CN113275480B

CN113275480B - Sleeve for bending reinforcing steel bar

Info

Publication number: CN113275480B
Application number: CN202110538905.4A
Authority: CN
Inventors: 姚志伟; 樊振华; 游祥; 刘雪松; 高宝钦
Original assignee: Baoye Hubei Construction Engineering Group Co ltd
Current assignee: Baoye Hubei Construction Engineering Group Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-05-17
Anticipated expiration: 2041-05-18
Also published as: CN113275480A

Abstract

The invention discloses a sleeve for bending a reinforcing steel bar, which comprises an outer sleeve and an inner sleeve screwed in the outer sleeve, wherein a spring is arranged between the bottom end of the inner sleeve and the bottom end of the outer sleeve. When the reinforcing bar was bent, reinforcing bar bottom and spring inner wall offset, and the spring offsets with the outer tube inner wall, and the atress of bending of reinforcing bar in the cover is shared by interior sleeve pipe and outer tube, does benefit to interior sleeve pipe life's extension, effectively avoids the reinforcing bar secondary in the cover to bend to and, can effectively reduce the predetermined difference of bending angle degree and the actual bending angle degree of reinforcing bar. The invention not only utilizes the expansion function of the spring, but also more importantly utilizes the difference between the inner diameter and the outer diameter of the spring to fill up the difference between the inner diameters of the outer sleeve and the inner sleeve.

Description

Sleeve for bending reinforcing steel bar

Technical Field

The invention relates to the field of buildings, in particular to a bending device for reinforcing steel bars.

Background

During building construction, the reinforcing steel bar needs to be bent, in order to guarantee the bending quality, one section of the bent reinforcing steel bar is inserted into the sleeve, the other section of the bent reinforcing steel bar is exposed, the exposed section is stressed, and the reinforcing steel bar is bent.

The reinforcing bar is bent in batches, and in order to raise the efficiency, the workman need insert the sleeve pipe of state of erectting with straight reinforcing bar fast, makes the top of sleeve pipe be in the position that the reinforcing bar was bent just. Namely, the distance between the bottom end of the steel bar and the bending position of the steel bar is equal to the depth of the sleeve. Thus, the depth of the sleeve needs to be adjusted to accommodate the bending position of the reinforcing steel bar.

The building demand is different, and the reinforcing bar position of bending is different, and in order to make sheathed tube degree of depth can satisfy different positions of bending, prior art's sleeve pipe is formed by outer tube and interior sleeve pipe spiro union. The outer sleeve and the inner sleeve rotate relatively, the total length of the whole sleeve changes, and the depth of the sleeve changes accordingly to adapt to different bending positions of the reinforcing steel bar.

Such a cannula, which can vary in length, presents a drawback: the outer sleeve and the inner sleeve have inner diameter difference. Firstly, with reference to fig. 1 and 2, the diameter of the steel bar inserted into the sleeve is large and close to the inner diameter of the inner sleeve, when the steel bar is bent, the bottom of the steel bar is not in contact with the inner wall of the outer sleeve, the bending stress of the steel bar in the sleeve is directly borne by the inner sleeve, and the inner sleeve acts on the outer sleeve, so that the inner sleeve is easily damaged. Secondly, with reference to fig. 3 and 4, the diameter of the steel bar inserted into the sleeve is small, and there is a gap corresponding to the inner sleeve, when the steel bar is bent, the bottom of the steel bar can be pressed against the inner wall of the outer sleeve, and the bending stress of the steel bar in the sleeve is directly borne by the inner sleeve and the outer sleeve together.

Disclosure of Invention

The technical problems solved by the invention are as follows: the service life of the inner sleeve is prolonged, and meanwhile, the straightness of the part of the steel bar in the sleeve is improved.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a sleeve pipe of reinforcing bar usefulness of bending, includes outer tube, spiro union at the intraductal interior sleeve pipe of outer tube, is equipped with the spring between interior sheathed tube bottom and the intraductal bottom of outer tube.

Above-mentioned technical scheme can eliminate the consequence that outer tube and interior sleeve pipe produced because of the internal diameter is poor, and is first, and the diameter of inserting sheathed tube reinforcing bar is great, is close interior sheathed tube internal diameter, and when the reinforcing bar was bent, reinforcing bar bottom offseted with spring inner wall, and the spring offsets with the outer tube inner wall, and the reinforcing bar atress of bending in the sleeve pipe is shared by interior sleeve pipe and outer tube, does benefit to interior sleeve pipe life's extension. The second, the diameter of inserting sheathed tube reinforcing bar is less, has the clearance that matches with interior sleeve pipe, when the reinforcing bar is bent, the reinforcing bar bottom can support and press on the spring inner wall, so, when no spring can not appear, there is the problem in great clearance between reinforcing bar bottom and the outer sleeve pipe inner wall, can effectively avoid the reinforcing bar secondary of cover intraductal to bend (promptly, improve the straightness accuracy of reinforcing bar at the intraductal portion of cover, avoid the bending as far as possible), and, can effectively reduce the predetermined gap of bending angle degree and actual bending angle degree of reinforcing bar.

The invention not only utilizes the expansion function of the spring, but also more importantly utilizes the difference between the inner diameter and the outer diameter of the spring to fill up the difference between the inner diameters of the outer sleeve and the inner sleeve. In addition, the elasticity of the spring is applied between the bottom end of the inner sleeve and the inner bottom of the outer sleeve, and axial force is applied to the inner sleeve and the outer sleeve, so that a threaded connection structure between the inner sleeve and the outer sleeve can be tightened, the inner sleeve and the outer sleeve are prevented from being rotated relatively in an unintended manner, and the sleeve is guaranteed to have a preset depth. Moreover, the axial elastic force of the spring on the inner sleeve can share the axial force applied to the inner sleeve when the reinforcing steel bar is bent, which is beneficial to protecting the threaded connection structure between the inner sleeve and the outer sleeve.

Drawings

The invention is further described with reference to the accompanying drawings:

FIG. 1 is a schematic view of a thicker rebar being inserted into a prior art sleeve;

FIG. 2 is a schematic view of a thicker rebar being bent in a prior art sleeve;

FIG. 3 is a schematic view of a relatively thin rebar being inserted into a prior art sleeve;

FIG. 4 is a schematic view of a relatively thin rebar being bent within a prior art sleeve;

fig. 5 is a schematic view of a reinforcing bar bending sleeve according to the present invention;

fig. 6 is a schematic view of the rebar being bent within the casing of fig. 5.

The symbols in the figures illustrate:

10. an outer sleeve; 20. an inner sleeve; 30. a spring; 40. and (5) reinforcing steel bars.

Detailed Description

Referring to fig. 5, the sleeve for bending the reinforcing steel bar comprises an outer sleeve 10 and an inner sleeve 20 screwed in the outer sleeve, wherein a spring 30 is arranged between the bottom end of the inner sleeve and the bottom end of the outer sleeve.

The bottom end of the outer sleeve 10 is sealed, and the outer sleeve can be fixed on a base which can be a concrete product or a metal product. The outer sleeve can also be freely movable and can be taken and placed at will, and particularly, the sleeve is used for bending thin reinforcing steel bars, and the bending of the reinforcing steel bars only needs manpower without mechanical force.

The worker adjusts the position of the inner sleeve 20 relative to the outer sleeve 10 according to the position of the steel bar 40 to be bent, so that the distance between the bottom end of the steel bar inserted into the sleeve and the bending position is equal to the distance between the bottom in the outer sleeve and the top end of the inner sleeve 20. During adjustment of the inner sleeve 20 relative to the outer sleeve 10, the spring 30 may expand, or alternatively, contract.

The outer diameter of the spring is equal to the inner diameter of the outer sleeve 10, and the difference between the outer diameter of the spring and the inner diameter of the spring is equal to the difference between the inner diameter of the outer sleeve and the inner diameter of the inner sleeve 20. Thus, the reinforcing bar 40 inserted into the sleeve is actually inserted between the inner sleeve 20 and the spring 30 engaged with the bottom end of the inner sleeve, which is equivalent to being inserted into a cylindrical cavity with a uniform inner diameter.

As shown in FIG. 5, the pitch at the top of the spring 30 is alternatively smaller than the pitch at the middle of the spring, and the pitch at the bottom of the spring is alternatively smaller than the pitch at the middle of the spring. That is, the spring wire of spring top and bottom is intensive, and the spring wire at spring middle part is loose, so, insert the reinforcing bar bottom in the sleeve and can stably contradict with spring 30 bottom inner wall, there is a stable support spring bottom inner wall to the reinforcing bar bottom. The spring wire in the middle of the spring is loose, which is beneficial to the axial displacement between the inner sleeve 20 and the outer sleeve 10 with larger amplitude, so as to adapt to the reinforcing steel bars with different lengths and different bending positions.

A polygonal part can be welded to the outer side wall of the inner sleeve 20, and a wrench can be matched with the polygonal part to rotate the inner sleeve to adjust the length of the sleeve, namely the depth of the sleeve.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description herein, since various changes and modifications can be made in the details of the embodiment and the application range according to the spirit of the present invention.

Claims

1. The utility model provides a sleeve pipe of reinforcing bar usefulness of bending, includes outer tube (10), spiro union at interior sleeve pipe (20) of outer tube, its characterized in that: a spring (30) is arranged between the bottom end of the inner sleeve and the bottom end of the outer sleeve;

the outer diameter of the spring is equal to the inner diameter of the outer sleeve (10), and the difference between the outer diameter of the spring and the inner diameter of the spring is equal to the difference between the inner diameter of the outer sleeve and the inner diameter of the inner sleeve (20).

2. A reinforcing bar bending sleeve according to claim 1, wherein: the pitch of the top of the spring (30) is smaller than the pitch of the middle of the spring, and the pitch of the bottom of the spring is smaller than the pitch of the middle of the spring.