CN210263113U - Light prefabricated assembled concrete slab column foundation - Google Patents
Light prefabricated assembled concrete slab column foundation Download PDFInfo
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- CN210263113U CN210263113U CN201920966614.3U CN201920966614U CN210263113U CN 210263113 U CN210263113 U CN 210263113U CN 201920966614 U CN201920966614 U CN 201920966614U CN 210263113 U CN210263113 U CN 210263113U
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Abstract
The utility model discloses a light prefabricated assembled concrete slab column foundation, which comprises a prefabricated lightweight aggregate concrete column and an assembled lightweight aggregate concrete bottom plate, wherein the end of a longitudinal steel bar of the prefabricated column is connected with a connecting sleeve, one end of the connecting sleeve is flush with the concrete bottom surface of the column, and the prefabricated bottom plate extends out of a reserved steel bar with a certain length; the bottom plate is combined into a whole through the connecting piece and connected with the upright post through the connecting sleeve in a grouting mode. The utility model can significantly improve the construction efficiency of the foundation, save the transportation cost and reduce the construction and hoisting difficulty; the capability of resisting adverse environmental influences of the foundation is enhanced, and the service life of the foundation is prolonged; energy and resources are saved, and the pressure on the environment is reduced.
Description
Technical Field
The utility model relates to an engineering technical field, a prefabricated assembled concrete slab column basis of light-duty change that field such as concretely relates to electric power, communication, building were used.
Background
More and more lifeline projects such as electric power and communication, important buildings (structures) and the like need to pass through areas with difficult excavation, concrete pouring and maintenance such as deserts, permafrost, river networks, swamps, beaches and coastal soft soil and the like; concrete foundations in severe cold and corrosive areas can be damaged by single or multiple actions such as freeze thawing, sulfate corrosion, steel bar corrosion, carbonization, abrasion and the like, so that the engineering safety is threatened; in addition, the quality of the concrete is difficult to ensure by mixing, pouring and curing the concrete on site in severe environment. In order to overcome the problems of difficult construction, difficult quality guarantee, poor durability and the like in special areas, the prefabricated assembly type foundation is increasingly applied in engineering practice by the advantages of rapid excavation and backfilling, easy quality control and good durability.
In recent years, as the scale and the grade of engineering construction are getting larger and larger, the acting force of the foundation is gradually increased, the self weight and the size of the prefabricated concrete foundation are also increased, the difficulty and the comprehensive cost of transportation and hoisting are increased, and particularly in areas such as mountainous areas, plateaus, river network mud and marsh and the like with inconvenient traffic and severe construction conditions, the popularization and the application of the prefabricated concrete foundation are severely restricted; in addition, corrosive and severe cold freeze-thaw areas have a severe impact on the durability of concrete foundations, and have become a major safety risk for engineering operations and uses. In order to make the foundation construction more convenient, economic, safe and reliable, a light prefabricated concrete slab column foundation is needed.
The existing prefabricated assembly type foundations comprise prefabricated concrete block assembly type foundations, assembly type foundations formed by combining concrete laths and section steel and the like, and relate to the following problems that ① prefabricated concrete components are all poured by common concrete, and the volume weight of the prefabricated concrete components is 2350kg/m3～2400kg/m3The self-weight of concrete is large, transportation can consume a large amount of resources, ② prefabricated parts are large in self weight and volume, the hoisting difficulty is increased, and the transportation difficulty of machines and tools required for hoisting is correspondingly increased, ③ in a corrosive area, a section steel member is easy to corrode and destroy and is not beneficial to engineering safety, sulfate ions and chloride ions in corrosive soil can erode a concrete foundation, common concrete is greatly influenced under a freeze-thaw environment, the service life of the concrete is shortened, the safe operation of engineering is influenced, ④ in a severe environment, the freeze-thaw damage can be easily caused to the common concrete, the strength loss can reach 16.2%, ⑤ due to various changes of foundation acting force and geological conditions, the size specification of a foundation design is large, the existing assembly type foundation is difficult to produce in batch and reduce the manufacturing cost, ⑥ the existing assembly type foundation mainly adopts bolts for connecting prefabricated parts, the construction amount is large, the durability under a corrosive environment is poor, the reliability of connection is influenced, ⑦ a large amount of natural concrete needs to consume, and is not beneficial to environmental protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art, the utility model provides a light-duty prefabricated assembled concrete slab column foundation is provided, and this basis has characteristics such as light-duty, the low, the construction of overall structure of light-duty, cost of transportation is swift, structural integrity is good, durability height, and the influence in the bad soil property area of solution that can be better reaches convenient economy, energy-concerving and environment-protective effect.
In order to realize the purpose, the utility model discloses a technical scheme be:
a lightweight precast fabricated concrete panel column foundation comprising:
the upper surface of the bottom plate extends to form a reserved steel bar;
the upright post is of a hollow or solid structure; the bottom of the longitudinal steel bar of the upright post is connected with a connecting sleeve, the lower end of the connecting sleeve is connected with the reserved steel bar, the connecting sleeve is filled with grouting material, and the upright post and the bottom plate are connected into a whole through the connecting sleeve and the grouting material;
the bottom plate and the upright posts are both prefabricated by lightweight aggregate concrete and reinforcing steel bars.
Preferably, the bottom end of the connecting sleeve is flush with the bottom end of the upright post, and the reserved steel bars stretch into the connecting sleeve.
Preferably, the connecting sleeve comprises a sleeve body, a sealing plug is arranged at the joint of the upper end of the sleeve body and the longitudinal steel bar, and an opening at the lower end of the sleeve body is connected with the reserved steel bar; the sleeve body is provided with a grout outlet and a grouting hole.
Preferably, the inner wall of the sleeve body is provided with shear keys which are arranged in a staggered mode.
Preferably, the grout outlet of the connecting sleeve is arranged at the upper part of the sleeve body, and the grouting hole is arranged at the lower part of the sleeve body.
Preferably, the anchoring and extending length of the reinforcing steel bars at the two ends of the sleeve body is not less than 8 times of the nominal diameter of the reinforcing steel bars; the total length of the sleeve body is not less than 18 times of the nominal diameter of the steel bar; the outer diameter of the sleeve body is not less than 2.5 times of the nominal diameter of the steel bar.
Preferably, the bottom plate on be provided with the concrete filler strip, the concrete filler strip sets up in stand bottom periphery, pack in the interval that the concrete filler strip encloses the grout.
Preferably, the bottom plate for assembling the structure, its first precast concrete component and the second precast concrete component that can assemble into the cuboid structure all are provided with the prestressing tendons preformed hole that runs through on first precast concrete component and the second precast concrete component, first precast concrete component and second precast concrete component carry out the prestressing force through prestressing tendons preformed hole and connect.
Preferably, the first precast concrete component is L-shaped, and the second precast concrete component is inverted T-shaped; the second precast concrete component is arranged in the middle, and the first precast concrete components are arranged on two sides of the second precast concrete component; and the reserved steel bars are arranged on the upper surface of the second precast concrete member.
Preferably, the prestressed tendon preformed hole is prefabricated by a corrugated pipe.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model adopts a light prefabricated assembly type structure, which is composed of a bottom plate and a stand column arranged on the bottom plate, and the prefabricated assembly type structure can obviously improve the construction efficiency of the foundation, save the transportation cost and reduce the construction hoisting difficulty; the connecting sleeve reinforces the upright post and the bottom plate, enhances the capability of the foundation for resisting adverse environmental influence, and prolongs the service life of the foundation; energy and resources are saved, and the pressure on the environment is reduced. The lightweight aggregate concrete applied in engineering practice has the advantages of reducing the self weight of the structure, improving the transportation and hoisting efficiency of the member and the like, and compared with the conventional cast-in-place foundation with the same volume, the self weight of the foundation can be reduced by about 15 percent; the self-curing capability of the lightweight aggregate concrete can ensure that the hardened set cement is more compact and the curing period of the concrete before freezing is prolonged; the porous aggregate can also effectively reduce the huge stress formed by the reaction of the lightweight aggregate and alkaline substances in the concrete; the light aggregate is mostly processed from industrial wastes such as fly ash, slag, coal gangue and the like, and when the light aggregate is applied in engineering practice, the corrosion resistance of the foundation can be improved, the demand on natural stones is reduced, and the pressure on the environment is relieved.
The prefabricated bottom plate is assembled into a main body by applying prestress through the prestressed tendons, so that the prefabricated bottom plate is stressed cooperatively, and the construction is simple, convenient and quick. The prefabricated upright post and the bottom plate are connected by the connecting sleeve, and the reinforcing steel bars in the connecting sleeve are in the homogeneous grouting material, so that the stress performance is better; the gap between the connecting sleeve and the connecting steel bar can correct the deviation of the prefabricated part in the manufacturing process, so that the installation of the prefabricated part is facilitated; the component hoisting and steel bar connecting processes can be separated, so that the construction efficiency is improved; the connecting sleeve has reliable performance, and can ensure the connecting quality and the structural safety of the components.
If the high-strength lightweight aggregate concrete prefabricated stand column is adopted, the variable-section expansion head can be adopted at the top of the stand column so as to ensure that the expansion head part has enough sections and adopts foundation bolts or inserted angle steel to connect an upper structure, and the section size of the stand column can be reduced as much as possible on the premise that the bearing capacity of a component is met by other parts of the stand column, so that the consumption of concrete is reduced.
Compared with the common prefabricated assembly type foundation, the utility model adopts the lightweight aggregate concrete to replace the common concrete, thereby greatly reducing the dead weight of the prefabricated components; the transportation cost of the component is reduced, and the hoisting and construction efficiency is improved; the porous lightweight aggregate can resist uneven stress generated in the concrete, and the integral stability of the foundation is ensured; the light aggregate processed by industrial waste replaces natural macadam, so that the pressure on the environment can be reduced, the energy and resources are saved, and the environment protection is facilitated; the antifreezing and corrosion resistant capability is excellent, and conditions are provided for engineering to pass through severe cold, corrosive and other areas with severe environments; by adopting the connecting sleeve grouting connection process, the rapid construction is realized in the places with difficult pit formation or maintenance, such as deserts, permafrost, river networks, swamps, beaches, coastal soft soil and the like, the construction operation and the environmental protection are facilitated, and the safety risk is reduced; the foundation integrity is better; aiming at different foundation acting forces and geological environments, the turnover and superposition of the prefabricated battens with different numbers can be realized when different foundation sizes are required to be set, and the prefabricated battens can be shaped by adopting modular standard parts, so that the batch stable production of factories is facilitated, and the manufacturing cost is reduced.
Drawings
The present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of a prefabricated lightweight aggregate concrete fabricated foundation structure;
FIG. 2 is a schematic view of the coupling sleeve of FIG. 1;
FIG. 3 is a schematic diagram of a prefabricated lightweight aggregate concrete assembled bottom plate, wherein (a) is a front view, (b) is a top view of a strip-shaped assembled bottom plate, and (c) is a top view of a block-shaped assembled bottom plate;
FIG. 4 is a schematic view of the connection of prefabricated lightweight aggregate concrete fabricated foundation steel bar connection sleeves;
FIG. 5 is a detailed view of two forms of prefabricated lightweight aggregate concrete composite bottom plate members, wherein (a) is an L-shaped concrete composite bottom plate, and (b) is an inverted T-shaped concrete composite bottom plate;
in the drawings: 1-upright column; 2-connecting the sleeve; 3-a bottom plate; 4-concrete spacer; 5-prestressed tendons; 6-reserving reinforcing steel bars; 7-prefabricating a lightweight aggregate concrete slab; 8-embedded parts; 9-reserving holes for prestressed tendons; 10-a sealing plug; 11-grouting material; 12-slurry outlet holes; 13-grouting holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the present invention relates to a lightweight precast assembled concrete slab column foundation, including:
the upper surface of the bottom plate 3 extends to form a reserved steel bar 6;
the bottom plate 3 is of an assembled structure;
the upright post 1 is of a hollow or solid structure; the bottom of a longitudinal steel bar of the upright post 1 is connected with a connecting sleeve 2, the lower end of the connecting sleeve 2 is connected with a reserved steel bar 6, the connecting sleeve 2 is filled with grouting material 11, and the upright post 1 and the bottom plate 3 are connected into a whole through the connecting sleeve 2 and the grouting material 11;
the bottom plate 3 and the upright posts 1 are both prefabricated by lightweight aggregate concrete and reinforcing steel bars.
Wherein, connecting sleeve 2 bottom and 1 bottom parallel and level of stand, reserve reinforcing bar 6 and stretch into in the connecting sleeve 2.
The connecting sleeve 2 comprises a sleeve body, a sealing plug 10 is arranged at the joint of the upper end of the sleeve body and the longitudinal steel bar, and an opening at the lower end of the sleeve body is connected with the reserved steel bar 6; the sleeve body is provided with a grout outlet 12 and a grouting hole 13. The inner wall of the sleeve body is provided with shear keys which are arranged in a staggered mode. The grout outlet 12 of the connecting sleeve 2 is arranged at the upper part of the sleeve body, and the grouting hole 13 is arranged at the lower part of the sleeve body. The anchoring and extending length of the reinforcing steel bars at the two ends of the sleeve body is not less than 8 times of the nominal diameter of the reinforcing steel bars; the total length of the sleeve body is not less than 18 times of the nominal diameter of the steel bar; the outer diameter of the sleeve body is not less than 2.5 times of the nominal diameter of the steel bar.
Preferably, be provided with concrete filler strip 4 on the bottom plate 3, concrete filler strip 4 sets up in 1 bottom periphery of stand, and the interval intussuseption that concrete filler strip 4 encloses fills grout 11.
The bottom plate 3 for assembling the structure, it is including the first precast concrete component 7a and the second precast concrete component 7b that can assemble into the cuboid structure, all be provided with the prestressing tendons preformed hole 9 that runs through on first precast concrete component 7a and the second precast concrete component 7b, first precast concrete component 7a and second precast concrete component 7b carry out the prestressing force through prestressing tendons preformed hole 9 and connect. The prestressed tendon preformed hole 9 is prefabricated by a corrugated pipe.
Preferably, the first precast concrete member 7a is L-shaped, the second precast concrete member 7b is inverted T-shaped, and other members capable of being assembled into a rectangular parallelepiped structure may also be shaped; the second precast concrete unit 7b is disposed in the middle, and the first precast concrete units 7a are disposed at both sides of the second precast concrete unit 7 b; the reserved steel bars 6 are arranged on the upper surface of the second precast concrete member 7 b.
The density interval of the lightweight aggregate concrete is 1500kg/m3～1950kg/m3(ii) a In units of kg/m3The lightweight aggregate concrete comprises the following raw materials in proportion:
cement: fine aggregate: light coarse aggregate: fly ash: silicon powder: high-efficiency water reducing agent: 298 parts of water: 662: 645: 187: 50: 4.28: 165.
the utility model also provides a construction method of light-duty prefabricated assembled concrete slab column basis, including following step:
1) the components of the bottom plate 3 and the upright post 1 are prefabricated and formed by adopting light aggregate concrete, wherein the connecting sleeve 2 is required to be arranged on the bottom side of the longitudinal steel bar of the upright post 1 in advance, and the reserved steel bar 6 of the bottom plate 3 is required to extend out by enough length;
2) assembling the bottom plate 3 on a construction site, and hoisting the upright post 1 to be combined with the bottom plate integral body 3 according to the position of the reserved steel bar 6; installing a concrete cushion strip 4;
3) grouting material 11 is poured into the connecting sleeve 2, and the grouting material 11 flows out after filling the inside of the connecting sleeve 2 until filling the area between the concrete cushion strips 4.
Specifically, referring to fig. 1 and 2, the utility model mainly comprises a lightweight aggregate concrete hollow or solid upright column 1 and a lightweight aggregate concrete assembled bottom plate 3, which are connected into a whole by a connecting sleeve 2; the tail end of the longitudinal steel bar of the upright post 1 is connected with a connecting sleeve 2, and the bottom end of the connecting sleeve 2 is flush with the concrete bottom surface of the upright post 1; the top of the upright post 1 can be used as a variable cross-section expanding head, so that the expanding head part has enough cross section and is connected with an upper tower by adopting foundation bolts or inserting angle steel.
Referring to fig. 5, concrete cushion strips 4 are symmetrically arranged on a bottom plate 3 to form a closed rectangle; the bottom plate 3 is formed by splicing a first precast concrete member 7a and a second precast concrete member 7b, and prestressed connection is carried out between the first precast concrete member and the second precast concrete member through a prestressed tendon preformed hole 9; the center of the second precast concrete member 7b extends out of the steel bar 6 with a certain length, and the extending length of the steel bar meets the requirement of steel bar connection.
Referring to fig. 4, the connecting sleeve structure for connecting the upright column and the bottom plate is shown in the figure, and the reserved steel bars 6 are connected with the connecting steel bars of the upright column 1 through the connecting sleeve 2; the grout outlet 12 is positioned at one side of the column connecting steel bar, the grouting hole 13 is positioned at one side of the reserved steel bar, and a sealing plug 10 is arranged between the column 1, the connecting sleeve 2 and the steel bar.
Referring to fig. 4, the prefabricated lightweight aggregate concrete laths 7 shown in the figure are adopted for splicing the bottom plate, wherein the first prefabricated concrete member 7a can be symmetrically split into two parts; the second precast concrete member 7b is integrally and directly connected with the foundation column, and a connecting steel bar 6 is reserved; the first precast concrete members 7a are symmetrically arranged at two sides of the second precast concrete member 7b to finally form a whole bottom plate; the preformed holes 9 are transversely and symmetrically distributed along the lath, wherein the distance between the preformed holes of the middle prestressed tendons is not less than the size of the upright post, and the preformed holes of the prestressed tendons are prefabricated by corrugated pipes; after the bottom plate is spliced, prestressed tendon construction is carried out through the prestressed tendon preformed holes 9, so that the bottom plate is formed into a reliable whole.
The bottom of a longitudinal steel bar of the prefabricated hollow or solid upright post 1 is connected with a connecting sleeve 2, and the bottom end of the connecting sleeve is flush with the concrete bottom end of the upright post; the bottom plate 3 extends out of a steel bar 6 with a certain length and is connected with the upright post into a whole through connecting sleeve grouting.
The lightweight aggregate concrete is prepared from lightweight coarse aggregate, lightweight sand or common sand, cement, cementing material fly ash, silicon powder or slag and the like, a high-performance water reducing agent and water.
2 one end and stand bar connection of connecting sleeve, the other end and stand concrete bottom parallel and level, be close to the stand bottom and leave the slip casting hole, the upper portion leaves out the thick liquid hole.
The bottom plate 3 comprises two types of lightweight aggregate concrete prefabricated laths 7a and 7b, the members 7b are directly connected with the foundation columns through the reserved steel bars 6, the members 7a are symmetrically arranged on two sides of the members 7b and spliced into a whole, and the prestressed reinforcement construction is carried out through the prestressed reinforcement reserved holes 9.
The prefabricated laths 7a and 7b are symmetrically provided with prefabricated prestressed tendon preformed holes of corrugated pipes at the same height of the cross section, and the prefabricated laths 7a can be arranged with different widths of the foundation slab in a continuous overturning and stacking manner.
The top section of the hollow or solid upright post 1 is larger than the lower section thereof, thus forming a variable section enlarged head form.
The utility model discloses light-duty prefabricated assembled basis concrete implementation process as follows:
(1) prefabrication of light aggregate concrete member
Calculating the volume of the needed lightweight aggregate concrete according to a basic design drawing, and weighing the materials according to the needed strength grade; binding a reinforcement cage and a supporting template in sections according to a foundation design drawing; the bottom sides of the longitudinal steel bars of the upright posts need to be connected with sleeves in advance, sealing plugs are arranged between the connecting sleeves and the steel bars of the upright posts, and the bottom surfaces of the connecting sleeves are flush with the concrete bottom ends of the upright posts after pouring forming; the bottom plate should ensure the assembly positions to be matched; the bottom plate reinforcing steel bars should extend out to a sufficient length and should be consistent with the plane position of the vertical reinforcing steel bars of the upright posts.
According to the preparation method of the lightweight aggregate concrete for the prefabricated foundation, the lightweight aggregate concrete pouring member is prepared and maintained to the required strength.
(2) Transporting and assembling foundation
And (4) transporting the prefabricated lightweight aggregate concrete member to a construction site, excavating and leveling the foundation pit, and assembling the prefabricated lightweight aggregate concrete member after the pit bottom is leveled and compacted. Firstly, hoisting the concrete lath 7b to the center of the bottom of the foundation pit, symmetrically hoisting the concrete lath 7a after aligning, and enabling all parts of the bottom plate to be tightly compacted and the assembled interfaces to be matched; the prestressed reinforcement 5 is constructed to enable the base plate to be assembled into a whole, and the base plate is guaranteed to be stressed cooperatively; hoisting the upright post 1 to be combined with the whole bottom plate 3 according to the position of the reserved steel bar 6; the concrete shim bars 4 are installed.
Special equipment is used for grouting, grouting material 11 is prepared strictly according to a specified proportioning method, and the prepared grouting material is poured into the special equipment after being uniformly stirred, so that the slump of the grouting material is ensured; the grouting material should be used up within 0.5h after preparation.
Grouting equipment is used for performing pressure grouting through the grouting holes 13, and grouting materials flow out of the grout outlet holes 12 after filling the interior of the connecting sleeve; in order to fill the connecting sleeve with grouting material and ensure that no obvious gap exists between the upright post 1 and the bottom plate 3, the grouting material is continuously discharged from the grout outlet until the area between the concrete cushion strips 4 is filled, and the surface is leveled.
Examples
The utility model relates to a light-duty prefabricated assembled concrete slab column basis, including prefabricated lightweight aggregate concrete foundation column and the bottom plate that can splice, connect equipment, the bottom plate is whole to be connected with foundation column through adapter sleeve grout through prestressing tendons between the bottom plate.
The light aggregate concrete with prefabricated foundation has strength not lower than LC30 level, impermeability grade not lower than P4 level and density interval of 1500kg/m3～1950kg/m3. Taking LC35 grade lightweight aggregate concrete as an example, the mixing proportion is (unit: kg/m)3)：
Cement: fine aggregate: light coarse aggregate: fly ash: silicon powder: high-efficiency water reducing agent: 298 parts of water: 662: 645: 187: 50: 4.28: 165.
the cement is P.O 42.5.5R ordinary portland cement with stable quality and better performance, a compatibility test needs to be carried out on the cement and a polycarboxylic acid high-performance water reducing agent before use, and the performance of the cement is not lower than the related requirements of general portland cement (GB 175-2007).
The fine aggregate is medium coarse river sand with hard texture, smooth particles and good gradation, and the quality of the fine aggregate is not lower than the requirements related to the quality and inspection method standards for common concrete sand and stone (JC/T52-2006) and the construction sand (GB/T14684-2011).
The light coarse aggregate is crushed stone ceramsite with the density grade of 800, the continuous size grade is adopted, and the quality of the light coarse aggregate is not lower than that of the part 1 of the light aggregate and the test method thereof: light aggregate (GB/T17431.1-2010) related requirements.
The fly ash is high-quality class I fly ash produced by a power plant with an advanced coal burning process, and the quality of the fly ash is not lower than the related requirements of fly ash used in cement and concrete (GB/T1596-2017).
The silicon powder is high-quality silicon powder produced in factories with advanced smelting process, and the quality of the silicon powder is not lower than the relevant requirements of silica fume for mortar and concrete (GB/T27690-2011).
The high-efficiency water reducing agent is a polycarboxylic acid high-performance water reducing agent containing an air entraining agent, the water reducing rate is not lower than 25%, the air content is not lower than 8%, and the quality is not lower than the requirements related to concrete admixture application technical specifications (GB 50119-2013) and polycarboxylic acid high-performance water reducing agent (JG/T223-2017).
The concrete mixing water is tap water, and the quality of the tap water is not lower than the requirements related to the concrete water standard (JGJ 63-2006).
The utility model also provides a preparation method of lightweight aggregate concrete of prefabricated assembled basis, concrete process steps are as follows:
a) 4.28kg/m of polycarboxylic acid high-performance water reducing agent containing air entraining agent3Adding 165kg/m of weighed water3Stirring slowly for two minutes;
b) weighing 298kg/m according to the weight ratio3662kg/m of cement3645kg/m of fine aggregate3Is coarseAggregate 187kg/m3Fly ash and 50kg/m3The silicon powder of (2);
c) b, sequentially adding the weighed cement, fly ash and silicon powder into a forced mixer, uniformly stirring for 3-4 minutes, adding 1/4 about the mixture obtained in the step a, and stirring for 2-3 minutes;
d) b, adding weighed fine aggregate, adding about 1/4 into the mixture obtained in the step a, and stirring for 1-2 minutes;
e) b, adding weighed coarse aggregate, adding 1/4 to the mixture obtained in the step a, and stirring for 1-2 minutes;
f) and c, adding the mixture left in the step a, uniformly stirring for 3-4 minutes, and discharging to obtain the prepared concrete mixture.
The utility model relates to a grout connecting sleeve for prefabricating assembly type foundation, the inner wall of which is provided with shear keys which are arranged in a staggered way, one end of the connecting sleeve is connected with the longitudinal bars of the prefabricated stand column and is provided with a sealing plug, and the other end is open and is connected with the reserved steel bars; a grout outlet is arranged near the connecting end with the upright post, and a grouting hole is arranged near the connecting end with the bottom plate steel bar; and the prefabricated stand column and the prefabricated bottom plate are connected by pouring high-strength grouting material through the connecting sleeve.
The connecting sleeve can be formed by ductile cast iron fine casting, the quality of the connecting sleeve is not lower than the requirements related to grouting connecting sleeve for connecting steel bars (JG/T398-2012), and the tensile strength of the connecting sleeve is not less than 1.2 times of the tensile strength of the connected steel bars and is not less than 600 MPa.
The anchoring and extending length of the reinforcing steel bars at the two ends of the connecting sleeve is not less than 8 times of the nominal diameter of the reinforcing steel bars; the total length of the connecting sleeve is not less than 18 times of the nominal diameter of the steel bar; the outer diameter of the connecting sleeve is not less than 2.5 times of the nominal diameter of the steel bar.
The cement used by the grouting material is P.O 42.5.5R ordinary portland cement, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent containing an air entraining agent, and the quality of the water reducing agent is the same as that of lightweight aggregate concrete.
The 1d strength of the grouting material is not less than 35MPa, and the 3d strength of the grouting material is not less than 60 MPa.
The utility model discloses a bottom plate can be assembled on prefabricated assembled basis comprises the precast concrete lath of two kinds of patterns, at four connecting holes of transverse section same position symmetrical arrangement, it is prefabricated by the bellows and forms.
The light aggregate concrete adopted by the foundation of the utility model can greatly improve the durability of the foundation, save energy and resources and reduce the pressure on the environment; the prefabricated components are connected through the connecting sleeves, so that the integrity of the prefabricated structure is ensured, and the construction efficiency can be improved; the utility model has the advantages that the whole self-weight of the foundation is reduced, the size of the prefabricated part is reduced, the transportation cost is saved, and the hoisting difficulty is reduced; by adopting the prefabricated parts, the construction period can be shortened, the pouring quality of concrete is ensured, the construction difficulty and the safety risk of a foundation pit of a bad foundation are reduced, and the application range of the fabricated foundation under the conditions of inconvenient traffic and severe environment is widened.
Claims (10)
1. A lightweight precast fabricated concrete panel column foundation comprising:
the upper surface of the bottom plate (3) extends to form a reserved steel bar (6);
the upright post (1), wherein the upright post (1) is of a hollow or solid structure; the bottom of a longitudinal steel bar of the upright post (1) is connected with a connecting sleeve (2), the lower end of the connecting sleeve (2) is connected with a reserved steel bar (6), grouting material (11) is filled in the connecting sleeve (2), and the upright post (1) and the bottom plate (3) are connected into a whole through the connecting sleeve (2) and the grouting material (11);
the bottom plate (3) and the upright posts (1) are both prefabricated by lightweight aggregate concrete and reinforcing steel bars.
2. A lightweight precast fabricated concrete panel column foundation as set forth in claim 1, wherein the bottom ends of said connecting sleeves (2) are flush with the bottom ends of the columns (1), and the reinforcing bars (6) are inserted into the connecting sleeves (2).
3. The lightweight precast fabricated concrete panel column foundation as claimed in claim 1, wherein the connection sleeve (2) comprises a sleeve body, a sealing plug (10) is provided at the connection of the upper end of the sleeve body and the longitudinal reinforcing steel bars, and the lower end of the sleeve body is opened to be connected with the reserved reinforcing steel bars (6); the sleeve body is provided with a grout outlet (12) and a grouting hole (13).
4. The lightweight precast fabricated concrete panel column foundation of claim 3, wherein the inner wall of the sleeve body is provided with shear keys in a staggered arrangement.
5. A lightweight precast fabricated concrete panel column foundation as set forth in claim 3, wherein the grout outlet hole (12) of the connection sleeve (2) is provided at an upper portion of the sleeve body, and the grout inlet hole (13) is provided at a lower portion of the sleeve body.
6. The lightweight precast fabricated concrete panel column foundation of claim 3, wherein the reinforcing bars at both ends of the sleeve body are anchored to extend into a length not less than 8 times the nominal diameter of the reinforcing bars; the total length of the sleeve body is not less than 18 times of the nominal diameter of the steel bar; the outer diameter of the sleeve body is not less than 2.5 times of the nominal diameter of the steel bar.
7. The lightweight precast assembled concrete slab column foundation as claimed in claim 1, wherein the bottom plate (3) is provided with a concrete spacer (4), the concrete spacer (4) is provided at the outer periphery of the bottom of the column (1), and the space surrounded by the concrete spacer (4) is filled with the grouting material (11).
8. The lightweight precast assembled concrete slab column foundation as recited in claim 1, wherein said bottom plate (3) is a fabricated structure including a first precast concrete member (7a) and a second precast concrete member (7b) which can be fabricated into a rectangular parallelepiped structure, the first precast concrete member (7a) and the second precast concrete member (7b) are respectively provided with a tendon-reserved hole (9) therethrough, and the first precast concrete member (7a) and the second precast concrete member (7b) are connected by prestressing through the tendon-reserved hole (9).
9. The lightweight precast fabricated concrete panel column foundation of claim 8, wherein the first precast concrete member (7a) is L-shaped, and the second precast concrete member (7b) is inverted T-shaped; the second precast concrete unit (7b) is arranged in the middle, and the first precast concrete units (7a) are arranged on two sides of the second precast concrete unit (7 b); and the reserved steel bars (6) are arranged on the upper surface of the second precast concrete member (7 b).
10. The lightweight precast concrete panel column foundation of claim 8, wherein the tendon whereas holes (9) are precast by corrugated pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920966614.3U CN210263113U (en) | 2019-06-25 | 2019-06-25 | Light prefabricated assembled concrete slab column foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110284516A (en) * | 2019-06-25 | 2019-09-27 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of lightness prefabricated assembled concrete sheet-pile basis and its construction method |
| CN111946556A (en) * | 2020-07-29 | 2020-11-17 | 上海市机电设计研究院有限公司 | Construction positioning method for precast concrete shell ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284516A (en) * | 2019-06-25 | 2019-09-27 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of lightness prefabricated assembled concrete sheet-pile basis and its construction method |
| CN110284516B (en) * | 2019-06-25 | 2024-02-06 | 中国电力工程顾问集团西北电力设计院有限公司 | Light prefabricated concrete slab column foundation and construction method thereof |
| CN111946556A (en) * | 2020-07-29 | 2020-11-17 | 上海市机电设计研究院有限公司 | Construction positioning method for precast concrete shell ring |
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