阅读说明：本技术 砌体改造底部框架-抗震墙砌体结构的施工方法 (Construction method for brickwork reconstruction bottom frame-earthquake-resistant wall brickwork structure ) 是由 林鹏 马灵会 王志泉 王大军 安炳� 刘鹏 方张暾 高明川 周小娟 于 2021-06-29 设计创作，主要内容包括：本发明公开了砌体改造底部框架-抗震墙砌体结构的施工方法,属于建筑施工技术领域。包括以下步骤：S1、房心土开挖；S2、桩基挖孔；S3、基础施工；S4、底层框架结构施工；S5、砌体结构改造加固施工；S6、按改造图纸定位需拆除墙体；S7、拆除底层墙体；S8、基础梁施工。本发明将原砌体结构改造成底部框架-抗震墙砌体结构,通过砖砌体和钢筋混凝土的合理组合,加固了框架柱的整体强度,加强房屋的整体性,能够增加结构的整体抗震能力,达到抗震加固的效果,同时本发明具有比多层钢筋混泥土框架结构造价低和便于施工的优点,对于欠发达地区及中小型城镇,本发明在经济方面具有一定的优势及现实意义,便于推广使用。(The invention discloses a construction method for reconstructing a bottom frame-earthquake-resistant wall masonry structure from masonry, and belongs to the technical field of building construction. The method comprises the following steps: s1, excavating house soil; s2, digging holes in the pile foundation; s3, constructing a foundation; s4, constructing a bottom layer frame structure; s5, carrying out masonry structure transformation and reinforcement construction; s6, the wall is dismantled according to the positioning requirement of the reconstruction drawing; s7, removing the bottom wall; and S8, constructing the foundation beam. The invention changes the original masonry structure into the bottom frame-earthquake-resistant wall masonry structure, strengthens the integral strength of the frame column, enhances the integrity of the house, can increase the integral earthquake resistance of the structure and achieves the earthquake-resistant reinforcing effect by reasonably combining the brick masonry and the reinforced concrete, has the advantages of lower manufacturing cost and convenient construction compared with a multi-layer reinforced concrete frame structure, and has certain advantages and practical significance in the aspect of economy and convenient popularization and use for underdeveloped areas and medium-sized and small towns.)

1. The construction method for reconstructing the bottom frame-earthquake-resistant wall masonry structure by using the masonry is characterized by comprising the following steps of:

s1, excavating atrial soil

Excavating the house soil to the bottom surface of the original foundation, namely the elevation of-1.6 m, and dismantling the original trench and pipeline; the house soil is tamped and backfilled layer by 2:8 lime soil, and the compaction coefficient is more than 0.93;

s2 pile foundation hole digging

The pile foundation adopts manual hole digging, and the pile foundation hole digging is partially dismantled on the original foundation and wall body, namely the original house brick large foot-placing foundation and wall body in the width range of the original ring beam lower bearing platform are dismantled, and the pile foundation is excavated and constructed on the original foundation bottom, namely a side excavation and guide pit mode which is not larger than the outline dimension of the pile foundation bearing platform is adopted under the condition of-1.6 m;

s3, foundation construction

The pile foundation concrete adopts C35, the impervious grade is P8, and the thickness of the steel bar protective layer is 50 mm; c15 is adopted as cushion concrete under the bearing platform, C35 and P8 anti-permeability concrete is adopted as the bearing platform, and the thickness of the steel bar protective layer is 50 mm;

s4 construction of bottom layer frame structure

Before the construction of a bottom layer frame structure, wall plastering, loose mortar and brick loose layers in the range of frame beams and columns are removed, floor plastering is removed, and the surface of original concrete is roughened; cleaning the surface of the original structure, brushing an interface agent, and pouring concrete of the bottom layer frame structure;

s5, masonry structure transformation and reinforcement construction

Masonry structure reforms transform and consolidates and specifically includes: (1) reinforcing a brick wall; (2) reinforcing the constructional column; (3) reinforcing the ring beam; (4) treating wall cracks; (5) reinforcing the beam and the cast-in-place plate;

the brick wall is reinforced by adopting two sides of a high-ductility concrete surface layer;

the constructional column reinforcement adopts a high-ductility concrete-masonry combined constructional column reinforcement method;

the ring beam reinforcement adopts a high-ductility concrete-masonry combined ring beam reinforcement method;

the crack treatment of the wall body adopts a joint filling sealing repair method and a reinforcement joint filling sealing repair method;

when the beam and the cast-in-place plate are reinforced, a steel plate and carbon fibers are additionally arranged at the bottom of the beam, a U-shaped hoop plate is additionally arranged on the beam body, and carbon fibers are additionally arranged at the bottom of the cast-in-place plate;

s6, positioning according to the reconstruction drawing and dismantling the wall

After the concrete structure of the bottom frame reaches the design strength and the bottom frame is qualified through acceptance, the wall body is positioned according to the reconstruction drawing and needs to be dismantled;

s7, removing the bottom wall

And S8, constructing the foundation beam.

2. The construction method of masonry transformation bottom frame-earthquake-resistant wall masonry structure according to claim 1, characterized in that: when the bottom wall is removed, the binding frames on the two sides of the wall are bound to support the wall beam longitudinal bars and the stirrups, phi 100 concrete filling holes are drilled on the floor at intervals, the filling holes avoid the precast slab longitudinal bars, and finally, the precast slabs and the beam are filled in the holes compactly.

3. The construction method of masonry transformation bottom frame-earthquake-resistant wall masonry structure according to claim 1, characterized in that: when the bottom wall is dismantled, the bottom frame structure concrete needs to be waited for to reach the design strength, and the upper masonry structure can be dismantled after being reinforced.

4. The construction method of masonry transformation bottom frame-earthquake-resistant wall masonry structure according to claim 1, characterized in that: in the wall crack treatment for the reconstruction and reinforcement of the masonry structure, a cracked wall is treated by pressure grouting, and then a tie bar is arranged at every three brick thicknesses to enhance the overall crack resistance of the wall.

5. The construction method of masonry transformation bottom frame-earthquake-resistant wall masonry structure according to claim 1, characterized in that: when the high-ductility concrete surface layer double-sided reinforced brick wall is adopted for reinforcement, the thickness of each side surface layer is 15 mm.

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a construction method for reconstructing a bottom frame-earthquake-resistant wall masonry structure by brickwork.

Background

The bottom frame-earthquake-resistant wall masonry house refers to a house with one or two layers of frame earthquake-resistant wall structures with larger space at the bottom and a multi-layer masonry structure at the upper part. The large space at the bottom of the house can meet the use function requirements of markets, restaurants, meeting rooms, parking garages and the like, and the upper part of the house can meet the use requirements of smaller rooms of houses, offices and the like. The structure is more economic than a full frame structure (the construction cost can be saved by 20 to 30 percent under the same using function condition), and simultaneously has the using characteristics of large space and convenient flexible arrangement of the frame structure, and the structure is simple in construction and short in construction period.

The bottom layer or two layers at the bottom of the bottom frame-earthquake-resistant wall masonry house is set to be a frame-earthquake-resistant wall system. The stress of the bottom layer or two layers at the bottom of the bottom frame-earthquake-resistant wall masonry house is complex, the safety of the whole house is endangered by the serious damage of the bottom, the deformation capability of the frame columns is reduced by the additional axial force generated by the earthquake overturning moment on the frame columns, and the like, and the requirement on the bottom earthquake-resistant structure system is higher.

Disclosure of Invention

The invention aims to provide a construction method for reconstructing a bottom frame-earthquake-resistant wall masonry structure by using masonry, so as to solve the problems in the background technology.

The technical scheme adopted by the invention is as follows:

the construction method for reconstructing the bottom frame-earthquake-resistant wall masonry structure by using the masonry comprises the following steps of:

s1, excavating atrial soil

Excavating the house soil to the bottom surface of the original foundation, namely the elevation of-1.6 m, and dismantling the original trench and pipeline; the house soil is tamped and backfilled layer by 2:8 lime soil, and the compaction coefficient is more than 0.93;

s2 pile foundation hole digging

The pile foundation adopts manual hole digging, and the pile foundation hole digging is partially dismantled on the original foundation and wall body, namely the original house brick large foot-placing foundation and wall body in the width range of the original ring beam lower bearing platform are dismantled, and the pile foundation is excavated and constructed on the original foundation bottom, namely a side excavation and guide pit mode which is not larger than the outline dimension of the pile foundation bearing platform is adopted under the condition of-1.6 m;

s3, foundation construction

The pile foundation concrete adopts C35, the impervious grade is P8, and the thickness of the steel bar protective layer is 50 mm; c15 is adopted as cushion concrete under the bearing platform, C35 and P8 anti-permeability concrete is adopted as the bearing platform, and the thickness of the steel bar protective layer is 50 mm;

s4 construction of bottom layer frame structure

Before the construction of a bottom layer frame structure, wall plastering, loose mortar and brick loose layers in the range of frame beams and columns are removed, floor plastering is removed, and the surface of original concrete is roughened; cleaning the surface of the original structure, brushing an interface agent, and pouring concrete of the bottom layer frame structure;

s5, masonry structure transformation and reinforcement construction

Masonry structure reforms transform and consolidates and specifically includes: (1) reinforcing a brick wall; (2) reinforcing the constructional column; (3) reinforcing the ring beam; (4) treating wall cracks; (5) reinforcing the beam and the cast-in-place plate;

the brick wall is reinforced by adopting two sides of a high-ductility concrete surface layer;

the constructional column reinforcement adopts a high-ductility concrete-masonry combined constructional column reinforcement method;

the ring beam reinforcement adopts a high-ductility concrete-masonry combined ring beam reinforcement method;

the crack treatment of the wall body adopts a joint filling sealing repair method and a reinforcement joint filling sealing repair method;

when the beam and the cast-in-place plate are reinforced, a steel plate and carbon fibers are additionally arranged at the bottom of the beam, a U-shaped hoop plate is additionally arranged on the beam body, and carbon fibers are additionally arranged at the bottom of the cast-in-place plate;

s6, positioning according to the reconstruction drawing and dismantling the wall

After the concrete structure of the bottom frame reaches the design strength and the bottom frame is qualified through acceptance, the wall body is positioned according to the reconstruction drawing and needs to be dismantled;

s7, removing the bottom wall

And S8, constructing the foundation beam.

When the bottom wall is removed, the binding frames on the two sides of the wall are bound to support the wall beam longitudinal bars and the stirrups, phi 100 concrete filling holes are drilled on the floor at intervals, the filling holes avoid the precast slab longitudinal bars, and finally, the precast slabs and the beam are filled in the holes compactly.

When the bottom wall is dismantled, the bottom frame structure concrete needs to be waited for to reach the design strength, and the upper masonry structure can be dismantled after being reinforced.

In the wall crack treatment for the reconstruction and reinforcement of the masonry structure, a cracked wall is treated by pressure grouting, and then a tie bar is arranged at every three brick thicknesses to enhance the overall crack resistance of the wall.

When the high-ductility concrete surface layer double-sided reinforced brick wall is adopted for reinforcement, the thickness of each side surface layer is 15 mm.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

the invention changes the original masonry structure into the bottom frame-earthquake-resistant wall masonry structure, strengthens the integral strength of the frame column, enhances the integrity of the house, increases the ductility of the wall body, can increase the integral earthquake resistance of the structure and achieves the earthquake-resistant reinforcing effect by reasonably combining the brick masonry and the reinforced concrete, has the advantages of lower manufacturing cost and convenient construction compared with a multilayer reinforced concrete frame structure, and has certain advantages and practical significance in the aspect of economy and convenient popularization and use for underdeveloped areas and medium-sized and small towns.

Drawings

Fig. 1 is a schematic diagram of the pile foundation hole digging structure of the invention.

The labels in the figure are: 1. original brick walls; 2. brick-built large foot-placing foundation of the original house; 3. newly making a pile foundation hole; 4. the original ground ring beam.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments and accompanying drawings further illustrate the present invention in detail.

Example 1

The construction method for reconstructing the bottom frame-earthquake-resistant wall masonry structure by using the masonry comprises the following steps of:

s1, excavating house soil; excavating the house soil to the bottom surface of the original foundation, namely the elevation of-1.6 m, and dismantling the original trench and pipeline; the house soil is tamped and backfilled layer by 2:8 lime soil, and the compaction coefficient is more than 0.93;

s2, digging holes in the pile foundation; as shown in fig. 1, a pile foundation hole is manually dug, and the pile foundation hole is partially removed from an original foundation and an original wall body 1, namely, a large footing foundation 2 and a wall body are bricked in an original house in a bearing platform width range below-0.690 under an original ring beam 4, and the pile foundation hole is newly dug and constructed at the original foundation bottom, namely, at-1.6 m in a manner that a pile foundation bearing platform contour dimension is not more than a side excavation pit;

s3, constructing a foundation; the pile foundation concrete adopts C35, the impervious grade is P8, and the thickness of the steel bar protective layer is 50 mm; c15 is adopted as cushion concrete under the bearing platform, C35 and P8 anti-permeability concrete is adopted as the bearing platform, and the thickness of the steel bar protective layer is 50 mm;

s4, constructing a bottom layer frame structure; before the construction of a bottom layer frame structure, wall plastering, loose mortar and brick loose layers in the range of frame beams and columns are removed, floor plastering is removed, and the surface of original concrete is roughened; cleaning the surface of the original structure, brushing an interface agent, and pouring concrete of the bottom layer frame structure;

s5, carrying out masonry structure transformation and reinforcement construction; masonry structure reforms transform and consolidates and specifically includes:

(1) reinforcing the brick wall by adopting the two sides of the high-ductility concrete surface layer;

(2) reinforcing the constructional column by adopting a high-ductility concrete-masonry combined constructional column reinforcing method;

(3) the ring beam is reinforced by adopting a high-ductility concrete-masonry combined ring beam reinforcing method;

(4) processing wall cracks by adopting a joint filling sealing repair method and a reinforcement joint filling sealing repair method; in the wall crack treatment, a cracked wall is treated by pressure grouting, and then a tie bar is arranged at intervals of three brick thicknesses to enhance the integral crack resistance of the wall;

(5) reinforcing the beam and the cast-in-place plate; when the beam and the cast-in-place plate are reinforced, a steel plate and carbon fibers are additionally arranged at the bottom of the beam, a U-shaped hoop plate is additionally arranged on the beam body, and carbon fibers are additionally arranged at the bottom of the cast-in-place plate;

s6, positioning according to the reconstruction drawing and dismantling the wall

After the concrete structure of the bottom frame reaches the design strength and the bottom frame is qualified through acceptance, the wall body is positioned according to the reconstruction drawing and needs to be dismantled;

s7, removing the bottom wall; when the bottom wall is dismantled, the bottom frame structure concrete needs to be waited for to reach the design strength, and the upper masonry structure can be dismantled after being reinforced. Binding frame wall supporting beam longitudinal bars and stirrups at two sides of a wall to be removed when a bottom wall is removed, drilling holes with phi 100 concrete at intervals on a floor slab, avoiding precast slab longitudinal bars through the concrete pouring holes, and finally pouring concrete with the same strength grade as the beam in the holes to be dense;

and S8, constructing the foundation beam.

Example 2

On the basis of the embodiment 1, when the high-ductility concrete surface course double-sided reinforced brick wall is used for reinforcement, the thickness of the concrete surface course on each side is 15 mm.

The above description is only exemplary of the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.