CN114215563A - Pier column sliding and tightening method and device and pier column assembly - Google Patents
Pier column sliding and tightening method and device and pier column assembly Download PDFInfo
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- CN114215563A CN114215563A CN202111424511.2A CN202111424511A CN114215563A CN 114215563 A CN114215563 A CN 114215563A CN 202111424511 A CN202111424511 A CN 202111424511A CN 114215563 A CN114215563 A CN 114215563A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 238000005065 mining Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 239000003245 coal Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 4
- 206010024796 Logorrhoea Diseases 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/005—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention relates to the technical field of mining equipment, and provides a pier column sliding and tightening method and device and a pier column assembly. The method comprises the following steps: s1, determining the expansion displacement position and the corresponding expansion displacement degree of the pier stud; s2, designing buffer sliding tightening devices with different buffer levels according to different expansion displacement degrees of different positions of the pier stud, and performing transverse restraint on the pier stud by using the buffer sliding tightening devices. By utilizing the pier column sliding and tightening method, device and pier column assembly, when the pier column is stressed to generate transverse deformation, the buffering sliding and tightening device cannot be instantaneously damaged, and different levels of buffering sliding and tightening devices are correspondingly arranged according to different expansion degrees of different positions of the pier column, so that the buffering effect is better, the pier column can be ensured to be in a three-dimensional stress state to the maximum extent, the transverse crushing, expansion and instability of the pier column after being subjected to axial pressure are effectively prevented, the compressive strength of the pier column is improved, the integrity and the bearing capacity of the pier column are continuously maintained, and the deformation degree of a roadway is reduced.
Description
Technical Field
The invention relates to the technical field of mining equipment, in particular to a pier column sliding and tightening method and device and a pier column assembly.
Background
The pier column can be formed by filling a prefabricated framework with concrete materials, high-water materials or other grouting materials. As a passive supporting mode of a coal mine underground roadway, the passive supporting device is convenient to manufacture and high in bearing resistance, is mainly applied to gob-side entry retaining and withdrawing roadways, and plays an important role in achieving working face coal pillar-free mining and working face recovery.
A fatal problem occurs in the application process of the underground roadway pier stud, and the pier stud is compressed and transversely deformed greatly under the action of strong dynamic pressure due to the strong mining dynamic pressure caused in the working face extraction process. Traditional pier stud integrality and stability mainly rely on pier stud surface reinforcement hoop frame, and the reinforcing bar is around the pier stud and will connect, because reinforcement hoop frame is difficult to adapt to the transverse deformation of pier stud, causes peripheral hoop frame junction fracture, inefficacy, and after the pier stud loses horizontal constraint, the cylinder easily breaks, scatters, loses the bearing capacity, and then causes the tunnel to warp greatly.
Disclosure of Invention
The invention provides a pier stud sliding and tightening method, a pier stud sliding and tightening device and a pier stud assembly, which are used for solving the defects that in the prior art, a pier stud is easy to compress and deform under the action of strong dynamic pressure, and a steel bar hoop frame is difficult to adapt to the transverse deformation of the pier stud, so that the pier stud loses transverse restraint and further a roadway deforms.
The invention provides a pier stud sliding and tightening method, which comprises the following steps:
s1, determining the expansion displacement position and the corresponding expansion displacement degree of the pier stud;
s2, designing buffer sliding tightening devices with different buffer levels according to different expansion displacement degrees of different positions of the pier stud, and utilizing the buffer sliding tightening devices to transversely restrain the pier stud.
According to the pier column slip tightening method provided by the invention, before the step S1, the method further comprises the following steps:
s0, determining coal rock mass geomechanical parameters according to mine geological conditions and production conditions, and determining parameters of the pier columns required by the pressure borne by the roadway according to the coal rock mass geomechanical parameters.
According to the pier column sliding and tightening method provided by the invention, in the step S0, the coal rock mass geomechanical parameters comprise: the situation of the construction stress and mining stress at the periphery of the roadway; the parameters of the pier stud in the step S0 include: the strength, height, diameter of the pier stud and the type of casting material.
According to the pier column sliding and tightening method provided by the invention, the step S1 specifically comprises the following steps: according to the field experiment result, the expansion displacement of the middle part and the upper part of the pier column is determined to be larger than the expansion displacement of the lower part of the pier column.
According to the pier column sliding tightening method provided by the invention, in the step S2, the buffer sliding tightening device comprises at least two strip tightening hoops, the strip tightening hoops are sleeved on the periphery of the pier column, and water drop type through holes along the length direction of the strip tightening hoops are respectively constructed at the two ends of the strip tightening hoops, so that a fastener penetrates through the water drop type through holes to connect the adjacent strip tightening hoops;
when the pier stud expands transversely, the band-shaped tightening band provides resistance and can slide along the length direction of the water drop-shaped through hole.
According to the pier column sliding tightening method provided by the invention, the buffer sliding tightening devices with different buffer levels are formed by arranging the difference of the width, the thickness and the length of the strip tightening band and arranging different rows of the water drop-shaped through holes.
The invention also provides a pier stud sliding and tightening device, which comprises: at least two banding lock rings and fastener, the both ends of banding lock ring are equipped with respectively and follow banding lock ring length direction's water droplet type through-hole, adjacent two banding lock rings water droplet type through-hole at least partial coincidence is reserved the surplus that slides, the fastener passes the coincidence in proper order water droplet type through-hole, at least two the periphery that the pier stud was located to banding lock ring cover can be followed the length direction of water droplet type through-hole slides.
According to the pier column sliding tightening device provided by the invention, the water drop type through hole comprises the arc-shaped part and the elliptic arc-shaped part, the arc-shaped part is connected with the elliptic arc-shaped part, the elliptic arc-shaped part is arranged close to the corresponding end part of the belt-shaped tightening ring relative to the arc-shaped part, and the minor axis of the elliptic arc-shaped part is equal to the diameter length of the arc-shaped part.
According to the pier column sliding tightening device provided by the invention, the water drop type through holes are arranged in one row or two rows, and the number of the strip tightening hoops is three or four.
The present invention also provides a pier stud assembly comprising: the pier column sliding and tightening device is sleeved on the periphery of the pier column body.
According to the pier column sliding and tightening method provided by the invention, the expansion displacement position and the expansion displacement degree of the pier column are judged, the buffering sliding and tightening devices with different buffering levels are designed, the buffering sliding and tightening devices can provide certain buffering resistance, so that the pier column is transversely restrained, and the buffering sliding and tightening devices with different levels can provide different sliding distances. Produce lateral deformation when the pier stud atress, the tight hoop device of buffering sliding can not destroy in the twinkling of an eye, and the tight hoop device of buffering sliding that sets up different grades according to the different inflation degree correspondence of pier stud different positions for buffering effect is better, can guarantee to the utmost that the pier stud is in three-dimensional stress state, effectively prevents the pier stud and receives horizontal garrulous bloated unstability behind the axial pressure, improves the compressive strength of pier stud, continuously keeps the integrality and the bearing capacity of pier stud, thereby reduces tunnel deformation degree.
Furthermore, the invention also provides a pier stud sliding tightening device, wherein a plurality of strip tightening hoops are arranged on the periphery of a pier stud, adjacent strip tightening hoops realize sliding through the water drop type through holes arranged at the end parts, and the strip tightening hoops slide along the water drop type through holes until the fastening pieces are restrained, so that the sliding is stopped, and the problem of fracture failure caused by excessive sliding of the strip tightening hoops is avoided. Utilize this pier stud to slide tight hoop device, when the pier stud takes place lateral expansion, can provide the buffer resistance, the confining pressure of effectual assurance pier stud to keep the integrality and the bearing capacity of pier stud continuously.
Furthermore, the invention also provides a pier stud assembly, which adopts the pier stud sliding tightening device to provide buffer resistance, so that the integrity and the bearing capacity of the pier stud are continuously maintained.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a pier column slipping and tightening method provided by the invention;
FIG. 2 is a schematic structural diagram of a first embodiment of the pier stud sliding tightening device provided by the invention;
FIG. 3 is a schematic view of an embodiment of the pier stud sliding tightening device of the present invention, which is engaged with a fastener;
FIG. 4 is a schematic structural view of a second embodiment of the pier stud sliding tightening device provided by the present invention;
FIG. 5 is a schematic structural view of a second embodiment of the pier stud sliding tightening device provided by the invention, which is matched with a fastener;
fig. 6 is a pier stud assembly provided by the present invention;
fig. 7 is a partial structural schematic view of the pier stud sliding tightening device arranged in the pier stud assembly provided by the invention;
reference numerals:
1: a pier stud body; 2: the pier stud slides and tightly hoops the device; 11: pouring materials;
21: a band-shaped tightening hoop; 22: a fastener; 23: a water drop type through hole;
231: a circular arc-shaped portion; 232: an elliptical arc-shaped portion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for tightening the pier stud by sliding is described in conjunction with fig. 1. The method comprises the following steps:
s1, determining the expansion displacement position and the corresponding expansion displacement degree of the pier stud;
s2, designing buffer sliding tightening devices with different buffer levels according to different expansion displacement degrees of different positions of the pier stud, and performing transverse restraint on the pier stud by using the buffer sliding tightening devices.
Specifically, in step S1, according to field experiments, the pier is highly susceptible to lateral expansion and displacement under uniaxial pressure, which causes instability and damage of the pier. The expansion displacement occurring at the middle and upper ends of the pier stud is most severe, while the lower portion is more gentle. According to the field experiment result, the middle part and the upper end of the pier stud are provided with the buffer sliding tightening device at a high buffer level, and the lower part of the pier stud is provided with the buffer sliding tightening device at a low buffer level, so that the different expansion displacement degrees of different positions of the pier stud are subjected to adaptive transverse constraint.
It should be understood that different cushioning levels of the cushioning slip clinch device refer to different lateral slip cushioning levels, capable of providing different lateral slip cushioning distances and providing lateral restraint forces, and that the different cushioning levels of the cushioning slip clinch device are specifically deployed in the following embodiments. Produce lateral deformation at the pier stud atress, this buffering tight hoop device that slides can correspondingly take place to slide and provide certain buffer resistance to produce different horizontal restraint to the different positions of pier stud.
According to the pier column sliding and tightening method provided by the invention, the expansion displacement position and the expansion displacement degree of the pier column are judged, the buffering sliding and tightening devices with different buffering levels are designed, the buffering sliding and tightening devices can provide certain buffering resistance, so that the pier column is transversely restrained, and the buffering sliding and tightening devices with different levels can provide different sliding distances. Produce lateral deformation when the pier stud atress, the tight hoop device of buffering sliding can not destroy in the twinkling of an eye, and the tight hoop device of buffering sliding that sets up different grades according to the different inflation degree correspondence of pier stud different positions for buffering effect is better, can guarantee to the utmost that the pier stud is in three-dimensional stress state, effectively prevents the pier stud and receives horizontal garrulous bloated unstability behind the axial pressure, improves the compressive strength of pier stud, continuously keeps the integrality and the bearing capacity of pier stud, thereby reduces tunnel deformation degree.
In one embodiment of the present invention, before step S1, the method further includes:
and S0, determining coal-rock mass geomechanical parameters according to the mine geological conditions and the production conditions, and determining parameters of the pier columns required by the pressure borne by the roadway according to the coal-rock mass geomechanical parameters. Wherein, the coal rock mass geomechanical parameters include: the situation of the construction stress and mining stress at the periphery of the roadway; the parameters of the pier column include: the strength, height, diameter of the pier stud and the type of casting material 11. The step S0 specifically includes: and evaluating the specific geology and production conditions of the mine, determining the structural stress and mining induced stress conditions around the tunnel, and determining the strength, height and diameter of the pier column required by the pressure borne by the tunnel and the type of the pouring material 11 according to the specific geomechanical parameters of the coal rock mass.
In one embodiment of the present invention, step S1 specifically includes: according to the field experiment result, the expansion displacement of the middle part and the upper part of the pier column is determined to be larger than that of the lower part of the pier column. In this embodiment, can carry out the field experiment, generally, the experimental result shows that the inflation displacement that takes place in the middle part and the upper portion of pier stud is comparatively violent, need adopt the buffering at high buffering level to slide the tight hoop device and carry out horizontal restraint, and the inflation displacement that the lower part of pier stud takes place is comparatively mild, can adopt the buffering at low buffering level to slide the tight hoop device and carry out horizontal restraint.
In one embodiment of the present invention, the buffering sliding tightening device in step S2 includes at least two band-shaped tightening hoops 21, the band-shaped tightening hoops 21 are sleeved on the circumference of the pier, and water drop type through holes 23 are respectively formed at both ends of the band-shaped tightening hoops 21 along the length direction of the band-shaped tightening hoops 21, so that the adjacent band-shaped tightening hoops 21 are connected by the fastening member 22 passing through the water drop type through holes 23; when the pier expands laterally, the band-shaped tightening band 21 provides resistance and can slide along the length of the water drop-shaped through hole 23. Specifically, the cushion slip clinch device includes a plurality of band-shaped clinchs 21, and the band-shaped clinchs 21 are connected to each other by water drop type through holes 23 at both ends and fasteners 22. It will be appreciated that the drop-shaped through-holes 23 are disposed along the length of the band-shaped clinch 21 and allow the fasteners 22 to pass therethrough. During assembly, the two strip-shaped tightening rings 21 are overlapped at the end parts, the two water drop type through holes 23 are at least partially overlapped, the sliding allowance between the two water drop type through holes 23 is guaranteed, when the pier stud is transversely expanded, the strip-shaped tightening rings 21 slide along the water drop type through holes 23, and finally the fastening pieces 22 restrain and stop sliding.
In one embodiment of the present invention, the cushioning slip band fastening means of different cushioning levels is formed by providing different arrangements of the width, thickness and length of the band-shaped band fastening 21 and different numbers of rows of the drop-shaped through holes 23. Generally, the width and thickness of the belt-shaped tightening band 21 with low sliding buffer level are smaller, the length is larger, and the water drop type through holes 23 are only arranged in one row, so that the short buffer sliding distance is realized; on the contrary, the width and thickness of the band-shaped tightening band 21 with high slip buffer level are slightly larger, the length is slightly smaller, and the water drop type through holes 23 can be arranged in two or more rows, thereby realizing longer buffer slip distance.
As shown in fig. 2 to 5, the present invention further provides a pier stud sliding tightening device 2. The device includes: at least two banding lock rings 21 and fastener 22, the both ends of banding lock ring 21 are equipped with respectively along banding lock ring 21 length direction's water droplet type through-hole 23, and the water droplet type through-hole 23 of two adjacent banding lock rings 21 is at least partially coincide and reserve the allowance of sliding, and fastener 22 passes coincident water droplet type through-hole 23 in proper order, and the periphery of pier stud is located to two at least banding lock rings 21 cover and can be followed the length direction of water droplet type through-hole 23 and slide.
Specifically, the pier slipping tightening device 2 in this embodiment is formed by connecting at least two band tightening hoops 21 through a fastener 22. In the assembling process, the two strip-shaped tightening rings 21 are at least partially overlapped at the position of the water drop-shaped through hole 23, the sliding allowance is reserved during assembling, and the sliding buffering can be guaranteed when the pier stud is transversely expanded. After the band-shaped tightening band 21 is slidably buffered for a certain distance, the band-shaped tightening band is finally restrained by the fastener 22 and stops sliding. It should be understood that the size of the fastening member 22 should be smaller than the length of the drop-shaped through hole 23, so as to ensure that the band-shaped tightening band 21 can slide along the length direction thereof (i.e., the arrangement direction of the drop-shaped through hole 23).
Further, the band-shaped tightening band 21 can be made of a band-shaped rigid material (such as iron sheet) with a certain width and thickness to realize the constraint. When pier column lateral expansion pressure is close banded lock ring 21 tensile strength, banded lock ring 21 will slide along water droplet type through-hole 23, and along with the distance increase of removing, the resistance is also bigger and bigger, but banded lock ring 21 can not break in the twinkling of an eye, can effectual assurance pier column enclose the pressure.
According to the pier column sliding tightening device 2, the plurality of strip tightening hoops 21 are arranged on the periphery of the pier column, the adjacent strip tightening hoops 21 realize sliding through the water drop type through holes 23 arranged at the end parts, the strip tightening hoops 21 slide along the water drop type through holes 23 until the fastening pieces 22 restrain, so that sliding is stopped, and the problem of fracture failure caused by excessive sliding of the strip tightening hoops 21 is solved. Utilize this pier stud to slide tight hoop device 2, when the pier stud takes place lateral expansion, can provide the buffer resistance, the confining pressure of effectual assurance pier stud to keep the integrality and the bearing capacity of pier stud continuously.
In one embodiment of the present invention, the water drop type through hole 23 includes a circular arc portion 231 and an elliptical arc portion 232, the circular arc portion 231 and the elliptical arc portion 232 are connected, and the elliptical arc portion 232 is disposed close to a corresponding end of the band-shaped clinch band 21 with respect to the circular arc portion 231, and a minor axis of the elliptical arc portion 232 is equal to a diameter length of the circular arc portion 231. In the present embodiment, the water drop type through hole 23 is formed by connecting two parts of a semicircular hole (i.e., the circular arc portion 231) and a semicircular hole (i.e., the elliptical arc portion 232), and the minor axis of the semicircular hole is the same as the diameter of the semicircular hole, thereby forming a kind of strip-shaped hole extending in the length direction of the band-shaped clinch 21. In the design, the end of the semi-elliptical hole is ensured to be closer to the end of the strip-shaped tightening band 21 (i.e. the end close to the end of the strip-shaped tightening band 21, which is the end with the small size of the water-drop-shaped through hole 23, and for convenience of explanation, is hereinafter referred to as the "small end"), when assembling, the ends of the semi-circular holes of the two water-drop-shaped through holes 23 are aligned to form a complete circular hole, and the fastening piece 22 is put into the formed complete circular hole. When the pier stud is expanded transversely, the strip-shaped tightening hoop 21 slides to enable the semi-elliptical hole to be close to the fastener 22 continuously, the strip-shaped tightening hoop 21 provides buffer resistance in the sliding process, and the farther the sliding distance is, the greater the provided buffer resistance is, and the pier stud is restrained; finally, the slip distance of the band-shaped clinch 21 is restrained by the fastener 22, that is, the band-shaped clinch 21 slips to the small end of the water drop-shaped through hole 23, and is restrained by the fastener 22, thereby stopping the slip.
It will be appreciated that the fastener 22 may be a bolt and nut combination, with the bolt inserted from the inside and the nut nested on the outside, with the outside diameter of the bolt matching the inside diameter of the semi-circular hole.
In one embodiment of the present invention, the water drop type through holes 23 are arranged in one row or two rows, and the number of the band-shaped clinch bands 21 is three or four. The number of the rows of the water drop type through holes 23 can be set according to the actual situation on site, and the number and the size of the strip-shaped tightening bands 21 are set according to different sliding buffer levels.
The concrete structure of the pier slipping tightening device 2 of different levels is explained by two embodiments.
The first embodiment is as follows:
as shown in fig. 2 and 3, the present embodiment discloses a pier slipping tightening device 2 of low slipping buffer level, which comprises three band tightening bands 21. Each strip-shaped tightening hoop 21 is made of iron sheet with the width of about 20cm and the thickness of 1-2mm, and the length of the iron sheet is 1/3 plus the lap length of 80cm of the perimeter of the section of the pier column. A single row of water drop type through holes 23 are formed in the positions, 20cm away from the end heads, of two ends of the strip-shaped tightening hoops 21, the three strip-shaped tightening hoops 21 are connected and used, the total sliding distance is 120cm, the diameter of a semicircular hole of each water drop type through hole 23 is 7cm, the long axis of each semiellipse hole is 40cm, and the short axis of each semiellipse hole is 7 cm.
The water drop type through holes 23 at two ends of two adjacent strip-shaped tightening hoops 21 are overlapped and butted to form a single-stage circular hole for inserting a bolt, and the bolt with the diameter of 7cm is inserted and screwed and fixed. When pier column lateral expansion pressure is close to the tightening tensile strength, the band-shaped tightening 21 slides to the small end along the water drop through hole 23, along with the increase of the moving distance, the resistance is also larger and larger, but the band-shaped tightening 21 can not be broken instantly, and the confining pressure of the pier column is effectively guaranteed
Example two:
as shown in fig. 4 and fig. 5, the present embodiment discloses a pier column sliding tightening device 2 with high sliding buffer level, which comprises four strip tightening hoops 21, wherein each strip tightening hoop 21 is made of iron sheet with width of about 40cm and thickness of 2-3mm, and the length is 1/4 plus upper lap length 80cm of pier column section perimeter. Two rows of water drop type through holes 23 are arranged at the positions, 20cm away from the end heads, of two ends of the strip-shaped tightening hoops 21, the four strip-shaped tightening hoops 21 are connected and used and can slide 160cm in total, the diameter of a semicircular hole of each water drop type through hole 23 is 7cm, the long axis of each semi-elliptical hole is 40cm, and the short axis of each semi-elliptical hole is 7 cm.
The water drop type through holes 23 at two ends of two adjacent strip-shaped tightening hoops 21 are overlapped and butted to form two-stage circular holes for inserting bolts, and two bolts with the diameter of 7cm are inserted and screwed and fixed.
The present invention also provides a pier stud assembly, as shown in fig. 6 and 7. This pier stud subassembly includes pier stud body 1 and the pier stud of above-mentioned embodiment tightly binds round device 2 that slides, and pier stud slides tightly binds round device 2 cover and locates the periphery of pier stud body 1, adopts foretell pier stud to slide tightly to bind round device 2 and provide the buffer resistance to continuously keep the integrality and the bearing capacity of pier stud. As shown in fig. 7, the pier stud assembly of the present embodiment employs two levels of pier stud sliding tightening devices 2, namely, a low sliding buffer level and a high sliding buffer level, which are respectively used for constraining different expansion degrees of different positions of the pier stud body 1.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A pier column sliding and tightening method is characterized by comprising the following steps:
s1, determining the expansion displacement position and the corresponding expansion displacement degree of the pier stud;
s2, designing buffer sliding tightening devices with different buffer levels according to different expansion displacement degrees of different positions of the pier stud, and utilizing the buffer sliding tightening devices to transversely restrain the pier stud.
2. The pier slipping tightening method according to claim 1, further comprising, before step S1:
s0, determining coal rock mass geomechanical parameters according to mine geological conditions and production conditions, and determining parameters of the pier columns required by the pressure borne by the roadway according to the coal rock mass geomechanical parameters.
3. The pier column slipping tightening method according to claim 2, wherein the coal rock mass geomechanical parameters in step S0 include: the situation of the construction stress and mining stress at the periphery of the roadway; the parameters of the pier stud in the step S0 include: the strength, height, diameter of the pier stud and the type of casting material.
4. The pier stud sliding tightening method according to claim 1, wherein the step S1 specifically comprises: according to the field experiment result, the expansion displacement of the middle part and the upper part of the pier column is determined to be larger than the expansion displacement of the lower part of the pier column.
5. The pier slipping tightening method according to claim 1, wherein the buffer slipping tightening device in step S2 comprises at least two band-shaped tightening rings, which are fitted around the periphery of the pier, and water drop-shaped through holes are respectively formed at both ends of the band-shaped tightening rings along the length direction of the band-shaped tightening rings, so that the adjacent band-shaped tightening rings are connected by a fastener passing through the water drop-shaped through holes;
when the pier stud expands transversely, the band-shaped tightening band provides resistance and can slide along the length direction of the water drop-shaped through hole.
6. The pier slipping clinch method of claim 5, wherein the cushion slipping clinch devices of different cushion levels are formed by setting the difference of width, thickness and length of the band-shaped clinch and setting different numbers of rows to the water drop type through holes.
7. The utility model provides a pier stud tight hoop device that slides which characterized in that includes: at least two banding lock rings and fastener, the both ends of banding lock ring are equipped with respectively and follow banding lock ring length direction's water droplet type through-hole, adjacent two banding lock rings water droplet type through-hole at least partial coincidence is reserved the surplus that slides, the fastener passes the coincidence in proper order water droplet type through-hole, at least two the periphery that the pier stud was located to banding lock ring cover can be followed the length direction of water droplet type through-hole slides.
8. The pier stud sliding tightening device according to claim 7, wherein the water drop-shaped through hole comprises an arc-shaped portion and an elliptical arc-shaped portion, the arc-shaped portion is connected with the elliptical arc-shaped portion, the elliptical arc-shaped portion is arranged close to the corresponding end portion of the band-shaped tightening ring relative to the arc-shaped portion, and the minor axis of the elliptical arc-shaped portion is equal to the diameter length of the arc-shaped portion.
9. The pier stud sliding tightening device according to claim 7, wherein the water drop-shaped through holes are arranged in one row or two rows, and the number of the strip-shaped tightening rings is three or four.
10. A pier assembly, comprising: the pier column body and the pier column sliding tightening device of any one of claims 7 to 9, wherein the pier column sliding tightening device is sleeved on the periphery of the pier column body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111424511.2A CN114215563B (en) | 2021-11-26 | 2021-11-26 | Pier column sliding tightening method and device and pier column assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111424511.2A CN114215563B (en) | 2021-11-26 | 2021-11-26 | Pier column sliding tightening method and device and pier column assembly |
Publications (2)
| Publication Number | Publication Date |
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| CN114215563A true CN114215563A (en) | 2022-03-22 |
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