CN111441371A - Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method - Google Patents
Self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide and design method Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 61
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- 238000004873 anchoring Methods 0.000 claims abstract description 29
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- 238000007710 freezing Methods 0.000 description 11
- 238000010257 thawing Methods 0.000 description 9
- 230000008014 freezing Effects 0.000 description 8
- 230000003044 adaptive effect Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
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Abstract
The invention discloses a self-balancing anchor cable structure for preventing and treating seasonal frozen soil landslide, which comprises a disc spring energy storage system, a retreat clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a stringing ring, a grouting pipe, a bearing conversion plate and a guide cap, wherein the disc spring energy storage system is arranged on the outer side of the disc spring energy storage system; the disc spring energy storage system is an energy storage component, and reduces the prestress loss when the rock-soil mass generates displacement towards the inner side of the slope and reduces the increment of the axial force of the anchor cable when the rock-soil mass generates displacement towards the outer side of the slope; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchorage device, and the steel strand extends into the protective sleeve and penetrates through the left bearing conversion plate to be connected with a position withdrawing clamping sleeve and a safety clamping sleeve; when the anchor cable structure is used, the prestress can be automatically adjusted according to different working conditions of the special rock-soil body landslide, so that the effectiveness and the durability of the anchoring engineering are ensured; in addition, the invention also discloses a design method of the self-balancing anchor cable structure for preventing and controlling the seasonal frozen soil landslide, which is convenient for realizing the design and manufacture of the anchor cable structure.
Description
Technical Field
The invention relates to a self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide, and further relates to a design method of the self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide, belonging to the technical field of landslide control engineering.
Background
The anchor cable structure is used as a core component of a rock-soil anchoring technology, and can be divided into a tension type anchor cable and a pressure type anchor cable according to the stress mode of the grouting body at the fixed section after the anchor cable is stressed.
In common landslide prevention and cure measure, through anchor section embedding slip bed in stabilizing the ground, the middle part sets up the free section, and counter-force devices such as top layer and frame roof beam cooperate the use, can realize the unified of top layer protection and deep reinforcement. However, under special working conditions, such as earthquake, freezing and thawing cycle, seasonal frozen soil frost heaving thawing reciprocating deformation, etc., it may fail due to excessive prestress loss, or fail due to excessive anchor cable frame structure damage caused by sudden increase of anchoring force. For example, the maximum tension of the anchor rod in the freezing period of a seasonal frozen soil area can reach 2-3 times of that before freezing, the loss of prestress after melting is overlarge, and freezing and thawing local collapse without any sign can occur.
Because the existing landslide is relatively complex in environment, special in rock-soil property and complex in action mechanism, when the existing frame anchor cable technology is applied to landslide control, the stability of the landslide is often improved by increasing the section sizes of frame beams and columns and anchor cables or the length of an anchoring body, the measure not only causes serious material waste, but also cannot solve the problem of durability and reliability of the anchor cables during bidirectional deformation of the landslide, and great potential safety hazards can be buried in landslide control engineering.
The application numbers are: CN201611262415.1, publication no: the CN106522250A patent of the invention discloses a prestressed anchoring structure suitable for freezing and thawing slope reinforcement in a frozen soil area, which comprises a pad pier, wherein the top and the bottom of the left side of the pad pier are provided with slopes, the left side of the pad pier is provided with a steel base plate, the left side of the steel base plate is provided with a freezing and thawing adaptive elastic washer, the left side of the freezing and thawing adaptive elastic washer is provided with an anchor, the outer sides of the anchor, the freezing and thawing adaptive elastic washer and the steel base plate are sleeved with a protective shell, the right side of the pad pier is provided with a gravel anti-freezing layer, and the right side of the gravel anti-freezing layer. The cable has the advantages that the freeze-thaw adaptive elastic washer and the gravel anti-freezing layer are arranged, so that the cable has the effect of preventing deformation when the cable is used; however, when the anchor structure is used, the purpose of preventing the anchor cable from deforming is achieved through the elastic washer and the steel backing plate, and the effect of automatically adjusting the prestress is poor; meanwhile, the stroke is too small, and the prestress range is adjusted.
Therefore, a need exists for a novel anchor cable structure which can adapt to different working conditions of seasonal frozen soil landslide and can automatically adjust prestress.
Disclosure of Invention
The invention aims to overcome the defect that an anchor cable in the prior art cannot adapt to different working conditions of seasonal frozen soil landslide for automatically adjusting prestress, and provides a self-balancing anchor cable structure for preventing and controlling the seasonal frozen soil landslide, wherein the anchor cable structure can automatically adjust the prestress according to different working conditions (the seasonal frozen soil frost heaving and thawing sinking state) of a special rock-soil body landslide when in use so as to ensure the effectiveness and durability of an anchoring project;
in addition, the invention also discloses a design method of the self-balancing anchor cable structure for preventing and controlling the seasonal frozen soil landslide, which is convenient for realizing the design and manufacture of the anchor cable structure.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the basic concept of the invention is as follows:
the invention mainly comprises a disc spring energy storage system, a retreat clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a stringing ring, a grouting pipe and a guide cap.
The disc spring energy storage system mainly comprises disc spring members formed by overlapping and involutory combination, and the effective load, the limit load, the effective stroke and the limit stroke of the disc spring energy storage system are designed according to the parameter index requirements of the anchor cable; the main function of the device is energy storage, and the prestress loss is reduced when rock and soil mass moves towards the inner slope; when rock and soil mass generates displacement towards the outside of the slope, the increment of the axial force of the anchor cable is reduced;
the retreating clamping sleeve mainly comprises an extrusion sleeve and a special spring steel wire, and the initial retreating pressure can be set as required;
the safety cutting sleeve mainly comprises a special extrusion sleeve, and the cutting sleeve is tightly contacted with the steel stranded wire and cannot slip before the steel stranded wire is broken;
the protective sleeve mainly comprises a cylindrical shell and a sealing bottom plate, and is used for protecting the retreating clamping sleeve and the safety clamping sleeve;
the steel strand, the wire frame ring, the grouting pipe and the guide cap are all manufactured according to a traditional anchor cable manufacturing method.
The specific scheme of the invention is as follows:
a self-balancing anchor cable structure for preventing and treating seasonal frozen soil landslide comprises a disc spring energy storage system, a retreat clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a stringing ring, a grouting pipe, a bearing conversion plate and a guide cap; the protective sleeve comprises a shell in a cylindrical structure and a sealing bottom plate connected to the bottom of the shell; the protecting sleeve forms a free section of the anchor cable structure, one end of the steel strand is connected with a guide cap at the end part after being connected through a plurality of stringing rings, and the steel strand, the stringing rings and the guide cap form an anchoring section of the anchor cable structure; the force-bearing conversion plates are arranged in the protective sleeve, and the two force-bearing conversion plates are connected through a connecting part; the steel strand of the anchoring section sequentially penetrates through the sealing bottom plate and the right bearing conversion plate and then is tightly connected with a safety clamping sleeve at the end part of the steel strand; the disc spring energy storage system is an energy storage component, and reduces the prestress loss when the rock-soil mass generates displacement towards the inner side of the slope and reduces the increment of the axial force of the anchor cable when the rock-soil mass generates displacement towards the outer side of the slope; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchorage device, and the steel strand extends into the protective sleeve and penetrates through the left bearing conversion plate to be connected with a position withdrawing clamping sleeve and a safety clamping sleeve; and after the grouting pipe penetrates through the side wall of the protective sleeve and the left and right bearing conversion plates, the end part of the grouting pipe extends to the bottom of the anchoring section.
Further optimized, the disc spring energy storage system is mainly composed of single disc springs in a superposition and involution mode.
In the invention, the retreating cutting sleeve mainly comprises an extrusion sleeve and a spring steel wire, and the initial retreating pressure of the retreating cutting sleeve can be set as required.
The safety clamping sleeve comprises an extrusion sleeve, and the extrusion sleeve is tightly connected with the steel strand.
The invention also discloses a self-balancing anchor cable structure design method for preventing and controlling the seasonal frozen soil landslide, which specifically comprises the following steps:
step 1: landslide investigation is carried out, the lithology of the landslide and the deformation quantity of the pointing slope inside and outside which can be generated under various working conditions are found out, and the length and the tonnage of the anchor cable are designed;
step 2: after the step 1 is completed, designing effective load, ultimate load, effective stroke and ultimate stroke of the disc spring energy storage system and equivalent elastic coefficient of the disc spring energy storage system;
and step 3: according to the result of the step 2, referring to a mechanical handbook, and carrying out disc spring structure design according to the effective load, the limit load, the effective stroke and the limit stroke of the disc spring energy storage system and the equivalent elasticity coefficient of the disc spring energy storage system;
and 4, step 4: designing a safety cutting sleeve and a position withdrawing cutting sleeve according to the limit load and the limit stroke; when the anchoring force of the earthquake or large deformation action is larger than the design yield force N1In time, the withdrawing sleeve plays a role in maintaining the working anchoring force N0。
Further, the specific process of step 2 is as follows,
for the tension locking state, the anchor is taken as a research object, and the mechanical balance state is as follows:
in the formula, E-steel strand elastic modulus; l-the length of the free section of the steel strand; delta l-elongation of the steel strand in the tensioning process; n-the number of steel strands; s-effective area of steel strand; k-equivalent elastic coefficient of the disc spring energy storage system; x is the number of0-disc spring energy storage system compression during tensioning;
when the displacement generated by landslide is x, setting the displacement increment variable quantity delta x of the anchor cable relative to the locking state1Displacement increment delta x of disc spring energy storage system2Then the displacement obviously satisfies:
Δx1+Δx2＝x (2)
at this time, the anchorage device is taken as a research object, and the mechanical equilibrium state is as follows:
the equivalent elasticity coefficient of the disc spring energy storage system is obtained by combining the vertical type (1), the formula (2) and the formula (3):
x/Δx1the larger the displacement is, the smaller the displacement transmitted to the self-balancing anchor cable by the displacement generated by landslide is, the smaller the equivalent elastic coefficient of the required disc spring energy storage system is, and the change of the internal force of the anchor cable is the minimum at the moment.
Compared with the prior art, the invention has the following beneficial effects:
when the device is actually used, the prestress can be automatically adjusted according to different working conditions (seasonal frozen soil frost heaving and thawing sinking) of the landslide of the special rock-soil mass, so that the effectiveness and the durability of the anchoring engineering are ensured; and moreover, the anti-seismic device has better anti-seismic performance.
More importantly, in actual use, when landslide is greatly deformed, the disc spring energy storage system can act in cooperation with the retreat clamping sleeve, deformation resistance and shock resistance of the anchor cable structure are improved, and effectiveness and durability of anchoring engineering are further guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention under the action of frost heaving.
Fig. 3 is a schematic view of the overall structure state of the invention during large deformation of landslide.
Fig. 4 is a diagram of the mechanism of the present invention and a conventional anchor cable structure in actual use.
Reference numerals: 1, a disc spring energy storage system, 2 grouting pipes, 3 protective sleeves and 4 withdrawing clamping sleeves; 5 safety cutting sleeve, 6 sealing bottom plate, 7 steel strand, 8 anchorage device, 9 loop, 10 guide cap, 11 bearing conversion plate, 12 free section and 13 anchoring section.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Example 1
The embodiment discloses a self-balancing anchor cable structure for preventing and treating seasonal frozen soil landslide, which comprises a disc spring energy storage system 1, a retreat clamping sleeve 4, a safety clamping sleeve 5, a protective sleeve 3, a steel strand 7, a stringing ring 9, a grouting pipe 2, a force-bearing conversion plate 11 and a guide cap 10;
the protective sleeve 3 comprises a shell in a cylindrical structure and a sealing bottom plate 6 connected to the bottom of the shell;
the protective sleeve 3 forms a free section 12 of the anchor cable structure, one end of the steel strand 7 is connected with a guide cap 10 at the end after being connected through a plurality of stringing rings 9, the steel strand 7, the stringing rings 9 and the guide cap 10 form an anchoring section 13 of the anchor cable structure, and in the embodiment, two stringing rings 9 are arranged;
the force-bearing conversion plates 11 are arranged in the protective sleeve 3, the number of the force-bearing conversion plates 11 is two, and the force-bearing conversion plates 11 are connected through connecting parts;
the steel strand 7 of the anchoring section 13 sequentially passes through the sealing bottom plate 6 and the right bearing conversion plate 11 and then is tightly connected with a safety cutting sleeve 5 at the end part of the steel strand 7;
the disc spring energy storage system 1 is an energy storage component, and reduces prestress loss when rock and soil mass generates displacement towards the inner side of a slope and reduces increment of axial force of an anchor cable when the rock and soil mass generates displacement towards the outer side of the slope; the disc spring energy storage system 1 is positioned at the left end of the protective sleeve 3 and is connected with a steel strand 7 through an anchorage device 8, and the steel strand 7 extends into the protective sleeve 3 and penetrates through the left bearing conversion plate 11 to be connected with a back-off clamping sleeve 4 and a safety clamping sleeve 5;
after the grouting pipe 2 penetrates through the side wall of the protective sleeve 3 and the left and right bearing conversion plates 11, the end part of the grouting pipe 2 extends to the bottom of the anchoring section 13; i.e. the end of the injection pipe 2 extends to the guide cap.
In this embodiment, the disc spring energy storage system 1 is mainly composed of single disc springs in a manner of overlapping and involution.
The withdrawing cutting sleeve 4 mainly comprises an extrusion sleeve and a spring steel wire, wherein the spring steel wire can be a spring, and the initial withdrawing pressure of the withdrawing cutting sleeve 4 can be set as required; the structure is as follows: the inner diameter of the extrusion sleeve is larger than the outer diameter of the steel strand 7, the spring is arranged between the steel strand 7 and the extrusion sleeve, the extrusion sleeve is tightly attached to the spring and the steel strand 7 during extrusion, and the spring is extruded when the steel strand 7 moves.
Wherein, safe cutting ferrule 5 includes the extrusion cover, and the extrusion cover is connected with steel strand wires 7 zonulae occludens.
In this embodiment, the number of the steel strands 7 in the free section 12 and the anchor section 03 is the same.
The invention is further explained below by combining a design method of a self-balancing anchor cable structure for preventing and controlling seasonal frozen soil landslide:
the self-balancing anchor cable structure design method for preventing and controlling the seasonal frozen soil landslide specifically comprises the following steps:
step 1: landslide investigation is carried out, the lithology of the landslide and the deformation quantity of the pointing slope inside and outside which can be generated under various working conditions are found out, and the length and the tonnage of the anchor cable are designed;
step 2: after the step 1 is completed, designing effective load, ultimate load, effective stroke and ultimate stroke of the disc spring energy storage system 1 and equivalent elastic coefficient of the disc spring energy storage system;
and step 3: according to the result of the step 2, referring to a mechanical handbook, and carrying out disc spring structure design according to the effective load, the limit load, the effective stroke and the limit stroke of the disc spring energy storage system 1 and the equivalent elasticity coefficient of the disc spring energy storage system;
and 4, step 4: designing a safety cutting sleeve 5 and a retreat cutting sleeve 4 according to the limit load and the limit stroke; when the anchoring force of the earthquake or large deformation action is larger than the design yield force N1In time, the withdrawing cutting sleeve 4 plays a role of maintaining the working anchoring force N0。
Wherein the specific process of the step 2 is as follows,
for the tension locking state, the anchorage device 8 is taken as a research object, and the mechanical balance state is as follows:
in the formula, the E-steel strand 7 has an elastic modulus; l-the length of the free section 12 of the steel strand 7; delta l is the elongation of the steel strand 7 in the tensioning process; n-the number of steel strands 7; s-effective area of the steel strand 7; k-equivalent elastic coefficient of the disc spring energy storage system; x is the number of0-disc spring energy storage system compression during tensioning;
when the displacement generated by landslide is x, setting the displacement increment variable quantity delta x of the anchor cable relative to the locking state1Displacement increment delta x of disc spring energy storage system2Then the displacement obviously satisfies:
Δx1+Δx2＝x (2)
in this case, the anchor 8 is a study object, and the mechanical equilibrium state is as follows:
the equivalent elasticity coefficient of the disc spring energy storage system is obtained by combining the vertical type (1), the formula (2) and the formula (3):
x/Δx1the larger the displacement is, the smaller the displacement transmitted to the self-balancing anchor cable by the displacement generated by landslide is, the smaller the equivalent elastic coefficient of the required disc spring energy storage system is, and the change of the internal force of the anchor cable is the minimum at the moment.
The invention is further illustrated below with reference to specific control examples of frozen soil landslides:
implementation objects are as follows: a certain seasonal frozen soil landslide;
details of the implementation subject: the plane shape is tongue-shaped, the slope direction is 325 degrees, the length is 350m, the width is 200m, the sliding surface burial depth is 15 m-18 m, and the sliding substance is the fourth series residual product (Q4)el) The thickness of the clay and the seasonal frozen soil is about 2.2m, and the free frost heaving rate is 4%. Under the condition of restriction, the maximum value of frost heaving and thaw collapse deformation of the landslide is about 30mm, the sliding bed is relatively stable mudstone, and the sliding surface is a foundation-covering interface.
The landslide is treated by adopting a lattice anchor cable project, the tonnage of the anchor cable is 400kN, the anchor cable adopts 4 steel strands 7, the length of a free section of the anchor cable is 12m, and according to calculation, if a traditional anchor cable is adopted, frost heaving force 168KN can be generated when frost heaving deformation is 40mm, and the anchor cable and a sash can be damaged; when the melting and sinking deformation is 40mm, the prestress loss can be 168KN, the prestress loss of the anchor cable is large, and the landslide control project can be out of work.
Therefore, a self-balancing anchor cable structure suitable for preventing and controlling seasonal frozen soil landslide is adopted.
The specific implementation steps are as follows:
s1: setting the design targets as follows: x/Deltax1When the displacement generated by landslide is transmitted to the anchor cable, the displacement is attenuated by half, namely when the frost heaving deformation is 30mm under the extreme working condition, only 84KN of frost heaving force is generated; when the melting and sinking deformation is 30mm under the extreme working condition, only 84KN of prestress loss is generated;
s2: calculating the equivalent elastic coefficient of the self-balancing anchor cable disc spring energy storage system according to the formula (4); according to different working states of the anchor cable, setting the effective load of the disc spring energy storage system 1 to be 400kN, the ultimate load to be 550kN, the displacement corresponding to the effective load to be 30mm, and the ultimate displacement to be 60 mm;
s3: according to the result of S1, the structural design of the disc spring energy storage system 1 is carried out according to the mechanical manual, the outer diameter of the disc spring is finally determined to be 250mm, the inner diameter of the disc spring is finally determined to be 112mm, the thickness of the disc spring is finally determined to be 12mm, the free height of the disc spring is determined to be 19.4mm, and the grouping mode is as follows: 2 pieces of disc rings are overlapped and then involuted, and 18 pieces of disc rings are needed;
s4: setting the rated working load of the retreating clamping sleeve 4 to be 500kN, namely when the anchor cable is more than 500kN, the retreating clamping sleeve 4 plays a role;
s5: according to the design, a disc spring energy storage system 1 is manufactured and formed by overlapping and involutory combination of single disc rings;
s6: according to the design specification, manufacturing a protective sleeve 3 and a sealing bottom plate 6, and manufacturing a bearing conversion plate 11;
s7: according to the design specification, preparation retreat cutting ferrule 4 comprises extrusion housing and internal spring (spring wire), and its structure specifically as follows: the inner diameter of the extrusion sleeve is larger than the outer diameter of the steel strand 7, the spring is positioned between the steel strand 7 and the extrusion sleeve, and the extrusion sleeve is tightly attached to the spring and the steel strand 7 during extrusion; manufacturing a safety clamping sleeve 5 which is tightly contacted with the steel stranded wire 7 and cannot slip before the steel stranded wire 7 is broken;
s8: assembling a self-balancing anchor cable structure according to the anchor cable structure schematic diagram; firstly, a disc spring energy storage system 1, a retreating cutting sleeve 4 and a protective sleeve 3 are assembled, and a steel strand 7, a stringing ring 9, a grouting pipe 2 and a guide cap 10 are manufactured according to a traditional anchor cable manufacturing method;
s9: erecting a bent frame according to relevant construction specifications, and drilling according to the aperture and the hole depth required by the design;
s10: putting the assembled self-balancing anchor cable structure into a drill hole;
s11: grouting according to relevant construction specifications, and protecting an orifice;
s12: after the slurry strength meets the design requirement, each steel strand 7 is pre-tensioned to ensure that the stress is uniform, and the phenomenon of eccentric tension or non-uniform stress is not generated. And then tensioning and locking the anchor cable according to the designed anchoring force.
Referring to fig. 4, in fig. 4, a broken line represents a conventional anchor cable, and a solid line represents an intelligent anchor cable, that is, an anchor according to the present inventionAnd (4) cable structure. Its rated working anchoring force is N0Under the working condition that the landslide generates deformation pointing to the interior of the slope (frozen soil is thawed), the disc spring energy storage system 1 plays a role in compensating most of prestress loss caused by displacement pointing to the interior of the slope; under the working condition that the landslide generates deformation pointing out of the slope (frozen soil frost heaving) and the anchoring force is smaller than the design yield force N1In time, the disc spring energy storage system 1 plays a role, and the prestress increment is greatly reduced; when the anchoring force of the earthquake or large deformation action is larger than the design yield force N1In time, the retreat cutting sleeve 4 plays a role and can maintain the anchoring force N0The method is not increased rapidly, and the effectiveness of the anchor cable engineering under extreme working conditions is maintained.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a self-balancing anchor rope structure for seasonally frozen soil landslide prevention and cure which characterized in that: the device comprises a disc spring energy storage system, a retreat clamping sleeve, a safety clamping sleeve, a protective sleeve, a steel strand, a stringing ring, a grouting pipe, a bearing conversion plate and a guide cap;
the protective sleeve comprises a shell in a cylindrical structure and a sealing bottom plate connected to the bottom of the shell;
the protecting sleeve forms a free section of the anchor cable structure, one end of the steel strand is connected with a guide cap at the end part after being connected through a plurality of stringing rings, and the steel strand, the stringing rings and the guide cap form an anchoring section of the anchor cable structure;
the force-bearing conversion plates are arranged in the protective sleeve, and the two force-bearing conversion plates are connected through a connecting part;
the steel strand of the anchoring section sequentially penetrates through the sealing bottom plate and the right bearing conversion plate and then is tightly connected with a safety clamping sleeve at the end part of the steel strand;
the disc spring energy storage system is an energy storage component, and reduces the prestress loss when the rock-soil mass generates displacement towards the inner side of the slope and reduces the increment of the axial force of the anchor cable when the rock-soil mass generates displacement towards the outer side of the slope; the disc spring energy storage system is positioned at the left end of the protective sleeve and is connected with a steel strand through an anchorage device, and the steel strand extends into the protective sleeve and penetrates through the left bearing conversion plate to be connected with a position withdrawing clamping sleeve and a safety clamping sleeve;
and after the grouting pipe penetrates through the side wall of the protective sleeve and the left and right bearing conversion plates, the end part of the grouting pipe extends to the bottom of the anchoring section.
2. The self-balancing anchor cable structure for seasonal frozen soil landslide control of claim 1, wherein: the disc spring energy storage system is mainly composed of single disc springs in a superposition and involution mode.
3. The self-balancing anchor cable structure for seasonal frozen soil landslide control of claim 1, wherein: the retreating clamping sleeve mainly comprises an extrusion sleeve and a spring steel wire, and the initial retreating pressure of the retreating clamping sleeve can be set as required.
4. The self-balancing anchor cable structure for seasonal frozen soil landslide control of claim 1, wherein: the safety cutting sleeve comprises an extrusion sleeve, and the extrusion sleeve is tightly connected with the steel strand.
5. A self-balancing anchor cable structure design method for preventing and controlling seasonal frozen soil landslide is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
step 1: landslide investigation is carried out, the lithology of the landslide and the deformation quantity of the pointing slope inside and outside which can be generated under various working conditions are found out, and the length and the tonnage of the anchor cable are designed;
step 2: after the step 1 is completed, designing effective load, ultimate load, effective stroke and ultimate stroke of the disc spring energy storage system and equivalent elastic coefficient of the disc spring energy storage system;
and step 3: according to the result of the step 2, referring to a mechanical handbook, and carrying out disc spring structure design according to the effective load, the limit load, the effective stroke and the limit stroke of the disc spring energy storage system and the equivalent elasticity coefficient of the disc spring energy storage system;
and 4, step 4: designing a safety cutting sleeve and a position withdrawing cutting sleeve according to the limit load and the limit stroke; when the anchoring force of the earthquake or large deformation action is larger than the design yield force N1In time, the withdrawing sleeve plays a role in maintaining the working anchoring force N0。
6. The design method of the self-balancing anchor cable structure for preventing and controlling the seasonal frozen soil landslide as claimed in claim 5, wherein the design method comprises the following steps: the specific procedure of step 2 is as follows,
for the tension locking state, the anchor is taken as a research object, and the mechanical balance state is as follows:
in the formula, E-steel strand elastic modulus; l-the length of the free section of the steel strand; delta l-elongation of the steel strand in the tensioning process; n-the number of steel strands; s-effective area of steel strand; k-equivalent elastic coefficient of the disc spring energy storage system; x is the number of0-disc spring energy storage system compression during tensioning;
when the displacement generated by landslide is x, setting the displacement increment variable quantity delta x of the anchor cable relative to the locking state1Displacement increment delta x of disc spring energy storage system2Then the displacement obviously satisfies:
Δx1+Δx2＝x (2)
at this time, the anchorage device is taken as a research object, and the mechanical equilibrium state is as follows:
the equivalent elasticity coefficient of the disc spring energy storage system is obtained by combining the vertical type (1), the formula (2) and the formula (3):
x/Δx1the larger the displacement is, the smaller the displacement transmitted to the self-balancing anchor cable by the displacement generated by landslide is, the smaller the equivalent elastic coefficient of the required disc spring energy storage system is, and the change of the internal force of the anchor cable is the minimum at the moment.
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