monitoring of a construction site, procedures of pouring concrete in the pipe and assembling the prefabricated lining can be flexibly adjusted, and for a section with poor geological conditions, lining assembly can be completed firstly, and then a plurality of arch frames are used for pouring the concrete in the pipe in a centralized mode.
Furthermore, during field construction, the wing plates of adjacent buckling-restrained combined arches are difficult to be tightly connected together in the longitudinal direction, so that installation gaps are reserved for the wing plates of the adjacent arches, and the protrusions between the arches are correspondingly reserved on the precast concrete lining and are used for filling the gaps between the arches.
Further, the common step method construction of the large-section loess tunnel ensures construction safety by reducing the excavation section, the arch center of the combined structure is divided into four parts, namely an arch crown support, an arch waist support, an arch foot support and an arch bottom support, the four parts are connected in a subsection mode, the arch center can be matched with the construction method of the tunnel after being segmented, and meanwhile, the arch center is convenient to transport into the tunnel in the subsection mode.
Furthermore, the buckling-restrained combined arch centering and the precast concrete lining are assembled in a staggered joint mode, the arch centering connecting joints and the lining connecting joints are not located at the same position, the weak surface staggering is mainly considered, the stress is better, and the tunnel waterproof requirement is considered.
Furthermore, the supports are connected through the pipe bell mouths and the pipe sockets without extra bolts and nuts, so that the installation is simpler and more convenient, the circumferential connection among the supports is realized, and the tightness of the structural connection of the whole supporting system is ensured.
Furthermore, grouting holes are preset on the arch springing core tube, concrete is poured from bottom to top, and the arch springing core tube is compacted through the self-weight action of grout to prevent the arch springing core tube from being empty; the exhaust holes are prefabricated in the core tube of the vault, so that redundant air and scum in the core tube can be discharged during grouting operation, and the grouting operation quality is guaranteed.
The construction method of the buckling-restrained assembled tunnel combined structure supporting system disclosed by the invention comprises the steps of firstly installing the buckling-restrained combined arch centering, immediately sealing and exposing surrounding rock after the buckling-restrained combined arch centering is erected, providing supporting counterforce, preventing a wing plate from generating local yield deformation, protecting lining installation clearance, and quickly propelling a tunnel face and quickly looping; then pouring concrete into the core pipe to form a steel pipe concrete framework structure, so that the support strength of the arch frame can be further and rapidly improved, the active reinforcement can better adapt to the characteristic that the pressure of the loess tunnel surrounding rock gradually increases, and the structure safety and the support storage are ensured; and finally, a precast concrete lining is arranged between every two adjacent anti-buckling combined arches, and because the arches form a ring, the arch has supporting capacity, and considering that the weight of the lining is large, the construction of falling the bottom first is safer. In addition, as the precast concrete lining is precast in a factory, the process flow is simplified, and the construction progress is accelerated, so that the manufacturing precision and the installation speed of the precast concrete lining can be guaranteed and improved, and the operation environment in the tunnel is improved.
Drawings
FIG. 1 is a schematic structural view of a buckling restrained assembled tunnel composite structure supporting system of the invention;
FIG. 2 is a schematic structural view of a buckling restrained assembled arch;
FIG. 3 is a schematic view of a precast concrete lining structure;
FIG. 4 is a lining arch assembly view;
FIG. 5 is a schematic view of a dome mount;
FIG. 6 is a schematic view of a spandrel support;
FIG. 7 is a schematic view of an arch support;
FIG. 8 is a schematic view of the under arch support;
FIG. 9 is a schematic illustration of a dome lining;
FIG. 10 is a schematic illustration of a spandrel lining;
FIG. 11 is a schematic illustration of the arch lining;
fig. 12 is a schematic view of an arch underlay.
Wherein, 1 is a buckling-restrained combined arch center, 1-1 is an arch crown support, 1-2 is an arch shoulder support, 1-3 is an arch foot support, 1-4 is an arch bottom support, 2-1 is in-pipe concrete, 2-2 is a precast concrete lining, 2-2-1 is an arch crown lining, 2-2-2 is an arch shoulder lining, 2-2-3 is an arch foot lining, 2-2-4 is an arch bottom lining, 3 is a wing plate, 3-1 is an arch crown wing plate, 3-2 is an arch shoulder wing plate, 3-3 is an arch foot wing plate, 3-4 is an arch bottom wing plate, 4 is a core pipe, 4-1 is an arch crown core pipe, 4-2 is an arch shoulder pipe, 4-3 is an arch foot pipe, 4-4 is an arch bottom core pipe, 5 is a reinforced angle plate, and 6 is a pipe bell mouth, 7 is a pipe socket, 8 is a fixing bolt, 9 is a bolt hole, 10 is an angle plate mounting seam, 11 is an exhaust hole, 12 is a grouting hole, 13 is a lining seam, and 14 is an arch center bulge.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in figure 1, the buckling-restrained assembled tunnel combined structure supporting system comprises three parts, namely a buckling-restrained combined arch center 1, in-pipe concrete 2-1 and precast concrete linings 2-2. The buckling-restrained combined arch center 1 comprises wing plates 3, a core pipe 4, a reinforced angle plate 5 and a fixing bolt 8; the core tube 4 is arranged on the inner side of the wing plate 3, and the reinforcing angle plate 5 and the fixing bolt 8 are arranged on two sides of the core tube 4; the core pipe 4 is filled with concrete 2-1 in the pipe, and precast concrete linings 2-2 are arranged between the adjacent anti-buckling combined arch frames 1.
The anti-bending combined arch 1 is used as an arch bearing part. The buckling-restrained combined arch frame is adopted to immediately seal the excavation space, a first-layer supporting structure of a supporting system is formed, surrounding rock load generated by excavation is borne, the local buckling deformation resistance of the wing plate is enhanced, and lining installation clearance is protected.
And (3) pouring the in-pipe concrete 2-1 into the core pipe 4, so that the buckling-restrained combined arch center 1 and the in-pipe concrete 2-1 form a combined supporting structure, and the supporting capability is further enhanced. The concrete filled steel tube skeleton structure formed by pouring concrete into the core tube further improves the supporting strength of the arch frame rapidly, the active reinforcement can better adapt to the characteristic that the loess tunnel surrounding rock pressure gradually increases, and the structure safety and the supporting storage are guaranteed.
And (3) filling the space between the arches by adopting precast concrete linings 2-2, and forming a complete primary supporting structure together with the anti-buckling combined arch 1 and the in-pipe concrete 2-1.
As shown in figure 2, the anti-buckling combined arch center 1 is divided into an arch top support 1-1, an arch shoulder support 1-2, an arch foot support 1-3 and an arch bottom support 1-4, and adjacent supports are connected in a socket joint mode. The joint of adjacent arches needs to be subjected to waterproof treatment before safety so as to ensure that no water leakage exists in the tunnel.
Specifically, a vault bracket 1-1 and an arch bottom bracket 1-4 are oppositely arranged, an arch waist bracket 1-2 is symmetrically arranged at two ends of the vault bracket 1-1, an arch foot bracket 1-3 is symmetrically arranged at two ends of the arch bottom bracket 1-4, one end of the arch waist bracket 1-2 is connected with the vault bracket 1-1, the other end is connected with one end of the arch foot bracket 1-3, and the other end of the arch foot bracket 1-3 is connected with the arch bottom bracket 1-4; the annular connections of the arch crown support 1-1, the arch waist support 1-2, the arch foot support 1-3 and the arch bottom support 1-4 are all connected in a socket joint mode through a pipe bell mouth 6 and a pipe spigot 7.
As shown in figure 3, the precast concrete lining 2-2 is divided into a vault lining 2-2-1, an arch shoulder lining 2-2-2, an arch foot lining 2-2-3 and an arch bottom lining 2-2-4, corner plate mounting seams 10 are arranged on each lining, bolt holes 9 are reserved at the end parts of the corner plate mounting seams, and arch center bulges 14 are arranged on the outer edge surface of the corner plate mounting seams.
The arch lining 2-2-1, the arch shoulder lining 2-2-2, the arch foot lining 2-2-3 and the arch bottom lining 2-2-4 are connected with corresponding arch centering through fixing bolts 8 and bolt holes 9, wherein the lining joint 13 and the arch center bulge 14 need to be subjected to waterproof treatment on the surfaces before installation.
As shown in fig. 4, the buckling restrained combined arch centering 1 and the precast concrete lining 2-2 are assembled in a staggered joint mode. The two ends of each arch crown lining 2-2-1 are located between the adjacent arch crown supports 1-1, the upper ends of the arch shoulder linings 2-2-2 are located between the adjacent arch crown supports 1-1, the lower ends of the arch shoulder linings 2-2-2 are located between the adjacent arch shoulder supports 1-2, the upper ends of the arch foot linings 2-2-3 are located between the adjacent arch shoulder supports 1-2, the lower ends of the arch foot linings 2-2-3 are located between the adjacent arch foot supports 1-3, and the two ends of each arch bottom lining 2-2-4 are located between the adjacent arch foot supports 1-3.
As shown in fig. 5, the vault support 1-1 comprises a vault wing plate 3-1, a vault core tube 4-1, a reinforcing angle plate 5 and a fixing bolt 8, wherein the vault core tube 4-1 is fixed on the inner side of the vault wing plate 3-1, the reinforcing angle plate 5 and the fixing bolt 8 are arranged on two sides of the vault core tube 4-1, and the annular connecting parts of the vault support 1-1 are all pipe sockets 6. The top of the vault support 1-1 is provided with a prefabricated exhaust hole 11, so that redundant air and scum in the core pipe are exhausted during grouting operation, and the grouting operation quality is ensured.
As shown in fig. 6, the spandrel support 1-2 comprises a spandrel wing plate 3-2, a spandrel core tube 4-2, a reinforcing angle plate 5 and a fixing bolt 8, the spandrel core tube 4-2 is fixed on the inner side of the spandrel wing plate 3-2, the reinforcing angle plate 5 and the fixing bolt 8 are both arranged on two sides of the spandrel core tube 4-2, wherein the upper part of the spandrel core tube 4-2 in circumferential connection is a tube socket 7, and the lower part of the spandrel core tube is a tube socket 6.
As shown in fig. 7, the arch foot support 1-3 comprises an arch foot wing plate 3-3, an arch foot core tube 4-3, a reinforcing angle plate 5 and a fixing bolt 8, wherein the arch foot core tube 4-3 is fixed on the inner side of the arch foot wing plate 3-3, the reinforcing angle plate 5 and the fixing bolt 8 are arranged on two sides of the arch foot core tube 4-3, the upper part of the circumferential connection of the arch foot core tube 4-3 is a tube socket 7, and the lower part of the circumferential connection is a tube socket 6. The side of the arch center core tube 4-3 is provided with a prefabricated grouting hole 12, and grouting operation is performed through the grouting hole 12 after the arch center core tube is closed into a ring, so that the concrete 2-1 in the tube is poured.
As shown in fig. 8, the arch bottom support 1-4 comprises an arch bottom wing plate 3-4, an arch bottom core tube 4-4 and a reinforcing angle plate 5, the arch bottom core tube 4-4 is fixed on the inner side of the arch bottom wing plate 3-4, the reinforcing angle plate 5 and a fixing bolt 8 are arranged on two sides of the arch bottom core tube 4-4, the circumferential connecting parts of the arch bottom core tube 4-4 are all tube inserting openings 7, and the arch bottom support 1-4 is not provided with the fixing bolt 8 due to the adoption of staggered assembly.
The buckling-restrained combined arch center 1 can reduce the risk of instability and damage of the arch center, particularly can effectively improve the buckling-restrained capacity of a wing plate, can seal and expose surrounding rocks after erecting the arch center, immediately provides higher supporting strength in a contact surface, enables the surrounding rocks to be in a favorable environment with three-dimensional stress, and protects the self-supporting capacity of the surrounding rocks. According to the supporting concept of 'strong primary support', the initial concrete lining is formed by matching the buckling-restrained arch center and arranging the mounting component and adopting an assembling and mounting mode. Compared with the existing supporting system, the rigidity and the strength of the primary support are enhanced, and due to the fact that the concrete curing time is reduced, the supporting effect can be immediately achieved after assembly, the active effect on reducing the expansion of the plastic zone of the surrounding rock and the generation of the loosening load is achieved, from the perspective of overall design, the thickness of the two linings can be reduced, and the construction cost is reduced.
As shown in FIG. 9, the surface of the vault lining 2-2-1 is prefabricated with bolt holes 9, corner plate installation seams 10 and arch center bulges 14, wherein the bolt holes 9 are connected with the bolt holes on the vault lining 2-2-2, the corner plate installation seams 10 are the same as the positions of reinforced corner plates 5 of the vault support, and the reinforced corner plates 5 can be clamped into the corner plate installation seams 10.
As shown in FIG. 10, bolt holes 9, corner plate installation slits 10 and inter-arch protrusions 14 are prefabricated on the surface of the shoulder lining 2-2-2, wherein the bolt holes 9 on the upper portion are connected with the bolt holes 9 of the dome lining 2-2-1, the bolt holes 9 on the lower portion are connected with the bolt holes 9 of the arch foot lining 2-2-3, and the corner plate installation slits 10 are positioned in the same positions as the reinforcing corner plates 5 of the shoulder brackets 1-2.
As shown in FIG. 11, the surface of the arch foot lining 2-2-3 is prefabricated with bolt holes 9, corner plate attachment seams 10 and inter-arch frame bulges 14, wherein the bolt holes 9 at the upper part are connected with the bolt holes 9 of the arch shoulder lining 2-2-2, the bolt holes 9 at the lower part are connected with the bolt holes 9 of the arch bottom lining 2-2-4, and the corner plate attachment seams 10 are positioned in the same positions as the reinforced corner plates 5 of the arch foot support 1-3.
As shown in FIG. 12, the surface of the arch bottom lining 2-2-4 is prefabricated with bolt holes 9, corner plate attachment seams 10 and inter-arch frame bulges 14, wherein the bolt holes 9 are connected with the bolt holes 9 of the arch foot lining 2-2-3, and the corner plate attachment seams 10 are positioned at the same positions as the reinforced corner plates 5 of the arch bottom bracket 1-4.
The construction process of the buckling-restrained assembled tunnel combined structure supporting system specifically comprises the following steps:
1) after the soil body is excavated, firstly, a vault support 1-1 is installed on the top of the chamber, and the installation of the vault support 1-1 is completed.
2) And respectively carrying out waterproof treatment on seams at two ends of each arch crown support 1-1, then respectively connecting one arch shoulder support 1-2, aligning and fixedly connecting a pipe bell mouth 6 of the arch crown support 1-1 with a pipe socket 7 of the arch shoulder support 1-2 in the circumferential direction, and finishing the installation of the arch shoulder supports 1-2.
3) And after the lower joint of each arch shoulder support 1-2 is subjected to waterproof treatment, the lower end of each arch shoulder support 1-2 is connected with one arch foot support 1-3, and the pipe bell mouth 6 of each arch shoulder support 1-2 is aligned and fixedly connected with the pipe socket 7 of each arch foot support 1-3 in the circumferential direction, so that the arch foot supports 1-3 are installed.
4) And respectively carrying out waterproof treatment on the lower joint of each arch springing bracket 1-3, connecting the arch bottom brackets 1-4 between the two arch springing brackets 1-3, and aligning and fixedly connecting the pipe sockets 7 of the arch bottom brackets 1-4 with the pipe sockets 7 of the arch springing brackets 1-3 in the ring direction to finish the installation of the arch bottom brackets 1-4.
5) And after the buckling-restrained combined arch centering is closed into a ring, grouting operation is carried out from the grouting hole 12 until no air or floating slag overflows from the exhaust hole 11, and pouring of the concrete 2-1 in the pipe is completed.
6) After the operation of 2 adjacent buckling-restrained combined arch centering 1 and the operation of 2-1 in-pipe concrete are finished, the assembly operation of 2-2 precast concrete linings between the arch centering is carried out, so that the buckling-restrained combined arch centering 1 and the in-pipe concrete 2-1 together form a combined structure supporting system.
7) And (3) installing the arch bottom linings 2-2-4, performing waterproof treatment on the surfaces of the lining joints 13 and the bulges 14 between the arch frames, aligning the bolt holes 9 with the fixing bolts 8 of the adjacent 2 arch foot supports 1-3, and simultaneously aligning the corner plate installation joints 10 with the reinforced corner plates 5 for installation to complete the installation of the arch bottom linings 2-2-4.
8) Installing the arch springing 2-2-3, performing waterproof treatment on the surface of the lining joint 13 and the arch center bulge 14, aligning the bolt hole 9 at the lower part with the fixing bolt 8 of the adjacent 2 arch springing supports 1-3, aligning the bolt hole 9 at the upper part with the fixing bolt 8 of the adjacent 2 arch shoulder supports 1-2, and aligning the corner plate installation joint 10 with the reinforcing corner plate 5 for installation, thereby completing the installation of the arch springing 2-2-3.
9) Installing an arch shoulder lining 2-2-2, performing waterproof treatment on the surface of a lining joint 13 and an arch center bulge 14, aligning bolt holes 9 at the lower part with fixing bolts 8 of 2 adjacent arch shoulder brackets 1-2, aligning bolt holes 9 at the upper part with fixing bolts 8 of 2 adjacent arch bracket 1-1, and aligning a corner plate installation seam 10 with a reinforcing corner plate 5 for installation to finish the installation of the arch shoulder lining 2-2-2.
10) Installing a vault lining 2-2-1, performing waterproof treatment on the surfaces of a lining joint 13 and an arch center bulge 14, aligning bolt holes 9 with fixing bolts 8 of 2 adjacent vault supports 1-1, and simultaneously aligning a corner plate installation seam 10 with a reinforced corner plate 5 for installation to finish the installation of the vault lining 2-2-1.
11) After the prefabricated concrete lining 2-2 is installed, secondary lining construction can be carried out according to the specific requirements of the project.
In order to solve the problems that the existing loess tunnel arch frame is easy to distort and destabilize, the support strength of sprayed concrete is insufficient, the dust in the construction environment is large, and the construction efficiency is low, the invention provides a tunnel buckling-restrained assembled combined support structure, which improves the stability of the arch frame through a buckling-restrained design and prevents wing plates from generating 'wave-shaped' and 'folded-over' yield deformation. By adopting the fabricated concrete lining, the support bearing capacity which is lost in the concrete curing process is improved, and a segmental splicing scheme suitable for a tunnel excavation method is formed. The buckling-restrained assembled combined supporting structure better strengthens the primary support of the tunnel, can provide support counter-force more quickly, and has a more stable bearing structure and quicker assembly construction.
Claims (10)
1. The buckling-restrained assembled tunnel combined structure supporting system is characterized by comprising a plurality of buckling-restrained combined arches (1) which are closely arranged, wherein each buckling-restrained combined arch (1) comprises a wing plate (3), a core tube (4), a reinforcing angle plate (5) and a fixing bolt (8); the core pipe (4) is arranged on the inner side of the wing plate (3), and the reinforcing angle plate (5) and the fixing bolt (8) are arranged on two sides of the core pipe (4);
concrete (2-1) in the core pipe (4) is poured, and precast concrete linings (2-2) are installed between the adjacent anti-buckling combined arch frames (1);
the precast concrete lining (2-2) comprises four parts of lining: the four-part lining comprises a vault lining (2-2-1), an arch shoulder lining (2-2-2), an arch foot lining (2-2-3) and an arch bottom lining (2-2-4), wherein corner plate mounting seams (10) are formed in the four parts of the lining, and bolt holes (9) are reserved in the end parts of the four parts of the lining;
the positions of the bolt holes (9) are matched with the positions of the fixing bolts (8), and the positions of the corner plate mounting seams (10) are matched with the positions of the reinforcing corner plates (5);
the buckling-restrained combined arch center (1) is provided with grouting holes (8).
2. The buckling-restrained assembled tunnel composite structural support system according to claim 1, wherein in the longitudinal direction, a mounting gap is left between adjacent flanges (3), and an inter-arch protrusion (14) is preset on the outer edge surface of the four-part lining, and the inter-arch protrusion (14) is used for filling the gap of the adjacent buckling-restrained assembled arch (1).
3. The buckling-restrained assembled tunnel composite structural support system according to claim 1, wherein each buckling-restrained assembled arch (1) is divided into a dome leg (1-1), a shoulder leg (1-2), a back leg (1-3) and a soffit leg (1-4) in an annular direction;
the arch crown support (1-1) and the arch bottom support (1-4) are arranged oppositely, the arch shoulder support (1-2) is symmetrically arranged at two ends of the arch crown support (1-1), the arch foot support (1-3) is symmetrically arranged at two ends of the arch bottom support (1-4), and the arch crown support (1-1) and the arch shoulder support (1-2), the arch shoulder support (1-2) and the arch foot support (1-3) and the arch bottom support (1-4) are connected in a socket joint mode.
4. The buckling-restrained assembled tunnel composite structure supporting system as recited in claim 3, wherein both ends of the dome lining (2-2-1) are located between the adjacent dome legs (1-1), the upper ends of the shoulder linings (2-2-2) are located between the adjacent dome legs (1-1), the lower ends are located between the adjacent shoulder legs (1-2), the upper ends of the arch foot linings (2-2-3) are located between the adjacent shoulder legs (1-2), the lower ends are located between the adjacent arch foot legs (1-3), and both ends of the arch foot linings (2-2-4) are located between the adjacent arch foot legs (1-3).
5. The buckling-restrained assembled tunnel composite structure supporting system as claimed in claim 3, wherein the arch support (1-1) comprises an arch wing plate (3-1) and an arch core tube (4-1), and the arch core tube (4-1) is fixed inside the arch wing plate (3-1); a plurality of reinforcing angle plates (5) and two groups of fixing bolts (8) are arranged on the arch crown wing plate (3-1), and the reinforcing angle plates (5) and the fixing bolts (8) are symmetrically arranged on two sides of the arch crown core tube (4-1);
the arch shoulder support (1-2) comprises an arch waist wing plate (3-2) and an arch waist core tube (4-2), wherein the arch waist core tube (4-2) is fixed on the inner side of the arch waist wing plate (3-2); a plurality of reinforcing angle plates (5) and a group of fixing bolts (8) are arranged on the arch waist wing plate (3-2), and the reinforcing angle plates (5) and the fixing bolts (8) are symmetrically arranged at two sides of the arch waist core tube (4-2);
the arch springing support (1-3) comprises an arch springing wing plate (3-3) and an arch springing core tube (4-3), wherein the arch springing core tube (4-3) is fixed at the inner side of the arch springing wing plate (3-3); a plurality of reinforcing angle plates (5) and a group of fixing bolts (8) are arranged on the arch foot wing plates (3-3), and the reinforcing angle plates (5) and the fixing bolts (8) are symmetrically arranged at two sides of the arch foot core tube (4-3);
the arch bottom support (1-4) comprises an arch bottom wing plate (3-4) and an arch bottom core tube (4-4), the arch bottom core tube (4-4) is fixed on the inner side of the arch bottom wing plate (3-4), a plurality of reinforcing angle plates (5) are arranged on the arch bottom wing plate (3-4), and the reinforcing angle plates (5) are symmetrically arranged on two sides of the arch bottom core tube (4-4).
6. The buckling-restrained assembled tunnel composite structure supporting system as claimed in claim 5, wherein the arch core tube (4-1) and the waist core tube (4-2), the waist core tube (4-2) and the arch core tube (4-3) and the arch core tube (4-4) are all connected in a circumferential direction through a tube socket (6) and a tube socket (7).
7. The buckling-restrained assembled tunnel composite structural support system according to claim 5, wherein a pipe socket (6) is adopted at both ends of the arch-crown core pipe (4-1); one end of the arch waist core tube (4-2) and one end of the arch foot core tube (4-3) adopt tube bell mouths (6), and the other end adopts a tube socket (7); the two ends of the arch bottom core tube (4-4) adopt tube sockets (7).
8. The buckling-restrained assembled tunnel composite structural support system according to claim 5, wherein grouting holes (8) are preset on the arch springing core tubes (4-3); the vault wing plate (3-1) is provided with an exhaust hole (11) in advance.
9. The construction method of the buckling restrained assembled tunnel combined structure supporting system as claimed in any one of claims 1 to 8, comprising the steps of:
1) after the soil body is excavated, a plurality of buckling-restrained combined arch frames (1) are closely arranged and installed in a chamber in the excavation direction;
2) grouting is carried out through the grouting holes (8) to finish the pouring of the concrete (2-1) in the pipe;
3) installing precast concrete lining (2-2) between every two adjacent anti-buckling combined arches (1), specifically:
3.1 installing arch bottom lining (2-2-4): aligning bolt holes (9) of the arch bottom linings (2-2-4) with fixing bolts (8) of 2 adjacent arch foot supports (1-3), aligning an angle plate mounting seam (10) with a reinforced angle plate (5) and then mounting to finish the mounting of the arch bottom linings (2-2-4);
3.2 installing arch springing lining (2-2-3): aligning bolt holes (9) at the lower part of the arch foot lining (2-2-3) with fixing bolts (8) of 2 adjacent arch foot supports (1-3), aligning bolt holes (9) at the upper part of the arch foot lining (2-2-3) with fixing bolts (8) of 2 adjacent arch shoulder supports (1-2), and simultaneously aligning an angle plate mounting seam (10) with a reinforcing angle plate (5) for mounting to complete the mounting of the arch foot lining (2-2-3);
3.3 installing the arch shoulder lining (2-2-2): aligning bolt holes (9) at the lower part of the arch shoulder lining (2-2-2) with fixing bolts (8) of 2 adjacent arch shoulder brackets (1-2), aligning bolt holes (9) at the upper part of the arch shoulder lining (2-2-2) with fixing bolts (8) of 2 adjacent arch bracket (1-1), and simultaneously aligning and installing an angle plate installation seam (10) and a reinforced angle plate (5) to finish the installation of the arch shoulder lining (2-2-2);
3.4 installing the vault lining (2-2-1): and (3) performing waterproof treatment on the surfaces of the lining joints (13) and the bulges (14) between the arch frames, aligning the bolt holes (9) with the fixing bolts (8) of 2 adjacent arch supports (1-1), and aligning the corner plate mounting joints (10) with the reinforcing corner plates (5) for mounting to complete the mounting of the arch lining (2-2-1).
10. The construction method of the buckling-restrained assembled tunnel composite structural support system according to claim 9, wherein each buckling-restrained assembled arch (1) is divided into a dome leg (1-1), a shoulder leg (1-2), a back leg (1-3) and a soffit leg (1-4) in a circumferential direction;
in the step 1), the installation steps of the anti-buckling combined arch center (1) are as follows:
1.1, firstly installing a vault support (1-1) at the top of the underground chamber to complete the installation of the vault support (1-1);
1.2, respectively connecting an arch shoulder support (1-2) at two ends of the arch support (1-1) to complete the installation of the arch shoulder supports (1-2);
1.3, connecting an arch springing support (1-3) at the lower end of each arch shoulder support (1-2) to complete the installation of the arch springing supports (1-3);
1.4 connecting the arch bottom brackets (1-4) between the two arch foot brackets (1-3) to complete the installation of the arch bottom brackets (1-4);
1.5, repeating the steps 1.1-1.4 to finish the next anti-buckling combined arch centering (1).
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