CN215907447U

CN215907447U - Prestressed reinforcement reinforcing and lengthening device

Info

Publication number: CN215907447U
Application number: CN202122341768.3U
Authority: CN
Inventors: 马荣增; 汪洋; 高磊; 王汝程; 王春海; 叶春晓
Original assignee: Cccc Kunming Construction Co ltd
Current assignee: China Communications Second Navigation Bureau Kunming Construction Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-02-25
Anticipated expiration: 2031-09-26

Abstract

The utility model provides a prestressed tendon tensioning and lengthening device which comprises a supporting device and a connector, wherein the connector is used for lengthening a prestressed steel strand, the connector is arranged in the supporting device, the supporting device comprises an annular sleeve plate and a top plate, the sleeve plate and the top plate are connected through a plurality of supporting rods, a plurality of threading holes are formed in the top plate, the connector comprises at least two sleeves, the two sleeves are connected through a connecting bolt, a jacket consisting of at least two clamping pieces is arranged in each sleeve, and the jacket is sleeved with the sleeves. The wire-passing steel strand connector can connect the short prestressed end to the long prestressed tendon to solve the problem that the prestressed tendon is too short and can not be tensioned, and the anchor backing plate combination device with the round hole solves the problem of positioning and tensioning of a hydraulic jack system. Pass the clear reliable of power route, guarantee the firm back of splint, connect long the effectual short prestressed steel strand wires of line connector, guarantee the high efficiency that the constructional device passed power.

Description

Prestressed reinforcement reinforcing and lengthening device

Technical Field

The utility model relates to the field of tendon reinforcing and lengthening, in particular to a prestressed tendon reinforcing and lengthening device.

Background

At present, the prestressed concrete structure has the advantages of safety, reliability, material saving, smaller self weight, good crack resistance, high rigidity and the like, and is widely applied to the fields of industrial and civil buildings and bridges. The loss of prestress is a problem that occurs frequently in the application process of prestressed concrete structures, and it can affect the use quality, durability and safety of the engineering structure. The sliding loss, the instant elastic compression loss and the pipeline friction resistance loss of the prestressed tendons and the anchorage devices can be complemented by the overstretching and the load holding time of the prestressed tendons, but the prestressed loss caused by the shrinkage creep and the elastic compression of the concrete is a long-term and slow process which is related to the construction period of the bridge, after some prestressed tendons are tensioned strictly according to the tensioning process, although the control stress under the prestressed tendon anchor meets the design requirement, the prestressed tendons with cut ends have insufficient stress due to the shrinkage creep and the elastic compression of the concrete after the bridge is formed. In recent years, some methods for reinforcing prestressed tendons have appeared, for example, a support nut is added outside a traditional anchor cup, and the stress level after reinforcing tension is maintained by reinforcing tension and screwing the support nut. The method needs to manufacture the anchorage device with the supporting nut, and the cost is higher. The device also adopts the spacer with the gap to prevent the prestressed tendon from retracting, and has the defects that the device must be matched with spacers with various thicknesses for use, and the anchoring precision is difficult to control. Therefore, the safe, applicable, economic and efficient prestress tensioning tool and method can be found to effectively solve the problem of insufficient tensioning of part of prestressed tendons.

Chinese patent CN212376149U provides a connector for connecting unbonded prestressed steel strands in post-cast strip. The connector includes: the first anchor plate is arranged on one side of the post-cast strip and applies a tensile force in a first direction to the first end steel strand, and the first anchor plate is fixedly connected with the first end steel strand in the post-cast strip; the second anchor ring is fixedly connected with a second end steel strand in the post-cast strip and applies a tensioning force in a second direction to the second end steel strand; and two ends of the first anchor plate and the second anchor ring are respectively fixedly connected with the connecting structure. This connection only plays a role of connecting the steel strands, but does not play a role of tensioning the steel strands.

Chinese patent CN201024591Y, a device for supplementing a tensioning brace, comprising an anchor backing plate, a clip-type anchorage device, a tensioning jack, a brace on the prestressed reinforcement between the tensioning jack and the anchor backing plate, the clip-type anchorage device being arranged in the inner hole of the brace near one end of the anchor backing plate, and a slot for inserting a plurality of gaskets being opened at one end of the contact surface of the brace and the anchor backing plate. The device can realize reducing the anchor prestressing loss of single prestressing tendons, improves prestressing force structure's anchor efficiency in the engineering greatly, and its simple structure, the cost is low, convenient operation, excellent in use effect, but wide application in single medium and short prestressed tendons's in the building engineering anchor. The method needs to manufacture the anchorage device with the supporting nut, and the cost is higher. The device also adopts the spacer with the gap to prevent the prestressed tendon from retracting, and has the defects that the device must be matched with spacers with various thicknesses for use, and the anchoring precision is difficult to control.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a prestressed tendon tensioning and lengthening device, which solves the problem of insufficient tensioning of prestressed tendons or prestress loss after bridging in the existing concrete bridge construction process.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides a prestressing tendons is mended and is stretched and connect long device, includes strutting arrangement and connector, and the connector is used for prestressing force steel strand wires to lengthen, and the connector is established inside strutting arrangement, and strutting arrangement includes annular lagging and roof, connects through a plurality of bracing pieces between lagging and the roof, is equipped with a plurality of through wires holes on the roof, and the connector includes two at least sleeves, and two sleeves pass through connecting bolt and connect, and the sleeve is inside to be equipped with the clamp cover that two at least clamping pieces are constituteed, presss from both sides the cover and cup joints with the sleeve.

In the preferred scheme, the annular sleeve plate is used for being sleeved on the anchor backing plate, and the section of the sleeve plate is abutted against the anchor seat.

In the preferred scheme, the sleeve includes front end sleeve and rear end sleeve, and the inside second that is equipped with of front end sleeve presss from both sides the cover, and the inside third that is equipped with of rear end sleeve presss from both sides the cover.

In the preferred scheme, a gap is arranged between the clamping sleeves formed by the two clamping pieces, each clamping sleeve is of a conical structure, a conical hole is formed in the sleeve, and the conical clamping sleeves are arranged in the conical holes.

In a preferable scheme, a second spring is arranged between the end part of the connecting bolt and the third jacket.

Preferably, the end of the rear sleeve is further provided with a first spring.

In the preferred scheme, the clamping piece internal surface of pressing from both sides the cover is equipped with skid-proof arch, and the inside terminal surface of clamping piece is equipped with bellied tight bulge loop of clamp.

The utility model provides a prestressed tendon tension-supplementing and lengthening device, wherein a wire-passing steel strand connector can connect a short prestressed end to a long prestressed tendon to solve the problem that the prestressed tendon cannot be tensioned due to too short prestressed tendon, and an anchor backing plate combination device with a round hole solves the problem of positioning and tensioning of a hydraulic jack system. The force transmission path is clear and reliable, and after the clamping piece is ensured to be firm, the short prestressed steel strand is effectively lengthened through the wire connector, so that the force transmission efficiency of the structural device is ensured; the utility model has the characteristics of safety, applicability, economy and high efficiency, and has remarkable economic value and social benefit in prestressing force compensation, particularly short prestressing force compensation.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a general main view structure of the extension and extension construction of the present invention;

FIG. 2 is a side view structural diagram of the extension-compensating construction of the present invention;

FIG. 3 is a sectional structure view of the extension-lengthening construction of the utility model;

FIG. 4 is a view of the support assembly of the present invention;

FIG. 5 is a disassembled view of the connector of the present invention;

FIG. 6 is a view of the clip construction of the present invention;

in the figure: sealing an anchor port 1; tensioning the jack 2; a support device 3; a strap 301; a top plate 302; a support bar 303; a threading hole 304; a connector 4; a front end sleeve 401; a second jacket 402; a connecting bolt 403; a second spring 404; a third jacket 405; a rear end sleeve 406; a clamping collar 407; an anchor block 5; an anchor backing plate 6; a first spring 7; a first jacket 8; prestressed steel strands 9; a steel cable 10 is connected.

Detailed Description

As shown in fig. 1-6, a prestressed tendon tensioning and lengthening device, includes strutting arrangement 3 and connector 4, connector 4 is used for prestressed steel strand 9 to lengthen, connector 4 establishes inside strutting arrangement 3, strutting arrangement 3 includes annular lagging 301 and roof 302, connect through a plurality of bracing pieces 303 between lagging 301 and the roof 302, be equipped with a plurality of through wires holes 304 on the roof 302, connector 4 includes two at least sleeves, two sleeves pass through connecting bolt 403 to be connected, the inside jacket that constitutes of two at least clamping pieces that is equipped with of sleeve, the jacket cup joints with the sleeve. The annular sleeve plate 301 is used for being sleeved on the anchor backing plate 6, and the section of the sleeve plate 301 is abutted against the anchor seat 5. The connector 4 plays a role of lengthening the prestressed steel strand 9, and the supporting device 3 plays a role of providing a supporting platform for the tensioning jack 2 to push.

In a preferred scheme, the sleeve comprises a front end sleeve 401 and a rear end sleeve 406, wherein a second jacket 402 is arranged inside the front end sleeve 401, and a third jacket 405 is arranged inside the rear end sleeve 406. A gap is arranged between the clamping sleeves formed by the two clamping pieces, each clamping sleeve is of a conical structure, a conical hole is formed in the sleeve, and each conical clamping sleeve is arranged in the corresponding conical hole. The front sleeve 401 and the rear sleeve 406 are assembled to form a second jacket 402 and a third jacket 405, which ensure a more stable structure when tensioned.

Preferably, a second spring 404 is arranged between the end of the connecting bolt 403 and the third jacket 405. The second spring 404 acts to push against the third collet 405, preventing loss of prestress after the bridge is present.

Preferably, the end of the rear sleeve 406 is further provided with a first spring 7. One end of the first spring 7 abuts against the first jacket 8, and the other end abuts against the rear end sleeve 406, so that the first jacket 8 is pushed, and the third jacket 405 is sleeved on the prestressed steel strand 9.

In the preferred scheme, the clip internal surface of clamp cover is equipped with skid-proof arch, and the inside terminal surface of clip is equipped with bellied tight bulge loop 407 of clamp. The raised clamping convex ring 407 plays a role in clamping the prestressed steel strand 9, and plays a role in increasing friction.

The construction method comprises the following steps: chiseling the seal anchor of the prestressed concrete bridge toothed plate seal anchor mouth 1, passing the prestressed steel strand 9 through a first spring 7 and a rear end sleeve 406, wherein one end of the first spring 7 is abutted against a first jacket 8, the other end is abutted against the rear end sleeve 406, the function of pushing the first jacket 8 is realized, sheathing a third jacket 405 on the prestressed steel strand 9, sheathing the third jacket 405 on the rear end sleeve 406, mounting a second spring 404 on the third jacket 405, rotating a connecting bolt 403, clamping the second spring 404 inside the rear end sleeve 406 by the third jacket 405, passing the connecting steel cable 10 through the front end sleeve 401 and the second jacket 402, mounting the front end sleeve 401 on the connecting bolt 403, mounting a supporting device 3 after the connector 4 is lengthened with the steel strand, passing a sleeve plate 301 of the supporting device 3 through the connector 4 and sheathing an anchor backing plate 6, abutting against an anchor base 5, passing the connecting steel cable 10 through a threading hole 304 and connecting with a tensioning jack 2, and starting tensioning, and detaching the connector 4 and the supporting device 3 after tensioning to perform next tensioning.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.

Claims

1. The utility model provides a prestressing tendons mends a extension device which characterized by: including strutting arrangement (3) and connector (4), connector (4) are used for prestressing force steel strand wires (9) to lengthen, establish inside strutting arrangement (3) connector (4), strutting arrangement (3) are including annular lagging (301) and roof (302), connect through a plurality of bracing pieces (303) between lagging (301) and roof (302), be equipped with a plurality of through wires holes (304) on roof (302), connector (4) include two at least sleeves, two sleeves pass through connecting bolt (403) and connect, the inside jacket that is equipped with two at least clamping pieces and constitutes of sleeve, the jacket cup joints with the sleeve.

2. The tendon tensioning and lengthening device of claim 1, which is characterized in that: the annular sleeve plate (301) is used for being sleeved on the anchor backing plate (6), and the section of the sleeve plate (301) abuts against the anchor seat (5).

3. The tendon tensioning and lengthening device of claim 1, which is characterized in that: the sleeve includes front end sleeve (401) and rear end sleeve (406), and front end sleeve (401) is inside to be equipped with the second and to press from both sides cover (402), and rear end sleeve (406) is inside to be equipped with third and to press from both sides cover (405).

4. The tendon tensioning and lengthening device of claim 1, which is characterized in that: a gap is arranged between the clamping sleeves formed by the two clamping pieces, each clamping sleeve is of a conical structure, a conical hole is formed in the sleeve, and each conical clamping sleeve is arranged in the corresponding conical hole.

5. The tendon tensioning and lengthening device of claim 3, which is characterized in that: a second spring (404) is arranged between the end part of the connecting bolt (403) and the third jacket (405).

6. The tendon tensioning and lengthening device of claim 3, which is characterized in that: the end part of the rear sleeve (406) is also provided with a first spring (7).

7. The tendon tensioning and lengthening device of claim 3, which is characterized in that: the inner surface of the clamping piece of the clamping sleeve is provided with an anti-skid bulge, and the inner end surface of the clamping piece is provided with a convex clamping convex ring (407).