CN113944467B - Construction method for preventing collapse of shaft enclosure broken surrounding rock well wall - Google Patents
Construction method for preventing collapse of shaft enclosure broken surrounding rock well wall Download PDFInfo
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- CN113944467B CN113944467B CN202111028224.XA CN202111028224A CN113944467B CN 113944467 B CN113944467 B CN 113944467B CN 202111028224 A CN202111028224 A CN 202111028224A CN 113944467 B CN113944467 B CN 113944467B
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- 239000011435 rock Substances 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 143
- 239000010959 steel Substances 0.000 claims abstract description 143
- 238000005520 cutting process Methods 0.000 claims abstract description 54
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 23
- 238000004080 punching Methods 0.000 claims abstract description 21
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 16
- 239000004746 geotextile Substances 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 238000003466 welding Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention relates to a construction method for preventing collapse of a shaft enclosure broken surrounding rock well wall, which comprises the following steps: s1, punching a plurality of steel protection barrel pre-punching holes around the surface of the steel protection barrel, and arranging rock wall pre-punching holes corresponding to the steel protection barrel pre-punching holes one by one on the rock wall of a slag walking hole dug in advance in a vertical shaft; inserting reinforcing steel bars into the pre-punched holes of the rock wall, and ensuring that the outer ends of all the reinforcing steel bars are on the same cylindrical surface; s2, lowering the steel pile casing into the slag walking holes, and enabling the steel bars to be respectively inserted in one-to-one alignment with steel pile casing pre-punching holes of the steel pile casing; s3, filling cement mixed mortar into a gap between the steel casing and the slag walking hole; s4, cutting the steel pile casing into small blocks, and taking out the steel pile casing from the vertical shaft in a mode of taking out one small block at a time. According to the invention, the steel protective cylinder is used for reinforcing the well wall, the waterproof layer is covered on the surface of the steel protective cylinder, so that the steel protective cylinder can fall off rapidly after being cut, the construction safety of workers is ensured, the on-site construction efficiency is improved, and the construction cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for preventing collapse of a shaft wall of a vertical shaft enclosure broken surrounding rock.
Background
Along with the development of highway construction industry in China, in the construction process of highway tunnels, the design and construction schemes of long tunnels and extra-long tunnels are mature, and more highway tunnels adopt vertical shafts as ventilation schemes of the tunnels. However, when the shaft is too deep, the shaft inevitably needs to pass through the broken surrounding rock band, and collapse hidden danger exists during construction. The current shaft construction scheme has lower construction efficiency and safety under the condition.
Disclosure of Invention
The application provides a construction method for preventing collapse of a shaft enclosure broken surrounding rock well wall for solving the technical problems.
The application is realized by the following technical scheme:
a construction method for preventing collapse of a shaft wall of a vertical shaft enclosure broken surrounding rock comprises the following steps:
s1, punching a plurality of steel casing pre-holes around the surface of the steel casing, and arranging a plurality of rock wall pre-holes on the rock wall of a slag walking hole which is dug in advance in a vertical shaft, wherein the steel casing pre-holes correspond to the rock wall pre-holes one by one;
inserting reinforcing steel bars into the pre-punched holes of the rock wall, and ensuring that the outer ends of all the reinforcing steel bars are on the same cylindrical surface;
s2, lowering the steel pile casing into the slag walking holes, and enabling the steel bars to be respectively inserted in one-to-one alignment with steel pile casing pre-punching holes of the steel pile casing;
s3, filling cement mixed mortar into a gap between the steel casing and the slag walking hole;
s4, cutting the steel pile casing into small blocks, and taking out the steel pile casing from the vertical shaft in a mode of taking out one small block at a time.
In particular, the steel bars are obliquely arranged, and the upper ends of the steel bars are spliced with the steel casing.
Preferably, the cement mixed mortar is C25 cement mixed mortar, and the mixing ratio of the C25 cement mixed mortar is 1:4.5.
furthermore, lime paste and a liquid accelerator are added into the cement mixed mortar.
In particular, in the step S2, the reinforcing steel bars are arranged in multiple layers from top to bottom, and the step S3 specifically includes:
s3.1, respectively covering geotextiles above each layer of reinforcing steel bars;
s3.2, starting from the lowest layer, spraying cement mixed mortar into gaps between the upper geotextile layer, the lower geotextile layer, the steel casing and the slag walking holes layer by layer for filling and fixing.
In particular, the step S4 includes the steps of:
s4.1, horizontally cutting the upper end of the steel casing, so that the upper end of the steel casing is cut and separated to form an independent annular sheet, and then longitudinally cutting the annular sheet to sequentially divide the annular sheet into a plurality of pieces along the circumferential direction;
lifting lugs are respectively arranged on each cutting piece;
s4.2, connecting lifting lugs by using a lifting tool, and lifting and taking out the cutting pieces one by one;
s4.3, circulating S4.1-S4.2 until the steel casing is completely taken out.
Further, the surface of the steel casing is covered with a waterproof layer.
Compared with the prior art, the application has the following beneficial effects:
1, reinforcing and maintaining broken surrounding rock well wall sections of a vertical shaft by adopting surrounding steel bars and cement mixed mortar, so that collapse can be effectively prevented, and construction safety is improved;
2, this application covers the waterproof layer at steel casing surface, makes it can drop fast after cutting, can improve the on-the-spot efficiency of construction, does benefit to reduction in construction cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the invention.
FIG. 1 is a schematic view of a steel casing lowered; the slag is taken by a walk in the slag hole;
FIG. 2 is a schematic cross-sectional view of a steel casing;
FIG. 3 is a schematic illustration of an arrangement of steel casing pre-holes and rock wall pre-holes;
fig. 4 is a schematic view of a longitudinal section of a rebar fixing and guniting construction;
FIG. 5 is a cross-sectional view at B-B in FIG. 4;
FIG. 6 is an elevation view of the steel casing after cutting;
FIG. 7 is a rear view of the steel casing after cutting;
FIG. 8 is a top view of the steel casing after cutting;
FIG. 9 is a large sample of a cut sheet;
in the figure: 1-electric windlass, 2-ground, 3-steel rope, 4-supported rock wall, 5-easy collapse well wall, 6-slag hole, 7-steel casing, 8-waterproof layer, 9-steel casing pre-punching, 10-rock wall pre-punching, 11-geotechnical cloth, 12-steel bar, 13-C25 cement mixed mortar, 14-high-capacity direct current welder, 15-air pump, 17-carbon arc gouging gun, 18-left cutting blade, 19-left two cutting blade, 20-right one cutting blade, 21-right two cutting blade, 22-lifting lug, 23-bolt structure and 24-steel wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. The components of the 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 invention, as 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, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships conventionally put in place when the inventive product is used, or directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "left one," "left two," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
The embodiment discloses a construction method for preventing collapse of a shaft enclosure broken surrounding rock well wall.
The devices needed for construction are as follows: the steel pile casting machine comprises an electric winch 1, a steel pile casing 7, steel bars 12, geotechnical cloth 11, a high-capacity direct current welding machine 14, an air pressure pump 15, copper-plated solid carbon rods and a carbon arc gouging gun 17.
As shown in fig. 1, the upper part of the vertical shaft is provided with a supported rock wall 4, a collapse-prone well wall 5 is arranged below the supported rock wall 4, and a slag-taking hole 6 is dug in the collapse-prone well wall 5 in advance.
The windlass 1, the high-capacity direct current welder 14 and the air pressure pump 15 are arranged on the ground 2 above the vertical shaft.
The high-capacity direct current welding machine 14 and the air pressure pump 15 are connected with the carbon arc gouging gun 17, and the high-capacity direct current welding machine 14 is used for providing power.
As shown in fig. 2, the outer ring of the steel casing 7 is covered with a waterproof layer 8.
The construction method comprises the following steps:
step S1, measuring the depth of a vertical shaft, and determining the diameters and the lengths of a slag walking hole 6 and a steel casing 7;
a plurality of steel casing pre-punching holes 9 are punched around the surface of the steel casing 7, a plurality of rock wall pre-punching holes 10 are arranged on the rock wall of the slag walking hole 6, and the steel casing pre-punching holes 9 are in one-to-one correspondence with the rock wall pre-punching holes 10;
the rock wall pre-punching 10 is arranged for a plurality of circles from top to bottom; the number of the rock wall pre-perforating holes 10 in each circle and the number of the circles are reasonably set according to the requirement. It should be noted that the number of the pre-holes 10 in the rock wall is preferably not less than 4 per circle, and the number of the circles is set according to the length of the slag walking hole 6. The steel casing pre-hole 9 may be a horizontal hole and the steel casing pre-hole 9 is preferably a blind hole.
Step S2, as shown in fig. 3-5, inserting reinforcing steel bars 12 into the rock wall pre-punching holes 10, and ensuring that the outer ends of all the reinforcing steel bars 12 are on the same cylindrical surface; since the pre-perforated holes 10 are arranged in a plurality of circles from top to bottom, the reinforcing steel bars 12 are inserted to form a multi-layer structure from top to bottom.
Step S3, using the electric hoist 1 to lower the steel casing 7 into the slag walking hole 6, so that the steel bars 12 are respectively aligned with the steel casing pre-punching holes 9 of the steel casing 7; the insertion of the steel bars 12 into the steel casing 7 and the pre-perforated rock wall 10 ensures that the steel casing 7 is vertical and prevents the steel casing 7 from tilting.
And S4, spraying C25 cement mixed mortar 13 to a gap between the steel casing 7 and the slag walking hole 6 by adopting a mortar spraying machine to fill and fix. In this embodiment, step S4 specifically includes:
s4.1, respectively covering geotextiles above each layer of reinforcing steel bars, wherein the geotextiles can play a role in bonding and can also be used for placing cement mixed mortar loss;
s4.2, starting from the lowest layer, spraying cement mixed mortar into gaps between the upper geotextile layer, the lower geotextile layer, the steel casing and the slag walking holes layer by layer for filling and fixing.
And S5, after the cement mixed mortar is solidified, cutting the steel casing 7 into a plurality of cutting pieces, and taking out all the cutting pieces from the vertical shaft one by one. There are two ways including:
the first mode comprises the following steps:
s5.1, as shown in fig. 6-8, performing horizontal cutting and longitudinal cutting on the upper end of the steel casing 7 by using a carbon arc gouging method by using a carbon arc gouging gun 17, so that the whole steel casing 7 is cut into a plurality of pieces, and lifting lugs 22 are respectively arranged on each cutting piece;
s5.2, the electric hoist 1 is utilized to sequentially lift the cutting pieces one by one through the lifting lugs 22, and the cutting pieces are taken out.
Mode two, including the following step:
s5.1, horizontally cutting the upper end of the steel casing 7 by using a carbon arc gouging method by using a carbon arc gouging gun 17, so that the upper end of the steel casing 7 is cut and separated to form an independent annular sheet, and then longitudinally cutting the annular sheet to sequentially divide the annular sheet into uniform multiple sheets along the circumferential direction.
The number of cutting times of the longitudinal cutting is reasonably set according to the size of the steel casing 7. Preferably, the annular sheet is cut longitudinally at least three times so that the annular sheet is divided into at least three sheets in turn along the circumferential direction;
lifting lugs 22 are respectively arranged on each cutting sheet;
s5.2, the electric hoist 1 is utilized to sequentially lift the cutting pieces one by one through the lifting lugs 22, and the cutting pieces are taken out.
S5.3, circulating S5.1-S5.2 until the steel casing 7 is completely taken out.
Wherein, the cutting times of horizontal cutting are reasonably set according to the size of the steel casing 7.
The mode is safer than the mode one.
In particular, the rock wall pre-perforation 10 is an inclined hole, and the outer end of the reinforcing steel bar 12 is higher than the insertion end, so that the included angle between the reinforcing steel bar 12 and the axial direction of the steel casing 7 is an acute angle.
Among them, the reinforcing bar 12 is preferably screw steel. The carbon arc gouging gun 17 is a circumferential air supply type gouging gun, compressed air is easy to obtain and low in cost, all-position operation can be carried out, and the flexibility and operability of manual carbon arc gouging are good, so that the carbon arc gouging can still be used at a narrow station or a part with poor accessibility.
Example two
In this example, the shaft is as deep as 290m, passes through a weathered zone, a strong weathered zone, a fully weathered zone, and contains a large number of broken down surrounding rock zones with a large number of collapse hazards. The construction method in the embodiment comprises the following steps:
s1, measuring the depth of a vertical shaft, and determining that the diameter of a slag walking hole 6 is 160cm, the length of a steel pile casing 7 is 10m, the diameter is 120cm, and the thickness is 10mm-32mm; the outer ring of the steel protective cylinder 7 is covered with a waterproof layer 8 with the thickness of 5mm, and the waterproof layer 8 is made of neoprene.
As shown in fig. 2-5, 12 circles of steel casing pre-holes 9 are punched on the surface of the steel casing 7 from top to bottom, 7 steel casing pre-holes 9 are formed in each circle, and 84 steel casing pre-holes 9 are arranged in total; the steel casing pre-punch 9 has a diameter of 40mm.
Correspondingly, 12 circles of rock wall pre-punching holes 10 are arranged on the rock wall of the slag hole 6 in the vertical shaft from top to bottom, 7 rock wall pre-punching holes 10 are uniformly arranged in each circle along the circumferential direction, and 84 rock wall pre-punching holes 10 are arranged in total, wherein the diameter of the rock wall pre-punching holes 10 is 40mm.
And S2, inserting one ends of 84 steel bars 12 into 84 rock wall pre-holes 10 respectively, enabling the outer ends of all the steel bars 12 to be on the same cylindrical surface as much as possible, and arranging the 84 steel bars in an upper layer and a lower layer of 12 layers, wherein 7 steel bars are arranged in each layer.
If the exposed lengths of the reinforcing bars 12 are inconsistent due to the depth difference of the pre-perforated holes 10 of the rock wall, the outer ends of all the reinforcing bars 12 can be on the same cylindrical surface as much as possible by adopting a welding extension or sawing mode.
Step S3, connecting the electric winch 1 with the steel protection cylinder 7 through a steel rope 3 with the diameter of 40mm, and using the electric winch 1 to lower the steel protection cylinder 7 into the slag walking hole 6;
the other ends of the steel bars 12 are manually inserted in alignment with 84 steel casing pre-holes 9 of the steel casing 7 respectively, and the included angle between the steel bars 12 and the axial direction of the steel casing 7 is 70 degrees.
And S4, covering geotextile 11 with the thickness of 20mm above each layer of reinforcing steel bars 12, and spraying cement mixed mortar from the geotextile 11 at the lowest layer to the gaps between the geotextile, the steel casing and the slag walking holes layer by layer for filling and fixing.
Step S5, cutting and lifting the steel casing after the cement mixed mortar 13 is solidified, and comprising the following steps:
s5.1, as shown in fig. 6-8, horizontally cutting the upper end of the steel casing 7 by using a carbon arc gouging method by using a carbon arc gouging gun 17, so that the upper end of the steel casing 7 is cut off to form an independent annular piece, and then longitudinally cutting the annular piece for 4 times, so that the annular piece is sequentially divided into a left cutting piece 18, a left cutting piece 19, a right cutting piece 20 and a right cutting piece 21 along the circumferential direction;
two bolt structures 23 are respectively arranged on the left cutting blade 18, the left cutting blade 19, the right cutting blade 20 and the right cutting blade 21, and then two ends of a steel wire 24 are respectively connected with the two bolt structures 23, so that a lifting lug 22 is formed.
It should be noted that there are two mounting modes of the bolt structure 23:
the first mode is welded with the steel casing 7;
and the second mode is in threaded connection with the steel casing 7, and corresponding threaded holes are reserved on the steel casing 7.
S5.2, the left cutting blade 18, the left cutting blade 19, the right cutting blade 20 and the right cutting blade 21 are sequentially extracted and taken out by connecting steel wires 24 by the electric winch 1.
S5.3, circulating S5.1-S5.2 until the steel casing 7 is completely taken out.
In this example, the steel casing 7 was cut in the horizontal direction 9 times in total, and the steel casing 7 was cut into 40 pieces in total. The diameter of the steel wires 24 is 12mm, and 40 steel wires are all arranged.
It is worth to say that the mixing ratio of C25 cement mixed mortar 13 is 1:4.5, in addition, lime paste and a liquid accelerator are added into the C25 cement mixed mortar 13, so that the workability of the mortar can be improved, the setting speed can be increased, the reinforcing steel bar is not rusted, and the construction efficiency is greatly improved.
Specifically, the horizontal spacing between the steel casing pre-holes 9 of the same circle on the steel casing 7 is 50cm respectively, and the vertical spacing between the steel casing pre-holes 9 adjacent to each other is 50cm; the horizontal spacing between the same layer of steel bars 12 is 50cm, and the vertical spacing between the upper layer of steel bars 12 and the lower layer of steel bars 12 is 50cm; the lateral spacing between the rock wall pre-holes 10 is 50cm respectively, and the vertical spacing between the rock wall pre-holes 10 is 50cm.
In particular, in S5.1, when the steel casing 7 is cut horizontally, the height of the cut annular piece is controlled to be about 1 m; when the annular sheet is longitudinally cut, the annular sheet is divided into four equal parts along the circumferential direction as much as possible.
The lateral spacing of the two bolt structures 23 on each cutting blade is 0.5m; the distance between the top surfaces of the cut pieces of the bolt structure 23 was 250cm.
The bolt structure 23 includes an M10 bolt and an M10 nut. M10 bolt and cutting piece rigid coupling, nut and bolt screw thread fit.
Wherein, copper plating solid carbon rod with diameter of 8mm is used in the carbon arc gouging gun 17.
According to the invention, the steel pile casing is utilized to carry out reinforcement construction on the well wall, the waterproof layer is covered on the surface of the steel pile casing, so that the steel pile casing can be quickly fallen off after being cut, the steel bar is inserted to prevent the steel pile casing from inclining, the construction safety of workers is ensured, the on-site construction efficiency is improved, and the construction cost is greatly reduced.
The foregoing detailed description has set forth the objectives, technical solutions and advantages of the present application in further detail, but it should be understood that the foregoing is only illustrative of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A construction method for preventing collapse of a shaft wall of a vertical shaft enclosing broken surrounding rock is characterized by comprising the following steps: the method comprises the following steps:
s1, punching a plurality of steel casing pre-holes around the surface of the steel casing, arranging a plurality of rock wall pre-holes on the rock wall of a slag walking hole which is dug in advance in a vertical shaft, wherein the rock wall pre-holes are inclined holes, and the steel casing pre-holes correspond to the rock wall pre-holes one by one;
inserting steel bars into the pre-punched holes of the rock wall, wherein the steel bars are obliquely arranged, so that the outer ends of all the steel bars are ensured to be on the same cylindrical surface;
s2, lowering the steel pile casing into the slag walking hole, so that the steel bars are respectively inserted in one-to-one alignment with the steel pile casing pre-holes of the steel pile casing, and arranging a plurality of layers of steel bars from top to bottom;
s3, filling cement mixed mortar into a gap between the steel casing and the slag walking hole;
s4, cutting the steel pile casing into small blocks, and lifting the steel pile casing out of the vertical shaft in a mode of taking out one small block at a time, wherein the steel pile casing comprises:
s4.1, horizontally cutting the upper end of the steel casing, so that the upper end of the steel casing is cut and separated to form an independent annular sheet, and then longitudinally cutting the annular sheet to sequentially divide the annular sheet into a plurality of pieces along the circumferential direction;
lifting lugs are respectively arranged on each cutting piece;
s4.2, connecting lifting lugs by using a lifting tool, and lifting and taking out the cutting pieces one by one;
s4.3, circulating S4.1-S4.2 until the steel casing is completely taken out.
2. The construction method for preventing collapse of the wall of a broken surrounding rock of a shaft enclosure according to claim 1, which is characterized by comprising the following steps: the steel bar is screw thread steel.
3. The construction method for preventing collapse of the wall of a broken surrounding rock of a shaft enclosure according to claim 1, which is characterized by comprising the following steps: the upper end of the reinforcing steel bar is spliced with the steel casing.
4. The construction method for preventing collapse of the wall of a broken surrounding rock of a shaft enclosure according to claim 1, which is characterized by comprising the following steps: the step S3 is specifically as follows:
s3.1, respectively covering geotextiles above each layer of reinforcing steel bars;
s3.2, starting from the lowest layer, spraying cement mixed mortar into gaps between the upper geotextile layer, the lower geotextile layer, the steel casing and the slag walking holes layer by layer for filling and fixing.
5. The construction method for preventing collapse of the wall of the broken surrounding rock of the shaft enclosure according to claim 1 or 4, which is characterized by comprising the following steps: the cement mixed mortar is C25 cement mixed mortar, and the mixing ratio of the C25 cement mixed mortar is 1:4.5.
6. the construction method for preventing collapse of the wall of the broken surrounding rock of the shaft enclosure according to claim 5, which is characterized by comprising the following steps: lime paste and a liquid accelerator are added into the cement mixed mortar.
7. The construction method for preventing collapse of the wall of a broken surrounding rock of a shaft enclosure according to claim 1, which is characterized by comprising the following steps: two bolt structures are arranged on the cutting piece, and then two ends of the steel wire are respectively connected with the two bolt structures, so that lifting lugs are formed.
8. The construction method for preventing collapse of the wall of the broken surrounding rock of the shaft enclosure according to any one of claims 1, 2, 3, 4, 6 and 7, which is characterized by comprising the following steps: the surface of the steel casing is covered with a waterproof layer.
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| CN202111028224.XA CN113944467B (en) | 2021-09-02 | 2021-09-02 | Construction method for preventing collapse of shaft enclosure broken surrounding rock well wall |
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| CN202111028224.XA CN113944467B (en) | 2021-09-02 | 2021-09-02 | Construction method for preventing collapse of shaft enclosure broken surrounding rock well wall |
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| CN2841963Y (en) * | 2005-09-10 | 2006-11-29 | 中国矿业大学 | Well wall reinforcing device |
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| CN113944467A (en) | 2022-01-18 |
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