CN113980398A - Ethylene propylene diene monomer rubber and method for casting electric power channel in one step by adopting ethylene propylene diene monomer rubber - Google Patents
Ethylene propylene diene monomer rubber and method for casting electric power channel in one step by adopting ethylene propylene diene monomer rubber Download PDFInfo
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- CN113980398A CN113980398A CN202111284293.7A CN202111284293A CN113980398A CN 113980398 A CN113980398 A CN 113980398A CN 202111284293 A CN202111284293 A CN 202111284293A CN 113980398 A CN113980398 A CN 113980398A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention discloses ethylene propylene diene monomer rubber and a construction method for pouring an electric power ditch at one time by utilizing the rubber and a telescopic template bracket, wherein an ethylene propylene diene monomer rubber water stop strip comprises 100 parts of ethylene propylene diene monomer rubber, 32-35 parts of carbon black, 20-25 parts of paraffin and 2-4 parts of sulfur; 15-30 parts of light calcium carbonate, 0.5-1.2 parts of an accelerator and 1-2 parts of stearic acid, wherein the construction method comprises 1) binding steel bars; 2) constructing a template; 3) constructing a deformation joint; 4) pouring and vibrating concrete; 5) backfilling a foundation pit; adopting one-time binding of reinforcing steel bars, one-time processing and mounting of templates; the formwork support is adopted for supporting the interior of the formwork, the support is a telescopic formwork support, one-time pouring of the electric power ditch is achieved, and the mode that reinforcing steel bars are bound twice originally, formwork is erected twice, concrete is poured twice, and the mode that the reinforcing steel bars are bound twice is simplified into one time. The large template is adopted without leaving construction joints, and the ethylene propylene diene monomer embedded and externally attached rubber waterstops are adopted in deformation joints, so that the water penetration and seepage preventing capability of the power ditch is improved, and the structural integrity is enhanced.
Description
Technical Field
The invention belongs to the technical field of ethylene propylene diene monomer waterproof materials and the technical field of municipal engineering cast-in-place power ditch construction, and particularly relates to a method for pouring a power ditch at one time by adopting ethylene propylene diene monomer and a telescopic bracket.
Background
The municipal electric power ditch is a flat cable tunnel constructed by combining steel bars and concrete, and the tunnel consists of one or more square, rectangular or circular sections. During construction, a plurality of construction sections are divided into a plurality of construction sections for flow construction, and each section of electric power ditch main project is divided into three sub projects of reinforcing steel bars, templates and concrete.
At present, in the construction process of the concrete of the electric power ditch main body with the rectangular cross section, two-time pouring forming is a conventional method which is used for many years, and a horizontal construction joint is reserved on a side wall by two-time pouring of the concrete and is generally arranged at a position 200mm above an axillary corner of a bottom plate. The water resistance and impermeability of the electric power ditch are important indexes influencing the service life and the use safety of the electric power ditch, and in the current engineering construction, in order to prevent water seepage, a water stop belt is mainly embedded in a side wall construction joint. The water stop method is used for water prevention, but with the increase of service life, the phenomena of water stop aging and the like are serious, the water prevention performance is reduced, and potential safety hazards are brought.
Meanwhile, the main construction process of the conventional two-time pouring of the concrete of the rectangular electric power trench mainly comprises the following working procedures according to three project divisions:
(1) and (5) twice processing and binding of the reinforcing steel bars. The concrete is that the steel bars are processed and molded according to design drawings and two times of binding and overlapping sizes and then are transported to a construction site, the steel bars at the lower parts of the bottom plate and the side wall of the electric power ditch are firstly bound, and after the templates below the central lines of the bottom plate and the water stop belts of the side wall are installed, concrete is poured for molding. And binding the upper part of the side wall of the power ditch and the top plate steel bars after the template is removed. The original through-length side wall main reinforcement is required to be connected after being cut off, so that the reinforcement joint treatment is increased, the workload is increased, the construction period is prolonged, and the construction cost is increased.
(2) And (4) twice processing and mounting of the template. Taking a wood template and a steel plate waterstop as an example, after the template is processed and molded according to the geometric dimension of the electric power ditch twice concrete pouring molding in a wood shed, the wood shed is transported to a construction site, the electric power ditch bottom plate, the template and the waterstop below the central line of the side wall waterstop are firstly installed, after the concrete of the side wall below the central line of the electric power ditch bottom plate and the waterstop is poured and molded, the template is detached, and after the side wall and the top plate steel bar are bound, the upper part of the side wall of the electric power ditch and the top plate template are installed. This in-process needs to be cut into little template with the monoblock big template originally, and the short flitch is sawed into to the long flitch, has shortened the life of template, has wasted the material, and the template is twice installed, is demolishd the turnover utilization ratio that has reduced the template, has increased the waterstop, has improved engineering cost.
(3) And (5) pouring the concrete twice. The method comprises the steps of pouring concrete below the central line of the bottom plate and the water stop belt of the electric power ditch for the first time, timely arranging workers to scabble the joint surface (horizontal construction joint of the side wall) of the concrete poured for the second time after the concrete is initially set, removing the reinforcing steel bars on the upper part and the top plate of the side wall of the electric power ditch after the templates are bound, and pouring concrete on the side wall and the top plate of the electric power ditch after the templates of the side wall and the top plate are installed. A horizontal construction joint is reserved in the process, so that the integrity of the electric power ditch is influenced, the joint surface of the construction joint concrete is roughened and cleaned, and the secondary preparation of manpower, materials and mechanical equipment for concrete pouring is realized, the workload is increased, and the construction period is prolonged.
The conventional construction method for twice pouring the concrete of the rectangular electric power trench can be expressed as follows according to the sequence of construction: eight construction processes of binding the bottom plate, the side wall steel bars to the lap joint position → installing the bottom plate, the side wall formwork below the central line of the water stop, the water stop → pouring the bottom plate, the side wall concrete below the central line of the water stop → maintaining and stripping → binding the upper part of the side wall, the top plate steel bars → installing the side wall, the top plate formwork → pouring the side wall, the top plate concrete → maintaining and stripping are complicated and complicated in process. Meanwhile, in the process, the waterproof strip is not used and installed properly, the service life is short, and the waterproof performance and the safety of the electric power ditch are also seriously influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for pouring the electric power ditch at one time by adopting ethylene propylene diene monomer and a telescopic bracket. Secondly compress into originally loaded down with trivial details eight work progress: and (3) steel bar binding → template installation → concrete pouring → maintenance and form removal, so that the construction efficiency is greatly improved, the engineering quality is improved, and the investment is saved.
The complete technical scheme of the invention comprises the following steps:
the ethylene propylene diene monomer rubber water stop strip at least comprises 100 parts of ethylene propylene diene monomer rubber, 32-35 parts of carbon black, 20-25 parts of paraffin and 2-4 parts of sulfur; 15-30 parts of light calcium carbonate, 0.5-1.2 parts of an accelerator and 1-2 parts of stearic acid by weight.
And the surface of the ethylene propylene diene monomer rubber water stop strip is provided with a bonding layer.
The construction method for pouring the electric power ditch at one time by utilizing the ethylene propylene diene monomer water stop strip and the telescopic template bracket is characterized in that the ethylene propylene diene monomer water stop strip is used for deformation joint construction, and the ethylene propylene diene monomer water stop strip comprises a middle-buried rubber water stop band and an external-pasted rubber water stop band.
The method specifically comprises the following steps:
1) binding of reinforcing steel bars
The method comprises the following steps of (1) adopting one-time binding of reinforcing steel bars, popping up side (middle) wall lines on a cushion layer before binding, determining the positions of two rows of upright rods according to the dimension width of an outer package of the reinforcing steel bars of the power channel, and erecting a double-row multi-upright-rod type steel pipe fastener type scaffold to form temporary support of main reinforcing steel bars and a worker operation platform during binding of the reinforcing steel bars; then drawing position lines of main ribs and erection ribs on the cushion layer and the fixed scaffold steel pipes, and performing splayed buckle binding, welding or mechanical connection after the main ribs, the erection ribs and the stirrups are placed according to the position lines; after finishing, adding a protective layer and dismantling the scaffold; welding points or oblique fixed steel bars are additionally arranged at the four rib angle positions of the electric power ditch steel bar framework according to proper distances before the scaffold is dismantled;
2) formwork construction
The template construction process adopts a mode of one-time processing and template installation; wherein, the inner and outer moulds are both made of wood templates, self-adhesive double-sided sponge strips are adhered to the template seams, the inner surface of the template is smooth and flat, and a release agent is coated before use;
the template construction structure is as follows: the top part comprises a top plate template and a top plate, the side surface comprises a side wall template, a side wall and a side wall template support which are sequentially arranged from inside to outside, the side wall template support is triangular, the sectional area is sequentially increased from top to bottom, and the bottom part comprises a bottom plate;
the interior of the template is supported by a template support, the support is a telescopic template support and comprises a template support middle cross brace, a template support top cross brace and a template support vertical brace, the template support vertical brace is arranged in a vertical and oblique mode and forms a triangular stable structure with the template support top cross brace and the template support middle cross brace; the support is preassembled, wherein the top ends of two adjacent template support vertical supports are hinged by the support, and two sides of the support are provided with template support top transverse supports;
3) deformation joint construction
The deformation joint construction comprises presetting a middle-buried rubber waterstop and an external-attached rubber waterstop;
the middle embedded rubber waterstop and the external attached waterstop are arranged in a surrounding mode along the bottom plate, the side wall and the top plate; the middle-buried rubber waterstop is constructed in sequence according to the sequence of the bottom plate, the side wall and the top plate, and the external-pasted rubber waterstop comprises the installation of the bottom plate waterstop and the installation of the side wall waterstop;
4) concrete pouring and vibrating
The concrete pouring and vibrating are one-time pouring concrete, the concrete pouring is from bottom to top, the bottom plate is poured firstly, then the side walls are poured, and then the top plate is poured; pouring and vibrating the bottom plate from a low position to a high position in a layered manner according to the width of the electric power ditch, and performing covering maintenance after concrete pouring, vibrating and surface collection are finished; and removing the template and the bracket after the template removal strength is reached.
In the step 4), after the template and the support are removed, the steel pipe supporting holes on the floor are filled with waterproof concrete with the same strength; and curing the concrete within 12 hours after the concrete is poured, wherein the plane concrete is cured by a method of covering a plastic film or spraying water on a geotextile, and the vertical concrete is cured by spraying water or a curing agent.
The method also comprises the step 5) of foundation pit backfilling, wherein the foundation pit backfilling is realized by adopting an excavator, and manual matching with machinery is adopted for layered symmetrical backfilling and tamping and compacting by a road roller; when backfilling, small machines are used for tamping in the backfilling thickness of 500mm on the structural top plate and around the pipeline, and the overlapping between the tamps is not less than 1/3 rammed bottom width.
Backfilling with 3% cement stone chips to 500mm above the top plate of the electric power ditch, uniformly and symmetrically performing backfilling construction, and tamping in layers;
the thickness of each layer is not more than 250mm by manual compaction, and the thickness of each layer is not more than 300mm by mechanical compaction.
Compared with the prior art, the invention has the advantages that:
1. through reasonable ethylene propylene diene monomer rubber sealing strip component design, the sealing strip with good weather resistance and high strength performance is obtained, the service life is greatly prolonged, and meanwhile, due to the design of the telescopic template support, the one-time pouring of the electric power ditch is realized, the construction joint is eliminated, and the waterproof effect and the safety of the electric power ditch are improved remarkably comprehensively.
2. Two-time pouring is changed into one-time pouring molding, so that the construction process is simplified, the construction period is shortened, and the cost is saved.
3. Through the design of the whole reasonable construction process, construction requirement and parameters, the structure form is optimized, the maintenance is convenient, and the maintenance cost is saved. The overall stability is improved.
4. The template is erected quickly, so that time and cost are saved.
Drawings
Fig. 1 is a schematic view of one-time casting construction of the present invention.
FIG. 2 is a schematic plan view of the holder;
fig. 3 is a perspective view of the stand.
Fig. 4 is a further plan view of the stent.
In the figure: 1-top plate formwork, 2-top plate, 3-side wall formwork, 4-side wall, 5-side wall formwork support, 6-bottom plate, 7-formwork support middle cross brace, 8-support hinge, 9-support rotating shaft structure connection, 10-formwork support top cross brace and 11-formwork support vertical brace.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only illustrative and are not intended to limit the present application.
In the embodiment, in order to shorten the construction period and improve the integrity and the waterproof and impervious performance of the structure, the concrete is poured continuously from one end to the other end by adopting a one-step pouring forming method. The method is characterized in that a longitudinal segmentation and vertical layering construction mode is adopted during pouring, the length of the longitudinal segmentation is divided into pouring sections according to 30m in principle, bottom plate concrete and a 30 cm-high wall body are poured in each section, and then the rest wall body and the top plate are poured.
The general flow of the construction process of the cast-in-situ electric power ditch comprises the following steps:
firstly, leveling the site → IV type Larsen steel plate pile enclosure → foundation pit dewatering → support installation → foundation pit excavation → cushion layer + waterproof and protective layer → seventh colligation steel bar → installing template → pouring concrete → curing and removing mould → red mud and blue mud
Backfill soil →
Demolition support →
And (4) removing the section steel.
The cast-in-situ electric power ditch supporting process flow and the supporting form are as follows:
positioning and paying off the position of the steel sheet pile → primarily excavating a foundation trench → constructing and driving the steel sheet pile → excavating and backfilling a foundation pit → pulling out the steel sheet pile → treating a pile hole.
The construction scheme of the cast-in-place power ditch structure in the embodiment is specifically described as follows:
1) binding of reinforcing steel bars
The mode of processing and binding the reinforcing steel bars at one time is adopted. The processing process of the reinforcing steel bar comprises the following steps: according to construction drawing electric power ditch cross section size to the convenient prerequisite of reinforcing bar transport ligature, to electric power ditch main part reinforcing bar system serial number, carry out whole unloading length calculation and compile reinforcing bar batching list to carry out machine-shaping according to the shape and size in the batching list.
The steel bar binding process comprises the following steps: side (middle) wall lines are popped out on the cushion layer before binding, the positions of two rows of upright rods are determined according to the dimension width of the outer package of the electric power ditch reinforcing steel bars, and a double-row multi-upright-rod type steel pipe fastener type scaffold is erected to form a temporary support of main reinforcing steel bars and a worker operation platform during binding the reinforcing steel bars. And then drawing position lines of the main ribs and the erection ribs on the cushion layer and the fixed scaffold steel pipes, and performing splayed buckle binding, welding or mechanical connection after the main ribs, the erection ribs and the stirrups are placed according to the position lines. And (4) after finishing, adding a protective layer and dismantling the scaffold.
Because the electric power ditch reinforcing bar carries out disposable processing, ligature height, dead weight are big, need bear a lot of construction load again when installing the template, pouring concrete. The invention designs that welding points or oblique fixed steel bars are additionally arranged at the four rib angle positions of the electric power ditch steel bar framework according to proper distances before the scaffold is dismantled. The integral rigidity of the steel reinforcement framework is enhanced, deformation and toppling are avoided, and the safety of the construction process is improved.
2) Formwork construction
In the embodiment, the template construction process adopts a mode of processing and installing the template at one time. The inner and outer moulds are both made of wood templates, self-adhesive double-sided sponge strips are adhered to the template seams, the inner surface of the template is smooth and flat, a release agent is coated before the template is used, and the template is erected vertically and smoothly without bulging and stubble staggering.
The invention adopts the novel retractable template bracket to realize one-time integral casting of a cast-in-place concrete structure, which is the most important invention point of the invention, the novel template bracket can freely extend and retract horizontally and vertically on the cross section of a vertical construction tunnel on the premise of ensuring the strength and stability of the novel template bracket through a mechanical connection structure (comprising a hinge, a rotating shaft, a buckle device and the like), the time for erecting the template bracket in the construction process can be greatly shortened, the labor is saved, the cost is reduced, and the safety is improved, so that the original construction method of casting twice and reserving construction joints is changed by adopting the construction method of binding steel bars once, erecting templates once and casting concrete once without reserving the construction joints.
The construction structure is as shown in figure 1, and the top includes roof template 1 and roof 2, and the side includes lateral wall template 3, lateral wall 4 and the lateral wall formwork support 5 that sets gradually from inside to outside, lateral wall formwork support 5 is triangle-shaped, and the sectional area from top to bottom increases in proper order to improve stability. The bottom comprises a bottom plate 6.
Novel retractable template support structure is as shown in fig. 2~4, including stull 7 in the template support, template support top stull 10 and template support erects to prop 11, template support erects to prop 11 for erecting the slant setting, and template support top stull 10 and template support in stull 7 form triangular stable structure. The support adopts the pre-assembly formula, and wherein 11 tops of two adjacent template support erects to prop and adopt the articulated 8 connection of support to set up template support top stull 10 in its both sides, at the support middle part, adopt support pivot structure 9 to connect stull 7 in the template support in the middle of two template support erects to prop 11, template support erects 11 bottoms and sets up flexible gyro wheel, the convenient removal.
The strength and the structure of the template and the support need to calculate the bearing capacity, the rigidity and the stability of the template and the support before use, and the actual construction process finds that the stress applied to a vertical support by a top structure borne by a cross support 7 in the template support can ensure the deformation resistance stability of the whole support structure, the structure of the middle cross support needs to be specially designed, after theoretical calculation through engineering mechanics, the method is verified with an actual result, parameters with low relevance in actual application are removed, and the following design mode is adopted:
wherein D1Wall thickness of steel tube as a wale in formwork support, D0The wall thickness of the steel pipe of the vertical support of the formwork support, alpha is the included angle between the two vertical supports of the formwork support, alpha0The reference angle is 30 degrees in the present invention. Wherein the angle between the vertical braces is determined according to the shape of the tunnel and the construction requirements, and the vertical braces and the top cross braces adopt
And calculating the required wall thickness of the middle cross brace steel pipe according to the included angle alpha determined by the construction requirement. The bending strength and the shearing strength of the whole bracket can be obviously improved, and the stability of the construction process is ensured.
3) Deformation joint construction
In the embodiment, the deformation joint construction needs to preset a middle-buried rubber water stop and an external-attached rubber water stop. The rubber waterstop adopts an ethylene propylene diene monomer rubber waterstop. The ethylene propylene diene monomer rubber water stop strip at least comprises 100 parts of ethylene propylene diene monomer rubber, 32-35 parts of carbon black, 20-25 parts of paraffin and 2-4 parts of sulfur; 15-30 parts of light calcium carbonate, 0.5-1.2 parts of an accelerator and 1-2 parts of stearic acid by weight. The components are put into an internal mixer according to the weight ratio for mixing, filtering and removing impurities, the open mill is used for radiating heat, and an accelerant is added, and then the mixture is secondarily mixed with sulfur, and the open mill is used for radiating heat to obtain the catalyst.
The middle embedded rubber waterstop and the external attached waterstop are arranged in a surrounding mode along the bottom plate, the side wall and the top plate; when entering the field, the material is verified by name, specification, model, quantity, weight, appearance, thickness, qualification certificate, quality assurance certificate and the like, and is sampled and inspected according to design drawings and specification rules, and the qualified material is used after being supervised and confirmed.
The construction method comprises the following steps:
middle buried rubber water stop
The construction is under construction according to the order of bottom plate, side wall, roof in proper order, wherein:
firstly, the bottom plate deformation joint water stop belt is transversely installed, no joint is left, and the joint is left at a position 1m away from the outer wall of the top plate. The side wall deformation joint water stop is installed in a mode of pulling from bottom to top, and is fixed in a segmented mode.
And secondly, the buried water stop is installed in parallel to the vertical steel bars of the shear wall without a joint and is the same as the bottom plate deformation joint.
And thirdly, transversely installing the deformation joint water stop belt of the top plate, and reserving two joints to be connected with the bottom plate and the side wall deformation joint water stop belt.
The connecting process flow of the buried rubber waterstop is as follows:
material preparation → grinding joint → purging and cleaning → painting glue → airing for 10 minutes → bonding and pressing → drilling rivets on both sides of the steel edge → sealing end by glass cement → acceptance inspection.
The connection operation of the rubber water stop requires that:
② after the polishing, clean cotton cloth is needed to be used for wiping, and a blower is used for auxiliary blowing.
The thickness of the coating glue is controlled to be 0.08-0.15mm, the total glue amount is 200-.
Thirdly, airing for 10 minutes after gluing to ensure that the solvent is completely volatilized, increase the viscosity and promote the solidification, and immediately adhering when the glue layer is in a dry film shape. Solves the problem that the adhesive quality is reduced because the adhesive layer is sticky or generates bubbles when the adhesive layer is immediately laminated in the prior art. Or the adhesive layer loses viscosity and the adhesive strength is influenced due to too long air-drying time.
Fourthly, the positions are aligned at one time during bonding, the back and forth movement cannot be caused, after bonding, the pressing, hammering or rolling is carried out properly to drive away air, the glue layer is compacted, and the bonding quality is improved.
Fifthly, the effective length of the joint lapping and bonding is not less than 300mm, two rows of rivets are arranged on the steel edges at two sides for fixing, glass cement is arranged on the inner side of the steel edge before anchoring, then riveting is carried out, and the periphery is sealed by the glass cement.
The installation process flow of the bottom plate rubber waterstop is as follows:
cleaning a base layer → installing an inner side support steel bar at a deformation joint → installing and fixing an inner side lower layer wood formwork support → installing a rubber water stop band → installing and fixing an inner side upper layer wood formwork support → pouring and maintaining concrete.
The operation key points and the technical requirements are as follows:
clearing a base layer: and cleaning up the wastes such as concrete scraps, welding slag and the like.
Secondly, the wooden template support is fixedly installed and supported by using sleeper beam steel bar anchor flukes.
And thirdly, punching holes at a position 10mm away from the edges of the steel edges at two sides of the water stop belt at an interval of 1m for ensuring that the rubber water stop belt is installed horizontally and vertically, and fixing the rubber water stop belt by using iron wires and steel bars.
And joints cannot be reserved on the bottom plate and the outer side wall deformation joint water stop belts.
And fourthly, the rubber waterstop for the side wall deformation joint must be effectively connected with the bottom plate deformation joint.
The side wall rubber waterstop installation process flow is as follows:
and (3) mounting the steel bars of the inner side support at the deformation joint → mounting the water stop band → mounting and fixing the outer side wood formwork support → pouring concrete.
The operation key points and the technical requirements are as follows:
controlling the vertical verticality of the water stop belt: the length of the middle side wall water stop is calculated in advance, the lap joint position is measured, and the middle side wall water stop is fixed on the reinforcing steel bars through iron wires in advance. Avoid the middle fold of the water stop belt and the unevenness of the convex and concave.
The installation process flow of the top plate rubber waterstop comprises the following steps:
installing the steel bars of the inner side support at the deformation joint → installing the rubber water stop → installing and fixing the outer side wood formwork support → pouring concrete.
The operation key points and the technical requirements are as follows:
firstly, 2 connectors can be reserved in the water stop belt of the deformation joint of the top plate and are respectively positioned at the position 1m away from the outer wall edge of the top plate.
And secondly, calculating the connecting position of the side wall water stop and the top plate water stop in advance, and polishing and blowing the top plate water stop.
External-sticking rubber waterstop
Installation of the bottom plate water stop: and (3) outwards extending the outer sides of the two water stop belts by 200mm on the concrete cushion layer, adhering ethylene propylene diene monomer waterproof coiled materials with the thickness of 3mm between the two water stop belts (the coiled materials are adhered on the cushion layer and need to be firm), and then firmly adhering the rubber water stop belts with the rubber water stop belts by using 401 waterproof glue.
Installation of side wall waterstops: a30 mm thick wood template is matched with the back of the water stop at the position of the outer wall where the water stop is required to be installed, the width and the length of the wood template meet the requirement of installing the water stop, and the wood template and a basement outer wall integral template (a steel mould, a bamboo mould and the like) are connected into a whole so as to prevent the wood template from shifting, leaking grout and losing the water stop function when concrete is poured. And simultaneously fixing the externally attached rubber waterstop with the wood template by using double-cap nails (the double-cap nails are nailed at the edge parts of the two sides of the waterstop and are nailed one by one at intervals of 200 mm). The installed water stop should be flat and smooth without sagging. After the concrete is poured on the part, the strength of the concrete reaches more than 80% of the designed strength, the mould can be removed, and the coiled material waterproof layer is adhered after the mould is removed.
4) Concrete pouring and vibrating
And (4) pouring concrete at one time, wherein the concrete is commercial concrete. The slump of the concrete should be strictly controlled according to the design requirements, and is generally preferably 30-50 mm. The concrete is poured on site, a concrete pump truck is adopted for distributing the material, the mobility is good, the movement is convenient, and the concrete can be directly and accurately delivered to a pouring position. An electric flexible shaft plug-in vibrator is adopted. The concrete is poured from bottom to top, and the bottom plate is poured first, then the side (middle) wall is poured, and then the top plate is poured. The bottom plate pouring is carried out in a layered pouring and vibrating mode from a low position to a high position according to the width of the electric power ditch, the pouring is carried out in two layers at constant speed and continuously according to the thickness, and construction joints are not left. The side (middle) wall is the key point of concrete pouring, and the side wall pouring is carried out in a layered mode according to the sequence of an outer wall, a middle wall and another side wall. The thickness of the layer depends on the active length of the vibrator, and is typically 500 mm. The vibration is orderly carried out according to the layer by positioning and fixing people, and the vibration leakage is avoided. The pouring speed is uniform and is not suitable to be too fast, the concrete of the previous layer is poured after the concrete of the next layer is vibrated and slightly precipitated, and the pouring is stopped in the middle when necessary according to the collapse degree and the wall height, but the pouring is not suitable to be too long. In order to ensure the structural integrity, the pouring of the concrete of the previous layer is carried out before the initial setting of the concrete of the next layer. And pouring the top plate immediately after the side wall concrete pouring is finished. The pouring method is similar to the floor. And (5) performing covering maintenance after concrete pouring, vibrating and surface collection are finished. And removing the template and the bracket after the template removing strength is reached. The steel pipe supporting holes on the floor are filled with waterproof concrete with the same strength, so that water seepage is prevented. Curing the concrete within 12 hours (the temperature can be prolonged when the temperature is lower) after the concrete is poured, arranging a special person for plane concrete to perform curing by adopting a method of covering a plastic film or spraying water on geotextile, curing the vertical concrete by adopting water spraying or curing agent, and determining the curing time according to the temperature, wherein the curing time is generally not less than 7 days and nights.
5) Foundation pit backfill
The foundation pit is backfilled by an excavator, and is manually matched with machinery for layered symmetrical backfilling and tamping and compacting by a road roller. In the backfilling process, in order to ensure that machines or machines collide the waterproof protective layer, manual tamping and filling are carried out by using small machines within the backfilling thickness of 500mm on the structural top plate and around the pipeline, and the overlapping between the tamping and the tamping is not less than 1/3 ramming bottom width.
(1) Backfilling with 3% cement stone chips to 500mm above the top plate of the electric power ditch, uniformly and symmetrically performing backfilling construction, and tamping in layers.
(2) The thickness of each layer is not more than 250mm by manual compaction, and is not more than 300mm by mechanical compaction, and the waterproof layer is prevented from being damaged.
The invention compresses the three project of the reinforcing steel bar, the template and the concrete into four construction processes from eight construction processes by one-time pouring in the construction process, reduces a technical intermittence time (the time for curing and removing the template of the bottom plate concrete in two pouring), is convenient for construction organization and management and saves the construction period. The processing and binding of the one-time pouring steel bars reduce the processing of the joints of the steel bars, reduce the workload and save the steel. The template is processed into the big board according to monoblock wall body size, and the installation and the demolition are convenient for, have improved the turnover utilization ratio. The horizontal construction joint treatment is reduced in the template installation, the engineering quantity is reduced, the water stop belt and labor cost are saved, and the construction efficiency is improved. From the engineering quality, the one-time wall body pouring adopts the large template without leaving construction joints, improves the impression quality of the concrete structure of the electric power ditch, has the anti-permeability and water seepage capability, and strengthens the integrity of the structure. Therefore, the one-time pouring scheme improves the engineering quality, saves the investment, shortens the construction period and is worthy of popularization.
The concrete construction process comprises the following steps: firstly, a cushion layer and a waterproof and protective layer → reinforcement → template installation → concrete pouring → maintenance and template removal.
The invention is simplified into one step by binding the reinforcing steel bars twice, erecting the formwork twice and pouring the concrete twice. The used materials are mainly: wood pattern or large bamboo plywood, 50X 80mm square wood strips,
Stagnant water split bolt, novel telescopic die carrier, marble cushion, ABS pipe (mainly used steel pipe support when making the support at the bottom plate within range, the cover is in the support bottom, is convenient for demolish) concrete, plastic film (maintenance use), electronic bayonet vibrator of flexible axle etc..
The above applications are only some embodiments of the present application. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept herein, and it is intended to cover all such modifications and variations as fall within the scope of the invention.
Claims (8)
1. The ethylene propylene diene monomer rubber water stop strip is characterized by at least comprising 100 parts of ethylene propylene diene monomer rubber, 32-35 parts of carbon black, 20-25 parts of paraffin and 2-4 parts of sulfur; 15-30 parts of light calcium carbonate, 0.5-1.2 parts of an accelerator and 1-2 parts of stearic acid by weight.
2. The ethylene propylene diene monomer rubber water stop strip as claimed in claim 1, wherein a bonding layer is arranged on the surface of the ethylene propylene diene monomer rubber water stop strip.
3. The construction method for pouring the electric power ditch by using the ethylene propylene diene monomer rubber water stop strip and the telescopic template bracket as claimed in claim 2, wherein the ethylene propylene diene monomer rubber water stop strip is used for deformation joint construction, and comprises a middle-buried rubber water stop band and an external-attached rubber water stop band.
4. The construction method for pouring the electric power ditch by using the ethylene propylene diene monomer rubber water stop strip and the retractable formwork support at one time according to claim 3, is characterized by comprising the following steps:
1) binding of reinforcing steel bars
The method comprises the following steps of (1) adopting one-time binding of reinforcing steel bars, popping up side (middle) wall lines on a cushion layer before binding, determining the positions of two rows of upright rods according to the dimension width of an outer package of the reinforcing steel bars of the power channel, and erecting a double-row multi-upright-rod type steel pipe fastener type scaffold to form temporary support of main reinforcing steel bars and a worker operation platform during binding of the reinforcing steel bars; then drawing position lines of main ribs and erection ribs on the cushion layer and the fixed scaffold steel pipes, and performing splayed buckle binding, welding or mechanical connection after the main ribs, the erection ribs and the stirrups are placed according to the position lines; after finishing, adding a protective layer and dismantling the scaffold; welding points or oblique fixed steel bars are additionally arranged at the four rib angle positions of the electric power ditch steel bar framework according to proper distances before the scaffold is dismantled;
2) formwork construction
The template construction process adopts a mode of one-time processing and template installation; wherein, the inner and outer moulds are both made of wood templates, self-adhesive double-sided sponge strips are adhered to the template seams, the inner surface of the template is smooth and flat, and a release agent is coated before use;
the template construction structure is as follows: the top part comprises a top plate template and a top plate, the side surface comprises a side wall template, a side wall and a side wall template support which are sequentially arranged from inside to outside, the side wall template support is triangular, the sectional area is sequentially increased from top to bottom, and the bottom part comprises a bottom plate;
the interior of the template is supported by a template support, the support is a telescopic template support and comprises a template support middle cross brace, a template support top cross brace and a template support vertical brace, the template support vertical brace is arranged in a vertical and oblique mode and forms a triangular stable structure with the template support top cross brace and the template support middle cross brace; the support is preassembled, wherein the top ends of two adjacent template support vertical supports are hinged by the support, and two sides of the support are provided with template support top transverse supports;
3) deformation joint construction
The deformation joint construction comprises a preset middle-buried ethylene propylene diene monomer rubber waterstop and an externally-attached ethylene propylene diene monomer rubber waterstop;
the middle embedded ethylene propylene diene monomer water stop belt and the outer attached ethylene propylene diene monomer water stop belt are arranged in a surrounding mode along the bottom plate, the side wall and the top plate; the embedded ethylene propylene diene monomer water stop is constructed sequentially according to the sequence of the bottom plate, the side wall and the top plate, and the externally-attached ethylene propylene diene monomer water stop comprises the installation of the bottom plate water stop and the installation of the side wall water stop;
4) concrete pouring and vibrating
The concrete pouring and vibrating are one-time pouring concrete, the concrete pouring is from bottom to top, the bottom plate is poured firstly, then the side walls are poured, and then the top plate is poured; pouring and vibrating the bottom plate from a low position to a high position in a layered manner according to the width of the electric power ditch, and performing covering maintenance after concrete pouring, vibrating and surface collection are finished; and removing the template and the bracket after the template removal strength is reached.
5. The construction method for one-time pouring of the electric power ditch by utilizing the ethylene propylene diene monomer rubber water stop strip and the retractable formwork support as claimed in claim 4, wherein in the step 4), after the formwork and the support are removed, the steel pipe support holes on the floor are filled with waterproof concrete with the same strength; and curing the concrete within 12 hours after the concrete is poured, wherein the plane concrete is cured by a method of covering a plastic film or spraying water on a geotextile, and the vertical concrete is cured by spraying water or a curing agent.
6. The construction method for one-time pouring of the electric power ditch by using the ethylene propylene diene monomer rubber water stop strip and the retractable formwork support as claimed in claim 5, characterized by further comprising the step 5) of backfilling the foundation pit, wherein the backfilling of the foundation pit is realized by using an excavator, and is manually matched with mechanical layered symmetrical backfilling tamping and road roller compacting; when backfilling, small machines are used for tamping in the backfilling thickness of 500mm on the structural top plate and around the pipeline, and the overlapping between the tamps is not less than 1/3 rammed bottom width.
7. The construction method for one-time pouring of the electric power ditch by using the ethylene propylene diene monomer rubber water stop strip and the retractable formwork support as claimed in claim 6, is characterized in that 3% of cement stone chips are backfilled to 500mm above a top plate of the electric power ditch, the backfilling construction is uniformly and symmetrically carried out, and the backfilling is carried out in layers.
8. The construction method for one-time pouring of the electric power ditch by using the ethylene propylene diene monomer rubber water stop strip and the retractable formwork support as claimed in claim 7, wherein the thickness of each layer is manually tamped and is not more than 250mm, and the thickness of each layer is mechanically tamped and is not more than 300 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111284293.7A CN113980398A (en) | 2021-11-01 | 2021-11-01 | Ethylene propylene diene monomer rubber and method for casting electric power channel in one step by adopting ethylene propylene diene monomer rubber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111284293.7A CN113980398A (en) | 2021-11-01 | 2021-11-01 | Ethylene propylene diene monomer rubber and method for casting electric power channel in one step by adopting ethylene propylene diene monomer rubber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116376177A (en) * | 2023-03-31 | 2023-07-04 | 马鞍山宏力橡胶制品有限公司 | Microwave heating continuous vulcanization extrusion type rubber water stop and preparation method thereof |
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| GB1433176A (en) * | 1973-04-19 | 1976-04-22 | Metrailer C E | Apparatus for casting a concrete structure |
| CN102877486A (en) * | 2012-10-22 | 2013-01-16 | 济南城建集团有限公司 | Integral cast-in-situ construction method for cable ducts |
| CN107573600A (en) * | 2017-09-06 | 2018-01-12 | 北京化工大学 | A kind of railway tunnel special (purpose) rubber water stop rubber and its preparation technology |
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| CN116376177A (en) * | 2023-03-31 | 2023-07-04 | 马鞍山宏力橡胶制品有限公司 | Microwave heating continuous vulcanization extrusion type rubber water stop and preparation method thereof |
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