A three-stage double-anchor continuous jack

Abstract

The present invention discloses a three-stage double-anchor continuous jack, which comprises a base slide, a double-anchor tool anchor, a guide frame, a threading frame, a front jack (first stage), a rear jack (second stage), an auxiliary jack (third stage), a strut, a reaction support and other structural components. The present invention provides a three-stage double-anchor continuous jack. In the continuous traction process, when a heavy material is difficult to be towed and moved, resulting in excessive tension on a steel strand and a safety risk of breaking, when the steel strand needs to be released by retreating, the oil pressure in the first and second jacks is first unloaded, and then the traction force on the first and second continuous jacks is released by the third-stage auxiliary jack, so as to further reduce the residual tension on the steel strand. At the same time, the push rod in the double-anchor tool anchor pushes the tool clip when the oil returns to the bottom of the cylinder, and the rubber friction clip is pushed in, so that the force on the rubber friction clip in the double-anchor tool anchor is increased, and then the steel strand is clamped, and the friction force generated by the rubber friction clip clamping the steel strand is reduced to reduce the speed and vibration of the steel strand when it rebounds.

Description

Technical Field

[0001] The invention relates to a jack in the field of bridge construction, in particular to a continuous jack used for steel strand tensioning or steel box girder traction. Background Art

[0002] In the field of steel box girder bridge construction, affected by factors such as water area and construction conditions, it is usually necessary to store the steel box girder. For the beam storage method using continuous jacks and sliding devices, problems such as sliding devices or other external factors usually occur during the process of using steel strands to tension and pull the steel box girder, making it difficult to tow heavy materials such as steel box girders, which makes it easy for the steel strands to be over-tensioned and break.

[0003] When the above situation occurs, the current solution is generally to return the jack cylinder to its original position, unload the oil pressure, use the push rod to push out the tool clip in the working anchor and then release the steel strand, re-check the problem, and then put on the steel strand for re-traction. However, after the oil pressure is unloaded, there is still a large residual tensile stress on the steel strand. When the tool clip in the tool anchor is relaxed, the steel strand will continue to pop out tens of meters in the direction of the steel box girder due to the remaining large tensile force, which makes it extremely difficult to re-thread the steel strand and wastes a lot of work hours. At the same time, when the steel strand pops out, due to the fast speed and large elasticity, it will wear or damage the tool clip and even cause damage to the jack cylinder, resulting in property and construction period losses; and it may cause personal injury to surrounding workers, posing a great safety risk. Summary of the invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a three-stage double-anchor continuous jack, which can first return the oil cylinders in the first and second jacks to their original positions, and then release the traction force on the first and second continuous jacks through the third-stage auxiliary jack, thereby greatly reducing the residual tensile stress on the steel strand; further, the oil pressure in the first and second jacks is unloaded, and the rubber friction clip in the double-anchor tool anchor can be pushed in while the tool clip is pushed out by the push rod, so that the rubber friction clip can clamp the steel strand, thereby increasing the clamping force and friction force on the steel strand, and reducing its rebound speed and vibration. It can effectively solve the problem of excessive traction during continuous traction of the steel box girder but difficulty in moving the steel box girder or other problems that require the release of the steel strand, resulting in safety risks such as damage to the working clip and the jack, and fast pop-up speed and large elasticity of the steel strand due to the large residual tensile stress in the steel strand. At the same time, it can reduce the pop-up distance of the steel strand, reduce the time for re-threading the steel strand, save work time and improve efficiency.

[0005] The present invention is implemented in this way, constructing a three-stage double-anchor continuous jack, characterized in that it includes a base slide, an end cover, a front double-anchor tool anchor, a guide frame, a displacement sensor, a cylinder, a rear double-anchor tool anchor, a support rod, a threading frame, an auxiliary tool anchor, a support rod, a guide tube, a base, a reaction force bracket, a front jack, a rear jack, and an auxiliary jack; the front jack and the rear jack are connected by a support rod and are placed on the base slide at the same time; the auxiliary jack is connected to the rear jack through the support rod, and the auxiliary jack is connected to the reaction force bracket at the same time;

[0006] The rear jack and the auxiliary jack can drive the rear jack and the front jack to move forward and backward on the base slide plate through the support rod;

[0007] At the same time, an auxiliary jack 18 is arranged behind the base of the rear jack, which is a three-stage jack; the auxiliary jack also adopts a through-core structure, through which the steel strand passes and is anchored by the tool clip in the double-anchor tool anchor in the first and second jacks;

[0008] According to the three-stage double-anchor continuous jack described in the present invention, the characteristics are as follows: the double-anchor tool anchor structure mainly includes a rubber friction clip, a pre-tightening bolt, a front tool anchor, a pre-tightening spring, a tool clip, a rear tool anchor, and a push rod;

[0009] The tool anchor is provided with a double anchor system of a front tool anchor and a rear tool anchor. The front tool anchor and the rear tool anchor are connected by pre-tightening bolts, and are provided with a tool clip and a rubber friction clip, with a pre-tightening spring in the middle;

[0010] The double-anchor tool anchor adopts a bidirectional structure of two sets of tool anchors, which are connected together by connecting bolts. Tool clips and rubber friction clips are used respectively, and a pre-tightening spring is used in the middle. A push rod structure is set at the front end.

[0011] According to the three-stage double-anchor continuous jack described in the present invention, it is characterized in that the front and rear jacks use two through-type jacks, which are the first and second stage jacks, and are equipped with a front double-anchor tool anchor, a guide tube, a guide frame, a threading frame, and a displacement sensor.

[0012] According to the three-stage double-anchor continuous jack described in the present invention, it is characterized in that the front and rear jacks are assembled together through support rods, the control system collects signals from the displacement sensors on the front and rear jacks, and the pump station system controls the reciprocating motion of the front and rear jack cylinders, so that the load in the double-anchor tool anchor is alternated, thereby achieving the process of continuous traction of the steel box girder.

[0013] According to the three-stage double-anchor continuous jack described in the present invention, it is characterized in that the auxiliary tool anchor adopts the front tool anchor and rubber friction clip type single anchor structure in the double-anchor tool anchor, and the auxiliary tool anchor can be replaced with a double-anchor tool anchor structure as needed to further improve the safety factor.

[0014] According to the three-stage double-anchor continuous jack of the present invention, it is characterized in that it operates in the following manner;

[0015] When traction work is required, the steel strand is passed through the reaction support, base, guide tube, auxiliary tool anchor, threading rack, rear double-anchor tool anchor, front double-anchor tool anchor, and end cover in sequence; and the steel strand is anchored with the tool clips in the front and rear tool anchors. At this time, the auxiliary jack pushes the support rod to the maximum position, and the front jack and the rear jack slide to the farthest point in the traction direction on the base slide. During the auxiliary jack pushing process, it can also play a pre-tightening role on the steel strand before formal traction.

[0016] During the traction process, the displacement sensor feeds back the jack cylinder position signal to the control system, controlling the front and rear jacks to work alternately and reciprocately to achieve the purpose of continuous traction.

[0017] When heavy materials such as steel box girders are difficult to drag or other factors require the steel strands to be released and moved in the recovery direction, the pre-tightening bolts on the auxiliary tool anchors on the auxiliary jacks can be tightened first, so that the rubber friction clips in the auxiliary tool anchors can clamp the steel strands, increase the friction when the steel strands move in the recovery direction, and reduce the vibration during rebound; the front jack and the rear jack are further returned to the oil by the hydraulic system, so that the front tool anchor and the rear tool anchor move in the recovery direction, and the tension on the steel strands is initially reduced;

[0018] Recover the auxiliary jack, so that the front jack and the rear jack move in the recovery direction along the base slide, reduce the tension on the front jack and the rear jack, and further reduce the residual tension on the steel strand;

[0019] After the oil pressure of the front jack and the rear jack is released, the push rod in the double-anchor tool anchor pushes out the tool clip, and the clamping force applied by the tool clip on the steel strand disappears. At this time, the steel strand has a tendency to pop out quickly in the recovery direction. However, while the push rod pushes out the tool clip, it transmits the force to the preload spring, driving the rubber friction clip to move in the traction direction, so that the rubber friction clip clamps the steel strand. At this time, the steel strand moves slowly in the recovery direction under the clamping force and friction force of the rubber friction clips in the front double-anchor tool anchor and the rear double-anchor tool anchor;

[0020] Under the action of the auxiliary jack, the force on the front jack and the rear jack can be further released, thereby reducing the residual tension on the steel strand, greatly reducing the safety risks of fast speed and large elastic force caused by excessive residual tension during the release of the steel strand; at the same time, a double-anchor tool anchor was invented, which can release the clamping force on the tool clamp while pushing the rubber friction clamp in the opposite direction through the push rod, thereby increasing the clamping force applied to the steel strand by the rubber friction clamp, increasing the friction force of the steel strand when it retreats and releases, and further achieving the effect of reducing the excessive speed and excessive elastic force of the steel strand when it retreats; the rubber friction clamp can also play a shock-absorbing role while clamping the steel strand, reducing the vibration when the steel strand pops out, reducing the wear on the tool clamp, and reducing the damage to the jack body.

[0021] The present invention discloses a three-stage double-anchor continuous jack, which comprises a base slide, a double-anchor tool anchor, a guide frame, a threading frame, a front jack (first stage), a rear jack (second stage), an auxiliary jack (third stage), a strut, a reaction support and other structural components. The present invention provides a three-stage double-anchor continuous jack. In the continuous traction process, when it is difficult to pull, resulting in excessive tension on the steel strand and the risk of breaking the strand, when it is necessary to retreat and release the steel strand, the oil pressure in the first and second jacks is first unloaded, and then the traction force on the first and second continuous jacks is released by the third-stage auxiliary jack, so as to further reduce the residual tension on the steel strand. At the same time, the push rod in the double-anchor tool anchor pushes the tool clip when the oil returns to the bottom of the cylinder, and the rubber friction clip is pushed in, so that the force on the rubber friction clip in the double-anchor tool anchor is increased, and then the steel strand is clamped, and the friction force of the rubber friction clip on the steel strand is used to reduce the speed and vibration of the steel strand when it rebounds. The structure of the rubber friction clip in the third-level auxiliary jack and the double-anchor tool anchor can effectively solve the problem that during the continuous traction of heavy materials such as steel box girders, the traction force is too large but it is difficult to pull the steel box girders, or other problems occur when the steel strands need to be retreated and released. The steel strands rebound quickly, vibrate violently, and have a large elastic force, which leads to damage to the working clips and jacks. At the same time, it can also reduce the ejection distance of the steel strands when they are released and rebounded, reduce safety risks, and reduce the time for re-threading the steel strands, greatly saving work hours and improving efficiency.

[0022] The present invention has the following advantages:

[0023] (1) The use of three-stage continuous jacks can effectively solve the problem of excessive traction force on the steel strand or other problems that require the release of the steel strand when heavy materials such as steel box girders cannot be dragged. Due to the excessive residual tensile stress on the steel strand, the steel strand will rebound quickly and with great elasticity, resulting in property losses such as damage to tool clips and jacks, as well as excessive safety risks in the release process of the steel strand.

[0024] (2) The oil return process of the auxiliary jack can be used to drive the front and rear jacks to move in the recovery direction, release the traction on the front and rear jacks in advance, further reduce the residual tensile stress on the steel strand, and reduce the problems of too fast speed, too large elastic force, and long ejection distance during the release of the steel strand.

[0025] (3) A double-anchor tool anchor structure is adopted. When the push rod pushes out the tool clip, the force on the tool clip decreases while the force on the rubber friction clip increases. At this time, the rubber friction clip clamps the steel strand, which can increase the friction force during the retraction of the steel strand, reduce the speed and vibration of the steel strand during retraction, reduce the wear of the steel strand on the tool clip, and avoid damage to the jack cylinder.

[0026] (4) The double-anchor tool anchor structure connected by a preloaded spring can prevent the steel strand from getting stuck during its retraction. At the same time, the gap between the front and rear tool anchors can be adjusted by the preloaded bolt, thereby adjusting the deformation of the preloaded spring and adjusting the friction force of the rubber friction clip on the steel strand.

[0027] (5) It can effectively improve the safety of the steel strand release and recovery process, reduce property losses such as wear of tool clips and damage to the jack cylinder, and at the same time reduce the ejection distance of the steel strand, reduce the time for workers to re-comb and re-thread the steel strand, and improve work efficiency.

[0028] (6) The tool anchors in each jack can be adjusted to single-anchor tool anchors and double-anchor tool anchors as needed, that is, the auxiliary tool anchor can be replaced with a double-anchor tool anchor structure to further improve the safety factor.

[0029] (7) The gap between the rubber friction clip and the steel strand can be pre-adjusted by the pre-tightening bolt, so that the rubber friction clip can be reused many times, reducing the replacement frequency and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the double-anchor tool anchor structure.

[0032] Among them: 1. Base slide; 2. Steel strand; 3. End cover; 4. Front double-anchor tool anchor (41. Rubber friction clip; 42. Preload bolt; 43. Front tool anchor; 44. Preload spring; 45. Tool clip; 46. Rear tool anchor; 47. Push rod); 5. Guide frame; 6. Displacement sensor; 7. Cylinder; 8. Rear double-anchor tool anchor; 9. Support rod; 10. Threading rack; 11. Auxiliary tool anchor; 12. Strut; 13. Guide tube; 14. Base; 15. Reaction bracket; 16. Front jack; 17. Rear jack; 18. Auxiliary jack.

[0033] The auxiliary tool anchor 11 adopts a single anchor structure of the front tool anchor 43 and the rubber friction clip 41 in the front double-anchor tool anchor 4. The auxiliary tool anchor 11 can be replaced with a double-anchor tool anchor structure as needed to further improve the safety factor. DETAILED DESCRIPTION

[0034] The following will be combined with the attached Figure 1-Figure 2 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The present invention provides a three-stage double-anchor continuous jack through improvement. Figure 1 As shown, it includes a base slide 1, an end cover 3, a front double-anchor tool anchor 4, a guide frame 5, a front jack 6, a cylinder 7, a rear double-anchor tool anchor 8, a rear jack 9, an auxiliary jack 13, a base 14, a reaction support 15, a front jack 16, a rear jack 17, and an auxiliary jack 18; the front jack 16 and the rear jack 17 are connected by a support rod 9 and are placed on the base slide 1 at the same time; the auxiliary jack 18 is connected to the rear jack 17 through a support rod 12, and the auxiliary jack 18 is connected to the reaction support 15 at the same time.

[0036] The rear jack 17 and the auxiliary jack 18 can drive the rear jack 17 and the front jack 16 to move forward and backward on the base slide 1 through the support rod 12;

[0037] At the same time, an auxiliary jack 18 is arranged behind the base of the rear jack 17, which is a three-stage jack; the auxiliary jack adopts the same through-core structure, through which the steel strand passes and is anchored by the tool clip in the double-anchor tool anchor in the first and second stage jacks;

[0038] Reference Figure 2As shown, the double-anchor tool anchor structure mainly includes a rubber friction clip 41, a pre-tightening bolt 42, a front tool anchor 43, a pre-tightening spring 44, a tool clip 45, a rear tool anchor 46, and a push rod 47.

[0039] The three-stage double-anchor continuous jack described in the present invention operates in the following manner:

[0040] See also Figure 1 When traction is required, the steel strand 2 is passed through the reaction support 15, the base 14, the guide tube 13, the auxiliary tool anchor 11, the threading frame 10, the rear tool anchor 8, the front tool anchor 4, and the end cover 3 in sequence; and the steel strand 2 is anchored with the tool clips 45 in the front and rear tool anchors. At this time, the auxiliary jack 18 pushes the support rod 12 to the maximum position, and the front jack 16 and the rear jack 17 slide to the farthest point in the traction direction on the base slide 1. During the pushing process of the auxiliary jack 12, it can also play a pre-tightening role on the steel strand before the formal traction.

[0041] During the traction process, the position signal of the jack cylinder 7 is fed back to the control system through the displacement sensor 6, and the front and rear jacks are controlled to work alternately and reciprocatingly to achieve the purpose of continuous traction.

[0042] When heavy materials such as steel box girders are difficult to drag or other factors require the steel strands to be released and moved in the recovery direction, the pre-tightening bolts 42 on the auxiliary tool anchor 11 on the auxiliary jack 18 can be tightened first, so that the rubber friction clips in the auxiliary tool anchor 11 clamp the steel strand 2, increase the friction when the steel strand moves in the recovery direction, and reduce the vibration during rebound. The front jack 16 and the rear jack 17 are further returned through the hydraulic system, so that the front tool anchor 4 and the rear tool anchor 8 move in the recovery direction, and the tension on the steel strand 2 is initially reduced.

[0043] Furthermore, the auxiliary jack 18 is recovered, so that the front jack 16 and the rear jack 17 move in the recovery direction along the base slide 1, reducing the tension on the front jack 16 and the rear jack 17, and further reducing the residual tension on the steel strand 2.

[0044] Further, the oil pressure of the front jack 16 and the rear jack 17 is released, referring to Figure 2As shown, at this time, the push rod 47 in the front double-anchor tool anchor 4 pushes out the tool clip 45, and the clamping force applied by the tool clip 45 on the steel strand 2 disappears. At this time, the steel strand 2 has a tendency to pop out quickly in the recovery direction, but while the push rod 47 pushes out the tool clip 45, it transmits the force to the preload spring 44, driving the rubber friction clip 41 to move in the traction direction, so that the rubber friction clip 41 clamps the steel strand. At this time, the steel strand 2 moves slowly in the recovery direction under the action of the clamping force and friction force of the rubber friction clip 41 in the front double-anchor tool anchor 4 and the rear double-anchor tool anchor 8.

[0045] Through the action of the auxiliary jack 18, the force on the front jack 16 and the rear jack 17 can be further released, thereby reducing the residual tension on the steel strand, greatly reducing the safety risks of the steel strand 2 during the release process due to excessive residual tension, resulting in high speed and high elasticity. At the same time, a double-anchor tool anchor 4 is invented, which can push the rubber friction clamp 41 to move in the opposite direction while releasing the clamping force on the tool clamp 45, thereby increasing the clamping force applied by the rubber friction clamp 41 on the steel strand 2, increasing the friction force of the steel strand 2 when retreating and releasing, and further achieving the effect of reducing the excessive speed and excessive elasticity of the steel strand 2 when retreating. The rubber friction clamp 41 can play a role in cushioning while clamping the steel strand, reducing the vibration when the steel strand 2 pops out, reducing the wear on the tool clamp 45, and reducing the damage to the jack body.

[0046] The advantages of the present invention are:

[0047] (1) The use of three-stage continuous jacks can effectively solve the problem of excessive traction force on the steel strands or other problems that require the release of the steel strands when the steel box girder is unable to be dragged. Due to the excessive residual tensile stress on the steel strands, the steel strands rebound quickly and with great elasticity when released, resulting in property losses such as damage to the tool clips and jacks, as well as excessive safety risks during the release of the steel strands.

[0048] (2) The oil return process of the auxiliary jack can be used to drive the front and rear jacks to move in the recovery direction, release the traction on the front and rear jacks in advance, further reduce the residual tensile stress on the steel strand, and reduce the problems of too fast speed, too large elastic force, and too long ejection distance during the release of the steel strand.

[0049] (3) The double-anchor tool anchor structure is adopted. When the tool clip is pushed out by the push rod, the force on the tool clip is reduced while the force on the rubber friction clip is increased. At this time, the rubber friction clip clamps the steel strand, which can increase the friction force during the steel strand retreat process, reduce the speed and vibration of the steel strand retreat, reduce the wear of the steel strand on the tool clip, and avoid damage to the jack cylinder.

[0050] (4) It can effectively improve the safety of the steel strand release and recovery process, reduce property losses such as wear of tool clips and damage to the jack cylinder, and at the same time reduce the ejection distance of the steel strand, reduce the time for workers to re-comb and re-thread the steel strand, and improve work efficiency.

[0051] (5) The tool anchors in each jack can be adjusted to single-anchor tool anchors and double-anchor tool anchors as needed. The auxiliary tool anchor can be replaced with a double-anchor tool anchor structure to further improve the safety factor.

[0052] (6) The gap between the rubber friction clip and the steel strand can be pre-adjusted by the pre-tightening bolt, so that the rubber friction clip can be reused many times, reducing the replacement frequency and increasing the service life.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for using a three-stage double-anchor continuous jack, characterized in that: The three-stage double-anchor continuous jack comprises a base slide (1), an end cover (3), a front double-anchor tool anchor (4), a guide frame (5), a displacement sensor (6), an oil cylinder (7), a rear double-anchor tool anchor (8), a support rod (9), a threading frame (10), an auxiliary tool anchor (11), a support rod (12), a guide tube (13), a base (14), a reaction support (15), a front jack (16), a rear jack (17), and an auxiliary jack (18); the front jack (16) and the rear jack (17) are connected by a support rod (9) and are placed on the base slide (1); the auxiliary jack (18) is connected to the rear jack (17) through the support rod (12), and the auxiliary jack (18) is connected to the reaction support (15); The rear jack (17) and the auxiliary jack (18) are connected via the support rod (12) to drive the rear jack (17) and the front jack (16) to move forward and backward on the base slide plate (1); A set of auxiliary jacks (18) is arranged behind the base of the rear jack (17), which is a three-stage jack; the auxiliary jack adopts the same through-type structure as the front jack (16) and the rear jack (17), and the steel strand passes through it and is anchored by the tool clip in the double-anchor tool anchor in the first and second stage jacks; When traction is required, the steel strand (2) is passed through the reaction support (15), the base (14), the guide tube (13), the auxiliary tool anchor (11), the threading frame (10), the rear double-anchor tool anchor (8), the front double-anchor tool anchor (4), and the end cover (3) in sequence; and the steel strand (2) is anchored by the tool clips (45) in the front and rear tool anchors. At this time, the auxiliary jack (18) pushes the support rod (12) to the maximum position, and the front jack (16) and the rear jack (17) slide on the base slide plate (1) in the traction direction to the maximum position; during the pushing process of the auxiliary jack (18), it can also play a pre-tightening role on the steel strand before formal traction; During the traction process, the position signal of the jack cylinder (7) is fed back to the control system through the displacement sensor (6), thereby controlling the front and rear jacks to work alternately and reciprocatingly, thereby achieving the purpose of continuous traction; When the steel box girder is difficult to drag or other factors require the steel strand to be released and moved in the recovery direction, the pre-tightening bolt on the auxiliary tool anchor (11) on the auxiliary jack (18) can be tightened first, so that the rubber friction clip in the auxiliary tool anchor (11) clamps the steel strand (2), thereby increasing the friction force when the steel strand moves in the recovery direction and reducing the vibration during rebound; further, the front tool anchor (4) and the rear tool anchor (8) are moved in the recovery direction by the return oil front jack (16) and the rear jack (17) of the hydraulic system, thereby preliminarily reducing the tension on the steel strand (2); Further, the oil return auxiliary jack (18) causes the front jack (16) and the rear jack (17) to move in the recovery direction along the base slide plate (1), thereby reducing the tension on the front jack (16) and the rear jack (17), and further reducing the residual tension on the steel strand (2); After the oil pressure of the front jack (16) and the rear jack (17) is released, the push rod (47) in the front double-anchor tool anchor (4) pushes out the tool clamp (45), and the clamping force applied by the tool clamp (45) on the steel strand (2) disappears. At this time, the steel strand (2) has a tendency to pop out quickly in the recovery direction. However, while the push rod (47) pushes out the tool clamp (45), it transmits force to the preload spring (44), driving the rubber friction clamp (41) to move in the traction direction, so that the rubber friction clamp (41) clamps the steel strand. At this time, the steel strand (2) moves slowly in the recovery direction under the action of the clamping force and friction force of the rubber friction clamp (41) in the front double-anchor tool anchor (4) and the rear double-anchor tool anchor (8); Under the action of the auxiliary jack (18), the action force on the front jack (16) and the rear jack (17) can be further released, thereby reducing the residual tension on the steel strand, greatly reducing the safety risk of the steel strand (2) being released due to excessive residual tension, resulting in high speed and high elasticity; at the same time, a double-anchor tool anchor (4) is invented, which can release the clamping force on the tool clamp (45) while pushing the rubber friction clamp (41) to move in the opposite direction, thereby increasing the clamping force applied by the rubber friction clamp (41) to the steel strand (2), increasing the friction force of the steel strand (2) when it retreats and releases, and further achieving the effect of reducing the excessive speed and excessive elasticity when the steel strand (2) retreats; the rubber friction clamp (41) can play a shock-absorbing role while clamping the steel strand, reducing the vibration when the steel strand (2) pops out, reducing the wear on the tool clamp (45), and reducing the damage to the jack body.

2. The method for using a three-stage double-anchor continuous jack according to claim 1, characterized in that: The front jack (16) and the rear jack (17) adopt a double-anchor tool anchor structure, which mainly includes a rubber friction clamp (41), a pre-tightening bolt (42), a front tool anchor (43), a pre-tightening spring (44), a tool clamp (45), a rear tool anchor (46), and a push rod (47); The double-anchor tool anchor has a double anchor system of a front tool anchor (43) and a rear tool anchor (46), the front tool anchor (43) and the rear tool anchor (46) are connected by a pre-tightening bolt (42), and are provided with a tool clamp (45) and a rubber friction clamp (41), with a pre-tightening spring (44) in the middle; the double-anchor tool anchor adopts a bidirectional structure of two sets of tool anchors, which are connected together by connecting bolts, respectively using a tool clamp and a rubber friction clamp, connected in the middle by a pre-tightening spring, and a push rod (47) structure is provided at the front end.

3. The method for using a three-stage double-anchor continuous jack according to claim 1, characterized in that: The double-anchor tool anchor adopts a bidirectional structure of two sets of tool anchors, and a preload spring (44) is used in the middle to connect them. The preload spring (44) can prevent the steel strand from getting stuck during the retraction process. At the same time, the gap between the front and rear tool anchors can be adjusted by the preload bolt (42), thereby adjusting the deformation of the preload spring, thereby adjusting the clamping force applied by the rubber friction clamp (41) to the steel strand (2).

4. The method for using the three-stage double-anchor continuous jack according to claim 1, characterized in that: The front and rear jacks adopt two through-type jacks, which are the first and second level jacks, and are equipped with a front double-anchor tool anchor (4), a guide frame (5), a displacement sensor (6), an oil cylinder (7), a rear double-anchor tool anchor (8), a support rod (9), a threading frame (10), and a guide tube (13).

5. The method for using the three-stage double-anchor continuous jack according to claim 1, characterized in that: The front and rear jacks are assembled together via a support rod (9), and the control system collects signals from the displacement sensors (6) on the front and rear jacks. The pump station system controls the reciprocating motion of the front and rear jack cylinders, so that the loads in the double-anchor tool anchor work alternately, thereby achieving a process of continuously pulling the steel box girder.

6. The method for using a three-stage double-anchor continuous jack according to claim 1, characterized in that: The auxiliary tool anchor (11) adopts a single anchor structure of the front tool anchor (43) and the rubber friction clip (41) in the front double-anchor tool anchor (4). The auxiliary tool anchor (11) is replaced with a double-anchor tool anchor structure as required, thereby further improving the safety factor.

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