阅读说明：本技术 基于砂浆快速置换的砌体结构低干预加固方法 (Masonry structure low-intervention reinforcing method based on rapid mortar replacement ) 是由 朱虹 陆飞 宁旺 李胡兵 冯攀 叶少雄 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种基于砂浆快速置换的砌体结构低干预加固方法,包括步骤为：测量灰缝原有砂浆的强度和饱满度；根据测得的灰缝原有砂浆强度确定合适的水射流器水压,根据测得的砂浆饱满度及需要剔除的深度确定合适的水射流器移动速度,根据剔除顺序及原则确定水射流器移动路径；水射流器对准灰缝原有砂浆；使用水射流剔除灰缝原有砂浆；3D打印头伸入灰缝砂浆剔除后的空隙,“Z”字形填充水泥水凝胶复合材料；灰缝砂浆剔除、嵌补结束,工作设备向前行进。本发明能降低对结构的扰动；被加固构件无需设置支撑体系,简化施工工序,减小人力、物力投入；在不损伤块材的前提下,高效剔除灰缝砂浆；实现基于砂浆快速置换的砌体结构低干预加固。(The invention discloses a masonry structure low-intervention reinforcing method based on rapid mortar replacement, which comprises the following steps: measuring the strength and the plumpness of the original mortar of the mortar joint; determining proper water jet device water pressure according to the measured original mortar strength of the mortar joint, determining proper water jet device moving speed according to the measured mortar plumpness and the depth to be removed, and determining a water jet device moving path according to the removing sequence and principle; the water jet device is aligned with the original mortar of the mortar joint; removing the original mortar of the mortar joint by using water jet; the 3D printing head extends into a gap formed by the removed mortar in the mortar joint, and the cement hydrogel composite material is filled in a Z shape; and after the mortar joint is removed and embedded, the working equipment moves forwards. The invention can reduce the disturbance to the structure; the reinforced member does not need to be provided with a supporting system, so that the construction process is simplified, and the investment of manpower and material resources is reduced; on the premise of not damaging the blocks, the mortar in the mortar joints is removed efficiently; the masonry structure low-intervention reinforcement based on mortar quick replacement is realized.)

1. A masonry structure low-intervention reinforcing method based on mortar quick replacement is characterized by comprising the following steps: the method comprises the following steps:

step 1, measuring the strength and the plumpness of original mortar of an mortar joint;

step 2, determining the water pressure of the water jet device according to the measured original mortar strength of the mortar joint, determining the moving speed of the water jet device according to the measured original mortar plumpness of the mortar joint and the depth to be removed, and determining the moving path of the water jet device according to the mortar joint removing sequence and principle;

step 3, aligning the water jet to the original mortar of the mortar joint;

step 4, forming water jet by a water jet device, removing mortar in the mortar joint by using the water jet device, and forming mortar joint and mortar removal gaps;

and 5, extending the 3D printing head into mortar joint mortar to remove gaps, and printing the filled cement hydrogel composite material in the mortar joint mortar removal gaps in a Z-shaped manner in a 3D manner.

2. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 1, characterized in that: in the step 1, the method for measuring the original mortar strength of the mortar joint comprises the following steps: and removing the mortar joint original mortar by adopting a water jet flow pre-test method, and judging the strength of the mortar joint original mortar according to the condition that the mortar joint original mortar is removed by water jet flow.

3. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 1, characterized in that: in the step 2, the sequence and principle of removing the mortar joints are as follows: dividing a masonry structure to be reinforced into a plurality of mortar replacement areas, wherein each divided mortar replacement area comprises a plurality of horizontal mortar joints and a plurality of vertical mortar joints; in the same mortar replacement area, replacing the vertical mortar joint mortar firstly, and then replacing the horizontal mortar joint mortar; when the original mortar of the vertical or horizontal mortar joint is removed, removing the mortar from top to bottom; all mortar joints of the whole wall body are replaced by single-side mortar at the same side of the wall body.

4. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 3, characterized in that: and in the same mortar replacement area, after removing the original mortar of the previous vertical mortar joint by using water jet, removing the mortar of the next vertical mortar joint, and simultaneously, 3D printing the cement hydrogel filling composite material in the gap removed by the previous vertical mortar joint.

5. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 3, characterized in that: when the original mortar in the vertical mortar joint is of a masonry structure which is not penetrated in the depth direction, the replacement depth of the mortar in the vertical mortar joint is larger than the size of the block in the depth direction; when the original mortar in the vertical mortar joint penetrates through the masonry structure in the depth direction, the replacement depth of the vertical mortar joint mortar is the same as that of the horizontal mortar joint mortar penetrating in the depth direction.

6. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 6, characterized in that: when the original mortar in the horizontal mortar joint penetrates through the masonry structure in the depth direction, the residual depth of the original mortar in the horizontal mortar joint after being removed is about 5 cm.

7. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 3, characterized in that: and (4) simultaneously performing step 4 and step 5 on the same horizontal mortar joint, and keeping the distance between the water jet device and the 3D printing head within 5 centimeters.

8. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 8, characterized in that: a baffle is inserted into a horizontal mortar joint mortar removal gap between the water jet device and the 3D printing head, and the distance between the baffle and the water jet device is kept constant.

9. The mortar rapid replacement based masonry structure low-interference reinforcement method according to claim 1, characterized in that: the 3D printing head and the printing surface form a sharp included angle, the 3D printing head obliquely extends into mortar joint mortar to remove gaps, and the cement hydrogel composite material is printed from the side face.

Technical Field

The invention relates to the technical field of masonry structure reinforcement, in particular to a masonry structure low-intervention reinforcement method based on rapid mortar replacement.

Background

The masonry structure has wide application in China and long history, is one of the main forms of the existing building structure at present, and plays an important role in historical buildings. Due to factors such as long-term overhaul, change of use function, improvement of earthquake fortification standard and the like, a plurality of masonry structures need to be repaired and reinforced. Especially, when reinforcing historical and cultural relic building structures, the authenticity principle, the minimum intervention principle, the identifiability principle and the reversible principle of building protection are considered in the selection of the construction technology. Among them, the mortar replacement method is a common reinforcement means.

The mortar replacement is to replace part of low-strength mortar in the masonry structure with high-performance mortar, so as to achieve the purpose of improving the seismic performance of the masonry structure. The method is mainly suitable for masonry structures with blocks still having enough strength and serious mortar performance degradation, and has the characteristics of not reducing the using area of a house and reducing the disturbance to the structure.

In the existing construction method, the mortar needs to be replaced synchronously in the double-sided replacement of the wall, the interference of the construction process to the indoor space of the wall is large, and the wall has the risk of overturning in the single-sided replacement. A supporting system needs to be arranged on the reinforced member before mortar replacement, a large amount of manpower and material resources are consumed, and the construction difficulty is increased. The mortar joint is usually removed manually, and the block is easily damaged when tools and machinery are used.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a masonry structure low-intervention reinforcing method based on rapid mortar replacement, which removes the original mortar of a mortar joint through a water jet device and embeds the 3D printed cement hydrogel composite material to realize masonry structure low-intervention reinforcing based on rapid mortar replacement.

In order to solve the technical problems, the invention adopts the technical scheme that:

a masonry structure low-interference reinforcing method based on mortar quick replacement comprises the following steps.

Step 1, measuring the strength and the plumpness of the original mortar of the mortar joint.

And 2, determining the water pressure of the water jet device according to the measured original mortar strength of the mortar joint, determining the moving speed of the water jet device according to the measured original mortar plumpness of the mortar joint and the depth to be removed, and determining the moving path of the water jet device according to the mortar joint removing sequence and principle.

And 3, aligning the water jet to the original mortar of the mortar joint.

And 4, forming water jet by using a water jet device, removing mortar in the mortar joint by using the water jet device, and forming mortar joint mortar removing gaps.

And 5, extending the 3D printing head into mortar joint mortar to remove gaps, and printing the filled cement hydrogel composite material in the mortar joint mortar removal gaps in a Z-shaped manner in a 3D manner.

In the step 1, the method for measuring the original mortar strength of the mortar joint comprises the following steps: and removing the mortar joint original mortar by adopting a water jet flow pre-test method, and judging the strength of the mortar joint original mortar according to the condition that the mortar joint original mortar is removed by water jet flow.

In the step 2, the sequence and principle of removing the mortar joints are as follows: dividing a masonry structure to be reinforced into a plurality of mortar replacement areas, wherein each divided mortar replacement area comprises a plurality of horizontal mortar joints and a plurality of vertical mortar joints; in the same mortar replacement area, replacing the vertical mortar joint mortar firstly, and then replacing the horizontal mortar joint mortar; when the original mortar of the vertical or horizontal mortar joint is removed, removing the mortar from top to bottom; all mortar joints of the whole wall body are replaced by single-side mortar at the same side of the wall body.

And in the same mortar replacement area, after removing the original mortar of the previous vertical mortar joint by using water jet, removing the mortar of the next vertical mortar joint, and simultaneously, 3D printing the cement hydrogel filling composite material in the gap removed by the previous vertical mortar joint.

When the original mortar in the vertical mortar joint is of a masonry structure which is not penetrated in the depth direction, the replacement depth of the mortar in the vertical mortar joint is larger than the size of the block in the depth direction; when the original mortar in the vertical mortar joint penetrates through the masonry structure in the depth direction, the replacement depth of the vertical mortar joint mortar is the same as that of the horizontal mortar joint mortar penetrating in the depth direction.

When the original mortar in the horizontal mortar joint penetrates through the masonry structure in the depth direction, the residual depth of the original mortar in the horizontal mortar joint after being removed is about 5 cm.

And (4) simultaneously performing step 4 and step 5 on the same horizontal mortar joint, and keeping the distance between the water jet device and the 3D printing head within 5 centimeters.

A baffle is inserted into a horizontal mortar joint mortar removal gap between the water jet device and the 3D printing head, and the distance between the baffle and the water jet device is kept constant.

The 3D printing head and the printing surface form a sharp included angle, the 3D printing head obliquely extends into mortar joint mortar to remove gaps, and the cement hydrogel composite material is printed from the side face.

The invention has the following beneficial effects:

1. the invention can reduce the disturbance to the structure.

2. According to the invention, the member to be reinforced does not need to be provided with a support system, so that the construction process is simplified, and the investment of manpower and material resources is reduced.

3. On the premise of not damaging the block materials, mortar joint mortar is removed efficiently, and quick mortar replacement and low-intervention reinforcement of the masonry structure are realized.

Drawings

FIG. 1 is a flow chart of a masonry structure low-intervention reinforcing method based on rapid mortar replacement according to the present invention.

Fig. 2 is a schematic view of an initial position of the water jet device in the embodiment.

FIG. 3 is a schematic diagram of vertical mortar joint mortar removal and caulking in the embodiment.

FIG. 4 is a schematic diagram illustrating the completion of mortar removal and caulking of the vertical mortar joints in the embodiment.

FIG. 5 is a schematic diagram showing the completion of the vertical mortar joint mortar replacement in the example.

FIG. 6 is a schematic view of horizontal mortar joint mortar removal and caulking in the embodiment.

FIG. 7 is a schematic diagram showing the completion of mortar replacement in the mortar joint in the example.

FIG. 8 is a schematic diagram of the completion of vertical mortar joint mortar replacement in a single area embodiment of the pseudo-ginseng wall.

FIG. 9 is a schematic view of removing and repairing mortar from horizontal mortar joints in a single area of the wall of Panax notoginseng.

FIG. 10 is a schematic view of mortar replacement completion of mortar joints in a single area of a pseudo-ginseng wall.

Wherein the reference numerals are: 1-block, 2-original mortar, 3-cement hydrogel composite material, 4-water jet device and 5-baffle.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

As shown in FIG. 1, a masonry structure low-interference reinforcement method based on mortar rapid replacement comprises the following steps.

Step 1, measuring the strength and the plumpness of the original mortar of the mortar joint.

The method for measuring the strength of the original mortar 2 of the mortar joint is preferably as follows: and removing the mortar joint original mortar by adopting a water jet flow pre-test method, and judging the strength of the mortar joint original mortar according to the condition that the mortar joint original mortar is removed by water jet flow.

And 2, selecting a plurality of test points of mortar joint mortar of the masonry structure, removing the original mortar condition of the mortar joint through water jet to judge the strength of the original mortar of the mortar joint, determining the water pressure of the water jet device according to the measured average strength of the original mortar of the mortar joint, determining the moving speed of the water jet device according to the measured plumpness of the original mortar of the mortar joint and the depth to be removed, and determining the moving path of the water jet device according to the removing sequence and principle of the mortar joint.

According to the invention, the original mortar in the mortar joint is controlled to be removed and the block material 1 is not damaged through the action area and the moving path of the water jet. The initial position of the water jet device is shown in figure 2.

As shown in fig. 8 to 10, the preferred sequence and principle of removing the mortar joints is:

the masonry structure to be reinforced is divided into a plurality of mortar replacement areas to facilitate construction, each divided area comprises a plurality of horizontal mortar joints and a plurality of vertical mortar joints, and the original mortar strength of the mortar joints is similar. In the same mortar replacement area, the original mortar of the vertical mortar joint is removed first, and then the original mortar of the horizontal mortar joint is removed. And when vertical or horizontal mortar joint mortar is removed, removing the mortar in the sequence from top to bottom. All mortar joints of the whole wall body are replaced by single-side mortar at the same side of the wall body.

In the same mortar replacement area, the original mortar in all the vertical mortar joints is replaced first, and then the original mortar in the horizontal mortar joints is replaced. The reason for this sequence is: stress concentration exists in the vertical mortar joints, the damage of the masonry structure often starts from vertical cracks, and finally, the cracks which are continuously communicated up and down are formed to be the final damage form.

When vertical or horizontal mortar joint mortar is removed, removing the mortar in the sequence from top to bottom to prevent water flow from influencing the components of the cement-water gel composite material; and (3) replacing the same vertical mortar joint or the same horizontal mortar joint by single-sided mortar in a mode of selecting one side with small disturbance according to the field conditions.

And step 3, aligning the water jet 4 to the original mortar of the mortar joint.

And 4, forming water jet by using a water jet device, removing mortar in the mortar joint by using the water jet device, and forming mortar joint mortar removing gaps.

The depth of the mortar joint removed preferably meets the following requirements:

1. when the original mortar in the vertical mortar joint is of a masonry structure which is not penetrated in the depth direction, the replacement depth of the mortar in the vertical mortar joint is larger than the size of the block in the depth direction; when the original mortar in the vertical mortar joint penetrates through the masonry structure in the depth direction, the replacement depth of the vertical mortar joint mortar is the same as that of the horizontal mortar joint mortar penetrating in the depth direction.

2. When the original mortar in the horizontal mortar joint penetrates through the masonry structure in the depth direction, the residual depth of the original mortar in the horizontal mortar joint after being removed is about 5 cm, the specific value needs to be designed according to the indoor decoration condition, and the indoor decoration, the heat insulation layer and the like are not damaged as much as possible.

For example, 240 brick walls (one in one T type, more in one T type and cross type) are all through the brick walls in the depth direction of original mortar of the vertical mortar joints. After the horizontal mortar joint and the vertical mortar joint are replaced, the residual depth of the original mortar after the mortar replacement is about 5 cm.

As shown in fig. 8 and 10, the 370 brick wall has the original mortar in the horizontal mortar joint penetrating through the brick wall in the depth direction, and the original mortar in the vertical mortar joint does not penetrate through the brick wall. After the horizontal mortar joint mortar is replaced, the residual depth of the original mortar after the mortar is replaced is about 5 cm, and the replacement depth of the vertical mortar joint mortar is slightly larger than the size of the block material 1 in the depth direction.

And 5, extending the 3D printing head into the mortar joint mortar to remove gaps, and printing the filled cement hydrogel composite material 3 in the mortar joint mortar removal gaps in a Z-shaped manner in a 3D manner.

The cement hydrogel composite material is quick to set, the tensile property is improved compared with that of common mortar, the bonding property is good, and the durability is good.

The 3D printing head and the printing surface form an acute included angle, the initial value is changed according to the distance between the machine and the wall, the initial value is changed along with the construction process of the filling material, and the distance between the machine and the wall needs to be determined according to the working condition. Obliquely extending into mortar joint to eliminate gaps, and printing the cement hydrogel composite material from the side. Because mortar at the mortar joints is removed by adopting water jet, the surface does not need to be sprayed with water for wetting before the cement hydrogel composite material is filled.

When the cement hydrogel composite material is filled by 3D printing, the following requirements are generally met:

A. in the same mortar replacement area, when the previous vertical mortar joint is completely removed by using the water jet, and the next vertical mortar joint is prepared to be removed, 3D printing of the cement hydrogel filling composite material in the gap is removed from the previous vertical mortar joint. The vertical mortar joint is removed and embedded as shown in fig. 3 and 4, and the state after replacement is shown in fig. 5. The horizontal mortar joint is removed and embedded as shown in figure 6.

B. As shown in fig. 6, step 4 and step 5 are performed simultaneously on the same horizontal mortar joint, and on the premise that the operation is not affected, the distance between the water jet device and the 3D printing head (i.e., the gap between the original mortar and the cement hydrogel composite material) is kept at a minimum distance, which is generally not more than 5 cm.

Further, a baffle 5 is inserted into a horizontal mortar joint between the water jet device and the 3D printing head, and the distance between the baffle and the water jet device is kept constant. The baffle is preferably a rubber sheet and has certain flexibility.

Step 6: the working equipment advances forward: after all the horizontal mortar joints in the current mortar replacement area are replaced, the replacement state is as shown in fig. 7, the working equipment moves forward, and the mortar replacement of the next mortar replacement area is started.

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.