CN113847036A - Double-wall seat structure for deep drilling shaft after well wall bottom breaking and construction method - Google Patents
Double-wall seat structure for deep drilling shaft after well wall bottom breaking and construction method Download PDFInfo
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- CN113847036A CN113847036A CN202111243138.0A CN202111243138A CN113847036A CN 113847036 A CN113847036 A CN 113847036A CN 202111243138 A CN202111243138 A CN 202111243138A CN 113847036 A CN113847036 A CN 113847036A
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- 239000010959 steel Substances 0.000 claims description 38
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- 238000005422 blasting Methods 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 11
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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Abstract
The invention provides a double-wall seat structure for a deep drilling shaft after the shaft wall bottom is broken, which relates to the technical field of drilling construction, and the double-wall seat structure is arranged below a well wall of a drilling section and comprises the following components: the auxiliary wall seat is connected with the lower end of the well wall of the drilling section; the upper end of the transitional section well wall is connected with the lower end of the auxiliary wall seat; the main wall seat is connected with the lower end of the transition section well wall, and the main wall seat is positioned below the auxiliary wall seat; the auxiliary wall seat is thinner than the main wall seat, so that the phenomenon that the upper drilling well wall is pulled open among a plurality of sections due to the fact that the lower ingate of the drilling well shaft in the condition of a thick loose layer and a thin bedrock is damaged and repaired for a plurality of times is effectively avoided, water burst and sand burst are prevented from submerging the mine, and the possibility of accidents is reduced.
Description
Technical Field
The invention relates to the technical field of drilling construction, in particular to a double-wall seat structure for a deep drilling shaft after a shaft wall bottom is broken.
Background
After the well wall barrel of the well drilling sinks to the bottom and is filled and well-fixed, the well wall structure is in a stable stress state. When the well wall bottom is cut by adopting an explosion method, if the well wall bottom is removed at one time, the lower supporting constraint is released, the end face of the lower part of the well wall cylinder is in a suspended state, and the well wall cylinder is easy to crack or damage at the weak vertical bearing capacity between well wall sections of a well, so that the stress and the water resistance of the well wall are not good, and the safe use of the well wall is influenced.
If the upper drilling well wall is pulled apart among a plurality of sections due to the repeated damage of the ingate at the lower part of the drilling well shaft under the condition of a thick loose layer and a thin bed rock, the water burst and sand burst submerge the mine, and then the great economic loss is caused.
Disclosure of Invention
The invention aims to provide a double-wall seat structure and a construction method for breaking the well wall bottom of a deep drilling shaft, which avoid the disturbance influence and damage to the well wall of a drilling section caused by blasting vibration, deformation of the well wall of a bedrock section or ingate construction and the like during the construction of the shaft of a lower bedrock section.
In order to achieve the above purpose, the invention provides the following technical scheme: a deep-drilling wellbore breaks out double-walled seat structure behind well wall base, the below of the drilling section wall of a well is located to double-walled seat structure, includes: the auxiliary wall seat is connected with the lower end of the well wall of the drilling section; the upper end of the transitional section well wall is connected with the lower end of the auxiliary wall seat; the main wall seat is connected with the lower end of the transition section well wall, and the main wall seat is positioned below the auxiliary wall seat; wherein the thickness of the auxiliary wall seat is smaller than that of the main wall seat.
Further, in the above double-wall seat structure after the deep drilling shaft breaks the bottom of the shaft wall, the outer diameter of the shaft wall of the transition section is the same as the outer diameter of the shaft wall of the drilling section, and the inner diameter of the shaft wall of the transition section is smaller than the inner diameter of the shaft wall of the drilling section; the inner diameter of the transition section well wall is 2400mm-2600 mm; the outer diameter of the well wall of the drilling section is 2500mm-2700 mm; the wall thickness of the transition section well wall is 800mm-900 mm; the wall thickness of the well wall of the well drilling section is 700mm-800 mm.
Further, in the above-described deep-drilled wellbore bottom-breaking double-wall seat structure, the auxiliary wall seat includes a first outward protrusion and a first annular portion; the first outer convex part is arranged on the outer surface of the first annular part, the outer diameter of the first annular part is the same as that of the well drilling section well wall, the upper end of the first annular part is connected with the well drilling section well wall, and the lower end of the first annular part is connected with the transition section well wall; the longitudinal section of the first outer convex part is a first trapezoid, and the angles of the lower base angle of the first trapezoid are 45 degrees and 70 degrees respectively; the length of the upper bottom of the first trapezoid is 1700mm-1900mm, and the length of the lower bottom of the first trapezoid is 2400mm-2600 mm; the main wall seat comprises a second outer convex part and a second annular part, the second outer convex part is arranged on the outer surface of the second annular part, the outer diameter of the second annular part is the same as that of the transition section well wall, and the upper end of the second annular part is connected with the transition section well wall; the longitudinal section of the second outer convex part is a second trapezoid, the length of the upper bottom of the second trapezoid is 550-650 mm, and the length of the lower bottom of the second trapezoid is 3200-3400 mm.
Further, in the above double-wall seat structure after the deep well drilling shaft breaks the well wall bottom, the thickness of the first external convex part is 400mm-600mm, and the thickness of the second external convex part is 1000mm-1400 mm.
Further, in the double-wall seat structure for breaking the well wall bottom of the deep drilling well, the transition section well wall, the auxiliary wall seat and the main wall seat are all of reinforced concrete structures; the space between the reinforcing steel bars in the well wall of the transition section is 275mm-325 mm; the distance between the reinforcing steel bars in the auxiliary wall seat is 275mm-325 mm.
In another aspect, a method for constructing a double-wall base structure is provided, which is used for constructing the auxiliary wall base in the double-wall base structure, and comprises the following steps: s1: confirming the state of the well wall of the well drilling section; s2: the wall bottom of the well is broken in a subarea way; s3: in each subarea, continuously tunneling downwards from the broken well wall bottom of the drilling well until a space required by mounting the auxiliary wall seat is tunneled, temporarily supporting the surrounding rock, and erecting an I-shaped steel stack in the space; s4: binding steel bars on the auxiliary wall seat, and setting an auxiliary wall seat template; s5: and carrying out concrete pouring on the auxiliary wall seat.
Further, in the above-mentioned method for constructing a double wall seat structure, the confirming of the state of the wall of the drilling section includes: s11: a plurality of groups of inspection holes are arranged on the well wall of the drilling section, and the central lines of the inspection holes are vertical to the well wall of the drilling section; s12: confirming whether the inspection hole has a guniting or water spraying phenomenon; s13: when the inspection hole has a phenomenon of guniting or spraying water, the wall of the well drilling section is subjected toBehind the wallGrouting reinforcement is carried out; s14: plugging the inspection hole; wherein the inspection hole is disposed within 30m above the wall bottom of the well; the number of each group of the inspection holes is 6, the heights of the 6 inspection holes are the same, and the 6 inspection holes are arranged along the circumferential direction of the well wall of the drilling section; the height difference of two adjacent groups of inspection holes on the well wall of the drilling section is 3m-5m, and the projections of the two adjacent groups of inspection holes in the vertical direction are not coincident; the inspection hole simultaneously penetrates through the well drilling section well wall and the filling layer of the well drilling section well wall.
Further, in the above-described method for constructing a double-wall base structure, the zonal excavation of the wall bottom of the well includes: s21: establishing a rectangular coordinate system on the upper surface of the wall bottom of the drilling well, taking the circle center of the upper surface of the wall bottom of the drilling well as the origin of the rectangular coordinate system, and establishing an x axis and a y axis on the basis of the origin; s22: dividing the upper surface of the wall bottom of the well into a first area, a second area, a third area and a fourth area which are the same in area according to the rectangular coordinate system, wherein the first area is an area between 0 and-x of the function y on the rectangular coordinate system, the second area is an area between 0 and x of the function y on the rectangular coordinate system, the third area is an area between 0 and x of the function x on the rectangular coordinate system, and the fourth area is an area between 0 and-x of the function y on the rectangular coordinate system; s23: and blasting the first area, the third area, the fourth area and the second area in sequence.
Further, in the construction method of the double-wall seat structure, the thickness of each pouring of the concrete is not more than 300mm, the vibration distribution interval of the concrete is 300-400 mm, and the temperature range of the concrete entering the auxiliary wall seat template is 15-20 ℃.
Further, in the above construction method of the double-wall seat structure, the i-steel stack includes a plurality of steel beams, and upper ends of the plurality of steel beams are supported on a lower end surface of the well wall of the drilling section; and the connection mode among the steel beams is welding.
The analysis shows that the invention discloses a double-wall seat structure after the bottom of a well wall of a deep drilling shaft is broken and a construction method, which effectively avoids the phenomenon that the upper drilling shaft wall is pulled open among a plurality of sections due to the repeated damage and repair of a lower ingate of the drilling shaft positioned under the condition of a thick loose layer and a thin bedrock, prevents water burst and sand burst from submerging a mine and reduces the possibility of accidents.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural view of an auxiliary wall seat according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a main wall seat according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of the location of blastholes in the bottom of a well wall in accordance with an embodiment of the invention.
FIG. 4 is a schematic top view of the structure of a steel pallet according to an embodiment of the invention.
FIG. 5 is a schematic cross-sectional structural view of a steel pallet according to an embodiment of the present invention.
Description of reference numerals: 1. a main wall seat; 2. an auxiliary wall seat; 3. a transition section well wall; 4. a well wall of the drilling section; 5. a well wall bottom; 6. a steel pallet.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth," etc. may be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.
As shown in fig. 1-5, according to an embodiment of the present invention, there is provided a double-walled seating structure for breaking a well bottom 5 in a deep-drilled wellbore, which is provided below a well wall 4 of a drilling section, including: the auxiliary wall seat 2 is connected with the lower end of the well wall 4 of the well drilling section; the upper end of the transitional section well wall 3 is connected with the lower end of the auxiliary wall seat 2; the main wall seat 1 is connected with the lower end of the transition section well wall 3, and the main wall seat 1 is positioned below the auxiliary wall seat 2; wherein the thickness of the auxiliary wall seat 2 is smaller than that of the main wall seat 1. The auxiliary wall seat 2 is arranged above the main wall seat 1, construction can be carried out immediately after the broken well wall bottom 5, restriction of surrounding rock lithology is avoided, construction is convenient, the auxiliary wall seat 2 can support the wall bottom 5 of the well drilling well immediately after construction, and disturbance damage to the well drilling well wall due to lower part construction is reduced. The main wall seat 1 is required to be arranged in intact bedrock, the structure size is large, the construction time is long, and the main wall seat 1 is directly constructed to be unfavorable for the stress of a well wall of a well when the well wall bottom 5 is broken.
Preferably, the outer diameter of the transitional section well wall 3 is the same as the outer diameter of the drilling section well wall 4, and the inner diameter of the transitional section well wall 3 is larger than the inner diameter of the drilling section well wall 4; preferably, the inner diameter of the transition section well wall 3 is 2400mm-2600mm, optionally 2400mm, 2450mm, 2500mm, 2550mm and 2600mm, and preferably 2500 mm; preferably, the outer diameter of the well wall 4 of the drilling section is 2500mm-2700mm, optionally 2500mm, 2550mm, 2600mm, 2650mm, 2750mm, preferably 2600 mm; preferably, the wall thickness of the transition section well wall 3 is 800mm-900mm, optionally 800mm, 825mm, 850mm, 875mm, 900mm, preferably 850 mm; preferably, the wall thickness of the well wall 4 of the well section is 700mm-800mm, optionally 725mm, 750mm, 775mm, 800mm, preferably 750 mm.
The auxiliary wall seat 2 comprises a first external convex part and a first annular part; the first outer convex part is arranged on the outer surface of the first annular part, the outer diameter of the first annular part is the same as that of the well drilling section well wall 4, the upper end of the first annular part is connected with the well drilling section well wall 4, and the lower end of the first annular part is connected with the transition section well wall 3; preferably, the longitudinal section of the first convex part is trapezoidal, and the angles of the lower base angle of the first trapezoidal are 45 degrees and 70 degrees respectively; preferably, the length of the upper base of the first trapezoid is 1700mm-1900mm, preferably 1838mm, and the length of the lower base of the first trapezoid is 2400mm-2600mm, preferably 2520 mm; preferably, the main wall seat 1 includes second outer convex part and second annular portion, the second outer convex part is located the surface of second annular portion, the external diameter of second annular portion with the external diameter of changeover portion wall of a well 3 is the same, the upper end of second annular portion with the changeover portion wall of a well 3 is connected, preferably, the longitudinal section of second outer convex part is the second trapezium, the length of the trapezoidal upper base of second is 550mm-650mm, optionally 550mm, 575mm, 600mm, 625mm, 650mm, preferably 600mm, the length of the trapezoidal lower base of second is 3200mm-3400mm, optionally 3200mm, 3250mm, 3300mm, 3350mm, 3400mm, preferably 3300 mm. Preferably, the thickness of the first convex part is 400mm-600mm, optionally 400mm, 450mm, 500mm, 550mm, 600mm, preferably 500mm, the thickness of the first convex part is the height of the longitudinal section of the first convex part, represented as line AB in fig. 1, and the thickness of the second convex part is 1000mm-1400mm, optionally 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, preferably 1200 mm.
Preferably, the transition section well wall 3, the auxiliary wall seat 2 and the main wall seat 1 are all of reinforced concrete structures; the space between the reinforcing steel bars in the transition section well wall 3 is 275mm-325 mm; the distance between the reinforcing steel bars in the auxiliary wall seat 2 is 275mm-325 mm.
The invention also discloses a construction method of the double-wall seat structure, which is used for constructing the auxiliary wall seat 2 in the double-wall seat structure and comprises the following steps: s1: confirming the state of the well wall 4 of the well section; s2: the wall bottom 5 of the well is broken in a subarea way; s3: in each subarea, continuously tunneling downwards from the broken wall bottom 5 of the drilling well until the design size of the auxiliary wall base 2 is tunneled to temporarily support the surrounding rock, erecting an I-shaped steel stack in the space, and constructing 4 subareas according to the same method; s4: binding steel bars on the auxiliary wall seat 2, and setting a template of the auxiliary wall seat 2; s5: and (4) pouring concrete to the auxiliary wall seat 2.
Preferably, confirming the condition of the wellbore wall 4 of the drilling section (backfill condition) comprises: s11: a plurality of groups of inspection holes are arranged on the well wall 4 of the drilling section, and the central lines of the inspection holes are vertical to the well wall 4 of the drilling section; s12: confirming whether the inspection hole has a guniting or water spraying phenomenon; s13: when the inspection hole has a guniting or water spraying phenomenon, grouting and reinforcing the 4 walls of the well wall of the drilling section; s14: plugging the inspection hole; wherein the inspection hole is arranged within 30m above the wall bottom 5 of the well; the number of each group of the inspection holes is 6, the 6 inspection holes are identical in height, and the 6 inspection holes are arranged along the circumferential direction of the well wall 4 of the drilling section; the height difference of two adjacent groups of the inspection holes on the well wall 4 of the well drilling section is 3m-5m, and the projections of the two adjacent groups of the inspection holes in the vertical direction are not coincident; the inspection hole simultaneously passes through the drilling section well wall 4 and the filling layer of the drilling section well wall 4, construction safety can be ensured through pre-inspection of the drilling section well wall 4, and the possibility of accidents is reduced.
Preferably, said zonal breaking of said wellbore wall bottom 5 comprises: s21: establishing a rectangular coordinate system on the upper surface of the wall bottom 5 of the drilling well, taking the circle center of the upper surface of the wall bottom 5 of the drilling well as the origin of the rectangular coordinate system, and establishing an x axis and a y axis on the basis of the origin; s22: dividing the upper surface of the well wall bottom 5 into a first region, a second region, a third region and a fourth region, wherein the first region is a region between 0 and-x in the rectangular coordinate system, the second region is a region between 0 and x in the rectangular coordinate system, the third region is a region between 0 and x in the rectangular coordinate system, and the fourth region is a region between 0 and-x in the rectangular coordinate system; s23: and blasting the first area, the third area, the fourth area and the second area in sequence, and constructing according to the sequence can effectively reduce uneven stress of the well wall of the well.
Preferably, the thickness of each pouring of the concrete is not more than 300mm, the vibration distribution interval of the concrete is 300-400 mm, the temperature range of the concrete entering the template of the auxiliary wall seat 2 is 15-20 ℃, construction is performed according to the vibration distribution interval and the temperature of the concrete, and the concrete pouring can be completed better.
Preferably, the steel pallet 6 comprises a plurality of steel beams, the lower ends of which are located on the surface of the rock being tunneled; the upper ends of the steel beams are supported on the lower end surface of the well wall 4 of the drilling section; the connection mode among the steel beams is welding; and the steel pallet 6 can prevent the wall cylinder of the well drilling from being pulled and cracked and damaged due to the suspension of the lower part.
The concrete construction steps of the invention are as follows:
preparing before breaking the wall bottom 5 of the well: in the range of 30m upwards from the well wall bottom 5, six inspection holes are equidistantly drilled every 4m along the circumference of a shaft (the well wall 4 of the drilling section), the hole positions of the upper layer and the lower layer are staggered, and the hole depth penetrates through a filling layer; the inspection hole has no phenomena of guniting and water spraying, and if slurry and water flow out of the inspection hole, grouting is replenished again. All inspection holes should be sealed. After the wall is confirmed by joint inspection, no high-pressure mud and water burst or re-grouting can be performed to meet the requirements, and the bottom 5 of the well wall can be broken.
In order to ensure the construction safety, the construction method of probing and digging at the same time is adopted. Before breaking the well wall bottom 5, the inspection hole through hole in the well wall bottom 5 must be inspected, when the through hole is through, a high-pressure ball valve is arranged on the inspection hole, the hole depth is 2m, after no mud and water exist, the effect of filling the well wall bottom 5 behind the wall is inspected, and the specific method is as follows: on the wall of a well bottom 5 uses in the pit shaft as the center, 4 holes are arranged on the circle of net diameter 1.6m, the depth of each hole is 2m, 4 inspection holes are explored, when the inspection holes are drilled, the drilling depth is 400mm (diameter phi 42) and an orifice pipe and a 10MPa high-pressure ball valve are installed, then the small drill bit (diameter phi 28) is drilled to the designed depth of 2m through the orifice pipe and the high-pressure ball valve, if water or slurry is discharged, the working face is pre-grouted by a grouting pump after the slurry is discharged, and the early-stage proportioning water-cement ratio of the slurry is 1: 1. the later stage water-cement ratio is 0.75: 1, the grouting pressure is 8MPa, and the center hole of the well wall bottom 5 is placed once again after 4 inspection holes finish grouting so as to break the well wall bottom 5. When the inspection hole is drilled and the high-pressure ball valve at the bottom of the well wall 5 is opened, protective measures must be taken to prevent high-pressure mud or water from hurting people.
The design position of the auxiliary wall seat 2 is vertical height of-542.990 to-545.510 m, the thickness is 1400mm, and the bottom of the auxiliary wall seat 2 is-545.510 m. The height of the metal template for casting the concrete is 1.26m, two molds are constructed on the auxiliary wall seat 2, and the height of the two molds is 2.52 m. Because the surrounding mudstone is soaked by water for a long time, the strength and the integral stability are obviously reduced, after the bottom 5 of the well wall is broken, the surrounding rock is immediately sealed and a permanent well wall is poured to avoid the adverse effect of weathering and expansion of the mudstone on the well wall.
When the well wall bottom 5 is broken, the central welding plate of the well wall bottom 5 is firstly broken, and the space is used as a free surface of subsequent blasting, which is equivalent to a groove cavity, so that the water drainage and blasting are facilitated. And then drilling the hole at the bottom of the well wall 5, drilling the hole at the full section at one time, and blasting by multiple times.
Dividing the whole well wall bottom 5 into 8 equal parts, symmetrically blasting for four times, sealing the holes in time by using tapered wood wedges after all the holes are drilled, preventing the waste rock after the blasting for multiple times from entering the holes, removing the waste rock in time after each blasting, and cutting off steel plates, reinforcing steel bars and the like. During drilling, dense drilling holes (empty holes) are arranged at the connection position of the well wall bottom 5 and the straight-line-section well wall along the contour line, the depth is based on the well wall penetration, the empty hole interval is 200mm, and the shock absorption band is manufactured artificially in the well wall and used for reducing the transmission of explosion shock waves in the well wall so as to achieve the purposes of reducing the explosion shock and protecting the upper straight-line-section well wall. And simultaneously, after the lower part of the well wall bottom 5 and the surrounding filling layer are dug, the auxiliary wall seat 2 is formed by adopting a reinforced concrete structure.
The concrete construction sequence is as follows: removing a central welded plate of the well wall bottom 5 → drilling holes once → sequentially removing the well wall bottom 5 according to four subareas → temporarily supporting in each subarea, erecting an I-shaped steel stack → binding reinforcing steel bars, erecting a template and integrally pouring concrete after construction of the four subareas is completed.
During tunneling, a 7566 pneumatic rock drill is used for drilling holes, a 1.0m long hollow hexagonal steel drill is matched with a phi 42mm straight drill bit, high-power T220 emulsion explosive allowable for coal mines, phi 35X 400mm explosive cartridges are selected for blasting, millisecond electromagnetic detonators are detonated, and special detonators are detonated. The depth of each blast hole is 600mm, and the drill rod is marked by red paint. The blasting is divided into 8 parts along the well wall, and four times of blasting are symmetrically carried out. The method specifically comprises the steps of firstly blasting in a first area, brushing an air pick to reach a sufficient size after each blasting, clearing a solid bottom, and supporting a 11# mining I-steel lapping cross-shaped steel pallet 6 on a rock surface to the lower end face of a drilling well wall on the upper portion, wherein the I-steel lapping cross-shaped steel pallet is closely contacted with the drilling well wall. The length, the width and the height of the steel pallet 6 are 1200mm, 600mm and 2500mm, and each mining I-steel must be firmly welded to prevent other parts from collapsing and losing functions when blasting; meanwhile, the surrounding rock is temporarily supported, the anchor rods are tube seam type anchor rods, the rule is phi 45 multiplied by 1600mm, the interval row spacing is 800 multiplied by 800mm, and each anchor rod is anchored by two resin anchoring agents. The mesh is 1000mm multiplied by 1000mm and is formed by spot welding of a phi 6 mm disc circle, the mesh is 100mm multiplied by 100mm, and the overlapping length of the mesh is 150 mm. And constructing the third zone, the fourth zone and the second zone again according to the same method until the well wall bottom 5 is completely broken. Then binding steel bars, erecting a template, pouring concrete, and pouring the erected steel chopping disc serving as a part of a supporting structure into the concrete. In order to ensure the compactness of concrete stubbles, chiseling an inclined plane of 200mm multiplied by 200mm at the stubbles corresponding to the well wall 4 of the drilling section before erecting the mold, and cleaning; when concrete is poured, vibration is reinforced at the part, and influence on engineering quality due to honeycombs and pitted surfaces is prevented.
In order to reduce blasting vibration as much as possible, the part with insufficient section height is constructed by adopting an air pick.
During rock loading, an HZ-6 type center rotary rock grabbing machine is used for rock loading, the capacity of the rock grabbing machine is over 50m3/h, a lifting container is a 4m3 seat hook type waste rock bucket, the waste rock directly falls to the ground through a chute after being lifted to a waste rock dumping platform, and then the waste rock is loaded into a self-discharging automobile in a concentrated mode by a loader at regular time and is transported to a designated place to be discharged. The vertical ribs and the annular ribs used by the auxiliary wall seat 2 are all II-level spiral steel bars, are processed on the ground according to the drawn size, are drawn with red paint to be in lap joint positions, and are classified and numbered. When binding connection is carried out underground according to a design drawing, the joints are required to be arranged in a staggered mode, and the circumferential steel bar joints of the same longitudinal section are not more than 25% of the total area of the steel bars. The thickness of the steel bar protective layer is 80mm at the inner edge and 100mm at the outer edge, and the thickness is based on the center of the circumferential steel bar. The size of the ring rib lap joint is 36d, after the wall bottom 5 of the blasting well is cut off the reinforcing steel bar, a vertical rib with the length of 900mm needs to be reserved downwards at the well depth of-542.990 m and cannot be cut off, the reinforcing steel bar of the small wall seat is tied up at one time, the upper end of the vertical rib is welded and connected through a double-sided welding seam, the length of the upper lap joint is 36d, a straight thread connecting sleeve is arranged on the vertical rib at the lower end of the vertical rib and is embedded into yellow sand, and preparation is made for connecting the reinforcing steel bar in the next construction step.
The wall building of the 2 sections of the auxiliary wall seats adopts metal assembling templates, the height of the wall building section is 2.52m, after the section height of the first section is dug enough, a technical worker marks the diameter of a building ring by lime according to the designed net diameter (5.0m) of the central line of a shaft, a concrete cushion layer of 200mm is laid on the bottom of the shaft wall, a layer of yellow sand is laid, and the depth of the cutting edge is 300 mm.
The concrete stirred on the ground is conveyed by a bottom discharge type of 3m3, then is put into an ash receiving disc of a lower hanging scaffold, is symmetrically put into a mould through a conveying pipe, and is tamped by an inserted high-frequency vibrator, the thickness of the concrete poured each time is preferably not more than 300mm, the vibration distribution interval is generally 300-400 mm, the phenomena of vibration leakage and under vibration are avoided, and the occurrence of honeycombs and pitted surfaces is prevented. The temperature of the concrete entering the mold is controlled within the range of 15-20 ℃. And the subsequent main wall seat 1 is constructed according to the existing construction mode.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the phenomenon that the upper drilling well wall is pulled open among a plurality of sections due to the fact that the lower part of the drilling well shaft located under the condition of a thick loose layer and a thin bedrock is damaged by a plurality of times of ingates is effectively avoided, water burst and sand burst are prevented from submerging a mine, and the possibility of accidents is reduced. 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.
Claims (10)
1. The utility model provides a deep-well drilling pit shaft breaks double-walled seat structure behind well wall bottom, the below of the drilling section wall of a well is located to double-walled seat structure, a serial communication port, includes:
the auxiliary wall seat is connected with the lower end of the well wall of the drilling section;
the upper end of the transitional section well wall is connected with the lower end of the auxiliary wall seat;
the main wall seat is connected with the lower end of the transition section well wall, and the main wall seat is positioned below the auxiliary wall seat;
wherein the thickness of the auxiliary wall seat is smaller than that of the main wall seat.
2. The deep-drilled wellbore bottom-breaking double-wall seat structure according to claim 1, wherein the outer diameter of the transition section wellbore wall is the same as the outer diameter of the drilling section wellbore wall, and the inner diameter of the transition section wellbore wall is smaller than the inner diameter of the drilling section wellbore wall;
preferably, the inner diameter of the transition section well wall is 2400mm-2600 mm;
preferably, the outer diameter of the well wall of the well drilling section is 2500mm-2700 mm;
preferably, the wall thickness of the transition section well wall is 800mm-900 mm;
preferably, the wall thickness of the well wall of the well drilling section is 700mm-800 mm.
3. The deep-drilled wellbore behind-the-wall-bottom-broken double-wall seat structure of claim 1, wherein the secondary wall seat comprises a first external protrusion and a first annular portion; the first outer convex part is arranged on the outer surface of the first annular part, the outer diameter of the first annular part is the same as that of the well drilling section well wall, the upper end of the first annular part is connected with the well drilling section well wall, and the lower end of the first annular part is connected with the transition section well wall;
the longitudinal section of the first outer convex part is a first trapezoid, and the angles of the lower base angle of the first trapezoid are 45 degrees and 70 degrees respectively;
preferably, the length of the upper bottom of the first trapezoid is 1700mm-1900mm, and the length of the lower bottom of the first trapezoid is 2400mm-2600 mm;
preferably, the main wall seat comprises a second outer convex part and a second annular part, the second outer convex part is arranged on the outer surface of the second annular part, the outer diameter of the second annular part is the same as that of the transition section well wall, and the upper end of the second annular part is connected with the transition section well wall;
preferably, the longitudinal section of the second convex part is a second trapezoid, the length of the upper bottom of the second trapezoid is 550mm-650mm, and the length of the lower bottom of the second trapezoid is 3200mm-3400 mm.
4. The deep-drilled wellbore behind-the-borehole-bottom-wall-breaking double-wall-seat structure according to claim 3, wherein the thickness of the first outward protruding part is 400mm-600mm, and the thickness of the second outward protruding part is 1000mm-1400 mm.
5. The deep-drilled wellbore bottom-breaking rear double-wall seat structure of claim 1, wherein the transition section wellbore wall, the auxiliary wall seat and the main wall seat are all reinforced concrete structures;
the space between the reinforcing steel bars in the well wall of the transition section is 275mm-325 mm;
the distance between the reinforcing steel bars in the auxiliary wall seat is 275mm-325 mm.
6. A method of constructing a double-walled seat structure for use as the secondary seat in the double-walled seat structure of any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1: confirming the state of the well wall of the well drilling section;
s2: breaking the wall bottom of the well drilling in a partitioning manner;
s3: in each subarea, continuously tunneling downwards from the broken well wall bottom of the drilling well until a space required by mounting the auxiliary wall seat is tunneled, temporarily supporting the surrounding rock, and erecting an I-shaped steel stack in the space;
s4: binding steel bars on the auxiliary wall seat, and setting an auxiliary wall seat template;
s5: and carrying out concrete pouring on the auxiliary wall seat.
7. The method of claim 6, wherein said determining the condition of the wall of the wellbore section comprises:
s11: a plurality of groups of inspection holes are arranged on the well wall of the drilling section, and the central lines of the inspection holes are vertical to the well wall of the drilling section;
s12: confirming whether the inspection hole has a guniting or water spraying phenomenon;
s13: when the inspection hole has a phenomenon of guniting or spraying water, the wall of the well drilling section is subjected toBehind the wallGrouting reinforcement is carried out;
s14: plugging the inspection hole;
wherein the inspection hole is disposed within 30m above the wall bottom of the well;
the number of each group of the inspection holes is 6, the heights of the 6 inspection holes are the same, and the 6 inspection holes are arranged along the circumferential direction of the well wall of the drilling section;
the height difference of two adjacent groups of inspection holes on the well wall of the drilling section is 3m-5m, and the projections of the two adjacent groups of inspection holes in the vertical direction are not coincident;
the inspection hole simultaneously penetrates through the well drilling section well wall and the filling layer of the well drilling section well wall.
8. The method of claim 6, wherein the zonal breach of the borehole wall bottom comprises:
s21: establishing a rectangular coordinate system on the upper surface of the wall bottom of the drilling well, taking the circle center of the upper surface of the wall bottom of the drilling well as the origin of the rectangular coordinate system, and establishing an x axis and a y axis on the basis of the origin;
s22: dividing the upper surface of the wall bottom of the well into a first area, a second area, a third area and a fourth area which are the same in area according to the rectangular coordinate system, wherein the first area is an area between 0 and-x of the function y on the rectangular coordinate system, the second area is an area between 0 and x of the function y on the rectangular coordinate system, the third area is an area between 0 and x of the function x on the rectangular coordinate system, and the fourth area is an area between 0 and-x of the function y on the rectangular coordinate system;
s23: and blasting the first area, the third area, the fourth area and the second area in sequence.
9. The construction method of a double-wall seat structure according to claim 6, wherein the thickness of each pouring of the concrete is not more than 300mm, the vibration distribution interval of the concrete is 300-400 mm, and the temperature of the concrete entering the auxiliary wall seat formwork is 15-20 ℃.
10. A double wall seating structure construction method according to claim 6,
the I-shaped steel stack comprises a plurality of steel beams, and the upper ends of the steel beams are supported on the lower end surface of the well wall of the drilling section;
and the connection mode among the steel beams is welding.
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| CN202111243138.0A CN113847036A (en) | 2021-10-25 | 2021-10-25 | Double-wall seat structure for deep drilling shaft after well wall bottom breaking and construction method |
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