CN112228077A - Inclined tunnel construction method and support system thereof - Google Patents
Inclined tunnel construction method and support system thereof Download PDFInfo
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- CN112228077A CN112228077A CN202011004898.1A CN202011004898A CN112228077A CN 112228077 A CN112228077 A CN 112228077A CN 202011004898 A CN202011004898 A CN 202011004898A CN 112228077 A CN112228077 A CN 112228077A
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- 238000010276 construction Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000009412 basement excavation Methods 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000004567 concrete Substances 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram 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
- 238000010008 shearing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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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
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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
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Civil Engineering (AREA)
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel construction, in particular to a construction method of an inclined tunnel and a supporting system thereof. The end face of the inclined tunnel is divided into eight parts, the construction and excavation processes of all the parts are not affected, and the construction quality is guaranteed and the construction progress is accelerated through one-time complete construction. The construction period can be effectively shortened, and the consumption of manpower and material resources is greatly reduced. The successful construction of the inclined tunnel is greatly ensured, and the safety and the efficiency of passengers entering and exiting the underground deep-buried station are improved. Meanwhile, the construction safety risk is small, the excavation process is few, and the mechanical excavation is facilitated; reaches the leading level in China and the top level in the world, and has application prospect of popularization to home and abroad.
Description
Technical Field
The invention relates to the technical field of underground construction, in particular to a construction method of an inclined tunnel and a supporting system thereof.
Background
With the rapid development of urban rail transit, China has built a large number of subway stations, and the subway stations are generally small in scale, shallow in buried depth and multi-position in soil layers and are mainly constructed by adopting an open excavation method or a shallow buried excavation method. The increasing depth of the underground station leads to the increasing lifting height of the passengers when the passengers get out of the station, and the safety and efficiency of the passengers when the passengers get in and out of the station become problems which need to be solved urgently.
At present, the design method and the construction method of the inclined tunnel are not sufficiently researched. Compared with the common tunnel, the load calculation method under the inclined tunnel is different from that of the common tunnel, and increases the influence of shearing force, so that the structural reinforcing steel bars which are basically not stressed in the common tunnel become stressed reinforcing steel bars under the influence of the inclination angle. Therefore, new analysis should be performed in the method for determining the stability characteristics of the surrounding rock of the inclined tunnel and the load of the supporting structure, so that the supporting structure suitable for the inclined tunnel and the design method thereof are found. In terms of a construction method, due to the particularity of the inclined tunnel, the traditional construction method is difficult to adapt to the excavation of the inclined tunnel.
Disclosure of Invention
The invention aims to provide a construction method of an inclined tunnel and a supporting system thereof, so as to improve the problems. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in one aspect, an embodiment of the present application provides a method for constructing an inclined tunnel, where the method includes: dividing the section of the inclined tunnel into four layers and eight parts for reverse excavation construction, wherein the eight parts comprise a part A, a part B, a part C, a part D, a part E, a part F, a part G and a part H, the part A and the part B are arranged on a first layer, the part C and the part D are arranged on a second layer, the part E and the part F are arranged on a third layer, and the part G and the part H are arranged on a fourth layer; excavating the part A by using a weak blasting method, spraying concrete with the thickness of 5cm on the rock wall to seal the tunnel face after excavation, and performing construction of a foot locking anchor pipe and a system anchor rod; after the construction of the locking anchor pipe and the system anchor rod is finished, the construction of a primary arch frame and the construction of a middle partition wall are carried out; after the construction of the primary arch frame and the construction of the intermediate wall are finished, concrete is sprayed to the primary arch frame and the intermediate wall, and the primary arch frame and the intermediate wall are sealed; the excavation and supporting construction process of the part A is repeated, and excavation construction is sequentially carried out on the part B, the part C and the part D; excavating the part E, the part F, the part G and the part H in sequence by a short step method; and (3) after the bottommost part G and the bottommost part H are excavated, clearing the bottom, performing bottom plate arch center construction after clearing the bottom, spraying concrete to seal the whole section into a ring, and sequentially dismantling the intermediate wall.
Optionally, the construction direction of the inclined tunnel is that excavation construction is performed from top to bottom along the trend of the inclined tunnel.
Optionally, in the construction cycle of the part A to the part H, construction advances by 0.8m per cycle.
Optionally, during the weak blasting construction, 8 air leg rock drills are used for drilling, and the drilling direction is parallel to the trend of the inclined tunnel.
Optionally, when the weathering groove section is subjected to inclined tunnel construction, the method further comprises: after the excavation and supporting construction of the part A and the part B is finished, laying main reinforcing steel bars of a cover plate on the ground at the top of the excavation surface of the inclined tunnel of the weathering groove section; a grouting sleeve valve pipe is arranged between the cover plate main rib and the primary support arch centering, the upper end of the grouting sleeve valve pipe is connected with the cover plate main rib, and the lower end of the grouting sleeve valve pipe is connected with the primary support arch centering; and grouting into the grouting sleeve valve pipe, reinforcing the excavated surface of the inclined tunnel, grouting into the area provided with the main rib of the cover plate, and hardening to form the cover plate.
Optionally, the intermediate wall and the primary arch are both made of I22a steel.
Optionally, the number of the grouting sleeve valve pipes is multiple, and the plurality of grouting sleeve valve pipes are arranged in a quincunx manner.
Optionally, the bottom of the grouting sleeve valve pipe is connected with the primary arch through an L-shaped steel bar, one end of the L-shaped steel bar is welded to the bottom of the grouting sleeve valve pipe, and the other end of the L-shaped steel bar is welded to the primary arch.
On the other hand, the embodiment of the application provides an inclined tunnel construction supporting system, which comprises an inclined tunnel, a primary arch frame, a middle wall, a locking anchor pipe and a system anchor rod, wherein the primary arch frame is arranged on the inner wall of the inclined tunnel; the middle partition wall is arranged in the middle of the inclined tunnel, and the top of the middle partition wall is connected with the lower surface of the primary arch support; one end of the locking anchor pipe is connected with the outer surface of the primary arch centering, and the other end of the locking anchor pipe is arranged in the rock wall outside the primary arch centering; one end of the system anchor rod is connected with the outer surface of the primary arch centering, and the other end of the system anchor rod is arranged in the rock wall outside the primary arch centering.
Optionally, a cover plate is arranged on the ground at the top of the excavation face of the inclined tunnel, a grouting sleeve valve pipe is arranged between the cover plate and the primary support arch frame, one end of the grouting sleeve valve pipe is connected with a cover plate main rib of the cover plate, and the other end of the grouting sleeve valve pipe is connected with the primary support arch frame.
Optionally, the number of the grouting sleeve valve pipes is multiple, and the plurality of grouting sleeve valve pipes are arranged in a quincunx manner.
Optionally, the bottom of the grouting sleeve valve pipe is connected with the primary arch through an L-shaped steel bar, one end of the L-shaped steel bar is welded to the bottom of the grouting sleeve valve pipe, and the other end of the L-shaped steel bar is welded to the primary arch.
The invention has the beneficial effects that:
the end face of the inclined tunnel is divided into eight parts, the construction and excavation processes of all the parts are not affected, and the construction quality is guaranteed and the construction progress is accelerated through one-time complete construction. The construction period can be effectively shortened, and the consumption of manpower and material resources is greatly reduced. The successful construction of the inclined tunnel is greatly ensured, and the safety and the efficiency of passengers entering and exiting the underground deep-buried station are improved. Meanwhile, the construction safety risk is small, the excavation process is few, and the mechanical excavation is facilitated; reaches the leading level in China and the top level in the world, and has application prospect of popularization to home and abroad.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic illustration of the positions of part A to part H in an embodiment of the present invention;
FIG. 2 is a schematic view of the position of the cover plate and the grouting sleeve valve tube according to the embodiment of the invention;
FIG. 3 is a schematic view of the positions of the locking anchor tube and the primary arch according to the embodiment of the present invention;
FIG. 4 is a schematic illustration of the position of the anchor rod and primary arch of the system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the arrangement of the cover plate main rib structure and the quincunx-shaped grouting sleeve valve pipes connected with the cover plate main rib in the embodiment of the present invention;
fig. 6 is an enlarged schematic view at P in fig. 2.
The labels in the figure are: 1. a lock pin anchor tube; 2. grouting sleeve valve pipes; 3. an intermediate wall; 4. primarily supporting an arch frame; 5. a system anchor rod; 6. l-shaped steel bars; 7. a cover plate; 71. the main rib of the cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
The present embodiment provides a construction method of an inclined tunnel, which includes step S100, step S200, step S300, and step S400.
Step S100, dividing the section of the inclined tunnel into four layers and eight parts for reverse excavation construction by adopting a method of combining a step method layering thought with a CD method mid-partition wall related thought, wherein the eight parts comprise a part A, a part B, a part C, a part D, a part E, a part F, a part G and a part H, the part A and the part B are arranged on a first layer, the part C and the part D are arranged on a second layer, the part E and the part F are arranged on a third layer, and the part G and the part H are arranged on a fourth layer, as shown in figure 1; the construction sequence is the sequence of the letters in fig. 1, and the letters a-H in fig. 1 are part a-part H;
s200, excavating the part A by using a weak blasting method, spraying concrete with the thickness of 5cm on a rock wall to seal a tunnel face after excavating, and constructing a foot locking anchor pipe 1 and a system anchor rod 5; as shown in fig. 3 and 4, after the construction of the locking anchor pipe 1 and the system anchor rod 5 is completed, the construction of the primary arch centering 4 and the construction of the intermediate wall 3 are performed; after the construction of the primary arch centering 4 and the construction of the intermediate wall 3 are finished, C30 concrete is sprayed on the primary arch centering 4 and the intermediate wall 3, and the primary arch centering 4 and the intermediate wall 3 are sealed;
s300, repeating the excavation and supporting construction process of the part A, and sequentially performing excavation construction on the part B, the part C and the part D;
s400, excavating the part E, the part F, the part G and the part H in sequence by adopting a short step method; and (3) when the bottommost part G and the bottommost part H are excavated, clearing the bottom, performing bottom plate arch construction after clearing the bottom, spraying concrete to seal the whole section into a ring, and sequentially removing the intermediate wall 3.
Optionally, the construction direction of the inclined tunnel is that excavation construction is performed from top to bottom along the trend of the inclined tunnel.
Optionally, in the construction cycle of the part A to the part H, construction advances by 0.8m per cycle.
Optionally, during the weak blasting construction, 8 air leg rock drills are used for drilling, and the drilling direction is parallel to the trend of the inclined tunnel.
In the construction method of the inclined tunnel in the embodiment, the construction of the inclined tunnel is carried out by adopting a method of combining the step method and the related thought of the partition wall in the CD method, and meanwhile, the corresponding support system is carried out, so that the successful construction of the inclined tunnel is greatly ensured, and the safety and the efficiency of passengers entering and exiting the underground deep-buried station are improved. The procedures of construction and excavation of each part are not affected mutually, and the construction quality is ensured and the construction progress is accelerated by one-time complete construction. The construction period can be effectively shortened, and the consumption of manpower and material resources is greatly reduced.
The inclined tunnel construction method has small safety risk in the construction of the inclined tunnel, has few excavation procedures and is more beneficial to mechanical excavation; reaches the leading level in China and the top level in the world, and has application prospect of popularization to home and abroad. The special combination of the five parts of the primary support, the middle partition wall support, the sprayed concrete support and the prestressed anchor rod is used for bearing the load of the surrounding rock, so that the construction is safe, and the efficiency is improved. The intermediate wall can also be used as a temporary support during construction.
Example 2
The embodiment provides a construction method of an inclined tunnel, particularly when a weathered trench is constructed, the method comprises the steps of S100, S200, S300, S400, S500, S600, S700 and S800.
Step S100, dividing the section of the inclined tunnel into four layers and eight parts for reverse excavation construction by adopting a method of combining a step method layering thought with a CD method mid-partition wall related thought, wherein the eight parts comprise a part A, a part B, a part C, a part D, a part E, a part F, a part G and a part H, the part A and the part B are arranged on a first layer, the part C and the part D are arranged on a second layer, the part E and the part F are arranged on a third layer, and the part G and the part H are arranged on a fourth layer, as shown in figure 1; the construction sequence is the sequence of the letters in fig. 1, and the letters a-H in fig. 1 are part a-part H;
s200, excavating the part A by using a weak blasting method, spraying concrete with the thickness of 5cm on a rock wall to seal a tunnel face after excavating, and constructing a foot locking anchor pipe 1 and a system anchor rod 5; as shown in fig. 3 and 4, after the construction of the locking anchor pipe 1 and the system anchor rod 5 is completed, the construction of the primary arch centering 4 and the construction of the intermediate wall 3 are performed; after the construction of the primary arch centering 4 and the construction of the intermediate wall 3 are finished, C30 concrete is sprayed on the primary arch centering 4 and the intermediate wall 3, and the primary arch centering 4 and the intermediate wall 3 are sealed;
s300, repeating the excavation and supporting construction process of the part A, and performing excavation construction on the part B;
s400, after the excavation and supporting construction of the part A and the part B is finished, laying a cover plate main rib 71 on the ground at the top of the excavation surface of the inclined tunnel of the weathering groove section;
step S500, arranging a grouting sleeve valve pipe 2 between the cover plate main rib 71 and the primary support arch frame 4, wherein the upper end of the grouting sleeve valve pipe 2 is connected with the cover plate main rib 71 in a welding mode, and the lower end of the grouting sleeve valve pipe is connected with the primary support arch frame 4 through an L-shaped steel rib 6, as shown in figure 2;
and S600, grouting is conducted in the grouting sleeve valve pipe 2, the excavated surface of the inclined tunnel is reinforced, then grouting is conducted in the area where the cover plate main ribs 71 are arranged, and the cover plate 7 is formed through hardening.
S700, repeating the excavation and supporting construction process of the part A, and sequentially performing excavation construction on the part C and the part D;
s800, excavating the part E, the part F, the part G and the part H in sequence by adopting a short step method; and (3) when the bottommost part G and the bottommost part H are excavated, clearing the bottom, performing bottom plate arch construction after clearing the bottom, spraying concrete to seal the whole section into a ring, and sequentially removing the intermediate wall 3.
Optionally, the intermediate wall 3 and the primary arch 4 are both made of I22a steel.
Optionally, as shown in fig. 5, the thickness of the cover plate 7 is 20cm, the cover plate main ribs 71 are C20 steel bars with a spacing of 0.15cm × 0.15cm, and the diameter of the cover plate main ribs 71 is 14 mm.
A plurality of bores are arranged in a 2.0m × 2.0m quincunx in the cover plate 7. Bore diameter of
Each drill hole is internally provided with 5
The grouting sleeve valve pipe 2 is a seamless steel pipe, the front end of the first grouting sleeve valve pipe 2 in each drilling hole is provided with a tip, 2 slurry overflow holes of 8mm are arranged in each grouting sleeve valve pipe 2 at intervals of 50cm, the slurry overflow holes are wrapped by rubber valve sleeves, and each grouting sleeve valve pipe 2 is made of a seamless steel pipe
The outer sleeve is connected by full welding.
Optionally, as shown in fig. 6, the bottom of the grouting sleeve valve pipe 2 is connected to the primary arch frame 4 through an L-shaped steel bar 6, one end of the L-shaped steel bar 6 is welded to the bottom of the grouting sleeve valve pipe 2, and the other end is welded to the primary arch frame 4.
In the embodiment, the cover plate 7 is arranged on the ground at the top of the excavation surface of the inclined tunnel, and then grouting is performed between the cover plate 7 and the primary arch frame 4 through the grouting sleeve valve pipe 2, so that the ground and the excavation surface of the tunnel form a whole. The supporting structure is suspended through the integrity after surface grouting and stratum reinforcement so as to ensure the stability and safety of the construction process.
Example 3
The embodiment provides a construction supporting system for an inclined tunnel, which comprises an inclined tunnel, a primary arch frame 4, an intermediate wall 3, a foot-locking anchor pipe 1 and a system anchor rod 5, wherein the primary arch frame 4 is arranged on the inner wall of the inclined tunnel; the intermediate wall 3 is arranged in the middle of the inclined tunnel, and the top of the intermediate wall 3 is connected with the lower surface of the primary arch frame 4; one end of the locking anchor pipe 1 is connected with the outer surface of the primary arch centering 4, and the other end is arranged in the rock wall outside the primary arch centering 4; one end of the system anchor rod 5 is connected with the outer surface of the primary arch centering 4, and the other end of the system anchor rod is arranged in the rock wall outside the primary arch centering 4.
Optionally, a cover plate 7 is arranged on the ground at the top of the excavation face of the inclined tunnel, a grouting sleeve valve pipe 2 is arranged between the cover plate 7 and the primary arch frame 4, one end of the grouting sleeve valve pipe 2 is connected with a cover plate main rib 71 of the cover plate 7, and the other end of the grouting sleeve valve pipe is connected with the primary arch frame 4.
Optionally, a plurality of grouting sleeve valve pipes 2 are arranged, and the plurality of grouting sleeve valve pipes 2 are arranged in a quincunx manner.
Optionally, the bottom of the grouting sleeve valve pipe 2 is connected with the primary arch frame 4 through an L-shaped steel bar 6, one end of the L-shaped steel bar 6 is welded to the bottom of the grouting sleeve valve pipe 2, and the other end of the L-shaped steel bar is welded to the primary arch frame 4.
The intermediate wall 3 is arranged in the primary arch centering 4 and is arranged along the longitudinal direction of the primary arch centering 4. The primary arch frame 4 and the intermediate wall 3 are formed by connecting a plurality of units formed by welding I-shaped steel I22a and connecting steel plates, the supporting frame units are prefabricated on site, the units are connected by bolts, and welding seams at joints are strictly performed according to the relevant requirements of steel structures. The primary arch centering 4 is erected after the concrete of 4cm is sprayed for the first time, and the concrete is sprayed again to the preset thickness designed by the drawing immediately after the erection is finished, so that the collapse of the arch wall is prevented. Adjacent primary arch centering 4 are connected by phi 20 longitudinal steel bars, and the circumferential distance of one side is 1m, and the inside and the outside are arranged in a staggered manner. The primary arch centering 4 is positioned and anchored by the lock pin anchor pipe 1, the welding between the primary arch centering 4 and the lock pin anchor pipe 1 is firm, the primary arch centering 4 is closely attached to the surface of primary sprayed concrete, and the gap is firmly wedged by the concrete cushion block.
The implementation principle and the generated technical effects of the supporting system provided by the embodiment of the invention are the same as those of the method embodiment, and for the sake of brief description, the corresponding contents in the method embodiment can be referred to where the embodiment of the supporting system is not mentioned.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of constructing an inclined tunnel, the method comprising:
dividing the section of the inclined tunnel into four layers and eight parts for reverse excavation construction, wherein the eight parts comprise a part A, a part B, a part C, a part D, a part E, a part F, a part G and a part H, the part A and the part B are arranged on a first layer, the part C and the part D are arranged on a second layer, the part E and the part F are arranged on a third layer, and the part G and the part H are arranged on a fourth layer;
excavating the part A by using a weak blasting method, spraying concrete with the thickness of 5cm on the rock wall to seal the tunnel face after excavating, and constructing a foot locking anchor pipe (1) and a system anchor rod (5); after the construction of the locking anchor pipe (1) and the system anchor rod (5) is finished, the construction of a primary arch frame (4) and the construction of a partition wall (3) are carried out; after the construction of the primary arch frame (4) and the construction of the partition wall (3) are finished, concrete is sprayed to the primary arch frame (4) and the partition wall (3), and the primary arch frame (4) and the partition wall (3) are sealed;
the excavation and supporting construction process of the part A is repeated, and excavation construction is sequentially carried out on the part B, the part C and the part D;
excavating the part E, the part F, the part G and the part H in sequence by a short step method; and (3) when the bottommost part G and the bottommost part H are excavated, clearing the bottom, then constructing a bottom plate arch center, spraying concrete to seal the whole section into a ring, and sequentially dismantling the intermediate wall (3).
2. The inclined tunnel construction method according to claim 1, wherein: the construction direction of the inclined tunnel is that excavation construction is carried out from top to bottom along the trend of the inclined tunnel.
3. The inclined tunnel construction method according to claim 1, wherein: in the construction cycle of the part A to the part H, the construction advances 0.8m per cycle.
4. The inclined tunnel construction method according to claim 1, wherein: and during the construction by the weak blasting method, 8 air-leg rock drills are used for drilling holes, and the drilling direction is parallel to the trend of the inclined tunnel.
5. The inclined tunnel construction method according to claim 1, wherein: the intermediate wall (3) and the primary arch centering (4) are both made of I22a section steel.
6. The inclined tunnel construction method according to claim 1, wherein in the inclined tunnel construction of the weathering groove section, the method further comprises:
after the excavation and supporting construction of the part A and the part B is finished, laying cover plate main ribs (71) on the ground at the top of the excavation surface of the inclined tunnel of the weathering groove section;
a grouting sleeve valve pipe (2) is arranged between the cover plate main rib (71) and the primary support arch (4), the upper end of the grouting sleeve valve pipe (2) is connected with the cover plate main rib (71), and the lower end of the grouting sleeve valve pipe is connected with the primary support arch (4);
grouting is conducted into the grouting sleeve valve pipe (2), the excavated surface of the inclined tunnel is reinforced, then grouting is conducted into the area where the cover plate main rib (71) is arranged, and the cover plate (7) is formed through hardening.
7. A sloped tunnel construction support system, comprising:
inclining the tunnel;
the primary support arch (4), the primary support arch (4) is arranged on the inner wall of the inclined tunnel;
the intermediate wall (3) is arranged in the middle of the inclined tunnel, and the top of the intermediate wall (3) is connected with the lower surface of the primary arch frame (4);
one end of the locking anchor pipe (1) is connected with the outer surface of the primary arch centering (4), and the other end of the locking anchor pipe (1) is arranged in a rock wall on the outer side of the primary arch centering (4); and
and one end of the system anchor rod (5) is connected with the outer surface of the primary arch centering (4), and the other end of the system anchor rod (5) is arranged in the rock wall outside the primary arch centering (4).
8. The inclined tunnel construction support system according to claim 7, wherein: the top of the excavation face of the inclined tunnel is provided with a cover plate (7) on the ground, a grouting sleeve valve pipe (2) is arranged between the cover plate (7) and the primary arch centering (4), one end of the grouting sleeve valve pipe (2) is connected with a cover plate main rib (71) of the cover plate (7), and the other end of the grouting sleeve valve pipe is connected with the primary arch centering (4).
9. The inclined tunnel construction support system according to claim 8, wherein: the grouting sleeve valve pipes (2) are arranged in a plurality, and the grouting sleeve valve pipes (2) are arranged in a quincunx manner.
10. The inclined tunnel construction support system according to claim 8, wherein: the bottom of the grouting sleeve valve pipe (2) is connected with the primary arch frame (4) through an L-shaped steel bar (6), one end of the L-shaped steel bar (6) is connected with the bottom of the grouting sleeve valve pipe (2) in a welding mode, and the other end of the L-shaped steel bar is connected with the primary arch frame (4) in a welding mode.
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| CN202011004898.1A CN112228077A (en) | 2020-09-22 | 2020-09-22 | Inclined tunnel construction method and support system thereof |
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| CN202011004898.1A CN112228077A (en) | 2020-09-22 | 2020-09-22 | Inclined tunnel construction method and support system thereof |
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