CN111155664A - Crack control construction method for aerated concrete block filler wall - Google Patents
Crack control construction method for aerated concrete block filler wall Download PDFInfo
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- CN111155664A CN111155664A CN202010180843.XA CN202010180843A CN111155664A CN 111155664 A CN111155664 A CN 111155664A CN 202010180843 A CN202010180843 A CN 202010180843A CN 111155664 A CN111155664 A CN 111155664A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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Abstract
The invention relates to a crack control construction method for aerated concrete block infilled walls, which pre-embeds nodules made of engineering plastics in a solid state, melts the nodules by hot melting in the middle of tamping, the dissolved engineering plastics can enter tiny gaps of a base layer part and recover to the solid state again after power failure, so that after construction is completed, the special-shaped structure pre-embedded objects made of the engineering plastics can effectively fill tiny gaps between infilled walls and structural frames, and meanwhile, the crack phenomenon of concrete materials caused by fracture can be avoided by utilizing the characteristic of good expansion performance of the engineering plastics, thereby realizing the advantage of crack prevention in long-term construction.
Description
Technical Field
The invention belongs to the technical field of crack control construction of aerated concrete block infilled walls, and particularly relates to a crack control construction method of an aerated concrete block infilled wall.
Background
At present, masonry materials are important parts in building materials, and due to the requirements of environmental protection and energy conservation, the masonry materials are various in forms from traditional clay bricks to novel wall materials such as concrete hollow blocks, fly ash aerated silicate blocks, aerated concrete blocks and the like. When the masonry works together with materials such as concrete, cement mortar and the like, the shrinkage deformation values of the masonry are greatly different, and some of the masonry and cement mortar are even different by several times, so that cracks are easy to generate during long-term work. Masonry infilled wall cracks are deformation cracks which are mainly cracks caused by temperature, drying shrinkage and the like. Although the structural safety risk is not formed, if the outer wall cracks, the leakage phenomenon is easy to cause, the normal use of residents is seriously influenced, and the maintenance is difficult; especially, the outer wall of a high-rise building is subjected to large wind pressure, is strongly influenced by wind and rain, and can generate other continuous quality or safety accidents after leakage occurs. The crack of the inner wall can seriously affect the appearance and quality of the building, and particularly, the requirement on the living and working environment is higher and higher along with the increasing improvement of the living standard of people, so that the problem of crack of the filling wall is urgently solved.
The prior patent CN2013101996246 discloses a construction method for preventing and treating cracks between a concrete structure and a filling wall, which specifically comprises the following operation steps: the method comprises the following steps: construction preparation; step two: carrying out base layer treatment; step three: paying off and erecting bark tree trunks; step four: laying bricks to form a residual bottom; step five: building a filler wall; step six: constructing a plain concrete constructional column; step seven: the top of the masonry is filled. The beneficial effects of the invention are shown in the following aspects: 1. the application range is wide: the method is suitable for the masonry construction of filling walls of concrete structures of industrial and civil buildings, such as hollow bricks, autoclaved aerated concrete blocks and the like; 2. compared with the traditional process, the main difference in the process is that masonry is replaced by plain concrete constructional columns, concrete reinforcing belts, hard concrete filled on the wall top and the like, so that the cost can be saved; 3. fundamentally has solved because of concrete structure and infilled wall contact surface crack lead to the plastering layer and the cracking of dope layer, has improved engineering impression level and engineering quality, has stopped outer wall face seepage risk, reduces rework and cost of maintenance, has practiced thrift the material, has reduced the production of building rubbish, has reduced user's complaint rate, can establish the image of enterprise in the society, and social benefit is considerable.
However, due to the factor of poor crack resistance of plain concrete, although the technical scheme of the invention can solve the problem of crack resistance in a short time, the crack is easy to crack in long-term use, so that a crack control construction method for an aerated concrete block filler wall, which can be maintained for a long time and is simple to construct, is urgently needed in the prior art.
Disclosure of Invention
The invention aims to provide a crack control construction method for an aerated concrete block infilled wall, which can be used for long-term construction and preventing cracking, and adopts the following technical scheme:
the crack control construction method for the aerated concrete block infilled wall comprises the following steps:
1) masonry infilled wall
Building blocks in a staggered manner up and down and in a staggered manner at the joint to form a filler wall, and reserving a margin gap between the filler wall and the structural beam column;
2) construction of filling base layer
Dividing the allowance gap into at least two parts along the thickness direction, selecting one part as a base layer part, and the other part as a surface layer part, wherein the base layer part is positioned on one side of a single surface layer part or among a plurality of surface layer parts;
when the base layer part is poured, a first die cavity between a first side plate and a second side plate of a template is used for restraining the base layer part, then a heating wire with a plurality of nodules made of engineering plastics is pre-embedded in the base layer part, then the base layer part is poured in a layered mode by adopting 80 +/-20C 20 micro-expansive concrete, and finally, the base layer part is vibrated and compacted outside the template, and the construction of the base layer part is completed;
the vibrating and tamping process comprises the following steps: firstly, moving upwards point by point and the moving distance is not more than 0.5m, and then moving downwards point by point and the moving distance is not more than 0.3m under the state of electrifying and heating the electric heating wire;
wherein the second side plate is located in the allowance gap;
3) construction of filling surface layer
After the base layer part is solidified, removing the second side plate, erecting a third side plate outside the allowance gap, restraining the surface layer part by a second mold cavity between the third side plate and the base layer part, filling the surface layer part with C20 micro-expansive concrete, and tamping until the slump of the surface layer part is controlled within 30-40 mm to complete the concrete body of the surface layer part;
and then, removing the template, embedding the pea stones into the surface of the concrete body at the surface layer part, and trowelling the surface by using cement mortar.
Preferably, the width of the margin gap is 40-100 mm.
Preferably, the hollow spherical heating ball which is connected with the heating wire in series in a conductive mode is embedded in the nodule, and the nodule is fixedly connected on the heating ball in a hot-melt bonding mode and is divided into a surface part which is wrapped outside the heating ball and an inner part which is filled in the heating ball.
Preferably, the nodules are of epoxy or polyurethane.
Preferably, the allowance gap is divided into three parts along the thickness direction, namely a base layer part positioned in the middle and two surface layer parts positioned on the side edges;
in the step 2), two side plates of the template are both positioned in the allowance gap, and the two side plates are mutually a first side plate;
in step 3), one of the two second side plates is removed first, and after the surface layer part on one side is completed, the other side plate is removed.
Preferably, in step 3), a wavy metal wire extending in the length direction of the allowance gap is embedded in the surface layer part.
Preferably, the metal wire is a wire integrally and electrically connected to an end of the heating wire.
Preferably, the metal wires are two in number and overlap each other.
The invention has the beneficial effects that:
the nodules made of the engineering plastic materials are embedded in the solid state, the nodules are melted by hot melting in the middle period of tamping, the dissolved engineering plastic materials can enter small gaps of the base layer part, and the solid state is restored again after power failure, so after construction is completed, the special-shaped structure embedded objects made of the engineering plastic materials can effectively fill very small gaps between the filler wall and the structure frame, meanwhile, the engineering plastic materials can be used for being good in expansion performance, the phenomenon of cracking caused by fracture between the concrete materials is avoided, and the advantage of cracking prevention in long-term construction is achieved.
Drawings
FIG. 1 is a diagram of formwork erection between a infilled wall and a structural beam column;
FIG. 2 is a schematic view of a portion of a foundation layer between a infill wall and a structural beam column;
FIG. 3 is a schematic view of a portion of the skin between a infill wall and a structural beam column;
fig. 4 is a schematic view of another wire embedding manner for the surface layer part between the filler wall and the structural beam column.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment
The crack control construction method for the aerated concrete block filler wall comprises the following steps:
1. construction preparation;
1.1. the main concrete structure sub-part is constructed and is qualified after being checked and accepted;
1.2. manufacturing a skin number rod, and noting the skin number of the masonry, the thickness of the mortar joint, the size elevations of a door and window opening, wood bricks, tie bars, ring beams and the like;
1.3. connecting tie bars among the filler wall, the concrete structural wall, the columns and the beams by adopting chemical steel planting according to design specifications and intervals, and performing an anchoring steel bar drawing test, wherein the tie bars meet the 9.2.3 specification of masonry structure engineering construction quality acceptance criteria (GB 50203-2011);
1.4. the mixing proportion of the masonry mortar and the C20 fine aggregate concrete is determined by qualified laboratories, and a mortar test mold is prepared;
1.5. before the construction of the filler wall masonry, technical personnel should be organized to be familiar with drawings and carry out technical intersection on operators.
2. Framework foundation processing
2.1. And cleaning dust, dirt, sundries and the like on the top surface of the foundation beam, the floor and the contact surface of the concrete wall column and the masonry body, and sprinkling water to moisten the foundation beam and the floor. Checking a pull-through line according to the elevation of the first lowest leather building block, and leveling by using fine aggregate concrete above C15 if the thickness of a horizontal mortar joint exceeds 20 mm;
2.2. the contact surface of the concrete structure wall, column, beam and filling wall is roughened by mechanical spraying or broom brushing of a layer of interfacial agent, or the surface of the concrete structure is shaved by a chisel.
3. Paying-off and bark-erecting tree rod
The axis, the wall side line, the constructional column position line, the plain concrete constructional column line and the door and window opening line which are popped up according to the design drawing; the method comprises the steps of erecting a skin number rod, marking the skin number and the mortar joint thickness of a masonry body, and the structural elevations of a door and window opening, a wall pulling rib, a wall beam and the like, wherein the skin number rod interval is 15-20 m, corners are required to be arranged, the height of the skin number rod is generally 50mm away from the skin or the wall corner, the height of the position marking line of a windowsill and a window top is close to a concrete wall or a column, the position marking line of the windowsill and the window top can be directly marked on the wall or the column, and after the construction and the paying-off are finished, the wall can be built after the acceptance of.
4. Brick laying residual bottom
The method is characterized in that bricks are tried to be arranged according to the length and height of a wall body to be built, positions of plain concrete constructional columns, doors, windows and holes are arranged, when a first brick of an external wall is laid at the bottom, a transverse wall should be laid with the T-shaped bricks, and a brick on the level of a step such as a lower brick of a beam and a beam pad, a windowsill and the like is built with the T-shaped bricks.
5. Masonry infilled wall
5.1. The building method is correct, the building mortar joints are staggered up and down, the joints are interlocked and lapped, bricks or building blocks with serious corner falling are not suitable for use, the building mortar joints are horizontally flat and vertical, the hollow brick masonry is horizontal and vertical, the mortar joints are 8-12 mm, the horizontal mortar joints of the autoclaved aerated concrete masonry are 15mm, the vertical mortar joints are 20mm, when the autoclaved aerated concrete building blocks are used for building in kitchens, toilets, bathrooms and the like, a concrete sill table is suitable for being cast in place at the bottom of the wall, the height of the concrete sill table is 150mm, the hollow bricks are staggered up and down, the directions of the brick holes are in accordance with the design requirements, when the design is not required, the brick holes are placed in the horizontal position, when the brick holes are vertically built, the sheathing board is horizontally laid, the vertical seams of the bricks are laid with mortar firstly, then the bricks are built, when the walls are built, the staggered joints are filled, the building length of the autoclaved aerated concrete building blocks is not less than 1/3, the height of the plain concrete constructional column is not less than 150mm, the plain concrete constructional column with low grade between a filler wall and a concrete structure is required to be subjected to line snapping at the position of the plain concrete constructional column, and during wall building, a serrated racking is built at the joint of the plain concrete constructional column, wherein the width of the plain concrete constructional column is 90mm, the reserved size of the serrated racking is 30mm, the size of each serrated racking along the height direction is not more than 300mm, the serrated racking is withdrawn firstly and then, so that the combined building of up-down staggered joints of building blocks and staggered joints at the joint is realized, the filler wall is built, and a margin gap of 40-100mm is reserved between the filler wall 9 and a structural beam column 8;
5.2. when the design is not required, but the height of the infilled wall 9 is more than 4m and the design is not required, a 120mm high concrete reinforcing band is arranged at the top of the door opening or at a position 2.1m away from the bottom of the wall, and is matched with a 2 phi 6 steel bar, so that the integrity of the wall is increased, a technical interval is artificially increased, the wall can be prevented from being built too high at one time, and the reinforcing band is poured by C20 fine stone concrete and is compacted by vibration;
5.3. the method for keeping the pipeline in place comprises the steps of setting plain concrete constructional columns, ring beams, lintels, various reserved holes, embedded parts and the like according to design requirements, avoiding later-stage chiseling, when hollow bricks are built, when no specific requirements are required in design, adopting brick-through holes for pre-burying or positioning by elastic lines, then slotting by a toothless saw (for aerated concrete blocks) without leaving horizontal slots, tightly filling and sealing by C20 micro-expansive concrete after the pipeline is installed, externally pasting alkali-resistant glass fiber cloth, or processing according to the design requirements, building wall corners and the joints of longitudinal and transverse walls at the same time, building inclined joints when the joints are broken at the time, keeping 50-70 mm gaps when the horizontal projection length of the inclined joints is not less than 2/3 of height, building the filler wall 9 to be close to beams and slabs, compacting the gaps according to the seventh step, after the building of the filler wall 9 is finished and at least 14 days, pulling the gaps to be filled, and connecting the lines when the filler wall 9 is built, the wall body is vertical and flat without being broken by bricks or broken bricks.
6. Construction of filling base layer
As shown in fig. 1 and 2, the allowance space is divided into two portions in the thickness direction, one side portion is a base layer portion 14, the other side portion is a surface layer portion 15, and the base layer portion 14 is located on one side of a single surface layer portion 15 or between a plurality of surface layer portions 15. When the base layer part 14 is poured, the base layer part 14 is restrained by a first die cavity between a first side plate 11 and a second side plate 12 of the template 1, then the heating wires 3 with a plurality of epoxy resin material nodules 2 are pre-buried in the base layer part, then the base layer part 14 is poured in a layered mode by adopting 80 +/-20C 20 micro-expansive concrete, and finally the base layer part 14 is vibrated and compacted outside the template 1 to complete construction of the base layer part 14. The vibrating and tamping process comprises the following steps: the device moves upwards point by point and the moving distance is not more than 0.5m, and then moves downwards point by point and the moving distance is not more than 0.3m under the state of electrifying and heating the electric heating wire.
Wherein, pre-buried heating ball that has the spherical and electrically conductive concatenation on heating wire 3 of fretwork in the knot 2, knot 2 adopts hot melt bonding's mode consolidation on heating ball 4 to divide into the surface part of parcel outside heating ball 4 and be full of the inside part in heating ball 4.
7. Construction of filling surface layer
7.1. After the base layer part 14 is solidified, removing the second side plate 12, erecting a third side plate outside the allowance gap, constraining the surface layer part 15 by a second mold cavity between the third side plate 13 and the base layer part 14, pre-burying a wavy metal wire 5 extending along the length direction of the allowance gap in the surface layer part 15, filling the surface layer part 15 with C20 micro-expansion concrete, and tamping until the slump of the surface layer part 15 is controlled within 30-40 mm, thereby completing the concrete body of the surface layer part 15;
7.2. and (3) removing the template 1, embedding the pea stones into the surface of the concrete body of the surface layer part 15, and trowelling the pea stones by using cement mortar.
The metal wire 5 is a wire integrally and electrically connected to the end of the heating wire 3. Two embedded line bodies are formed by the nodules 2, the heating lines 3 and the metal wires 5, the two embedded line bodies are parallel to each other in the base layer part 14, and the two embedded line bodies can be arranged in the surface layer part 15 at intervals as shown in fig. 3 or in a staggered and overlapped manner as shown in fig. 4.
In other embodiments, the margin gap may be divided into three portions along the thickness direction, namely, a base layer portion 14 located in the middle and two surface layer portions 15 located at the side edges; two side plates of the template 1 are both positioned in the allowance gap and are first side plates 11; when the surface portion 15 is filled, one of the two second side plates 12 is removed, and after the surface portion 15 on one side is completed, the other is removed.
The above description is only about the preferred embodiment of the present invention, but it should not be understood as limiting the claims, and the present invention may be modified in other structures, not limited to the above structures. In general, all changes which come within the scope of the invention are intended to be embraced therein.
Claims (8)
1. The crack control construction method for the aerated concrete block infilled wall is characterized by comprising the following steps of:
1) masonry infilled wall
Building blocks in a staggered manner up and down and in a staggered manner at the joint to form a filler wall, and reserving a margin gap between the filler wall and the structural beam column;
2) construction of filling base layer
Dividing the allowance gap into at least two parts along the thickness direction, selecting one part as a base layer part, and the other part as a surface layer part, wherein the base layer part is positioned on one side of a single surface layer part or among a plurality of surface layer parts;
when the base layer part is poured, a first die cavity between a first side plate and a second side plate of a template is used for restraining the base layer part, then a heating wire with a plurality of nodules made of engineering plastics is pre-embedded in the base layer part, then the base layer part is poured in a layered mode by adopting 80 +/-20C 20 micro-expansive concrete, and finally, the base layer part is vibrated and compacted outside the template, and the construction of the base layer part is completed;
the vibrating and tamping process comprises the following steps: firstly, moving upwards point by point and the moving distance is not more than 0.5m, then dissolving the nodules under the state of electrifying and heating the electric heating wire, and moving downwards point by point and the moving distance is not more than 0.3 m;
wherein the second side plate is located in the allowance gap;
3) construction of filling surface layer
After the base layer part is solidified, removing the second side plate, erecting a third side plate outside the allowance gap, restraining the surface layer part by a second mold cavity between the third side plate and the base layer part, filling the surface layer part with C20 micro-expansive concrete, and tamping until the slump of the surface layer part is controlled within 30-40 mm to complete the concrete body of the surface layer part;
and then, removing the template, embedding the pea stones into the surface of the concrete body at the surface layer part, and trowelling the surface by using cement mortar.
2. The aerated concrete block infilled wall crack control construction method of claim 1, characterized in that the width of the margin gap is 40-100 mm.
3. The crack control construction method for the aerated concrete block filled wall according to claim 1, wherein the interior of the nodule is pre-embedded with a hollow sphere and a heating ball which is connected with the heating wire in series in a conductive manner, and the nodule is fixedly connected on the heating ball in a hot-melt bonding manner and is divided into a surface part which is wrapped outside the heating ball and an inner part which is filled in the heating ball.
4. The aerated concrete block infilled wall crack control construction method of claim 3, characterized in that the nodules are epoxy or polyurethane.
5. The crack control construction method of aerated concrete block infilled wall according to any one of claims 1 to 4, characterized in that the allowance space is divided into three parts in the thickness direction, respectively a base layer part located in the middle and two surface layer parts located at the side edges;
in the step 2), two side plates of the template are both positioned in the allowance gap, and the two side plates are mutually a first side plate;
in step 3), one of the two second side plates is removed first, and after the surface layer part on one side is completed, the other side plate is removed.
6. The crack control construction method for aerated concrete block filler walls according to any one of claims 1 to 4, wherein in step 3), wavy metal wires extending in the length direction of the allowance space are embedded in the surface layer part.
7. The crack control construction method for aerated concrete block filled walls according to claim 6, wherein the metal wire is a wire integrally and electrically connected with the end of the heating wire.
8. The crack control construction method of aerated concrete block infilled wall according to claim 6, characterized in that two wires are provided and are overlapped with each other in a staggered manner.
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| CN108395137A (en) * | 2018-03-27 | 2018-08-14 | 武汉理工大学 | A kind of electromagnetically induced cement concrete crack autogenous healing epoxide resin type microcapsules and preparation method thereof |
| CN108661250A (en) * | 2018-06-04 | 2018-10-16 | 中建局集团建设发展有限公司 | Inversion-type waterproof heat-retaining roof structure and its construction method |
| KR102057156B1 (en) * | 2018-06-08 | 2019-12-18 | 박상민 | Floor crack prevention and interlayer sound insulation structure and floor construction method using the same |
| CN110294609A (en) * | 2019-06-21 | 2019-10-01 | 游雪花 | A kind of preparation method of concrete creak self-repair material |
| CN110359455A (en) * | 2019-08-16 | 2019-10-22 | 中国电建集团成都勘测设计研究院有限公司 | Provisions for grouting applied to cooling water pipe peripheral temperature seam |
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