CN111733810A - A awl section of thick bamboo supporting body and stock for stock - Google Patents
A awl section of thick bamboo supporting body and stock for stock Download PDFInfo
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- CN111733810A CN111733810A CN202010621474.3A CN202010621474A CN111733810A CN 111733810 A CN111733810 A CN 111733810A CN 202010621474 A CN202010621474 A CN 202010621474A CN 111733810 A CN111733810 A CN 111733810A
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- anchor rod
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title description 4
- 235000017491 Bambusa tulda Nutrition 0.000 title description 4
- 241001330002 Bambuseae Species 0.000 title description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 title description 4
- 239000011425 bamboo Substances 0.000 title description 4
- 239000010410 layer Substances 0.000 claims description 29
- 239000011435 rock Substances 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 8
- 210000001503 joint Anatomy 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 abstract description 3
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- 239000011440 grout Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 5
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- 239000011083 cement mortar Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
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- 239000003822 epoxy resin Substances 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0053—Anchoring-bolts in the form of lost drilling rods
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1607—Shapes round, e.g. circle
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/165—Shapes polygonal
- E02D2200/1657—Shapes polygonal made from single element
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1692—Shapes conical or convex
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention provides a conical cylinder bearing body for an anchor rod, which is formed by surrounding a cylinder wall, wherein a central hole formed by surrounding the cylinder wall is matched with a rod body of the anchor rod and is used for being sleeved on the rod body of the anchor rod; the cylinder wall is provided with a top, a bottom and an outer wall surface, the outer diameter of the top is smaller than that of the bottom, the outer wall surface is a conical surface, and the included angle between the conical surface and the axis of the central hole is smaller than 45 degrees. The invention also provides an anchor rod, which comprises a rod body of the anchor rod and a cone-shaped supporting body arranged on the rod body, wherein the top of the cone-shaped supporting body faces the front end of the rod body, and the conical surface faces the wall of the anchor hole. When the anchor rod is pulled, the conical surface on the conical cylinder supporting body can extrude the grouting body to the wall of the anchor hole along the normal line of the conical surface in an all-round manner at 360 degrees around the rod body axis of the anchor rod, so that the grouting body and the wall of the anchor hole generate positive pressure, the positive pressure generates frictional resistance and is converted into uplift resistance of the anchor rod, the uplift resistance is greatly improved, and the anchoring reliability and the service life are correspondingly improved.
Description
Technical Field
The invention relates to the technical field of anchor rods, in particular to a conical cylinder bearing body for an anchor rod and the anchor rod with the same.
Background
The anchor rod is widely applied to the construction of urban infrastructure, such as house construction, municipal engineering, and the construction of projects of water conservancy, hydropower, traffic, railways, mines and the like.
In the technical field of anchor rods, the anti-pulling performance of the anchor rods is very important as tension members which directly go deep into the ground. In the existing anchor rods, some anchor rods adopt bearing bodies, the bearing bodies are installed on the rod bodies of the anchor rods, and the bearing surfaces of the bearing bodies adopt planes perpendicular to the rod bodies of the anchor rods. The structural mode that the bearing surface is vertical to the central axis of the rod body of the anchor rod has the advantages that the bearing area of the bearing surface is small, the stress of the grouting body is controlled by the compressive strength of the unidirectional axis, and the mechanical strength is low, so that the anti-pulling force provided by the grouting body is small.
Disclosure of Invention
In order to solve the problems, the invention firstly provides a conical cylinder bearing body for an anchor rod, which can improve the pulling resistance and reliability of the anchor rod.
The invention firstly provides a cone-shaped supporting body for an anchor rod, wherein the cone-shaped supporting body is formed by surrounding a cylinder wall, and a central hole formed by surrounding the cylinder wall is matched with a rod body of the anchor rod and is used for being sleeved on the rod body of the anchor rod; the cylinder wall is provided with a top, a bottom and an outer wall surface, the outer diameter of the top is smaller than that of the bottom, the outer wall surface is a conical surface, and the included angle between the conical surface and the axis of the central hole is smaller than 45 degrees.
Further, the included angle between the conical surface and the axis of the central hole is less than 16 degrees.
Specifically, the wall thickness L of the top of the cylinder wall is less than or equal to 3 mm.
Specifically, the difference between the diameter of the central hole and the diameter of the rod body of the anchor rod is less than 4 mm.
The cone-shaped supporting body also has a connecting structure connected with the rod body of the anchor rod.
Specifically, the connecting structure is a weldable surface on the top of the cylinder wall or/and the bottom of the cylinder wall; or the connecting structure is an internal thread which is arranged on the hole wall of the central hole and matched with an external thread of the rod body of the anchor rod; or the cone-shaped cylinder bearing body is also provided with a connecting cylinder, the connecting cylinder is arranged at the bottom of the cylinder wall and is provided with a connecting hole communicated with the central hole in a butt joint mode, and the connecting structure is an internal thread which is arranged on the hole wall of the connecting hole and matched with the external thread of the rod body of the anchor rod.
Furthermore, a resistance reducing layer is covered on the conical surface.
Specifically, the resistance reducing layer is an oil film layer, a spraying layer, a plastic film layer or a paper layer.
The invention also provides an anchor rod, which comprises a rod body of the anchor rod and the conical cylinder bearing body, wherein the conical cylinder bearing body is sleeved on the rod body of the anchor rod, and the top of the conical cylinder bearing body faces to the front end of the rod body of the anchor rod.
The invention has the following technical effects:
the conical cylinder supporting body provided by the invention is arranged on the rod body of the anchor rod, when the anchor rod is placed in the anchor hole, the top of the conical cylinder supporting body faces the anchor rod and the front end of the rod body, and the conical surface faces the wall of the anchor hole. When the anchor rod is pulled, the conical surface on the conical barrel bearing body directly extrudes the grouting body to the wall of the anchor hole along a conical surface normal line in all directions of 360 degrees around the rod body axis of the anchor rod, so that the grouting body and the wall of the anchor hole generate positive pressure, the positive pressure generates frictional resistance and is converted into the anti-pulling force of the anchor rod, and the anti-pulling force is greatly improved;
the cone-shaped supporting body changes the traditional thinking mode, changes the stress condition and the force transmission mechanism among the supporting body, the grouting body and the soil layer or rock layer of the wall of the anchor hole, utilizes the conical surface to extrude the grouting body to the wall of the anchor hole along the normal direction, has large area of the conical surface, ensures that the grouting body is in a multidirectional stress state, improves the mechanical strength and improves the pulling resistance of the anchor rod.
The anchor rod adopting the cone-shaped supporting body can improve the anti-pulling bearing capacity of the whole anchor rod by utilizing the extrusion effect of the cone, improve the anchoring reliability, reduce the length of the anchor rod and the diameter of a drilled hole and save the manufacturing cost.
The invention adopts the anchor rod of the cone-cylinder supporting body, the top of the cylinder wall faces the front end of the rod body of the anchor rod, the conical surface faces the hole wall of the anchor hole forward and the included angle between the conical surface and the rod body axis of the anchor rod (equal to the included angle between the conical surface and the central hole axis of the cylinder wall) is utilized, when the rod body of the anchor rod is pulled, the cone-cylinder supporting body enables the grouting body between the conical surface and the hole wall of the anchor hole to generate direct and strong extrusion, and huge positive pressure and frictional resistance are generated between the grouting body and the hole wall of the anchor hole, so that the anti-pulling.
Drawings
FIGS. 1A-1B are schematic structural views of an embodiment of a cone carrier according to the present invention;
FIG. 2 is a schematic view of a connection mode of an embodiment of the cone-shaped supporting body of the invention when the structure is arranged on a rod body of an anchor rod;
FIG. 3 is a schematic view (including a stressed state) of an anchor rod disposed in an anchor hole according to an embodiment of the cone-cylinder carrier of the present invention;
FIG. 4 is a schematic structural view of a cone-shaped supporting body according to a second embodiment of the present invention;
FIG. 5 is a schematic view of the connection of the second embodiment of the cone-shaped supporting body of the present invention to the rod body of the anchor rod;
FIGS. 6A-6B are schematic views of three structures of an embodiment of a cone bearing body structure of the present invention;
FIG. 7 is a schematic structural diagram of a cone-shaped supporting body according to a fourth embodiment of the present invention;
FIG. 8 is a schematic view of the connection of the fourth structure of the cone-cylinder carrier of the present invention on the rod body of the anchor rod;
FIGS. 9A-9B are schematic structural views of a cone carrier according to an embodiment of the present invention;
FIG. 10 is a schematic view of the connection of the fifth structure of the cone-cylinder carrier of the present invention on the anchor rod body;
FIG. 11 is a schematic view of a fifth embodiment of the anchor rod with a cone-and-cylinder carrier structure of the present invention placed in an anchor hole;
FIG. 12 is a six-structure schematic view (with a drag reduction layer) of the cone-cylinder carrier of the present invention;
fig. 13 is a schematic view of the connection of the six structures of the embodiment of the invention on the rod body of the anchor rod.
Wherein:
1-a cone supporting body;
11-cylinder wall; 111-central hole; 1111-internal thread;
112-top; 113-a conical surface; 114-bottom; 115-a resistance reducing layer;
12-a connecting cylinder; 121-connecting hole;
2-the body of the anchor rod; 21-front end of the anchor rod body;
3, isolating a pipe; 4-welding seams;
5-grouting; 51- -outside of cone slip casting;
6-anchor hole; 61-Anchor eye Orifice.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to," "on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should also be noted that terms like "upper," "lower," "inner," "outer," "top," "bottom," "front end," "lateral," "side," "center," "axis," "outer wall," and the like in the embodiments of the present invention are merely relative concepts or references to each other in a normal use state of the product or based on the position illustrated in the drawings, and are merely used for convenience in describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered limiting.
Referring to fig. 1A-1B, fig. 2, fig. 4, fig. 6A-6B, fig. 7, fig. 9A-9B and fig. 12, the present invention first provides a cone-tube carrier 1 for an anchor rod, wherein the cone-tube carrier 1 is formed by surrounding a tube wall 11, the tube wall 11 forms a central hole 111 after surrounding, the aperture of the central hole 111 is adapted to the outer diameter of a rod body 2 of the anchor rod, the rod body 2 of the anchor rod can penetrate into the central hole 111, so that the cone-tube carrier 1 is sleeved on the rod body 2 of the anchor rod, and the cone-tube carrier 1 is used as a carrier member when the anchor rod is pulled. The cylinder wall 11 includes a top 112, a bottom 114 and an outer wall surface, wherein the outer diameter of the top 112 is smaller than that of the bottom 114, and the outer wall surface is a conical surface 113 forming an included angle a with the axis C-C of the central hole 111 (also being the center line of the cone bearing body 1, and the two are coincident). The top portion 112 and the bottom portion 114 have a hollow circular, triangular, quadrangular or polygonal cross section, and the tapered surface 113 is a tapered surface surrounding the central hole 111, and may have a shape of a conical surface, a triangular tapered surface, a quadrangular tapered surface or a polygonal tapered surface. The cylinder wall 11 is a cone, triangular pyramid, quadrangular pyramid or polygonal pyramid structure. When the cone-shaped supporting body 1 is connected with the rod body 2 of the anchor rod and then placed in the anchor hole 6, the top 112 of the cylinder wall 11 (i.e. the top of the cone-shaped supporting body 1) faces the front end 21 of the rod body of the anchor rod (the front end 21 of the rod body of the anchor rod refers to the end of the anchor rod placed in the anchor hole 6, the rod body 2 of the anchor rod is located in the anchor hole orifice 61), and the conical surface 113 faces the hole wall of the anchor hole 6. Referring to fig. 3 and 11, when the rod body 2 of the anchor rod is subjected to a forward pulling force, the cone-tube supporting body 1 moves forward, the conical surface 113 directly and radially extrudes the conical surface outer side grouting 51 (the grouting acbd surrounding the outer side of the conical surface 113 shown in fig. 3 and 11) along the normal line of the conical surface 113 to the hole wall of the anchor hole 6 in all directions of 360 degrees surrounding the rod body 2 of the anchor rod, so that a positive pressure P0 is generated between the conical surface outer side grouting 51 and the hole wall of the anchor hole 6, and the positive pressure generates frictional resistance which is converted into an anchor rod withdrawal resistance force, so that the anchor rod withdrawal resistance force is greatly improved. The force of the rod body 2 of the anchor rod is transmitted to the cone bearing body 1 through the connecting structure, the conical surface 113 serves as a bearing surface, the grouting body 51 on the outer side of the conical surface is extruded, and the force is transmitted to the rock-soil body on the wall of the anchor hole 6.
The cone-shaped cylinder carrier 1 is arranged on a rod body 2 of an anchor rod and is arranged in an anchor hole 6, cement paste injected into the anchor hole 6 is solidified on the outer side of a conical surface 113 to form wedge-shaped conical surface outer side grouting body 51 which is matched with the conical surface 113 in a wedge shape, and therefore a unique stress effect and a self-locking mechanism are achieved.
Fig. 3 shows the stress state of the cone bearing body 1 in the anchor hole 6. The cone-shaped supporting body 1 is sleeved on the rod body 2 of the anchor rod, the axes of the cone-shaped supporting body and the rod body 2 are superposed, and the included angle A between the conical surface 113 and the axis C-C of the central hole 111 is equal to the included angle between the conical surface 113 and the central axis of the rod body 2 of the anchor rod. In the figure:
t is the tension of the rod body 2 of the anchor rod to the cone-shaped supporting body 1;
p is the normal component force of the pulling force T on the conical surface 113, where P is TsinA;
q is the tangential component of the pulling force T on the tapered surface 113, Q is TcosA;
f-coefficient of friction between the cone 113 and the cone outer grout 51, typically f < 1;
f — the frictional force between the tapered surface 113 and the tapered-surface outer slip 51 due to the force P, where F is Pf.
When the included angle a between the conical surface 113 and the axis C-C of the central hole 111 is less than 45 °, Q > P > F, that is, the tangential component Q on the conical surface 113 is greater than the friction force F, and Q-F (the difference between Q and F) is gradually increased with the gradual increase of the tensile force T under the action of the tensile force T, after the initial resistance is overcome, the conical cylinder carrier 1 will generate relative displacement forward along the conical surface 113 relative to the conical surface outer side grout 51 (the grout acbd shown in fig. 3 and 11), the conical surface 113 and the conical surface outer side grout 51 (that is, the grout acbd shown in fig. 3 and 11) are in wedge-shaped fit, and the conical cylinder carrier 1 will generate a strong squeezing effect on the conical surface outer side grout 51 and will squeeze more and more tightly until self-locking.
Because the included angle between the conical surface 113 and the central axis of the cone bearing body 1 is less than 45 degrees, the conical surface 113 can generate forward relative displacement relative to the grouting body 51 (the grouting body acbd shown in fig. 3 and 11) on the outer side of the conical surface, and the grouting body 51 (the grouting body acbd shown in fig. 3 and 11) on the outer side of the conical surface between the conical surface 113 and the hole wall of the anchor hole 6 is clamped and extruded by the conical surface 113 and the hole wall of the anchor hole 6, one of the effects is that the compactness and the strength of multidirectional stress of the grouting body 51 on the outer side of the conical surface are improved, and the cone bearing body 1 is prevented from continuously displacing in turn, and the rod body 2 of the anchor rod; the second effect is that the positive pressure between the grouting body 51 outside the conical surface and the wall of the anchor hole 6 is greatly increased, the friction force of the anchor rod is greatly increased, the bearing capacity of the anchor rod is greatly improved, especially when the wall of the anchor hole 6 is made of rock or hard soil, the wrapping and extruding effects are strong, the bearing capacity of the anchor rod can be greatly improved, even self-locking is realized, namely, along with the increase of the pulling force of the anchor rod, the extruding effect is synchronously improved, the pulling-resistant bearing capacity of the anchor rod is synchronously improved, and the pulling-resistant bearing capacity of the anchor rod is always greater than the pulling force of the anchor rod.
The cone-shaped supporting body 1 is sleeved on the rod body of the anchor rod, so that the axis of the central hole 111 of the cone-shaped supporting body can be coincided with the axis of the rod body 2 of the anchor rod, the coaxiality is good, the coaxial error is small, the problem that the included angle between the conical surface 113 and the axis of the rod body 2 of the anchor rod is large due to poor control during construction is avoided, the conical surface 113 is axially symmetrical or approximately axially symmetrical around the rod body 2 of the anchor rod, the conical surface 113 can be relatively displaced relative to the grout body 51 on the outer side of the conical surface more easily or earlier, and the extrusion effect is.
As the preferable design structure of the cone supporting body 1, the included angle A between the conical surface 113 and the axis C-C of the central hole 111 is less than 16 degrees. The frictional resistance between the outside-cone grouting 51 and the wall of the anchor hole 6 is also an important factor that affects whether the cone bearing body 1 can generate relative displacement along the cone 113. The wall of the anchor hole 6 can be soil and rock, and the frictional resistance between the soil and the rock and the grouting material 51 on the outer side of the conical surface can be changed in a large range. The applicant has conducted theoretical studies and extensive simulation calculations and found that at an included angle a < 16 °, the cone 113 can be displaced relative to the cone outer slip 51 with a small force T.
Referring to fig. 1A, fig. 4, fig. 6B, fig. 7, fig. 9A and fig. 12, in the specific structural design of the cone-shaped supporting body 1 of the present invention, the wall thickness L of the top 112 of the cylinder wall is less than or equal to 3mm, so that the initial resistance of the cone-shaped supporting body 1 can be correspondingly reduced.
Referring to fig. 2, 5, 8 and 10, in the specific structural design of the cone-shaped supporting body 1 of the present invention, the difference between the diameter of the central hole 111 and the diameter of the rod body 2 of the anchor rod is less than 4 mm. When the cone supporting body 1 is sleeved on the rod body 2 of the anchor rod, a certain gap can be formed between the cone supporting body 1 and the central hole 111, and the maximum gap is not more than 4mm, so that the initial resistance when the cone supporting body 1 moves forwards is reduced.
Referring to fig. 2, 4, 7 and 9A, in order to ensure that the cone-shaped supporting body 1 is reliably connected to the rod body 2 of the anchor rod, welding, threads or a connecting tube connection mode can be adopted, and the cone-shaped supporting body 1 has a connection structure matched with the rod body 2 of the anchor rod.
Referring to fig. 1A-1B, fig. 2, and fig. 6A-6B specifically, in the specific structural design of the cone-cylinder carrier 1 of the present invention, the connecting structure is a weldable surface on the top 112 or the bottom 114 of the cylinder wall, or a weldable surface on the top 112 or the bottom 114 of the cylinder wall, the central hole 111 is a through unthreaded hole, the aperture of the unthreaded hole is slightly larger than the outer diameter of the rod body 2 of the anchor rod, the difference in the diameters of the two is smaller than 4mm, the cone-cylinder carrier 1 is sleeved on the rod body 2 of the anchor rod, and a welding seam 4 is deposited on a plane (weldable surface) at the junction position of the top 112 or/and the bottom 114 of the cylinder wall and the rod body 2 of the anchor rod by welding, so that the cone-cylinder carrier 1 can be welded and fixed. The connecting structure fixes the cone-shaped supporting body 1 on the rod body 2 of the anchor rod, and the force of the rod body 2 of the anchor rod is transmitted to the cone-shaped supporting body 1 through the connecting structure.
The connecting structure can also be a structure as shown in fig. 4, an internal thread 1111 matched with an external thread of the anchor rod body 2 is arranged on the hole wall of the central hole 111, and the cone-shaped supporting body 1 is connected with the anchor rod body 2 with the external thread in a screwing mode.
As shown in fig. 7, the cone carrier 1 may further include a connecting tube 12, the connecting tube 12 is disposed at the bottom 114 of the tube wall 11, and is formed by extending downward from the bottom 114 of the tube wall 11 and is integrally formed with the tube wall 11. The connecting cylinder 12 has a connecting hole 121 which is in butt joint with the central hole 111 on the cylinder wall 11, and the connecting structure is an internal thread which is arranged on the hole wall of the connecting hole 121 and is matched with the external thread of the rod body 1 of the anchor rod. The connecting cylinder 12 is connected with the rod body 2 of the anchor rod, so that the cone-shaped cylinder bearing body 1 is fixed on the rod body 2 of the anchor rod. Referring to fig. 8, in this structure, the central hole 111 of the cone carrier 2 is only used for the penetration of the rod body 2 of the anchor rod, and the connection of the cone carrier 1 to the rod body 2 of the anchor rod is completed by the connecting cylinder 12. Like this, the aperture of the central hole 111 of the cone supporting body 1 can be slightly greater than the external diameter of the body of rod 2 of stock, be favorable to the body of rod 2 of stock to insert, and can reduce the machining precision requirement of the central hole 111 of the cone supporting body 1, and connecting hole 121 part process as required for the body of rod 2 complex structure and length that can the stock can, the pore structure of this kind of segmentation design can strengthen the intensity of cone supporting body 1, be convenient for the processing of cone supporting body 1 and the installation on the body of rod 2 of stock. Further, the connecting cylinder 12 can be replaced according to different requirements, sizes and appearance shapes of the rod body 2 of the anchor rod, and the universality of the cone-shaped supporting body 1 can be improved.
As shown in fig. 9A to 9B, fig. 10 and fig. 11, the connecting tube 12 of the cone supporting body 1 may be provided separately from the tube wall 11 and may be provided at the bottom 114 of the tube wall 11 when mounted. The connecting cylinder 12 also has a connecting hole 121 which is in butt joint with the central hole 111 of the cylinder wall 11, and the connecting structure is an internal thread which is arranged on the hole wall of the connecting hole 121 and is matched with the external thread of the rod body 2 of the anchor rod. The structure that the connecting cylinder 12 and the cylinder wall 11 are separately arranged has more flexible design, and can be a cylinder, a nut shown in fig. 9A-9B, or other structures which facilitate the connection of the cone supporting body 1 and the rod body 2 of the anchor rod. During installation, the cone-shaped supporting body 1 is sleeved on the rod body 2 of the anchor rod, and the connecting cylinder 12 is screwed into the rod body 2 of the anchor rod and then is positioned at the bottom 114 of the cylinder wall, so that the cone-shaped supporting body 1 is fixedly connected to the rod body 1 of the anchor rod and is used for supporting the cone-shaped supporting body 1. When the connecting cylinder 12 is independently arranged, the cylinder wall 11 and the connecting cylinder 12 can be respectively processed, and different materials and different processing precisions can be selected for the cylinder wall 11 and the connecting cylinder 12 according to requirements, so that the manufacturing cost is favorably saved. It will be understood that the wall 11 and the connecting cylinder 12 can also be welded together, if appropriate.
Referring to fig. 12, in the specific structural design of the cone-shaped supporting body 1 of the present invention, the tapered surface 113 is further covered with a resistance reducing layer 115, so that the resistance of the cone-shaped supporting body 1 during displacement can be reduced. Preferentially, the thickness of the resistance reducing layer 115 is less than or equal to 1mm, so that the cone-shaped cylinder carrier 1 can obtain larger extrusion force and extrusion effect with smaller displacement.
Specifically, the resistance reducing layer 115 is a spray coating layer, an oil film layer, a plastic film layer, or a paper layer. The spraying layer can be formed by spraying paint, plastic or epoxy resin on the surface of the conical surface 113 by a nozzle, and the oil film layer, the plastic film layer or the paper layer can directly stick oil film paper, plastic film or thin paper on the surface of the conical surface 113.
Referring to fig. 3, 11 and 13, the invention further provides an anchor rod, which comprises a rod body 2 of the anchor rod and a cone-shaped supporting body 1, wherein the cone-shaped supporting body 1 is sleeved on the rod body 2 of the anchor rod and is connected with the rod body 2 of the anchor rod. After the cone supporting body 1 is connected with the body of rod 2 of stock, settle in anchor eye 6, cone supporting body 1 top 112 towards the body of rod front end 21 of stock (the one end that is located anchor eye drill way 61 position), conical surface 113 is towards the hole wall of anchor eye 6, injects grouting 5 in the anchor eye 6, grouting 5 is formed by cement mortar or cement mortar setting, fills around the body of rod 2 of cone supporting body 1 and stock, wherein the cement mortar or the cement mortar that conical surface 113 outside acbd set are conical surface outside grouting 51.
In the existing bearing body structure, the bearing surface of the bearing body is generally vertical to the central axis of the rod body 2 of the anchor rod, and because the strength of the grouting body 5 is limited, the bearing body cannot be greatly limited by the size of the anchor hole 6, the anti-pulling force which can be provided by the bearing body is limited and cannot be large; on the other hand, according to the conventional thinking mode and the existing design method, the pullout resistance of the anchor rod is limited by the bonding strength between the hole wall of the anchor hole 6 and the grout 5, the area of the hole wall of the anchor hole 6 is generally smaller, the bonding strength between the hole wall of the anchor hole 6 and the grout 5 is also smaller, and therefore the pullout resistance of the anchor rod is also smaller. One of the main factors determining the pullout resistance of the anchor rod is the frictional resistance between the wall of the anchor hole 6 and the grout 5. According to the anchor rod designed by the invention, the conical surface 113 is arranged on the conical barrel bearing body 1, the conical surface 113 is used for extruding the grouting body 51 on the outer side of the conical surface, the frictional resistance between the hole wall of the anchor hole 6 and the grouting body 51 on the outer side of the conical surface is increased, and the frictional resistance is correspondingly increased along with the continuous increase of the tensile force of the anchor rod. When the included angle of the conical surface 113 is designed reasonably, the self-locking effect can be achieved. The technical effect of the conical barrel bearing body 1 of the invention brought by extruding the side surface of the conical surface outer side grouting body 51 can improve the uplift bearing capacity of the whole anchor rod, and correspondingly improve the anchoring reliability and the service life.
With further reference to fig. 13, the rock bolt of the present invention may also be provided with a spacer tube 3 on the shank 2 of the rock bolt. Specifically, the isolation tube 3 may be provided on the rod body 2 of the anchor rod except for the portion where the cone-shaped supporting body 1 is engaged with the rod body 2 of the anchor rod. The setting of isolation tube 3 can make the body of rod 2 of the stock outside the body of rod 2 cooperation part of cone supporting body 1 and stock wrapped up, and the body of rod 2 of the stock of this part receives groundwater or other environment erosion when avoiding using for a long time, has further guaranteed anchor effect and the corrosion resisting property of whole stock after long-time use comprehensively.
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
as shown in fig. 1A-1B and fig. 2, in the first embodiment, a cone-shaped supporting body 1 is provided, the cone-shaped supporting body is formed by surrounding a cylinder wall 11, the cylinder wall 11 surrounds a central hole 111, the central hole 111 is a through unthreaded hole, the aperture is slightly larger than the outer diameter of a rod body 2 of an anchor rod, the diameter difference is smaller than 4mm, and the rod body 2 of the anchor rod penetrates through the central hole 111, so that the cone-shaped supporting body 1 is sleeved on the rod body 2 of the anchor rod.
In this embodiment, the top 112 and the bottom 114 of the cylinder wall 11 have hollow circular cross sections, the conical surface 113 is a conical surface surrounding the central hole 111, the included angle a between the conical surface and the axis C-C of the central hole 111 is 10 °, and the cone-cylinder supporting body 1 has a conical cylinder structure.
In this embodiment, the wall thickness L of the top 112 of the cylindrical wall is 2 mm. The top 112 and the bottom 114 of the cylinder wall are respectively stacked with a welding seam 4 on a plane (a weldable surface) of the junction position of the rod body 2 of the anchor rod, and the cone-cylinder carrier 1 is fixed on the rod body 2 of the anchor rod in a welding mode.
Example two:
referring to fig. 4 and 5, the cone-shaped cartridge carrier 1 provided in the second embodiment includes a cylindrical wall 11, where the cylindrical wall 11 is a cone-shaped cylindrical structure, and the external structure is consistent with the second embodiment. Different from the first embodiment, in the present embodiment, the hole wall of the central hole 111 is processed with an internal thread 1111, which is matched with the external thread on the rod body 2 of the anchor rod, and is used as a connection structure between the cone-shaped supporting body 1 and the rod body 2 of the anchor rod, so that the cone-shaped supporting body 1 is engaged and connected to the rod body 2 of the anchor rod.
The internal thread 1111 is gone up owing to the 111 pore walls of centre bore to this embodiment awl section of thick bamboo supporting body 1, does not need welding equipment during site operation, directly with awl section of thick bamboo supporting body 1 revolve the position of closing the body of rod 2 settlement of stock can, convenient operation.
Example three:
referring to fig. 6A-6B, in the cone-shaped supporting body 1 provided in the third embodiment, the cone-shaped supporting body is formed by surrounding a cylinder wall 11, a central hole 111 formed after surrounding the cylinder wall 11 is a through unthreaded hole, a rod body 2 of the anchor rod penetrates through the central hole 111, and the cone-shaped supporting body 1 is sleeved on the rod body 2 of the anchor rod. Different from the first and second embodiments, the cross sections of the top 112 and the bottom 114 of the cylinder wall are hollow hexagons, the tapered surface 113 is a hexagonal tapered surface surrounding the central hole 11, the cone-cylinder carrier 1 is in a hexagonal pyramid structure, and the included angle a between the tapered surface 113 and the axis C-C of the central hole 111 is about 15 °. Welding seams 4 are piled on the planes of the junction positions of the top 112 and the bottom 114 of the cylinder wall and the rod body 2 of the anchor rod, and the cone-cylinder carrier 1 is fixed on the rod body 2 of the anchor rod in a welding mode.
The conical cylinder supporting body 1 adopts a pyramid structure, and is convenient for positioning during field welding.
Example four:
referring to fig. 7 and 8, the structure of the cylinder wall 11 of the cone cylinder carrier 1 according to the fourth embodiment is the same as that of the first embodiment. Different from the first embodiment, the present embodiment further includes a connecting cylinder 12, the connecting cylinder 12 is formed by extending the bottom 114 of the cylinder wall downward, and is integrally formed with the cylinder wall 11, and the center thereof is provided with a connecting hole 121, which is in butt joint with the central hole 111.
The hole wall of the connection hole 121 of this embodiment is formed with an internal thread, which is a connection structure connected to the rod body 2 of the anchor rod in a fitting manner.
In this embodiment, the central hole 111 is slightly larger than the outer diameter of the rod body 2 of the anchor rod, the cylinder wall 11 is partially sleeved on the rod body 2 of the anchor rod, and when the anchor rod is installed on site, the cone-cylinder carrier 1 is engaged and connected to the rod body 2 of the anchor rod by screwing the internal thread of the hole wall of the connecting hole 121 on the connecting cylinder 12 with the external thread of the rod body 2 of the anchor rod.
In order to facilitate the screwing of the cone barrel bearing body 1, the opposite positions of the peripheral surface of the connecting barrel 12 can be processed with cut edges or grooves, so that the screwing operation tools (such as a wrench and the like) can be conveniently clamped in, and the operation is more convenient.
Example five:
referring to fig. 9A-9B, fig. 10 and fig. 11, a cone-cylinder carrier 1 provided in the fifth embodiment is substantially the same as the fourth embodiment, and is different from the fourth embodiment in that a connecting cylinder 12 and a cylinder wall 11 of the fifth embodiment are separately provided as two components, the connecting cylinder 12 is in a nut structure, is provided at a bottom end of the cylinder wall 11, and is abutted against a bottom 114, and an inner thread is processed on a hole wall of a connecting hole 121 provided in the center thereof, and is connected to a rod body 2 of an anchor rod in a matching manner.
When the anchor rod is installed on site, the cylinder wall 11 is sleeved on the rod body 2 of the anchor rod, and the connecting cylinder 12 of the nut structure is screwed at the bottom of the cylinder wall 11 and is in butt joint with the cylinder wall 11 to support and fix the cylinder wall 11.
Example six:
referring to fig. 12, a cone-shaped cylinder carrier 1 according to a sixth embodiment is substantially the same as the first embodiment, and is different from the first embodiment in that a resistance reducing layer 115 is further disposed on the tapered surface 113, and the resistance reducing layer 115 covers the tapered surface 113, and has a thickness of less than or equal to 1 mm.
The resistance reducing layer 115 may be a spray coating layer, and an epoxy resin is sprayed on the tapered surface 113 by spraying to form the spray coating layer.
Example seven:
referring to fig. 13, the present embodiment provides an anchor rod, including a rod body 2 of the anchor rod and a cone supporting body 1, where the cone supporting body 1 of the present embodiment is a fifth structure of the present embodiment, and is composed of a cylinder wall 11 and a connecting cylinder 12, and is sleeved on the rod body 2 of the anchor rod, a top 112 of the cylinder wall 11 faces a rod body front end 21 of the anchor rod, and the rod body front end 21 is located at an anchor hole opening 61. If necessary, the cone bearing body 1 and the connecting cylinder 12 can be welded into a whole.
The body of rod 2 at the stock, still be equipped with the spacer tube 3, this spacer tube 3 cover is established on the body of rod 2 of stock outside the body of rod 2 cooperation part of cone supporting body 1 and stock, makes the body of rod 2 and the slip casting 5 of stock keep apart, and the body of rod 2 of stock is pulled and is transmitted pulling force for cone supporting body 1 better.
In this embodiment, the surface of the tapered surface 113 is further covered with a resistance reducing layer 115.
The present invention is not limited to the above preferred embodiments, and 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 (9)
1. A cone supporting body for an anchor rod is characterized in that the cone supporting body is formed by surrounding a cylinder wall, a central hole formed by surrounding the cylinder wall is matched with a rod body of the anchor rod and is used for being sleeved on the rod body of the anchor rod; the cylinder wall is provided with a top, a bottom and an outer wall surface, the outer diameter of the top is smaller than that of the bottom, the outer wall surface is a conical surface, and the included angle between the conical surface and the axis of the central hole is smaller than 45 degrees.
2. A cone carrier for a rock bolt according to claim 1 wherein the angle between the conical surface and the axis of the central bore is < 16 °.
3. The cone carrier for a rock bolt of claim 1 wherein the wall thickness L at the top of the cylinder wall is less than or equal to 3 mm.
4. A cone carrier for a rock bolt according to claim 1 wherein the difference between the diameter of the central bore and the diameter of the shank of the rock bolt is < 4 mm.
5. The cone carrier for an anchor rod of claim 1, wherein the cone carrier has a connection structure to connect with a rod of the anchor rod.
6. The cone carrier for a rock bolt of claim 5 wherein said connecting structure is a weldable face on the top of the cylinder wall or/and the bottom of the cylinder wall; or the connecting structure is an internal thread which is arranged on the hole wall of the central hole and matched with an external thread of the rod body of the anchor rod; or the cone-shaped cylinder bearing body is also provided with a connecting cylinder, the connecting cylinder is arranged at the bottom of the cylinder wall and is provided with a connecting hole communicated with the central hole in a butt joint mode, and the connecting structure is an internal thread which is arranged on the hole wall of the connecting hole and matched with the external thread of the rod body of the anchor rod.
7. The cone and barrel carrier for a rock bolt of any one of claims 1-6, wherein the conical surface is further coated with a resistance reducing layer.
8. The cone carrier for a rock bolt of claim 7 wherein said drag reducing layer is an oil film layer, a spray coating layer, a plastic film layer or a paper layer.
9. An anchor rod, characterized in that, includes the body of rod of anchor rod and installs the awl barrel supporting body for anchor rod of any one of claims 1-8 on the body of rod of anchor rod, awl barrel supporting body cover is established on the body of rod of anchor rod, the top of awl barrel supporting body is towards the front end of the body of rod of anchor rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621474.3A CN111733810A (en) | 2020-07-01 | 2020-07-01 | A awl section of thick bamboo supporting body and stock for stock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010621474.3A CN111733810A (en) | 2020-07-01 | 2020-07-01 | A awl section of thick bamboo supporting body and stock for stock |
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| CN111733810A true CN111733810A (en) | 2020-10-02 |
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| CN202010621474.3A Pending CN111733810A (en) | 2020-07-01 | 2020-07-01 | A awl section of thick bamboo supporting body and stock for stock |
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