CN113202518A - Assembled corrugated steel-filling layer composite tunnel supporting system and construction method thereof - Google Patents
Assembled corrugated steel-filling layer composite tunnel supporting system and construction method thereof Download PDFInfo
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- CN113202518A CN113202518A CN202110613226.9A CN202110613226A CN113202518A CN 113202518 A CN113202518 A CN 113202518A CN 202110613226 A CN202110613226 A CN 202110613226A CN 113202518 A CN113202518 A CN 113202518A
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- 239000002131 composite material Substances 0.000 title claims abstract description 79
- 238000010276 construction Methods 0.000 title claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 420
- 239000010959 steel Substances 0.000 claims abstract description 420
- 239000004567 concrete Substances 0.000 claims abstract description 77
- 238000009412 basement excavation Methods 0.000 claims abstract description 14
- 239000011435 rock Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 24
- 230000007704 transition Effects 0.000 claims description 9
- 239000011440 grout Substances 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- E21D11/20—Special cross- sections, e.g. corrugated
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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
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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Abstract
The invention belongs to the field of tunnel construction, and particularly relates to an assembled corrugated steel-filling layer composite tunnel supporting system and a construction method thereof. The technical scheme is as follows: the corrugated steel-filling layer composite slab comprises a corrugated steel-filling layer composite slab, a steel pipe-concrete composite beam, a small advanced guide pipe and an H-shaped steel bearing structure; the steel pipe-concrete composite beam is a connecting member arranged between the upper corrugated steel-filled layer composite plate and the next corrugated steel-filled layer composite plate; the corrugated steel-filling layer combined plate comprises an upper step part and a lower step part, the upper step part and the lower step part are combined together through an H-shaped steel bearing structure, and the end of the H-shaped steel bearing structure is fixedly connected with the steel pipe-concrete combined beam through a high-strength bolt; and a plurality of small advanced guide pipes penetrate through the steel pipe-concrete combined beam and then are inserted in front of the tunnel excavation tunnel face, and the tail ends of the small advanced guide pipes are arranged on the steel pipe-concrete combined beam. The invention has the advantages of low engineering cost, light weight, strong bearing capacity, simple and convenient repair and the like, and has better applicability in the field of tunnel construction.
Description
Technical Field
The invention belongs to the field of tunnel construction, and particularly relates to an assembled corrugated steel-filling layer composite tunnel supporting system and a construction method thereof.
Background
At present, two construction methods, namely an open excavation method and a subsurface excavation method, are commonly adopted in tunnel construction, in the subsurface excavation tunnel construction, spray anchor support is commonly adopted as a tunnel primary support system, and the whole support system consists of a concrete layer, a steel bar grating, an anchor rod and other members and commonly bears the pressure of surrounding rocks. Traditional spray anchor support construction cycle is longer, can't realize the quick closure of country rock, and the cost is higher simultaneously, and it is comparatively difficult when the later stage is restoreed, and above-mentioned shortcoming makes undercut tunnel construction method have certain limitation when using.
Based on the conventional shotcrete support system, many scholars propose a support system using a corrugated steel plate as a main support structure. The corrugated steel plate has the advantages of high strength, good bending resistance and the like, other components such as the corrugated steel plate are assembled components, the components are assembled on site after factory prefabrication is completed, the construction is simple and convenient, the construction period is effectively reduced, and meanwhile, the precision of the components is ensured by factory prefabrication, so that the construction quality is met. The corrugated steel plate is used as a supporting structure, concrete does not need to be sprayed in the construction process, the use of the concrete is reduced, and the construction cost is reduced.
At present, the corrugated steel plate tunnel support system still has a plurality of defects:
1) in the prior art, the introduction of the advance support in the tunnel support is few, how the small advance guide pipe is combined with other components in the whole corrugated steel plate support system is not described, and a matched construction method is not provided, so that the advance support is difficult to really apply in the construction process.
2) In the prior art, steel supports, angle steels and other members are usually adopted for reinforcing corrugated steel plates and ring beams, the construction process is complex, and the construction period and the construction cost are increased.
3) In the prior art, the corrugated steel plates are longitudinally connected by adopting bolts for direct connection, and the bolts at the back parts of the corrugated steel plates are difficult to fix no matter the lap joint mode or the flange plates are adopted.
The prior art is as follows:
1) corrugated steel plate tunnel primary support structure and tunnel (grant notice number CN 212337366U)
The method comprises the following steps: the supporting capacity of going up the step in the work progress is strengthened to ring beam and deck plate adoption different reinforcement measures, and these measures make the construction process become complicated, have increased construction period, and the steel shotcrete that needs, angle steel and floor are more, and construction cost increases, does not have supporting advance support system in this patent simultaneously for the application of this patent has had certain restriction.
2) Corrugated steel plate assembly for support and tunnel support method (grant notice No. CN 107435547B)
The method comprises the following steps: in order to ensure the firmness of connection, adjacent corrugated steel plate units are connected by bolts in a lap joint mode, and no other member is used as a connecting member between the longitudinal corrugated steel plates. The method is difficult to realize in the construction process, surrounding rocks are arranged behind the corrugated steel plates, and after the adjacent corrugated steel plate units are lapped, bolts at the back parts of the corrugated steel plates are difficult to fix.
3) Steel-FRP composite corrugated steel plate tunnel supporting method (application publication number CN 107780949A)
The method comprises the following steps: the patent does not describe the advance support part of the tunnel in detail, but simply explains that the surrounding rock is reinforced by advance grouting through the advance grouting small guide pipe before excavation, and no related construction method exists. Meanwhile, the corrugated steel plates are longitudinally connected through the flanges and the two rows of bolts, the method is difficult to achieve in the construction process, and surrounding rocks are arranged behind the corrugated steel plates, so that the upper row of bolts at the joint of the corrugated steel plates are difficult to install. The corrugated steel plate and the side wall corrugated steel plate of the upper step are fixed through the foot locking anchor rod at the arch foot, and more holes need to be reserved in the corrugated steel plate in the method, so that the integrity of the corrugated steel plate is damaged.
Disclosure of Invention
The invention discloses an assembled corrugated steel-filling layer composite tunnel supporting system and a construction method thereof, wherein components are produced in a standardized manner in a factory and assembled on site, so that the construction time is saved, the surrounding rock can be quickly sealed, and the primary supporting of a tunnel is completed; the method has the advantages of low engineering cost, light weight, strong bearing capacity, simple and convenient repair and the like.
The technical scheme of the invention is as follows:
an assembled corrugated steel-filling layer composite tunnel supporting system comprises a corrugated steel-filling layer composite plate, a steel pipe-concrete composite beam, a small advanced guide pipe and an H-shaped steel bearing structure, wherein the steel pipe-concrete composite beam is a connecting member arranged between an upper corrugated steel-filling layer composite plate and a lower corrugated steel-filling layer composite plate; the corrugated steel-filling layer combined plate comprises an upper step part and a lower step part, the upper step part and the lower step part are combined together through an H-shaped steel bearing structure, and the end of the H-shaped steel bearing structure is fixedly connected with the steel pipe-concrete combined beam through a high-strength bolt; and a plurality of small advanced guide pipes penetrate through the steel pipe-concrete composite beam and then are inserted in front of the tunnel excavation face, the tail ends of the small advanced guide pipes are arranged on the steel pipe-concrete composite beam, and the included angle between the small advanced guide pipes and the corrugated steel-filling layer composite plate is 8-12 degrees.
Further, the assembled corrugated steel-filled layer composite tunnel supporting system is characterized in that the corrugated steel-filled layer composite plate comprises a corrugated steel plate and a concrete filled layer; a first grouting hole is reserved in the corrugated steel plate, grouting is carried out on the back of the pair of corrugated steel plates through the first grouting hole, and a concrete filling layer is formed between the back of the corrugated steel plate and a surrounding rock interface; the corrugated steel plate and the concrete filling layer form a combined structure to bear force together so as to improve the supporting capacity.
Furthermore, in the assembled corrugated steel-filling layer composite tunnel supporting system, the edge of the corrugated steel plate is welded with a flange; a first bolt hole is reserved in the flange; the corrugated steel plates are connected and assembled in staggered joints through high-strength bolts. Furthermore, in the assembled corrugated steel-filling layer composite tunnel supporting system, the corrugated steel plates are respectively a first corrugated steel plate, a second corrugated steel plate, a third corrugated steel plate and a fourth corrugated steel plate; the upper step part of the corrugated steel-filling layer combined plate is formed by combining and connecting a first corrugated steel plate, a second corrugated steel plate and a third corrugated steel plate, and two ends of the third corrugated steel plate are respectively connected with the first corrugated steel plate and the second corrugated steel plate; the lower step portion of the corrugated steel-filled layer composite plate is formed of a fourth corrugated steel plate.
Furthermore, in the assembled corrugated steel-filled layer composite tunnel supporting system, the first corrugated steel plate and the second corrugated steel plate are both connected between the steel pipe-concrete composite beam and the third corrugated steel plate, and the first corrugated steel plate and the second corrugated steel plate are transition corrugated steel plates; the wave forms of the first corrugated steel plate and the second corrugated steel plate are transition waves with large wave forms and small wave forms, the size of the large wave forms is consistent with that of the third corrugated steel plate, and the size of the small wave forms is smaller than that of the third corrugated steel plate; the first corrugated steel plate and the second corrugated steel plate play a transition role between the steel pipe-concrete composite beam and the third corrugated steel plate, so that the angle of the advanced small guide pipe is effectively reduced, and the corrugated steel plate is prevented from colliding with the advanced small guide pipe in the construction process.
Furthermore, in the assembled corrugated steel-filling layer composite tunnel supporting system, shear nails are welded at the wave troughs on the back of the corrugated steel plate component so as to improve the anti-sliding performance between the corrugated steel plate and the concrete filling layer.
Further, the fabricated corrugated steel-filled layer composite tunnel supporting system is characterized in that the steel tube-concrete composite beam comprises an annular steel tube and in-tube concrete, and the in-tube concrete is poured into the steel tube; the steel pipe is formed by splicing steel pipe components, each steel pipe component is provided with a socket structure, a bolt hole II, a preformed hole and a grouting hole II, and the steel pipe components are spliced together through the socket structure; the preformed hole is used for supporting the small advanced guide pipe, and the grouting hole II is used for grouting into the steel pipe; and the socket structures and the steel pipes and the corrugated steel plates are connected by high-strength bolts.
Further, the assembled corrugated steel-filling layer composite tunnel supporting system is characterized in that the H-shaped steel bearing structure comprises H-shaped steel and a foot locking anchor rod; the web plate of the H-shaped steel is provided with a stiffening rib and a locking anchor rod hole; drilling a hole into the surrounding rock through the foot-locking anchor rod hole, penetrating the foot-locking anchor rod through the foot-locking anchor rod hole, and then inserting the foot-locking anchor rod into the surrounding rock, so as to fix the H-shaped steel on the surrounding rock; end connecting plates are welded at two ends of the H-shaped steel, and the end connecting plates are provided with bolt holes III; the upper flange part and the lower flange part of the H-shaped steel are provided with a fourth bolt hole; the H-shaped steel, the H-shaped steel and the corrugated steel plate and the H-shaped steel and the steel pipe-concrete composite beam are connected by high-strength bolts.
The construction method of the assembled corrugated steel-filling layer composite tunnel supporting system comprises the following steps:
1) carrying out advanced support operation:
splicing the steel pipe components at the tunnel portal, wherein the steel pipe components are connected through the socket structure, and splicing construction is sequentially performed from one side to the other side; after the assembly of the steel pipe components is completed, drilling holes into the surrounding rock through the reserved holes, driving the advanced small guide pipes into the surrounding rock, and then grouting the advanced small guide pipes to realize advanced support operation in the construction process;
2) and (3) carrying out upper step support construction:
firstly, excavating an upper step part of a tunnel and reserving a core soil part; h-shaped steel is installed after excavation is finished, H-shaped steel is installed at the elevation position of the arch springing, holes are drilled into surrounding rocks through the foot locking anchor rod holes, foot locking anchor rods are driven into the surrounding rocks to fix the H-shaped steel, and the steel pipe member is connected with the H-shaped steel through high-strength bolts;
assembling corrugated steel plates, namely assembling first corrugated steel plates from two sides to an arch crown, connecting the first corrugated steel plates with H-shaped steel at two sides of an arch foot, and connecting the first corrugated steel plates with the steel pipe members through high-strength bolts; assembling a third corrugated steel plate after the first corrugated steel plate is assembled, assembling a second corrugated steel plate after the third corrugated steel plate is assembled, and connecting the second corrugated steel plate with a steel pipe component of a next ring through a high-strength bolt; the third corrugated steel plate and the second corrugated steel plate are connected with the H-shaped steel on two sides of the arch springing; the first corrugated steel plate, the third corrugated steel plate and the second corrugated steel plate are connected through high-strength bolts; the corrugated steel plates are assembled in a staggered joint mode;
3) and (3) carrying out tunnel lower step construction:
excavating a core soil part and a lower step part of an upper step of the tunnel; assembling fourth corrugated steel plates after excavation is finished, wherein the assembling sequence is that the fourth corrugated steel plates are symmetrically constructed from two sides to the bottom, the fourth corrugated steel plates on two sides of the lower step are connected with the H-shaped steel through high-strength bolts, so that the corrugated steel plates of the upper step and the lower step form a closed annular whole, and after one ring is assembled, tunnel supporting construction of the next ring is carried out along longitudinal construction;
4) grouting construction:
after the corrugated steel plates are assembled, pouring concrete grout into the steel pipe members through two pairs of grouting holes to form concrete in the pipes; then pouring concrete grout behind the pair of corrugated steel plates through the grouting holes, wherein the grouting sequence is from two sides to the middle along the longitudinal construction direction to form a concrete filling layer; the corrugated steel plate and the concrete filling layer form a combined structure through the shear nails, and a complete assembled corrugated steel-filling layer composite tunnel supporting system is formed after the concrete is initially set.
Further, in the construction method of the assembled corrugated steel-filling layer composite tunnel supporting system, the steel pipe is assembled in a semi-ring or whole ring mode.
The invention has the beneficial effects that:
1) the invention provides a tunnel primary support concept based on a corrugated steel plate-filling layer combined plate structure and a steel pipe-concrete combined beam structure, and the combined structure is formed by filling concrete at the back of a corrugated steel plate member and inside a steel pipe member, so that the problems of low bearing capacity of a steel structure and poor deformation resistance of a concrete structure are solved, and the bearing capacity of the support structure is improved.
2) The invention provides a steel pipe-concrete combined beam member, which is used as a connecting member between corrugated steel plates of an upper ring and a lower ring, and solves the defect of inconvenient connection between the longitudinal corrugated steel plates through bolts. The steel pipe in the component is reserved with bolt holes connected with corrugated steel plates on two sides, a socket structure used for assembling the steel pipe into a ring, a reserved hole used for bearing a small advanced guide pipe and a grouting hole used for grouting inside the steel pipe. The inside grout of steel pipe not only can form integrated configuration, improves the component bearing capacity, has also improved the joint strength of this connected node simultaneously.
3) The invention provides a combined supporting system of a corrugated steel plate, a steel pipe and a small advanced guide pipe, completely introduces a construction method of advanced support in a corrugated steel plate tunnel supporting system, makes up for the vacancy in the prior related technical field, and solves the problem that the strength of the corrugated steel plate is reduced because the small advanced guide pipe penetrates and cuts the corrugated steel plate when the corrugated steel plate is singly used for supporting. Meanwhile, in order to meet the angle requirement of the advanced small guide pipe, three different corrugated steel plates are adopted in the upper step construction part, so that the corrugated steel plates, the square steel pipe and the advanced small guide pipe are connected more reasonably, and the construction process is simpler and more convenient.
4) The invention designs a ribbed H-shaped steel member as a connecting piece of an upper step member and a lower step member, wherein stiffening ribs are welded on the belly of the member to improve the compression resistance, a foot-locking anchor rod hole is reserved in a web plate for driving a foot-locking anchor rod, and a connecting plate is arranged at the end part to realize self splicing, thereby effectively solving the problems of arch foot shrinkage and upper step bearing.
Drawings
Fig. 1 is a general structure diagram of an assembled corrugated steel-filling layer composite tunnel supporting system;
FIG. 2 is a view showing a structure of a first deck plate member;
FIG. 3 is a structural view of a third corrugated steel plate member;
FIG. 4 is a structural view of a steel pipe member;
FIG. 5 is a connection effect diagram of the advance support structure;
FIG. 6 is a longitudinal cross-sectional view of the forepoling structure connection;
FIG. 7 is a structural view of an H-shaped steel support.
In the figure: 1-corrugated steel-filling layer composite plate, 2-steel pipe-concrete composite beam, 3-H type steel supporting structure, 5-shear nail, 6-high-strength bolt, 11-first corrugated steel plate, 12-second corrugated steel plate, 13-third corrugated steel plate, 14-fourth corrugated steel plate, 15-concrete filling layer, 16-flange, 161-bolt hole I, 17-grouting hole I, 21-steel pipe component, 22-advanced small pipe, 23-in-pipe concrete, 31-H type steel, 32-foot locking anchor rod, 211-preformed hole, 212-grouting hole II, 213-socket structure, 214-bolt hole II, 311-foot locking anchor rod hole, 312-stiffening rib, 313-end connecting plate, 314-bolt hole III, 315-bolt hole four.
Detailed Description
As shown in fig. 1-7, an assembled corrugated steel-filled layer composite tunnel supporting system includes a corrugated steel-filled layer composite slab 1, a steel pipe-concrete composite beam 2, a small advanced conduit 22 and an H-shaped steel supporting structure 3; the steel pipe-concrete composite beam 2 is a connecting member arranged between the upper corrugated steel-filled layer composite plate 1 and the next corrugated steel-filled layer composite plate 1; the corrugated steel-filling layer combined plate 1 comprises an upper step part and a lower step part, the upper step part and the lower step part are combined together through an H-shaped steel bearing structure 3, and the end of the H-shaped steel bearing structure 3 is fixedly connected with the steel pipe-concrete combined beam 2 through a high-strength bolt 6; a plurality of small advanced guide pipes 22 penetrate through the steel pipe-concrete composite beam 2 and then are inserted in front of the tunnel excavation face, the tail ends of the small advanced guide pipes 22 are arranged on the steel pipe-concrete composite beam 2, and the included angle between the small advanced guide pipes 22 and the corrugated steel-filling layer composite plate 1 is 10 degrees.
The corrugated steel-filled layer combined plate 1 comprises a corrugated steel plate and a concrete filled layer 15; a first grouting hole 17 is reserved in the corrugated steel plate, grouting is performed on the back of the corrugated steel plate through the first grouting hole 17, and a concrete filling layer 15 is formed between the back of the corrugated steel plate and a surrounding rock interface; the corrugated steel plate and the concrete filling layer 15 form a combined structure to be stressed together so as to improve the supporting capacity.
The flange 16 is welded at the edge of the corrugated steel plate; a first bolt hole 161 is reserved in the flange 16; the corrugated steel plates are connected and assembled in staggered joints through high-strength bolts 6. The corrugated steel plates are respectively a first corrugated steel plate 11, a second corrugated steel plate 12, a third corrugated steel plate 13 and a fourth corrugated steel plate 14; the upper step part of the corrugated steel-filled layer combined plate 1 is formed by combining and connecting a first corrugated steel plate 11, a second corrugated steel plate 12 and a third corrugated steel plate 13, and two ends of the third corrugated steel plate 13 are respectively connected with the first corrugated steel plate 11 and the second corrugated steel plate 12; the lower step portion of the corrugated steel-filled sheet assembled panel 1 is constituted by the fourth corrugated steel sheet 14.
The first corrugated steel plate 11 and the second corrugated steel plate 12 are connected between the steel pipe-concrete composite beam 2 and the third corrugated steel plate 13, and the properties of the first corrugated steel plate and the second corrugated steel plate are transition corrugated steel plates; the waveforms of the first corrugated steel plate 11 and the second corrugated steel plate 12 are transition waves with large waveforms and small waveforms, the size of the large waveforms is consistent with that of the third corrugated steel plate 13, and the size of the small waveforms is smaller than that of the third corrugated steel plate 13; the first corrugated steel plate 11 and the second corrugated steel plate 12 play a transition role between the steel pipe-concrete composite beam 2 and the third corrugated steel plate 13, so that the angle of the advanced small guide pipe 22 is effectively reduced, and the corrugated steel plates are prevented from colliding with the advanced small guide pipe 22 in the construction process.
The first corrugated steel sheet 11 has a wave pitch × wave height × wall thickness of 230mm × 64mm × 5 mm; the second corrugated steel plate 12 has dimensions of pitch × height × thickness of wave 230mm × 64mm × 5 mm; the half period of the joint of the edges of the first corrugated steel plate 11 and the second corrugated steel plate 12 is the same as the size of the third corrugated steel plate 13; the third corrugated steel plate 13 has dimensions of wave pitch × wave height × wall thickness of 400mm × 150mm × 5 mm; the fourth corrugated steel plate 14 has dimensions of wave pitch × wave height × wall thickness of 400mm × 150mm × 5 mm; the first corrugated steel plate 11 has a specification, and the arc length is 3 meters; the second corrugated steel plate 12 and the third corrugated steel plate 13 have two specifications, and the arc lengths are 1.5 m and 3.0 m respectively.
Shear pins 5 are welded at wave troughs on the back of the corrugated steel plate component, and the shear pins 5 are round-head studs with the diameter of 10mm and the length of 100 mm.
The steel tube-concrete composite beam 2 comprises an annular steel tube and in-tube concrete 23, and the in-tube concrete 23 is poured into the steel tube; the steel pipe is formed by assembling steel pipe components 21, the steel pipe components 21 are provided with socket structures 213, bolt holes II 214, preformed holes 211 and grouting holes II 212, the steel pipe components 21 are assembled together through the socket structures 213, the preformed holes 211 are used for supporting the small advanced guide pipes 22, the grouting holes II 212 are used for grouting the inside of the steel pipe, and the socket structures 213 and the steel pipe and the corrugated steel plate are connected through high-strength bolts 6.
The small advanced guide pipe 22 is made of a seamless steel pipe with the diameter of 38mm-50 mm; the front end of the advanced small catheter 22 is in a cone shape with the length of 10cm, no hole is formed in the rear end of 100cm, and the rest part is provided with a pulp overflow hole with the diameter of 6mm in a quincunx shape with the length of 20-30 cm.
The H-shaped steel supporting structure 3 comprises H-shaped steel 31 and a foot-locking anchor rod 32, wherein a web plate of the H-shaped steel 31 is provided with a stiffening rib 312 and a foot-locking anchor rod hole 311; drilling a hole into the surrounding rock through the foot-locking anchor rod hole 311, and inserting the foot-locking anchor rod 32 into the surrounding rock, so as to fix the H-shaped steel 31 on the surrounding rock; end connecting plates 313 are welded at two ends of the H-shaped steel 31, and the end connecting plates 313 are provided with bolt holes III 314; the upper flange part and the lower flange part of the H-shaped steel 31 are provided with four bolt holes 315; the H-shaped steel 31, the H-shaped steel 31 and the corrugated steel plate, and the H-shaped steel 31 and the steel pipe-concrete composite beam 2 are connected by high-strength bolts 6.
Example 1
The construction method of the assembled corrugated steel-filling layer composite tunnel supporting system comprises the following steps:
1) carrying out advanced support operation:
splicing the steel pipe members 21 at the tunnel portal, wherein the steel pipe members 21 are connected through the socket structure 213, and splicing construction is sequentially performed from one side to the other side; after the assembly of the steel pipe members 21 is completed, drilling holes into the surrounding rock through the preformed holes 211, driving the small advanced guide pipes 22 into the surrounding rock, and then grouting the small advanced guide pipes 22 to realize advanced support operation in the construction process;
2) and (3) carrying out upper step support construction:
firstly, excavating an upper step part of a tunnel and reserving a core soil part; h-shaped steel 31 is installed after excavation is finished, H-shaped steel 31 is installed at the elevation position of the arch springing, holes are drilled into surrounding rocks through the foot locking anchor rod holes 311, foot locking anchor rods 32 are driven into the surrounding rocks to fix the H-shaped steel 31, and the steel pipe member 21 and the H-shaped steel are connected through high-strength bolts;
then, assembling corrugated steel plates, namely assembling the first corrugated steel plates 11, assembling the first corrugated steel plates 11 from two sides to a vault, connecting the first corrugated steel plates 11 with the H-shaped steel 31 at two sides of the vault, and connecting the first corrugated steel plates 11 with the steel pipe members 21 through high-strength bolts 6; assembling the third corrugated steel plate 13 after the first corrugated steel plate 11 is assembled, assembling the second corrugated steel plate 12 after the third corrugated steel plate 13 is assembled, and connecting the second corrugated steel plate 12 with the steel pipe member 21 of the next ring through the high-strength bolt 6; the third corrugated steel plate 13 and the second corrugated steel plate 12 are connected with the H-shaped steel 31 at two sides of the arch springing; the first corrugated steel plate 11, the third corrugated steel plate 13 and the second corrugated steel plate 12 are connected through high-strength bolts 6; the corrugated steel plates are assembled in a staggered joint mode;
3) and (3) carrying out tunnel lower step construction:
excavating a core soil part and a lower step part of an upper step of the tunnel; assembling the fourth corrugated steel plates 14 after the excavation is finished, wherein the assembling sequence is that the fourth corrugated steel plates 14 are symmetrically constructed from two sides to the bottom, the fourth corrugated steel plates 14 on two sides of the lower step are connected with the H-shaped steel 31 through high-strength bolts 6, so that the corrugated steel plates of the upper step and the lower step form a closed annular whole, and after one ring is assembled, the tunnel supporting construction of the next ring is carried out along the longitudinal construction;
4) grouting construction:
after the corrugated steel plates are assembled, concrete grout is poured into the steel pipe member 21 through the second grouting hole 212 to form in-pipe concrete 23; then, pouring concrete grout behind the corrugated steel plate through the first grouting holes 17, wherein the grouting sequence is from two sides to the middle along the longitudinal construction direction to form a concrete filling layer 15; the corrugated steel plate and the concrete filling layer 15 form a combined structure through the shear nails 5, and after the concrete is initially set, a complete assembled corrugated steel-filling layer composite tunnel supporting system is formed.
Example 2
The difference from embodiment 1 is that in the construction method of the fabricated corrugated steel-filled layer composite tunnel supporting system, the steel pipe members 21 are assembled in an integral ring structure, and the fourth corrugated steel plate 14 and the steel pipe members 21 are connected by high-strength bolts 6.
Claims (10)
1. The utility model provides an assembled corrugated steel-filling layer composite tunnel support system which characterized in that: the corrugated steel-filling layer composite slab comprises a corrugated steel-filling layer composite slab, a steel pipe-concrete composite beam, a small advanced guide pipe and an H-shaped steel bearing structure; the steel pipe-concrete composite beam is a connecting member arranged between the upper corrugated steel-filled layer composite plate and the next corrugated steel-filled layer composite plate; the corrugated steel-filling layer combined plate comprises an upper step part and a lower step part, the upper step part and the lower step part are combined together through an H-shaped steel bearing structure, and the end of the H-shaped steel bearing structure is fixedly connected with the steel pipe-concrete combined beam through a high-strength bolt; and a plurality of small advanced guide pipes penetrate through the steel pipe-concrete composite beam and then are inserted in front of the tunnel excavation face, the tail ends of the small advanced guide pipes are arranged on the steel pipe-concrete composite beam, and the included angle between the small advanced guide pipes and the corrugated steel-filling layer composite plate is 8-12 degrees.
2. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 1, wherein: the corrugated steel-filling layer combined plate comprises a corrugated steel plate and a concrete filling layer; a first grouting hole is reserved in the corrugated steel plate, grouting is carried out on the back of the pair of corrugated steel plates through the first grouting hole, and a concrete filling layer is formed between the back of the corrugated steel plate and a surrounding rock interface; the corrugated steel plate and the concrete filling layer form a combined structure to bear force together so as to improve the supporting capacity.
3. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 2, wherein: welding a flange at the edge of the corrugated steel plate; a first bolt hole is reserved in the flange; the corrugated steel plates are connected and assembled in staggered joints through high-strength bolts.
4. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 3, wherein: the corrugated steel plates are respectively a first corrugated steel plate, a second corrugated steel plate, a third corrugated steel plate and a fourth corrugated steel plate; the upper step part of the corrugated steel-filling layer combined plate is formed by combining and connecting a first corrugated steel plate, a second corrugated steel plate and a third corrugated steel plate, and two ends of the third corrugated steel plate are respectively connected with the first corrugated steel plate and the second corrugated steel plate; the lower step portion of the corrugated steel-filled layer composite plate is formed of a fourth corrugated steel plate.
5. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 4, wherein: the first corrugated steel plate and the second corrugated steel plate are connected between the steel pipe-concrete combined beam and the third corrugated steel plate, and the first corrugated steel plate and the second corrugated steel plate are transition corrugated steel plates; the wave forms of the first corrugated steel plate and the second corrugated steel plate are transition waves with large wave forms and small wave forms, the size of the large wave forms is consistent with that of the third corrugated steel plate, and the size of the small wave forms is smaller than that of the third corrugated steel plate; the first corrugated steel plate and the second corrugated steel plate play a transition role between the steel pipe-concrete composite beam and the third corrugated steel plate, so that the angle of the advanced small guide pipe is effectively reduced, and the corrugated steel plate is prevented from colliding with the advanced small guide pipe in the construction process.
6. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 4, wherein: shear nails are welded at wave troughs on the back of the corrugated steel plate component to improve the anti-sliding performance between the corrugated steel plate and the concrete filling layer.
7. The fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 4, wherein: the steel tube-concrete combined beam comprises an annular steel tube and in-tube concrete, and the in-tube concrete is poured into the steel tube; the steel pipe is formed by splicing steel pipe components, each steel pipe component is provided with a socket structure, a bolt hole II, a preformed hole and a grouting hole II, and the steel pipe components are spliced together through the socket structure; the preformed hole is used for supporting the small advanced guide pipe, and the grouting hole II is used for grouting into the steel pipe; and the socket structures and the steel pipes and the corrugated steel plates are connected by high-strength bolts.
8. The fabricated corrugated steel-filled composite tunnel supporting system according to claim 7, wherein: the H-shaped steel bearing structure comprises H-shaped steel and a foot locking anchor rod; the web plate of the H-shaped steel is provided with a stiffening rib and a locking anchor rod hole; drilling a hole into the surrounding rock through the foot-locking anchor rod hole, penetrating the foot-locking anchor rod through the foot-locking anchor rod hole, and then inserting the foot-locking anchor rod into the surrounding rock, so as to fix the H-shaped steel on the surrounding rock; end connecting plates are welded at two ends of the H-shaped steel, and the end connecting plates are provided with bolt holes III; the upper flange part and the lower flange part of the H-shaped steel are provided with a fourth bolt hole; the H-shaped steel, the H-shaped steel and the corrugated steel plate and the H-shaped steel and the steel pipe-concrete composite beam are connected by high-strength bolts.
9. A construction method of an assembled corrugated steel-filled layer composite tunnel supporting system as claimed in claim 8, comprising the steps of:
1) carrying out advanced support operation:
splicing the steel pipe components at the tunnel portal, wherein the steel pipe components are connected through the socket structure, and splicing construction is sequentially performed from one side to the other side; after the assembly of the steel pipe components is completed, drilling holes into the surrounding rock through the reserved holes, driving the advanced small guide pipes into the surrounding rock, and then grouting the advanced small guide pipes to realize advanced support operation in the construction process;
2) and (3) carrying out upper step support construction:
firstly, excavating an upper step part of a tunnel and reserving a core soil part; h-shaped steel is installed after excavation is finished, H-shaped steel is installed at the elevation position of the arch springing, holes are drilled into surrounding rocks through the foot locking anchor rod holes, foot locking anchor rods are driven into the surrounding rocks to fix the H-shaped steel, and the steel pipe member is connected with the H-shaped steel through high-strength bolts;
assembling corrugated steel plates, namely assembling first corrugated steel plates from two sides to an arch crown, connecting the first corrugated steel plates with H-shaped steel at two sides of an arch foot, and connecting the first corrugated steel plates with the steel pipe members through high-strength bolts; assembling a third corrugated steel plate after the first corrugated steel plate is assembled, assembling a second corrugated steel plate after the third corrugated steel plate is assembled, and connecting the second corrugated steel plate with a steel pipe component of a next ring through a high-strength bolt; the third corrugated steel plate and the second corrugated steel plate are connected with the H-shaped steel on two sides of the arch springing; the first corrugated steel plate, the third corrugated steel plate and the second corrugated steel plate are connected through high-strength bolts; the corrugated steel plates are assembled in a staggered joint mode;
3) and (3) carrying out tunnel lower step construction:
excavating a core soil part and a lower step part of an upper step of the tunnel; assembling fourth corrugated steel plates after excavation is finished, wherein the assembling sequence is that the fourth corrugated steel plates are symmetrically constructed from two sides to the bottom, the fourth corrugated steel plates on two sides of the lower step are connected with the H-shaped steel through high-strength bolts, so that the corrugated steel plates of the upper step and the lower step form a closed annular whole, and after one ring is assembled, tunnel supporting construction of the next ring is carried out along longitudinal construction;
4) grouting construction:
after the corrugated steel plates are assembled, pouring concrete grout into the steel pipe members through two pairs of grouting holes to form concrete in the pipes; then pouring concrete grout behind the pair of corrugated steel plates through the grouting holes, wherein the grouting sequence is from two sides to the middle along the longitudinal construction direction to form a concrete filling layer; the corrugated steel plate and the concrete filling layer form a combined structure through the shear nails, and a complete assembled corrugated steel-filling layer composite tunnel supporting system is formed after the concrete is initially set.
10. The construction method of the fabricated corrugated steel-filled layer composite tunnel supporting system according to claim 9, wherein: the steel pipe assembly mode is semi-ring or whole ring.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622959A (en) * | 2021-09-10 | 2021-11-09 | 清华大学 | Tunnel supporting structure and construction method thereof |
| CN113802570A (en) * | 2021-08-30 | 2021-12-17 | 北京工业大学 | Circular foundation ditch steel corrugated plate-mould bag concrete supporting structure |
-
2021
- 2021-06-02 CN CN202110613226.9A patent/CN113202518A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802570A (en) * | 2021-08-30 | 2021-12-17 | 北京工业大学 | Circular foundation ditch steel corrugated plate-mould bag concrete supporting structure |
| CN113622959A (en) * | 2021-09-10 | 2021-11-09 | 清华大学 | Tunnel supporting structure and construction method thereof |
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