CN107060876B - Steel pipe concrete pier column gob-side entry retaining active supporting structure and construction method thereof - Google Patents
Steel pipe concrete pier column gob-side entry retaining active supporting structure and construction method thereof Download PDFInfo
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- CN107060876B CN107060876B CN201710383198.XA CN201710383198A CN107060876B CN 107060876 B CN107060876 B CN 107060876B CN 201710383198 A CN201710383198 A CN 201710383198A CN 107060876 B CN107060876 B CN 107060876B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 145
- 239000010959 steel Substances 0.000 title claims abstract description 145
- 238000010276 construction Methods 0.000 title claims abstract description 34
- 239000000839 emulsion Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002002 slurry Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 241001669679 Eleotris Species 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a steel pipe concrete pier column gob-side entry retaining active supporting structure and a construction method thereof. Wherein the steel pipe concrete pier column positioned at one side of the working face goaf is formed by combining steel pipes and concrete. The emulsion pump station provides power for a hydraulic jack arranged at the top of the steel pipe through an emulsion conveying pipe. The method comprises the following steps: constructing a concrete filled steel tube pier column according to design requirements; installing and adjusting the position of a hydraulic jack; and starting the emulsion pump station to apply pressure for the first time. And circulating the steps until all the steel tube concrete pier column active supporting structures have the initial supporting force of 1 MPa. After one day of interval, all hydraulic jacks are pressurized for the second time, and the pressurization is stopped when the reading of the pressure gauge reaches 2 MPa. The construction process is simple, the traditional passive support mode of the concrete filled steel tube is changed into active support, and the technical and economic advantages of the concrete filled steel tube pier are fully exerted.
Description
Technical Field
The invention relates to a non-coal pillar mining roadside filling support technology, in particular to a steel tube concrete pier column gob-side entry retaining active support structure and a construction method thereof, which are used in the gob-side entry retaining roadside filling support technology.
Background
The steel pipe concrete pier column gob-side entry retaining is increasingly applied to the coal mine gob-side entry retaining roadside filling support technology by virtue of the outstanding technical and economic advantages. Compared with the traditional concrete wall roadside support, the external steel pipe of the steel pipe concrete pier column not only acts as a template in the concrete pouring process, but also provides constraint for the internal concrete, so that the internal concrete is in a three-dimensional stress state, and the strength and the ductility of the internal concrete are improved to a certain extent. Under the constraint action of the internal core concrete, the original unidirectional stress state of the external steel pipe is changed into a bidirectional stress state, and the mechanical characteristics of the external steel pipe are effectively exerted. Therefore, the gob-side entry retaining technology for the concrete filled steel tube pier column based on the advantages of the combined structure of the steel tube and the concrete has been developed. However, the problem of the contact between the standard-sized concrete filled steel tube column and the roadway roof in the using process is not solved effectively due to the inconsistency of the heights of underground roadways. In order to achieve sufficient roof lifting, sleepers with different thicknesses are usually erected above the concrete filled steel tube pier columns to adapt to different roadway height changes. The sleeper has larger difference in strength and ductility compared with the steel pipe concrete pier column, and has adverse effect on fully playing the technical advantages of high strength and high ductility of the steel pipe concrete pier column structure. The method is characterized in that the sleeper generates larger deformation in the roof pressing process, but the bearing capacity is always at a lower level, so that the roof is sunk in a larger range at the initial stage of the entry retaining, and even the separation layer of an overlying strata is caused, thereby affecting the stability of the whole entry retaining system. On the other hand, the concrete filled steel tube pier column belongs to a passive supporting system, and cannot provide effective initial supporting force for resisting the movement of an overlying strata in the initial stage of erection, and particularly cannot provide enough initial supporting force in the initial stage of entry retaining to cut off a goaf side roof of a working face so as to form an arc triangular plate structure. In order to solve the problems of full jacking and initial supporting force of the steel pipe concrete pier, the invention provides a steel pipe concrete pier gob-side entry retaining active supporting structure and a construction method thereof, which can maximally realize full jacking of the steel pipe concrete pier and provide effective and controllable initial supporting force.
Disclosure of Invention
Technical problems: the invention aims to provide a steel pipe concrete pier column gob-side entry retaining active supporting structure capable of fully jacking and providing controllable initial supporting force and a construction method thereof, which solve the technical problem that the traditional steel pipe concrete pier column gob-side entry retaining supporting technology cannot fully jack, and simultaneously change the passive supporting mode of the traditional steel pipe concrete pier column gob-side entry retaining into active supporting, and provide the initial supporting force which can be adjusted according to actual needs.
The steel pipe concrete pier column active supporting structure comprises a steel pipe concrete pier column and a hydraulic jack, wherein the steel pipe concrete pier column consists of an external steel pipe and concrete filled in the steel pipe concrete pier column, and the diameter of the hydraulic jack is 5cm smaller than the inner diameter of a steel pipe in the steel pipe concrete pier column.
The outer steel tube of the steel tube concrete pier column realizes space sealing by welding round steel plates at the upper end and the lower end. Wherein, the upper end steel plate is welded in the position 3cm from outside steel pipe upper portion edge, and the position of vacating is used for laying hydraulic jack as the spacing groove. The top of the steel pipe is provided with a grouting hole and an exhaust hole, wherein the position of the exhaust hole is higher than that of the grouting hole, and the grouting hole is connected with a rubber hose with a one-way valve through a hollow screw.
The other end of the rubber hose with the one-way grouting valve is communicated with the concrete grouting pipe through the quick connector, air in the steel pipe is discharged through the vent hole under the action of concrete slurry pressure in the grouting process, and when continuous concrete slurry overflows from the vent hole, the steel pipe is completely filled with concrete, and grouting operation can be stopped at the moment.
The hydraulic jack device is a cylindrical hydraulic jack matched with a pressure gauge, and the cylindrical hydraulic jack can be directly placed in a limit groove with the height of 3cm reserved at the upper end head of the steel pipe.
The hydraulic jack is communicated with an emulsion pump station arranged on the roadway bottom plate through an emulsion conveying pipe, and the emulsion pump station provides power for the piston movement of the hydraulic jack.
The construction method for realizing the steel tube concrete pier column gob-side entry retaining active supporting structure comprises the following specific steps:
(1) Constructing a concrete filled steel tube pier column according to design requirements;
(2) And (3) placing the hydraulic jack in a limit groove reserved at the top of the constructed concrete filled steel tube pier column, and adjusting the position to enable the hydraulic jack to be kept horizontal with the tunnel roof as much as possible.
(3) And starting the emulsion pump station to start liquid supply. In the process of injecting the emulsion into the hydraulic jack through the emulsion conveying pipe, a pressure gauge arranged on the hydraulic jack needs to be observed at any time, when the reading of the pressure gauge reaches 1MPa, the pressurization is stopped, and the process of applying the initial supporting force for the first time is finished.
(4) And circulating the steps until all the steel tube concrete pier column active supporting structures have the initial supporting force of 1 MPa.
(5) After one day of interval, all hydraulic jacks are pressurized for the second time, and the pressurization is stopped when the reading of the pressure gauge reaches 2 MPa. So far, the construction of the whole steel tube concrete pier column active supporting structure is completed, and the reading displayed by the pressure gauge is the initial supporting force finally provided. At this time, the rubber hose connected with the grouting holes can be removed and left to be used in the next round of concrete pier column construction process.
The method for constructing the concrete filled steel tube pier column in the step (1) comprises the following steps:
A. leveling the roadway bottom plate at a preselected construction position, connecting grouting holes on the steel pipe with a rubber hose (1) through hollow screws, erecting the steel pipe connected with the rubber hose along the roadway height direction according to the positions of the grouting holes and the upward exhaust holes, and uniformly arranging 3 single hydraulic struts along the steel pipe circumferential direction, which are closely attached to the outer wall of the steel pipe, wherein the single hydraulic struts need to avoid the grouting holes and the exhaust holes so as not to influence normal grouting operation;
B. checking whether the concrete grouting pump and the concrete grouting pipe are normal. And after all the concrete grouting pipes are normal, the concrete grouting pipes are connected with the other ends of the rubber hoses through quick connectors, so that the preparation work is completed.
C. And starting a concrete grouting pump, and injecting concrete into the steel pipe. Along with the injection of the concrete slurry, air in the steel pipe is discharged through the exhaust hole, and when the continuous concrete slurry overflows from the exhaust hole reserved at the upper part of the steel pipe, the grouting is stopped.
D. And (3) removing the quick connector connected with one end of the concrete grouting pipe, and finishing the construction of the single concrete-filled steel tube pier in the gob-side entry retaining active supporting structure of the concrete-filled steel tube pier.
The installation sequence of the hydraulic jack in the step (2) can be properly adjusted according to the technical requirements of the actual construction link, and specifically comprises the following steps: if the roadway height is too high or the roof condition is complex, in order to avoid potential threat to constructors in the construction process of the hydraulic jack, the hydraulic jack can be arranged in a limit groove reserved at the top of the steel pipe in advance before the steel pipe is erected in the step (1).
In the step (5), the final initial supporting force of the secondary pressure can be adjusted according to actual engineering conditions, but the final initial supporting force applied is not higher than the synchronous strength of the concrete in the steel pipe concrete pier column, so that the artificial damage to the steel pipe concrete pier column structure is avoided. Meanwhile, if quick setting early strength concrete is used, the secondary pressure application can be started 8 hours after the construction of the concrete pier column is finished.
The invention has the beneficial effects that the traditional passive support form of the concrete filled steel tube gob-side entry retaining can be changed into active support, proper initial support force can be provided according to engineering requirements, and the invention has important significance for timely cutting off the overlying strata on the gob-side entry retaining goaf side to form an arc triangle structure. Meanwhile, the hydraulic jack arranged in the limit groove at the upper part of the steel pipe can realize good contact between the steel pipe concrete pier column and the roadway top plate on the premise of providing proper initial supporting force, so that the influence of the top plate separation layer on the overall stability of the gob-side entry retaining can be effectively avoided. In addition, the supporting manometer of hydraulic jack can real-time supervision steel pipe concrete pier stud's bearing capacity change characteristic, has reduced the extra economic cost that special setting up pressure monitoring devices produced.
Drawings
FIG. 1 is a schematic overall arrangement diagram of a steel pipe concrete pier column gob-side entry retaining active supporting structure and a construction method thereof;
FIG. 2 is a schematic diagram of the overall structure of a concrete filled steel tube pier column of the invention;
FIG. 3 is a schematic connection diagram of a steel pipe and a hydraulic jack of the steel pipe concrete pier column gob-side entry retaining active supporting structure and the construction method thereof;
FIG. 4 is a schematic diagram of a quick connection mode between grouting holes and a concrete grouting pipe of the steel pipe concrete pier column gob-side entry retaining active supporting structure and a construction method thereof;
FIG. 5 is a schematic diagram of the erection of single hydraulic prop of the active supporting structure of the gob-side entry retaining of the steel pipe concrete pier column and the construction method thereof;
in the figure: the hydraulic prop comprises a 1-roadway top plate, a 2-pressure gauge, a 3-grouting hole, a 4-quick connector, a 5-emulsion conveying pipe, a 6-concrete grouting pipe, a 7-steel pipe, 8-concrete, a 9-emulsion pump station, a 10-working face goaf, a 11-hydraulic jack, a 12-exhaust hole, a 13-rubber hose, a 14-concrete grouting pump, a 15-roadway bottom plate, a 17-round steel plate, 18-hollow screws, 19-one-way grouting valves, 20-limiting grooves and 21-single hydraulic props.
Detailed Description
The technical solutions of the present invention are described below with reference to the accompanying drawings, but the scope of the claims is not limited to the descriptions.
The invention discloses a steel tube concrete pier column gob-side entry retaining active supporting structure shown in fig. 1, which comprises a steel tube concrete pier column, a hydraulic jack (11), a concrete grouting pump (14) and an emulsion pump station (9). Wherein the steel pipe concrete pier column positioned at one side of the working face goaf (10) is formed by combining a steel pipe (7) and concrete (8). An emulsion pump station (9) and a concrete grouting pump (14) are arranged on the roadway bottom plate (15). The emulsion pump station (9) provides power for a hydraulic jack (11) provided with a pressure gauge (2) through an emulsion conveying pipe (5). The hydraulic jack (11) is arranged at the top of the steel pipe (7), and one end of the hydraulic jack is connected with the roadway top plate (1). The concrete grouting pump (14) injects concrete (8) into the steel pipe (7) through the concrete grouting pipe (6). The concrete grouting pipe (6) is connected with the rubber hose (13) through the quick connector (4), and the other end of the rubber hose (13) is connected with the grouting hole (3). When concrete slurry continuously overflows from the vent hole (12), the steel pipe (7) is completely filled with concrete (8).
As shown in fig. 2, the diameter of a hydraulic jack (11) of the steel pipe concrete pier column gob-side entry retaining active supporting structure is 5cm smaller than the inner diameter of a steel pipe (7). Two round steel plates (17) with the same size are welded at the upper end and the lower end of the steel pipe (7), wherein the round steel plate (17) at the upper end is welded at a position 3cm away from the edge of the upper part of the steel pipe (7), and the vacated position is used for placing a hydraulic jack (11). The upper end of the steel pipe (7) is provided with a grouting hole (3) and an exhaust hole (12), and the position of the exhaust hole (12) is higher than that of the grouting hole (3). In the construction process of the steel pipe concrete pier column, air in the steel pipe (7) is discharged through the exhaust hole (12). In the actual operation process, the hydraulic jack (11) provided with the pressure gauge (2) can be directly placed on the round steel plate (17) at the upper end of the steel pipe (7).
As shown in fig. 3, the hydraulic jack (11) matched with the pressure gauge (2) is placed in a limit groove (20) with the height of 3cm reserved at the top of the steel pipe (7), and the lower end of the hydraulic jack is in contact with a round steel plate (17) welded at the upper end of the steel pipe (7). Wherein the diameter of the hydraulic jack (11) is 5cm smaller than the inner diameter of the steel pipe (7).
As shown in fig. 4, the quick connection mode of the grouting hole (3) and the concrete grouting pipe (6) of the steel pipe concrete pier column gob-side entry retaining active supporting structure provided by the invention is specifically as follows: the outside of the grouting hole (3) is welded with a hollow screw (18) which can pass through concrete slurry, one end of a rubber hose (13) with built-in threads is connected with the hollow screw (18), and the other end is connected with a concrete grouting pipe (6) through a quick connector (4). The one-way liquid injection valve (19) is arranged in the middle of the rubber hose (13) to prevent the concrete slurry from flowing back.
As shown in fig. 5, the single hydraulic support (21) of the steel pipe concrete pier column gob-side entry retaining active supporting structure is tightly attached to the outer wall of a steel pipe (7) and is uniformly distributed with 3 single hydraulic support columns along the circumferential direction of the steel pipe (7).
As shown in fig. 1 to 5, the construction method of the steel pipe concrete pier column gob-side entry retaining active supporting structure mainly comprises the following steps: (1) The concrete filled steel tube pier column is constructed according to the design requirement, firstly, leveling treatment is carried out on a roadway bottom plate (15), and the grouting holes (3) are connected with the rubber hose (13) through hollow screws (18) welded on the grouting holes (3) of the steel tubes (7). And then, erecting the steel pipe (7) along the direction perpendicular to the connecting line of the roadway top plate (1) and the roadway bottom plate (15), and uniformly supporting 3 single hydraulic struts (21) along the circumferential direction of the steel pipe (7) and clinging to the outer side of the steel pipe (7). Checking whether the concrete grouting pump (14) and the concrete grouting pipe (6) are normal. After all is normal, the concrete grouting pipe (6) is connected with the rubber hose (13) through the quick connector (4) to finish the preparation work. The concrete pump (14) is started to start grouting. And stopping grouting when the continuous concrete slurry overflows through the vent hole (12) reserved at the upper part of the steel pipe (7). Removing a quick connector (4) connected with one end of a concrete grouting pipe (6), and finishing the construction of the steel pipe concrete pier in the gob-side entry retaining active supporting structure of the steel pipe concrete pier; (2) Placing a hydraulic jack (11) with a pressure gauge (2) in a limit groove (20) at the top of a steel pipe (7) in the constructed steel pipe concrete pier column, and adjusting the position to keep the hydraulic jack (11) as horizontal as possible with a roadway roof (1); and (3) starting the emulsion pump station (9) to start liquid supply. Observing a pressure gauge (2) arranged on the hydraulic jack (11) at any time in the process of injecting the emulsion into the hydraulic jack (11) through the emulsion conveying pipe (5), stopping pressurizing when the reading of the pressure gauge (2) reaches 1MPa, and ending the primary supporting force applying process; (5) And circulating the steps until all the steel tube concrete pier column active supporting structures have the initial supporting force of 1 MPa. (7) After one day of interval, the hydraulic jack (11) is pressurized for the second time, and when the reading of the pressure gauge (2) reaches 2MPa, the pressurization is stopped. So far, the construction of the whole steel tube concrete pier column active supporting structure is completed, and the final initial supporting force is provided at the moment. The installation sequence of the hydraulic jack in the step (2) can be properly adjusted according to the technical requirements of the actual construction link, and specifically comprises the following steps: if the roadway height is too high or the roof condition is complex, in order to avoid potential threat to constructors in the construction process of the hydraulic jack (11), the hydraulic jack (11) can be arranged in a limit groove (20) reserved at the top of the steel pipe (7) in advance before the steel pipe (7) is erected in the step (1). The final initial supporting force of the secondary pressure in the step (5) can be adjusted according to actual engineering conditions, but the final initial supporting force applied is not higher than the synchronous strength of the concrete (8) in the steel pipe concrete pier column, so that the artificial damage to the steel pipe concrete pier column structure is avoided. Meanwhile, if quick setting early strength concrete is used, the secondary pressure application can be started 8 hours after the construction of the concrete pier column is finished.
Claims (7)
1. Steel pipe concrete pier stud gob-side entry retaining initiative supporting construction, its characterized in that: the hydraulic jack (11) is a cylindrical hydraulic jack powered by an emulsion pump (14);
the construction method of the steel tube concrete pier column gob-side entry retaining active supporting structure comprises the following steps: (1) Firstly, leveling a roadway bottom plate (15), connecting a grouting hole (3) with a rubber hose (13) through a hollow screw (18) welded on the grouting hole (3) of a steel pipe (7), erecting the steel pipe (7) along a direction perpendicular to the connecting line of the roadway top plate (1) and the roadway bottom plate (15), uniformly supporting 3 single hydraulic struts (21) along the circumferential direction of the steel pipe (7) on the outer side of the steel pipe (7), checking whether the concrete grouting pump (14) and the concrete grouting pipe (6) are normal or not, connecting the concrete grouting pipe (6) with the rubber hose (13) through a quick connector (4) after all are normal, completing preparation work, starting a concrete pump (14), stopping grouting when continuous slurry overflows from an exhaust hole (12) reserved at the upper part of the steel pipe (7), and removing a quick connector (4) connected with one end of the concrete grouting pipe (6), wherein the steel pipe concrete pier is finished along an empty active supporting structure; (2) Placing a hydraulic jack (11) with a pressure gauge (2) in a limit groove (20) at the top of a steel pipe (7) in the constructed steel pipe concrete pier column, and adjusting the position to keep the hydraulic jack (11) as horizontal as possible with a roadway roof (1); (3) Starting an emulsion pump station (9) to start supplying liquid, observing a pressure gauge (2) arranged on the hydraulic jack (11) at any time in the process of injecting the emulsion into the hydraulic jack (11) through an emulsion conveying pipe (5), stopping pressurizing when the reading of the pressure gauge (2) reaches 1MPa, and ending the process of applying the initial supporting force for the first time; (4) The steps are circulated until all the steel tube concrete pier column active supporting structures have an initial supporting force of 1 MPa; (5) After one day of interval, the hydraulic jack (11) is pressurized for the second time, and the pressurization is stopped when the reading of the pressure gauge (2) reaches 2MPa, so that the construction of the whole steel tube concrete pier column active supporting structure is completed, and the final initial supporting force is provided at the moment.
2. The steel tube concrete pier column gob-side entry retaining active supporting structure according to claim 1, wherein: the position of the exhaust hole (12) is higher than that of the grouting hole (3), a hollow screw (18) which can pass through concrete slurry is welded on the outer side of the grouting hole (3), one end of a rubber hose (13) with built-in threads is connected with the hollow screw (18), and the other end of the rubber hose is connected with the concrete grouting pipe (6) through a quick connector (4).
3. The steel pipe concrete pier column gob-side entry retaining active supporting structure according to claim 2, wherein: the one-way liquid injection valve (19) is arranged in the middle of the rubber hose (13) to prevent the concrete slurry from flowing back.
4. The steel tube concrete pier column gob-side entry retaining active supporting structure according to claim 1, wherein: the diameter of the hydraulic jack (11) is 5cm smaller than the inner diameter of the steel pipe (7), and the hydraulic jack can be quickly connected with the steel pipe (7) of the steel pipe concrete pier column.
5. The concrete filled steel tube pier column gob-side entry retaining active supporting structure according to claim 4, wherein: the hydraulic jack (11) is powered by an emulsion pump station (9) arranged on a roadway bottom plate (15) through an emulsion conveying pipe (5).
6. A construction method for realizing the steel tube concrete pier column gob-side entry retaining active supporting structure according to claim 1, which is characterized in that: the installation sequence of the hydraulic jack in the step (2) is adjusted according to the requirements of actual construction links, and specifically comprises the following steps: if the roadway height is too high or the roof condition is complex, in order to avoid potential threat to constructors in the construction process of the hydraulic jack (11), the hydraulic jack (11) is arranged in a limit groove (20) reserved at the top of the steel pipe (7) in advance before the steel pipe (7) is erected in the step (1).
7. The construction method of the steel tube concrete pier column gob-side entry retaining active supporting structure according to claim 6, which is characterized by comprising the following steps: in the step (5), the final initial supporting force of the secondary pressing is adjusted according to actual engineering conditions, but the final initial supporting force applied is not higher than the synchronous strength of the concrete (8) in the concrete filled steel tube pier column, so that the artificial damage to the concrete filled steel tube pier column structure is avoided, and if the quick setting early strength concrete is used, the secondary pressing is started 8 hours after the construction of the concrete filled steel tube pier column is finished.
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| CN201710383198.XA CN107060876B (en) | 2017-05-26 | 2017-05-26 | Steel pipe concrete pier column gob-side entry retaining active supporting structure and construction method thereof |
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| CN109595029B (en) * | 2018-11-16 | 2019-08-09 | 山东科技大学 | Goaf partial stowage supporting structure and its construction method under the conditions of tight roof |
| CN110130896A (en) * | 2019-06-26 | 2019-08-16 | 中国矿业大学 | A kind of working face pillar filling mining method |
| CN112253175B (en) * | 2020-10-27 | 2022-08-02 | 中铁十二局集团有限公司 | A model for partition wall concrete placement in double arch tunnel |
| CN117927278B (en) * | 2024-03-22 | 2024-06-04 | 山东科技大学 | Constant-resistance regulation and control monitoring device and method for steel pipe concrete pier column and construction method |
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