Assembled parallel steel strand extruded anchor cable and construction method

Abstract

The assembled parallel stranded steel wire extrusion anchor cable has anchor heads at both ends of the cable. The anchor heads include pads, threaded sleeves, nuts, anchor plates, and pressure sleeves. After the cable unit is pre-tensioned, the extrusion anchor on the anchor unit is extended beyond the anchor plate by a certain distance. The two-piece pressure sleeve is installed by buckling, and the pressure sleeve is released and retracted, so that the small cylinder of the pressure sleeve enters the hole of the anchor plate. The large cylinder carries the force transmission between the extrusion anchor and the anchor plate, so as to achieve the purpose of anchoring a unit. After all units are installed, the cable is tensioned as a whole, and the threaded sleeve follows up, and the nut is tightened to achieve the purpose of overall tensioning and anchoring. When replacement is required, the large nut is loosened first after the overall tensioning, and then the bearing sleeve is removed by individual tensioning to withdraw the cable unit individually for replacement. The role of the embedded pipe is to form a through hole for easy installation; the overall cable consists of multiple cable units, which are installed and tensioned one by one, and finally tensioned as a whole. This new process of breaking the whole into parts greatly reduces the use of large lifting equipment, saves costs, and provides reliable anchoring.

Description

Technical Field

[0001] The invention relates to a cable and a construction method, in particular to an assembled parallel steel strand extrusion anchor cable and a construction method. Background Art

[0002] Cable refers to the prestressed steel bundle installed between two anchors in bridge engineering. The steel bundle is composed of multiple prestressed tendons, and these steel bundles are called cables.

[0003] Cables are widely used in bridge construction projects and are a must for long-span bridges. Without cables, the construction of long-span bridges cannot be realized. Cables are mostly low-stress cables in engineering projects, with a maximum tension of 45% of the breaking strength. Currently, cold-cast anchor cables, integral extruded cables and clip-type cables are more commonly used. In large-scale projects, due to the limitations of weight and number of cables, the first two integral cables have their limitations. Although the clip-type cable can be broken down into parts for easy construction, its low-stress safety has always been a concern. A parallel steel strand cable with stable anchoring and convenient construction is needed. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an assembled parallel steel strand extruded anchor cable and a construction method which can be dispersedly installed, is replaceable and reduces costs.

[0005] The present invention is achieved through the following technical solutions: an assembled parallel steel strand extruded anchor cable, comprising a pad, a threaded sleeve is arranged in the middle position of the pad, an anchor plate is arranged on the left end of the threaded sleeve, a through hole for passing the cable unit is arranged on the anchor plate, a detachable anchoring device for anchoring the cable unit is arranged on the left end of the through hole, and an integral anchoring device for adjusting the distance between the threaded sleeve and the pad is arranged on the left side of the pad.

[0006] Furthermore, a pre-buried pipe is arranged at a position on the right side of the backing plate corresponding to the sleeve.

[0007] Furthermore, a sealing sleeve is provided at the right end of the embedded pipe for sealing with the steel strand.

[0008] Furthermore, the right end of the threaded sleeve is connected to a rightward extension tube, the right end of the threaded sleeve is inserted into the embedded pipe, the extension tube extends rightward out of the embedded pipe, and the sealing sleeve is placed at the joint between the embedded pipe and the extension tube.

[0009] Furthermore, an oil filling hole is provided at the lower left end of the threaded sleeve, and an exhaust hole is provided at the upper left end of the threaded sleeve.

[0010] Furthermore, the threaded sleeve is a trapezoidal thread, and the integral anchoring device is a nut sleeved outside the threaded sleeve.

[0011] Furthermore, the detachable anchoring device comprises an extrusion anchor 1 for anchoring the steel strand, and a detachable pressure sleeve is arranged between the extrusion anchor 1 and the through hole.

[0012] Furthermore, the left end of the pressure sleeve is tightly pressed against the extrusion anchor, and the right end of the pressure sleeve is tightly pressed against the anchor plate.

[0013] Furthermore, a shield for protecting the end of the steel strand is provided on the left side of the pad.

[0014] A construction method for an assembled parallel steel strand extruded anchor cable comprises the following steps:

[0015] Step 1: prefabricate the pad and embed the pipe into the concrete structure; preinstall the threaded sleeve, extension tube, anchor plate, pressure sleeve, nut, sealing sleeve, etc.;

[0016] Step 2: pre-tighten the end of the steel strand on a fixed-length anchor extrusion machine, and then fix an extrusion anchor 1 on the end of the steel strand to obtain a steel strand of a fixed-length anchor extrusion anchor, also called a cable unit;

[0017] Step 3: Pass the prefabricated cable unit to the left through the sealing sleeve, extension tube, threaded sleeve, and anchor plate in sequence, pull the cable unit until the extrusion anchor 1 extends to the left outside the anchor plate, and the right end of the cable unit is automatically fixed on the anchor plate at the right end. Install the pressure sleeve, and after the whole is tensioned, tighten the nut to compress the extrusion anchor 1, the pressure sleeve, and the anchor plate to achieve overall anchoring;

[0018] Step 4, injecting oil into the inner cavity of the threaded sleeve and the extension tube, and then sealing;

[0019] Step five, install the protective cover on the left side of the pad, wrap the left end of the prefabricated steel strand with the protective cover, inject oil into the protective cover, and then seal it. The installation, tensioning and protection of the assembled parallel steel strand extrusion anchor cable are completed.

[0020] Step six, when it is necessary to replace the cable, remove the protective cover, tension the cable as a whole to the left, loosen the nut to relieve the overall force first, then tension the cable unit individually, remove the pressure sleeve, and further remove the cable unit to replace the cable.

[0021] The beneficial effects of the present invention are as follows: the assembled parallel steel strand extrusion anchor cable has anchor heads at both ends of the cable, and the anchor heads include a pad, a threaded sleeve, a nut, an anchor plate, and a pressure sleeve. After the cable unit is pre-tensioned, the extrusion anchor on the anchor unit is made to extend beyond the anchor plate by a certain distance, and the two-piece pressure sleeve is installed by buckling, and the pressure sleeve is released and retracted, so that the small cylinder of the pressure sleeve enters the hole of the anchor plate, and the large cylinder carries the force transmission between the extrusion anchor and the anchor plate, so as to achieve the purpose of anchoring a unit. After all units are installed, the cable is tensioned as a whole, and the threaded sleeve follows up, and the nut is tightened to achieve the purpose of overall tensioning and anchoring. When replacement is required, the large nut is loosened first after the overall tensioning, and then the bearing sleeve is removed by individual tensioning to withdraw the cable unit individually for replacement. The role of the embedded pipe is to form a through hole for easy installation; the overall cable consists of multiple cable units, which are installed and tensioned one by one, and finally tensioned as a whole. This new process of breaking the whole into parts greatly reduces the use of large lifting equipment, saves costs, and has reliable anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a front cross-sectional view of Example 1;

[0023] Figure 2 It is a schematic diagram of the connection relationship between the anchor plate, sleeve, pad and extension tube;

[0024] Figure 3 It is a schematic diagram of the structure of the pressure sleeve;

[0025] Figure 4 It is a schematic diagram of the connection relationship between the sealing sleeve and the extension tube;

[0026] Figure 5 It is a schematic diagram of the connection relationship between the preload cylinder and the anchor head during installation;

[0027] Figure 6 It is a schematic diagram of a top view cross-section of a fixed-length steel strand extruder;

[0028] Figure 7 is a schematic diagram of a cross-sectional view of a support seat;

[0029] Figure 8 It is a schematic diagram of the cross-section of the right end of the second oil cylinder;

[0030] Among them: 1-steel strand, 2-shield, 3-oil filling hole, 4-exhaust hole, 5-extrusion anchor 1, 6-pressure sleeve, 601-top block, 602-guide head, 603-groove, 7-sleeve, 8-anchor plate, 9-nut, 10-pad, 11-extension tube, 12-embedded pipe, 13-sealing sleeve, 14-mouth clamp, 15-elastic layer, 16-support foot, 17-preload cylinder, 18-tool anchor plate, 19-clamp, 201 - reaction plate, 202- stud, 203- bottom plate one, 204- bottom plate two, 205- pressure seat, 206- extrusion anchor two, 207- left top pressure head, 208- oil cylinder one, 209- oil cylinder two, 210- connecting sleeve, 211- forming die, 212- top screw, 213- return spring, 214- top head two, 215- tightening sleeve, 216- top ring, 217- clip one, 218- spring sleeve, 219- top head one. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0033] Example 1

[0034] like Figure 1-8As shown, an assembled parallel steel strand pulling extrusion anchor cable; it consists of a cable body and an anchor head, the cable body consists of multiple cable units, the cable unit consists of a steel strand and an extrusion anchor anchored at a fixed length, the anchor head includes a pad 10, the pad is a steel plate, and has a high structural strength, a threaded sleeve 7 is installed in the middle position of the pad, the threaded sleeve is a cylinder, and the outer wall of the sleeve is processed with a trapezoidal thread, the threaded sleeve is installed in the middle position of the pad with clearance fit, an integral anchoring device for adjusting the distance between the threaded sleeve and the pad is installed on the left side of the pad, the integral anchoring device is a nut 9, the nut thread is sleeved outside the threaded sleeve, the nut is a round nut, and the outer wall of the nut is processed with a tool groove for rotating the nut, and the distance between the sleeve and the pad can be adjusted by twisting the nut, an anchor plate 8 is installed at the left end of the threaded sleeve, the anchor plate is a steel plate, and the right end of the anchor plate is integrally formed with a step, the right end of the anchor plate is inserted into the threaded sleeve through the step, and the tolerance between the step and the inner wall of the threaded sleeve is matched, which is convenient for positioning. The anchor plate has regularly arranged through holes for passing the steel strand 1. To facilitate the insertion of the steel strand, the right end of the through hole has a large chamfer. A detachable anchoring device for anchoring the cable unit is installed at the left end of the through hole. The detachable anchoring device includes an extrusion anchor 5 for anchoring the steel strand. The extrusion anchor is in the shape of a round tube and can pass through the through hole. The extrusion anchor is fixed on the steel strand. A detachable pressure sleeve 6 is installed between the extrusion anchor and the through hole. To facilitate installation, the pressure sleeve is composed of two pieces that are buckled together. The pressure sleeve includes a pressure sleeve top block 601 for tightening with the extrusion anchor and the anchor plate. The right end of the top block is integrally formed with a guide head 602 that can be inserted into the through hole. The outer side of the right end of the guide head is chamfered, and the gap between the guide head and the through hole is matched. The outer wall of the guide head is also processed with an annular groove 603. A C-type spring is installed in the groove, which can make the two pieces buckle together and then be sleeved on the steel strand to prevent falling off during installation. The anchor plate and the pressure sleeve are both high-frequency quenched and have a high surface hardness.

[0035] A pre-buried pipe 12 is installed at the position corresponding to the threaded sleeve on the right side of the pad. The pre-buried pipe is coaxially sleeved outside the sleeve. The left end of the pre-buried pipe is tightly pressed against the pad. The right end of the sleeve is coaxially connected with an extension tube 11 to the right. The male and female heads on the left end of the extension tube are inserted into the sleeve for easy installation. The extension tube extends to the right side of the pre-buried pipe. A sealing sleeve 13 for sealing with the steel strand is sleeved on the right end of the pre-buried pipe. The sealing sleeve is placed in the middle of the joint between the pre-buried pipe and the extension tube. The sealing sleeve is made of a heat shrink tube, which has low cost and good sealing effect.

[0036] A shield 2 for protecting the end of the steel strand is installed on the left side of the pad. The left end of the steel strand is located in the shield. A connecting ring is installed on the outer edge of the right end of the shield. The shield is connected to the pad by the connecting ring and bolts, which is convenient for installation. The lower left end of the threaded sleeve and the lower left end of the shield are both processed with oil filling holes 3, and the upper left end of the threaded sleeve and the upper left end of the shield are both processed with exhaust holes 4, which are convenient for injecting anti-corrosion grease, thereby providing anti-corrosion protection for the steel strand and the anchor head, thereby increasing the service life. At the same time, it is convenient to disassemble during replacement. When anti-corrosion grease is detected to be discharged from the exhaust hole, it proves that the oil filling is completed, and the oil filling hole and the exhaust hole are sealed.

[0037] The anchoring structures at both ends of the cable are the same, which facilitates unified production.

[0038] The construction method of the assembled parallel steel strand extruded anchor cable provided in this embodiment is as follows:

[0039] Step 1: prefabricate the pad and embed the pipe in the concrete component; preinstall the sleeve, extension tube, anchor plate, pressure sleeve, nut, sealing sleeve, etc.

[0040] Step 2: Make a cable unit in a fixed-length anchoring extruder. First, use an extrusion anchor to anchor one end of the steel strand, then pass the other end of the steel strand through the device, pre-tighten it, and extrusion anchor the extrusion anchor to obtain a fixed-length anchored prefabricated steel strand, called a cable unit;

[0041] Step 3: Pass the prefabricated cable unit to the left through the sealing sleeve, extension tube, threaded sleeve, and anchor plate in sequence. Pre-tension the single cable until the extrusion anchor extends to the left outside the anchor plate, install the pressure sleeve, and retract the anchor. After all the cable units are installed, tension the entire cable, and tighten the nut to compress the extrusion anchor, pressure sleeve, and anchor plate to achieve the purpose of overall anchoring.

[0042] Step 4: Fill the sleeve and extension tube with oil and then seal them;

[0043] Step five, install the shield on the left side of the pad, wrap the left end of the prefabricated steel strand with the shield, inject oil into the shield, and then seal it. The assembled parallel steel strands are squeezed into the anchor cable, and the tensioning and installation are completed.

[0044] Step 6: If problems are found later and the cable needs to be replaced, remove the protective cover, tension the cable to the left as a whole, loosen the nut and withdraw it, initially unload the whole force, then tension and remove the single cable unit, and replace the new cable; In step 2, make the cable unit, including the following steps,

[0045] A, calculate the cutting length of the steel strand, cut the steel strand, and the length of the steel strand is greater than the sum of the anchoring distance L0 and the pre-tightening operation length Ld;

[0046] B. If it is an unbonded steel strand, the protective layer at both ends of the steel strand needs to be stripped off. The first end is stripped off by a length greater than Ld, and an extrusion anchor 206 is fixed at the second end. First, one end is extruded and anchored;

[0047] C, placing the prefabricated steel strand on a fixed-length anchor extruder, pre-tightening it, and then fixing an extrusion anchor 1 at the first end, with the distance between the extrusion anchor 1 and the extrusion anchor 2 being L0;

[0048] In step C, the fixed-length anchor extruder includes a reaction frame, an opening for passing the steel strand is installed on the reaction frame, an extruder for extruding the extrusion anchor 1 is installed on the left side of the reaction frame, and the extruder is a through-type extruder. The extruder includes a support seat, the right end of the support seat is tightly pressed against the reaction frame, and the right end of the support seat is installed with a forming die 211 for tightening the extrusion anchor. For the convenience of maintenance, the support seat includes a bottom plate 1 203 and a bottom plate 204 parallel to each other, and the bottom plate 1 and the bottom plate 2 are connected by a stud 202 to facilitate the adjustment of the spacing. The forming die is installed on the bottom plate 1 through a die seat, and the die seat includes a connection connected to the bottom plate 1 The sleeve 210 has a cylindrical inner cavity, a cylindrical pressure seat 205 is installed in the sleeve, a mounting groove matching the forming die is machined in the pressure seat, the forming die is installed in the mounting groove according to the tolerance, and a plurality of top screws 212 for adjusting the position of the pressure seat are evenly installed on the sleeve to facilitate the adjustment of the position of the forming die. A cylinder 208 is installed on the bottom plate 2, a piston rod of the cylinder 1 is connected to a head 219, a left top pressure head 207 is installed in the head 1, an extrusion anchor 1 is installed on the right side of the left top pressure head, and the left top pressure head is detachably mounted on the steel strand. The left top pressure head is cylindrical and made of tool steel. The right end of the left top pressure head is processed into a right-facing truncated cone-shaped boss, and the left end of the forming die is processed with a tapered hole matching the boss. The right end of the tapered hole is coaxially connected to the cylindrical die cavity. The extrusion anchor 1 can be completely pushed into the die cavity through the left top pressure head, and the extrusion die formed by the extrusion is pushed out of the die cavity to the right. The extrusion is completed. The left end of the oil cylinder 1 is coaxially installed with the oil cylinder 209. The oil cylinder 1 and the oil cylinder 2 are both through-type jacks. The piston rod of the oil cylinder 2 is connected with the top head 214, and the top head 2 is pressed against the left end of the oil cylinder 1. The left end of the inner tube of the oil cylinder 2 is connected with a clamping sleeve for clamping the steel strand. The clamping sleeve includes a clamping sleeve installed at the right end of the oil cylinder 2. A clamp 217 is provided, and a tightening sleeve 215 for tightening the clamp 1 is also installed at the right end of the cylinder 2. A tapered hole matching the clamp 1 is provided at the left end of the tightening sleeve. Both the clamp and the clamp 1 are three-petal clamps. A return spring 213 for pushing the clamp 1 toward the tightening sleeve is also installed at the right end of the cylinder 2. For ease of use, the left end of the return spring is tightened against the cylinder 2, and the right end is connected with a spring sleeve 218. The spring sleeve can make the clamp 1 more evenly stressed, thereby making the clamping of the clamp 1 and the steel strand more stable. For the convenience of separation between the clamp 1 and the steel strand, a top ring 216 for pushing the clamp to the left is also installed in the head 2.

[0049] To further improve work efficiency, the reaction frame is composed of two parallel reaction plates 201. The spacing between the two reaction plates is adjusted according to the length of L0. The two reaction plates are processed with long strip openings that match the steel strands, and the long strip openings extend to the upper edge of the reaction plates.

[0050] The working principle of the fixed-length anchor extruder is as follows: the steel strand to be pre-tightened is placed on the fixed-length anchor extruder, and the extrusion anchor 2 is clamped on the right side of the reaction frame. The steel strand passes through the support seat, cylinder 1, and cylinder 2 to the left in turn. The cylinder 2 is started, and the inner and outer cylinders of the cylinder 2 move to the left, and the tightening sleeve moves to the left. The reset spring pushes the clamp 1 and the tightening sleeve to move relative to each other until the clamp 1 is clamped with the steel strand. The cylinder 2 continues to move to pre-tighten the steel strand. By controlling the oil pressure of the cylinder 2, the pre-tightening force can be controlled to ensure the pre-tightening effect of the steel strand. It can be cut off on the left side of the cylinder 2 as needed to obtain the steel strand of the required length. After the pre-tightening is completed, the cylinder 1 moves to push the extrusion anchor 1 to the right to squeeze The pressure anchor 1 is tightened by the forming die and then fixed to the steel strand. After the extrusion is completed, the oil cylinder 1 is reset first and the oil cylinder 2 is reset later. During the resetting process of the oil cylinder 2, the clamp 1 moves to the right until it hits the top ring and cannot move further. The tightening sleeve continues to move to the right, causing the clamp 1 to open and take out the prefabricated steel strand. The steps are simple, and the fixed-length steel strand can be quickly obtained, which is convenient for installation in conjunction with the assembled parallel steel strand extrusion anchor cable. During the working process, the oil pressure upper limit of the oil cylinder 2 is controlled by the overflow valve, thereby controlling the preload force on the steel strand. During the extrusion process, it can also ensure that the piston rod of the oil cylinder 2 moves with the steel strand to ensure that the steel strand is evenly stressed and avoid breaking the steel strand.

[0051] In the overall tensioning of step three, the cable is tensioned to the left through a tensioning device, which includes a support leg 16 for tightening against a pad, a tensioning cylinder 17 is installed at the left end of the support leg, and the tensioning cylinder is a through-type jack. The piston rod of the tensioning cylinder is leftward and tightly connected to a tool anchor plate 18. A hole matching the steel strand is machined on the tool anchor plate, and the left end of the hole is a tapered hole for cooperating with the clamp 19 to clamp the steel strand. The tensioning cylinder works, and after clamping the steel strand through the clamp, the steel strand is tensioned to the left, and the extrusion anchor moves to the left. There is a tendency for the extrusion anchor to loosen with the pressure sleeve and the anchor plate, and the nut is tightened immediately to eliminate the looseness.

[0052] Before the overall tensioning in step three, the sealing sleeve is first put on, and the tie-mouth fixture 14 is used to tie the steel strand bundle at the right side of the extension tube. For the convenience of installation, the tie-mouth fixture is composed of two petals, which are tightened and shrunk by bolts. An elastic layer 15 made of rubber is installed in the cavity to avoid rigid contact and make the tie-mouth uniform, thereby improving the tie-mouth effect. After the tensioning is completed, the heat shrink tube is blown with hot air to shrink and seal it to play a waterproof role.

[0053] When replacement is required, remove the protective cover, drain the anti-corrosion grease inside the protective cover, tension the whole, turn the nut, move the threaded sleeve back to the right, and unload the whole. When the whole is unloaded to the point where it can no longer be unloaded, it is necessary to remove each one individually, add a wire divider to the support leg, and use a single front clamp jack. Pre-stretch it after a certain stroke and then tension it. When the extrusion anchor is pulled out a distance greater than the height of the pressure sleeve, take out the pressure sleeve, release the anchoring, and replace the jack to eliminate all internal stress. If the internal stress cannot be completely relieved in one stroke, use a front clamp jack with a large stroke, or use an open anchor ring for relay anchoring, and unload it by inverting the top for easy operation.

[0054] The steel strands of the cable unit are unbonded steel strands with a protective layer of PE. The PE layer is wrapped with carbon fiber cloth, which can effectively increase toughness and improve anti-aging performance, thereby increasing service life.

[0055] The assembled parallel steel strand extruded anchor cable parallel steel strand cable and construction method provided by the present invention are easy to operate, reliable anchoring and uniform stress, and can ensure the quality of anchoring. Especially for large suspension bridges, the overall cable weight is very large and hoisting and erection are very difficult. By assembling multiple cables, the whole can be broken down into parts, which brings great convenience to construction.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled parallel steel strand extruded anchor cable, characterized in that: It includes a cable body and an anchor head, wherein the cable body is composed of a cable unit, the cable unit is composed of a steel strand and an extruded anchor of a fixed length anchor, the anchor head includes a pad, a threaded sleeve is arranged in the middle of the pad, an anchor plate is arranged at the left end of the threaded sleeve, a through hole for passing the cable unit is arranged on the anchor plate, a detachable anchoring device for anchoring the cable unit is arranged at the left end of the through hole, and an integral anchoring device for adjusting the distance between the threaded sleeve and the pad is arranged on the left side of the pad. A pre-buried pipe is arranged at the right side of the pad corresponding to the threaded sleeve. The right end of the embedded pipe is provided with a sealing sleeve for sealing with the steel strand. The right end of the threaded sleeve is connected to a rightward extension tube, the right end of the threaded sleeve is inserted into the embedded pipe, the extension tube extends rightward to the right side of the embedded pipe, and the sealing sleeve spans between the joint of the embedded pipe and the extension tube. The lower part of the left end of the sleeve is provided with an oil filling hole, and the upper part of the left end of the sleeve is provided with an exhaust hole. The threaded sleeve is a trapezoidal thread, and the integral anchoring device is a nut sleeved outside the threaded sleeve. The detachable anchoring device comprises a first extrusion anchor for clamping the steel strand, and a detachable pressure sleeve is arranged between the first extrusion anchor and the through hole. The left end of the pressure sleeve is pressed against the extrusion anchor, and the right end of the pressure sleeve is pressed against the anchor plate. A shield for protecting the end of the steel strand is arranged on the left side of the pad.

2. A construction method for the assembled parallel steel strand extruded anchor cable according to claim 1, characterized in that: The following steps are included: Step 1: prefabricate the pad and embedded pipe in the concrete structure; preinstall the sleeve, extension tube, anchor plate, pressure sleeve, nut, and sealing sleeve; Step 2, pre-tightening the end of the steel strand, and then fixing an extrusion anchor 1 at the end of the steel strand to obtain a prefabricated cable unit; Step 3: Pass the prefabricated cable unit to the left through the sealing sleeve, extension tube, threaded sleeve, and anchor plate in sequence, and pre-tension the single cable to the extrusion anchor and extend it to the left outside the anchor plate. The right end of the prefabricated cable unit is automatically anchored on the right end anchor plate, and the pressure sleeve is installed. The pre-tensioning force is withdrawn, and the pressure sleeve is clamped in the through hole to form a unit anchoring; Step 4: Add the support legs and the jack, tension the cable to the left as a whole, and tighten the nut to tighten the extrusion anchor 1, the pressure sleeve, and the anchor plate. Do not loosen them. After tensioning, further tighten the nut and withdraw the jack to form an overall anchor. Step 5, inject oil into the sleeve and the extension tube, and then seal them; Step six, install the shield on the left side of the pad, wrap the left end of the steel strand with the shield, inject oil into the shield, and then seal it, and the construction is completed.

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