CN202520345U - High-strength constant resistance extending device for anchor cable - Google Patents

Abstract

The utility model discloses a high-strength constant resistance extending device for an anchor cable. The high-strength constant resistance extending device comprises a cylindrical sleeve, a wire-drawing die and a cold drawing rod body, wherein the wire-drawing die is a tapered die and connected with the sleeve through threads or a high-strength bolt; the cold drawing rod body is a section of reducing metal rod of which one end is a thick section and the other end is a thin section; a tapered section is formed between the thick section and the thin section; and the taper of the tapered section is matched with that of the wire-drawing die; the thick end of the cold drawing rod body is embedded into the sleeve, and the end of the thin section is introduced from a hole of the wire-drawing die; external threads for mounting a supporting tray and locking a nut are arranged at the tail of the sleeve; external threads for connecting an anchor cable are arranged at the end of the thin section of the cold drawing rod body, or external threads for connecting the anchor cable body are arranged at the end of the thin section of the cold drawing rod body; and an end plug for connecting another anchor cable body is arranged at the tail of the sleeve. The high-strength constant resistance extending device achieves deformation under constant resistance, and the strength of the rod is greatly improved through drawing after the rod passes through a die hole.

Description

A kind of high-strength constant-resistance elongation device of anchor cable

Technical field

The anchor cable of using when the utility model relates to the supporting of engineering field such as a kind of mine, tunnel, water conservancy and hydropower relates in particular to the elongation device of anchor cable.

Background technology

In the mine, during the supporting of engineering field such as tunnel, water conservancy and hydropower, anchor cable is to use a lot of supporting equipments.Along with mining depth constantly increases and the construction of underground construction on a large scale, the geological conditions that faces becomes increasingly complex, and country rock often shows the large deformation characteristics.When rock deformation is bigger, surpass anchor cable can bear scope the time, will cause the anchor cable damage inactivation, and then cause underground construction unstable failure accident.Require employed anchor cable when country rock generation large deformation, can receive to stretch long in this case and itself does not destroy, be out of shape with suitable for surrounding rock.

At present, the deformable elongation device of domestic employing mainly adopt dish or Pear-Shaped pallet, the deformable body of rod or liner, improvement steel strand ground tackle, push the large deformation that device such as steel bushing slidably comes the suitable for surrounding rock body.Said apparatus allows deflection generally less, can not adapt to the characteristics of large deformation, and allow the bigger device of deflection, and the effective resistance that can provide is not enough, and performance is stable inadequately, can not satisfy modern underground engineering support demand.

The utility model content

The task of the utility model is to provide a kind of high-strength constant-resistance elongation device.This device is applied in the anchor cable, when country rock generation large deformation, can under high loading condition, receives to stretch long and itself does not destroy, guarantee the safety of large deformation geotechnical engineering.

For achieving the above object, the scheme that the utility model is taked is:

Technical scheme one: a kind of high-strength constant-resistance elongation device is characterized in that it comprises tubular sleeve pipe, wire-drawing die and the cold-drawn body of rod; Described wire-drawing die is a conical die, and wire-drawing die links to each other through screw thread or high-strength bolt with sleeve pipe; The cold-drawn body of rod is one section diameter metal bar, and an end is a thin segment for thick section, the other end, is conical section between thick section and the thin segment, and the tapering of conical section and wire-drawing die tapering are complementary, and cold-drawn body of rod butt end is nested in the sleeve pipe, and draw from the wire-drawing die aperture thin segment end; The afterbody of sleeve pipe is provided with the external screw thread that is used for tray and locking nut, and cold-drawn body of rod thin segment end is provided with the external screw thread that is used to connect anchor cable.

Technical scheme two: a kind of high-strength constant-resistance elongation device is characterized in that it comprises tubular sleeve pipe, wire-drawing die and the cold-drawn body of rod; Described wire-drawing die is a conical die, and wire-drawing die links to each other through screw thread or high-strength bolt with sleeve pipe; The cold-drawn body of rod is one section diameter metal bar, and an end is a thin segment for thick section, the other end, is conical section between thick section and the thin segment, and the tapering of conical section and wire-drawing die tapering are complementary, and cold-drawn body of rod butt end is nested in the sleeve pipe, and draw from the wire-drawing die aperture thin segment end; Cold-drawn body of rod thin segment end is provided with the external screw thread that is used to connect the anchor cable body; It is stifled to be provided with the end that is used to connect another anchor cable body at the afterbody of sleeve pipe, and end is stifled to link to each other with sleeve pipe through internal thread.

Above-mentioned two technical scheme middle sleeve diameters and wall thickness should meet the anchored force requirement, and its length is corresponding to cold-drawn body of rod butt end length;

The cold-drawn body of rod all has following three kinds of form of structure in above-mentioned two technical schemes:

1, solid reducing round steel structure;

2, reducing hollow steel pipe structure, the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit;

3, the thick section of the body of rod adopts hollow-core construction, and thin segment adopts solid construction, and the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit; Screw thread, casting or welding connection structure are adopted in being connected of conical section and thin end

Above-mentioned wire-drawing die material can be selected carbide alloy or high-quality steel for use.

In order to prevent cold-drawn body of rod damaged or broken that can on the cold-drawn body of rod and wire-drawing die, be coated with sliding agent, the material of sliding agent can be selected soap, vegetable oil for use.

When the cold-drawn body of rod adopts hollow steel pipe to process,, can in pipe, the round steel core be set in order to prevent in the body of rod drawing process that inner surface produces the damage influence lever strength.

The utility model technical scheme one is used for common anchor cable and simple root kedge rope, during use, through the disk that is processed with the anchor cable perforation anchor cable body is connected cold-drawn body of rod thin segment end.

The utility model technical scheme two is used for during use, through the disk that is processed with the anchor cable perforation anchor cable body being connected cold-drawn body of rod thin segment end to wearing formula transverse arrest elongation anchor cable; Through holding to block up another anchor cable body is connected the sleeve pipe afterbody with disk.

The utility model can produce continuous deformation in the process of cold-drawn, and keep constant pulling capacity according to the cold-drawn performance that is metal.When adopting bar drawing,, can obtain body of rod working stress design formulas and be according to the plastic deformation theory of mechanics:

${\mathrm{\&sigma;}}_L={\mathrm{\&sigma;}}_s(1+\frac{\tan \mathrm{\&alpha;}}{f})[1-{(1-\frac{D_1}{D_0})}^{\frac{2f}{\tan \mathrm{\&alpha;}}}]+\frac{4\sqrt{3}}{9}{\mathrm{\&sigma;}}_s\tan \mathrm{\&alpha;}+0.15f\frac{{\mathrm{<figure-callout\; id="1"\; label="L\; d\; D"\; filenames="HSA00000713941800011.png"\; state="\{\{state\}\}">L</figure-callout>}}_d}{D_{}}{\mathrm{\&sigma;}}_s---\left(1\right)$

Wherein, σ _LBe drawing stress, i.e. working stress, the just axial stress of the wire-drawing die exit body of rod; σ _sBe the average deformation drag before and after the body of rod drawing; α is a modular angle; F is a friction factor; D ₀Be green diameter; D ₁For extracting the back diameter; L _dBe sizing area length.

Body of rod pulling force is that the resistance that the constant-resistance elongation device provides is:

$F={\mathrm{\&sigma;}}_L\&times;\frac{\mathrm{\&pi;}}{4}{\mathrm{<figure-callout\; id="1"\; label="D"\; filenames="HSA00000713941800011.png"\; state="\{\{state\}\}">D</figure-callout>}}_1^2---\left(2\right)$

The factors such as front and back diameter, section shrinkage rate, material property, modular angle, sliding agent kind of pulling out according to the body of rod are different, and pulling capacity is little then several tons, and maximum can reach kiloton.

The operating principle of the high-strength constant-resistance elongation device of the utility model roughly is:

When country rock deforms, can produce pulling force to anchor cable, this pulling force is delivered to the cold-drawn body of rod via steel strand, because the thicker end diameter of the cold-drawn body of rod is greater than wire-drawing die aperture internal diameter, wire-drawing die stops its outside motion, can produce very big extruding force between the two.When pulling force surpassed the moulding deformation force of the cold-drawn body of rod, necking took place in the cold-drawn body of rod under the effect of longitudinal pulling force and wire-drawing die lateral pressure, and its cross section diminishes, and the body of rod is slowly extracted.This distortion can continue to carry out, and keeps constant pulling capacity, has so just realized the purpose of the continuous large deformation of constant-resistance.

The utility model constant-resistance elongation device makes full use of the cold-drawn performance of reinforcing bar/steel pipe; Suffered pulling force can produce continuous deformation during greater than its specified pulling capacity; Allow the cold-drawn body of rod that big displacement takes place and be out of shape, and keep constant resistance, in this process, can also constantly absorb the surrouding rock deformation energy with suitable for surrounding rock; Also improve the anti-seismic performance of anchor cable in addition, guaranteed the safety of large deformation geotechnical engineering.Except realizing the constant-resistance distortion, another beneficial effect of drawing is that intensity significantly improved after the body of rod passed through nib.In addition, the utility model also has can provide resistance big, simple in structure, characteristics such as stable performance.

Description of drawings

Below in conjunction with accompanying drawing and concrete application example the utility model is described further:

Fig. 1 is high-strength constant-resistance elongation device generalized section, is example with reducing hollow steel pipe structure among the figure;

Fig. 2 is the drawing deformation structure principle chart, is example with the solid construction among the figure;

Fig. 3 is applied to the sketch map of common anchor cable for the utility model;

Fig. 4 is applied to wearing the embodiment sketch map of anchor cable for the utility model;

Fig. 5 is applied to the sketch map of single kedge rope for the utility model.

Marginal data, 1-sleeve pipe, 2-wire-drawing die, the 3-cold-drawn body of rod, 4-first external screw thread; 5-second external screw thread, 6-internal thread, 7-high-strength bolt, 8-disk, 9-anchor cable body; The 10-outer end cap, 11-locking nut, 12-anchor dish, 13-concrete pier; The 14-Grouting Pipe, 15-end bridging structure, the nut of 16-band shrinkage hole, 17-lock dog.

The specific embodiment

Further specify the structure of first kind of technical scheme of the utility model constant-resistance elongation device in conjunction with Fig. 1.

A kind of high-strength constant-resistance elongation device, it comprises tubular sleeve pipe 1, wire-drawing die 2 and the cold-drawn body of rod 3; Described wire-drawing die 2 is conical die; Wire-drawing die 2 links to each other through screw thread or high-strength bolt 7 with sleeve pipe 1, and the cold-drawn body of rod 2 is one section diameter metal bar, and an end is a thin segment for thick section, an end; Between thick section and the thin segment is conical section, and the tapering of the tapering of conical section and wire-drawing die 2 is complementary; The cold-drawn body of rod 3 thick sections are nested in the sleeve pipe 1, and draw from wire-drawing die 2 apertures the cold-drawn body of rod 3 thin segment ends; The afterbody of sleeve pipe 1 is provided with first external screw thread 4 that is used to install locking nut, and the thin segment end of the cold-drawn body of rod is provided with second external screw thread 5 that is used to connect anchor cable.

Above-mentioned sleeve pipe 1 diameter and wall thickness should meet the anchored force requirement, and its length is corresponding to the cold-drawn body of rod 3 butt end length;

Above-mentioned wire-drawing die 2 materials can be selected carbide alloy or high-quality steel for use.The very large intensity that has wire-drawing die 2 can stand very big axially to draw, pressure, and the deflection that takes place in the process is very little;

The above-mentioned cold-drawn body of rod 3 has following form of structure, and Fig. 1 only illustrates reducing hollow steel pipe structure:

1, solid reducing round steel structure;

2, reducing hollow steel pipe structure, the terminal of the thick section of steel pipe is provided with lock dog 17 as the body of rod drawing limit, and is as shown in Figure 1;

3, the thick section of the body of rod adopts hollow-core construction, and thin segment adopts solid construction, and the terminal of the thick section of steel pipe is provided with lock dog 17, as the body of rod drawing limit; Screw thread, casting or welding connection structure are adopted in being connected of conical section and thin end.

When the cold-drawn body of rod adopts hollow steel pipe to process,, can in pipe, the round steel core be set in order to prevent in the cold-drawn body of rod 3 drawing processes that inner surface produces the damage influence lever strength.

In order to prevent cold-drawn body of rod damaged or broken that on the cold-drawn body of rod 3 and wire-drawing die 2, be coated with sliding agent, the material of sliding agent can select for use soap, vegetable oil all can.

This device also can be applicable between two anchor cables, for this reason, is provided with the internal thread 6 that is used to connect anchor cable at the afterbody of sleeve pipe 1.

The utility model is according to the cold-drawn principle of metal; The cold-drawn body of rod 3 as shown in Figure 2 keeps in touch with wire-drawing die 2; When the cold-drawn body of rod 3 received tensile force f, 3 effects of 2 pairs of cold-drawn bodies of rod of wire-drawing die had frictional force T and normal pressure N, because the rigidity of the ratio of rigidity wire-drawing die of the cold-drawn body of rod 3 is little; Its cross section is compressed, and is drawn out wire-drawing die 2 gradually.Can produce continuous deformation in the process of cold-drawn, and keep constant pulling capacity.

Second kind of technical scheme of the utility model is identical with first kind of cardinal principle; Different is: the afterbody at first kind of technical scheme middle sleeve is provided with the external screw thread that is used for tray and locking nut; And it is stifled in second kind of technical scheme, to be provided with the end that is used to connect another anchor cable at the afterbody of sleeve pipe, and end is stifled to link to each other with sleeve pipe through internal thread.(see figure 4)

The utility model is applied in the anchor cable, the multiple specific embodiment can be arranged, just list here that to lift three specific embodiments following to adapt to different working conditions:

As shown in Figure 3, when the utility model is applied to common anchor cable, anchor cable body 9 is connected on the cold-drawn body of rod 3 through the disk 8 that is processed with the anchor cable perforation, disk 8 is connected with the cold-drawn body of rod 3 through second external screw thread 5.With anchor cable body 9 boring of packing into, through Grouting Pipe 14 grouting, and build concrete pier 13, through internal thread 6 outer end cap 10 is fixed on the sleeve pipe 1.After treating that the anchoring agent is solidified, through first external screw thread, 4 usefulness locking nuts 11 sleeve pipe 1 and anchor dish 12 are locked on the concrete pier 13, and apply the prestressing force of design.

As shown in Figure 4 is a kind of to wearing formula transverse arrest elongation anchor cable; It is constant-resistance elongation device two ends to be connected anchor cable body 9 be applied in adjacent two tunnels or the tunnel; One end is sleeved on anchor cable body 9 on the cold-drawn body of rod 3 through disk 8; The other end connects the stifled assembling structure 15 in upper end through internal thread 6, another anchor cable body 9 is connected above that again; Rock pillar between adjacent two tunnels or the tunnel exists under the tangible heavily stressed situation, needs this to wearing the formula prestress anchorage cable; Between two tunnels, get through the hole, outer anchor head is all installed at two ends, has saved interior anchoring section.

As shown in Figure 5, for coal-mine soft-rock roadway support, roadway surrounding rock often shows the large deformation characteristic; Hole in the general small-bore of adopting; Anchor cable body 9 adopts single steel strand, and the anchoring of bottom, hole is broken the constant-resistance elongation device that is necessary to adopt the utility model in order to prevent steel strand.When using the utility model, anchor cable body 9 is sleeved on the cold-drawn body of rod 3 through the nut 16 of being with shrinkage hole, fixing through second external screw thread, 5 usefulness locking nuts 11 again, be locked on the hole wall through first external screw thread, 4 usefulness locking nuts again after the well cementing anchoring of packing into.

Claims (8)

1. the high-strength constant-resistance elongation device of an anchor cable is characterized in that, it comprises tubular sleeve pipe, wire-drawing die and the cold-drawn body of rod; Described wire-drawing die is a conical die, and wire-drawing die links to each other through screw thread or high-strength bolt with sleeve pipe; The cold-drawn body of rod is one section diameter metal bar, and an end is a thin segment for thick section, the other end, is conical section between thick section and the thin segment, and the tapering of conical section and wire-drawing die tapering are complementary, and cold-drawn body of rod butt end is nested in the sleeve pipe, and draw from the wire-drawing die aperture thin segment end; The afterbody of sleeve pipe is provided with the external screw thread that is used for tray and locking nut, and cold-drawn body of rod thin segment end is provided with the external screw thread that is used to connect anchor cable; Require casing diameter and wall thickness should meet the anchored force requirement, its length is corresponding to cold-drawn body of rod butt end length.

2. high-strength constant-resistance elongation device as claimed in claim 1 is characterized in that, on the cold-drawn body of rod and wire-drawing die, is coated with sliding agent.

3. high-strength constant-resistance elongation device as claimed in claim 1 is characterized in that, the described cold-drawn body of rod has following three kinds of form of structure:

The one, solid reducing round steel structure;

The 2nd, reducing hollow steel pipe structure, the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit;

The 3rd, the thick section of the body of rod adopts hollow-core construction, and thin segment adopts solid construction, and the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit.

4. high-strength constant-resistance elongation device as claimed in claim 3 is characterized in that, in the reducing hollow steel pipe, is provided with the round steel core.

5. the high-strength constant-resistance elongation device of an anchor cable is characterized in that, it comprises tubular sleeve pipe, wire-drawing die and the cold-drawn body of rod; Described wire-drawing die is a conical die, and wire-drawing die links to each other through screw thread or high-strength bolt with sleeve pipe; The cold-drawn body of rod is one section diameter metal bar, and an end is a thin segment for thick section, the other end, is conical section between thick section and the thin segment, and the tapering of conical section and wire-drawing die tapering are complementary, and cold-drawn body of rod butt end is nested in the sleeve pipe, and draw from the wire-drawing die aperture thin segment end; Cold-drawn body of rod thin segment end is provided with the external screw thread that is used to connect the anchor cable body; It is stifled to be provided with the end that is used to connect another anchor cable body at the afterbody of sleeve pipe, and end is stifled to link to each other with sleeve pipe through internal thread; Require casing diameter and wall thickness should meet the anchored force requirement, its length is corresponding to cold-drawn body of rod butt end length.

6. high-strength constant-resistance elongation device as claimed in claim 5 is characterized in that, on the cold-drawn body of rod and wire-drawing die, is coated with sliding agent.

7. high-strength constant-resistance elongation device as claimed in claim 5 is characterized in that, the described cold-drawn body of rod has following three kinds of form of structure:

The one, solid reducing round steel structure;

The 2nd, reducing hollow steel pipe structure, the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit;

The 3rd, the thick section of the body of rod adopts hollow-core construction, and thin segment adopts solid construction, and the terminal of the thick section of steel pipe is provided with lock dog, as the body of rod drawing limit.

8. high-strength constant-resistance elongation device as claimed in claim 7 is characterized in that, in the reducing hollow steel pipe, is provided with the round steel core.

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