Stay cable tensioning construction control device

Abstract

The utility model discloses a stay cable tensioning construction control device which comprises an anchor cup nut, a supporting foot, a tensioning end anchor cup, a connecting sleeve, a center hole jack, a tensioning rod nut, a tensioning rod and an angle dial. One end of the tensioning rod is connected with the tensioning end anchor cup through the connecting sleeve, the center hole jack penetrates into the other end of the tensioning rod, and the tensioning rod nut is rotationally fixed to the upper end of the center hole jack. An anchor cup nut used for being matched with a tensioning end anchor cup is arranged in the supporting foot, an angle dial is arranged on the upper surface of the anchor cup nut, and the lower end of the tensioning end anchor cup is connected with a stay cable. By adopting a method of converting the length of the pull-out amount into the number of turns and degrees of rotation of the anchor cup nut, the cable force control precision of the stay cable can be greatly improved, the deviation between the actually measured cable force and the theoretical cable force after secondary cable adjustment is reduced, the requirement for fine control of the cable force of the stay cable is met, and the cable force control precision is improved. And finally, the target that the actual finished bridge state of the bridge is wirelessly approximated to the design state is achieved.

Description

Technical Field

[0001] The utility model discloses a stay cable tensioning construction control device, which relates to the technical field of bridge construction. Background Art

[0002] During the construction of a large-span railway cable-stayed bridge, in order to avoid negative reaction forces on the supports during the construction process, all the cables cannot be tensioned to the designed cable force at once during the cantilever erection of the main beam. Therefore, the tensioning of the cable force is divided into the initial tensioning during the cantilever erection period of the main beam and the secondary tension adjustment after the bridge is completed. The initial tensioning of the cable is controlled according to the tensioning force, and the secondary tension adjustment after the bridge is completed is controlled according to the pull-out amount of the cable length.

[0003] At present, for kilometer-level cable-stayed bridges, due to the long length of the cable and the large tensioning force, the commonly used cable force testing methods such as vibration frequency method, magnetic flux method, through-core pressure ring method, and pressure gauge measurement method cannot accurately analyze the cable force after the cable is tensioned, and the force value error is greatly affected by external factors.

[0004] In order to ensure that the bridge line shape and cable tension of the bridge are infinitely close to the design state, the cable tension of the bridge needs to be accurately adjusted after the bridge is completed. The secondary cable tension adjustment after the bridge is completed is controlled according to the cable pull-out amount, so as to ensure that the cable tension deviation is within the 5% range allowed by the specification. However, the existing construction control method usually uses a through-type jack to tension the cable first, and then uses a steel ruler to measure the cable pull-out amount during the tensioning process for control. Due to the poor working environment of the measurement operation in the tower and the influence of the error of the manual steel ruler measurement reading, for cables with large cable tensioning force values ​​(for example, when the cable tensioning force is 9000KN, a 1mm pull-out measurement error will cause a 50kN cable force deviation), this error has a greater impact on the refined control of the cable tensioning force of the cable. Utility Model Content

[0005] In view of the defects in the above-mentioned background technology, the utility model provides a stay cable tensioning construction control device with ingenious structure and reduced measurement error.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a control device for the tensioning construction of a cable, comprising: an anchor cup nut, a support foot, a tensioning end anchor cup, a connecting sleeve, a through-type jack, a tension rod nut, a tension rod and an angle dial;

[0007] One end of the tension rod is connected to the tension end anchor cup through a connecting sleeve, a through-type jack is inserted into the other end of the tension rod, and the tension rod nut is rotatably fixed to the upper end of the through-type jack; an anchor cup nut for cooperating with the tension end anchor cup is provided in the support foot, an angle dial is provided on the upper surface of the anchor cup nut, and a diagonal cable is connected to the lower end of the tension end anchor cup.

[0008] Furthermore, the lower end of the support leg is connected to the anchoring tooth block, and the upper end of the support leg is connected to the through-type jack.

[0009] Furthermore, the tensioning end anchor cup and the connecting sleeve are threadedly connected.

[0010] Furthermore, the thread spacing of the tensioning end anchor cup is 24 mm, and a vertical indicator line is provided on the surface of the tensioning end anchor cup.

[0011] Furthermore, the angle dial is rotatably connected to the anchor cup nut, and the lower surface of the anchor cup nut is in close contact with the anchoring tooth block.

[0012] Furthermore, a threaded hole is provided on the front side of the anchor cup nut, a pentagonal bolt is connected to the inner side of the threaded hole, and the pentagonal bolt is threadedly connected to the threaded hole.

[0013] Beneficial effects: The utility model adds a disc scale line on the surface of the anchor cup nut and a vertical pointer line on the anchor cup at the tensioning end, adopts the method of converting the pull-out length into the number of rotation circles and degrees of the anchor cup nut, and measures and controls the manual rotation angle during the tensioning process. Compared with the method of manually measuring the length change with a steel ruler, the human reading error has less impact, is easier to control, and has higher accuracy. It can greatly improve the cable force control accuracy during the tensioning process of the inclined cable, reduce the deviation between the measured cable force and the theoretical cable force after the secondary cable adjustment, realize the requirements of refined control of the cable force, and finally achieve the goal of making the actual bridge state wirelessly close to the design state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the external structure of the utility model;

[0015] Figure 2 A schematic cross-sectional view of the utility model;

[0016] Figure 3 A schematic diagram of the local structure of the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the implementation of the technical solution in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0018] like Figures 1 to 3 An embodiment shown is a control device for the construction of a cable tensioning, comprising: an anchor cup nut 1, a support leg 2, a tensioning end anchor cup 3, a connecting sleeve 4, a through-type jack 5, a tension rod nut 6, a tension rod 7 and an angle dial 9;

[0019] One end of the tension rod 7 is connected to the tension end anchor cup 3 through a connecting sleeve 4, a through-type jack 5 is inserted into the other end of the tension rod 7, and the tension rod nut 6 is rotatably fixed to the upper end of the through-type jack 5; an anchor cup nut 1 for cooperating with the tension end anchor cup 3 is provided in the support foot 2, an angle dial 9 is provided on the upper surface of the anchor cup nut 1, and a diagonal cable is connected to the lower end of the tension end anchor cup 3.

[0020] The lower end of the support leg 2 is connected to an anchoring tooth block, and the upper end of the support leg 2 is connected to a through-type jack 5 .

[0021] The tensioning end anchor cup 3 and the connecting sleeve 4 are threadedly connected.

[0022] The thread spacing of the tensioning end anchor cup 3 is 24 mm. A vertical indicator line 8 is provided on the surface of the tensioning end anchor cup 3. The rotation angle of 1 mm pulled out is converted to 1 / 24×360°=15°. For example, if the tensioning end anchor cup 3 is pulled out 1 mm, it can be converted into 15° rotation of the anchor cup nut 1 through the above conversion. The rotation angle of 15° is easier to control than measuring the 1 mm pull-out amount with a steel ruler, with smaller deviation and higher accuracy.

[0023] The angle scale plate 9 is rotatably connected to the anchor cup nut 1, and the lower surface of the anchor cup nut 1 is in close contact with the anchor tooth block.

[0024] A threaded hole 10 is formed on the front side of the anchor cup nut 1 , and a pentagonal bolt 11 is connected to the inner side of the threaded hole 10 . The pentagonal bolt 11 is threadedly connected to the threaded hole 10 .

[0025] The control method of the stay cable tensioning construction control device of this embodiment specifically includes:

[0026] Step 1: Determine the adjustment amount of the cable this time according to the actual cable number pull-out length provided by the bridge construction monitoring unit or the design unit; the pull-out sign is expressed as positive for pulling out the cable and negative for tensioning. Convert the pull-out length of the cable into the number of rotations and degrees, which is the pull-out amount / anchor cup thread spacing (for example, when the monitoring instruction requires that the pull-out amount of a certain cable number is 48mm during cable adjustment, the anchor cup nut 1 rotates 2 turns clockwise on the anchor cup 3 at the tensioning end; when the pull-out amount is 50mm, the anchor cup nut 1 rotates 2 turns 30° clockwise on the anchor cup 3 at the tensioning end);

[0027] Step 2: Before tensioning, the anchor cup nut 1 has anchored the inclined cable, the support leg 2 is placed on the anchor tooth block, the tension rod 7 is connected to the tension end anchor cup 3 through the connecting sleeve 4, and then the through-type jack 5 is inserted into the tension rod 7, and the tension rod nut 6 is rotated and fixed behind the through-type jack 5, and then the angle dial 9 is rotated until its 0 degree scale line is aligned with the indicator line 8 on the tension end anchor cup 3, and then the pentagonal bolt 11 in the threaded hole 10 is tightened so that the end of the pentagonal bolt 11 can press against the angle dial 9 to prevent the angle dial 9 from rotating, and the calibration of the initial position is completed;

[0028] Step 3: Make preparations for the secondary cable elongation observation before cable adjustment;

[0029] Step 4: According to the operation instructions, the construction workers start the through-type jack 5, apply the tension force to the tension rod nut 6 to tension the inclined cable, and control the through-type jack 5 to adjust the cable force through the oil inlet or oil return of the electric oil pump. First, add oil to pull the inclined cable so that the anchor cup nut 1 is not stressed. The operator can loosen the anchor cup nut 1, and rotate the anchor cup nut 1 according to the number of rotations and degrees converted from the pull-out amount (clockwise rotation of the anchor cup nut increases the pull-out cable force, and counterclockwise rotation reduces the tension cable force), and keep a record. After the anchor cup nut 1 is rotated into place, the oil can be returned through the electric oil pump to unload the through-type jack 5, and the force system is converted to anchoring with load by the anchor cup nut 1.

[0030] The utility model adds a disc scale line on the surface of the anchor cup nut and makes a vertical pointer line on the anchor cup at the tensioning end, adopts a method of converting the pulled-out length into the number of rotation circles and degrees of the anchor cup nut, and measures and controls the manual rotation angle during the tensioning process. Compared with the method of manually measuring the length change with a steel ruler, the human reading error has less influence, is easier to control, and has higher accuracy. It can greatly improve the cable force control accuracy during the tensioning process of the inclined cable, reduce the deviation between the measured cable force and the theoretical cable force after the secondary cable adjustment, meet the requirements of fine control of the cable force, and finally achieve the goal of wirelessly approaching the actual bridge state to the design state.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A control device for the construction of a stay cable tensioning, characterized in that: include: Anchor cup nut (1), support foot (2), tension end anchor cup (3), connecting sleeve (4), through-type jack (5), tension rod nut (6), tension rod (7) and angle dial (9); One end of the tension rod (7) is connected to the tension end anchor cup (3) through a connecting sleeve (4); a through-type jack (5) is inserted into the other end of the tension rod (7), and the tension rod nut (6) is rotatably fixed to the upper end of the through-type jack (5); an anchor cup nut (1) for cooperating with the tension end anchor cup (3) is arranged in the support foot (2); an angle dial (9) is arranged on the upper surface of the anchor cup nut (1); and a diagonal cable is connected to the lower end of the tension end anchor cup (3).

2. The stay cable tensioning construction control device according to claim 1, characterized in that: The lower end of the support leg (2) is connected to an anchoring tooth block, and the upper end of the support leg (2) is connected to a through-type jack (5).

3. The stay cable tensioning construction control device according to claim 1, characterized in that: The tensioning end anchor cup (3) and the connecting sleeve (4) are threadedly connected.

4. The stay cable tensioning construction control device according to claim 3, characterized in that: The thread spacing of the tensioning end anchor cup (3) is 24 mm, and a vertical indicator line (8) is provided on the surface of the tensioning end anchor cup (3).

5. The stay cable tensioning construction control device according to claim 1, characterized in that: The angle scale plate (9) is rotatably connected to the anchor cup nut (1), and the lower surface of the anchor cup nut (1) is in close contact with the anchor tooth block.

6. The stay cable tensioning construction control device according to claim 5, characterized in that: A threaded hole (10) is provided on the front side of the anchor cup nut (1), a pentagonal bolt (11) is connected to the inner side of the threaded hole (10), and the pentagonal bolt (11) is threadedly connected to the threaded hole (10).

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