阅读说明：本技术 一种无粘结预应力钢绞线在钢筋结构中的定位方法 (Method for positioning unbonded prestressed steel strand in steel bar structure ) 是由 刘传勇 方国刚 应俊烽 宁连章 王伟 胥艳波 王乾 颜鲁 苏红 周家兴 蒋亮 于 2020-04-20 设计创作，主要内容包括：本发明公开了一种无粘结预应力钢绞线在钢筋结构中的定位方法,其包括,在水平平面以及高程方向上分别布设钢绞线,所述钢绞线的两端通过张拉机具进行张拉锚固,所述钢绞线的两端分别为锚固端和张拉端,其特征在于,包括以下步骤：S1、在所述钢绞线的锚固端和张拉端分别设置若干第一固定装置,固定所述钢绞线的两端部；S2、在所述钢绞线的沿线节段等距设置若干第二固定装置,固定所述钢绞线的长度节段。本发明具有钢绞线定位结构稳定、避免在预应力钢绞线的固定中发生下垂、弯曲的技术效果,可广泛应用于钢绞线定位施工技术领域。(The invention discloses a method for positioning an unbonded prestressed steel strand in a steel bar structure, which comprises the following steps of respectively laying steel strands in a horizontal plane and an elevation direction, carrying out tensioning and anchoring on two ends of each steel strand through a tensioning machine, and respectively arranging an anchoring end and a tensioning end at two ends of each steel strand, and is characterized by comprising the following steps of: s1, arranging a plurality of first fixing devices at the anchoring end and the tensioning end of the steel strand respectively, and fixing two end parts of the steel strand; and S2, arranging a plurality of second fixing devices at equal intervals along the steel strand, and fixing the length sections of the steel strand. The steel strand positioning structure has the technical effects of being stable in steel strand positioning structure and avoiding sagging and bending in the fixing process of the prestressed steel strands, and can be widely applied to the technical field of steel strand positioning construction.)

1. The utility model provides a location method of unbonded prestress wire in steel bar structure, wherein in steel bar structure, lay the steel strand wires respectively along horizontal direction and elevation direction, it is right the steel strand wires carry out the stretch-draw anchor, the both ends of steel strand wires are anchor end and stretch-draw end respectively, its characterized in that, location method of unbonded prestress wire in steel bar structure still includes following step:

s1, arranging a plurality of first fixing devices at the anchoring end and the tensioning end of the steel strand respectively, and fixing two end parts of the steel strand in the steel bar structure;

and S2, arranging a plurality of second fixing devices at the middle sections of the steel strands at equal intervals, and fixing the middle sections of the steel strands in the steel bar structure.

2. The method of claim 1, wherein the first fixing devices are fixed to the anchoring ends and the tensioning ends of the steel strands at step S1.

3. The method of claim 1, wherein all of the first means for securing the unbonded prestressed steel strand in the rebar structure are open-ended bars.

4. The method of claim 3, wherein the ends of the anchored and tensioned ends of the steel strand are tied or welded together with the through-length bars.

5. The method of claim 4, wherein one end of the elongated bar is tied or welded to the anchoring end or the tensioning end of the steel strand, and the other end of the elongated bar is provided with a hook hooked in the building structure on the side corresponding to the anchoring end or the tensioning end.

6. The method of claim 1, wherein the second securing means of step S2 includes stirrups and hooks equally spaced along the length of the strand to secure the strand.

7. The method of claim 6, wherein the horizontal wires are fixed by a plurality of stirrups, comprising,

and horizontally arranging a plurality of stirrup bars on the horizontal plane at equal intervals according to a preset direction, and enabling the steel strand to be arranged on the upper surfaces of all the stirrup bars.

8. The method of claim 7, wherein the width of each stirrup is 15-20cm, and the distance between two adjacent stirrups is set to 1-2 m.

9. The method of claim 6, wherein the laying of the steel strands in the elevation direction is secured by a plurality of stirrup or stirrup members, comprising,

and horizontally arranging a plurality of stirrup bars or hooking bars in the elevation direction according to the preset direction at equal intervals, so that the steel strand is arranged on the upper surfaces of all the stirrup bars or the hooking bars, and the part of the steel strand, which is in contact with the stirrup bars or the hooking bars, is welded through a short steel bar.

10. The method of claim 9, wherein the distance between adjacent stirrups or hooking bars is 1-2m, and the length of the hooking bar is 10-20 cm.

Technical Field

The invention relates to the technical field of steel strand positioning construction. More particularly, the present invention relates to a method for positioning unbonded prestressed steel strands in a steel bar structure.

Background

The unbonded prestress means that the prestressed tendon in the prestressed member has no bonding force with concrete, and the tensile force of the prestressed tendon is completely transferred to the member by the anchorage devices at two ends of the member. The concrete method is that after the surface of prestressed tendon is painted with paint and covered with plastic cloth (pipe), it is laid in the supported member form, and the concrete is poured, after the concrete reaches the defined strength, the tensioning anchoring is carried out. It belongs to post-tensioning construction.

The advantages of the unbonded prestress are no need of complex procedures such as pore channel reservation, bar penetration, grouting and the like, simple construction procedure and accelerated construction speed. Meanwhile, the friction force is small, the multi-span curve type is easy to bend, and the method is particularly suitable for large-span single-direction and bidirectional continuous multi-span curve reinforced beam-slab structures and roofs.

Because of post-tensioning construction, the prestressed steel strand is directly arranged in the steel bar structure without a fixed pore passage or a bracket, and under the condition of increasing the length, the prestressed steel strand is easy to bend and droop. Aiming at the problems, corresponding positioning measures and methods can be designed according to different conditions. At present, there are many methods for positioning steel bars in actual construction, but there is no content for unbonded prestressed bars.

Disclosure of Invention

The invention aims to provide a method for positioning an unbonded prestressed steel strand in a steel bar structure, which has the advantages of stable structure, good adaptability and low cost.

To achieve these objects and other advantages and in accordance with the purpose of the invention, a method for positioning an unbonded prestressed steel strand in a steel reinforcement structure is provided, wherein the steel strand is laid in a horizontal direction and a vertical direction in the steel reinforcement structure, the steel strand is tension-anchored, two ends of the steel strand are an anchoring end and a tension end, respectively, and the method for positioning the unbonded prestressed steel strand in the steel reinforcement structure further comprises the following steps:

s1, arranging a plurality of first fixing devices at the anchoring end and the tensioning end of the steel strand respectively, and fixing two end parts of the steel strand in the steel bar structure;

and S2, arranging a plurality of second fixing devices at the middle sections of the steel strands at equal intervals, and fixing the middle sections of the steel strands in the steel bar structure.

Preferably, in the step S1, a plurality of first fixing devices are respectively fixedly disposed on the force-receiving sides of the anchoring end and the tensioning end of the steel strand.

Preferably, all of said first fixing means are through-length ribs.

Preferably, the anchoring end and the end of the tensioning end of the steel strand are bound or welded by the through long rib.

Preferably, one end of the through long rib is bound or welded to the anchoring end or the tensioning end of the steel strand, and the other end of the through long rib is provided with a hook which is hooked in a building structure on the corresponding side of the anchoring end or the tensioning end.

Preferably, the second fixing device in the step S2 includes stirrup bars and hook bars, which are equally spaced on the section along the steel strand to fix the steel strand.

Preferably, the steel strand laid in the horizontal direction is fixed by a plurality of stirrup bars, which include,

and horizontally arranging a plurality of stirrup bars on the horizontal plane at equal intervals according to a preset direction, and enabling the steel strand to be arranged on the upper surfaces of all the stirrup bars.

Preferably, the width of each stirrup is 15-20cm, and the distance between two adjacent stirrups is set to be 1-2 m.

Preferably, the steel strand laid in the elevation direction is fixed by a plurality of stirrup bars or hooking bars, which comprises,

and horizontally arranging a plurality of stirrup bars or hooking bars in the elevation direction according to the preset direction at equal intervals, so that the steel strand is arranged on the upper surfaces of all the stirrup bars or the hooking bars, and the part of the steel strand, which is in contact with the stirrup bars or the hooking bars, is welded through a short steel bar.

Preferably, the distance between two adjacent stirrup or hooking ribs is 1-2m, and the length of the hooking rib is 10-20 cm.

The invention at least comprises the following beneficial effects:

1. stable in structure, among the difference prior art post-tensioned construction method, with the steel strand wires embedded in concrete structure, do not adopt the fixed mode that sets up fixing device at the steel strand wires segment department that corresponds, in this application, all be provided with fixing device through each segment department in the middle of the both ends of steel strand wires and between the both ends, avoid the prestressing force steel strand wires to appear crooked, flagging drawback along with the increase of length in the construction.

2. The operability is strong, and the fixing device can be arranged and installed on the preset track of the installation of the steel strand at equal intervals in advance.

3. The method has good adaptability and is suitable for construction environments of various prestressed reinforced concrete structures.

4. The cost is low, and application prospect is extensive, and through simple fixed knot structure, including stirrup muscle, collude the muscle etc. and support the connected mode such as welding to the steel strand wires, the cost is lower, and economic benefits is good.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural view of an arrangement of steel strands on a horizontal plane in the present invention;

FIG. 2 is a schematic structural view of an arrangement of steel strands in an elevation direction according to the present invention;

the specification reference numbers indicate: 1. steel strand wires, 2, stirrup muscle, 3, collude the muscle, 4, short steel bar.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-2, a method for positioning an unbonded prestressed steel strand 1 in a steel bar structure includes laying the steel strand 1 in a horizontal plane and an elevation direction, respectively, performing tension anchoring at two ends of the steel strand 1 by a tension tool, and performing anchor anchoring and tension anchoring at two ends of the steel strand 1, including the following steps:

s1, arranging a plurality of first fixing devices at the anchoring end and the tensioning end of the steel strand 1 respectively, and fixing two end parts of the steel strand 1;

and S2, arranging a plurality of second fixing devices at equal intervals along the steel strand 1, and fixing the length section of the steel strand 1.

In the technical scheme, two ends of a steel strand 1 are fixed through a tensioning machine, and the tensioning machine bodies at the two ends of the steel strand 1 are provided with first fixing devices in an extending way and fixed in edge steel bar structures at corresponding sides, so that the unbonded prestressed steel strand 1 is ensured not to generate destructive displacement during tensioning, and the construction quality of the whole system is influenced;

the second fixing devices are arranged at the length sections of the steel strands 1 at equal intervals to fix the prestressed steel strands 1, the method can effectively improve the efficiency of arranging and constructing the steel strands 1, avoid the deviation of the stress direction of the steel strands 1, and ensure the accuracy of the straightness and the elevation of the routing.

In another technical solution, in the step S1, the first fixing devices are respectively fixedly disposed on the force-receiving sides of the anchoring end and the tensioning end of the steel strand 1.

In another embodiment, all the first fixing devices are through-length ribs.

In another technical scheme, each through-length rib ties or welds the ends of the anchoring end and the tensioning end of the steel strand 1.

In another technical scheme, one end of each through long rib is bound or welded to the anchoring end and the tensioning end of the steel strand 1, and the other end of each through long rib is provided with a hook and respectively hooked in building structures on the corresponding sides of the anchoring end and the tensioning end.

In the above technical scheme, the hook is arranged to further strengthen the position stability of the two ends of the steel strand 1 and improve the operability of adjusting the position of the steel strand 1.

In another technical solution, the plurality of second fixing devices in step S2 include stirrup 2 and hook 3, which are disposed at equal intervals on the section along the steel strand 1 to fix the steel strand 1.

In another solution, the steel strand 1 laid on the horizontal plane is fixed by a plurality of stirrup bars 2, which comprises,

and horizontally arranging a plurality of stirrup bars 2 on the horizontal plane at equal intervals according to a preset direction, and enabling the steel strand 1 to be arranged on the upper surfaces of all the stirrup bars 2.

In above-mentioned technical scheme, the elevation of steel strand wires 1 is adjusted through stirrup muscle 2, moves towards to adjust through the conventional measure muscle, fixes to a plurality of steel strand wires 1 accessible ligature. To arranging of two-way steel strand wires 1, the accessible staggers from top to bottom and carries out arranging of steel strand wires 1, and the second floor steel strand wires 1 are arranged in the top of the ordinary muscle of first layer, and stirrup muscle 2 staggers each other, and stirrup muscle 2's height is adjusted. The strength of the stirrup 2 needs to meet the bearing requirement, and the width is determined according to the number and the diameter of the steel strands 1.

In another technical scheme, the width of each stirrup 2 is 15-20cm, and the distance between two adjacent stirrups 2 is set to be 1-2 m.

In another technical scheme, the steel strand 1 is laid in the elevation direction and fixed through a plurality of stirrup bars 2 or hooking bars 3, and the method comprises the following steps of,

and horizontally arranging a plurality of stirrup bars 2 or hooking bars 3 in the elevation direction according to the preset direction at equal intervals, so that the steel strand 1 is arranged on the upper surfaces of all the stirrup bars 2 or hooking bars 3, and the part of the steel strand 1 in contact with the stirrup bars 2 or hooking bars 3 is welded through a short steel bar 4.

In another technical scheme, the distance between two adjacent stirrup bars 2 or hook bars 3 is 1-2m, and the length of the hook bar 3 is 10-20 cm.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.