CN210031791U - Anchor cable hole bottom reverse pulling device - Google Patents

Abstract

The utility model relates to a reverse pulling device at the bottom of an anchor cable hole. The device includes a base, a barb mechanism and a traction mechanism. The base is restricted in the anchor cable hole by the barb mechanism. One end of the traction rope of the traction mechanism extends out of the anchor cable hole to connect with the anchor cable, and the other end is connected with external power. . The invention better solves the problems in the current anchor cable construction process, such as the difficulty of installing the anchor cable in the traditional orifice push installation method, the twisting of the anchor cable body in the borehole, the serious loss of prestress, the low construction efficiency of the anchor cable, and the reinforcement of the anchor cable. The quality is difficult to meet the engineering requirements and a series of problems. Using the fixed pulley at the bottom of the hole, the installation of the anchor cable is changed from the "push" at the tail to the "pull" at the head by the reverse pulling method, so as to avoid bending, twisting and installation difficulties, and improve the construction efficiency of the anchor cable; After the cable installation is completed, the anchor cable body is in a straight state in the borehole, which effectively reduces the prestress loss during the tensioning process of the anchor cable and ensures the anchoring quality of the anchor cable.

Description

Anchor cable hole bottom reverse pulling device

technical field

The invention relates to the technical field of civil engineering, in particular to an anchor cable hole bottom reverse pulling device.

Background technique

Since the introduction of anchor cable technology into my country in the 1960s, the technology has been widely used in many civil engineering fields, especially in water conservancy and hydropower. At present, the anchor cable has become an important technology for the support and reinforcement of dam foundations, slopes and underground caverns in water conservancy and hydropower projects. The anchor cable is generally made of high-strength steel strands tied side by side. It is manually pushed into the pre-finished geotechnical hole, and then the root is grouted and fixed, and then the exposed end of the slope is tensioned with a jack. to exert reverse pressure on the reinforced rock mass.

The construction of the anchor cable is generally carried out according to the following construction procedures: measurement and positioning → hole making → anchor cable production → anchor cable installation → anchor cable grouting → anchor cable grading tension → anchor cable locking. The installation of the anchor cable refers to manually pushing the anchor cable body into the pre-finished borehole at the orifice after the anchor cable is fabricated.

However, in view of the fact that the anchor cable construction is mostly under complex conditions such as steep slopes and narrow caverns, in the actual construction process, there are the following problems when the anchor cable adopts the traditional orifice push installation method:

1. The cable body of the anchor cable is flexible and difficult to push:

The anchor cable is composed of steel strands and other components. It is a tensile member in engineering. Its mechanical properties are linear flexible bodies. Due to the long length of the anchor cable (the length of which is generally 30m to 50m), its flexibility is more and more obvious. When using the traditional push installation from the orifice to the hole, the thrust point can and can only be the part of the cable body outside the orifice. This method is equivalent to threading a soft noodle through a straw. Since the anchor cable is a linear flexible body, and there is friction between the cable body and the wall of the borehole, the axial thrust of the orifice can easily buckling the cable body into an "S-shaped" during the inward transmission along the flexible cable body. , which increases the frictional resistance of the cable body along the way, making it difficult to push.

Especially when installing the inclined anchor cable, it is necessary to overcome not only the effect of the friction force of the hole wall, but also the effect of the weight force of the anchor cable, which is more difficult when using the traditional orifice push installation method.

2. The anchor cable body is easy to twist, and the prestress loss is serious

When the traditional orifice push installation method is adopted, the anchor cable body twists in the axial direction during the push process, which makes the anchor cable appear "twisted", which may cause the distortion and blockage of the exhaust pipe and the grouting pipe, which will affect the later injection. slurry effect, or need to be pulled out to repair and install, or even lead to the scrapping of the anchor cable.

The axial torsion of the anchor cable body will not only cause the twisting of the exhaust pipe and the grouting pipe, but also have a great adverse effect on the tension of the anchor cable in the later stage. Due to the twisted state of the anchor cable body, the frictional force of the anchor cable strand increases during the tensioning process, resulting in the loss of the anchoring force along the way, resulting in the loss of the prestress of the anchor cable, and finally affecting the anchoring effect of the anchor cable.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides an anchor cable hole bottom reverse pulling device. The present invention changes the existing hole pushing flexible cable body into the hole bottom pulling flexible cable body to ensure the smooth installation of the anchor cable, and Avoid stress loss when the installed anchor cable is tensioned. .

The technical scheme adopted in the present invention is: a reverse pulling device at the bottom of an anchor cable hole, which is characterized in that it includes a base set at the bottom of the anchor cable hole, a barb mechanism set on the base, and a hook mechanism set in the base A traction mechanism is provided, the base is limited in the anchor cable hole by the barb mechanism, and one end of the traction rope of the traction mechanism extends out of the anchor cable hole to be connected with the anchor cable, and the other end is connected with the external power.

Preferably, the base is cylindrical, and the base is provided with at least one barb mechanism along the circumferential direction.

Further, the base includes two half bases of the same structure, and the two half bases are fixedly connected by bolts.

Furthermore, each of the half bases is provided with a barb mechanism.

Preferably, the barb device includes a steel pin and a spring, one end of the steel pin is hinged on the base, the other end extends out of the base, and is inclined to the side of the anchor cable hole; one end of the spring is connected to the base, The other end is connected with a steel pin.

Further, the traction mechanism includes a pulley provided in the base, one end of the traction rope extends out of the anchor cable hole to be connected to the anchor cable, and the other end bypasses the pulley and is connected to the external power.

The method for installing the anchor cable using the above-mentioned reverse pulling device at the bottom of the anchor cable hole includes the following steps:

(1) Drilling the anchor cable hole: confirm the position, direction, diameter and hole depth of the anchor cable hole according to the requirements of the construction drawings, and carry out the drilling construction of the anchor cable hole;

(2), making anchor cables;

(3) Assemble the reverse pulling device at the bottom of the anchor cable hole: first pass the wire rope through the fixed pulley, and then install the fixed pulley, spring and steel pin in the reserved groove of the base;

(4), install the reverse pulling device at the bottom of the anchor cable hole: push the reverse pulling device at the bottom of the anchor cable hole assembled in step (3) to the bottom of the anchor cable hole, the effect of the steel pin on the reverse pressure of the hole wall When the device is pushed to the reaming section at the bottom of the anchor cable hole, the steel pin is opened under the action of the spring, so that the end of the steel pin is stuck on the rock platform of the reaming section at the bottom of the anchor cable hole, and then the whole device is locked. at the bottom of the anchor hole;

(5) Install the anchor cable: tie one end of the wire rope to the inner end of the anchor cable, and place the other end of the wire rope at the orifice to connect with the external power. Under the action of the external power and the fixed pulley, the anchor cable body is pulled to the Design the depth of the hole and complete the installation of the anchor cable;

(6) Grouting and prestressed tensioning: After the installation of the anchor cable is completed, grouting is carried out, and after the grout is solidified, the anchor cable is tensioned step by step.

Preferably, in the step (1), when the anchor cable hole is drilled, the hole is drilled to the designed hole depth according to the designed diameter, and the hole is continued to be drilled forward by 20 cm, and the end of the hole is reamed by 10 cm.

The beneficial effects obtained by the invention are as follows: in the current anchor cable construction process, the traditional method of pushing and installing the anchor cable has the difficulty of installing the anchor cable, the twisting and twisting of the anchor cable body in the borehole, the serious loss of prestress and the anchorage. There are a series of problems such as low cable construction efficiency and difficulty in reinforcing quality to meet engineering requirements. Compared with the traditional installation method, the present invention has the following outstanding advantages:

(1) Using the fixed pulley at the bottom of the hole, the installation of the anchor cable is changed from the "push" at the tail to the "pull" at the head by the reverse pulling method, so as to avoid bending, torsion and installation difficulties, and improve the construction efficiency of the anchor cable. .

The mechanical properties of the anchor cable are linear flexible bodies. When the traditional orifice push installation method is used, the force transmission effect of the thrust along the axial direction of the anchor cable is significantly reduced. The advantage of the present invention lies in that the pulling force is applied to the wire rope at the hole, which is converted into the reverse pulling force on the anchor cable body through the action of the fixed pulley at the bottom of the hole, and finally the anchor cable body is pulled to the designed hole depth. The entire length of the cable body is in tension, which makes good use of the good effect of the linear flexible body along the axial tension force transmission. Therefore, the present invention greatly reduces the installation difficulty of the anchor cable, improves the one-time installation success rate and construction efficiency of the anchor cable, saves the construction period, and is of great significance to the slope reinforcement and emergency rescue project.

(2) Ensure that after the installation of the anchor cable is completed, the anchor cable body is in a straight state in the borehole, which effectively reduces the prestress loss during the tensioning process of the anchor cable and ensures the anchoring quality of the anchor cable.

When the traditional anchor cable hole push installation method is adopted, the anchor cable body will be buckled and twisted in the axial direction during the pushing process, which will increase the friction force between the anchor cable and the hole wall during the later tension process, resulting in the loss of anchor cable prestress. Since the present invention adopts the installation method of reverse pulling at the bottom of the hole, the entire length of the anchor cable body is in a tension state, and the cable body is in a straight state under the action of tension. Since the anchor cable body is in a straight state, in the later tensioning process, the loss of anchoring force along the way is greatly reduced, ensuring that the prestress of the anchor cable reaches the design rated value. Therefore, the present invention reduces the prestress loss of the anchor cable, and ensures the reinforcement effect of the anchor cable and the construction quality of the project.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of half base;

Figure 3 is a schematic diagram of the installation of the anchor cable;

Reference numerals: 100, reverse pulling device at the bottom of the anchor cable hole, 1, base, 11, fixed pulley preloading groove, 12, fixed pulley rotating shaft preloading groove, 13, steel pin preloading groove, 14, spring preloading Groove, 15, Bolt hole, 2, Fixed pulley, 21, Fixed pulley shaft, 22, Traction rope, 3, Steel pin, 4, Spring, 200, Anchor cable hole, 201, Anchor cable hole reaming section, 300, Anchor cable.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-3, a reverse pulling device at the bottom of an anchor cable hole of the present invention includes a base 1, a barb mechanism and a traction mechanism arranged at the bottom of the anchor cable hole 200, and the barb mechanism is arranged on the base 1, it is used to limit the base 1 to the bottom of the anchor cable hole 200, and at the same time to ensure that the base 1 can be smoothly pushed from the hole of the anchor cable hole 200 to the bottom of the hole; the traction mechanism is installed in the base 1, and the traction mechanism of the traction mechanism One end of the rope 22 extends out of the anchor cable hole 200 and is connected with the anchor cable 300, and the other end is connected with an external power. Pull deep into the design hole.

The base 1 is cylindrical, and the base 1 is provided with at least one barb mechanism along the circumferential direction. In this embodiment, two barb mechanisms are symmetrically provided on the base 1 along the circumferential direction.

In this embodiment, the barb device includes a steel pin 3 and a spring 4. One end of the steel pin 3 is hinged on the base 1, and the other end extends out of the base 1 and is inclined to the side of the anchor cable hole 200; one end of the spring 4 is connected to the base 1. The seat 1 is connected, and the other end is connected with the steel pin 3. During the process of pushing the anchor cable hole bottom reverse pulling device 100 from the anchor cable hole 200 orifice to the hole bottom, the steel pin 3 is pushed by the anchor cable hole 200 hole wall, and is retracted to the base 1 side, and the spring 4 is compressed; After the reverse pulling device 100 at the bottom of the anchor cable hole is pushed to the bottom of the hole, the steel pin 3 opens at the reaming section 201 of the anchor cable hole. The bottom reverse puller 100 is firmly constrained to the bottom of the anchor hole 200 hole.

In this embodiment, the traction mechanism includes a pulley 2 (which can be in the form of a pulley block. In this embodiment, since the entire device is disposable and cannot be recycled, only one fixed pulley is used to change the direction of force), and the traction One end of the rope 22 (using a steel wire rope) extends out of the anchor cable hole 200 and is connected to the anchor cable 300, and the other end bypasses the fixed pulley 2 and is connected to an external power source.

The base 1 is the foundation of the whole device, and there are fixed pulley preloading groove 11, fixed pulley rotating shaft preloading groove 12, steel pin preloading groove 13 and spring preloading groove 14, fixed pulley 2, fixed pulley rotating shaft 21, The steel pin 3 and the spring 4 are respectively installed in the corresponding pre-installed grooves. In this embodiment, the base 1 is made of cast iron and consists of two symmetrical pieces. The single piece is semi-cylindrical in shape, 130mm high and 150mm in diameter (slightly smaller than the drilled hole). A fixed pulley reserved groove 11 with a size of 40mm wide x 110mm high x 45mm deep is set in the middle of the base 1, and a fixed pulley shaft pre-installation groove 12 with a diameter of 8mm x 10mm deep is set on both sides to facilitate the installation of the fixed pulley shaft 21; A steel pin reserved slot 13 with a maximum width of 20mm × maximum height 50mm × depth 10mm, and a reserved hole with a diameter of 8mm × a depth of 5mm at the bottom of the slot to facilitate the installation of the steel pin shaft; the inner side of the steel pin reserved slot 13 is provided with a diameter of 14mm × depth of 33mm The spring reserved groove 14; the base 1 is provided with bolt holes 15 with a diameter of 6.5mm. The bolts 15 can combine the bases of the two half blocks into a complete cylindrical base 1 through the bolt holes 15, and constrain the fixed pulley 2, the steel pin 3 and the spring 4 installed in the reserved groove.

In this embodiment, the material of the spring 4 is alloy spring steel, with an outer diameter of 14 mm and a length of 40 mm.

In this embodiment, the steel pin 3 is made of carbon steel, the size is 45mm long x 10mm wide x 20mm high, one end is semi-circular with a diameter of 10mm, and two sides are provided with shafts of diameter 7.5mm x height 5mm.

In this embodiment, the fixed pulley 2 is made of carbon steel, the size is 84mm in diameter x 30mm in width, a wheel groove with a width of 20mm x 5mm in depth is set in the middle, and a rotating shaft with a diameter of 7.8mm x 10mm in height is set in the center of both sides of the fixed pulley.

In this embodiment, the steel wire rope is made of ordinary steel wire, with a diameter of not less than 4 mm, and its length is determined according to the depth of the anchor cable hole, which is generally (2 times the depth of the anchor cable hole + the operating length outside the hole).

In this embodiment, the material of the bolt is carbon steel, and the diameter is 6.5 mm.

The dimensions of the components listed above are the dimensions used in a certain project, and the actual dimensions can be adjusted according to specific project requirements.

When assembling, first pass the wire rope 22 through the fixed pulley 2, secondly place the fixed pulley 2, the spring 4 and the steel pin 3 in the reserved groove corresponding to the base 1, then splicing the other base, and finally on the base. 1. Install the bolts in the four bolt holes 15 around the 1 for tightening.

The method for installing the anchor cable using the above-mentioned reverse pulling device at the bottom of the anchor cable hole includes the following steps:

(1), drilling the anchor cable hole: before the construction of the anchor cable, confirm the position, direction, aperture and hole depth of the anchor cable drilling according to the requirements of the construction drawings. For example) drill to the designed hole depth, and continue to drill 20cm forward, and at the end 10cm, use a reaming drill to expand the hole diameter to 180mm;

(2) Making anchor cables: bundle the grouting pipes, steel strands and isolation brackets into a bundle, and put them into the corrugated pipe after bundling;

(3) Assemble the reverse pulling device at the bottom of the anchor cable hole: first pass the wire rope through the fixed pulley, then place the fixed pulley, spring and steel pin in the reserved groove of the base, and then splicing the other base together , and finally install the bolts in the four bolt holes around the base for fastening, and complete the assembly of the reverse pulling device at the bottom of the anchor cable hole;

(4) Install the reverse pulling device at the bottom of the anchor cable hole: use the drill pipe to push the reverse pulling device at the bottom of the anchor cable hole assembled in step (3) to the bottom of the anchor cable hole, and the steel pin is reversed on the hole wall Under the action of pressure, it shrinks (the opening width is the same as the design diameter of the drilled hole). When the device is pushed to the reaming section at the bottom of the anchor cable hole, the steel pin expands under the action of the spring, so that the end of the steel pin is stuck in the anchor cable hole. On the rock platform of the bottom reaming section, the whole device is then clamped at the bottom of the anchor cable hole to complete the installation of the reverse pulling device at the bottom of the anchor cable hole;

(5) Install the anchor cable: tie one end of the wire rope to the inner end of the anchor cable, and place the other end of the wire rope in the orifice to connect with the external power (human or mechanical), under the action of the external power and the fixed pulley, the anchor cable is The cable body is pulled to the designed hole depth to complete the installation of the anchor cable;

(6) Grouting and prestressed tensioning: After the installation of the anchor cable is completed, grouting is carried out, and after the grout is solidified, the anchor cable is tensioned step by step.

The basic principles and main structural features of the present invention have been shown and described above. The present invention is not limited by the above examples, and without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. The utility model provides an anchor rope hole bottom reverse tractive device which characterized in that: including setting up base (1) in anchor rope hole (200) bottom, setting barb mechanism on base (1) and the drive mechanism of setting in the base, base (1) are restricted in anchor rope hole (200) through barb mechanism, drive mechanism's haulage rope (22) one end is stretched out anchor rope hole (200) and is connected with anchor rope (300) outward, and the other end is connected with outside power.

2. The cable bolt hole bottom reverse pulling device as claimed in claim 1, wherein: the base (1) is cylindrical, and the base (1) is provided with at least one barb mechanism along the circumferential direction.

3. The cable bolt hole bottom reverse pulling device as claimed in claim 2, wherein: the base (1) comprises two half bases with the same structure, and the two half bases are fixedly connected through bolts.

4. The cable bolt hole bottom reverse pulling device as claimed in claim 3, wherein: each semi-base is provided with a barb mechanism.

5. The anchor cable hole bottom reverse pulling device as claimed in any one of claims 1 to 4, wherein: the barb mechanism comprises a steel pin (3) and a spring (4), one end of the steel pin (3) is hinged to the base (1), and the other end of the steel pin (3) extends out of the base (1) and inclines to one side of the anchor cable hole (200); one end of the spring (4) is connected with the base (1), and the other end of the spring is connected with the steel pin (3).

6. The cable bolt hole bottom reverse pulling device as claimed in claim 5, wherein: the traction mechanism comprises a pulley (2) arranged in the base, one end of the traction rope (22) extends out of the anchor rope hole (200) and is connected with the anchor rope (300), and the other end of the traction rope bypasses the pulley (2) and is connected with external power.

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