CN212925802U

CN212925802U - Horse stool for tensioning prestressed tendons

Info

Publication number: CN212925802U
Application number: CN202021403047.XU
Authority: CN
Inventors: 廖小敏; 肖明钧; 梁忠周
Original assignee: Guizhou Road and Bridge Group Co Ltd
Current assignee: Guizhou Road and Bridge Group Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-04-09
Anticipated expiration: 2030-07-16

Abstract

The utility model provides a split heads is used in prestressing tendons stretch-draw. The device comprises a first support plate, a second support plate and an upright post; the first support plate and the second support plate are annular steel plates with coincident axes, and the plurality of stand columns are uniformly distributed and connected between the first support plate and the second support plate along the circumferential direction of the first support plate or the second support plate; the axis of the upright post is vertical to the panels of the first support plate and the second support plate; the stand is the threaded rod, all be equipped with the screw hole that is used for connecting the stand on backup pad one and the backup pad two. The utility model realizes the supporting function of the split heads to the jack and forms the fastening space of the anchorage device between the adjacent upright columns through the connection of the upright columns between the first supporting plate and the second supporting plate, thereby facilitating the fastening of the anchorage device by the operating personnel; through set up the screw thread on the stand, set up the screw hole that is used for connecting the stand in backup pad one and backup pad two, can realize the regulation of split heads height, be applicable to the stretch-draw of different grade type and the fixed scene of ground tackle.

Description

Horse stool for tensioning prestressed tendons

Technical Field

The utility model relates to a construction technical field, concretely relates to prestressed reinforcement is split heads for stretch-draw.

Background

The continuous rigid frame bridge has the advantages of large spanning capacity, convenience in construction, low manufacturing cost and the like, and is widely applied to bridge engineering, particularly along with the rapid extension of a highway to a mountain area, the high-pier large-span prestressed concrete continuous rigid frame bridge is rapidly developed in China, but in the continuous rigid frame bridge constructed in China in the early stage, the phenomenon of box girder web plate concrete cracking happens occasionally, the reason is very bad, part of rigid frame bridge box girder web plate cracking is caused by the insufficient prestress of vertical prestressed tendon tensioning, the insufficient prestressed tendon is related to a tensioning tool, namely a split heads to a certain extent, an anchor is positioned in the split heads, and the traditional split heads have poor prestressed tensioning effect due to the fact that the space for applying and tensioning the anchor is small, the height adjustability is poor, and the rotation angle of a wrench is limited by the split heads, so that the anchor is not in place.

In conclusion, a split heads for tensioning prestressed tendons is urgently needed to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prestressed reinforcement is split heads for stretch-draw to solve the not enough problem in ground tackle fastening space of current split heads.

In order to achieve the purpose, the utility model provides a split heads for tensioning prestressed tendons, which comprises a first supporting plate, a second supporting plate and a vertical column; the first support plate and the second support plate are annular steel plates with coincident axes, and the plurality of stand columns are uniformly distributed and connected between the first support plate and the second support plate along the circumferential direction of the first support plate or the second support plate; and the axis of the upright post is vertical to the panels of the first support plate and the second support plate.

Preferably, the stand is a threaded rod, and threaded holes for connecting the stand are formed in the first support plate and the second support plate.

Preferably, the first support plate is provided with a first mounting hole for connecting with a jack; and a second mounting hole for connecting with an engineering structural member is formed in the second support plate.

Preferably, one end of each upright post exceeds the side face of the first support plate far away from the second support plate, and the end parts of the plurality of upright posts exceeding the first support plate form an area for accommodating the jack.

Preferably, the thickness of the first support plate and the second support plate is 4-6 cm.

Preferably, the number of the stand columns is 3-6.

Use the technical scheme of the utility model, following beneficial effect has:

(1) the utility model discloses in, connect between backup pad one and backup pad two through the stand, both realized the supporting role of split heads to the jack, formed the fastening space of ground tackle again between adjacent stand, the operating personnel of being convenient for carries out ground tackle fastening.

(2) The utility model discloses in, through set up the screw thread on the stand, set up the screw hole that is used for connecting the stand in backup pad one and backup pad two, can realize the regulation of split heads height (the distance of backup pad one and backup pad two is adjusted promptly), be applicable to the stretch-draw of different grade type and the fixed scene of ground tackle.

(3) The utility model discloses in, through set up respectively in backup pad one and backup pad two with the mounting hole one and the mounting hole two that engineering structure component and jack are connected, prevent that stretch-draw in-process split heads from shifting to it is poor to lead to the stretch-draw effect.

(4) The utility model discloses in, stand one end surpasss backup pad one and keeps away from the side of backup pad two, can carry on spacingly to the jack.

(5) The utility model discloses in, backup pad one and backup pad two are the ring form steel sheet, reducible split heads weight when guaranteeing split heads structural rigidity, and the workman of being convenient for carries, saves the cost of labor.

(6) In the utility model, the upright posts are uniformly distributed between the first support plate and the second support plate, the number of the upright posts is preferably 3-6, so that the operation space for fixing the anchorage device (the rotation angle of the wrench is between 60-120 degrees) can be ensured, the supporting effect of the split heads can be ensured, the defect of insufficient operation space caused by excessive number of the upright posts is prevented, and the anchorage device is inconvenient to fix; the deformation of the split heads in the use process due to the fact that the number of the upright columns is too small is prevented.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural view of a split heads for tensioning prestressed tendons according to the present application;

the device comprises a support plate I, a support plate 1.1, a mounting hole I, a mounting hole II, a mounting hole III and a mounting hole II, wherein the support plate I, the mounting hole I, the mounting.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

Example (b):

referring to fig. 1, the embodiment of a split heads for tensioning prestressed tendons is applied to tensioning the vertical prestressed tendons of a box girder.

A split heads for tensioning prestressed tendons comprises a first support plate 1, a second support plate 2 and an upright post 3; the supporting plate I1 and the supporting plate II 2 are annular steel plates with coincident axes, and the plurality of upright posts 3 are uniformly distributed and connected between the supporting plate I1 and the supporting plate II 2 along the circumferential direction of the supporting plate I1 or the supporting plate II 2; circular through holes for the steel bars to pass through are formed in the first supporting plate 1 and the second supporting plate 2; in the embodiment, the first supporting plate 1 and the second supporting plate 2 are both steel plates with the thickness of 4-6 cm, and the first supporting plate 1 and the second supporting plate 2 can be made of carbon structural steel; the number of the upright posts 3 is 3-6, and the upright posts are uniformly distributed along the circumference of the first support plate 1 or the second support plate 2; in the embodiment, four upright posts 3 are arranged, and a gap formed between the upright posts 3 can facilitate an operator to extend into the wrench fixing anchorage; the axis of the upright post 3 is perpendicular to the panels of the first supporting plate 1 and the second supporting plate 2, so that the steel bars are stressed along the axis direction of the upright post 3 to complete tensioning.

The supporting plate I1 is provided with a mounting hole I1.1 used for being connected with a jack; the second support plate 2 is provided with a second mounting hole 2.1 used for being connected with an engineering structural member (namely, a box girder in the embodiment), and the split heads are fixed by bolts to form connection between the split heads and the box girder and between the split heads and the jack, so that the split heads are prevented from shifting to cause poor tensioning effect during tensioning.

The upright post 3 is a solid threaded rod with the diameter of 3.5-4.8 cm and can be made of carbon steel, in the embodiment, the upright post 3 is a hexagonal-head bolt rod, threaded holes for connecting the upright post 3 are formed in the first support plate 1 and the second support plate 2, and the distance between the first support plate 1 and the second support plate 2 can be adjusted by adjusting the connection positions of the first support plate 1, the second support plate 2 and the upright post 3 so as to adapt to anchorage devices in different environments and different models and expand the application range of the split heads.

One end of the upright post 3 exceeds the side face of the first support plate 1 far away from the second support plate 2; the end parts of the plurality of columns 3, which exceed the first support plate 1, form an area for accommodating a jack, in this embodiment, the hexagonal bolt heads of the columns 3 exceed the side surface (i.e., the top surface of the first support plate 1 in fig. 1) of the first support plate 1, which is far away from the second support plate 2, and the specification of the area surrounded by the four bolt heads is smaller than that of the jack, so that the area can be used for limiting the jack.

The assembling method of the split heads for tensioning the prestressed tendons comprises the following steps:

firstly, respectively manufacturing a first supporting plate 1, a second supporting plate 2 and an upright post 3, drilling threaded holes matched with external threads of the upright post 3 on the first supporting plate 1 and the second supporting plate 2, and enabling the positions of the threaded holes on the first supporting plate 1 and the second supporting plate 2 to correspond one to one; then install first stand 3, screw in backup pad two 2 after the earlier screw in backup pad 1 of stand 3, fixed stand 3 rotates backup pad 1, adjusts the distance between backup pad 1 and the backup pad two 2, reaches to set for the distance and when backup pad 1 aligns with the screw hole position on the backup pad two 2 one by one, keeps backup pad 1 and backup pad two 2 fixed, and the remaining stand 3 of screw in can accomplish the split heads assembly.

The working process of the split heads for tensioning the prestressed tendons comprises the following steps: the vertical steel bars to be tensioned penetrate through the through holes of the second supporting plate 2 and the second supporting plate 2 is connected with the box girder through the second mounting holes 2.1, then the penetrating tensioning jack is mounted on the first supporting plate 1 of the split heads and connected with the vertical prestressed tendons of the box girder to tension the prestressed tendons, a triangular operation area is formed between every two columns 3 and between the vertical prestressed tendons on a plane after the split heads are mounted in place, the screwing wrench can perform screwing between every two columns 3 according to the plane position of the anchorage device to realize anchorage of the anchorage device, in the embodiment, the angle of the handle of the screwing wrench which can swing back and forth between the two columns 3 is close to 90 degrees, the operation space is large, the visual effect is good, and the operation and observation are convenient. This device simple structure and weight are lighter, the prestressing tendons stretch-draw of this embodiment is with split heads quality is 45kg, the back is accomplished in the single vertical prestressing tendons stretch-draw, only need carry to next bunch of prestressing tendons position by one man and stretch-draw, and the quality of traditional split heads is about 70kg, the prestressing tendons stretch-draw of this embodiment is with split heads quality lighter than traditional split heads quality 25kg, can practice thrift a workman during the transport, the handling is accomplished by the manual work, do not need other equipment to be supplementary, realize quick installation, shift, repeated turnover utilizes, economic benefits is showing, use a stretch-draw 130m continuous rigid frame bridge as the example, 1 day worker is practiced thrift to every subsection, 60 day workers will be practiced thrift to the full-bridge, every day worker is according to 200 yuan of, 12000 yuan will be practiced thrift to the full-bridge.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A split heads for tensioning prestressed tendons is characterized by comprising a first support plate (1), a second support plate (2) and a stand column (3); the supporting plate I (1) and the supporting plate II (2) are annular steel plates with coincident axes, and the plurality of upright columns (3) are uniformly distributed and connected between the supporting plate I (1) and the supporting plate II (2) along the circumferential direction of the supporting plate I (1) or the supporting plate II (2); and the axis of the upright post (3) is vertical to the panels of the first support plate (1) and the second support plate (2).

2. A split heads for prestressed tendon stretching according to claim 1, characterized in that the upright column (3) is a threaded rod, and the first support plate (1) and the second support plate (2) are provided with threaded holes for connecting the upright column (3).

3. A prestressed tendon tensioning split heads according to claim 1, characterized in that the first supporting plate (1) is provided with a first mounting hole (1.1) for connecting with a jack; and a second mounting hole (2.1) for connecting with an engineering structural member is formed in the second support plate (2).

4. A split heads for prestressing tendons stretching according to claim 1, characterized in that, the one end of the upright column (3) exceeds the side of the first support plate (1) far away from the second support plate (2), and the end of the plurality of upright columns (3) beyond the first support plate (1) forms the area for accommodating the jack.

5. The split heads for tensioning the prestressed tendons as claimed in claim 1, wherein the thickness of the first supporting plate (1) and the second supporting plate (2) is 4-6 cm.

6. A split heads for prestressed tendon stretching according to claim 5, characterized in that the number of said columns (3) is 3-6.