CN106121658B - Freezing method sinking shaft well wall supporting structure and construction method thereof - Google Patents
Freezing method sinking shaft well wall supporting structure and construction method thereof Download PDFInfo
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- CN106121658B CN106121658B CN201610640987.2A CN201610640987A CN106121658B CN 106121658 B CN106121658 B CN 106121658B CN 201610640987 A CN201610640987 A CN 201610640987A CN 106121658 B CN106121658 B CN 106121658B
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 230000008014 freezing Effects 0.000 title claims abstract description 18
- 238000007710 freezing Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 107
- 239000010959 steel Substances 0.000 claims abstract description 107
- 238000003466 welding Methods 0.000 claims abstract description 34
- 239000004033 plastic Substances 0.000 claims abstract description 24
- 229920003023 plastic Polymers 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 4
- 239000004574 high-performance concrete Substances 0.000 claims abstract description 4
- 239000011372 high-strength concrete Substances 0.000 claims abstract description 4
- 239000004567 concrete Substances 0.000 claims description 29
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 15
- 239000004593 Epoxy Substances 0.000 claims description 9
- 239000011150 reinforced concrete Substances 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 8
- 239000002689 soil Substances 0.000 abstract description 3
- 230000005641 tunneling Effects 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A freezing method sinking shaft wall supporting structure and a construction method thereof are provided, the construction method comprises the following steps: manufacturing a plane steel plate into an arc steel plate, and reserving a water drainage hole on the arc steel plate; welding two ends of the processed anchor clamp outside the arc-shaped steel plate; laying at least one layer of plastic plate between the outer side of the circular arc-shaped steel plate and the inner side of the shaft, and binding reinforcing steel bars on the inner side of the plastic plate; assembling, aligning and welding the arc-shaped steel plates welded with the anchor clamps; and after welding, high-strength and high-performance concrete is poured between the outer side of the circular arc steel plate and the inner side of the well wall in a segmented and integral manner. The invention can be widely applied to various mine constructions, the composite well wall can bear larger water and soil pressure, and can reduce the thickness of the well wall, the tunneling section of the shaft, the freezing engineering quantity and the like, thereby reducing the total construction cost of the mine construction.
Description
Technical Field
The invention relates to the field of mine supporting structures, in particular to a freezing method sinking shaft wall supporting structure for ground pressure enlargement and a construction method thereof.
Background
The shaft is the throat part of the mine, has the characteristics of long service life and the like due to the particularity of the position, and is a construction difficulty of the mine engineering. According to statistics, the well wall damage examples of freezing method construction are frequently rare, the well wall support structure of the freezing section is damaged in the process of construction and production of the well shaft, and even a single well shaft causes serious accidents such as well flooding and the like. The freezing section well wall structure has the specific characteristics that the phenomena of cracking, breaking, damage and the like occur in different degrees, the repeated maintenance is carried out for many times, great economic loss is caused to a mine, and the safety production of the mine is seriously threatened.
Along with the increase of the mining depth, the shaft is deeper and deeper, the ground pressure is larger and larger, if the well wall structure adopts a traditional supporting structure form, the thickness of the well wall is too thick when the well wall is calculated according to the standard requirement according to the bearing of 1.0 hydrostatic pressure, and the thickness of the well wall of the deep well with large diameter is even more than 3m, so that the freezing and excavating difficulty is increased, and the investment cost is also increased.
Disclosure of Invention
The invention aims to provide a freezing sinking shaft wall supporting structure and a construction method thereof, which are used for solving various problems caused by the large thickness of the deep well wall.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a shaft wall supporting structure of a shaft sinking shaft by a freezing method comprises the following steps: manufacturing a plane steel plate into an arc steel plate, and reserving a water drainage hole on the arc steel plate; welding two ends of the processed anchor clamp outside the arc-shaped steel plate; laying at least one layer of plastic plate between the outer side of the circular arc-shaped steel plate and the inner side of the shaft, and binding reinforcing steel bars on the inner side of the plastic plate; assembling, aligning and welding the arc-shaped steel plates welded with the anchor clamps; and after welding, high-strength and high-performance concrete is poured between the outer side of the circular arc steel plate and the inner side of the well wall in a segmented and integral manner.
Preferably, in the above construction method, the thickness of the flat steel plate and the circular arc steel plate is 10mm, 16mm, 20mm, 25mm or 35 mm.
Preferably, in the above construction method, the anchor clip is formed by bending flat steel having a width of 80mm, a length of 800mm and a thickness of 20 mm.
Preferably, in the above construction method, the plastic plate is a polyethylene plastic plate having two layers.
Preferably, in the construction method, the reinforcing steel bars comprise annular ribs arranged in an annular direction and longitudinal ribs arranged in a longitudinal direction, the diameter of each annular rib is 22-32 mm, the diameter of each longitudinal rib is 20-28 mm, and the distance between every two adjacent annular ribs and the distance between every two adjacent longitudinal ribs are 200-300 mm.
Preferably, in the construction method, when the arc-shaped steel plate is welded, parallel operation between vertical welding and transverse welding is realized by adopting the technology of electro-gas welding and carbon dioxide gas shielded arc welding under a mine.
Preferably, in the construction method, each section is 500 mm-1240 mm high, the concrete strength grade adopts C80-C90, and the reinforced steel fiber concrete is poured in a partial section high mode.
Preferably, in the above construction method, the circular arc steel plate and the welding seam thereof adopt a heavy anti-corrosion coating, which includes: the surface reaches Sa2.5 grade by adopting sand blasting treatment; the primer adopts epoxy zinc-rich primer, and the thickness of the coating is 60 mu m; the intermediate layer coating adopts epoxy micaceous iron intermediate paint, and the thickness of the coating is 60 mu m; the surface coating adopts epoxy finish paint, and the thickness of the coating is 80 mu m.
Preferably, in the above construction method, 4 grouting pipes are reserved in the circular arc-shaped steel plate and the reinforced concrete or the circular arc-shaped steel plate and the reinforced steel fiber concrete, and the distance between the grouting pipes is not more than 30m in the longitudinal direction.
A freezing method sinking pit shaft wall of a well supporting construction, it includes: the plastic plate is arranged on the inner side of the well wall; the reinforcing mesh is arranged on the inner side of the plastic plate; the steel plate cylinder is arranged in parallel with the axis of the shaft and is positioned in the center of the shaft; and concrete is poured between the plastic plate and the steel plate cylinder.
The analysis shows that the invention provides a steel plate cylinder and concrete composite well wall structure, which can greatly reduce the thickness of the well wall, reduce the construction difficulty, improve the construction speed and save a large amount of investment while the well wall meets the standard requirement on water pressure calculation, so that the composite well wall formed by the steel plate cylinder and reinforced concrete (reinforced steel fiber concrete) has popularization value in the aspects of design and application of huge surface soil layers and high-ground pressure freezing well wall structures.
Drawings
Fig. 1 is a schematic cross-sectional structure view of an embodiment of a supporting structure provided by the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic view of the structure of the flat steel plate after the anchor clip is welded;
fig. 5 is a schematic structural diagram of the anchor card.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order to solve the supporting problem of the existing shaft wall, as shown in fig. 1 and fig. 2, a composite supporting form is adopted for the shaft wall on the inner side of the shaft wall 1, wherein the shaft wall 1 is the original shaft wall and comprises concrete 11 and a steel plate 12 positioned on the outer side of the concrete 11, and in short: the inner side of the well wall 1 adopts a composite supporting form of circular arc steel plates 2, anchor clamps 3 are welded on the outer sides of the circular arc steel plates 2, and reinforced concrete or reinforced steel fiber concrete (generally referred to as concrete 6) is cast in place.
The invention not only provides a freezing sinking shaft well wall supporting structure, but also provides a corresponding construction method, and for the sake of clarity and no repeated description, the construction method will be described below with reference to the supporting structure shown in fig. 1-3, and the supporting structure or the construction method is not described independently.
As shown in fig. 1 to 3, the construction method provided by the present invention comprises the following steps:
firstly, manufacturing a plane steel plate into an arc-shaped steel plate 2 on the ground, and reserving a drain hole 20 on the arc-shaped steel plate 2; and welding the processed anchor clamps 3 shown in figure 5 on the outer side (the side of the well wall 1) of the circular arc steel plate 2 as shown in figures 1-4.
The thickness of the flat or circular arc steel plate 2 is selected as required, for example, 10mm, 16mm, 20mm, 25mm, 35 mm. The height of each circular arc steel plate 2 can be 500-2000 mm, and the length is 3-5 m (before being bent into a circular arc steel plate).
Preferably, the present invention also performs a corrosion prevention treatment on the circular arc steel plate 2 before it is processed or before it is carried into a well. For example, the surface of a steel plate is subjected to sand blasting treatment to reach Sa2.5 grade and then is sprayed with paint, wherein the primer adopts epoxy zinc-rich primer, and the thickness of the coating is 60 microns; the intermediate layer coating adopts epoxy micaceous iron intermediate paint, and the thickness of the coating is 60 mu m; the surface coating adopts epoxy finish paint, and the thickness of the coating is 80 mu m. More preferably, the multi-anticorrosion coating system is also adopted for the welding seam between the circular arc steel plates 2 and the anchor clamps 3 and the welding seam between the circular arc steel plates 2 in the underground.
As shown in fig. 5, the anchor clip 3 is formed by bending flat steel having a width of 80mm, a length of 800mm and a thickness of 20mm, and the anchor clip 3 is U-shaped in a plan view. Of course, the specifications of the anchor clamps 3 are not limited to this, and in practice, the anchor clamps 3 function to: the concrete 6 and the steel plate cylinder welded by the arc-shaped steel plates 2 form an effective whole, so that the shape and the specification of the anchor clamp 3 are not limited, and the similar action of an anchor rod or an anchor cable in geotechnical engineering can be met.
Next, at least one layer of plastic plate 5 is laid inside the well wall 1, preferably, against the inside of the well wall 1, and a reinforcing mesh is bound inside the plastic plate 5.
Preferably, the plastic panel 5 is a laminated double layer, and the plastic panel 5 is a polyethylene plastic panel. The steel bar mesh on the inner side of the plastic plate 5 comprises annular bars 41 and longitudinal bars 42, wherein the annular bars 41 are steel bars with the diameter of 22-32 mm, the longitudinal bars 42 are steel bars with the diameter of 20-28 mm, the distance between every two adjacent annular bars 41 or adjacent longitudinal bars 42 is 200-300 mm, and the crossed annular bars 41 and the crossed longitudinal bars 42 are bound into a whole.
And then, the arc-shaped steel plate 2 welded with the anchor clamps 3 is conveyed to the underground, assembled and aligned in the underground, and then welded into a steel plate cylinder.
Preferably, the vertical and circumferential splicing seams of each circular arc steel plate 2 are connected by welding seams, the welding seams are automatically welded mechanically, and further, the quality of the vertical welding seams is of a second level. In order to increase the welding speed, the electrogas welding and the carbon dioxide gas shielded arc welding process can be adopted. The parallel operation between vertical welding and transverse welding can be realized, and the welding speed of the steel plate is greatly accelerated.
After each circular arc steel plate 2 is welded into a steel plate cylinder, the stress state of the concrete 6 can be changed due to the action of the steel plate cylinder in the application process, and the overall strength of the well wall is improved.
After the steel plate cylinder is welded, high-strength and high-performance concrete 6 is poured between the outer side of the circular arc steel plate 2 and the inner side of the well wall 1 in a segmented and integral mode.
That is, the above-mentioned welded steel plate cylinder is also performed in sections, and instead of pouring the concrete 6 after all the steel plate cylinders on the inner side of the shaft wall 1 are welded, the steel plate cylinder is finished in one section, and the concrete 6 is poured in one section, so that the construction is performed in sections.
Preferably, each section is 500 mm-1240 mm in height, the concrete 6 is C80-C90 in strength grade, and the reinforced steel fiber concrete is poured in a part of section height. The reinforced steel fiber concrete is formed by adding a proper amount of steel fibers into reinforced concrete, so that the tensile property of the concrete 6 can be effectively improved, and the safety of a supporting structure is integrally improved.
In the construction process, the concrete 6 has higher requirement on the strength grade, needs to be prepared by a specially-assigned person, is subjected to a physical property experiment before pouring, and is recycled for the next section.
As shown in fig. 2, 4 grouting pipes 7 with equal height and uniformly distributed circumferentially are reserved in the circular arc-shaped steel plate 2 and the concrete 6, and the distance between the grouting pipes 7 is not more than 30m along the longitudinal direction of the shaft. The grouting pipe 7 is used for grouting between walls within a proper time after the casing and building of the well wall 1 are finished. Therefore, a through hole is reserved at the position where the grouting pipe 7 is arranged on the circular arc-shaped steel plate 2, and the grouting pipe 7 is welded with the circular arc-shaped steel plate 2 when being laid.
Preferably, after the grouting is completed, in order to prevent the leakage of the grouting, a pipe plug 71 is arranged at the end of the outer end of the grouting pipe 7. Furthermore, the material of the grouting pipe 7 is phi 60X7 seamless steel pipe (YB231-70), and the thread length of the pipe plug 71 is 100 mm.
In summary, the invention provides a well wall in the construction of a shaft sinking by a freezing method, which adopts a supporting form of a steel plate cylinder and cast-in-place reinforced concrete composite well wall or a steel plate cylinder and reinforced steel fiber concrete composite well wall structure. The construction process comprises the following steps: the arc-shaped steel plate cylinder welded with the anchor clamps is used as a bearing structure of a well wall and a concrete pouring template, after a circle of arc-shaped steel plates of the well wall are butted, the arc-shaped steel plates are welded in the circumferential direction and the vertical joints to form the steel plate cylinder, then high-strength and high-performance steel bars or reinforced steel fiber concrete are cast in situ outside the arc-shaped steel plate cylinder, and after the steel plate butt joint, the welding and the concrete pouring of one section of height are completed, the construction of the next section of height is carried out.
Analysis and field tests show that the invention can be widely applied to various mine constructions, the composite well wall can bear larger water and soil pressure, and the thickness of the well wall, the tunneling section of a shaft, the freezing engineering quantity and the like can be reduced, thereby reducing the total construction cost of the mine constructions.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (6)
1. A construction method for a shaft wall supporting structure of a shaft sinking shaft by a freezing method is characterized by comprising the following steps:
manufacturing a plane steel plate into an arc-shaped steel plate, and reserving water drainage holes in the arc-shaped steel plate; welding two ends of the processed anchor clamp outside the arc-shaped steel plate;
at least one layer of plastic plate is laid between the outer side of the arc-shaped steel plate and the inner side of the well wall and clings to the inner side of the well wall, the plastic plate is a double-layer polyethylene plastic plate, a reinforcing mesh is bound on the inner side of the plastic plate, the reinforcing steel comprises annular ribs arranged in an annular mode and longitudinal ribs arranged in a longitudinal mode, the intersecting annular ribs and the longitudinal ribs are bound into a whole, the diameter of the annular ribs is 22-32 mm, the diameter of the longitudinal ribs is 20-28 mm, and the distance between every two adjacent annular ribs and the distance between every two adjacent longitudinal ribs are 200-300 mm;
conveying the arc-shaped steel plate welded with the anchor clamps to the underground, assembling, aligning and welding the arc-shaped steel plate into a steel plate cylinder in the underground, and realizing parallel operation between vertical welding and transverse welding by adopting the technology of electro-gas vertical welding and carbon dioxide gas shielded arc welding in the underground when welding the arc-shaped steel plate; after welding, high-strength and high-performance concrete is poured between the outer side of the arc-shaped steel plate and the inner side of the well wall in a segmented and integral mode, and reinforced steel fiber concrete is poured in a partial and segmented mode, wherein steel fibers are added into the reinforced concrete;
and grouting pipes are reserved in the circular arc-shaped steel plates and the reinforced concrete or the circular arc-shaped steel plates and the reinforced steel fiber concrete in an annular and uniformly distributed manner, and the distance between the grouting pipes is not more than 30m in the longitudinal direction.
2. The construction method according to claim 1, wherein the thickness of the flat steel plate and the circular arc steel plate is 10mm, 16mm, 20mm, 25mm or 35 mm.
3. The construction method according to claim 1, wherein the anchor clip is formed by bending flat steel having a width of 80mm, a length of 800mm and a thickness of 20 mm.
4. The construction method according to claim 1, wherein the height of each section is 500 mm-1240 mm, and the concrete strength grade is C80-C90.
5. The construction method according to claim 1, wherein the circular arc steel plate and the welding seam thereof adopt a heavy anti-corrosion coating, and the construction method comprises the following steps: the surface reaches Sa2.5 grade by adopting sand blasting treatment; the primer adopts epoxy zinc-rich primer, and the thickness of the coating is 60 mu m; the intermediate layer coating adopts epoxy micaceous iron intermediate paint, and the thickness of the coating is 60 mu m; the surface coating adopts epoxy finish paint, and the thickness of the coating is 80 mu m.
6. The utility model provides a freezing method sinking pit shaft wall of a well supporting construction which characterized in that includes:
the plastic plate is arranged on the inner side of the well wall and is tightly attached to the inner side of the well wall, and the plastic plate is a double-layer polyethylene plastic plate;
the reinforcing mesh is arranged on the inner side of the plastic plate and comprises annular ribs arranged in an annular mode and longitudinal ribs arranged in a longitudinal mode, the annular ribs and the longitudinal ribs which are intersected are bound into a whole, the diameter of each annular rib is 22-32 mm, the diameter of each longitudinal rib is 20-28 mm, and the distance between every two adjacent annular ribs and the distance between every two adjacent longitudinal ribs are 200-300 mm;
the steel plate cylinder is formed by welding circular arc steel plates, is parallel to the axis of the shaft and is positioned in the center of the shaft;
the reinforced steel fiber concrete is poured between the plastic plate and the steel plate cylinder, and steel fibers are added into the reinforced concrete; and grouting pipes are reserved in the circular arc-shaped steel plates and the reinforced concrete or the circular arc-shaped steel plates and the reinforced steel fiber concrete in an annular and uniformly distributed manner, and the distance between the grouting pipes is not more than 30m in the longitudinal direction.
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| CN201610640987.2A CN106121658B (en) | 2016-08-05 | 2016-08-05 | Freezing method sinking shaft well wall supporting structure and construction method thereof |
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| CN201610640987.2A CN106121658B (en) | 2016-08-05 | 2016-08-05 | Freezing method sinking shaft well wall supporting structure and construction method thereof |
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| CN106121658A CN106121658A (en) | 2016-11-16 |
| CN106121658B true CN106121658B (en) | 2020-03-27 |
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| CN109519174A (en) * | 2019-01-09 | 2019-03-26 | 东北大学 | A kind of shaft wall supporting construction |
| CN112879013B (en) * | 2021-01-27 | 2023-03-03 | 中国华冶科工集团有限公司 | Installation method of shaft inner bin |
| CN113586060A (en) * | 2021-08-27 | 2021-11-02 | 中煤西安设计工程有限责任公司 | Construction method for freezing common tunneling prefabricated well wall support |
| CN114263466B (en) * | 2021-12-20 | 2024-01-30 | 安徽理工大学 | Winter prefabrication construction temperature crack control method for well wall of well drilling in alpine region |
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| CN104747192A (en) * | 2015-01-27 | 2015-07-01 | 中国矿业大学 | Steel pipe concrete stress deformation feedback supporting structure suitable for vertical shaft |
| CN204609814U (en) * | 2015-05-12 | 2015-09-02 | 安徽理工大学 | A kind of deep thick alluvium bored shaft broken grouting orifice tube is anti-goes out device |
| CN105201514A (en) * | 2015-09-15 | 2015-12-30 | 中国矿业大学 | Water-bearing rock stratum borehole wall structure and construction method |
| CN204941579U (en) * | 2015-09-22 | 2016-01-06 | 中煤第三建设（集团）有限责任公司 | The pre-buried orifice tube of a kind of pit shaft borehole wall grouting |
| CN206111181U (en) * | 2016-08-05 | 2017-04-19 | 煤炭工业合肥设计研究院 | Freeze novel steel sheet wall of a well structure of well |
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