Composite anchoring inhaul cable

Abstract

The utility model discloses a composite anchoring inhaul cable, which relates to the technical field of prestress tension and comprises a cable body consisting of a plurality of unbonded steel strands, a sealing nut is sleeved outside the end head of the cable body, the sealing nut is sequentially connected with a sealing cylinder, an extension cylinder and an anchor cup along the direction of the end head of the cable body, an anchoring sleeve is arranged in the anchor cup, and the extension cylinder is connected with the anchoring sleeve. The outer end of the anchoring sleeve is correspondingly provided with an extrusion sleeve, each steel strand dispersed from the end of the cable body penetrates into the corresponding extrusion sleeve, and extrusion insertion pieces are arranged between the extrusion sleeves and the steel strands. A cavity between the steel strand and the sealing cylinder and a cavity between the extension cylinder and the anchor cup are filled with chilled casting filler to form a chilled casting filler layer. Compared with the prior art, the high-performance requirement of the current engineering design for the inhaul cable is met, and powerful guarantee is provided for the safety and the service life of large infrastructures such as bridges and buildings.

Description

TECHNICAL FIELD

[0001] The utility model relates to prestressed tension technology field especially a kind of composite anchorage cable. BACKGROUND

[0002] With the rapid development of social economy, the construction demand of large-scale infrastructure such as bridge and building is increasing. As the core load-bearing component of these structures, the performance of cable directly relates to the safety and service life of the entire project. Currently, the market's performance requirements for cable are continuously improving, especially in static load anchoring performance and fatigue performance. However, most of the cables in the prior art only use single extrusion anchor anchoring or cold casting filler method, although it can meet certain static load anchoring performance requirements, such as static load anchoring performance not less than 95% ftk, but in terms of fatigue performance, especially the number of cycles under high stress amplitude, there is still room for improvement. For example, the cable in the prior art can usually only meet the condition of no broken wires under the condition of upper limit stress of 0.45 ftk, stress amplitude of 200 MPa and cycle number of 2 million times. If the stress amplitude is higher than 200 MPa, there may be a broken wire problem. SUMMARY

[0003] The utility model provides a kind of composite anchorage cable, it can solve the problem of existing steel strand cable in fatigue performance.

[0004] To solve the above problems, the utility model adopts the technical scheme: it includes the cable body composed of a plurality of unbonded steel strands, a sealing nut is sleeved on the end of the cable body, the sealing nut is sequentially connected with a sealing cylinder, an extension cylinder and an anchor cup in the direction of the end of the cable body, an anchor sleeve is arranged in the anchor cup, an extrusion sleeve is arranged at the outer end of the anchor sleeve, each of the steel strands dispersed from the end of the cable body is inserted into the respective extrusion sleeve, an extrusion insert is arranged between the extrusion sleeve and the steel strand, and a cold casting filler layer is formed by filling the cold casting filler in the cavity between the steel strand and the sealing cylinder, the extension cylinder and the anchor cup.

[0005] In the above composite anchorage cable technical scheme, the more specific technical scheme can also be: the extrusion insert is a plug-in cylinder, a plurality of long slots passing through the inside and outside of the wall of the plug-in cylinder are symmetrically arranged along the length direction in the middle part of the plug-in cylinder, the distance H from the long slot end at either end of the long slot to the plug-in end at the same end of the plug-in cylinder is one-eighth of the length L of the long slot, and the width a of the long slot (8-1) is one-tenth of the length of the long slot.

[0006] Further, a sealing plate is extruded and arranged between the sealing nut and the inner hole step of the sealing cylinder, and a sealing ring is arranged between the sealing plate and the cable body.

[0007] Further, the two ends of the extension cylinder are connected with the sealing cylinder and the anchor cup through external threads respectively.

[0008] Further, the inner hole of the anchor cup is provided with a step, and the anchor sleeve is arranged on the step, and a positioning sleeve is arranged on the outer end face of the anchor sleeve and fixed with the anchor sleeve through a screw.

[0009] Further, the cable body is composed of 3-37 un-bonded steel strands, and a double-layer HDPE outer sheath is hot-extruded outside the cable body, and a filling rope is filled in the gap between the steel strands and the double-layer HDPE outer sheath.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. Since the composite anchor cable simultaneously adopts the extrusion anchor anchoring structure and the cold-cast filler filling to form a cold-cast filler layer, the static load anchoring performance and the fatigue performance of the cable are significantly improved, the static load anchoring performance of the cable is not less than 95% ftk, and the fatigue performance of the cable meets the fatigue test of the upper limit stress of 0.45 ftk, the stress amplitude of 300 MPa and the cycle number of 2 million times, and no broken wire phenomenon occurs, which not only meets the high performance requirement of the cable in the current engineering design, but also provides a powerful guarantee for the safety and service life of large-scale infrastructure such as bridges and buildings.

[0012] 2. Since the extension cylinder is arranged between the sealing cylinder and the anchor cup, the overall length of the anchoring area is increased by increasing the extension cylinder, the tension can be more effectively dispersed and borne, the anchoring stability and safety of the cable are improved, the contact area of the steel strand and the cold-cast filler is increased, the friction between the cable and the anchoring system is improved, and the anchoring efficiency is improved.

[0013] 3. Since the extrusion insert is a whole insert cylinder, unevenness caused by the half insert when sleeved into the extrusion sleeve can be overcome, and since the middle part of the side wall of the insert cylinder is symmetrically provided with an even number of long slots penetrating in and out along the length direction, the extrusion stress will cause the insert to break at the slotted part, the whole insert can be divided into two halves or four halves, the broken half insert can well extrude and wrap the steel strand. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the utility model.

[0015] Figure 2 is a sectional view of the cable body of the utility model.

[0016] Figure 3It is the structure diagram of the extrusion plug-in piece of the utility model.

[0017] Figure 4 It is Figure 3 A-A sectional view of the utility model.

[0018] Figure 5 It is Figure 3 B-B sectional view of the utility model.

[0019] Serial number explanation:

[0020] Cable body 1, steel strand 1-1, sealing nut 2, sealing cylinder 3, inner hole step 3-1, extension cylinder 4, anchor cup 5, step 5-1, anchor sleeve 6, extrusion sleeve 7, extrusion plug-in piece 8, long groove 8-1, sealing plate 9, sealing ring 10, cold cast packing layer 11, screw 12, nut 13, positioning sleeve 14, filling rope 15, outer layer white HDPE sheath 16-1, inner layer black HDPE sheath 16-2. Specific embodiments

[0021] In order to make the above-mentioned purpose, features and advantages of the utility model more easily understood, the technical scheme in the embodiment of the utility model will be clearly and completely explained in combination with the drawings in the embodiment of the utility model. In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, therefore the utility model is not limited by the following disclosed specific embodiments.

[0022] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "middle", "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", "radial", "circumferential" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated position or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0023] As Figure 1 And Figure 2The shown embodiment includes a cable body 1 composed of a plurality of unbonded steel strands 1-1, which can be 3-37 unbonded steel strands; in some embodiments, the plurality of unbonded steel strands are wrapped with a double-layer HDPE outer sheath after being slightly twisted and wrapped, the double-layer HDPE outer sheath is an outer white HDPE sheath 16-1 and an inner black HDPE sheath 16-2, and a filling rope 15 is filled in the gap between the steel strands 1-1 and the inner black HDPE sheath, which not only ensures the overall strength of the cable body, but also improves its corrosion resistance and durability. The end of the cable body 1 is sleeved with a sealing nut 2, which is sequentially connected with a sealing cylinder 3, an extension cylinder 4 and an anchor cup 5 in the direction of the end of the cable body 1, the two ends of the extension cylinder 4 are connected with the sealing cylinder 3 and the anchor cup 5 through external threads, the anchor cup 5 is provided with an anchoring sleeve 6, the outer end of the anchoring sleeve is provided with an extrusion sleeve 7, each steel strand of the steel strands dispersed from the end of the cable body is inserted into the extrusion sleeve 7, and an extrusion insert 8 is arranged between the extrusion sleeve 7 and the steel strand 1-1, the steel strands can be anchored by using a special extrusion mold and extrusion equipment, so that each steel strand can be firmly fixed in the anchor cup; the cavity between the steel strands 1-1 and the sealing cylinder 3, the extension cylinder 4 and the anchor cup 5 is filled with cold casting filler to form a cold casting filler layer 11, the overall length of the anchoring area is increased by increasing the extension cylinder, which can more effectively disperse and bear the tension, and is helpful to improve the anchoring stability and safety of the cable, and can increase the contact area between the steel strands and the cold casting filler, which is helpful to improve the friction between the cable and the anchoring system, thereby improving the anchoring efficiency; the sealing plate 9 is extruded between the sealing nut 2 and the inner hole step 3-1 of the sealing cylinder 3, and the sealing ring 10 is arranged between the sealing plate and the cable body 1, which further seals the cold casting filler poured but not formed to make it form in the sealing cylinder; the inner hole of the anchor cup 5 is provided with a step 5-1, the anchoring sleeve 6 is arranged on the step 5-1, and the positioning sleeve 14 is arranged on the outer end surface of the anchoring sleeve 6, which is fixed with the anchoring sleeve 6 through the screw 12, and the steel strands and the extrusion sleeve after extrusion anchoring are positioned on the step surface of the inner hole of the anchor cup by the positioning sleeve, so as to ensure the stability and symmetry of the structure.

[0024] As Figures 3-5 The extrusion insert 8 of the present embodiment is an insert cylinder, a plurality of symmetrical long slots 8-1 are arranged on the wall of the insert cylinder, the distance H from the long slot end of any end of the long slot to the insert end of the same end of the insert cylinder is one-eighth of the length L of the long slot, and the width a of the long slot 8-1 is one-tenth of the length of the long slot. By arranging long slots with such length, the extrusion insert can be smoothly and stably inserted into the extrusion sleeve, and during the extrusion process, the extrusion insert can be broken along the long slot to form four halves tightly wrapped around the steel strand.

[0025] The anchoring process of the composite anchor cable is as follows:

[0026] After the HDPE outer sheath of the cable body end is stripped, the sealing nut, sealing ring, sealing plate, sealing cylinder, extension cylinder, anchor cup and anchoring sleeve are sequentially penetrated;

[0027] After the HDPE outer sheath of the cable body end is stripped, the steel strands are dispersed, each steel strand is sleeved into the extrusion insert and the extrusion sleeve, and the special extrusion mold and extrusion equipment are used to extrude and anchor each steel strand, so that the extrusion insert is broken into a half-type insert, and each steel strand can be firmly fixed in the anchor cup;

[0028] The steel strands and the extrusion sleeve after extrusion anchoring are positioned on the stepped surface of the inner hole of the anchor cup by the positioning sleeve, so as to ensure the stability and symmetry of the structure;

[0029] The prepared cold casting filler is poured from the end of the sealing cylinder, and the cavity between the steel strands, the sealing cylinder, the extension cylinder and the anchor cup is filled, so as to further enhance the anchoring effect and sealing performance;

[0030] Finally, the sealing plate and the sealing ring are assembled, the sealing nut is tightened, and the composite anchoring treatment of one end is completed;

[0031] The other end of the cable is operated in the same way according to the above steps, and finally the nuts 13 of both ends are assembled to complete the production of the whole composite anchor cable.

Claims

1. A composite anchoring cable, comprising a cable body (1) composed of multiple unbonded steel strands (1-1), characterized in that: The end of the cable body (1) is fitted with a sealing nut (2). The sealing nut is connected in sequence to a sealing cylinder (3), an extension cylinder (4) and an anchor cup (5) along the end of the cable body (1). The anchor cup (5) is filled with an anchoring sleeve (6). The outer end of the anchoring sleeve is correspondingly provided with a compression sleeve (7). Each of the steel strands that are distributed from the end of the cable body is inserted into its respective compression sleeve (7). A compression insert (8) is provided between the compression sleeve (7) and the steel strand (1-1). The cavity between the steel strand (1-1) and the sealing cylinder (3), the extension cylinder (4) and the anchor cup (5) is filled with cold casting filler to form a cold casting filler layer (11).

2. The composite anchoring cable according to claim 1, characterized in that: The extruded insert (8) is an insert cylinder. An even number of through slots (8-1) are symmetrically arranged along the length direction on the middle of the wall of the insert cylinder. The distance H from the end of the slot to the end of the insert cylinder at the same end is one-eighth of the length L of the slot. The width a of the slot (8-1) is one-tenth of the length of the slot.

3. The composite anchor cable according to claim 1, characterized in that: A sealing plate (9) is pressed between the sealing nut (2) and the inner hole step (3-1) of the sealing cylinder (3), and a sealing ring (10) is provided between the sealing plate and the cable body (1).

4. The composite anchor cable according to claim 1, characterized in that: The two ends of the extension tube (4) are connected to the sealing tube (3) and the anchor cup (5) respectively by external threads.

5. The composite anchoring cable according to claim 1, characterized in that: The inner hole of the anchor cup (5) is provided with a step (5-1), the anchor sleeve (6) is provided on the step (5-1), and a positioning sleeve (14) is provided on the outer end face of the anchor sleeve (6). The positioning sleeve is fixed to the anchor sleeve (6) by a screw (12).

6. The composite anchor cable according to claim 1, 2, 3, 4, or 5, characterized in that: The cable body (1) is composed of 3 to 37 unbonded steel strands (1-1). The cable body (1) is hot-extruded with a double-layer HDPE outer sheath, and a filler rope (15) is filled in the gap between the steel strands (1-1) and the double-layer HDPE outer sheath.

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