Anchor cable component with variable-diameter reinforcement cage

Abstract

The anchor cable component with the variable-diameter reinforcement cage comprises an anchor cable set and the variable-diameter reinforcement cage connected to the anchor cable set, and the variable-diameter reinforcement cage comprises a lower anchoring part, an upper anchoring part and a vertical rib set; anchor cables of the anchor cable group penetrate through the upper anchoring part and then are fixed on the lower anchoring part, and vertical ribs of the vertical rib group are hinged to the lower anchoring part and the upper anchoring part; an upper drill rod hole and a lower drill rod hole are formed in the upper anchoring part and the lower anchoring part respectively, and the vertical rib can be changed from a contracted state to an opened state by pushing the upper anchoring part towards the lower anchoring part; the rotary jet grouting drill rod can feed an anchor cable component into an anchor cable hole, and after construction of the expansion head containing cavity is completed, the upper anchoring part is pushed towards the lower anchoring part, so that a vertical rib is in an open state from a contraction state; according to the anchor cable component, the rotary jet grouting drill rod can be inserted into the anchor cable hole, the vertical rib is opened, the moving distance of the vertical rib is determined through the rotary jet grouting drill rod, the vertical rib reaches the set position, and the quality of an expanded head of a variable-diameter reinforcement cage is guaranteed.

Description

Technical Field

[0001] The utility model relates to an anchor cable component carrying a variable diameter steel bar cage. Background Art

[0002] In the existing technology, a variable diameter steel cage is often used to improve the stability of the anchor cable in the foundation to improve the pull-out resistance of the anchor cable. The variable diameter steel cage needs to pass through the thinner anchor cable hole at the upper part to reach the bottom of the anchor cable hole and enter the reserved enlarged head cavity. Then the variable diameter steel cage in the contracted state is opened, and finally pure cement slurry or concrete is injected into the enlarged head cavity. The pure cement slurry or concrete is wrapped on the variable diameter steel cage in the open state to form a variable diameter steel cage enlarged head.

[0003] When constructing anchor holes, dry operations are mainly used to make the anchor holes empty. Then, the steel cable carrying the variable diameter steel cage is sent into the anchor hole, and then grouting is performed. After the slurry reaches the set strength, prestressing is performed. When dry operations are used, it is difficult to completely empty the expansion head chamber. Some earth will remain in the expansion head chamber to a greater or lesser extent. Moreover, when the anchor cable enters the anchor hole, the hole wall will collapse due to the contact of the variable diameter steel cage. Moreover, since the existing variable diameter hoop reinforcement cage relies on its own elastic mechanism to push the vertical bars of the variable diameter steel cage outward to reach its set position when it is opened, the earth remaining in the expansion head chamber will hinder the movement of the vertical bars, and the vertical bars cannot reach their set position, causing the variable diameter steel cage to be in a semi-open state, affecting the strength of the expansion head of the variable diameter steel cage.

[0004] However, in soft soil areas, anchor holes cannot be constructed using dry methods due to the easy collapse of the holes. Instead, wet methods with slurry wall protection can be used to construct the anchor holes. However, in actual construction, the silt in the anchor holes is difficult to remove completely, which also results in the inability to fully open the variable diameter steel cage. The retained silt easily forms cement slurry wrapped around the soil, making it impossible to form the desired enlarged head, resulting in a reduction in the bearing capacity of the enlarged head and making it difficult to control the construction quality. Utility Model Content

[0005] In order to solve the problem in the above-mentioned prior art that the quality of the enlarged head is affected by the collapse of the anchor hole or the retention of earth, mud, etc., the present application proposes an anchor cable component carrying a variable diameter steel cage, which can be inserted into the anchor hole formed by the rotary spraying process; the anchor cable component includes an anchor cable group and a variable diameter steel cage connected to the anchor cable group, the variable diameter steel cage includes a lower anchoring portion, an upper anchoring portion and a vertical reinforcement group, the anchor cable group includes 2-10 anchor cables that are parallel to each other and extend along the first axis, and the two ends of each anchor cable are respectively formed as an anchor end and a tensioning end;

[0006] The upper anchoring portion and the lower anchoring portion are spaced apart along the first axis direction, the 2-10 anchor cables are spaced apart around a central axis, and the anchoring ends of the anchor cables freely pass through the upper anchoring portion and are then fixed to the lower anchoring portion, so that the lower anchoring portion is located on the side of the upper anchoring portion away from the tensioning end;

[0007] The vertical reinforcement group includes a plurality of vertical reinforcements spaced around the anchor cable group. Each vertical reinforcement has an upper hinged reinforcement and a lower hinged reinforcement. The two ends of the upper hinged reinforcement are respectively hinged to the end of the corresponding vertical reinforcement facing the tensioning end and the upper anchoring portion. The two ends of the lower hinged reinforcement are respectively hinged to the end of the corresponding vertical reinforcement facing away from the tensioning end and the lower anchoring portion. The soft rope stirrups are wrapped around the vertical reinforcement group.

[0008] An upper drill rod hole is provided on the upper anchoring portion, and a lower drill rod hole is provided on the lower anchoring portion, wherein the upper drill rod hole and the lower drill rod hole are coaxially arranged in the direction of the first axis; pushing the upper anchoring portion toward the lower anchoring portion can cause the vertical reinforcement to move from a contracted state to an open state;

[0009] The jet-jet drill pipe can deliver the anchor cable component into the anchor cable hole, and after completing the construction of the enlarged head cavity, it pushes the upper anchoring part toward the lower anchoring part, so that the vertical reinforcement moves from the contracted state to the open state;

[0010] The lower end of the rod body of the rotary jet drill rod is radially reduced to form a reduced diameter section and a step surface facing the lower end face of the rotary jet drill rod, and a grouting hole is provided at least at the lower end of the reduced diameter section; the reduced diameter section can pass through the upper drill rod hole and the lower drill rod hole in sequence, so that the step surface is pressed against the edge of the lower drill rod hole facing the upper anchoring part, and the anchor cable component is sent into the anchor cable hole; and the rotary jet drill rod can be lifted toward the outside of the anchor cable hole after completing the construction of the expanded head cavity, and after the step surface reaches the side of the upper anchoring part away from the lower anchoring part, the step surface is pressed against the edge of the upper drill rod hole away from the lower anchoring part, and the upper anchoring part is pushed toward the lower anchoring part, so that the vertical reinforcement is changed from a contracted state to an open state.

[0011] The anchor cable component in the present application is used to be inserted into an anchor cable hole formed by a rotary jetting process. The anchor cable hole contains cement soil formed by a mixture of cement slurry and earthwork. The supporting effect of the cement soil prevents the collapse of the anchor cable hole. When installing the anchor cable component, it is necessary to use the step surface on the rotary jetting drill rod to feed the steel structure into the anchor cable hole. The rotary jetting drill rod then sprays cement slurry to expand the anchor rod hole, forming an enlarged head cavity where the variable diameter steel cage is located. After the construction of the enlarged head cavity is completed, the rotary jetting anchor rod is moved outward until the step surface can press against the side of the upper drill rod hole away from the lower anchoring part. The step surface is then pressed against the side of the upper drill rod hole away from the lower anchoring part, and the upper anchoring part is pushed toward the lower anchoring part, so that the vertical reinforcement moves from a contracted state to an open state. While forming the enlarged head cavity, the ejected cement slurry mixes with the earthwork to form cement soil and wraps around the variable diameter steel cage. There are no independent soil or silt blocks, thus avoiding the formation of cement slurry wrapping soil.

[0012] The anchor cable component in this application can be inserted into the anchor cable hole using a rotary jet drill rod and the vertical reinforcement can be opened. Since the moving distance of the rotary jet drill rod can be visually confirmed, the moving distance of the vertical reinforcement can be guaranteed and the vertical reinforcement can reach its set position, thereby ensuring the quality of the enlarged head of the variable diameter steel bar cage.

[0013] Specifically, the upper anchoring portion includes an upper pressure plate and an upper hinge ring formed on the side of the upper pressure plate facing the lower anchoring portion, the outer diameter of the upper hinge ring is smaller than the outer diameter of the upper pressure plate, and the upper hinge rib is hinged on the upper hinge ring;

[0014] The lower anchoring portion includes a lower pressure plate and a lower hinge ring formed on the side of the lower pressure plate facing the upper anchoring portion, the outer diameter of the lower hinge ring is smaller than the outer diameter of the lower pressure plate, and the lower hinge rib is hinged on the lower hinge ring;

[0015] When the vertical reinforcement is in a contracted state, one end of the upper hinge reinforcement away from the upper anchor portion extends along an inclined direction toward the lower anchor portion, and one end of the lower hinge reinforcement away from the lower anchor portion extends along an inclined direction toward the upper anchor portion;

[0016] When the vertical reinforcement is in the open state, the side of the upper hinge reinforcement away from the lower anchoring portion can be pressed against the upper pressure plate, and the side of the lower hinge reinforcement away from the upper anchoring portion can be pressed against the lower pressure plate.

[0017] The above structure allows the vertical bars to smoothly transition from a contracted state to an open state. Because the vertical bars, upper hinge bars, lower hinge bars, and anchor cable assembly form a four-bar linkage structure with instability, the upper and lower pressure plates, respectively, squeeze and limit the upper and lower hinge bars, fixing the position of the vertical bars when they are open. This position serves as the set position for the vertical bars when they are open, thereby ensuring that the shape and strength of the expanded head meet the set requirements.

[0018] Furthermore, in order to smoothly fix the lower anchoring part on each anchor cable, the lower anchoring part includes a lower pressure plate. Corresponding to each anchor cable, an anchor hole in the form of a through hole is provided on the lower pressure plate. The end of the anchor hole facing away from the upper anchoring part is formed into a conical hole with the small end facing the upper anchoring part. A clip group is arranged in the conical hole, and an extrusion plate is provided on the side of the lower pressure plate facing away from the upper anchoring part. The locking bolt connects the extrusion plate to the lower pressure plate, and the extrusion plate tightly squeezes the clips in the clip group into the conical hole, so that the anchor cable is fixed to the lower pressure plate through the clip group.

[0019] The lower bearing plate and the clip assembly together form a clip-type anchor, which offers the advantages of easy operation and stable clamping, making it a conventional anchor for cable anchors. However, it requires the tension of the cable to lock the cable. Before the cable is tensioned, the clip is in a relaxed state, which cannot ensure that the lower anchor portion is stably retained on the cable. In this design, a compression plate is used to pre-compress the clip, allowing it to lock the cable to the lower anchor portion, preventing the lower anchor portion from slipping off the cable or partial cable dislodging from the lower anchor portion, thus preventing subsequent prestressing.

[0020] Furthermore, corresponding to each anchor cable, there is a set of extrusion tubes provided on the anchor cable between the compression plate and the clamping piece group. The compression plate presses the extrusion tube tightly against the clamping piece, and the end of the compression tube facing the clamping piece only presses against the end face of the clamping piece. In actual construction, the clamping piece may be completely accommodated in the conical hole. In this case, the compression plate alone cannot press the clamping piece tightly against the conical hole, which may easily lead to insufficient locking force of the clamping piece on the anchor cable. As a result, during the subsequent prestressing, the anchor cable may fall out of the anchor hole, and the prestressing cannot be completed. By using the compression tube to eliminate the above problem, it can be ensured that the clamping piece can tightly lock the anchor cable on the lower anchoring part.

[0021] Furthermore, in order to ensure that the step surface on the jet grouting drill pipe can smoothly push the upper anchoring part so that the vertical reinforcement reaches the open state, an elastic positioning mechanism is fixedly installed on the side of the upper anchoring part away from the lower anchoring part, and the elastic positioning mechanism includes at least one elastic positioner, and each elastic positioner includes a shell, a positioning rod and an elastic member. The shell has a guide cavity extending in the radial direction, and the guide cavity has an opening facing the central axis. The elastic member is arranged in the guide cavity, and the positioning rod is slidably inserted into the guide cavity through the opening of the guide cavity. Under the action of external force, the positioning rod can compress the elastic member. When the external force is removed, the positioning rod can move toward the central axis under the push of the elastic member.

[0022] When the stepped surface of the jet-jet drill pipe presses against the lower anchoring portion, the positioning rod presses against the jet-jet drill pipe and compresses the elastic member; when the jet-jet drill pipe is lifted toward the outside of the anchor hole and the stepped surface reaches the side of the positioning rod facing away from the upper anchoring portion, the elastic member can push the positioning rod outward, causing the positioning rod to press against the reduced diameter section, thereby causing the stepped surface to press against the side of the positioning rod facing away from the upper anchoring portion and pushing the upper anchoring portion toward the lower anchoring portion, causing the vertical reinforcement to move from a contracted state to an open state. The above-mentioned radial direction refers to a direction perpendicular to and passing through the central axis. When the anchor cable component is inserted into the anchor cable hole, this radial direction is actually the radial direction of the anchor cable hole.

[0023] When the anchor hole is set at an angle, the lower end of the rotary jet drill rod will bend downward slightly due to gravity. When the bend is large enough, the bend and the offset of the rotary jet drill rod can be used to press the step surface against the edge of the upper drill rod hole. However, since the anchor hole is formed by the rotary jet process in this application, the anchor hole is filled with cement soil formed by a mixture of cement slurry and earthwork, which has a supporting effect on the rotary jet drill rod and can reduce the bending amount of the rotary jet drill rod. In addition, during actual construction, since it is impossible to directly observe the internal situation of the anchor hole, operations can only be performed based on experience, and the reliability is low. Using the bending and offset of the drill rod anchor to press the step surface against the edge of the upper drill rod hole often requires multiple operations to complete, and the construction efficiency is low.

[0024] The elastic member in the elastic locator is used to push the positioning rod, forcing the positioning rod to press against the outer peripheral surface of the reduced diameter section, so that the step surface can press against the side of the positioning rod facing the outside of the anchor hole, thereby indirectly pressing the step surface against the edge of the upper drill rod hole away from the lower anchor through the positioning rod, ensuring that the jet-jet drill rod can push the upper anchor part and make the vertical reinforcement reach the open state. Since the positioning rod is surrounded by cement slurry, during actual construction, it is necessary to test and test the thrust of the elastic member to ensure that the elastic member can overcome the resistance of the cement slurry and press the positioning rod against the outer peripheral surface of the reduced diameter section. The elastic member can specifically be a cylindrical helical compression spring, a rubber block, an elastic sheet or other elastic member.

[0025] Furthermore, to ensure that the lower end of the variable diameter steel cage is completely encased in cement slurry, when the stepped surface presses against the edge of the lower drill rod hole facing the upper anchor portion, the lowest grouting hole on the jet grouting drill rod, in the direction from the tensioning end to the anchoring end, can extend beyond the end face of the vertical bar facing away from the tensioning end when in the open position. That is, when the anchor cable member is inserted into the anchor cable hole, when the stepped surface presses against the edge of the lower drill rod hole facing the upper anchor portion, the lowest grouting hole on the jet grouting drill rod can extend beyond the lower end face of the vertical bar when in the open position.

[0026] The jet grouting holes of the jet grouting drill pipe are designed to meet different needs. One or more groups of holes are arranged along the axial direction of the jet grouting drill pipe. When only one group of holes is provided, it is the lowest group of holes. Within the anchor hole, the lowest group of holes can be used to spray the lower side of the variable diameter steel cage, completely enveloping the lower end of the variable diameter steel cage in cement grout.

[0027] When any of the above-mentioned anchor cable components is used to form an anchor cable structure, two construction methods can be used for construction. The steps of the first construction method are as follows:

[0028] (1) Use the jet-jet drill pipe to spray cement slurry and construct the anchor hole;

[0029] (2) Pull out the jet grouting drill pipe, then pass the reduced diameter section of the jet grouting drill pipe through the upper drill pipe hole and the lower drill pipe hole in turn, and make the step surface press against the upper edge of the lower drill pipe hole, and insert the steel structure with the vertical reinforcement in the contracted state into the anchor hole; when the variable diameter steel cage reaches the set position of the anchor hole, the grouting hole of the jet grouting drill pipe reaches the upper set position of the enlarged head, and then continue to spray cement slurry to expand the anchor hole, while continuing to push the steel structure downward until the grouting hole reaches the lower set position of the enlarged head;

[0030] Lift the jet grouting drill rod upwards. When the step surface reaches the upper side of the upper drill rod hole, press the step surface against the upper edge of the upper drill rod hole. Then push the upper anchor portion downwards to open the vertical reinforcement from the contracted state, and then pull out the jet grouting drill rod.

[0031] (3) When the cement soil in the anchor hole reaches the set strength, the anchor cables of the anchor cable group are tensioned to generate prestress and anchor; the variable diameter steel cage and the surrounding cement soil together form an enlarged head.

[0032] In this construction method, first, the anchor hole is formed by the rotary grouting method, so that the anchor hole is filled with cement soil formed by a mixture of cement slurry and earthwork. The support of the cement soil is used to avoid the collapse of the inner wall of the anchor hole, thereby avoiding the problem of the variable diameter steel cage being blocked from moving in the anchor hole and unable to reach the set position due to the collapse of the inner wall of the anchor hole in the dry anchor hole or the wet hole drilling with mud wall protection in the prior art.

[0033] This construction method is suitable for soils containing unbreakable rocky impurities that could hinder the movement of the variable-diameter steel cage. As the jet-jet drill pushes the variable-diameter steel cage, when the jet-jet drill's grouting holes reach the upper, set position of the enlarged head, the jet-jet drill resumes its cement slurry injection, simultaneously expanding the anchor hole to form the enlarged head cavity and stirring the rocky impurities within the anchor hole to eliminate any obstruction to the advancement of the variable-diameter steel cage until the grouting holes reach the lower, set position of the enlarged head. In this construction method, while the variable-diameter steel cage is pushed to its set position, the jet-jet drill is used to expand the hole to form the enlarged head cavity.

[0034] During the process of pulling the jet grouting drill rod out of the anchor hole, when it is necessary to compact the cement soil in the anchoring section, cement slurry can continue to be sprayed in the anchoring section to compact the cement soil in the anchoring section and improve the strength of the cement soil in the anchoring section.

[0035] According to different requirements, the jet grouting drill rod can also be moved back and forth along its axial direction, and multiple reciprocating jet grouting can be carried out in the enlarged head of the variable diameter steel cage to further improve the density of the cement soil in the enlarged head of the variable diameter steel cage. When the jet grouting drill rod moves back and forth, the step surface cannot exceed the upper anchoring part, which will cause the jet grouting drill rod to be unable to return again.

[0036] According to different requirements, in step (2), while the jet-jet drill rod is lifted upward, the cement slurry is continuously sprayed until the step surface reaches the upper side of the upper drill rod hole, and then the cement slurry spraying is suspended to open the vertical reinforcement from the contracted state. Utilizing the process of lifting the jet-jet drill rod upward, the cement slurry is continuously sprayed to perform secondary hole expansion or to compact the cement soil in the expanded head to improve the strength of the expanded head, until the step surface reaches the upper side of the upper drill rod hole, and then the step surface is used to open the vertical reinforcement.

[0037] The steps of the second construction method are as follows:

[0038] (1) Use the jet-jet drill pipe to spray cement slurry and construct the anchor hole;

[0039] (2) Pull out the jet grouting drill pipe, then pass the reduced diameter section of the jet grouting drill pipe through the upper drill pipe hole and the lower drill pipe hole in turn, and make the step surface press against the upper edge of the lower drill pipe hole, and insert the steel structure with the vertical reinforcement in the contracted state into the anchor hole; when the reduced diameter steel cage reaches the set position of the anchor hole, the grouting hole of the jet grouting drill pipe reaches the lower set position of the enlarged head, and then lift the jet grouting drill pipe upward and continue to spray cement slurry until the step surface can press against the upper edge of the upper drill pipe hole, press the step surface against the upper edge of the upper drill pipe hole, push the upper anchoring part downward, and make the vertical reinforcement change from the contracted state to the open state; pull out the jet grouting drill pipe;

[0040] (3) When the cement soil in the anchor hole reaches the set strength, the anchor cables of the anchor cable group are tensioned to generate prestress and anchor; the variable diameter steel cage and the surrounding cement soil together form an enlarged head.

[0041] In this construction method, first, the anchor hole is formed by the rotary grouting method, so that the anchor hole is filled with cement soil formed by a mixture of cement slurry and earthwork. The support of the cement soil is used to avoid the collapse of the inner wall of the anchor hole, thereby avoiding the problem of the variable diameter steel cage being blocked from moving in the anchor hole and unable to reach the set position due to the collapse of the inner wall of the anchor hole in the dry anchor hole or the wet hole drilling with mud wall protection in the prior art.

[0042] This construction method is suitable for soil that does not contain stone-like impurities that cannot be broken and can hinder the movement of the variable-diameter steel cage. The rotary jet drill rod pushes the variable-diameter stirrups to their set positions at one time, and while the rotary jet drill rod is lifted upward, cement slurry is sprayed to expand the hole to form an enlarged head cavity, and the injection of cement slurry into the enlarged head cavity is completed simultaneously.

[0043] In this construction method, it is necessary to set at least two groups of grouting holes spaced apart along the axial direction in the reduced diameter section, so that when the rotary jet drill rod is lifted upward and the step surface reaches the upper side of the upper anchoring part, the grouting holes on the upper side can complete the formation of the upper part of the enlarged head, so that when the upper anchoring part is pushed to open the vertical reinforcement, there is enough space to accommodate the vertical reinforcement, thereby avoiding the vertical reinforcement being unable to be fully opened, affecting the strength of the enlarged head.

[0044] During the process of pulling the jet grouting drill rod out of the anchor hole, when it is necessary to compact the cement soil in the anchoring section, cement slurry can continue to be sprayed in the anchoring section to compact the cement soil in the anchoring section and improve the strength of the cement soil in the anchoring section.

[0045] According to different requirements, the jet grouting drill rod can also be moved back and forth along its axial direction, and multiple reciprocating jet grouting can be carried out in the enlarged head of the variable diameter steel cage to further improve the density of the cement soil in the enlarged head of the variable diameter steel cage. When the jet grouting drill rod moves back and forth, the step surface cannot exceed the upper anchoring part, which will cause the jet grouting drill rod to be unable to return again.

[0046] According to different requirements, in step (2), after the vertical reinforcement reaches the open state, the jet grouting drill rod is lifted upward and cement slurry is continuously sprayed until the upper side of the enlarged head is set. The process of the jet grouting drill rod being lifted upward is used to continue spraying cement slurry to perform secondary hole expansion or to compact the cement soil in the enlarged head to improve the strength of the enlarged head. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural diagram of the anchor cable component carrying the variable diameter steel cage.

[0048] Figure 2 yes Figure 1 Enlarged view of part A.

[0049] Figure 3 yes Figure 2 Magnified view of part B.

[0050] Figure 4 yes Figure 3 Another state diagram of .

[0051] Figure 5 yes Figure 3 Magnified view of part D.

[0052] Figure 6 yes Figure 2 Magnified view of part C.

[0053] Figure 7 yes Figure 6 The view from the EE direction.

[0054] Figure 8 This is the attached picture when the vertical reinforcement is in the contracted state.

[0055] Figure 9 It is a structural diagram of the anchor cable structure. DETAILED DESCRIPTION

[0056] The structure of the anchor cable member 200 carrying the variable diameter steel cage is first described below. In the accompanying drawings, the arrow X indicates the direction of the first axis. Figure 9 The anchor cable member 200 can be inserted into the anchor cable hole 10 formed using the jet grouting process. When the anchor cable member 200 is inserted into the anchor cable hole 10, the first axis is parallel to the central axis of the anchor cable hole. For ease of description, based on the state of the anchor cable member 200 inserted into the anchor cable hole 10, the side facing the anchor cable hole is referred to as the upper side, upper surface, or similar terms, and the direction facing the bottom of the anchor cable hole is referred to as the lower side, lower surface, or similar terms. For clarity, a jet grouting drill rod 60 is inserted into the anchor cable member.

[0057] See also Figures 1-8 The anchor cable assembly 200 includes an anchor cable group and a variable diameter steel cage 20. The variable diameter steel cage 20 includes a lower anchor portion 30, an upper anchor portion 40, and a vertical reinforcement group. The anchor cable group includes four anchor cables 201 that are parallel to each other and extend along the first axis. The two ends of each anchor cable 201 are respectively formed into an anchor end 202 and a tensioning end 203. When the anchor cable assembly is located in the anchor cable hole, the tensioning end 203 extends outward from the anchor cable hole 10, and the anchor end 202 is located at the bottom of the anchor cable hole.

[0058] The upper anchoring part and the lower anchoring part are spaced apart along the first axis direction, and the four anchor cables are spaced apart around the central axis 110. The anchoring end 202 of each anchor cable 201 freely passes through the upper anchoring part 40 and is fixed on the lower anchoring part 30, so that the lower anchoring part is located on the side of the upper anchoring part away from the tensioning end, that is, the upper anchoring part is located on the upper side of the lower anchoring part.

[0059] See also Figure 3 Specifically, in this embodiment, the upper anchoring portion 40 includes an upper pressure plate 41 and an upper hinge ring 46 formed on the side of the upper pressure plate facing the lower anchoring portion. The outer diameter of the upper hinge ring is smaller than the outer diameter of the upper pressure plate. The upper anchoring portion is provided with an upper drill rod hole 411. The upper drill rod hole 411 is a through hole that passes through the upper surface of the upper pressure plate upward and the lower surface of the upper hinge ring downward. Corresponding to each anchor cable 201, a sliding hole 42 in the form of a through hole is provided on the upper pressure plate 41. The upper pressure plate 41 is freely mounted on the anchor cable through the sliding hole, so that the upper anchoring portion is slidably mounted on the anchor cable. In the radial direction, the sliding hole is located on the outside of the upper hinge ring, so that the upper hinge ring does not obstruct the sliding hole.

[0060] See also Figure 6 The lower anchoring portion 30 includes a lower pressure plate 31 and a lower hinge ring 36 formed on the side of the lower pressure plate facing the upper anchoring portion. The outer diameter of the lower hinge ring is smaller than that of the lower pressure plate. A lower drill rod hole 311 is defined in the lower anchoring portion. This lower drill rod hole 311 is a through hole extending upward through the lower surface of the lower pressure plate and the upper surface of the lower hinge ring. The upper drill rod hole and the lower drill rod hole are coaxially arranged in the direction of the first axis.

[0061] The vertical bar assembly includes four vertical bars 21 evenly spaced around the anchor cable assembly. Each vertical bar 21 has an upper hinge bar 47 and a lower hinge bar 37. The ends of the upper hinge bar 47 are hinged to the upper hinge lug 48 and upper hinge ring on the upper portion of the corresponding vertical bar. The ends of the lower hinge bar 37 are hinged to the lower hinge lug 38 and lower hinge ring on the lower portion of the corresponding vertical bar. The upper portion of a vertical bar refers to the end of the bar facing the tensioning end, while the lower portion of a vertical bar refers to the end facing away from the tensioning end.

[0062] When the vertical reinforcement is in the contracted state, the end of the upper hinged reinforcement away from the upper anchorage extends along the inclined direction toward the lower anchorage, and the end of the lower hinged reinforcement away from the lower anchorage extends along the inclined direction toward the upper anchorage. When the vertical reinforcement is in the open state, the side of the upper hinged reinforcement away from the lower anchorage can press against the upper pressure plate, and the side of the lower hinged reinforcement away from the upper anchorage can press against the lower pressure plate. Please also participate Figure 3 and Figure 8 ,in Figure 8 This is the attached figure when the vertical reinforcement is in the contracted state. Figure 3Pushing the upper anchoring portion 40 toward the lower anchoring portion 30 can move the vertical rib from the contracted state to the open state.

[0063] The jet grouting drill rod 60 can deliver the anchor cable component 200 into the anchor cable hole, and after completing the construction of the enlarged head cavity, push the upper anchoring part toward the lower anchoring part, so that the vertical reinforcement reaches the open state from the contracted state.

[0064] The lower end of the rod body 61 of the jet grouting drill rod 60 is radially reduced to form a reduced diameter section 62 and a stepped surface 63 facing the lower end of the jet grouting drill rod. A grouting hole is provided at least at the lower end of the reduced diameter section. The grouting hole is not shown in the accompanying drawings. Figure 6 After the reduced diameter section 62 passes through the upper and lower drill rod holes in sequence, the stepped surface 63 presses against the edge of the lower drill rod hole facing the upper anchor portion, thereby inserting the anchor cable member into the anchor cable hole. Furthermore, after the jet grouting drill rod has completed the construction of the expanded head cavity, it can be lifted toward the outside of the anchor cable hole. After the stepped surface reaches the side of the upper anchor portion facing away from the lower anchor portion, it presses against the edge of the upper drill rod hole facing away from the lower anchor portion, pushing the upper anchor portion toward the lower anchor portion, thereby causing the vertical bar to move from a contracted state to an open state.

[0065] The flexible cable stirrups 22 are wrapped around the vertical reinforcement group. In this embodiment, the flexible cable stirrups are specifically steel wire ropes, which are fixed to the vertical reinforcement group using fasteners. It is understood that in other embodiments, steel wire or galvanized iron wire can also be used to fix the steel wire rope to the vertical reinforcement group. When the vertical reinforcement group is in the open state, the vertical reinforcement group can fully expand the flexible cable stirrups, making the flexible cable stirrups taut. When the vertical reinforcement group is in the contracted state, the flexible cable stirrups can bend and be accommodated inwardly within the space enclosed by the vertical reinforcement group.

[0066] After the jet grouting drill rod sends the anchor cable component into the anchor cable hole, cement will be sprayed to expand the anchor cable hole to form an enlarged head cavity, and the variable diameter steel cage will be located in the enlarged head cavity. The jet grouting drill rod is then lifted upward, and the step surface is pressed against the edge of the upper drill rod hole away from the lower anchoring part, pushing the upper anchoring part toward the lower anchoring part, so that the vertical reinforcement moves from a contracted state to an open state.

[0067] In order to smoothly use the jet grouting drill rod to open the vertical reinforcement, in this embodiment, an elastic positioning mechanism is fixedly installed on the side of the upper pressure plate 41 of the upper anchoring part 40 away from the lower anchoring part 30. In this embodiment, the elastic positioning mechanism includes three elastic positioners 50, which are evenly spaced around the upper drill rod hole 411. Please also refer to Figure 5Each elastic positioner 50 includes a housing 51, a positioning rod 53, and an elastic member 54. The housing has a radially extending guide cavity 52 with an opening toward the central axis. The elastic member is disposed within the guide cavity. The positioning rod is slidably inserted into the guide cavity through the opening. Under the action of an external force, the positioning rod can compress the elastic member. When the external force is removed, the positioning rod can move toward the central axis under the push of the elastic member. The radial direction mentioned above refers to the direction perpendicular to and passing through the central axis.

[0068] When the stepped surface of the rotary jet drill rod presses against the lower anchor part, the positioning rod presses against the rotary jet drill rod and compresses the elastic part; when the rotary jet drill rod is lifted toward the outside of the anchor hole and the stepped surface reaches the side of the positioning rod away from the upper anchor part, the elastic part can push the positioning rod outward, so that the positioning rod presses against the reduced diameter section, thereby enabling the stepped surface to press against the side of the positioning rod away from the upper anchor part, and pushing the upper anchor part toward the lower anchor part, so that the vertical reinforcement reaches the open state from the contracted state.

[0069] In this embodiment, the elastic member is specifically a cylindrical helical compression spring. It is understood that in other embodiments, the elastic member may also be a rubber block or elastic sheet. To prevent cement slurry from entering the guide cavity, an O-shaped rubber ring is embedded in the inner wall of the guide cavity 52 at the outlet. The O-shaped rubber ring is not shown in the drawings.

[0070] The elastic positioning mechanism is designed to enable the step surface to smoothly press the positioning rod against the edge of the upper drill rod hole. When the step surface can smoothly press against the edge of the upper drill rod hole, the elastic positioning mechanism can be eliminated. For example, when the anchor cable member is inclined and the jet-jet drill rod bends due to gravity in this inclined state, the elastic positioning mechanism can be eliminated. However, when the step surface cannot be ensured to press against the edge of the upper anchor hole, it is best to retain the elastic positioning mechanism.

[0071] To facilitate securing the anchor cable to the lower anchoring portion, in this embodiment, a through-hole anchoring hole is provided on the lower pressure plate 31 corresponding to each anchor cable 201. The end of the anchoring hole facing away from the upper anchoring portion is formed into a conical hole 312 with the smaller end facing the upper anchoring portion. A clip assembly 32 is disposed within this conical hole. A compression plate 34 is provided on the side of the lower pressure plate facing away from the upper anchoring portion. A locking bolt 35 passes through the lower pressure plate 31 and is screwed onto the compression plate 34, connecting the compression plate to the lower pressure plate. The compression plate tightly squeezes the clips in the clip assembly into the conical hole, securing the anchor cable to the lower pressure plate via the clips. A through-hole rod hole 341 is provided on the compression plate 34, through which the reduced diameter section of the jet-jet drill pipe 60 can pass downward. Radially, the anchoring hole is located outside the lower hinge ring, preventing the lower hinge ring from obstructing the anchoring hole.

[0072] To ensure that the clips can be squeezed to the desired strength and to prevent the clips from being completely contained within the conical hole and losing their ability to secure the anchor cable, a squeezing tube 33, sleeved over the anchor cable, is located between the clamping plate and the clip assembly. The clamping plate tightly presses the squeezing tube 33 against the clips. The end of the squeezing tube facing the clips only presses against the end face of the clips.

[0073] To ensure the variable-diameter steel cage is completely encased in cement slurry, when the stepped surface presses against the upper edge of the lower drill rod hole, the spray holes at the lowest end of the jet-jet drill rod extend downward beyond the lower end surface of the vertical reinforcement when in the open position. It will be appreciated that in other embodiments, at least two groups of spray holes may be radially disposed along the reduced-diameter section, with one group located at the lower end of the reduced-diameter section.

[0074] In order to explain the anchor cable component more clearly, the anchor cable structure formed by the anchor cable component in this embodiment is described below. Figure 9 Along the length direction, the anchor cable structure includes an enlarged head section, a common anchoring section and a free section connected in sequence, wherein the enlarged head section and the common anchoring section are collectively referred to as the anchoring section, and the diameters of the common anchoring section and the free section are roughly the same. Figure 9 In FIG, the region of the enlarged head section is marked as S, the region of the common anchoring section is marked as M, and the region of the free section is marked as N. The enlarged head section is formed by the enlarged head portion 12 described below.

[0075] The anchor cable structure includes an anchor cable component 200 inserted into the anchor cable hole 10 and cement soil wrapped on the anchor cable component. The anchor cable hole is formed by a rotary grouting process. To simplify the drawings, the cement soil is not shown in the drawings. The anchor cable hole 10 includes a rod section 11 and an enlarged head 12 located at the lower end of the rod section 11. The cavity formed by the outer peripheral surface of the enlarged head is the enlarged head cavity. The enlarged head cavity in this application is slightly different from the enlarged head cavity in the prior art. In this application, the enlarged head cavity is formed while the cement slurry in the enlarged head cavity is completed, and the cement slurry is mixed with the earth to form cement soil. In the prior art, the enlarged head cavity is formed first, and then the enlarged head steel cage is placed into the enlarged head cavity, and finally cement slurry is injected into the enlarged head cavity or concrete is poured. The variable diameter steel cage rotary grouting anchor cable structure in this embodiment is inclined, with an angle of 45° to the horizontal plane. It is understood that in other embodiments, according to different requirements, the inclination angle can also be 30°, 40°, or 60°. Of course, it can also be vertical or horizontal, or other angles between 0-90°. Because this anchor cable structure is constructed in conjunction with the rotary grouting process, it is also called a variable diameter steel cage rotary grouting anchor cable structure.

[0076] In order to provide a more detailed description of the anchor cable component in this application, the following describes the construction method of the variable diameter steel cage rotary spray anchor cable structure, which specifically includes two construction methods, which are described as follows:

[0077] The first construction method, the steps are as follows:

[0078] (1) Use the jet-jet drill pipe to spray cement slurry and construct the anchor hole;

[0079] (2) Pull out the jet grouting drill pipe, then pass the reduced diameter section of the jet grouting drill pipe through the upper drill pipe hole and the lower drill pipe hole in turn, and make the step surface press against the upper edge of the lower drill pipe hole, and insert the anchor cable component with the vertical reinforcement in the contracted state into the anchor cable hole; when the variable diameter steel cage reaches the set position of the anchor cable hole, the grouting hole of the jet grouting drill pipe reaches the upper set position of the enlarged head, and then continue to spray cement slurry to expand the anchor cable hole, and at the same time continue to push the anchor cable component downward until the grouting hole reaches the lower set position of the enlarged head, and when the enlarged head cavity is formed, the grouting in the enlarged head cavity is completed at the same time.

[0080] Lift the jet grouting drill rod upward. When the step surface reaches the upper side of the upper drill rod hole, press the step surface against the upper edge of the upper drill rod hole. Then push the upper anchor part downward to make the vertical reinforcement move from the contracted state to the open state, and pull out the jet grouting drill rod.

[0081] In order to compact the cement soil in the expansion head cavity and ensure its strength, in another embodiment, when the rotary jet drill rod is lifted upward, the cement slurry can continue to be sprayed until the step surface reaches the upper side of the upper drill rod hole, and then the cement slurry spraying is stopped to move the vertical reinforcement from the contracted state to the open state.

[0082] If necessary, cement slurry can be continuously sprayed on the anchoring section while the jet-jet drill rod is being pulled out, so as to improve the bonding strength of the anchoring section.

[0083] (3) When the cement soil in the anchor hole reaches the set strength, the anchor cables of the anchor cable group are tensioned to generate prestress and anchor; the variable diameter steel cage and the surrounding cement soil together form an enlarged head.

[0084] It can be understood that according to different requirements, in other embodiments, after the variable diameter steel cage is sent to its set position, the rotary jet drill rod can also be moved back and forth along its axial direction, and multiple reciprocating rotary jets can be performed in the enlarged head of the variable diameter steel cage to further improve the density of the cement soil in the enlarged head of the variable diameter steel cage. When the rotary jet drill rod moves back and forth, the step surface cannot exceed the upper anchoring part, resulting in the rotary jet drill rod being unable to return again.

[0085] The second construction method, the steps are as follows:

[0086] (1) Use the jet-jet drill pipe to spray cement slurry and construct the anchor hole;

[0087] (2) Pull out the jet grouting drill pipe, then pass the reduced diameter section of the jet grouting drill pipe through the upper drill pipe hole and the lower drill pipe hole in turn, and make the step surface press against the upper edge of the lower drill pipe hole, and insert the anchor cable component with the vertical reinforcement in the contracted state into the anchor cable hole; when the variable diameter steel bar cage reaches the set position of the anchor cable hole, the grouting hole of the jet grouting drill pipe reaches the lower set position of the enlarged head, and then lift the jet grouting drill pipe upward and continue to spray cement slurry until the step surface can press against the upper edge of the upper drill pipe hole, press the step surface against the upper edge of the upper drill pipe hole, and push the upper anchoring part downward to make the vertical reinforcement change from the contracted state to the open state.

[0088] After the vertical reinforcement reaches the open state, lift the jet grouting drill pipe upward and continue to spray cement slurry until it reaches the upper set position of the expanded head. Then withdraw the jet grouting drill pipe.

[0089] If necessary, cement slurry can be continuously sprayed on the anchoring section while the jet-jet drill rod is being pulled out, so as to improve the bonding strength of the anchoring section.

[0090] (3) When the cement soil in the anchor hole reaches the set strength, the anchor cables of the anchor cable group are tensioned to generate prestress and anchor; the variable diameter steel cage and the surrounding cement soil together form an enlarged head.

[0091] In this embodiment, two groups of grouting holes are arranged at intervals along the axial direction on the jet grouting drill rod. When the step surface is located on the upper side of the upper anchoring part, the grouting holes located on the upper side can complete the formation of the upper part of the enlarged head cavity, so that when the vertical ribs are opened, the vertical ribs can reach the open state, thereby ensuring the strength of the enlarged head.

[0092] It can be understood that according to different requirements, in other embodiments, after the variable diameter steel cage is sent to its set position, the rotary jet drill rod can also be moved back and forth along its axial direction, and multiple reciprocating rotary jets can be performed in the enlarged head of the variable diameter steel cage to further improve the density of the cement soil in the enlarged head of the variable diameter steel cage. When the rotary jet drill rod moves back and forth, the step surface cannot exceed the upper anchoring part, resulting in the rotary jet drill rod being unable to return again.

Claims

1. An anchor cable component carrying a variable diameter steel cage, characterized in that: The anchor cable component can be inserted into an anchor cable hole formed by a rotary grouting process; the anchor cable component includes an anchor cable group and a variable diameter steel cage connected to the anchor cable group, the variable diameter steel cage includes a lower anchoring portion, an upper anchoring portion and a vertical reinforcement group, the anchor cable group includes 2-10 anchor cables that are parallel to each other and extend along the first axis, and the two ends of each anchor cable are respectively formed as an anchor end and a tensioning end; The upper anchoring portion and the lower anchoring portion are spaced apart along the first axis direction, and the 2-10 anchor cables are spaced apart around a central axis, and the anchoring end of each anchor cable freely passes through the upper anchoring portion and is fixed to the lower anchoring portion, so that the lower anchoring portion is located on the side of the upper anchoring portion away from the tensioning end; The vertical reinforcement group includes a plurality of vertical reinforcements spaced around the anchor cable group. Each vertical reinforcement has an upper hinged reinforcement and a lower hinged reinforcement. The two ends of the upper hinged reinforcement are respectively hinged to the end of the corresponding vertical reinforcement facing the tensioning end and the upper anchoring portion. The two ends of the lower hinged reinforcement are respectively hinged to the end of the corresponding vertical reinforcement facing away from the tensioning end and the lower anchoring portion. The soft rope stirrups are wrapped around the vertical reinforcement group. An upper drill rod hole is provided on the upper anchoring portion, and a lower drill rod hole is provided on the lower anchoring portion, wherein the upper drill rod hole and the lower drill rod hole are coaxially arranged in the direction of the first axis; pushing the upper anchoring portion toward the lower anchoring portion can cause the vertical reinforcement to move from a contracted state to an open state; The jet-jet drill pipe can deliver the anchor cable component into the anchor cable hole, and after completing the construction of the enlarged head cavity, it pushes the upper anchoring part toward the lower anchoring part, so that the vertical reinforcement moves from the contracted state to the open state; The lower end of the rod body of the rotary jet drill rod is radially reduced to form a reduced diameter section and a step surface facing the lower end face of the rotary jet drill rod, and a grouting hole is provided at least at the lower end of the reduced diameter section; the reduced diameter section can pass through the upper drill rod hole and the lower drill rod hole in sequence, so that the step surface is pressed against the edge of the lower drill rod hole facing the upper anchoring part, and the anchor cable component is sent into the anchor cable hole; and the rotary jet drill rod can be lifted toward the outside of the anchor cable hole after completing the construction of the expanded head cavity, and after the step surface reaches the side of the upper anchoring part away from the lower anchoring part, the step surface is pressed against the edge of the upper drill rod hole away from the lower anchoring part, and the upper anchoring part is pushed toward the lower anchoring part, so that the vertical reinforcement is changed from a contracted state to an open state.

2. The anchor cable member according to claim 1, characterized in that: The upper anchoring portion includes an upper pressure plate and an upper hinge ring formed on the side of the upper pressure plate facing the lower anchoring portion, the outer diameter of the upper hinge ring is smaller than the outer diameter of the upper pressure plate, and the upper hinge rib is hinged on the upper hinge ring; The lower anchoring portion includes a lower pressure plate and a lower hinge ring formed on the side of the lower pressure plate facing the upper anchoring portion, the outer diameter of the lower hinge ring is smaller than the outer diameter of the lower pressure plate, and the lower hinge rib is hinged on the lower hinge ring; When the vertical reinforcement is in a contracted state, one end of the upper hinge reinforcement away from the upper anchor portion extends along an inclined direction toward the lower anchor portion, and one end of the lower hinge reinforcement away from the lower anchor portion extends along an inclined direction toward the upper anchor portion; When the vertical reinforcement is in the open state, the side of the upper hinge reinforcement away from the lower anchoring portion can be pressed against the upper pressure plate, and the side of the lower hinge reinforcement away from the upper anchoring portion can be pressed against the lower pressure plate.

3. The anchor cable member according to claim 1, characterized in that The lower anchoring part includes a lower pressure plate. Corresponding to each anchor cable, an anchor hole in the form of a through hole is provided on the lower pressure plate. The end of the anchor hole facing away from the upper anchoring part is formed into a conical hole with the small end facing the upper anchoring part. A clip group is arranged in the conical hole. An extrusion plate is provided on the side of the lower pressure plate facing away from the upper anchoring part. The locking bolt connects the extrusion plate to the lower pressure plate, and the extrusion plate tightly squeezes the clips in the clip group into the conical hole, so that the anchor cable is fixed to the lower pressure plate through the clip group.

4. The anchor cable member according to claim 3, characterized in that: Corresponding to each anchor cable, there is a set of extrusion tubes arranged on the anchor cable between the compression plate and the clamping piece group. The compression plate presses the extrusion tube tightly on the clamping piece, and the end of the compression tube facing the clamping piece only presses on the end surface of the clamping piece.

5. The anchor cable member according to claim 1, characterized in that: An elastic positioning mechanism is fixedly installed on the side of the upper anchoring portion facing away from the lower anchoring portion, the elastic positioning mechanism includes at least one elastic positioner, each elastic positioner includes a shell, a positioning rod and an elastic member, the shell has a guide cavity extending in the radial direction, the guide cavity has an opening facing the central axis, the elastic member is arranged in the guide cavity, the positioning rod is slidably inserted into the guide cavity through the opening of the guide cavity, under the action of an external force, the positioning rod can compress the elastic member, when the external force is removed, the positioning rod can move toward the central axis under the push of the elastic member; When the stepped surface of the rotary jet drill rod presses against the lower anchor part, the positioning rod presses against the rotary jet drill rod and compresses the elastic part; when the rotary jet drill rod is lifted toward the outside of the anchor hole and the stepped surface reaches the side of the positioning rod away from the upper anchor part, the elastic part can push the positioning rod outward, so that the positioning rod presses against the reduced diameter section, thereby enabling the stepped surface to press against the side of the positioning rod away from the upper anchor part, and pushing the upper anchor part toward the lower anchor part, so that the vertical reinforcement reaches the open state from the contracted state.

6. The anchor cable member according to claim 1, characterized in that: When the step surface presses against the edge of the lower drill rod hole toward the upper anchoring part, in the direction from the tensioning end to the anchoring end, the grouting hole at the lowest end of the jet grouting drill rod can exceed the end face of the vertical reinforcement away from the tensioning end when in the open state.

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