CN111676987A - Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method - Google Patents

Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method Download PDF

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Publication number
CN111676987A
CN111676987A CN202010490788.4A CN202010490788A CN111676987A CN 111676987 A CN111676987 A CN 111676987A CN 202010490788 A CN202010490788 A CN 202010490788A CN 111676987 A CN111676987 A CN 111676987A
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China
Prior art keywords
construction
slurry
vibrating
backfilling
soil
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CN202010490788.4A
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Chinese (zh)
Inventor
何世鸣
王树军
周与诚
李江
张宝河
郁和坤
陈辉
司呈庆
贾城
黄鑫峰
梁成华
王海宁
洪伟
岳忠杰
郭跃龙
陈鹏
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Beijing Hengyuan Xingye Geotechnical Engineering Technology Development Center
BEIJING URBAN CONSTRUCTION SCIENCE TECHNOLOGY PROMOTING ASSOCIATION
Beijing Building Material Geotechnical Engineering Corp
Original Assignee
Beijing Hengyuan Xingye Geotechnical Engineering Technology Development Center
BEIJING URBAN CONSTRUCTION SCIENCE TECHNOLOGY PROMOTING ASSOCIATION
Beijing Building Material Geotechnical Engineering Corp
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Application filed by Beijing Hengyuan Xingye Geotechnical Engineering Technology Development Center, BEIJING URBAN CONSTRUCTION SCIENCE TECHNOLOGY PROMOTING ASSOCIATION, Beijing Building Material Geotechnical Engineering Corp filed Critical Beijing Hengyuan Xingye Geotechnical Engineering Technology Development Center
Priority to CN202010490788.4A priority Critical patent/CN111676987A/en
Publication of CN111676987A publication Critical patent/CN111676987A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/06Foundation trenches ditches or narrow shafts
    • E02D17/12Back-filling of foundation trenches or ditches
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C04B28/344Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00146Sprayable or pumpable mixtures
    • C04B2111/00155Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732Uses not provided for elsewhere in C04B2111/00 for soil stabilisation

Abstract

The invention relates to a construction method for backfilling a construction fertilizer tank by using a vibrating, grouting and tamping method, which can be used for backfilling the fertilizer tank of a foundation pit of a building and also can be used for backfilling an underground pipe gallery or a cavity, and comprises the following steps: and filling backfill soil into the fertilizer tank in a grading manner, after each time of backfill soil is finished, spraying the stirred slurry into the backfill soil filled virtually, vibrating to form flowing plastic cement soil slurry, and solidifying the cement soil slurry to form a cement soil solidification body after a certain time. The method has the advantages of high construction speed, short period, low cost, easy guarantee of filling quality, realization of dismantling and recycling of the steel beam on the premise of ensuring safety, and obvious economic and environmental benefits.

Description

Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method
Technical Field
The invention relates to the technical field of backfill, in particular to a construction method for backfilling a construction fertilizer tank by a vibrating, grouting and tamping method. It can also be used for backfilling construction fertilizer slots, bridge abutment backs, pipe galleries, cavity backfilling and the like.
Background
The fertilizer groove means a part which is excavated for providing a working surface, and generally refers to a space between an outer wall of a basement or a foundation of a building and the edge of a foundation pit.
At present, the fertilizer trough backfilling generally adopts the following three methods: 1. adopting plain soil or 2: 8, lime soil or 3: 7, the design width of the fertilizer tank is generally less than 1m, the width is small, backfill soil can not be tamped layer by layer, so that the backfill quality can not be ensured, for example, the fertilizer tank of a certain Beijing building is backfilled, the backfilling time of the fertilizer tank part can be less than two years after the backfilling by adopting the method, and due to the soaking in rainy season and water seepage, the soil filled in the fertilizer tank part is settled and fallen, so that various pipelines buried in the part are broken, and serious consequences such as water cut, power cut and air stop of the building are caused.
2. The graded sandstone is selected as backfill material, and the backfill is dense by matching with a water ramming method, so that the buoyancy of water to the building cannot be ignored, and the cracking and the lifting of a building bottom plate can be possibly caused. Moreover, the backfilling of the fertilizer groove is not compact, the anchor rod is removed blindly, so that the foundation pit collapses, the adjacent pipeline such as a tap water pipe or a gas pipeline is broken, and the result is 'water-overflowing Jinshan' or 'dense smoke rolling, and luxurious rush sky'; there are also cases of damage such as severe cracking and tilting of adjacent buildings.
3. The self-compacting cement soil slurry for backfilling of a fertilizer tank of the referential application No. 201610562214.7 comprises 100-400kg of cement, 500-900kg of in-situ soil, 200-400kg of stone chips or stone powder, 50-100kg of fly ash, 1-3% of an accelerator or an early strength agent and a proper amount of water, and the materials are directly poured into the fertilizer tank. The slurry needs to be specially stirred and formed in a mixing station or a mixer, and then is transported to a site for pouring through a tank truck. The method can be one third or even one half cheaper than the method for pouring the concrete mortar, but the work efficiency is the same as that of the method for pouring the concrete mortar, and the problems of low construction efficiency and long construction period exist.
Therefore, a more efficient and economical method of fertilizer tank backfilling is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method for backfilling a construction fertilizer tank by using a vibrating, grouting and tamping method, which has the advantages of good backfilling quality, short construction period and low cost.
The above object of the present invention is achieved by the following technical solutions:
the construction method for backfilling the construction fertilizer groove of the building by the vibration-impact slurry ramming method comprises the following steps: and filling backfill soil into the fertilizer tank in a grading manner, after each time of backfill soil is finished, spraying the stirred slurry into the backfill soil filled virtually, vibrating to form flowing plastic cement soil slurry, and solidifying the cement soil slurry to form a cement soil solidification body after a certain time.
By adopting the technical scheme, the backfill soil is directly backfilled into the fertilizer tank, then the cement soil slurry is formed by spraying and vibrating the backfill soil, and a cement soil solidification body is formed after the cement soil slurry is solidified, so that the requirements of the fertilizer tank on the performance of filling strength, seepage resistance, collapse prevention and the like are met.
Compared with the traditional backfill, the backfill has the advantages that the filling strength is easy to control, the quality is good, and risks such as later-stage collapse and the like can be avoided;
compared with graded sandstone serving as backfill, the filling material has high filling strength, good seepage resistance and sink-proof performance, and avoids water ramming, so that the building can not be damaged;
compared with cement mortar filling, the cement mortar is not stirred by a stirring station or a stirrer, and only a small stirring barrel is used for stirring and spraying the slurry; and meanwhile, the transportation of cement soil mortar is omitted. When the scheme is backfilled, only the muck truck pours soil into the fertilizer tank, the speed of inserting and tamping with slurry can be completely kept up with, so to speak, how fast the soil is filled, and how fast the whole foundation tank is backfilled, so the scheme has the advantages of high construction efficiency, short period and low cost.
The present invention in a preferred example may be further configured to: the slurry is a single-liquid chemical slurry, which is prepared from the following raw materials: 20-30 parts of disodium hydrogen phosphate, 490-510 parts of water by volume, 380-420 parts of cement and 180-220 parts of water glass by volume.
By adopting the technical scheme, the chemical slurry is a single liquid which can adjust the setting time so as to be set in a desired time, the normal viscosity of the chemical slurry is similar to that of water, but the chemical slurry can be instantly set into a solid in time when the certain time is up, such as one hour or two hours. This scheme is convenient for control time, and at the filling in-process, the thick liquid forms mobile cement soil through vibrating with soil, when waiting to design the setting time point, cement soil coagulates for the solid in the twinkling of an eye, forms work platform, and the staff of being convenient for demolishs the recovery to the waist rail in the fat groove. Compared with the conventional filling of cement soil slurry, the method needs to wait for the slurry to solidify for a long time, and the scheme has the advantages of being capable of quickly providing a working platform and shortening the construction period. In addition, because its filling strength is high, the security is good, can avoid when demolising the waist rail, the bank protection takes place to collapse.
The present invention in a preferred example may be further configured to: the preparation method of the single-liquid chemical slurry comprises the following steps: dissolving 20-30kg of disodium hydrogen phosphate in 30-40L of water, adding 460-470L of water, stirring uniformly, adding 380-420kg of cement, stirring uniformly, adding 180-220L of water glass, and stirring uniformly.
By adopting the technical scheme, the disodium hydrogen phosphate is dissolved firstly, then diluted and mixed with cement to form cement slurry, and finally the water glass is added, so that the slurry is in a liquid state within a certain time, the slurry spraying operation and the mixing with backfill soil are facilitated, and the slurry is quickly coagulated into a solid when the designed solidification time is reached.
The present invention in a preferred example may be further configured to: the grout is cement-water glass double grout, and the volume ratio of the cement grout to the water glass is (20-10): 1.
through adopting above-mentioned technical scheme, adopt the two thick liquids of cement water glass, can control the setting time of thick liquid, the flow distance of control cement soil thick liquid prevents its inflow in unexpected place, for example flow to outside the fat groove scope or along sandy soil layer infiltration etc..
The present invention in a preferred example may be further configured to: the cement slurry is vibrated by the vibroflot, when the vibroflot sprays single slurry, one slurry conveying pipe is arranged in the vibroflot, and when the vibroflot sprays double slurry, two slurry conveying pipes are arranged in the vibroflot.
The present invention in a preferred example may be further configured to: the specification power of the vibroflotation device is 13-30 kW, the revolution is 1450r.p.m, the rated current is 22.5-60A, the vibration force is 35-90 kN, the amplitude is 4.20mm, the outer diameter of the vibroflotation device is 274-351 mm, and the length of the vibroflotation device is 2000-2150 mm.
By adopting the technical scheme, the rotation number of 1450r.p.m is selected mainly by considering the natural vibration frequency of loose filling and filling such as sandy soil or soft lime soil and the like to be 1146, 1040 and 1800, so that the best encryption effect can be obtained, the reinforced concrete pile on the peripheral side slope or the reinforced concrete basement wall can not generate resonance, the influence is small, and the method is safe.
The present invention in a preferred example may be further configured to: vibrating the cement soil slurry by using a manual vibrating spear, and arranging a slurry conveying pipe on one side of the vibrating spear when spraying single slurry; when double slurry is sprayed, two slurry conveying pipes are respectively arranged on two sides of the vibrating rod.
By adopting the technical scheme, when the crane cannot approach the local part of the fertilizer tank and the vibrator cannot approach the local part of the fertilizer tank, the fertilizer tank can be vibrated by adopting the manual vibrating rod; it can also be used for small-scale backfill. The vibrating spear is easy to obtain, and the slurry conveying pipe is added, so that the operation is convenient, and the use is more flexible.
The present invention in a preferred example may be further configured to: the hoisting machinery of the vibroflotation device adopts an automobile crane, a crawler crane, a self-propelled derrick type special vehicle, a derrick mast or a pile driver.
The present invention in a preferred example may be further configured to: stirring of slurry, wherein the power of a slurry stirring machine is not less than 2.5KW, the slurry stirring barrel and a slurry storage barrel are subjected to 1.5-1.8m top planting, a filter screen or an electric vibrating screen is selected for a filter screen, the specification is 60 meshes, the power of a high-pressure pump is not less than 90KW, the rated pump pressure is not less than 24MPa, the rated pump amount is not less than 200L/min, the rated voltage of a starting cabinet is 380V, the rated current is not less than 90A, and a high-pressure rubber pipe can meet the pressure of 30 MPa.
By adopting the technical scheme, the optimal slurry mixing and conveying effects are achieved, and the overall work efficiency is high.
The present invention in a preferred example may be further configured to: the method is applied to underground pipe gallery backfilling, abutment backfilling of bridges and culverts or cavity backfilling.
By adopting the technical scheme, the technology can be adopted under the working condition that layered tamping is inconvenient, and the effects of good backfilling quality and high speed are achieved.
In summary, the invention has the following beneficial technical effects:
1. as the scheme only needs to have high enough soil filling speed, the speed of inserting and tamping with slurry can be completely kept up with that of the soil filling, so that the construction speed is high, the period is short, so to speak, how fast the construction can be realized, and the construction period is greatly saved;
2. the cost is low, and the mortar is more economical compared with concrete mortar;
3. the filling quality is easy to guarantee, and the functional requirements of the fertilizer tank filling such as strength, seepage resistance, shrinkage prevention, collapse prevention and the like are met. Various fillers in the fertilizer tank can be mixed uniformly easily, even construction waste which is unwilling to pull out can be filled, even frozen soil blocks frozen in winter do not need to worry, the frozen soil blocks can be melted by hot cement slurry and can be mixed uniformly, and finally, cement soil cured substances meeting the requirements are formed;
4. through the special chemical single slurry formula, the cement soil is quickly solidified within a certain time, the guniting operation is facilitated, the quick solidification can be realized, the steel beam can be quickly dismantled and recycled on the premise of ensuring safety, and the economic and environment-friendly benefits are obvious.
5. The technology solves the technical pain point that the speed is slow, the quality is poor and the detection cannot be carried out on the backfill of narrow spaces such as a fertilizer trough and a table back in the field of building, bridges, culverts and municipal administration pipe galleries, belongs to the domestic initiative, is a technical innovation in the field, has the advantages of high efficiency, economy and environmental protection, and has high economic benefit and social benefit.
Drawings
FIG. 1 is a flow chart of the fertilizer tank backfilling process in the scheme.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the construction method for backfilling a fertilizer groove of a building by using a vibrating, grouting and tamping method disclosed by the invention can be used for backfilling the fertilizer groove, backfilling an underground pipe gallery or a cavity and the like, and the backfilling construction method comprises the following steps:
and S1, preparing site survey, and advancing construction equipment.
S2, positioning a high-pressure pump, a water pump, stirring equipment and the like, installing and debugging various equipment, and building a dustproof shed when necessary.
S3, backfilling soil texture and selecting a soil unloading opening.
And S4, planning a stock ground, and electrically connecting the adjacent water.
S5, self-unloading the soil pulling vehicle or filling the fertilizer tank by the forklift, filling the fertilizer tank by turns, wherein the filling can be performed by 1 car of backfill soil or 2-3 cars of backfill soil each time, the backfill soil can be freely selected according to the field working condition and the use machinery, and the filling height is not more than 3m each time.
And S6, after each backfill soil filling, carrying out slurry ramming construction, namely spraying slurry into the loosely filled backfill soil and vibrating to form a flowing plastic cement soil slurry, wherein the vibrating follows a three-over-three-under inserting and tamping method until uniform cement soil slurry is formed, and the cement soil slurry is solidified to form a cement soil solidification body after a certain time. The control of the amount of the sprayed slurry is adjusted according to the soil quality of the backfill soil, so that the backfill soil can be completely plasticized into a liquid state to form flowable and uniform cement soil slurry.
Firstly, spraying clear water in a trial mode before formal guniting to ensure that a pipeline is wet and smooth; and spraying clear water after the guniting is finished, and cleaning the pipeline. In order to increase the construction efficiency, the construction can be carried out at multiple points simultaneously, namely, the backfilling and the guniting construction are carried out at multiple places simultaneously to form cross operation, the integral work efficiency of the machine is improved, and the construction period is greatly shortened.
The slurry used for guniting in step S6 can be selected from single cement slurries commonly used in the art, and the preferred water cement ratio is 0.8: 1-1: 1. Or selecting water glass double slurry, and firstly mixing water glass according to the volume ratio of 1:1, adding water to dilute for one time, and mixing the diluted water glass with cement paste according to the volume ratio of 1: and mixing the two slurry in a ratio of 20-1: 10 to form the cement water glass double slurry.
More preferably, the slurry used for guniting in step S6 may be a single-liquid chemical slurry, and is prepared from the following raw materials by weight: 20-30 parts of disodium hydrogen phosphate, 490-510 parts of water by volume, 380-420 parts of cement and 180-220 parts of water glass by volume. Preferably, the water glass is high-modulus water glass, the modulus is not less than 3, and the baume degree is 38-40 Be'. The water-cement ratio of the cement paste is 0.8-1: 1.
In the slurry, disodium hydrogen phosphate (industrial product) plays a role in retarding coagulation, and water glass plays a role in accelerating coagulation. The setting time of the cement-soil slurry can be controlled within 0.5-2.5h by adopting the slurry, and the setting time of the slurry can be adjusted mainly by adjusting the addition amount of water glass. The slurry has the same viscosity as clear water before solidification, but instantly coagulates to form a solid state which does not flow to the solidification time point. The strength of a cement-soil coagulation body formed by stirring the slurry and the backfill soil can reach 0.4-0.8 MPa; the permeability coefficient reaches 1.0 x 10-6cm/s, has good anti-seepage effect.
The preparation method of the single-liquid chemical slurry comprises the following steps: taking 1.0m for example, the preparation method comprises the steps of taking 30 liters of water to dissolve 25kg of disodium hydrogen phosphate; then 470 liters of water is added into the container, and the dissolved solution is added and stirred evenly; then adding 400kg of cement, and uniformly stirring; then 200 liters of water glass is added and stirred evenly. The set time of the finally prepared single-liquid chemical slurry was 2 hours.
The power of a slurry stirring machine selected by the slurry stirring equipment is not smaller than 2.5kW, and the slurry stirring barrel and the slurry storage barrel can adopt the 1.5-1.8m high speed planting specification or the engineering requirement; the filter screen is a filter screen or an electric vibrating screen, and the filter screen is below 60 meshes. The power of the high-pressure pump is not less than 90kW, the rated pump pressure is not less than 24MPa, and the rated pump capacity is not less than 200L/min. The rated voltage of the starting cabinet is 380V, and the rated current is not less than 90A. High-pressure rubber pipes: can meet the pressure of 30 MPa.
And step S6, vibrating the cement soil slurry by using the vibroflot, wherein a slurry conveying pipe is arranged in the vibroflot when the vibroflot sprays single slurry, and a slurry conveying pipe for conveying water glass is additionally arranged in the vibroflot when the vibroflot sprays double slurries.
The specification of the vibroflotation device is optimized to be a vibroflotation device with the power of 13-30 kW, the rotation number is 1450r.p.m, the rated current is 22.5-60A, the vibration force is 35-90 kN, the amplitude is 4.20mm, the outer diameter of the vibroflotation device is 274-351 mm, and the length of the vibroflotation device is 2000-2150 mm. The power is only required to meet the requirement of inserting and tamping cement soil, and the power is low, so that the high-power vibroflot can damage a waterproof structure of a building and the like if the vibroflot touches a building structure in the inserting and tamping process. The rotation number of 1450r.p.m is selected mainly by considering loose filling and filling such as sandy soil or soft lime soil, etc., and the natural vibration frequency is 1146, 1040 and 1800, so that the best encryption effect can be obtained, and the reinforced concrete pile on the peripheral side slope or the reinforced concrete basement wall can not generate resonance, and the influence is small, so that the method is safe. In order to improve the efficiency, and the field condition allows, the double-linkage or triple-linkage vibroflot can be adopted for working, so that the construction efficiency is higher. If a duplex or triplex vibroflot is adopted for working, one or two tee valves are added to ensure smooth construction; the two-way or three-way vibroflots are used together after two or three vibroflots are connected and fixed side by side.
In addition, the hoisting machinery of the vibroflot can be a truck crane, a crawler crane or a self-propelled derrick type special vehicle, and some sites can also adopt a derrick mast, a pile driver and the like. The construction is more convenient by adopting the truck crane, and the lifting force is not less than 80kN when the truck crane is adopted. If the dual or triple vibroflots are adopted for working, the lifting force of the crane is correspondingly increased. The hoisting height is greater than the construction depth. In order to prevent the lifting hook of the lifting equipment from swinging, colliding or scraping the outer skin of the existing building in the vibrating process of the vibrator, a rubber pad is adhered to the side, close to the building, of the lifting hook by strong glue, so that the outer wall can be protected from being damaged.
When the crane cannot approach the local part of the fertilizer tank and the vibroflot cannot approach the local part of the fertilizer tank, a manual vibrating rod can be adopted for vibrating, and when single slurry is sprayed, one side of the vibrating rod is bound with a slurry conveying pipe; when double grout is sprayed, two sides of the vibrating rod are respectively bound with a grout conveying pipe.
Example comparison:
a foundation pit in a Toyotai area in Beijing is 21.8m deep and about 800m in circumference, and the stratum: the upper part 6m is filled with soil and silt, and the lower part is a sandy gravel stratum. The water level is 1m below the foundation pit. The foundation pit supporting system is designed into a pile anchor system, the pile diameter is 800mm, the pile spacing is 1.5m, the anchor rods are one pile and one anchor, the spacing is 1.5m, 5 paths are arranged totally, and the length is 23-26 m. The waist rail is 28B I-steel two. The width of the fertilizer groove is reserved to be 0.8 m.
In the construction process, although a rotary drilling rig with good perpendicularity is adopted, the situation that the perpendicularity of the pile is not easy to guarantee is still inevitable. The phenomena of 'big belly' and concrete over-irrigation appear at a plurality of positions. After the steel beam is tensioned and locked in anchor rod construction, the width of most of the fertilizer grooves is found to be less than 0.4 m. And the length of the cut steel strand is 10-20 cm. If people stand in the narrow fertilizer groove to fill soil layer by layer, layer compaction is obviously not realized. The construction unit also proposes an idea of recycling steel beams, and if the fat tank is not densely backfilled, blind removal of the anchor rods obviously causes deformation and even collapse of the foundation pit support piles, and seriously causes damage to pipelines close to roads or building structures. Four solutions are proposed for this purpose, making a technical-economic comparison.
According to the first scheme, plain soil is backfilled, and layered backfilling and layered tamping cannot be implemented obviously, so that people cannot enter the narrow space and cannot realize layered tamping, and therefore the idea of dismantling and recycling steel beams cannot be realized. Even if the method is implemented reluctantly, the construction period is 22 days.
And the second scheme adopts graded sandstone backfill and a water ramming method, and the method is rarely adopted in Beijing areas, particularly large-area and large-depth foundation pits, has no precedent, needs a large amount of water, has no water in the stratum, can cause serious damage to the stability of the foundation pits, cannot accurately estimate the buoyancy damage of the building, and finally gives up.
And a third scheme is that self-compacting cement soil slurry is adopted for backfilling. The scheme can ensure safe backfilling, cannot damage the existing supporting system, can realize the idea of dismantling the anchor rod, saves the manufacturing cost by more than 40% compared with low-grade concrete or mortar, and can save the direct cost of 200 ten thousand yuan by computing according to theoretical amount and carrying out the cultivation in 14000 m. Transport less outside for 14000m, transport cost and consumption are saved by 35 ten thousand yuan. The steel beam is recycled to directly obtain 100 ten thousand yuan. The construction period is about 21 days.
And the scheme adopts a slurry compaction method, can ensure safe backfill, cannot damage the existing support system and buildings, can realize the idea of dismantling the anchor rod, saves the manufacturing cost by more than 60 percent compared with low-grade concrete or mortar, and can save 330 ten thousand yuan direct cost by carrying out labor cultivation at 14000m according to the calculation of theoretical square quantity. Transport less outside for 14000m, transport cost and consumption are saved by 35 ten thousand yuan. The steel beam is recycled to directly obtain 100 ten thousand yuan. The construction period is about 7 days. Therefore, the economic benefit, the social benefit and the environmental protection benefit are obvious. The key point is that the construction period requirement of construction units and general contractors can be well met.
The vibratory pulp-washing ramming backfill method has the advantages that the material cost is saved by using local materials, the earthwork outward transportation cost is reduced, industrial waste materials such as coal ash and fine particles (called as garbage in garbage and waste in waste) obtained by crushing construction garbage can be utilized, the cost advantage is obvious compared with concrete mortar, the cost advantage is also obvious compared with that cement soil slurry or solidified soil slurry stirred by a stirring station is transported to a site pouring mode by a tank car one tank by one tank, the steel beam dismantling and recycling can be realized on the premise of ensuring safety, and the economic benefit is obvious. The method ensures the quality, safety, rapidness, economy and environmental protection of the fertilizer tank backfilling, overcomes the adverse effect of the traditional backfilling method on the surrounding environment, and has obvious social benefit and environmental protection benefit.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. The construction method for backfilling the construction fertilizer groove of the building by using the vibration-impact slurry ramming method is characterized by comprising the following steps of: and filling backfill soil into the fertilizer tank in a grading manner, after each time of backfill soil is finished, spraying the stirred slurry into the backfill soil filled virtually, vibrating to form flowing plastic cement soil slurry, and solidifying the cement soil slurry to form a cement soil solidification body after a certain time.
2. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 1, which is characterized in that: the slurry is a single-liquid chemical slurry, which is prepared from the following raw materials: 20-30 parts of disodium hydrogen phosphate, 490-510 parts of water by volume, 380-420 parts of cement and 180-220 parts of water glass by volume.
3. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 2, which is characterized in that: the preparation method of the single-liquid chemical slurry comprises the following steps: dissolving 20-30kg of disodium hydrogen phosphate in 30-40L of water, adding 460-470L of water, stirring uniformly, adding 380-420kg of cement, stirring uniformly, adding 180-220L of water glass, and stirring uniformly.
4. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 1, which is characterized in that: the grout is cement-water glass double grout, and the volume ratio of the cement grout to the water glass is (20-10): 1.
5. the construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 1, which is characterized in that: and vibrating the cement soil slurry by using a vibrator.
6. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 5, which is characterized in that: the specification power of the vibroflotation device is 13-30 kW, the revolution is 1450r.p.m, the rated current is 22.5-60A, the vibration force is 35-90 kN, the amplitude is 4.20mm, the outer diameter of the vibroflotation device is 274-351 mm, and the length of the vibroflotation device is 2000-2150 mm.
7. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to claim 1, which is characterized in that: vibrating the cement soil slurry by using a manual vibrating spear, and arranging a slurry conveying pipe on one side of the vibrating spear when spraying single slurry; when double slurry is sprayed, two slurry conveying pipes are respectively arranged on two sides of the vibrating rod.
8. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to any one of claims 5 to 6, which is characterized in that: the hoisting machinery of the vibroflotation device adopts an automobile crane, a crawler crane, a self-propelled derrick type special vehicle, a derrick mast or a pile driver.
9. The construction method for backfilling a construction trough of a building by using the vibrating, grouting and tamping method according to any one of claims 1 to 7, which is characterized in that: stirring of slurry, wherein the power of a slurry stirring machine is not less than 2.5KW, the slurry stirring barrel and a slurry storage barrel are subjected to 1.5-1.8m top planting, a filter screen or an electric vibrating screen is selected for a filter screen, the specification is 60 meshes, the power of a high-pressure pump is not less than 90KW, the rated pump pressure is not less than 24MPa, the rated pump amount is not less than 200L/min, the rated voltage of a starting cabinet is 380V, the rated current is not less than 90A, and a high-pressure rubber pipe can meet the pressure of 30 MPa.
10. The construction method for backfilling a construction trough of a building by vibrating, grouting and ramming according to any one of claims 1 to 7, characterized in that: the method is applied to underground pipe gallery backfilling, abutment backfilling of bridges and culverts or cavity backfilling.
CN202010490788.4A 2020-06-02 2020-06-02 Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method Pending CN111676987A (en)

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