CN109726449B

CN109726449B - Lattice point cross anchoring method suitable for rigid grid material

Info

Publication number: CN109726449B
Application number: CN201811514693.0A
Authority: CN
Inventors: 王博; 闫德俊; 李红; 王征鹏; 吴涛
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2018-12-12
Filing date: 2018-12-12
Publication date: 2022-11-29
Anticipated expiration: 2038-12-12
Also published as: CN109726449A

Abstract

The invention discloses a lattice point crossing anchoring method suitable for a rigid grid-shaped material, which is used for reinforcing a concrete structure and comprises the following specific steps: firstly, respectively cutting off the middle part in the lattice point interval of one or more longitudinal ribs of two pieces of grid-shaped materials; then mutually crossing and splicing the two cut grid-shaped materials between the longitudinal ribs of which the middle parts are cut off, and fixing the grid-shaped materials on the surface of a member or a structure; and finally spraying mortar or concrete to bond the grid-shaped material and the member or the structure into a whole. The longitudinal ribs of the two pieces of grid-shaped materials are cut in the lattice point space to remove the middle part, and then are spliced in a crossed manner to form a whole, so that the two pieces of grid-shaped materials are positioned on the same plane, mortar or concrete is sprayed to fix the grid-shaped materials on the surface of a member or a structure to bear load together, and the problem that the mesh is easy to slide or warp and damage when the mesh is overlapped and anchored is effectively solved. In addition, the method can also be applied to newly built concrete structures.

Description

Lattice point cross anchoring method suitable for rigid grid material

Technical Field

The invention relates to the field of concrete structures and reinforcement thereof, in particular to a lattice point crossing anchoring method for a rigid grid material, which is suitable for concrete structures.

Background

The rigid grid material is common in practical engineering, mainly adopts the rigid reinforcing materials such as reinforcing steel bars and FRP reinforcing steel bars, is mainly used for reinforcing a concrete structure, and adopts the concrete implementation measure that a reinforcing steel bar net sheet or an FRP grid is fixed on the surface of a building structure by spraying mortar or concrete to form a whole, so that the performance of the building structure is improved. In addition, the method can also be applied to newly built concrete structures. Because of simple construction and low cost, the composite material can be widely applied to concrete structures.

In actual engineering, especially in engineering reinforcement of large-scale walls, bridge decks, tunnel linings and the like, the size or construction space of the net pieces is limited, and two net pieces are often connected to form a whole; when reinforcing pier, building structure post, also need form two nettings wholly to form the constraint effect to the primary structure, play the reinforcement effect. The traditional method is to overlap two meshes up and down, and the method has two obvious disadvantages, one is that the overlapped part is easy to slide or warp and damage, and the warping problem is difficult to solve by increasing the overlapping length; and secondly, the net thickness of the mortar or concrete sprayed on the lap joint part is reduced by one net piece thickness relative to other parts, so that cracking damage is easy to occur. In order to achieve reliable anchoring, the thickness of mortar or concrete is often increased, which results in material waste.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a lattice point crossing anchoring method suitable for a rigid grid material, which can improve the anchoring performance of the rigid grid material and effectively solve the problem that a mesh is easy to slide or warp and damage when the traditional overlapping and anchoring is carried out; meanwhile, the material consumption is saved.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme.

A lattice point cross anchoring method suitable for rigid grid-shaped materials comprises the following steps:

step 1, respectively cutting off the middle part in the lattice point interval of one or more longitudinal ribs of two pieces of grid-shaped materials; the longitudinal ribs are ribs in the grid-shaped material and vertical to the anchoring direction;

step 2, mutually crossing and splicing the two cut pieces of grid-shaped materials between the longitudinal ribs of which the middle parts are cut off, and fixing the grid-shaped materials on the surface of a component or a structure;

and 3, bonding the grid-shaped material and the member or the structure into a whole by spraying mortar or concrete to play a role in reinforcement.

The invention is characterized by the following and further improved:

in the step 1, when the middle part in the lattice point interval of one or more longitudinal ribs of two pieces of grid-shaped materials is cut, the cutting width in the lattice point interval of the longitudinal ribs of each piece of grid-shaped material is not smaller than the diameter of the transverse ribs of the other piece of grid-shaped material.

The rib material of the grid material is a steel bar or an FRP rib.

In the step 4, the thickness of the sprayed mortar or concrete is 10-20mm.

Further, in step 4, the mortar is polymer modified mortar, and the concrete is polymer modified concrete.

Prior to securing the mesh material to the surface of the component or structure, the component or structure is subjected to a surface treatment.

Further, the surface treatment is to flatten the surface of the member or structure.

Further, an interfacial agent is applied to the surface of the member or structure prior to securing the mesh-like material to the surface of the member or structure.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts a lattice point crossing anchoring method of rigid grid-shaped materials, after longitudinal ribs of two pieces of grid-shaped materials are internally cut in lattice point intervals and the middle parts are removed, the longitudinal ribs are crossed and spliced to form a whole, so that the two pieces of grid-shaped materials are positioned on the same plane, mortar or concrete is sprayed to fix the grid-shaped materials on the surface of a member or a structure, and the grid-shaped materials bear load together.

The anchoring effect of the anchoring method is mainly borne by the resisting effect of the lattice points and the bonding effect of the rib materials, so that the anchoring performance of the rigid grid-shaped material can be improved, and the problem that meshes are easy to slide or warp and damage when being subjected to overlapping anchoring is effectively solved. On the other hand, the thickness of mortar or concrete coated on the cross anchoring part is the same as that of other parts, so that the material consumption is saved. The method has the advantages of simple structure, little change to the existing structure, obvious effect and good engineering practicability.

Drawings

The invention is described in further detail below with reference to the figures and specific embodiments.

FIG. 1 is a schematic view of an anchoring structure of a conventional rigid grid overlapping anchoring method;

FIG. 2 is a schematic view of the anchoring structure of the lattice-crossing anchoring method for rigid grid materials according to the present invention;

FIG. 3 is a schematic cross-sectional view of a single-cell intersection reinforcement structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of the overall structure of FIG. 3;

FIG. 5 is a schematic top view of the structure of FIG. 3;

FIG. 6 is a schematic cross-sectional view of a dual-lattice intersection reinforcement structure according to another embodiment of the present invention;

FIG. 7 is a schematic structural view of a multi-lattice oblique seam crossing anchor according to another embodiment of the present invention.

In the above fig. 1-7: 1 a concrete column; 2, a grid-shaped material; 3, fixing the device; 4 sprayed mortar or concrete; 5 transverse ribs of a grid-like material; 6 longitudinal ribs of a grid-like material.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic view of a conventional anchoring method for overlapping two mesh sheets one on top of the other, which has a problem that sliding or buckling damage may occur at the overlapping portion, and a problem that crack damage may easily occur because the net thickness of sprayed mortar or concrete at the overlapping portion is reduced by one mesh sheet thickness compared to other portions.

In order to solve the above problems, referring to fig. 2, an embodiment of the present invention provides a lattice point crossing anchoring method, in which after a middle portion of longitudinal ribs of two pieces of grid-shaped materials is cut off in each lattice point interval, the longitudinal ribs are crossed and spliced to form a whole, so that the two pieces of grid-shaped materials are in the same plane, and mortar or concrete is sprayed to fix the grid-shaped materials on the surface of a member or structure, so as to jointly bear a load. The method is suitable for the rigid grid-shaped material, can improve the anchoring performance of the rigid grid-shaped material, and can effectively solve the problem that the mesh is easy to slide or warp and damage when the traditional overlapping and anchoring is carried out; meanwhile, the material consumption can be saved.

Example 1

Referring to fig. 3, the FRP grid is used to reinforce the concrete column, and the method comprises the following steps:

step 1, firstly, respectively cutting off the middle part in each lattice point interval of one longitudinal rib of two FRP grid materials; the width of the cut between the adjacent lattice points of the longitudinal rib of each FRP grid material is not less than the diameter of the transverse rib of the other FRP grid material.

And 2, mutually crossing and splicing the two cut FRP grid materials between the longitudinal ribs with the middle parts cut off to form a whole, namely crossing through a grid point straight seam.

And 3, fixing the spliced FRP grid material to the surface of a member or structure to be reinforced through a fixing device.

And 4, finally, bonding the FRP grid material and the member or the structure to be reinforced into a whole by spraying mortar or concrete, and playing a role in reinforcement as shown in figures 4 and 5. Wherein the spraying thickness is 15mm, the mortar is polymer modified mortar, and the concrete is polymer modified concrete.

In this embodiment, before the construction in step 3, the surface of the concrete column is treated to flatten the surface of the concrete column, so as to increase the contact area between the concrete column and the reinforcing material, and then a layer of interface agent capable of improving the interface bonding property is sprayed on the surface of the flattened concrete column, so as to enhance the bonding effect between the concrete column and the FRP mesh material, thereby improving the anchoring property of the rigid FRP mesh material more effectively.

In this embodiment, the interfacial agent is prepared from dry powder and a base material according to the ratio of 3:1, and stirring. The dry powder comprises the following components in percentage by weight: coarse sand: fine sand =2:2:1, the base material is water: c, milk preparation: 901 glue =2:0.5:0.9; the spraying thickness of the interface agent is 1mm.

Example 2

Referring to fig. 6, the FRP grid is used to reinforce the concrete column, and the method comprises the following steps:

step 1, firstly, respectively cutting off the middle part in each lattice point interval of two longitudinal ribs of two FRP grid materials; the width of the cut between the adjacent lattice points of the longitudinal rib of each FRP grid material is not less than the diameter of the transverse rib of the other FRP grid material.

And 2, mutually crossing and splicing the two cut FRP grid materials between the longitudinal ribs with the middle parts cut off to form a whole, namely crossing through two grid point straight seams.

And 3, fixing the spliced FRP grid material to the surface of the member or structure to be reinforced through a fixing device.

In this embodiment, before the construction in step 3, the surface of the concrete column is treated to flatten the surface of the concrete column, so as to increase the contact area between the concrete column and the reinforcing material, and then a layer of interface agent with a thickness of 2mm is sprayed on the surface of the flattened concrete column, which can improve the interface bonding property, so as to enhance the bonding effect between the concrete column and the FRP grid material, and to improve the anchoring property of the FRP grid material more effectively.

In the above embodiment, the FRP mesh materials after splicing are fixed to the surface of the member or structure to be reinforced by the fixing device, and the fixing mode in the conventional anchoring mode is adopted, so that the FRP mesh materials are simply fixed to the surface of the member or structure to be reinforced, the position of the FRP mesh materials is stabilized, and mortar or concrete can be conveniently sprayed on the surface of the FRP mesh materials subsequently.

It should be noted that the embodiment of the present invention may also adopt a steel mesh to reinforce a concrete column or other members or structures to be reinforced. When the longitudinal ribs of the grid reinforcing material are cut off, the number of the cut-off ribs is mainly determined by the material performance and the requirement of an actual reinforcing mode, and the width of the cut-off ribs is also mainly influenced by the space between the grid points and the size of the rib material; accordingly, the intersection form is also different depending on the cutting method and the number of intersection points.

Referring to fig. 7, fig. 7 is a mode of simultaneously cutting off a plurality of longitudinal ribs and transverse ribs of the grid-shaped materials and enabling two pieces of grid-shaped materials to be spliced in a crossed mode through oblique seams, the splicing mode is more suitable for reinforcing components of a plate-shaped structure, the purpose that two pieces of grid-shaped materials are located on the same plane can be achieved, the anchoring performance is improved, and the problem that the mesh is prone to sliding or warping damage when overlapped and anchored is effectively solved.

Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A lattice point crossing anchoring method suitable for rigid grid-shaped materials is characterized by comprising the following steps:

and 3, bonding the grid material and the member or the structure into a whole by spraying mortar or concrete to play a role in reinforcement.

2. The method as claimed in claim 1, wherein in step 1, the width of the cut in the lattice spacing of the longitudinal ribs of each lattice material is not smaller than the diameter of the transverse ribs of another lattice material.

3. The lattice point crossing anchoring method for the rigid lattice material as claimed in claim 1, wherein the reinforcement material of the lattice material is steel bar or FRP reinforcement.

4. The lattice point crossing anchoring method for rigid grid-like materials as claimed in claim 1, wherein in step 4, the thickness of the sprayed mortar or concrete is 10-20mm.

5. The lattice point crossing anchoring method for the rigid latticed material as claimed in claim 1 or 4, wherein in step 4, the mortar is polymer modified mortar and the concrete is polymer modified concrete.

6. The method as claimed in claim 1, wherein step 2, before the grid material is fixed on the surface of the member or structure, the member or structure is subjected to surface treatment to flatten the surface of the member or structure.

7. The method of claim 6 wherein the interface agent is applied to the surface of the member or structure prior to securing the mesh material to the surface of the member or structure.