CN112593749A - Construction method of anti-seepage concrete of MBBR water treatment process structure - Google Patents
Construction method of anti-seepage concrete of MBBR water treatment process structure Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/02—Containers for fluids or gases; Supports therefor
- E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
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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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
- E04G17/0655—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts
- E04G17/0657—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts fully recoverable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention relates to the technical field of concrete construction, in particular to an anti-permeability concrete construction method for an MBBR water treatment process structure. According to the invention, the quantity and the positions of the embedded parts are reasonably set, so that the construction cost is reduced, and the construction quality is ensured; the conical heads at the two ends of the embedded pull rod and the extension pull rod can be detached and reused, so that the construction cost is further reduced; the construction molding is carried out through a continuous pouring mode, the anti-seepage requirement can be met, the tensioning of the construction formwork can be realized after concrete maintenance and formwork dismantling are carried out according to set conditions, the requirement that the construction reaches the surface degree is guaranteed, and the integral concrete quality after construction can be guaranteed.
Description
Technical Field
The invention relates to the technical field of concrete construction, in particular to an anti-permeability concrete construction method for an MBBR water treatment process structure.
Background
Environmental pollution and treatment are key problems at present, and particularly for sewage treatment, the life and work of people are directly influenced. For the sewage treatment, there are the traditional fixed Bed Reactor sewage treatment method, the fluidized Bed Reactor sewage treatment method, the submerged biological filter sewage treatment method, etc., and there are the MBBR (Moving-Bed Biofilm Reactor, MBBR) water treatment processes proposed in recent years, wherein MBBR can run continuously, does not block, does not need back flush, has small head loss and large specific surface area, the corresponding water treatment process has high organic matter removal efficiency and strong phosphorus and nitrogen removal capability, and has been generally accepted in the industry.
The MBBR water treatment process has more complex requirements on the structure of a water treatment structure, has higher requirements on seepage resistance, crack resistance, comprehensive corrosion resistance, precision, strength and the like, and has higher construction difficulty. When actually carrying out the construction, often appear the condition that the construction is not up to standard, not only reduced the efficiency of construction, still reduced MBBR sewage treatment's effect.
Therefore, a more reasonable technical scheme needs to be provided to solve the technical problems in the prior art.
Disclosure of Invention
In order to overcome the defects of the prior art mentioned in the content, the invention provides an anti-seepage concrete construction method for an MBBR water treatment process structure, which aims to control the surface flatness and the verticality of a structural surface and ensure the construction quality by accurately controlling the size of the structural surface; in addition, the consumption of the pull rod is optimized in the construction process, so that the purposes of economy and safety are achieved; meanwhile, the water seepage problem of the structure can be effectively controlled, and the condition of pool body seepage in the later period is avoided.
In order to achieve the purpose, the invention specifically adopts the technical scheme that:
an MBBR water treatment process structure anti-seepage concrete construction method comprises the following steps:
manufacturing and installing steel bars, and building an inner side installation rack and an outer side installation rack at the steel bars;
manufacturing a construction template, and arranging a bottom construction template and a support frame body on the cushion concrete; installing the wall surface construction template on the installation frame body through hoisting;
arranging a plurality of embedded parts on the steel bars and tensioning the wall construction template by the embedded parts;
and (3) pouring concrete, namely, continuously pouring and tamping once, wetting and curing the concrete after the concrete is condensed, wherein the curing time is not less than the specified time, removing the formwork after the curing is finished, and the temperature difference between the surface temperature of the concrete and the environmental temperature is within the specified range during formwork removal.
According to the construction method, the embedded parts are reasonably arranged to connect and fasten the construction template, construction molding is carried out in a continuous pouring mode, concrete curing and template dismantling are carried out according to set conditions, tensioning of the construction template can be achieved, the anti-seepage requirement after construction is met, the requirement of surface degree after construction is met, and the integral concrete quality after construction can be guaranteed.
In the above technical solution, before the wall construction of the structure, the foundation treatment such as leveling and reinforcing of the foundation is performed, and the cushion concrete is poured as the bottom plate, and the structure is constructed on the basis of the cushion concrete, specifically, a construction template is set before the construction of the structure, and the following feasible scheme is adopted, the setting of the bottom construction template on the cushion concrete includes:
furthermore, putting a datum line on the cushion concrete, determining the installation position of the bottom construction template, connecting and fixing the bottom construction template through the support frame body, and testing and adjusting the bottom construction template to the design verticality.
The pressure under water is in direct proportion to the depth of water, the water pressure on the bottom of the cushion concrete and the bottom of the structure is the largest, and when the structure is a high pool wall structure, the water seepage phenomenon is easy to occur at the joint of the cushion concrete and the bottom of the structure. Therefore, the method is adopted to set the benchmark on the bottom concrete, and the bottom construction template is strictly arranged according to the benchmark line, so that the rigor of the subsequent concrete pouring construction can be improved, the structures such as construction joints and the like do not appear between the constructed structure and the bottom concrete, the integrity is good, and the water seepage prevention performance is higher.
Still further, in the construction form setting method disclosed in the above technical solution, since the number of the construction forms is several, and the continuous laying method is adopted for setting, the stability and the flatness of the adjacent construction forms need to be made to correspond to each other when laying, and a specific feasible solution is given here: the construction templates are provided with a plurality of layers from bottom to top, each layer of construction template is provided with an independent support frame body, the support frame body of the upper layer of construction template is erected on the support frame body of the lower layer of construction template, and the construction templates of the two adjacent layers of construction templates are reinforced and connected through reinforcing members. The effect of reinforcement is fixed upper and lower two-layer support body, and upper and lower two-layer construction formwork's relative stability is stronger, and the surface uniformity after the concrete construction shaping is better.
Further, in order to avoid slurry leakage during construction, the setting mode of the construction formwork is optimized, and the following specific feasible mode is given: when the construction formwork is installed, the sealing strips are arranged at the gaps of the adjacent construction formwork pieces. The sealing strip is made of flexible materials, and can fully fill transverse seams and longitudinal seams between construction templates to achieve the sealing effect.
Furthermore, the built-in fitting that discloses among the above-mentioned technical scheme is used for connecting fastening construction template, the built-in fitting include pre-buried pull rod, the both ends of pre-buried pull rod are provided with the screw thread and are connected with the cone, pre-buried pull rod both ends still are connected with the extension pull rod through the cone, pre-buried pull rod bury underground in the wall body after concrete placement, the extension pull rod be used for taut construction template and strut the support body. When concrete application, be provided with connect the via hole on the conical head, the conical head sets up the length behind the both ends of pre-buried pull rod and just in time equals the thickness of wall, and the narrow end of conical head is towards the concrete wall, and the wide end of conical head is towards the construction template, is provided with corresponding connecting hole on the construction template, and the connecting hole fastens with extending the pull rod cooperation.
Further, the built-in fitting setting is inside the concrete wall of pouring and has run through the concrete wall, for the effect of guarantee prevention infiltration, optimizes the structure of pre-buried pull rod, specifically, gives out following feasible scheme: the pre-buried pull rod on be provided with the stagnant water spare, the stagnant water spare cover is established on the pre-buried stay tube and the stagnant water spare is higher than pre-buried pull rod surface 2cm at least. When the water stop member is arranged, the hole where the embedded pull rod is located is sealed and blocked by the water stop member, and the connection position of the water stop member and the embedded pull rod is of a full-welding sealing structure, so that water can be prevented from permeating to the other side from one side of the wall through the embedded pull rod hole.
Further, because the wall of construction generally is high wall, set up construction formwork after, probably get into impurity and influence construction quality in the space of pouring, consequently need clear up in advance the space of pouring, optimize here and show following concrete and feasible scheme: and arranging a cleaning opening at the root of the wall construction formwork at intervals of a specified distance.
Furthermore, in order to ensure that the construction surface in the later stage is smooth and clean and avoid the surface degree of the concrete construction from being damaged in the form removal process, the following feasible technical schemes are provided: the construction formwork is coated with the release agent, and the release agent is coated before concrete pouring, so that the construction formwork can be dismantled in the later period more easily, and the surface of the concrete after mould dismantling is protected from being damaged.
Furthermore, the strict control of the concrete pouring and vibrating process is the key to improve the concrete pouring quality, and the optimization limitation is performed here, which includes the following concrete feasible schemes: and in the concrete pouring process, the height of the formed concrete per hour is less than or equal to 0.5 m.
And further, limiting the adopted concrete raw materials to realize a better construction effect, wherein the concrete raw materials are optimized and the following concrete feasible schemes are provided: and (3) blending the concrete by using slag cement of 42.5 or more grades.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the quantity and the positions of the embedded parts are reasonably set, so that the construction cost is reduced, and the construction quality is ensured; the conical heads at the two ends of the embedded pull rod and the extension pull rod can be detached and reused, so that the construction cost is further reduced; the construction molding is carried out through a continuous pouring mode, the anti-seepage requirement can be met, the tensioning of the construction formwork can be realized after concrete maintenance and formwork dismantling are carried out according to set conditions, the requirement that the construction reaches the surface degree is guaranteed, and the integral concrete quality after construction can be guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process diagram of the construction method.
Fig. 2 is a schematic structural diagram of an embedded part used in the embodiment.
The meaning of each reference number in the above figures is: 1. pre-burying a pull rod; 2. an extension pull rod; 3. a water stop member; 4. a conical head.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
Examples
Aiming at the phenomenon that the existing water treatment structure is easy to seep water after construction, the construction method is improved, and the seepage-proofing performance of the structure is improved; meanwhile, the construction cost can be reduced by adopting the improved construction method.
An MBBR water treatment process structure anti-seepage concrete construction method comprises the following steps:
s01: manufacturing and installing steel bars, and building an inner side installation rack and an outer side installation rack at the steel bars;
s02: manufacturing a construction template, and arranging a bottom construction template and a support frame body on the cushion concrete; installing the wall surface construction template on the installation frame body through hoisting;
s03: arranging a plurality of embedded parts on the steel bars and tensioning the wall construction template by the embedded parts;
the pre-buried pull rods are used as reinforcing members of the pool wall template and form a pool wall template system together with the reinforced main beams, the small beams, the templates and the like. Therefore, the quantity and the distribution mode of the embedded parts are obtained according to the checking calculation of the strength, the rigidity and the stability, and the calculation basis is 'building construction template safety technical specification' (JGJ 162-2008) 'concrete structure design specification' (GB 50010-20103) 'building structure load specification' (GB 50009-.
The method comprises the following specific steps: 1. determining engineering parameters: wall thickness, wall length, wall height, concrete strength grade.
| Name of newly-poured concrete wall | Pool wall | Wall thickness (mm) of newly-poured concrete wall | / |
| Calculated height of concrete wall (mm) | / | Calculated length of concrete wall (mm) | / |
2. And determining the load combination according to the technical Specification for building construction template safety JGJ 162-2008.
3. And (5) carrying out template combination design.
| Arrangement of trabeculae | Is vertical | Left template cantilever length (mm) | 50 |
| Trabecular spacing (mm) | 150 | Small beam one end cantilever length (mm) | 200 |
| Main beam interval (mm) | 400 | Cantilever length at one end of main beam (mm) | 100 |
| Horizontal spacing of split bolt (mm) | 200 | Vertical spacing of split bolt (mm) | 400 |
4. The panel checking calculation (1) intensity checking calculation (2) disturbance degree checking calculation.
5. Trabecula checking calculation (1), strength checking calculation (2), disturbance checking calculation (3) and support reaction force calculation.
6. And (3) checking the main beam (1), checking the strength (2) and checking the disturbance degree.
7. And (3) checking and calculating the axial tension of the split bolt (1).
After the checking calculation is finished, the calculated value can be compared with the designed value, and if the stress does not meet the checking calculation requirement, the template system needs to be correspondingly strengthened; if it is far below the design value, it is said to be satisfactory but uneconomical. The arrangement may be appropriately adjusted. And repeating the checking calculation again to meet the requirement of a design value and achieve the economic optimum.
S04: and (3) pouring concrete, namely, continuously pouring and tamping once, wetting and curing the concrete after the concrete is condensed, wherein the curing time is not less than the specified time, removing the formwork after the curing is finished, and the temperature difference between the surface temperature of the concrete and the environmental temperature is within the specified range during formwork removal. In some embodiments, the specified time may be set to 14 days and nights, with a specified temperature differential range of 15 ℃.
According to the construction method, the embedded parts are reasonably arranged to connect and fasten the construction template, construction molding is carried out in a continuous pouring mode, concrete curing and template dismantling are carried out according to set conditions, the construction template can be tensioned, the requirement of surface degree of construction can be met, and the integral concrete quality after construction can be guaranteed.
In the above technical solution, before the wall construction of the structure, the foundation treatment such as leveling and reinforcing of the foundation is performed, and the cushion concrete is poured as the bottom plate, and the structure is constructed on the basis of the cushion concrete, specifically, a construction template is set before the construction of the structure, and the following feasible scheme is adopted, the setting of the bottom construction template on the cushion concrete includes:
putting a datum line on the cushion concrete, determining the installation position of the bottom construction template, connecting and fixing the bottom construction template through the support frame body, and testing and adjusting the bottom construction template to the design verticality.
The pressure under water is in direct proportion to the depth of water, the water pressure on the bottom of the cushion concrete and the bottom of the structure is the largest, and when the structure is a high pool wall structure, the water seepage phenomenon is easy to occur at the joint of the cushion concrete and the bottom of the structure. Therefore, the method is adopted to set the benchmark on the bottom concrete, and the bottom construction template is strictly arranged according to the benchmark line, so that the rigor of the subsequent concrete pouring construction can be improved, the structures such as construction joints and the like do not appear between the constructed structure and the bottom concrete, the integrity is good, and the water seepage prevention performance is higher.
Among the construction template setting mode disclosed among the above-mentioned technical scheme, because construction template quantity is a plurality of, and adopts the mode of laying in succession to set up, need make the stability and the plane degree of adjacent construction template correspond each other when laying, this embodiment adopts a concrete feasible scheme: the construction templates are provided with a plurality of layers from bottom to top, each layer of construction template is provided with an independent support frame body, the support frame body of the upper layer of construction template is erected on the support frame body of the lower layer of construction template, and the construction templates of the two adjacent layers of construction templates are reinforced and connected through reinforcing members. The effect of reinforcement is fixed upper and lower two-layer support body, and upper and lower two-layer construction formwork's relative stability is stronger, and the surface uniformity after the concrete construction shaping is better.
In order to avoid the slurry leakage phenomenon in the construction process, the setting mode of the construction template is optimized, and the following specific feasible modes are given: when the construction formwork is installed, the sealing strips are arranged at the gaps of the adjacent construction formwork pieces. The sealing strip is made of flexible materials, and can fully fill transverse seams and longitudinal seams between construction templates to achieve the sealing effect.
Preferably, the sealing strip can be a sponge strip, the thickness of the sponge strip can be 5mm, the sponge strip is clamped by two adjacent construction templates, and meanwhile, the sealing strip can be sealed by a sealing adhesive tape.
The built-in fitting that discloses among the above-mentioned technical scheme is used for connecting fastening construction template, the built-in fitting include pre-buried pull rod 1, the both ends of pre-buried pull rod are provided with the screw thread and are connected with cone 4, pre-buried pull rod both ends still are connected with extension pull rod 2 through the cone, pre-buried pull rod bury underground in the wall body after concrete placement, the extension pull rod be used for taut construction template and strut the support body. When concrete application, be provided with connect the via hole on the conical head, the conical head sets up the length behind the both ends of pre-buried pull rod and just in time equals the thickness of wall, and the narrow end of conical head is towards the concrete wall, and the wide end of conical head is towards the construction template, is provided with corresponding connecting hole on the construction template, and the connecting hole fastens with extending the pull rod cooperation.
In some embodiments, the length of the embedded pull rod is 250mm, the diameter of the narrow end of the conical head is 30mm, and the diameter of the wide end of the conical head is 40 mm.
After construction, the extension pull rod and the conical head can be dismantled, and the extension pull rod is dismantled from the conical head by rotating the extension pull rod; the conical head needs to be dismantled by a sleeve tool, residual holes appear on the construction surface after the conical head is dismantled, and concrete prepared by cement of the same grade can be adopted for sealing.
The built-in fitting sets up inside the concrete wall of pouring and has run through the concrete wall, for the effect that the guarantee prevented the infiltration, optimizes the structure of pre-buried pull rod, specifically, cite as following feasible scheme: the pre-buried pull rod on be provided with stagnant water piece 3, stagnant water piece cover is established on the pre-buried stay tube and stagnant water piece is higher than pre-buried pull rod surface 2cm at least. When the water stop member is arranged, the hole where the embedded pull rod is located is sealed and blocked by the water stop member, and the connection position of the water stop member and the embedded pull rod is of a full-welding sealing structure, so that water can be prevented from permeating to the other side from one side of the wall through the embedded pull rod hole.
Preferably, a round thin sheet is arranged in the middle of the embedded pull rod and used as a water stop piece, the thickness of the thin sheet can be 3mm, and a steel plate is adopted. If the pool wall thickness of construction is great, the length of pre-buried pull rod is longer, can set up a plurality of stagnant water spare on pre-buried pull rod.
Because the wall of construction generally is high wall, set up construction formwork after, probably get into impurity and influence the construction quality in the space of pouring, consequently need pour the space and clear up in advance, optimize here and show following concrete feasible scheme: and arranging a cleaning opening at the root of the wall construction formwork at intervals of a specified distance. In some embodiments, the specified distance may be set to 10 m.
In order to ensure that the construction surface at the later stage is smooth and clean and avoid damaging the surface degree of concrete construction in the form removal process, the following feasible technical schemes are provided: the construction formwork is coated with the release agent, and the release agent is coated before concrete pouring, so that the construction formwork can be dismantled in the later period more easily, and the surface of the concrete after mould dismantling is protected from being damaged.
The process of strictly controlling concrete pouring and vibrating is the key for improving the concrete pouring quality, optimization and limitation are carried out, and the following specific feasible scheme is adopted in the embodiment: and in the concrete pouring process, the height of the formed concrete per hour is less than or equal to 0.5 m.
The adopted concrete raw materials are limited to realize better construction effect, and the optimization treatment is carried out and the following concrete feasible schemes are given as follows: and (3) blending the concrete by using slag cement of 42.5 or more grades.
The construction method is specifically explained in the above, and a specific construction case is illustrated here for explanation.
The south Ming river water environment comprehensive improvement project occupies 59.9 mu of land and has the total construction scale of 24.0 ten thousand meters3D, near term 3 km3And/d, implemented in stages. In the project, the high-efficiency sedimentation tank, the aeration grit chamber, the biochemical tank and the lift pump well are all of reinforced concrete structures, the height of each tank body is 5-10 meters, the high-efficiency sedimentation tank belongs to a high tank wall, the designed strength of concrete is C30, the anti-permeability grade is P6, and the process adopts advanced MBBR (biofilm reactor) water treatment technology in Norway.
Before construction, preparation work is carried out, when reinforcing steel bar manufacturing and installation, inner and outer frame erection, template support equipment acceptance and acceptance are carried out, and pouring is waited, the concrete consumption is planned and reported to a commercial mixing station in advance, a route is planned, corresponding mechanical equipment and machines are prepared, a concrete pouring standby scheme is prepared, and concrete pouring can be continuously poured.
The main materials required for construction are shown in table 1:
table 1 materials quantity table
| Serial number | Name (R) | Model number | Unit of | Number of |
| 1 | Sleeper | 160×240×2500 | m3 | 15 |
| 2 | Square wood | 140×140×600 | m3 | 200 |
| 3 | Three-section type split screw | φ14 | Root of herbaceous plant | 34830 |
| 4 | Bamboo plywood | 122cm*244cm*1.8cm | m2 | 5000 |
| 5 | Steel pipe | φ48mm | Ton of | 30 |
The main equipment required for construction is shown in table 2:
TABLE 2 Main implement and Equipment Meter
| Serial number | Name (R) | Model number | Unit of | Number of |
| 1 | Automobile delivery pump | HB60C | Table (Ref. Table) | 2 |
| 2 | Crane | 50t | Table (Ref. Table) | 2 |
| 3 | Self-unloading automobile | 15t | Table (Ref. Table) | 4 |
| 4 | Air compressor | 9m3 | Table (Ref. Table) | 1 |
| 5 | Electric saw | Table (Ref. Table) | 1 | |
| 6 | Electric planer | Table (Ref. Table) | 1 | |
| 7 | Plug-in vibrator | φ70mm/φ100mm | Table (Ref. Table) | Each 4 |
| 8 | Steel bar bender | 6mm～40mm | Table (Ref. Table) | 2 |
| 9 | Steel bar cutting machine | 6mm～40mm | Table (Ref. Table) | 2 |
| 10 | Transformer device | 400KVA | Table (Ref. Table) | 1 |
| 11 | Electric welding machine | Table (Ref. Table) | 5 | |
| 12 | Attached vibrator | Table (Ref. Table) | 2 |
In order to ensure the construction quality of concrete, the engineering templates all adopt wood templates so as to achieve the effect of fair-faced concrete. The support system adopts flitch, fastener formula scaffold frame, and split bolt position adopts double steel pipe to fix, and the split bolt adopts the impervious lead screw of syllogic, and the middle section adds steel-plastic cone and equals the wall thickness, and lead screw length at both ends is the support thickness sum such as template, steel pipe, flitch. The turnover frequency of the template of the main structure is not more than three times, if the corner is damaged in the turnover process of the template, the template can be reused only by treatment, the template which can not ensure the surface quality of concrete is discarded, the two end sections of the split bolt can be reused, and the material cost is saved.
The installation sequence of the bottom template is as follows: measuring and paying off, fixing points → assembling a template → adjusting elevation, straightening, supporting and fixing → binding bottom plate steel bars → installing a hanging mould of a reserved platform on the pool wall.
On the surface of the cushion concrete, a datum line for installing the template is put in by using an instrument, the template is placed and supported and fixed, and the verticality of the template is adjusted by attaching a horizontal ruler. The foundation is supported by a plywood suspended formwork with the thickness of 1.2cm, namely a wood formwork is fixed on a batten with the thickness of 8cm multiplied by 5cm, the batten is supported on a support system of a lower-layer formwork, then a steel pipe is used for reinforcement, and a steel pipe support frame is fixed on the wall of the foundation pit by the batten so as to prevent slippage.
Installing the pool wall template: according to the structure size and the concrete pouring level height, the template is installed and needs to be processed in advance in a wood processing room, and is installed and fixed in place on site; when the longitudinal and transverse plate seams are assembled, sealing strips are clamped between the seams and are parallel and level to the plate surface so as to prevent slurry leakage.
During field operation, after the binding of the steel bars is finished and the steel bars are qualified through acceptance, the supporting plate is started. And drilling holes on the templates at the two sides at corresponding positions. The templates are installed in a block mode, the templates on one side are erected and then simply fixed, split bolts meeting the wall thickness requirement are selected for assembly and are firmly arranged, the assembled bolts are placed into drilled template holes, then templates on the other side are supported, the bolts are aligned with the drilled holes to penetrate through the drilled holes and are temporarily fixed, and the like, when all the wall templates on one wall or a certain area are supported, unified reinforcement and correction are carried out, and the flatness and the verticality of the wall are guaranteed to meet the standard requirements.
When the embedded part is arranged before pouring, a final arrangement scheme is obtained through the calculation model, and the method specifically comprises the following steps:
1. establishing a template engineering model in a computer;
2. corresponding parameters are set in the model, so that the model can achieve the simulation effect equivalent to the actual simulation effect;
3. carrying out design checking calculation according to the set parameters, and simulating and verifying whether the construction effect meets the safety requirements or not;
4. carrying out scheme optimization according to the result of checking calculation, and repeating the step 3 until the model can meet the safety requirement;
5. and determining a design scheme and generating an actual setting scheme.
In the construction, the pool wall is poured once, and the template is directly located on the bottom plate. The pool wall template is bound by reinforcing steel bars and embedded in various ways, the embedded parts are installed after being installed and fixed, and a sealing strip is added between the surface of the pool wall reservation station and the template to prevent slurry leakage. The vibration time is required to be controlled during concrete vibration, the concrete is quickly inserted and slowly pulled, and the expansion or leakage vibration caused by over vibration is avoided. The concrete is poured in different layers and sections, and the concrete of the lower section is required to be poured in different sections before the initial setting of the concrete of the previous section, so that the pouring continuity is ensured.
In order to ensure the smooth finish of the wall and easy form removal, the template must be coated with a release agent before installation, and the release agent needs to be uniformly coated. Meanwhile, in order to better clean sundries in the formwork, cleaning openings are arranged at the root of the formwork of the pool wall every 10 m. And sponge strips with the thickness of 5mm are clamped at the splicing positions of the templates so as to ensure that the splicing seams of the templates are tight and do not leak slurry.
And 4cm thick square timbers are additionally arranged at the positions where all the supports are in direct contact with the soil body, so that the support system is prevented from sinking.
When concrete pouring is carried out, concrete of the foundation and the side wall of each structure is poured by using an automobile pump. A pump is additionally prepared on a construction site for standby, so that the phenomenon of overtime of the connection caused by the casting interruption due to mechanical failure is prevented. When wall body concrete pouring, separate suitable distance on the wall and set up a baiting bucket, during the pouring concrete strict control every hour shaping concrete height is not more than 0.5m, and the job site is stored at any time along with the pouring progress and is equipped with reserve concrete, prevents to cause because of problem concrete supplied materials untimely and appear adjacent two-layer overtime problem of connecing. After concrete is concreted, the strength of the concrete does not reach 1.2N/mm2The vibration is prohibited and no external force is applied to the vibration.
And analyzing reasons aiming at problems possibly encountered during concrete pouring, and finding out a countermeasure to ensure that the concrete pouring is carried out smoothly. The table of countermeasures is shown in table 1:
TABLE 1 concrete construction guarantee strategy table
Curing the concrete immediately after the concrete is solidified, and keeping the concrete fully wet, wherein the curing time is not less than 14 days and nights, and the temperature difference between the surface temperature of the pool wall and the ambient temperature is not more than 15 ℃ during the stripping.
And when the strength of the concrete meets the formwork removal requirement, the formwork is removed. When the form is removed, the external tie bolts are removed, collected and stacked on the upper part of the foundation pit, so that the condition that the use is influenced by damage during the form removal is avoided. And after the bolts are cleaned, the template starts to be detached, the detached template is cleaned, and then the conical head is detached. The surface of the constructed water-stopping bolt is kept clean and is not washed by rainwater, so that the rusting and dismantling of the conical head is prevented, and the conical head is inserted into the conical head for dismantling by using a standard sleeve.
The method disclosed in the embodiment is adopted in the construction project, and the following beneficial effects are achieved:
1. the template is reinforced by adopting the three-section combined tool type water-stopping split bolt, the template loss rate is reduced, large-area one-step demolding can be realized, and the time cost is reduced; the pull rods at the two ends and the conical heads can be repeatedly utilized, so that the resources can be effectively saved, the energy is saved, the environment is protected, the cost expenditure is reduced, and the construction cost is reduced.
2. The novel steel plug is utilized, the pull rod almost has no leak point, and the post-processing work is reduced.
3. The strength is determined by modeling with secure computing software, reducing a large number of replication computing processes. And the process management is strengthened, and the time and the cost for plugging the leakage point at the later stage are reduced.
4. Taking the number of the water stopping pull rods used by the structure of the water pool of the treatment plant as an example, the total number of the pull rods used is 34830.
The purchase price of the traditional water stop screw is 4.2 yuan +1 yuan (equal price and adoption)
The model of the middle water stop plate is 100 x 3, the wall thickness is mainly 600 yuan, and the rubber cushion block is 0.5 yuan/yuan), and the labor cost is 6.1 yuan. The water-stopping pull rod in the factory needs the cost of(4.2+1+6.1) × 34830 ═ 393579 yuan.
The middle section of the novel water stop screw is 2.2 yuan, the pull rods at two ends are 1.4 yuan (all calculated by 600 wall thickness, the total length of the water stop pull rods is wall thickness +50cm), and the steel-plastic conical head is 0.7 yuan/one. The novel later-stage reduction process of the steel-plastic conical head comprises the following steps: and (5) manually cutting and digging the hole. Therefore, the difference of labor cost is 4.36 yuan. The pull rods at two ends of the novel steel-plastic conical head screw and the steel-plastic conical head can be repeatedly utilized and are spread for four times. The cost of the novel water-stop pull rod in the factory area is 2.2 × 34830+ (34830/5 × 1.4+1.4)) +4.36 × 34830 ═ 247989.6.
The direct cost of the screw with the novel steel-plastic conical head is saved by 393579-247989.6 Yuan 145589.4 Yuan.
Therefore, the construction method has excellent construction effect and economic benefit.
The present invention is not limited to the above-described alternative embodiments, and various other embodiments can be obtained by those skilled in the art from the above-described embodiments in any combination, and any other embodiments can be obtained in various forms while still being within the spirit of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (10)
1. An MBBR water treatment process structure anti-seepage concrete construction method is characterized by comprising the following steps:
manufacturing and installing steel bars, and building an inner side installation rack and an outer side installation rack at the steel bars;
manufacturing a construction template, and arranging a bottom construction template and a support frame body on the cushion concrete; installing the wall surface construction template on the installation frame body through hoisting;
arranging a plurality of embedded parts on the steel bars and tensioning the wall construction template by the embedded parts;
and (3) pouring concrete, namely, continuously pouring and tamping once, wetting and curing the concrete after the concrete is condensed, wherein the curing time is not less than the specified time, removing the formwork after the curing is finished, and the temperature difference between the surface temperature of the concrete and the environmental temperature is within the specified range during formwork removal.
2. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, wherein the setting of a bottom layer construction template on the cushion concrete comprises:
putting a datum line on the cushion concrete, determining the installation position of the bottom construction template, connecting and fixing the bottom construction template through the support frame body, and testing and adjusting the bottom construction template to the design verticality.
3. The MBBR water treatment process structure anti-seepage concrete construction method of claim 2, which is characterized in that:
the construction templates are provided with a plurality of layers from bottom to top, each layer of construction template is provided with an independent support frame body, the support frame body of the upper layer of construction template is erected on the support frame body of the lower layer of construction template, and the construction templates of the two adjacent layers of construction templates are reinforced and connected through reinforcing members.
4. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
when the construction formwork is installed, the sealing strips are arranged at the gaps of the adjacent construction formwork pieces.
5. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
the embedded part include pre-buried pull rod (1), the both ends of pre-buried pull rod are provided with the screw thread and are connected with cone (4), pre-buried pull rod both ends still are connected with extension pull rod (2) through the cone, pre-buried pull rod bury underground in the wall body after concrete placement, the extension pull rod be used for taut construction formwork and strut the support body.
6. The MBBR water treatment process structure anti-seepage concrete construction method of claim 5, which is characterized in that:
the pre-buried pull rod on be provided with stagnant water spare (3), stagnant water spare cover is established on the pre-buried stand pipe and stagnant water spare is higher than pre-buried pull rod surface 2cm at least.
7. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
and arranging a cleaning opening at the root of the wall construction formwork at intervals of a specified distance.
8. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
and the construction template is coated with a release agent.
9. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
and in the concrete pouring process, the height of the formed concrete per hour is less than or equal to 0.5 m.
10. The MBBR water treatment process structure anti-seepage concrete construction method of claim 1, which is characterized in that:
and (3) blending the concrete by using slag cement of 42.5 or more grades.
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| CN202011422822.0A CN112593749A (en) | 2020-12-08 | 2020-12-08 | Construction method of anti-seepage concrete of MBBR water treatment process structure |
| AU2021105980A AU2021105980A4 (en) | 2020-12-08 | 2021-08-19 | Construction method for impervious concrete for mbbr water treatment process structure |
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| CN114991498A (en) * | 2022-04-23 | 2022-09-02 | 中国五冶集团有限公司 | Method for positioning and fixing embedded steel plates on outer sides of walls and beams of concrete structures |
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