An inner and outer mold segmented CFRP rod cable composite type anchoring system and assembly method

Abstract

This invention discloses a composite anchoring system and assembly method for CFRP cables with internal and external mold segments. The system includes an outer mold sleeve, an inner conical sleeve, fixing components, and a plug. One end of the outer mold sleeve is closed, and the other end is open and fitted with a plug. The inner conical sleeve is assembled from several inner conical segments and anchored within the outer mold sleeve. Adhesive is injected into the large-diameter end of the inner conical sleeve, and after solidification, the CFRP cable is directly fixed by adhesive force. The fixing components are distributed among the inner conical segments. When the CFRP cable passes through one end of the outer mold sleeve and the inner conical sleeve reaches the other end, the fixing components mechanically anchor the CFRP cable before bonding. The internal mold sleeve in this design has a modular structure, which allows for varying anchoring lengths by assembling different numbers of inner conical sleeves. This achieves anchoring of CFRP cables of different strengths while reducing the outer diameter of each inner conical segment, saving space occupied by the anchoring section.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of civil engineering, in particular to an inner-outer mold segmented CFRP rod cable composite anchoring system and an assembling method thereof. BACKGROUND

[0002] At present, the CFRP cable is mostly used with a sleeve glue pouring type anchor, which is composed of a sleeve pipe or a sleeve, and a plug, and a glue material such as resin and expanded cement mortar is poured between the cable and the sleeve. The sleeve glue pouring type anchor is mature in technology, has wide application range and low cost; however, the length of the anchor sleeve is large, which leads to a large outer diameter of the sleeve, and the glue pouring from the end is easy to form a cavity inside the sleeve pipe, resulting in poor bonding force. If the CFRP cable is not accurately centered, the cable axis does not coincide with the sleeve axis, and the cable material is eccentrically tensioned, which leads to early fracture of the cable material. During the maintenance process after glue pouring, gaps often occur between the cable and the glue due to disturbance, which reduces the bonding force.

[0003] In the Chinese patent with the publication number "CN 113737787", an extrusion-bonding type anchoring system and anchoring method for an FRP rod body are disclosed. The extrusion-bonding type anchoring system for the FRP rod body includes two clamps, an anchoring steel pipe, and epoxy resin. The two clamps are oppositely arranged and cooperatively fitted in the anchoring steel pipe. The two clamps are in a sealed integrated state after the end portions of the two clamps are butted. The FRP rod body is coaxially fitted in a circular sleeve structure formed by the two clamps. The clamps and the FRP rod body are filled with epoxy resin. The centering ring is coaxially sleeved on the FRP rod body and embedded in a circular sleeve structure formed by the other end portions of the two clamps. The use of the extrusion-bonding type composite anchor effectively improves the anchoring efficiency of the anchoring system, prevents the debonding between the FRP rod body and the epoxy resin, reduces the stress concentration at the end portion of the anchoring system, and improves the fatigue resistance of the anchoring system.

[0004] However, the two clamps in the existing extrusion-bonding type anchoring system for the FRP rod body are in an integrated structure after being connected, which cannot be adjusted in segments. When a cable with different length or a sleeve glue pouring type anchor is needed, the outer sleeve and the clamps need to be replaced as a whole to adapt to the length, which is complicated in structure and high in cost. Therefore, there is an urgent need for a sleeve glue pouring type anchor with high practicality to adapt to cables with various lengths. SUMMARY

[0005] In view of the technical problem of the low practicality of the existing sleeve glue pouring type anchor, the purpose of the present application is to provide an inner-outer mold segmented CFRP rod cable composite anchoring system which can adapt to cables with various lengths. On this basis, an assembling method of the inner-outer mold segmented CFRP rod cable composite anchoring system is also provided, which effectively overcomes the problems existing in the prior art.

[0006] In order to achieve the above object, the application provides an inner and outer mold segmented CFRP rod cable composite type anchoring system, which comprises an outer mold sleeve, an inner conical sleeve, a fixing assembly and a plug, one end of the outer mold sleeve is a closed end, the other end is an open end and is matched with the plug, the inner conical sleeve is assembled by a plurality of inner conical segments and is anchored in the outer mold sleeve, the small diameter end of the whole structure directly abuts against the closed end of the outer mold sleeve, the adhesive is injected into the large diameter end of the inner conical sleeve, the space in the inner conical sleeve is filled with the adhesive, and the CFRP cable is directly fixed by the adhesive bonding force after setting, the fixing assembly is distributed in the plurality of inner conical segments, when the CFRP cable penetrates through one end of the outer mold sleeve and the inner conical sleeve reaches the other end of the outer mold sleeve, the CFRP cable is mechanically anchored by the fixing assembly before bonding.

[0007] Further, a plurality of glue injection holes are distributed on the outer mold sleeve, the outer mold sleeve is bonded with the inner conical sleeve by injecting glue into the outer mold sleeve through the glue injection holes.

[0008] Further, the inner thread structure is arranged in the large diameter end of the inner conical segment, the outer thread structure is arranged on the small diameter end of the inner conical segment, the adjacent inner conical segments are modularly assembled by penetrating the small diameter end of the inner conical segment into the large diameter end of the adjacent inner conical segment and being connected by the thread.

[0009] Further, the fixing assembly mounting holes are arranged on both sides of the inner conical segment, the fixing assembly is arranged in the fixing assembly mounting hole to preliminarily connect and fix the inner conical segments.

[0010] Further, the fixing assembly comprises two fixing plates, one side of the fixing plate is an inclined curved surface, and the other side is a semicircular groove, the two fixing plates are inserted from both sides of the inner conical segment, the semicircular grooves on the two fixing plates are butt-jointed and assembled into a circular groove in the inner conical segment, the diameter of the circular groove is the same as that of the CFRP cable, and the circular groove preliminarily determines the axis of the CFRP cable.

[0011] Further, the fixing assembly is fixed in the fixing mounting hole by the thermal expansion and cold shrink process, and has a squeezing effect on the CFRP cable.

[0012] In order to achieve the above object, the application provides an assembly method of the inner and outer mold segmented CFRP rod cable composite type anchoring system, which is matched with the inner and outer mold segmented CFRP rod cable composite type anchoring system, and the assembly method comprises the following steps:

[0013] First, according to the need of anchoring CFRP cable diameter to determine the anchoring length and then determine the number of inner conical segments, a number of inner conical segments are connected end to end to assemble and combine into a conical cylinder stacking system, the fixed nail 3 is inserted into a plurality of inner mold nail holes on the inner conical sleeve, and the CFRP cable is sequentially threaded through each pair of fixed nail formed circular groove from one end of the conical cylinder head and tail stacking system;

[0014] After the CFRP cable is threaded out of the other end of the conical cylinder head and tail stacking system, the fixed nail is extruded on the CFRP cable through the heat expansion and cold shrink process, so that the CFRP cable is in a mechanical anchoring state;

[0015] The radial size of the fixed nail is reduced by cooling treatment to ensure that the inner conical sleeve system connected by the slightly larger fixed nail can be smoothly inserted into the outer mold sleeve. After the cooling treatment, the system is slowly inserted into the outer mold sleeve, the CFRP cable is threaded out of the center hole at one end of the outer mold sleeve, and the small diameter end of the inner conical sleeve head and tail stacking system is abutted against the closed end of the center hole of the outer mold sleeve. The system connected with the outer mold sleeve is placed in normal temperature, and the temperature of the fixed nail can be restored by natural or artificial heating means, and the radial size of the fixed nail increases slightly. The extrusion effect is generated between the fixed nail and the outer mold sleeve, the extrusion force is transmitted to the CFRP cable through the fixed nail, and the CFRP cable is in a mechanical anchoring state;

[0016] The adhesive is injected into the inner conical sleeve and the space between the outer mold sleeve and the inner conical sleeve through the large diameter end of the conical cylinder head and tail stacking system and the outer mold glue injection hole respectively, the plug is threaded on the outer mold sleeve through the CFRP cable, and the anchoring system is completed after the adhesive is solidified and formed.

[0017] The inner and outer mold segment type CFRP rod cable composite anchoring system and assembly method provided by the application has the advantages that the inner mold sleeve is a modular structure, the anchoring length can be changed by assembling different numbers of inner conical sleeves, different strength CFRP cables can be anchored, the outer diameter of each inner conical segment is reduced, and the space occupied by the anchoring segment is saved.

[0018] Meanwhile, the inner mold sleeve in the scheme is a conical structure, the adhesive is solidified in the inner conical sleeve to form a conical shape, and the anchoring effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described below in combination with the drawings and specific embodiments.

[0020] Figure 1 It is a sectional view of the overall structure of the inner and outer mold segment type CFRP rod composite anchoring system;

[0021] Figure 2 It is an assembly drawing of the outer mold sleeve in the inner and outer mold segment type CFRP cable composite anchoring system;

[0022] Figure 3 This is a structural detail drawing of the outer mold sleeve in the segmented CFRP rod composite anchoring system with internal and external molds;

[0023] Figure 4 This is the assembly drawing of the inner conical sleeve in this segmental CFRP cable composite anchoring system with internal and external molds;

[0024] Figure 5 This is a structural detail drawing of the inner conical sleeve in this segmental CFRP cable composite anchoring system with internal and external molds;

[0025] Figure 6 This is a schematic diagram of the fixing clips in the internal and external mold segmented CFRP cable composite anchoring system.

[0026] The following are the component labels in the attached diagram:

[0027] 1. Outer mold sleeve 11. First central circular hole 12. Injection hole 13. Closed end 2. Inner conical sleeve 21. Inner conical segment 3. Fixing component / fixing clip 31. Inclined curved surface 32. Semi-circular groove 33. Fixing plate 4. Plug 5. CFRP cable 6. Inner mold clip hole Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0029] See Figure 1 The CFRP rod and cable composite anchoring system with inner and outer mold segments provided in this solution includes an outer mold sleeve 1, an inner conical sleeve 2, and a fixing component 3.

[0030] Among them, see Figures 1-2 The outer mold sleeve 1 is a circular cylinder with an internal cavity for housing the inner conical sleeve 2.

[0031] The first end of the outer mold sleeve 1 is a closed end with a first central circular hole 11, and the other end is an open end. The CFRP cable 5 can pass through the outer mold sleeve 1 through the first central circular hole 11 and the open end.

[0032] The outer mold sleeve 1 is also provided with several injection holes 12 for injecting glue into the outer mold sleeve 1 through the injection holes 12, and for bonding the inner conical sleeve 2 and the outer mold sleeve 1 together.

[0033] Here, the injection hole 12 can be used as a vent hole to minimize the presence of too many pores inside the adhesive, which would affect the anchoring quality and ensure that the conical space inside the segment is filled with dense adhesive material. In addition, the injection hole 12 can also be used as an inspection hole to observe whether the space is filled with dense adhesive material.

[0034] See Figures 3-4 The inner conical sleeve 2 includes several inner conical segments 21. After assembling the several inner conical segments 21, they are anchored in the outer mold sleeve 1. The small diameter end of the overall structure directly abuts against the closed end of the outer mold sleeve 1. The closed end of the outer mold sleeve 1 restricts the displacement of the inner conical sleeve 2, which plays a role in mechanical abutment and limiting.

[0035] The large-diameter end of the inner conical segment 21 has an internal thread structure, and the small-diameter end has an external thread structure. Adjacent inner conical segments 21 are modularly assembled by passing the small-diameter end of the inner conical segment 21 through the large-diameter end of the adjacent inner conical segment 21 and connecting them with threads.

[0036] The existing internal clips are connected as a single unit, while the inner conical sleeve 2 in this solution is modularly assembled. It can change the anchorage length by assembling different numbers of inner conical segments 21 to achieve anchorage of CFRP cables 5 with different strengths. At the same time, the outer diameter of each inner conical segment 21 is reduced, making the anchorage system smaller and lighter, saving the space occupied by the anchorage segment, and also reducing production costs.

[0037] Each inner conical segment 21 has a central hole. After being assembled and placed in the outer mold sleeve 1, the central hole on it and the first central circular hole 11 on the outer mold sleeve 1 are on the same axis, allowing the CFRP cable 5 to pass through the inner conical sleeve 2 to reach both ends of the outer mold sleeve 1.

[0038] Then, adhesive is injected into the inner conical sleeve 2 at the large diameter end. The adhesive fills the space inside the inner conical sleeve 2 and solidifies. After solidification, the CFRP cable 5 is directly fixed by the adhesive force.

[0039] In this design, the inner conical sleeve 2 is preferably conical. The adhesive solidifies inside the inner conical sleeve 2 to form a cone shape, which further improves the anchoring effect. At the same time, the inner surface of the inner conical sleeve 2 is an internally threaded surface, which can increase the interfacial bonding load-bearing capacity between the inner conical sleeve 2 and the solidified adhesive.

[0040] Furthermore, a plug 4 can be installed at the open end of the outer mold sleeve 1. The plug serves to fix the axis of the CFRP cable 5 on the one hand, and on the other hand, its cooperation with the closed end of the outer mold sleeve 1 can prevent the adhesive injected into the inner conical sleeve from flowing out.

[0041] Meanwhile, the plug 4 is provided with a second central circular hole and the first central circular hole 11 at the closed end, which can also serve as a vent hole. This can minimize the presence of too many pores inside the adhesive, which would affect the anchoring quality and ensure that the conical space inside the segment is filled with dense adhesive material.

[0042] Before injecting adhesive into the inner mold sleeve 2, fixing components 3 are respectively installed inside each inner conical segment 21 of the inner mold sleeve 2. The fixing components 3 can connect the inner conical sleeve 2, serving as connecting components, and can also pre-fix the CFRP cable 5 to ensure that the cable axis is consistent with the axis of the inner conical segment, so that the cable is evenly stressed and the effect of eccentricity is reduced.

[0043] In this scheme, the fixing component 3 preferably adopts fixing clips 3, which are distributed at the small diameter end of the inner conical segment 21. Correspondingly, inner mold clip holes 6 are provided on both sides of the inner conical segment 21, which are adapted to the size of the fixing clips 3 for installing the fixing clips 3.

[0044] In this design, multiple fixing clips 3 are preferably distributed at equal intervals in the inner conical sleeve 2. This arrangement ensures that the mechanical anchoring section is distributed throughout the entire anchoring system, sharing the load and resisting external loads. This avoids the mechanical anchoring section from being easily damaged due to bearing large external loads, and the load is more evenly distributed on the CFRP cable 5, avoiding stress concentration.

[0045] Furthermore, in this solution, the fixing pin 3 includes two fixing plates 33. One side of each fixing plate 33 is an inclined curved surface 31, and the other side is a semi-circular groove 32. After the two fixing plates 33 are inserted from both sides of the inner conical segment 21, the semi-circular grooves 32 on the two fixing plates are joined together inside the inner conical segment to form a circular groove. The diameter of the circular groove is the same as that of the CFRP cable 5. Together, they preliminarily determine the axis of the CFRP cable 5, which can ensure that the CFRP cable 5 is straight and in the center position before and after the adhesive is injected, thus reducing the influence of eccentricity.

[0046] At the same time, the circular hole formed by the docking is matched with the first central circular hole 11 at the closed end of the outer mold sleeve 1 and the second central circular hole on the plug 4, which reduces the distance between each support point and avoids the bending phenomenon caused by the excessive spacing between support points when the anchoring section is too long. It can also be squeezed with the outer mold sleeve 1 to achieve the effect of mechanical anchoring, resulting in higher construction efficiency.

[0047] The inclined curved surface 31 fits the shape of the inner surface of the outer mold sleeve 1 at the corresponding position, but its radial dimension is slightly larger than that of the inner mold pin hole 6, which makes it easy to insert the fixing pin 3 into the inner mold pin hole 6. Placing the fixing pin 3 in the inner mold pin hole 6 can play the role of initially connecting and fixing each inner conical sleeve 2.

[0048] After inserting the fixing plate 33 into the inner mold clip holes 6 on both sides of the inner conical segment 21, this solution preferably uses a thermal expansion and contraction fixing process to fix it in the inner mold clip holes 6. Specifically, the fixing clips made of steel are cooled to achieve cold contraction, ensuring that the slightly larger inner conical sleeve system can be smoothly inserted into the outer mold sleeve 1. After insertion, the size of the fixing clip 3 is reduced by natural or artificial heating, and the volume of the fixing clip 3 will increase. The two sides will respectively compress the outer mold sleeve 1 and the CFRP cable 5, thereby achieving the compression effect between the outer mold sleeve 1, the fixing clip 3, and the CFRP cable 5, ensuring that the CFRP cable 5 is fully anchored by mechanical anchoring before glue injection.

[0049] Here, due to the fixation of the plug 4 and the fixing clip 3, the disturbance during the curing process after the glue is applied will not cause gaps between the cable and the adhesive, thus ensuring the bonding strength of the cable-adhesive interface and improving the reliability of the anchoring system.

[0050] This invention combines the advantages of mechanical anchoring and adhesive anchoring. Before applying adhesive, the CFRP cable 5 is fixed in place by mechanical anchoring using fixing clips 3. Then, adhesive is injected to bond and anchor the remaining CFRP cable 5 positions that have not been mechanically anchored. After the adhesive solidifies, it works in conjunction with the mechanical anchoring positions, thus functioning as a composite anchor. Under external loads, both anchoring methods work together on the CFRP cable 5. Even if one anchoring method fails, the other can still function, providing a certain safety margin and higher reliability.

[0051] Based on the aforementioned segmental CFRP rod-cable composite anchoring system with internal and external molds, this solution also provides an assembly method for the segmental CFRP rod-cable composite anchoring system with internal and external molds. The specific assembly method includes the following steps:

[0052] First, determine the anchoring length based on the diameter of the CFRP cable 5 to be anchored, and then determine the number of inner conical segments 21. Connect several inner conical segments 21 end to end to assemble them into a conical stacking system. Insert the fixing pins 3 into several inner mold pin holes 6 on the inner conical sleeve 2 until the inclined curved surface of the fixing pins 3 slightly protrudes from the outer surface of the inner conical sleeve 2 at the corresponding position. Pass the CFRP cable 5 through the circular groove formed by each pair of fixing pins 3 from one end of the conical stacking system.

[0053] After the CFRP cable 5 passes through the other end of the stacked conical sleeve system, the system is cooled with liquid nitrogen to reduce the radial dimension of the fixing pin 3. This ensures that the inner conical sleeve 2 system, connected by the slightly larger fixing pin 3, can be smoothly inserted into the outer mold sleeve 1. After cooling, the system is slowly inserted into the outer mold sleeve 1. The CFRP cable 5 passes through the central hole at one end of the outer mold sleeve 1 until the smaller diameter end of the stacked inner conical sleeve 2 system is tightly abutted against the closed end of the first central hole 11 of the outer mold sleeve. The system connected to the outer mold sleeve 1 is then placed at room temperature. The temperature of the fixing pin 3 can be restored through natural or artificial heating, resulting in a slight increase in its radial dimension. The fixing pin 3 and the outer mold sleeve 1 generate a compression effect, and the compression force is transmitted to the CFRP cable 5 through the fixing pin 3, putting the CFRP cable 5 in a mechanically anchored state.

[0054] Adhesive is injected into the inner conical sleeve 2 and the space between the outer mold sleeve 1 and the inner conical sleeve 2 through the large-diameter end of the conical sleeve stacking system and the outer mold injection hole 7, respectively. The plug 4 is then passed through the CFRP cable 5 and secured to the outer mold sleeve 1. After the adhesive has solidified, the anchoring system is completed.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A segmental CFRP rod-cable composite anchoring system with internal and external molds, characterized in that, The system includes an outer mold sleeve, an inner conical sleeve, fixing components, and a plug. One end of the outer mold sleeve is closed, and the other end is open and fitted with a plug. The inner conical sleeve is assembled from several inner conical segments and anchored within the outer mold sleeve. The smaller diameter end of the inner conical sleeve directly abuts against the closed end of the outer mold sleeve. Adhesive is injected into the larger diameter end of the inner conical sleeve, filling the space within. After solidification, the adhesive force directly fixes the CFRP cable. The fixing components are distributed among the inner conical segments. When the CFRP cable passes through one end of the outer mold sleeve and the inner conical sleeve reaches the other end, the fixing components mechanically anchor the CFRP cable before bonding. The outer mold sleeve has several injection holes. Glue is injected into the outer mold sleeve through these holes to bond the outer mold sleeve to the inner conical sleeve. The inner conical segment has mounting holes for fixing components on both sides. After fixing the fixing components in the mounting holes, the inner conical segments are initially connected and fixed. The fixing assembly includes two fixing plates. One side of each fixing plate is an inclined curved surface, and the other side is a semi-circular groove. After the two fixing plates are inserted from both sides of the inner conical segment, the semi-circular grooves on the two fixing plates align and assemble into a circular groove inside the inner conical segment. The diameter of this circular groove is the same as that of the CFRP cable, and together they preliminarily determine the axis of the CFRP cable. The fixing component is fixed in the fixing hole using a thermal expansion and contraction process, which generates a compression effect on the CFRP cable.

2. The segmental CFRP rod-cable composite anchoring system with internal and external molds according to claim 1, characterized in that, The large-diameter end of the inner conical segment has an internal thread structure, and the small-diameter end of the inner conical segment has an external thread structure. Adjacent inner conical segments are modularly assembled by passing the small-diameter end of the inner conical segment through the large-diameter end of the adjacent inner conical segment through a threaded connection.

3. An assembly method for an internal and external mold segmental CFRP bar-cable composite anchoring system, characterized in that, it is based on the internal and external mold segmental CFRP bar-cable composite anchoring system described in any one of claims 1-2, and is characterized in that, The assembly method includes the following steps: First, determine the anchoring length based on the diameter of the CFRP cable to be anchored, and then determine the number of inner conical segments. Connect several inner conical segments end to end to assemble them into a cone stacking system. Insert the fixing plate into several inner mold fixing component mounting holes on the inner conical sleeve. Pass the CFRP cable through the circular groove formed by each pair of fixing plates from one end of the cone stacking system. After the CFRP cable passes through the other end of the cone stacking system, the fixing plate is squeezed by the thermal expansion and contraction process to put the CFRP cable in a mechanical anchoring state. Adhesive is injected into the inner conical sleeve and the space between the outer mold sleeve and the large-diameter end of the conical sleeve stacking system and the outer mold injection hole, respectively. The plug is then passed through the CFRP cable and secured to the outer mold sleeve. After the adhesive has solidified, the anchoring system construction is completed.

4. The assembly method of the internal and external mold segmental CFRP rod-cable composite anchoring system according to claim 3, characterized in that, By employing a cooling process to achieve radial shrinkage of the fixed plate, the inner conical sleeve system connected by the slightly larger fixed plate can be smoothly inserted into the outer mold sleeve. After the cooling process, the system is slowly inserted into the outer mold sleeve, and the CFRP cable passes through the central hole at one end of the outer mold sleeve until the small-diameter end of the stacked inner conical sleeve system is pressed against the closed end of the central hole of the outer mold sleeve. The system connected to the outer mold sleeve is then placed at room temperature, and the temperature of the fixed plate can be restored by natural or artificial heating, resulting in a slight increase in its radial dimension. The fixed plate and the outer mold sleeve generate a compression effect, and the compression force is transmitted to the CFRP cable through the fixed plate, putting the CFRP cable in a mechanically anchored state.

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