A steel strand replacement continuous tensioning device suitable for a compact working space and an implementation method thereof

Abstract

The application relates to a steel strand replacement continuous tensioning device suitable for a compact operation space and an implementation method, and belongs to the technical field of bridge engineering. The device comprises a first adjusting screw rod group and a second adjusting screw rod group, the first adjusting screw rod group and the second adjusting screw rod group are arranged through a supporting plate, the first adjusting screw rod group corresponds to a first jacking jack group, the second adjusting screw rod group corresponds to a second jacking jack group, the first jacking jack group is arranged between the first adjusting screw rod group and an anchoring block, the second jacking jack group is arranged between the second adjusting screw rod group and the anchoring block, a threading hole is arranged on the supporting plate, a steel strand is arranged through the threading hole, a single-hole clamping piece anchor is arranged on the steel strand, and the single-hole clamping piece anchor abuts against the end surface of the supporting plate. The application is suitable for the construction operation of a compact operation space, can realize the operation of continuous tensioning, and improves the work efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to a steel strand replacement continuous tensioning device suitable for a compact operation space and an implementation method, and belongs to the technical field of bridge engineering. BACKGROUND

[0002] A cable made of prestressed steel strand, a clamping piece type anchor and other materials has been widely applied to bridge and building structure engineering. In the construction installation process, the conventional method for steel strand tensioning is to use a through-type jack for tensioning, and the steel strand cable needs to be reserved with a long tensioning working length. When tensioning, a tensioning support is first installed, and then the working length section of the steel strand is inserted into the center hole of the jack for tensioning. Since the jack is installed back and forth during operation, a long longitudinal operation space is needed. When the steel strand cable reaches the replacement period, the steel strand needs to be unloaded and released by using the jack. Since the jack has a limited stroke, a temporary conversion anchoring support needs to be arranged, so a longer longitudinal operation space is needed.

[0003] Due to the limitation of the existing construction technology, the tensioning and replacement of the steel strand cable need a large operation space, which limits the design of the compact space structure of the bridge and building structure designer, especially the reinforcement design of some old bridges. The design of the anchoring structure of the steel strand cable is difficult due to the innate conditions. In the replacement construction of the old bridge steel strand cable, there are occasions with a narrow operation space, so that the replacement and tensioning operation of the steel strand cable is very difficult. SUMMARY

[0004] The application aims to solve the above problems by providing a steel strand replacement continuous tensioning device suitable for a compact operation space and an implementation method.

[0005] The technical scheme adopted by the application to solve the above problems is as follows: a steel strand replacement continuous tensioning device suitable for a compact operation space, comprising a first adjusting screw group and a second adjusting screw group, the first adjusting screw group and the second adjusting screw group are arranged through a supporting plate, the first adjusting screw group corresponds to a first jacking jack group, the second adjusting screw group corresponds to a second jacking jack group, the first jacking jack group is arranged between the first adjusting screw group and an anchoring block, and the second jacking jack group is arranged between the second adjusting screw group and the anchoring block; a threading hole is formed in the supporting plate, a steel strand is arranged through the threading hole, a single-hole clamping piece anchor is arranged on the steel strand, and the single-hole clamping piece anchor abuts against the end face of the supporting plate.

[0006] The supporting plate is provided with N thread holes arranged in a ring shape and uniformly distributed, the thread holes correspond to the first adjusting screw rod set and the second adjusting screw rod set, and the first adjusting screw rod set and the second adjusting screw rod set are respectively threadedly connected with the supporting plate.

[0007] The N is an arbitrary integer between 4 and 10.

[0008] The first adjusting screw rod set comprises a plurality of first adjusting screw rods, and the second adjusting screw rod set comprises a plurality of second adjusting screw rods, and the first adjusting screw rods and the second adjusting screw rods are arranged in a staggered manner.

[0009] A bottom of one of the first adjusting screw rods in the first adjusting screw rod set, a bottom of one of the second adjusting screw rods in the second adjusting screw rod set and an anchor bottom part of the single-hole clamping piece are respectively provided with a pressure sensor.

[0010] The first jacking jack set comprises a plurality of first jacking jacks, and the second jacking jack set comprises a plurality of second jacking jacks, and the first jacking jacks are respectively communicated with the first total oil pipe through first oil distribution pipes, and the second jacking jacks are respectively communicated with the second total oil pipe through second oil distribution pipes; and the first total oil pipe and the second total oil pipe are respectively connected to a pump station control system.

[0011] The first total oil pipe is provided with a first distribution valve, and the second total oil pipe is provided with a second distribution valve.

[0012] A base plate is arranged outside the anchor plate, and a positioning connecting hole is arranged on the base plate, and the first jacking jacks and the second jacking jacks are arranged in the positioning connecting hole.

[0013] An implementation method of a steel strand replacement continuous tensioning device suitable for a compact working space, the implementation method comprising the following steps:

[0014] Step one: tensioning device assembly

[0015] a. Install the supporting plate, pass the steel strand to be replaced through the supporting plate, install the single-hole clamping piece anchor, abut the end face of the single-hole clamping piece anchor with the end face of the supporting plate, and tighten the single-hole clamping piece anchor;

[0016] b. The first adjusting screw rod and the second adjusting screw rod are respectively arranged through the supporting plate and are threadedly connected with the supporting plate;

[0017] c. The first jacking jacks and the second jacking jacks are arranged in a staggered manner and are installed outside the anchor plate.

[0018] Step two: hydraulic oil circuit connection

[0019] The first jacking jack set is connected with the first total oil pipe, the first jacking jack set is connected with the second total oil pipe, and after being converged, the first jacking jack set is connected to the pump station control system.

[0020] Step three: tensioning device adjustment preparation

[0021] a, start the pump station control system, the first jacking jack group and the second jacking jack group each piston stretch L1;

[0022] b, rotate the first adjusting screw group, the end face of each first adjusting screw is in close contact with each piston of the first jack group;

[0023] c, rotate the second adjusting screw group, the end face of each second adjusting screw is at a distance L2 from each piston of the second jack group, and L2 < L1;

[0024] Step four: steel strand replacement operation

[0025] a, start the pump station control system, the first jacking jack's piston continues to push out, the support plate drives the single-hole clamping anchor to stretch the steel strand outward until the working clamp in the anchor plate is pulled out, and the working clamp is removed;

[0026] b, start the pump station control system, the first jacking jack slowly bleeds, the support plate approaches the first jacking jack, the distance L2 between the second adjusting screw group and the second jacking jack group gradually decreases until the end of the second adjusting screw and the end face of the second jacking jack piston are in contact; when the pressure value of the pressure sensor set in the first adjusting screw is 0, at this time, the tension of the steel strand is converted to the second jacking jack group through the single-hole clamping anchor and the support plate.

[0027] c, when the pressure value of the pressure sensor set in the first adjusting screw is 0, rotate the first adjusting screw group to move the first adjusting screw away from the first jacking jack, and then start the pump station control system again to make the piston of the first jacking jack stroke L1 again, and the end face of the first adjusting screw is at a distance L2 from the piston of the first jacking jack, and L2 < L1;

[0028] d, start the pump station control system, the second jacking jack group slowly bleeds, the support plate approaches the second jacking jack, the distance L2 between the first adjusting screw and the first jacking jack piston gradually decreases until the end of the first adjusting screw and the end face of the first jacking jack piston are in contact; when the pressure value of the pressure sensor set in the first adjusting screw is 0, at this time, the tension of the steel strand is converted to the first jacking jack group through the single-hole clamping anchor and the support plate.

[0029] e, repeat the operations of b, c, and d in step four until the tension of the steel strand is completely relaxed;

[0030] f, complete the release of the steel strand to be replaced, and then replace the new steel strand according to the conventional construction method;

[0031] g, the tensioning of the new steel strand can be completed by the reverse process of the above operation.

[0032] Compared with the prior art, the advantages of the present application are that a steel strand replacement continuous tensioning device suitable for compact operation space,

[0033] 1. The replacement, release and tensioning of the steel strand do not need to use a through-type jack, which greatly saves the operation space.

[0034] 2. The needs of compact space design of engineering structures can be met, and the development of engineering construction technology is adapted.

[0035] 3. The continuous tensioning function can be realized by the group control of the jacking jack, and the tensioning control with sensing function is further implemented, which reduces the workload of manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a schematic view of a steel strand replacement continuous tensioning device suitable for compact operation space according to an embodiment of the present application;

[0037] Figure 2 is Figure 1 a sectional view of A-A;

[0038] Figure 3 is Figure 2 a sectional view of B-B;

[0039] Figure 4 is a schematic view of jack stroke conversion;

[0040] Figure 5 is a schematic view of the connection of the jack and pump station control system;

[0041] Figure 6 is a schematic view of tensioning control with sensing function;

[0042] Figure 7 is a schematic view of a steel strand replacement continuous tensioning device suitable for compact operation space with a base plate;

[0043] In the figure, 1 is a single-hole clamping piece anchor, 2 is a supporting plate, 3 is a first adjusting screw, 4 is a first jacking jack, 5 is a second adjusting screw, 6 is a second jacking jack, 7 is a pressure sensor, 8 is a steel strand, 9 is a working clamping piece, 10 is an anchor plate, 11 is an anchoring block, 12 is a base plate, 21 is a first oil distribution pipe, 22 is a first distribution valve, 23 is a first oil main pipe, 31 is a second oil distribution pipe, 32 is a second distribution valve, 33 is a second oil main pipe, and 40 is a pump station control system. DETAILED DESCRIPTION

[0044] The application will be further described in detail below with reference to the embodiments of the drawings.

[0045] As shown in Figure 1 , 2 , the steel strand replacement and continuous tensioning device suitable for compact operation space in the embodiment comprises a first adjusting screw group and a second adjusting screw group, the first adjusting screw group and the second adjusting screw group are arranged through the supporting plate 2, and the first adjusting screw group and the second adjusting screw group are threadedly connected with the supporting plate 2; the first adjusting screw group and the second adjusting screw group are rotated to move the first adjusting screw group and the second adjusting screw group. The anchor plate 10 is provided with a first jacking jack group and a second jacking jack group around the periphery, the first adjusting screw group corresponds to the first jacking jack group, the second adjusting screw group corresponds to the second jacking jack group, and the first jacking jack group and the second jacking jack group are arranged on the side surface of the anchoring block 11. The supporting plate 2 is provided with a threading hole, the steel strand 8 is arranged through the threading hole, and the single-hole clamping piece anchor 1 is arranged on the steel strand 8 and abuts against the end surface of the supporting plate 2.

[0046] Six thread holes uniformly distributed in a ring are arranged on the supporting plate 2, the first adjusting screw group comprises three first adjusting screws 3, the second adjusting screw group comprises three second adjusting screws 5, and the first adjusting screws 3 and the second adjusting screws 5 are arranged in a staggered manner, and the thread holes correspond to the first adjusting screws 3 and the second adjusting screws 5.

[0047] As shown in Figure 4 , 5 , the first jacking jack group comprises three first jacking jacks 4, the second jacking jack group comprises three second jacking jacks 6, the first jacking jacks 4 correspond to the first adjusting screws 3, and the second jacking jacks 6 correspond to the second adjusting screws 5. The first jacking jacks 4 are respectively communicated with the first total oil pipe 23 through the first oil distribution pipes 21, the second jacking jacks 6 are respectively communicated with the second total oil pipe 33 through the second oil distribution pipes 31, the first total oil pipe 23 is provided with a first distribution valve 22, and the second total oil pipe 33 is provided with a second distribution valve 32. The first total oil pipe 23 and the second total oil pipe 33 are respectively connected to the pump station control system 40, and the pump station control system 40 has the functions of individual control of each jacking jack group and linkage control of all jacking jacks.

[0048] As shown in Figure 6 , a pressure sensor is arranged on the bottom of one of the first adjusting screws in the first adjusting screw group, the bottom of one of the second adjusting screws in the second adjusting screw group and the bottom of the single-hole clamping piece anchor respectively, and the data line of the pressure sensor is connected to the pump station control system to realize automatic tensioning control with sensing function and reduce the workload of manual operation.

[0049] As shown in Figure 7As shown, in order to facilitate the installation and positioning of the six jacking jacks, a base plate 12 is further provided, which is installed outside the anchor plate 10. Six positioning connecting holes are formed in the base plate 12, and the first jacking jack 4 and the second jacking jack 6 are respectively arranged in the positioning connecting holes.

[0050] An implementation method of a steel strand replacement continuous tensioning device suitable for a compact working space, comprising the following steps:

[0051] Step one: tensioning device assembly;

[0052] a. Install the support plate, pass the steel strand to be replaced through the support plate, install the single-hole clamping anchor, abut the end face of the single-hole clamping anchor with the end face of the support plate, and tighten the single-hole clamping anchor;

[0053] b. Thread the first adjusting screw and the second adjusting screw through the threaded holes, so that the first adjusting screw and the second adjusting screw are threadedly connected with the support plate;

[0054] c. Intermittently distribute and install the first jacking jack and the second jacking jack outside the anchor plate, adjust the positions of the jacking jacks, so that the first jacking jack and the first adjusting screw correspond one by one and are on the same axis, and the second jacking jack and the second adjusting screw correspond one by one and are on the same axis.

[0055] Step two: hydraulic oil circuit connection;

[0056] Connect the first jacking jack group through each first oil distribution pipe and the first total oil pipe, connect the second jacking jack group through each second oil distribution pipe and the second total oil pipe, and connect to the pump station control system after confluence.

[0057] Step three: tensioning device adjustment preparation

[0058] a. Start the pump station control system, and extend the stroke L1 of each piston of the first jacking jack group and the second jacking jack group;

[0059] b. Rotate the first adjusting screw group, so that the end face of each first adjusting screw abuts against the piston of each first jacking jack;

[0060] c. Rotate the second adjusting screw group, so that the distance between the end face of each second adjusting screw and the piston of each second jacking jack group is L2, and L2 < L1.

[0061] Step four: steel strand replacement operation

[0062] a. Start the pump station control system to control, so that the piston of each first jacking jack continues to extend, pushes the support plate, the support plate drives the single-hole clamping anchor to clamp the steel strand and stretch outward, until the working clamp in the anchor plate is pulled out, and the working clamp is taken out;

[0063] b, start the pump station control system distribution control, slowly release the oil of each first jacking jack, the support plate is close to the first jacking jack, the distance L2 between the second adjusting screw group and the second jacking jack group piston gradually reduces, until the end of the second adjusting screw and the end face of the second jacking jack piston contact. When the pressure value of the pressure sensor arranged in the first adjusting screw is 0, at this time, the tension of the steel strand is converted to be borne on the second jacking jack group through the single-hole clamp anchor and the support plate.

[0064] c, when the pressure value of the pressure sensor arranged in the first adjusting screw is 0, rotate the first adjusting screw group, make the first adjusting screw away from the first jacking jack, and start the pump station control system distribution control again, make the piston of the first jacking jack stroke L1 again, and the distance between the end face of the first adjusting screw and the piston of the first jacking jack is L2, and L2 < L1;

[0065] d, start the pump station control system distribution control, slowly release the oil of the second jacking jack group, the support plate is close to the second jacking jack, the distance L2 between the first adjusting screw and the first jacking jack piston gradually reduces, until the end of the first adjusting screw and the end face of the first jacking jack piston contact. When the pressure value of the pressure sensor arranged in the first adjusting screw is 0, at this time, the tension of the steel strand is converted to be borne on the first jacking jack group through the single-hole clamp anchor and the support plate.

[0066] e, repeat the operations of b, c and d in step four until the tension of the steel strand is completely relaxed;

[0067] f, at this time, the tension release of one of the steel strands of the steel strand cable is completed, and the new steel strand is replaced according to the conventional construction method;

[0068] g, the tensioning of the new steel strand can be completed by the reverse process of the above operation.

[0069] The replacement and tension release of the steel strand do not need to use a through-type jack, which greatly saves the operation space, meets the needs of compact engineering structure, and adapts to the development of engineering construction technology. Through the group control of the first jacking jack group and the second jacking jack group, the continuous tensioning function can be realized. The work efficiency is improved.

[0070] In addition to the above embodiments, the present application also includes other implementation manners, and any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present application.

Claims

1. A steel strand replacement continuous tensioning device suitable for a compact work space, characterized by: The first adjusting screw group and the second adjusting screw group are arranged on the supporting plate, the first jacking jack group and the second jacking jack group are arranged on the outer periphery of the anchor plate, the first adjusting screw group corresponds to the first jacking jack group, the second adjusting screw group corresponds to the second jacking jack group, the first jacking jack group is arranged between the first adjusting screw group and the anchor block, and the second jacking jack group is arranged between the second adjusting screw group and the anchor block; the supporting plate is provided with a threading hole, the steel strand is arranged in the threading hole, the single-hole clamp anchor is arranged on the steel strand, and the single-hole clamp anchor abuts against the end surface of the supporting plate; N thread holes are arranged on the supporting plate in a ring direction and are uniformly distributed, the thread holes correspond to the first adjusting screw group and the second adjusting screw group, and the first adjusting screw group and the second adjusting screw group are respectively connected with the supporting plate in a threaded mode; The first jacking jack group comprises a plurality of first jacking jacks, the second jacking jack group comprises a plurality of second jacking jacks, the first jacking jacks are respectively connected with the first total oil pipe in a communication mode through the first oil distribution pipe, the second jacking jacks are respectively connected with the second total oil pipe in a communication mode through the second oil distribution pipe, and the first total oil pipe and the second total oil pipe are respectively connected with the pump station control system. The anchor plate is provided with a base plate on the outer side, the base plate is provided with a positioning connecting hole, and the first jacking jack and the second jacking jack are arranged in the positioning connecting hole.

2. The steel strand replacement and continuous tensioning device adapted to a compact work space according to claim 1, characterized in that: The N is an arbitrary integer between 4 and 10.

3. The steel strand replacement and continuous tensioning device adapted to a compact work space according to claim 1, characterized in that: The first adjusting screw group comprises a plurality of first adjusting screws, the second adjusting screw group comprises a plurality of second adjusting screws, and the first adjusting screws and the second adjusting screws are arranged in a staggered mode.

4. The steel strand replacement and continuous tensioning device adapted to a compact work space according to claim 3, characterized in that: A pressure sensor is arranged on the bottom of one of the first adjusting screws, the bottom of one of the second adjusting screws and the bottom of the single-hole clamp anchor.

5. The steel strand replacement and continuous tensioning device adapted to a compact work space according to claim 1, characterized in that: The first total oil pipe is provided with a first distribution valve, and the second total oil pipe is provided with a second distribution valve.

6. A method of implementing a compact space-adapted strand replacement continuous tensioning device according to any one of claims 1 to 5, characterized in that: The implementation method comprises the following steps: Step one: tensioning device assembly a. Install the supporting plate, pass the steel strand to be replaced through the supporting plate, install the single-hole clamp anchor, abut the end surface of the single-hole clamp anchor against the end surface of the supporting plate, and tighten the single-hole clamp anchor; b. The first adjusting screw and the second adjusting screw are respectively arranged on the supporting plate and are connected with the supporting plate in a threaded mode; c. The first jacking jack and the second jacking jack are arranged on the outer side of the anchor plate in a staggered mode; Step two: hydraulic oil circuit connection The first jacking jack group is connected with the first total oil pipe, the first jacking jack group is connected with the second total oil pipe, and the first jacking jack group and the second jacking jack group are connected with the pump station control system after being connected in parallel; Step three: tensioning device adjustment preparation a. Start the pump station control system, and extend the stroke L1 of each piston of the first jacking jack group and the second jacking jack group; b. Rotate the first adjusting screw group, so that the end surface of each first adjusting screw abuts against each piston of the first jacking jack group; c. Rotate the second adjusting screw group, so that the end surface of each second adjusting screw is away from each piston of the second jacking jack group by a distance L2, and L2 < L1; Step four: steel strand replacement operation a, start the pump station control system to control the distribution, so that each first jack piston continues to push out, push the support plate, the support plate drives the single hole anchor clamping steel strand to stretch outwards until the working clamp in the anchor plate is pulled out, and the working clamp is taken out; b, start the pump station control system to control the distribution, so that each first jack slowly bleeds, the support plate approaches the first jack, the distance L2 between the second adjusting screw group and the second jack group piston gradually decreases until the second adjusting screw end and the second jack piston end surface contact; c, rotate the first adjusting screw group, so that the first adjusting screw is away from the first jack, and then start the pump station control system to control the distribution again, so that the first jack piston stroke L1 is pushed out again, and the distance between the end surface of the first adjusting screw and the piston of the first jack is L2, and L2 < L1; d, start the pump station control system to control the distribution, so that the second jack group slowly bleeds, the support plate approaches the second jack, the distance L2 between the first adjusting screw and the first jack piston gradually decreases until the first adjusting screw end and the first jack piston end surface contact; e, repeat the operations of b, c and d in step four until the tension of the steel strand is completely relaxed; f, complete the tension release of the steel strand to be replaced, and then replace the new steel strand according to the conventional construction method; g, the tensioning of the new steel strand can be completed by the reverse process of the above operation.

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