CN112982748A - Construction method of large-span cast-in-place clear water impervious wall - Google Patents
Construction method of large-span cast-in-place clear water impervious wall Download PDFInfo
- Publication number
- CN112982748A CN112982748A CN202110205285.2A CN202110205285A CN112982748A CN 112982748 A CN112982748 A CN 112982748A CN 202110205285 A CN202110205285 A CN 202110205285A CN 112982748 A CN112982748 A CN 112982748A
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- concrete
- template
- impervious wall
- construction method
- clear water
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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
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/84—Walls made by casting, pouring, or tamping in situ
-
- 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
-
- 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
Abstract
The invention discloses a construction method of a large-span cast-in-place clear water impervious wall, and relates to the technical field of wall construction. The method comprises the following steps: building a masonry protection wall with the thickness of 120mm by using M5 cement mortar, and coating a first cement mortar leveling layer on the outer side of the masonry protection wall; treating the base surface of the first cement mortar leveling layer, and paving a waterproof roll; coating a second cement mortar leveling layer and a rigid waterproof layer on the outer side of the waterproof roll; performing interface treatment on the horizontal construction joint; installing impervious wall reinforcing steel bars; processing and manufacturing a template; installing a template; trial preparation and optimization of the concrete mixing proportion; pouring the concrete after premixing and transporting the concrete; removing the template; and (5) curing the concrete. The invention controls each procedure in the construction process, so that the aim of beautiful appearance, no appearance quality defect and water leakage can be achieved after the fair-faced concrete is formed; the plastering process is omitted, the construction period is shortened, the common quality problems easily caused during plastering can be avoided, and the construction cost is reduced.
Description
Technical Field
The invention belongs to the technical field of wall construction, and particularly relates to a construction method of a large-span cast-in-place clear water impervious wall.
Background
With the increase of the overall level of the capital construction industry in China and the rise of green buildings, the appearance quality of cast-in-place concrete after being formed attracts more and more attention, and the clear water concrete gradually enters the visual field of people. The bare concrete is also called as decorative concrete, after the template is removed, the bare concrete is not brushed any more, and only a few transparent protective agents are coated, so that the bare concrete gives people a sense of safety and stability in a single and concise space form. However, because the pouring span of the concrete of the impervious wall is large, the hydration heat generated by the continuously poured concrete is high, the hydration heat on the surface can be quickly diffused into the air to be quickly cooled, and the hydration heat in the interior is not easy to diffuse, so that a large temperature difference between the interior and the exterior is formed, and temperature cracks are easily generated. The cable interlayer has many pre-buried wall-penetrating pipelines and pre-buried iron pieces, the erection quality of the template and the supporting system is seriously influenced, and concrete apparent quality defects such as template running, slurry leakage, slab staggering and the like caused by untight abutted seams of the template are easy to occur. We summarize this technology and form the present process.
Disclosure of Invention
The invention aims to provide a construction method of a large-span cast-in-place clear water impervious wall, which solves the existing problems: because the pouring span of the concrete of the impervious wall is large, the hydration heat generated by the continuously poured concrete is high, the hydration heat on the surface can be quickly diffused into the air to be quickly cooled, and the hydration heat in the interior is not easy to diffuse, so that a large temperature difference between the interior and the exterior is formed, and temperature cracks are easy to generate.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a construction method of a large-span cast-in-place clear water impervious wall, which comprises the following steps:
building a masonry protection wall with the thickness of 120mm by using M5 cement mortar, and coating a first cement mortar leveling layer with the thickness of 20mm on the outer side of the masonry protection wall;
treating the base surface of the first cement mortar leveling layer, and paving a waterproof roll;
coating a second cement mortar leveling layer and a rigid waterproof layer with the thickness of 20mm on the outer side of the waterproof roll;
performing interface treatment on the horizontal construction joint;
installing impervious wall reinforcing steel bars;
processing and manufacturing a template;
installing a template;
trial preparation and optimization of the concrete mixing proportion;
pouring the concrete after premixing and transporting the concrete;
removing the template;
and (5) curing the concrete.
Further preferably, the treatment of the base surface thereof mainly comprises:
and a horizontal construction joint is reserved at the position of the bottom plate 30cm away from the impervious wall.
Preferably, the impervious wall steel bar is subjected to rust removal on a steel bar raw material before use and then is coated with antirust paint.
Further preferably, wherein the installation of the steel bars for the impervious wall mainly comprises:
a steel bar protective layer cushion block is also arranged during installation;
the cushion blocks of the reinforcing steel bar protection layer are concrete cushion blocks, the space between the cushion blocks is 1m, and the cushion blocks are arranged in a quincunx manner;
the apparent color of the cushion block of the reinforcing steel bar protective layer is consistent with that of the formed concrete.
Further preferably, wherein, the processing and manufacturing of the template mainly comprises:
rechecking the positions of the embedded iron pieces and the through-wall pipeline, and accurately measuring and marking a position line when the template is processed and installed;
cutting the wood template into plates with the same shape and the size larger than the shape by 3mm according to the size and the shape of the embedded part, and fixing the plates with the template;
after the template is erected, adjusting the position of the embedded part to enable the embedded part to be located on the additional plate, fixing the embedded part firmly, and tightly plugging the gap by using glass cement.
Further preferably, wherein the installation form mainly comprises:
selecting a template placing place, and arranging a specially-assigned person to stare and control;
before use, the template is sprayed with water to be wet, so that the template is prevented from deforming and raising edges;
assembling the templates at the horizontal construction joints, adhering a sealing strip at the bottom of the templates, rechecking the verticality and the flatness of the concrete surface in contact with the template surface, ensuring the concrete surface to be poured and the template surface to be tightly combined, and avoiding slurry leakage;
and (4) brushing a release agent, and strictly controlling the dosage of the release agent so as to avoid influencing the surface color of the concrete.
Further preferably, the trial-matching and optimizing the concrete mixing ratio mainly comprises:
strictly controlling the mixing proportion of the concrete, carrying out trial preparation by controlling the total amount of a unit gel material, the unit water-cement ratio, the fly ash, the sand content and other additives and selecting materials, continuously optimizing the mixing proportion of the concrete, and selecting the optimal mixing proportion according to a trial preparation result;
the expansion crack-resistant agent is doped into the concrete to offset the shrinkage tensile stress generated in the hardening process of the concrete, compensate the temperature difference pressure caused by partial hydration heat and prevent the structure from generating harmful cracks.
Further preferably, the pouring of the concrete mainly includes:
before pouring concrete, coating a cement-based infiltration crystal on a horizontal construction joint;
before concrete pouring, adopting the slurry obtained by removing coarse aggregate from the concrete with the same mixing proportion to carry out slurry receiving, wherein the slurry receiving height is 30 mm;
the concrete is vibrated by mainly using a vibrating rod and is assisted by inserting and tamping a bamboo pole;
the concrete is poured in layers, the compaction condition of the concrete of the previous layer must be checked before the concrete of the next layer is poured, and the concrete of the next layer can be poured after the compaction is confirmed;
and after the concrete pouring is finished, extruding the floating slurry on the upper surface by using the same amount of concrete, and after waiting for 15 minutes, re-vibrating by using a vibrating rod for 7-10 seconds.
Further preferably, the curing of the concrete mainly comprises:
covering with a plastic film after concrete pouring and repeated vibration are completed, wherein the duration is 14 d;
the external corner part of the structure is protected by a right-angle wood board and is provided with a striking mark.
The invention has the following beneficial effects:
the invention controls each procedure in the construction process, so that the aim of beautiful appearance, no appearance quality defect and water leakage can be achieved after the fair-faced concrete is formed; the transparent protective agent can be directly coated after the wall body is formed, so that the plastering procedure is omitted, the construction period is shortened, the common quality problems easily caused during plastering can be avoided, and the construction cost is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a construction method of a large-span cast-in-place clear water impervious wall.
The main process of the invention is
M5 cement mortar masonry 120mm thick masonry protection wall → 20mm thick cement mortar leveling layer → base surface treatment → waterproof roll laying → painting 20mm thick cement mortar leveling layer and rigid waterproof layer → horizontal construction joint interface treatment → impervious wall steel bar processing, installation → steel bar hiding acceptance → template processing manufacturing → template entry acceptance → template installation → template position recheck, acceptance → concrete mix proportion trial, optimization → concrete pre-mixing, transportation → concrete entry acceptance, slump test → concrete pouring → template demolition → concrete maintenance → split bolt hole plugging.
Specifically, the method comprises the following steps:
s1, building a 120mm thick masonry protection wall by using M5 cement mortar, and coating a 20mm thick cement mortar leveling layer on the outer side of the masonry protection wall for ensuring the leveling;
s2, further flattening the base surface of the base surface, and paving a waterproof coiled material on the outer side of the base surface;
the waterproof coiled material is smoothly and straightly paved without the defects of empty pavement, bulge, damage and the like.
S3, coating a cement mortar leveling layer and a rigid waterproof layer with the thickness of 20mm on the outer side of the waterproof roll;
s4, horizontal construction joint interface treatment
A horizontal construction joint is only left at the position of the bottom plate 30cm away from the impervious wall, and a vertical construction joint is not left, so that water leakage of the construction joint is avoided.
S5, processing and installing impervious wall reinforcing steel bars;
when the steel bars are welded, attention should be paid to the protection of the waterproof layer, and the waterproof layer is not damaged due to the welding of the steel bars;
when the steel bars are bound, the space between the steel bars and the stirrups, the length of the tie bars of the impervious wall and the size of the stirrups of the wall column are well controlled;
derusting a raw material of the steel bar before processing the steel bar, and painting antirust paint;
the cushion blocks of the steel bar protection layer are concrete cushion blocks, the space between the cushion blocks is 1m, the cushion blocks are arranged in a quincunx mode, and the thickness of the cushion blocks must meet the requirement of design drawings on the thickness of the protection layer. The apparent color of the concrete cushion block is required to be consistent with that of the concrete after the concrete is formed by trial assembly;
the concrete can not be poured and vibrated, so that the vibrating rod is contacted with the reinforcing steel bars, and the deviation of the reinforcing steel bars is avoided.
The protection of the screw head of the vertical steel bar threaded joint is well done, the installation of the plastic protective sleeve of the screw head is checked, the steel bar which is bound well must be covered, and the rusting is prevented.
S6, hidden acceptance of steel bars
S7. template processing and manufacturing
Carefully rechecking the positions of the embedded iron part and the through-wall pipeline, marking the positions on a template sample drawing in detail, accurately measuring and marking a position line during template processing and installation, cutting a wood template into plates with the same shape and the size larger than the shape by 3mm according to the size and the shape of the embedded part, fixing the plates, adjusting the position of the embedded part to be positioned on an additional plate after the template is erected, fixing the embedded part firmly, and tightly plugging a gap by using glass cement;
when a wall formwork meets doors, windows and reserved holes, firstly, checking hole formworks, wherein the hole formworks comprise whether the formworks are firmly installed or not, the rigidity of the formworks, the flatness of the contact surface of the formworks and concrete and the verticality of the formworks, and checking records are made to ensure that the formworks are tightly assembled and do not leak slurry;
s8, installing a template
And selecting a template placing place, and arranging a specially-assigned person to stare at and control to ensure that the template is not damaged before use. Before use, the template is sprayed with water to be wet, so that the template is prevented from deforming and warping.
The splicing seams of the templates at the male and female corners of the wall body are tight and sealed by sealing strips, and the templates are clamped by template clamps after being spliced;
assembling the templates at the horizontal construction joints, adhering a sealing strip at the bottom of the templates, rechecking the verticality and the flatness of the concrete surface in contact with the template surface, ensuring the concrete surface to be poured and the template surface to be tightly combined, and avoiding slurry leakage;
the form must be fully wetted before installation to avoid differential expansion. Brushing a release agent, and strictly controlling the dosage of the release agent so as to avoid influencing the surface color of the concrete;
the split bolt is an M12 bolt, a plastic sleeve is installed during construction, plastic plug sleeves are sleeved at two ends of the plastic sleeve, and a sponge pad is adhered to the plugs to prevent water loss and slurry loss at the plugs.
S9, rechecking and checking and accepting the position of the template
S10, trial preparation and optimization of concrete mixing proportion
The expansion crack resistance agent is doped into the concrete to offset the shrinkage tensile stress generated in the hardening process of the concrete and compensate the temperature difference pressure caused by partial hydration heat, so that the structure is prevented from generating harmful cracks;
strictly controlling the mixing proportion of the concrete, carrying out trial preparation by controlling the total amount of a unit gel material, the unit water-cement ratio, the fly ash, the sand content and other additives and selecting materials, continuously optimizing the mixing proportion of the concrete, and selecting the optimal mixing proportion according to a trial preparation result;
s11, concrete premixing and transporting
S12, entering field acceptance and slump test of concrete
S13, concrete pouring
Before concrete pouring, a cement-based infiltration crystallization is coated on a horizontal construction joint to enhance the compactness of a concrete joint;
before concrete pouring, the slurry is mixed by adopting the slurry obtained by removing coarse aggregate from the concrete with the same mixing ratio, and the slurry mixing height is 30mm, so that root rot is avoided;
the concrete pouring speed is controlled, and vibration leakage or incompact vibration caused by too fast pouring is avoided;
the concrete is vibrated by mainly using a vibrating rod and is assisted by inserting and tamping a bamboo pole;
the concrete is poured in layers, the compaction condition of the concrete of the previous layer must be checked before the concrete of the next layer is poured, and the concrete of the next layer can be poured after the compaction is confirmed;
the vibration forbids the vibrating rod to be attached to the surface of the template and the reinforcing steel bar, so that the template is prevented from being damaged, and black scars, sand spreading and vertical watermarks are avoided;
after the concrete pouring is finished, extruding the floating slurry on the upper surface by using the same amount of concrete, and after waiting for 15 minutes, re-vibrating by using a vibrating rod for 7-10 seconds;
the concrete is used in the same mixing ratio, and the raw materials are from the same production place to ensure no color difference after the concrete is poured and formed.
S14, detaching the template
And (5) removing the template after the concrete pouring is finished and the strength reaches 100%.
S15. concrete curing
After concrete pouring and repeated vibration are finished, covering with a plastic film to ensure that the concrete is sufficiently cured, wherein the curing time is generally 14 d;
the appearance quality of the surface of the concrete is checked, and the surface of each part of the concrete is smooth and tidy, and has uniform color and luster and regular edges and corners. The concrete member which is inspected to have no quality defect is tightly wrapped by the plastic film, so that the concrete is ensured to be sufficiently maintained, the surface pollution of the concrete is prevented, the external corner part of the structure is protected by the right-angle wood board, and a striking mark is arranged.
S16, plugging split bolt holes
To further illustrate the present invention, materials and equipment in one embodiment of the present method are provided, as shown in the following table:
material requirement table
Implement equipment demand meter
| Serial number | Device name | Unit of | Number of |
| 1 | Vibrating rod | Sleeve | 10 |
| 2 | Template clamp | Sleeve | 50 |
| 3 | Electric welding machine | Table (Ref. Table) | 2 |
| 4 | Steel bar bender | Table (Ref. Table) | 2 |
| 5 | 25t truck crane | Table (Ref. Table) | 2 |
| 6 | Plate trailer | Vehicle with a motor | 2 |
| 7 | Slump bucket | Sleeve | 1 |
| 8 | Level gauge | Sleeve | 1 |
| 9 | Theodolite | Sleeve | 1 |
| 10 | Plumb bob | Sleeve | 20 |
| 11 | Measuring tape | An | 10 |
| 12 | Concrete standard test mould | Group of | 20 |
From the above, the working method of the present invention has the following benefits:
the wall body is formed without apparent mass defects, the defect treatment process is omitted, and the construction period is effectively shortened;
the construction method effectively avoids the quality defect problem after cast-in-place concrete molding, enlarges the application range of the fair-faced concrete, and has important significance for promoting the application and development of the fair-faced concrete construction process.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A construction method of a large-span cast-in-place clear water impervious wall is characterized in that: the construction method comprises the following steps:
building a masonry protection wall with the thickness of 120mm by using M5 cement mortar, and coating a first cement mortar leveling layer with the thickness of 20mm on the outer side of the masonry protection wall;
treating the base surface of the first cement mortar leveling layer, and paving a waterproof roll;
coating a second cement mortar leveling layer and a rigid waterproof layer with the thickness of 20mm on the outer side of the waterproof roll;
performing interface treatment on the horizontal construction joint;
installing impervious wall reinforcing steel bars;
processing and manufacturing a template;
installing a template;
trial preparation and optimization of the concrete mixing proportion;
pouring the concrete after premixing and transporting the concrete;
removing the template;
and (5) curing the concrete.
2. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the treatment of the base surface thereof mainly comprises:
and a horizontal construction joint is reserved at the position of the bottom plate 30cm away from the impervious wall.
3. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the impervious wall steel bars are rust-removed from the raw steel bar before use and then painted with an anti-rust paint.
4. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the installation of the impervious wall reinforcing steel bars mainly comprises:
a steel bar protective layer cushion block is also arranged during installation;
the cushion blocks of the reinforcing steel bar protection layer are concrete cushion blocks, the space between the cushion blocks is 1m, and the cushion blocks are arranged in a quincunx manner;
the apparent color of the cushion block of the reinforcing steel bar protective layer is consistent with that of the formed concrete.
5. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the processing and manufacturing of the template mainly comprises:
rechecking the positions of the embedded iron pieces and the through-wall pipeline, and accurately measuring and marking a position line when the template is processed and installed;
cutting the wood template into plates with the same shape and the size larger than the shape by 3mm according to the size and the shape of the embedded part, and fixing the plates with the template;
after the template is erected, adjusting the position of the embedded part to enable the embedded part to be located on the additional plate, fixing the embedded part firmly, and tightly plugging the gap by using glass cement.
6. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the installation of the formwork mainly comprises:
selecting a template placing place, and arranging a specially-assigned person to stare and control;
before use, the template is sprayed with water to be wet, so that the template is prevented from deforming and raising edges;
assembling the templates at the horizontal construction joints, adhering a sealing strip at the bottom of the templates, rechecking the verticality and the flatness of the concrete surface in contact with the template surface, ensuring the concrete surface to be poured and the template surface to be tightly combined, and avoiding slurry leakage;
and (4) brushing a release agent, and strictly controlling the dosage of the release agent so as to avoid influencing the surface color of the concrete.
7. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the trial-mix and optimization of the mix proportion of the concrete mainly comprises:
strictly controlling the mixing proportion of the concrete, carrying out trial preparation by controlling the total amount of a unit gel material, the unit water-cement ratio, the fly ash, the sand content and other additives and selecting materials, continuously optimizing the mixing proportion of the concrete, and selecting the optimal mixing proportion according to a trial preparation result;
the expansion crack-resistant agent is doped into the concrete to offset the shrinkage tensile stress generated in the hardening process of the concrete, compensate the temperature difference pressure caused by partial hydration heat and prevent the structure from generating harmful cracks.
8. The construction method of the large-span cast-in-place clear water impervious wall according to claim 1, wherein the concrete pouring mainly comprises:
before pouring concrete, coating a cement-based infiltration crystal on a horizontal construction joint;
before concrete pouring, adopting the slurry obtained by removing coarse aggregate from the concrete with the same mixing proportion to carry out slurry receiving, wherein the slurry receiving height is 30 mm;
the concrete is vibrated by mainly using a vibrating rod and is assisted by inserting and tamping a bamboo pole;
the concrete is poured in layers, the compaction condition of the concrete of the previous layer must be checked before the concrete of the next layer is poured, and the concrete of the next layer can be poured after the compaction is confirmed;
and after the concrete pouring is finished, extruding the floating slurry on the upper surface by using the same amount of concrete, and after waiting for 15 minutes, re-vibrating by using a vibrating rod for 7-10 seconds.
9. The construction method of the large-span cast-in-place clear water impervious wall as claimed in claim 1, wherein the curing concrete mainly comprises:
covering with a plastic film after concrete pouring and repeated vibration are completed, wherein the duration is 14 d;
the external corner part of the structure is protected by a right-angle wood board and is provided with a striking mark.
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| CN202110205285.2A CN112982748A (en) | 2021-02-24 | 2021-02-24 | Construction method of large-span cast-in-place clear water impervious wall |
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