Finished cable circumferential prestress tensioning device and tensioning system

Abstract

The utility model discloses a finished cable circumferential prestress tensioning device and a tensioning system. The finished cable circumferential prestress tensioning device comprises a supporting part, a sliding part used for sliding along the supporting part and a tensioning part used for applying tensioning force to the sliding part. The bottom end of the supporting part is used for supporting the tensioning device, the top end of the supporting part is used for installing the fixed end of the tensioning part, the tensioning end of the tensioning part is fixedly connected with the top end of the sliding part, and a tensioning rod is arranged at the bottom end of the sliding part. The bottom end of the tensioning rod is provided with an internal thread section matched with the external thread of the circumferential prestressed tendon, and the top end of the tensioning rod penetrates through the lower wall of the sliding part and is provided with a limiting part clamped with the sliding part. According to the finished cable circumferential prestress tensioning device and the tensioning system, parts assisting in tensioning can be reduced, installation and tensioning of a jack are facilitated, the finished cable circumferential prestress tensioning device and the tensioning system can adapt to circumferential prestress tendons with different reserved lengths, two ends of the finished cable can be tensioned synchronously, and the problem that an anchorage device deflects due to single-end tensioning is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of annular prestress tension technology, especially to a finished cable annular prestress tension device and tension system. BACKGROUND

[0002] There are a large number of prestressed components in bridge structures, such as piers, suspension bridge tower columns, cable-stayed bridge tower columns, etc. Under the action of external load Poisson effect, concrete shrinkage, environmental temperature reduction and construction stage temperature stress, vertical cracking is prone to occur. At present, the cracked components are mainly reinforced by pressure grouting method and passive restraint method, wherein the passive restraint method usually applies annular prestress to the outside of the component. The external annular prestress is mainly applied by the following methods: 1. The direction of the prestressed tendon is changed by a deflector, so that there is enough space to install a tension jack for prestress tension. This method is only suitable for steel strand clipper type anchoring mode and is not suitable for finished anchor cable tensioning; 2. A force applying pedestal is installed, and a tensioning extension cylinder is used to tension the prestressed tendon. This method has the problems of complicated installation of the force applying pedestal and the need to configure tensioning extension cylinders of different lengths according to the size of the prestressed component; 3. A screw and a nut are used to directly apply prestress, and the prestress is applied by manually tightening the nut, which has the disadvantages of unbalanced force value loading and small applied force value. SUMMARY

[0003] In view of the above problems, the utility model provides a finished cable annular prestress tension device and tension system, which aims to solve the problems of the existing tension device not being suitable for finished cable tensioning, the need to install a complicated auxiliary mechanism, and unbalanced force value loading caused by manual tensioning.

[0004] The utility model adopts the following technical scheme to achieve the above-mentioned purpose:

[0005] A finished cable annular prestress tension device for tensioning an annular prestressed tendon with an external thread at the end; the tension device comprises a support part, a sliding part for sliding along the support part, and a tensioning part for applying tension to the sliding part; the bottom end of the support part is used to support the tension device, and the top end is used to install the fixed end of the tensioning part; the tensioning end of the tensioning part is fixedly connected to the top end of the sliding part, and the bottom end of the sliding part is provided with a tension rod; the bottom end of the tension rod is provided with an internal thread section matched with the external thread of the annular prestressed tendon, and the top end penetrates through the lower wall of the sliding part and is provided with a limiting part clamped therewith.

[0006] In the technical solution, the tensioning device is used for tensioning the hoop-shaped prestressed tendon arranged on the to-be-reinforced member, so that the hoop-shaped prestressed tendon reaches a preset force value; and the specific tensioning process is as follows: the hoop-shaped prestressed tendon is arranged on the member to which the prestress is to be applied in a hoop shape, the end portion of the hoop-shaped prestressed tendon penetrates through the corresponding anchor hole on the anchor plate, and the matched anchor device is installed; then the bottom end of the supporting portion is installed on the anchor plate or the prestressed member, the end portion of the prestressed tendon is installed on the internal thread segment of the tensioning rod through the external thread, the tensioning end of the tensioning portion drives the sliding portion to slide upward along the supporting portion, and in the process, the limiting portion of the tensioning rod is clamped with the lower wall of the sliding portion, so that the tensioning rod moves upward, thereby realizing tensioning of the hoop-shaped prestressed tendon, and when the preset force value is reached, the anchor device is locked and the tensioning device is removed.

[0007] In a further technical solution, the number of tensioning rods is two or more.

[0008] In a further technical solution, the top end of the tensioning rod is provided with an external thread segment, and the limiting portion is a limiting nut matched with the external thread segment.

[0009] In a further technical solution, the tensioning rod is further sleeved with a force sensor, and the force sensor is installed between the limiting nut and the lower wall of the sliding portion.

[0010] In a further technical solution, the supporting portion includes two parallel arranged guide rods, a supporting leg respectively fixedly arranged at the bottom end of the two guide rods, and a tensioning beam installed at the top end of the two guide rods; the sliding portion is in sliding connection with the guide rods; the fixed end of the tensioning portion is installed on the tensioning beam, and the tensioning end penetrates through the tensioning beam and is connected with the top end of the sliding portion.

[0011] In a further technical solution, the supporting portion further includes a supporting nut in threaded connection with the guide rod, and the supporting nut is used for supporting the bottom end of the sliding portion.

[0012] Further technical solutions are that the sliding part further comprises a sliding beam provided with a through hole matched with the two guide rods.

[0013] Further technical solutions are that the sliding beam is an I-beam, the tensioning end of the tensioning part is fixedly connected with an upper beam of the I-beam, and a tensioning rod is arranged in a lower beam of the I-beam.

[0014] Further technical solutions are that the tensioning part is a tensioning jack.

[0015] A finished cable ring transverse prestressed tensioning device and a tensioning system, comprising an anchor plate, a transverse prestressed tendon, two tensioning devices, two ends of the transverse prestressed tendon respectively penetrating the anchor plate from both sides, and the two tensioning devices being used for tensioning two ends of the transverse prestressed tendon.

[0016] The utility model discloses the beneficial effects are:

[0017] The utility model provides a kind of finished cable ring transverse prestressed tensioning device and tensioning system, by being provided with tensioning rod with internal thread section in the bottom end of sliding part, the tensioning of prestressed tendon is realized with the movement of sliding part, compared with prior art, it can reduce the parts of auxiliary tensioning, facilitate the installation and tensioning of jack;Again by installing limiting nut on tensioning rod, the position of tensioning rod bottom end internal thread section can be adjusted, adapt to different length of transverse prestressed tendon reserved, avoid the cumbersome installation procedure of tensioning extension cylinder and other auxiliary mechanisms;Tensioning system is provided with two tensioning devices, can be tensioned simultaneously to two ends of finished cable, avoid the problem that anchor tool deflects due to single-end tensioning, improve tensioning efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic view of finished cable first end transverse prestressed tensioning device.

[0019] Figure 2 It is the structure schematic view of support part.

[0020] Figure 3 It is the structure schematic view of sliding part.

[0021] Figure 4 It is the structure schematic view of finished cable second end transverse prestressed tensioning device.

[0022] Figure 5The utility model discloses a structure diagram of the annular prestress tension system.

[0023] In the drawing,

[0024] 11, guide rod; 12, support leg; 13, support nut; 14, tension beam; 21, lower beam; 22, tension rod; 23, internal thread section; 24, limiting nut; 25, force sensor; 26, upper beam; 31, fixed end; 32, tension end; 33, tension nut; 4, annular prestressed tendon; 41, anchoring end external thread; 42, anchorage device; 5, anchor plate; 6, oil pump; 7, pier. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below combining with the drawings Figures 1 to 5 and specific implementation, the following examples and the features in the example can be combined mutually under the condition of no conflict.

[0026] As Figures 1 to 5 shown, the embodiment provides a finished annular prestress tension device for tensioning annular prestressed tendon 4 provided with external thread at the end; the tension device includes support part, sliding part for sliding along the support part, tension part for applying tension force to the sliding part; the bottom end of the support part is used for supporting the tension device, and the top end is used for installing the fixed end 31 of the tension part; the tension end 32 of the tension part is fixedly connected with the top end of the sliding part, and the bottom end of the sliding part is provided with the tension rod 22; the bottom end of the tension rod 22 is provided with the internal thread section 23 matched with the anchoring end external thread 41 of the annular prestressed tendon, and the top end penetrates the lower wall of the sliding part and is provided with the limiting part matched with the lower wall.

[0027] Specifically, the tension part is a tension jack; the support part includes two parallelly arranged guide rods 11, support legs 12 fixedly arranged at the bottom ends of the two guide rods 11 respectively, and a tension beam 14 installed at the top ends of the two guide rods 11; the fixed end 31 of the tension part is installed on the tension beam 14; the sliding part includes an I-shaped sliding beam, the lower beam 21 and the upper beam 26 of the I-shaped sliding beam are respectively provided with through holes matched with the guide rods 11, the tension end 32 of the tension part penetrates the tension beam 14 and is fixedly connected with the upper beam 26, so that the sliding part slides along the guide rods 11 under the action of the tension end 32; the tension rod 22 is arranged in the lower beam 21; wherein the internal thread section 23 of the tension rod 22 is installed with the anchoring end external thread 41 through thread at the bottom end of the lower beam 21; the top end of the tension rod 22 penetrates the lower beam 21 and is provided with an external thread structure; the limiting part is a limiting nut 23 matched with the external thread structure; the limiting nut 23 is clamped with the lower beam 21 above the lower beam 21.

[0028] The specific tensioning process is that the circumferential pre-stressed tendon 4 is circumferentially installed on a component to which pre-stress is required to be applied, such as a pier 7, so that the outer thread 41 of the anchoring end penetrates through the corresponding anchor hole of the anchor plate 5, and the matched anchor 42 is installed, then the support leg 12 is installed on the anchor plate 5, the circumferential pre-stressed tendon 4 is installed on the inner threaded section 23 of the tensioning rod 22 through the outer thread 41 of the anchoring end, the oil pump 6 is started to drive the tensioning end 32 of the tensioning part to drive the sliding part to slide upward along the guide rod 11, and the limiting nut 23 on the tensioning rod 22 is clamped with the upper end surface of the lower beam 21 in the process, so that the tensioning rod 22 moves upward, thereby realizing the tensioning of the circumferential pre-stressed tendon 4, and the anchor 42 is locked and the tensioning device is removed when the preset force value is reached. The tensioning device in the embodiment sets the tensioning rod 22 with the inner threaded section 23 at the bottom end of the sliding part, realizes the tensioning of the circumferential pre-stressed tendon 4 with the movement of the sliding part, can reduce the auxiliary tensioning parts, and is convenient for the installation and tensioning of the tensioning part; the top end of the tensioning rod 22 is clamped with the lower beam 21 through the limiting nut 23, the position of the bottom end of the tensioning rod 22 is adjusted by adjusting the matching position of the limiting nut 23 and the outer threaded section of the tensioning rod 22, the tensioning rod 22 is adapted to circumferential pre-stressed tendons 4 with different reserved lengths, and the cumbersome installation process of the auxiliary mechanism such as the tensioning extension cylinder is avoided; and the sliding part frame with the I-beam structure can further improve the stability of the sliding part.

[0029] The above embodiment exemplarily shows the specific structure of the supporting part, the sliding part and the limiting part, and other structures can be used instead in other embodiments or actual applications, for example: the supporting part can also adopt one or more than three guide rods 11 structures, the support leg 12 can also be installed in cooperation with the component to be reinforced for supporting the tensioning device; the sliding part can also adopt a horizontal I-beam as a sliding beam; and the limiting part can also adopt a limiting structure fixedly connected with the top end of the tensioning rod 22, wherein the size of the limiting structure is greater than the size of the through hole at the bottom end of the sliding part through which the tensioning rod penetrates.

[0030] Another embodiment, on the basis of the above embodiment, the number of tensioning rods 22 is two, which can be applied to the synchronous tensioning of two circumferential pre-stressed tendons 4, and can avoid unbalanced force value loading. In the working condition of more than two circumferential pre-stressed tendons 4, the number of corresponding tensioning rods 22 can be increased to realize synchronous tensioning.

[0031] Another embodiment, on the basis of the above embodiment, the tensioning rod 22 is further sleeved with a force sensor 25, and the force sensor 25 is installed between the limiting nut 23 and the lower beam 21. The force sensor 25 can monitor the cable force value in the tensioning process.

[0032] Another embodiment, on the basis of the above-mentioned embodiment, the support part further comprises a support nut 13 threadedly matched with the guide rod 11, the support nut 13 is used for supporting the bottom end of the sliding part, and specifically used for clamping with the bottom end surface of the support lower beam 21, when tensioned to a preset force value, the support of the support nut 13 to the sliding part can be realized by adjusting the matching position of the support nut 13 and the guide rod 11.

[0033] Still another embodiment, as shown in Figure 5 A finished cable ring prestressed tensioning device and a tensioning system are provided, which comprise an anchor plate 5, a ring prestressed tendon 4, two tensioning devices as described in the above-mentioned embodiments, the two ends of the ring prestressed tendon 4 are respectively penetrated through the anchor plate 5 from two sides, and the two tensioning devices are respectively used for tensioning the two ends of the ring prestressed tendon 4. The tensioning system can synchronously tension the two ends of the finished cable, avoids the problem of anchor deflection caused by single-end tensioning, and improves the tensioning efficiency. In the tensioning system of the embodiment, the pump station 6 can but is not limited to an intelligent tensioning pump station, and can also make the elongation of the two ends of the ring prestressed tendon 4 synchronous while synchronously tensioning the two ends.

[0034] The finished cable ring prestressed tensioning device and the tensioning system provided by the utility model, through setting the tensioning rod 22 with the internal thread section at the bottom end of the sliding part, realize the tensioning of the ring prestressed tendon 4 along with the movement of the sliding part, compared with the prior art, can reduce the auxiliary tensioning parts, and is convenient for the installation and tensioning of the jack; through arranging two or more tensioning rods 22, can simultaneously tension multiple ring prestressed tendons 4, avoid the unbalanced force value loading; through installing the limiting nut 23 on the tensioning rod 22, can adjust the position of the internal thread section at the bottom end of the tensioning rod 22, adapt to the ring prestressed tendons with different reserved lengths, avoid the complicated installation process of the tensioning extension cylinder and other auxiliary mechanisms; the tensioning system is provided with two tensioning devices, can synchronously tension the two ends of the finished cable, avoid the problem of anchor deflection caused by single-end tensioning, and improve the tensioning efficiency.

Claims

1. A finished grommet to pre-stressed tensioning device, characterized in that, Tensioning device for tensioning annular prestressed tendon with external thread at the end The tensioning device comprises a support part, a sliding part for sliding along the support part, and a tensioning part for applying tension to the sliding part The bottom end of the support part is used to support the tensioning device, and the top end is used to mount the fixed end of the tensioning part The tensioning end of the tensioning part is fixedly connected to the top end of the sliding part, and the bottom end of the sliding part is provided with a tensioning rod 2. A finished grommet to pre-stressed tensioning device according to claim 1, characterized in that, The bottom end of the tensioning rod is provided with an internal thread section matched with the external thread of the annular prestressed tendon 3. A finished grommet to pre-stressed tensioning device as claimed in claim 1, wherein, The number of tensioning rods is two or more 4. A finished grommet to pre-stressed tensioning device as claimed in claim 3, wherein, The top end of the tensioning rod is provided with an external thread section, and the limiting part is a limiting nut matched with the external thread section 5. The finished grommet to pre-stressed tensioning device of claim 1, wherein, The tensioning rod is further provided with a force sensor, which is mounted between the limiting nut and the lower wall of the sliding part The support part comprises two parallel guide rods, a support leg fixedly arranged at the bottom end of each guide rod, and a tensioning beam mounted at the top end of each guide rod 6. A finished grommet to pre-stressed tensioning device as claimed in claim 5, wherein, The sliding part is slidingly connected to the guide rods 7. A finished grommet to pre-stressed tensioning device as claimed in claim 5, wherein, The fixed end of the tensioning part is mounted on the tensioning beam, and the tensioning end penetrates the tensioning beam and is connected to the top end of the sliding part 8. A finished grommet to pre-stressed tensioning device as claimed in claim 7, wherein, The support part further comprises a support nut threadedly matched with the guide rods 9. The finished eyelet towards prestressed tensioning device according to claim 1, characterized in that, The support nut is used to support the bottom end of the sliding part 10. A tensioning system characterized in that, The sliding part further comprises a sliding beam provided with through holes matched with the two guide rods The sliding beam is an I-beam, the tensioning end of the tensioning part is fixedly connected to the upper beam of the I-beam, and the tensioning rod is arranged in the lower beam of the I-beam The tensioning part is a tensioning jack The tensioning device comprises an anchor plate, an annular prestressed tendon, and two tensioning devices according to any one of claims 1 to 9 The two ends of the annular prestressed tendon penetrate the anchor plate from both sides respectively, and the two tensioning devices are used to tension the two ends of the annular prestressed tendon respectively

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