CN112942444A - Self-cracking-resistant rigid landfill reinforced concrete bottom plate and construction process thereof - Google Patents
Self-cracking-resistant rigid landfill reinforced concrete bottom plate and construction process thereof Download PDFInfo
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 67
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- 238000005336 cracking Methods 0.000 title claims abstract description 24
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- 230000008569 process Effects 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
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- 238000005452 bending Methods 0.000 claims abstract description 12
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- 230000002787 reinforcement Effects 0.000 claims description 38
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- 238000007789 sealing Methods 0.000 claims description 11
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
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- 229920006262 high density polyethylene film Polymers 0.000 description 1
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- 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
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Abstract
The invention discloses a self-cracking-resistant rigid landfill reinforced concrete bottom plate, which comprises a horizontal frame and a bottom plate, wherein the horizontal frame is fixedly connected to a post constructed in advance, the bottom plate and the horizontal frame are integrally cast in situ, and unbonded prestressed steel bars are arranged along a tension area in each middle 1/3 span of the bottom plate; the horizontal frame is composed of beams, the horizontal frame divides the landfill unit into four equal parts to reduce the span of the bottom plate, and the frame beams are internally provided with bonding prestressed steel bars to reduce the bending deformation of the horizontal frame. Also discloses a construction process of the bottom plate. The invention can reduce the tensile stress of the rigid dangerous waste landfill reinforced concrete bottom plate under the load effect caused by dangerous waste, ensure that the reinforced concrete bottom plate does not crack or the crack is controlled within the design range, achieve the effect of self-cracking resistance, simultaneously ensure that the flexible impermeable liner in the landfill site can not be torn due to deformation and displacement to cause the leakage of dangerous waste, and improve the safety coefficient of the landfill site.
Description
Technical Field
The invention belongs to the technical field of hazardous waste landfill, and particularly relates to a self-cracking-resistant rigid landfill reinforced concrete bottom plate and a construction process thereof.
Background
The hazardous waste rigid landfill is a landfill site which is built by reinforced concrete and used for landfill of fly ash, solid hazardous waste and the like after waste incineration power generation, leakage of percolate is prevented by utilizing the seepage-proofing capacity of the reinforced concrete, and a flexible HDPE seepage-proofing film can be arranged to increase the seepage-proofing capacity.
The management of industrial hazardous wastes is an important component of the environmental protection work in China, and has important significance for preventing environmental risks, guaranteeing human health, maintaining ecological integrity and improving the atmosphere, water and soil environment, and the safety function of the hazardous waste landfill is to prevent harmful substances such as heavy metals in the hazardous wastes from migrating to the environment and human bodies. Waste salt generated in fine chemical industry, biological pharmacy, pharmaceutical chemical industry and other industries is difficult to meet the entrance standard of a flexible landfill even if being pretreated, the treatment of dangerous waste by using a rigid landfill is a safe and reliable method, the construction of units of the rigid landfill requires that the leakage condition of each landfill unit can be observed under visual conditions, and therefore, an overhead reinforced concrete bottom plate is generally adopted.
At present, a non-prestressed reinforced concrete structure is adopted in the construction of a domestic rigid landfill, so that the crack of a bottom plate is easy to be overlarge, the self-waterproof actual effect of a concrete structure is caused, and the overlarge downward deflection deformation of the bottom plate can also tear an anti-seepage lining in the landfill, so that the leakage of hazardous waste leachate is finally caused. The seepage-proofing lining is a flexible seepage-proofing lining which is arranged in the rigid landfill and is constructed by HDPE films, so that the seepage-proofing capacity and the safety of the landfill can be improved.
The reduction of the deformation value of the reinforced concrete bottom plate of the rigid landfill site is the key for preventing the bottom plate from cracking and ensuring the self-waterproof capability of the concrete of the bottom plate. The deformation and the crack of the reinforced concrete bottom plate are mainly caused by the bending effect caused by the upper load, the reinforced concrete beam is adopted to divide the plate blocks, and the tensile stress in the plate can be effectively reduced through the anti-deformation capability of the beam; the reinforced concrete beam is a prestressed reinforced concrete beam which is changed from a common concrete beam, and the downward bending deformation of the beam can be further reduced, so that the overall downward deformation value of the plate is reduced. The prestressed reinforced concrete floor slab has mature application in buildings, particularly large-span buildings, so that the technology can be applied to the design of the bottom plate of a rigid landfill site, and the tensile stress of the reinforced concrete bottom plate can be reduced under the load action caused by hazardous wastes through effective design and construction measures, even the tensile stress does not occur, so that the reinforced concrete bottom plate is ensured not to crack or the crack is controlled within the design range, and the self-cracking effect is achieved. The self-cracking-resistant rigid landfill reinforced concrete bottom plate can ensure that the flexible anti-seepage gasket in the landfill cannot be torn due to deformation and displacement to cause leakage, and the safety coefficient of the landfill is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the self-cracking-resistant rigid landfill reinforced concrete bottom plate and the construction process thereof, so that the tensile stress of the reinforced concrete bottom plate can be reduced under the load action caused by hazardous wastes, even the tensile stress does not occur, and the reinforced concrete bottom plate is ensured not to crack or the crack is controlled within the design range. The invention can lead the rigid landfill bottom plate to achieve the self-anti-cracking effect, and simultaneously can ensure that the flexible anti-seepage gasket in the landfill cannot be torn due to deformation and displacement to cause the leakage of hazardous wastes, thereby improving the safety factor of the landfill.
In order to solve the technical problem, the invention is solved by the following technical scheme: a self-cracking-resistant rigid landfill reinforced concrete bottom plate is characterized in that a horizontal frame is arranged at the lower part of the bottom plate, the horizontal frame is fixedly connected to a post constructed in advance, the bottom plate and the horizontal frame are integrally cast in situ, and unbonded prestressed steel bars are arranged along a tension area in each middle 1/3 spanning area of the bottom plate; the horizontal frame is composed of beams, and the horizontal frame divides the landfill unit into four equal parts so as to reduce the span of the bottom plate; and the frame beam is internally provided with bonding prestressed steel bars, so that the bending deformation of the horizontal frame is reduced. And the frame beam is internally provided with bonding prestressed steel bars, so that the bending deformation of the horizontal frame is reduced.
The bottom plate is provided with a flanging, and a water stop steel plate is arranged in the flanging and is used for later-stage cast-in-place wall connection water prevention; and the water stop steel plates are connected by welding to ensure that the water cannot leak. The turn-ups height is 600 mm.
And non-prestressed reinforcements are arranged in the beam and the bottom plate and are configured according to load calculation. And the beam is internally provided with bonding prestressed steel bars.
The determination formula of the sectional area of the prestressed reinforcement is as follows:
the calculation formula of the number of the steel strands required in each meter width range in the tension area is as follows:
wherein A isplThe sectional area of a single steel strand.
The invention also discloses a construction process of the self-anti-cracking rigid landfill reinforced concrete bottom plate, which is carried out on the basis of finishing foundation engineering construction and bottom pillar construction, and the process comprises the following steps:
firstly, constructing a bonded prestressed reinforced concrete beam, erecting a beam bottom template, and then binding prestressed beam reinforcing steel bars;
determining the position of a prestressed duct, installing a duct support reinforcing steel bar, then installing a corrugated pipe, penetrating the prestressed reinforcing steel bar, arranging a drainage pipe on the corrugated pipe, and finally installing a spiral reinforcing rib and an anchor backing plate at an anchoring end;
step three, sealing the template after the steel bars are concealed and accepted, pouring concrete and maintaining;
step four, after the preset strength is reached, installing a tension end working anchor plate, a working clamping piece and a limiting plate, then installing a jack, a tool anchor plate and a tool clamping piece, and then applying prestress to sigmaconAfter holding the load for 1 minute, the strain is again overstretched by 0.03 sigmaconMake up for the loss of prestress;
fifthly, dismantling the tensioning equipment and cutting off redundant prestressed steel strands;
grouting the corrugated pipe pore passages until grout is discharged from the drainage pipe, blocking the drainage holes, continuing grouting until grout is discharged from the other end of the beam, and stopping grouting after the pore passages are blocked;
seventhly, performing anchor sealing protection on anchors at two ends of the beam by using concrete;
drawing a bottom plate prestressed tendon plane arrangement diagram, and determining the laying sequence and position of prestressed tendons;
step nine, building a bottom plate support and a template, installing non-prestressed reinforcements at the bottom of the plate, installing a prestressed reinforcement positioning support in a longitudinal and transverse bidirectional 1/3 plate span, laying short-span direction unbonded prestressed reinforcements, and then laying long-span direction unbonded prestressed reinforcements;
installing spiral reinforcing ribs and anchor backing plates at the end parts, and installing non-prestressed steel bars at the top of the bottom plate;
step eleven, installing side wall steel bars, water stop steel plates and side wall templates according to the position of a horizontal construction joint designed by construction;
step twelve, after the steel bars are concealed and accepted, pouring concrete and maintaining the concrete to the specified strength;
step thirteen, installing a working anchor plate and a working clamping piece, connecting a jack, tensioning the unbonded prestressed reinforcement until the stress reaches sigmaconAnd (4) removing the tensioning equipment, cutting off redundant steel strands, and finally sealing the anchor.
The invention provides a self-anti-cracking rigid landfill reinforced concrete bottom plate and a construction process thereof, which can reduce the tensile stress of the reinforced concrete bottom plate under the load action caused by hazardous wastes through effective design and construction measures, even avoid the tensile stress, and ensure that the reinforced concrete bottom plate does not crack or the crack is controlled within the design range; the self-cracking-prevention rigid landfill bottom plate solves the problem that a common concrete bottom plate is easy to crack to cause leakage of dangerous waste, can achieve the self-cracking-prevention effect of the rigid landfill bottom plate through the application of the technology, and can ensure that a flexible anti-seepage gasket in a landfill cannot be torn due to deformation and displacement to cause leakage of the dangerous waste, so that the safety coefficient of the landfill is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be discussed below, it is obvious that the technical solutions described in conjunction with the drawings are only some embodiments of the present invention, and for those skilled in the art, other embodiments and drawings can be obtained according to the embodiments shown in the drawings without creative efforts.
Fig. 1 is a plan view of a floor beam frame of the present invention.
Fig. 2 is a plan view of the base plate of the present invention.
Fig. 3 is a cross-sectional view of the base plate of the present invention.
In the figure: horizontal frame 1, bottom plate 2, post 3, roof beam 4, turn-ups 5, stagnant water steel sheet 6, filtration liquid collecting hole 7.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments described herein without the need for inventive work, are within the scope of the present invention.
As shown in fig. 1 to 3, the present invention relates to a self-cracking rigid landfill reinforced concrete floor and a construction process thereof, wherein a horizontal frame is formed by arranging a bonded prestressed reinforced concrete beam under the rigid landfill reinforced concrete floor, so as to improve the deformation resistance of the beam. The reinforced concrete beam is a cast-in-place reinforced concrete beam which adopts post-tensioned prestressing force and is used for supporting a reinforced concrete slab, and bonding prestressed reinforcements are arranged inside the beam. The reinforced concrete frame is a frame consisting of longitudinal and transverse prestressed reinforced concrete beams and is used for supporting a reinforced concrete bottom plate.
Tensile areas are divided in the longitudinal middle 1/3 area and the transverse middle 1/3 area of each reinforced concrete bottom plate, unbonded prestressed reinforcements are arranged in the tensile areas, the bending deformation of the bottom plates is further reduced, the tensile stress of the tensile areas of the reinforced concrete slabs is reduced, even the tensile stress in the reinforced concrete slabs can be eliminated, the purpose of preventing the reinforced concrete bottom plates from cracking due to the tensile stress is achieved, and therefore the self-cracking-prevention rigid landfill reinforced concrete bottom plate is formed. The reinforced concrete slab is a bottom plate for a rigid landfill, and the side edge of the reinforced concrete slab is integrally cast-in-place connected with the cast-in-place reinforced concrete side wall. The non-prestressed reinforcement is a reinforcement which is not prestressed and is arranged in the reinforced concrete beam and the reinforced concrete slab according to the structural design requirement.
And simultaneously pouring a reinforced concrete flanging at the periphery of the bottom plate, wherein the height of the flanging is 600mm, and a water stop steel plate is arranged in the middle of the flanging. The concrete flanging is a rigid landfill reinforced concrete side wall integrally cast with the bottom plate in a cast-in-place mode, and water seepage caused by the formation of construction joints at the toe parts of the wall is prevented. The water stop steel plate is a special steel plate for stopping water of a construction joint, which is arranged on a concrete side wall, and plates are connected by welding to form continuous water prevention, so that the leakage of the construction joint part can be avoided.
The reinforced concrete bottom plate is poured by waterproof concrete, and non-prestressed reinforcements are arranged on the structure according to the load and the internal force of the structure except for the use of the bonded prestressed reinforcements.
Installation of the bonded prestressed reinforcement: and mounting a pore channel along the tension area in advance, then arranging prestressed reinforcements in the pore channel, grouting after tensioning to fill the pore channel to form bonded prestressed reinforcements, and fixing two ends by using an anchorage device.
Installation of unbonded prestressed reinforcements: the prestressed reinforcement without pore channels is arranged along the tension area, the concrete can be directly tensioned after reaching the strength, and two ends of the prestressed reinforcement are fixed by an anchorage device to form prestress.
The invention relates to a reinforced concrete bottom plate construction process, which comprises the steps of firstly constructing a reinforced concrete column as required, and connecting a reserved steel bar on the column with a reinforced concrete beam steel bar of a bottom plate; and before pouring, a beam template is erected, beam non-prestressed reinforcements are installed, then a bonding prestressed reinforcement grouting pipeline is arranged according to the position, and prestressed steel strands penetrate through the pipeline.
After the beam steel bars are installed, a bottom plate template is erected, non-prestressed steel bars and non-adhesive prestressed steel bars in the midspan 1/3 area are installed on the installation plate, wall steel bars and water stop steel plates at the flanging parts are installed, and the joints of the water stop steel plates are connected in a welding mode. And installing the flanging template after the flanging steel bars are finished.
And after all the steel bars are installed, pouring impervious concrete and maintaining. And (5) removing the template after the concrete is cured to reach 100% strength.
Mounting an anchorage at one end of the beam, tensioning the steel bar by using a jack until the specified prestress value is reached, and fixing the anchorage at the other end to form the prestress in the beam; installing an extrusion anchorage at one end of a plate prestressed reinforcement, then tensioning the unbonded prestressed reinforcement by using a jack, stripping a protective sleeve outside the non-prestressed reinforcement at the fixed end after reaching a specified prestress value, cleaning grease, and then fixing by using a single-hole clip anchorage; and after the prestress application is finished, performing anchor sealing operation.
The self-cracking-prevention bottom plate is a unit cell of a rigid landfill site, a large reservoir area can be formed by a plurality of unit cells, classified landfill of wastes can be realized after the wastes are classified, the concrete bottom plate can be prevented from forming large downward bending deformation due to large load after landfill sealing, and the condition that leachate of a landfill unit leaks due to cracking of the bottom plate or breakage of a flexible artificial lining is avoided.
The working principle and the parameter calculation of the invention are as follows:
load on the floor: including the dead weight G of the boardZAnd load G caused by hazardous wastew。
The tension zone causes bending moment M by load on the plateKCalculating the bending moment value M according to standard combinationK。
Calculated according to a 1 meter wide panel unit:
the cross-sectional area A is bh, wherein b is 1m, and h is the plate thickness;
section flexural modulus: wb＝bh2/6；
The control stress of each strand of steel strand is as follows: sigmacon＝0.75fptk；
The prestress loss is: 0.3 sigmacon；
The effective prestress of each strand of steel strand is as follows: sigmape＝0.7σcon；
Then, the prestressed reinforcement sectional area is determined as follows:
the number of steel strands required in each meter width range in the tension area is as follows:
wherein A isplThe sectional area of a single steel strand.
The sectional area of the prestressed steel bar in the beam is also calculated according to the method, and the linear load in the stress range needs to be converted when the bending moment value is calculated.
Through the technical scheme, the combined stress mechanism of the prestressed reinforced concrete beam and the prestressed reinforced concrete plate is adopted at the bottom plate part of the rigid landfill site, so that the downward deformation value of the reinforced concrete bottom plate is reduced, the bending stress in the plate can be effectively reduced, the purpose of self-cracking prevention of concrete is achieved, the anti-seepage film in the landfill site can be prevented from being torn due to deformation of the bottom plate, the risk caused by seepage of dangerous waste percolate can be effectively prevented, the technical scheme has the advantages of strong reliability, simple and convenient equipment process, low site condition requirement, high safety coefficient, strong engineering practicability and the like, and is convenient for large-scale popularization and application.
The self-cracking-prevention rigid landfill reinforced concrete bottom plate needs to be constructed on the basis of finishing foundation engineering construction and bottom pillar construction. The construction process of the bottom plate mainly comprises the following steps.
Step one, constructing a bonded prestressed reinforced concrete beam, erecting a beam bottom template, and then binding prestressed beam reinforcing steel bars.
Determining the position of a prestressed duct, installing a duct support reinforcing steel bar, then installing a corrugated pipe, penetrating the prestressed reinforcing steel bar, arranging a water draining pipe on the corrugated pipe, and finally installing a spiral reinforcing rib and an anchor backing plate at the anchoring end.
And step three, sealing the template after the steel bars are concealed and accepted, pouring concrete and maintaining.
Step four, after the preset strength is reached, installing a tension end working anchor plate, a working clamping piece and a limiting plate, then installing a jack, a tool anchor plate and a tool clamping piece, and then applying prestress to sigmaconHold the lotusAfter 1 minute, the strain is again overstretched by 0.03 sigmaconMake up for the loss of prestress.
And fifthly, dismantling the tensioning equipment and cutting off redundant prestressed steel strands.
And step six, grouting the corrugated pipe pore channel until all the grout flows out of the water drainage pipe to block the water drainage hole, continuing grouting until the grout flows out of the other end of the beam, and stopping grouting after pore channel blocking.
And seventhly, performing anchor sealing protection on anchors at two ends of the beam by using concrete.
And step eight, drawing a prestressed tendon plane arrangement diagram, and determining the laying sequence and position of the prestressed tendons.
And step nine, building a bottom plate support and a template, installing non-prestressed reinforcements at the bottom of the plate, installing a prestressed reinforcement positioning support in the longitudinal and transverse bidirectional 1/3 plate span, laying the unbonded prestressed reinforcements in the short span direction, and then laying the unbonded prestressed reinforcements in the long span direction.
Step ten, installing spiral reinforcing ribs and anchor backing plates at the end parts, and installing non-prestressed reinforcements on the plate top.
Step eleven, installing side wall reinforcing steel bars, water stop steel plates and side wall templates according to the horizontal construction joint position of the construction design.
Step twelve, after the steel bars are concealed and accepted, pouring concrete and maintaining to the specified strength.
Step thirteen, installing a working anchor plate and a working clamping piece, connecting a jack, tensioning the unbonded prestressed reinforcement until the stress reaches sigmaconAnd (4) removing the tensioning equipment, cutting off redundant steel strands, and finally sealing the anchor.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a from crack control rigid landfill reinforced concrete bottom plate which characterized in that: the lower part of the bottom plate is provided with a horizontal frame which is fixedly connected to a post C constructed in advance, the bottom plate and the horizontal frame A are cast in situ integrally, and unbonded prestressed steel bars are arranged along a tension area in each middle 1/3 spanning area of the bottom plate; the horizontal frame is composed of beams, and the horizontal frame divides the landfill unit into four equal parts so as to reduce the span of the bottom plate; and the frame beam is internally provided with bonding prestressed steel bars, so that the bending deformation of the horizontal frame is reduced.
2. The self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 1, wherein: the bottom plate is provided with a flanging, and a water stop steel plate is arranged in the flanging and is used for later-stage cast-in-place wall connection water prevention; and the water stop steel plates are connected by welding to ensure that the water cannot leak.
3. The self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 2, wherein: the turn-ups height is 600 mm.
4. The self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 2, wherein: and non-prestressed reinforcements are arranged in the beam and the bottom plate and are configured according to load calculation.
5. The self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 4, wherein: and the beam is internally provided with bonding prestressed steel bars.
6. The self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 5, wherein: the determination formula of the sectional area of the prestressed reinforcement is as follows:
7. the self anti-cracking rigid landfill reinforced concrete floor as claimed in claim 6, wherein: the calculation formula of the number of the steel strands required in each meter width range in the tension area is as follows:
wherein A isplThe sectional area of a single steel strand.
8. The construction process of the self-cracking rigid landfill reinforced concrete bottom plate is characterized in that construction is carried out on the basis of finishing foundation engineering construction and bottom pillar construction, and the process comprises the following steps:
firstly, constructing a bonded prestressed reinforced concrete beam, erecting a beam bottom template, and then binding prestressed beam reinforcing steel bars;
determining the position of a prestressed duct, installing a duct support reinforcing steel bar, then installing a corrugated pipe, penetrating the prestressed reinforcing steel bar, arranging a drainage pipe on the corrugated pipe, and finally installing a spiral reinforcing rib and an anchor backing plate at an anchoring end;
step three, sealing the template after the steel bars are concealed and accepted, pouring concrete and maintaining;
step four, after the preset strength is reached, installing a tension end working anchor plate, a working clamping piece and a limiting plate, then installing a jack, a tool anchor plate and a tool clamping piece, and then applying prestress to sigmaconAfter holding the load for 1 minute, the strain is again overstretched by 0.03 sigmaconCompensating for prestressingLoss;
fifthly, dismantling the tensioning equipment and cutting off redundant prestressed steel strands;
grouting the corrugated pipe pore passages until grout is discharged from the drainage pipe, blocking the drainage holes, continuing grouting until grout is discharged from the other end of the beam, and stopping grouting after the pore passages are blocked;
seventhly, performing anchor sealing protection on anchors at two ends of the beam by using concrete;
drawing a bottom plate prestressed tendon plane arrangement diagram, and determining the laying sequence and position of prestressed tendons;
step nine, building a bottom plate support and a template, installing non-prestressed reinforcements at the bottom of the plate, installing a prestressed reinforcement positioning support in a longitudinal and transverse bidirectional 1/3 plate span, laying short-span direction unbonded prestressed reinforcements, and then laying long-span direction unbonded prestressed reinforcements;
installing spiral reinforcing ribs and anchor backing plates at the end parts, and installing non-prestressed steel bars at the top of the bottom plate;
step eleven, installing side wall steel bars, water stop steel plates and side wall templates according to the position of a horizontal construction joint designed by construction;
step twelve, after the steel bars are concealed and accepted, pouring concrete and maintaining the concrete to the specified strength;
step thirteen, installing a working anchor plate and a working clamping piece, connecting a jack, tensioning the unbonded prestressed reinforcement until the stress reaches sigmaconAnd (4) removing the tensioning equipment, cutting off redundant steel strands, and finally sealing the anchor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110143879.5A CN112942444A (en) | 2021-02-02 | 2021-02-02 | Self-cracking-resistant rigid landfill reinforced concrete bottom plate and construction process thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132456A (en) * | 2013-03-19 | 2013-06-05 | 成军 | Construction method for large span girder with cementation pre-stress |
| CN109403516A (en) * | 2018-01-29 | 2019-03-01 | 中铁四局集团建筑工程有限公司 | Basement exterior wall construction method |
| CN110607841A (en) * | 2019-10-18 | 2019-12-24 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
| CN111515214A (en) * | 2020-04-17 | 2020-08-11 | 中国电建集团华东勘测设计研究院有限公司 | Step type hazardous waste rigid landfill system based on valley terrain and operation method |
| CN111561041A (en) * | 2020-05-21 | 2020-08-21 | 浙江世润建创科技发展有限公司 | Cast-in-place concrete pool bottom plate and construction method thereof |
| CN112170440A (en) * | 2020-09-09 | 2021-01-05 | 中国电建集团贵阳勘测设计研究院有限公司 | Rigid landfill leachate gravity flow drainage and air guide structure |
-
2021
- 2021-02-02 CN CN202110143879.5A patent/CN112942444A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103132456A (en) * | 2013-03-19 | 2013-06-05 | 成军 | Construction method for large span girder with cementation pre-stress |
| CN109403516A (en) * | 2018-01-29 | 2019-03-01 | 中铁四局集团建筑工程有限公司 | Basement exterior wall construction method |
| CN110607841A (en) * | 2019-10-18 | 2019-12-24 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
| CN111515214A (en) * | 2020-04-17 | 2020-08-11 | 中国电建集团华东勘测设计研究院有限公司 | Step type hazardous waste rigid landfill system based on valley terrain and operation method |
| CN111561041A (en) * | 2020-05-21 | 2020-08-21 | 浙江世润建创科技发展有限公司 | Cast-in-place concrete pool bottom plate and construction method thereof |
| CN112170440A (en) * | 2020-09-09 | 2021-01-05 | 中国电建集团贵阳勘测设计研究院有限公司 | Rigid landfill leachate gravity flow drainage and air guide structure |
Non-Patent Citations (2)
| Title |
|---|
| 车惠民 等: "《部分预应力混凝土——理论·设计·工程实践》", 28 February 1992, 西南交通大学出版社 * |
| 陈翔: "《混凝土结构工程施工（下）》", 31 January 2016, 北京理工大学出版社 * |
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