CN110905087A - Steel-concrete composite structure shear part connecting device and construction method thereof - Google Patents
Steel-concrete composite structure shear part connecting device and construction method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 98
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 16
- 229920000881 Modified starch Polymers 0.000 claims description 15
- 235000019426 modified starch Nutrition 0.000 claims description 15
- 239000004368 Modified starch Substances 0.000 claims description 14
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 7
- 239000004220 glutamic acid Substances 0.000 claims description 7
- 239000000176 sodium gluconate Substances 0.000 claims description 7
- 229940005574 sodium gluconate Drugs 0.000 claims description 7
- 235000012207 sodium gluconate Nutrition 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000011178 precast concrete Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 4
- 238000009415 formwork Methods 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920000945 Amylopectin Polymers 0.000 description 1
- 229920000856 Amylose Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B2001/4192—Connecting devices specially adapted for embedding in concrete or masonry attached to concrete reinforcing elements, e.g. rods or wires
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a steel-concrete composite structure shear member connecting device and a construction method thereof, wherein the steel-concrete composite structure shear member connecting device comprises a bottom supporting member and a steel-concrete composite structure shear member positioned on the top of the bottom supporting member; the embedded shear member comprises a groove-shaped plate, I-shaped steel and a concrete structure, wherein the I-shaped steel is positioned at the top of the groove-shaped plate, and the I-shaped steel in the embedded shear member is embedded in the concrete structure in a factory to form a precast concrete plate. The invention can realize the technical effects of quick and reliable connection of the precast concrete plate and the bottom support piece, short construction period and easy replacement of the concrete plate in the whole life cycle, and can be widely applied to the field of quick construction of buildings.
Description
Technical Field
The invention relates to the field of building construction. More particularly, the invention relates to a steel-concrete composite structure shear member connecting device and a construction method thereof.
Background
The reinforced concrete composite structure is a composite structure formed by connecting a concrete slab and a steel structure through a shear member, has the advantages of good construction quality, short construction period and less interference to the environment and traffic at a bridge site compared with a cast-in-place concrete structure, and is widely applied. According to the form of the steel structure, the steel-concrete composite structure can be divided into an I-shaped steel plate beam concrete plate composite structure, a steel box concrete plate composite structure and a corrugated steel web plate concrete plate composite structure.
Under the action of load, the shearing force piece is the key of whether the steel-concrete composite structure concrete slab and the steel structure part can deform and coordinate. At present, the shapes of common shearing parts in a steel-concrete composite structure are mainly as follows: when the steel-concrete composite structure adopts the shear part form, the steel structure and the concrete slab are assembled by two forms of a reserved hole of a post-cast concrete slab shear part or a wet joint between partitioned bridge deck slabs.
Adopt the mode that steel construction and concrete slab are connected to the shear force spare preformed hole of watering after and wet seam in the above-mentioned steel-concrete composite structure work progress, there are following three problems:
(1) the quality of post-cast concrete is difficult to ensure, and the interface of new and old concrete is easy to crack;
(2) the two combination modes have a concrete cast-in-place procedure, the field construction period is longer, and the quick assembly construction of the combined structure is not facilitated;
(3) in the whole life cycle of the bridge, the damaged concrete slab is not easy to replace
Disclosure of Invention
The invention aims to provide a steel-concrete composite structure shear member connecting device for realizing quick and reliable connection between a steel structure part of a steel-concrete composite structure and a concrete slab and a construction method thereof.
To achieve these objects and other advantages in accordance with the present invention, there is provided a steel-concrete composite structure shear connection device including a bottom support member and a steel-concrete composite structure shear member on top thereof;
the steel-concrete combined structure shear part comprises a steel structure and a concrete structure, and the steel structure and the concrete structure are integrally formed into an integral steel-concrete combined structure through pre-pouring.
Preferably, the steel structure comprises, in combination,
the groove-shaped plate is of a groove-shaped structure which is formed by downwards forming a pair of extending parts by two wings of a flat plate;
the grid body is positioned at the top of the groove-shaped plate and is of a net-shaped structure formed by vertically arranging a plurality of horizontal reinforcing steel bars in the transverse bridge direction and the longitudinal bridge direction;
the I-shaped steels are horizontally arranged in the middle of the upper surface of the groove-shaped plate at equal intervals, the distribution direction of I-shaped sections of the I-shaped steels is consistent with that of the reinforcing steel bars in the transverse bridge direction of the grid body, and the reinforcing steel bars in the longitudinal bridge direction of the position where the I-shaped steels are arranged on the top of the groove-shaped plate vertically penetrate through the web plate of each I-shaped steel in the position;
concrete is poured on the upper surface of the grid body, and the grid body and the I-shaped steel are poured and formed into a complete steel-concrete combined structure;
wherein, the I-beams are used as shearing force pieces of the steel-concrete composite structure.
Preferably, the trough plate is located on top of the bottom support and is removably attached thereto.
Preferably, the bottom support comprises a T-shaped steel structure which is a horizontal transverse plate and a vertical plate positioned at the center of the bottom of the transverse plate, a pair of vertical parts are formed downwards on two sides of the transverse plate, and each vertical part is provided with a plurality of first connecting holes;
the pair of extending parts of the groove-shaped plate are also respectively provided with a second connecting hole corresponding to the first connecting holes of the pair of vertical parts, and the groove-shaped plate is just clamped on the outer side of the transverse plate to enable each hole of the first connecting hole and each hole of the second connecting hole to be correspondingly superposed and is arranged in each opposite connecting hole of the corresponding vertical part and each extending part on each side in a penetrating manner through a plurality of bolts.
Preferably, the concrete pouring structure further comprises a plurality of vertical ribs which are vertically arranged on the upper surface of the grid body at equal intervals and embedded in the grid body when concrete is poured on the grid body to form a vertical flexible structure;
wherein, each perpendicular muscle all includes, a pair of perpendicular coexistence and the two leaves gapped steel wire strip to and follow the articulated steel wire gauze that sets up of the clearance top-down of a pair of steel wire strip.
A construction method of a steel-concrete combined structure shear member connecting device comprises the following steps:
s1, prefabricating the channel plate and the I-shaped steel, connecting the I-shaped steel to the center of the upper surface of the channel plate, arranging a plurality of steel bars according to a grid shape with a preset size, finally installing pouring templates around the steel bar grids, completing a concrete pouring process, maintaining, and removing the templates at intervals of preset time to obtain a integrally poured and formed reinforced concrete composite structure;
and S2, hoisting the steel-concrete composite structure in the step S1 to the position right above the bottom support member through a hoisting device, and installing and fixing.
Preferably, the concrete pouring process further comprises the step of adding an accelerator for accelerating the concrete setting during the concrete pouring process, wherein the accelerator comprises the following components:
the weight portions are as follows: 40-60 parts of poly-gamma-glutamic acid, 10-15 parts of superfine limestone powder, 4-6 parts of calcium sulfate, 4-10 parts of sodium gluconate, 2-5 parts of aluminum oxide and 10-20 parts of modified starch.
Preferably, the modified starch is prepared by the following process: mixing the bentonite and the starch in parts by weight, dropwise adding ethanol, heating for 5-10min, mechanically grinding to obtain mixed fine powder, and placing the mixed fine powder into microwave treatment for 10-15 min under the microwave frequency of 2450MHz and the power of 600W to obtain the modified starch.
Preferably, the preparation method of the accelerator comprises the following steps:
a1, adding 2 times of water by weight into the poly-gamma-glutamic acid by weight, dropwise adding 2-5 wt% of dilute sulfuric acid solution to adjust the pH value to 3-5, then adding the sodium gluconate by weight, heating to a reflux state, keeping the temperature at 70-80 ℃, and stirring for 1-2 hours under heat preservation to obtain a material 1;
a2, heating and grinding the modified starch, the superfine limestone powder and the calcium sulfate in parts by weight to 110-;
a3, mixing the material 1 and the material 2, putting the mixture into an ultrasonic processor with the frequency of 20KHZ and the power of 900W for ultrasonic treatment for 5 to 15 minutes, and cooling the mixture to obtain the concrete accelerator.
The invention at least comprises the following beneficial effects:
1. the embedded shear member and concrete are cast into the precast concrete slab in situ, so that the precast concrete slab is more stable, and the phenomenon that the joint interface of new and old concrete is cracked in the subsequent secondary pouring is avoided, so that the stability of a reinforced concrete structure is influenced; secondly, the service life of the integrally formed embedded shear part is far longer than that of a conventional post-cast or cast-in-place steel-concrete composite structure shear part.
2. The construction period is short, the precast concrete slab with the embedded part is transported to a construction site, the bottom support part is installed through the high-strength bolt, a large amount of construction time can be saved, and a large number of construction periods can be saved compared with a pouring mode of post-pouring shear grooves or post-pouring belt concrete.
3. Precast concrete board is easily changed in the steel concrete integrated configuration life cycle, because concrete board and bottom sprag spare pass through high strength bolted connection, for adopting other steel concrete integrated configuration shear force spare devices, the bridge operation in-process decking appears the damaged back, has easily to change, to the little advantage of structural damage.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is an overall structural view of a steel-concrete composite structure according to the present invention;
FIG. 2 is a structural view of an I-beam and channel plate of the present invention;
FIG. 3 is a connection structure view of I-shaped steel, a grid body and a channel plate according to the present invention;
FIG. 4 is a distribution diagram of vertical ribs above a grid body according to the present invention;
fig. 5 is a structural view of the vertical rib of the present invention.
The specification reference numbers indicate: 1. bottom support, 2, grid body, 3, bolt, 4, precast concrete slab, 5, channel plate, 6, I-steel, 7, reinforcing steel, 9, vertical rib, 901, steel wire strip, 902, steel wire fine mesh.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 5, the present invention provides a precast concrete slab shear member connection device, which includes a bottom support member 1 and a steel-concrete composite structure shear member located at the top thereof; the steel-concrete composite structure shear part is a pre-embedded shear part formed by matching I-shaped steel and a groove-shaped plate, and the pre-embedded shear part and concrete are cast in situ to form the precast concrete slab 4.
According to the technical scheme, the pre-embedded shear pieces and the concrete structure are poured in advance and are transported to a construction site for assembly after being dried, so that a large amount of construction time and construction period are saved.
During installation, steel structure materials are prepared completely according to the actual required assembly size, then assembly, fixing and pouring are carried out in sequence, and finally the finished steel-concrete combination is completed.
In another technical solution, the trough-shaped plate 5 comprises a trough-shaped structure formed by two wings of a flat plate downwards to form a pair of extensions;
the I-shaped steels 6 are horizontally arranged in the middle of the upper surface of the trough-shaped plate 5 at equal intervals, the distribution direction of the I-shaped cross sections of the I-shaped steels is consistent with that of the transverse bridge-direction reinforcing steel bars 7 of the grid body 2, and the longitudinal bridge-direction reinforcing steel bars 7 at the positions where the I-shaped steels 6 are arranged on the top of the trough-shaped plate 5 vertically penetrate through the web plate of each I-shaped steel 6 at the positions;
the steel bar reinforced concrete grid structure is characterized by further comprising a grid body 2, wherein the grid body 2 is located at the top of the groove-shaped plate 5, and the grid body 2 is of a net structure formed by vertically arranging a plurality of horizontal steel bars 7 in the transverse bridge direction and the longitudinal bridge direction;
concrete is poured on the upper surface of the grid body 2, and the grid body 2 and the I-shaped steel 6 are poured and formed into a complete precast concrete plate 4;
wherein the plurality of i-beams 6 act as shear members for the precast concrete panel 4.
In the technical scheme, the groove-shaped plate 5 is prefabricated according to the size, then is fixed, a plurality of I-shaped steels 6 are arranged on a flat plate of the groove-shaped plate 5, all the I-shaped steels 6 are sequentially arranged at intervals, wherein the I-shaped steels 6 sequentially comprise an upper top plate, a web plate and a lower bottom plate from top to bottom, are combined to form an I-shaped structure, the length direction of the web plate is consistent with that of the flat plate, and a plurality of connecting holes are drilled along the length direction of the web plate; then, a plurality of horizontal reinforcing steel bars 7 are sequentially inserted along the direction of the hole, the length of the reinforcing steel bars 7 in the transverse arrangement direction is larger than the width of the transverse section of the channel steel, when all the reinforcing steel bars 7 are transversely and longitudinally arranged on the flat plate of the channel steel, the reinforcing steel bars 7 are integrally combined into a latticed shape, the length of the whole latticed shape is larger than the length of the flat plate of the channel steel, a pouring surface for pouring concrete is formed, then a plurality of reinforcing steel bars 7 which are transversely and longitudinally arranged are welded and fixed, concrete is poured on the upper surface of the grid body 2, the pouring thickness is larger than the height of the whole I-shaped steel 6, and the pouring volume also covers the volume of the whole grid body.
In another solution, the trough plate 5 is located on top of the bottom support and is detachably connected to the bottom support.
In another technical scheme, the bottom support 1 comprises a T-shaped steel structure which is a horizontal transverse plate and a vertical plate positioned in the middle of the bottom of the transverse plate, a pair of vertical parts are formed downwards on two sides of the transverse plate, and each vertical part is provided with a plurality of first connecting holes;
the pair of extending portions of the groove-shaped plate 5 are also respectively provided with a second connecting hole corresponding to the first connecting holes of the pair of vertical portions, and the groove-shaped plate 5 is just clamped on the outer side of the transverse plate to enable each hole of the first connecting hole and each hole of the second connecting hole to be correspondingly superposed, and the groove-shaped plate is penetrated and arranged in each opposite connecting hole of the corresponding vertical portion and each extending portion on each side through a plurality of bolts 3.
In the above technical solution, the bottom supporting member 1 is a T-shaped steel structure, and it should be noted that, during design, the vertical portions extending downward from the two ends of the horizontal transverse plate of the T-shaped steel structure are equivalent to a groove shape which is also bent to have a downward opening, and are consistent with the groove-shaped opening of the groove-shaped plate 5, and the two portions need to be connected in a matching manner, that is, the vertical portions extending downward from the horizontal transverse plate of the bottom supporting member 1 and the chamfer dimension of the joint portion between the vertical portion and the transverse plate can be accommodated inside the groove-shaped plate 5; and be provided with on the vertical part of bottom support piece with a pair of extension of channel plate 5 be provided with quantity and the same first connecting hole of diameter, second connecting hole to first connecting hole, second connecting hole one-to-one fix through high strength bolt 3.
In another technical scheme, the concrete pouring structure further comprises a plurality of vertical ribs 8 which are vertically arranged on the upper surface of the grid body 2 at equal intervals, and the vertical ribs 8 are embedded in the grid body 2 when concrete is poured on the grid body to form a vertical tough structure;
each vertical rib 8 comprises a pair of vertical steel wire strips 901 which are vertically parallel and leave a gap therebetween, and a steel wire mesh 902 which is hinged from top to bottom along the gap between the pair of steel wire strips 901.
In above-mentioned technical scheme, many perpendicular muscle 8 sets up the upper surface at grid body 2 through articulated, and highly no longer than the height of whole concrete placement face for form vertical rigid structure, further strengthen the intensity of concrete.
A construction method of a precast concrete plate 4 shear member connecting device comprises the following steps:
s1, prefabricating the trough-shaped plate 5 and the I-shaped steel 6, connecting the I-shaped steel 6 to the center of the upper surface of the trough-shaped plate 5, arranging a plurality of reinforcing steel bars 7 in a grid shape with a preset size, finally installing pouring formworks around the grids of the reinforcing steel bars 7, completing a concrete pouring process, maintaining, and removing the formworks after preset time intervals to obtain the precast concrete plate 4 which is integrally poured and molded;
and S2, hoisting the precast concrete plate 4 in the step S1 to the position right above the bottom support by using a hoisting device for installation and fixation.
In another technical scheme, the concrete pouring process further comprises the step of adding an accelerator for accelerating concrete solidification in the concrete pouring process, wherein the accelerator comprises the following components:
the weight portions are as follows: 40-60 parts of poly-gamma-glutamic acid, 10-15 parts of superfine limestone powder, 4-6 parts of calcium sulfate, 4-10 parts of sodium gluconate, 2-5 parts of aluminum oxide and 10-20 parts of modified starch.
In another technical scheme, the preparation process of the modified starch comprises the following steps: mixing the bentonite and the starch in parts by weight, dropwise adding ethanol, heating for 5-10min, mechanically grinding to obtain mixed fine powder, and placing the mixed fine powder into microwave treatment for 10-15 min under the microwave frequency of 2450MHz and the power of 600W to obtain the modified starch.
In another technical scheme, the preparation method of the accelerator comprises the following steps:
a1, adding 2 times of water by weight into the poly-gamma-glutamic acid by weight, dropwise adding 2-5 wt% of dilute sulfuric acid solution to adjust the pH value to 3-5, then adding the sodium gluconate by weight, heating to a reflux state, keeping the temperature at 70-80 ℃, and stirring for 1-2 hours under heat preservation to obtain a material 1;
a2, heating and grinding the modified starch, the superfine limestone powder and the calcium sulfate in parts by weight to 110-;
a3, mixing the material 1 and the material 2, putting the mixture into an ultrasonic processor with the frequency of 20KHZ and the power of 900W for ultrasonic treatment for 5 to 15 minutes, and cooling the mixture to obtain the concrete accelerator.
In the technical scheme, the poly-gamma-glutamic acid is used as a main raw material, the direct miscibility of the raw materials is enhanced by matching with the modified starch, the water absorption is enhanced by matching with the adsorbent, and the quick setting property and the stability are enhanced and the firmness of concrete is enhanced by further comprising calcium sulfate and sodium gluconate;
wherein the modified starch is a polysaccharide. Unmodified starch structures are generally of two types: amylose and amylopectin, which are polymeric polysaccharides. Modified starches, i.e., water-soluble starches, are often used because of their poor water solubility.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (9)
1. A steel-concrete composite structure shear member connecting device is characterized by comprising a bottom supporting member and a steel-concrete composite structure shear member positioned at the top of the bottom supporting member;
the steel-concrete combined structure shear part comprises a steel structure and a concrete structure, and the steel structure and the concrete structure are integrally formed into an integral steel-concrete combined structure through pre-pouring.
2. The steel-concrete composite structure shear member connection device according to claim 1, wherein the steel structure includes,
the groove-shaped plate is of a groove-shaped structure which is formed by downwards forming a pair of extending parts by two wings of a flat plate;
the grid body is positioned at the top of the groove-shaped plate and is of a net-shaped structure formed by vertically arranging a plurality of horizontal reinforcing steel bars in the transverse bridge direction and the longitudinal bridge direction;
the I-shaped steels are horizontally arranged in the middle of the upper surface of the groove-shaped plate at equal intervals, the distribution direction of I-shaped sections of the I-shaped steels is consistent with that of the reinforcing steel bars in the transverse bridge direction of the grid body, and the reinforcing steel bars in the longitudinal bridge direction of the position where the I-shaped steels are arranged on the top of the groove-shaped plate vertically penetrate through the web plate of each I-shaped steel in the position;
concrete is poured on the upper surface of the grid body, and the grid body and the I-shaped steel are poured and formed into a complete steel-concrete combined structure;
wherein, the I-beams are used as shearing force pieces of the steel-concrete composite structure.
3. The steel-concrete composite structure shear member connecting device according to claim 1 or 2, wherein the groove-shaped plate is positioned on the top of the bottom support member, and the groove-shaped plate and the bottom support member are detachably connected.
4. The steel-concrete composite structure shear member connecting device according to claim 1 or 2, wherein the bottom supporting member comprises a T-shaped steel structure which is a horizontal cross plate and a vertical plate located at the center of the bottom of the cross plate, a pair of vertical portions are formed downwards on two sides of the cross plate, and each vertical portion is provided with a plurality of first connecting holes;
the pair of extending parts of the groove-shaped plate are also respectively provided with a second connecting hole corresponding to the first connecting holes of the pair of vertical parts, and the groove-shaped plate is just clamped on the outer side of the transverse plate to enable each hole of the first connecting hole and each hole of the second connecting hole to be correspondingly superposed and is arranged in each opposite connecting hole of the corresponding vertical part and each extending part on each side in a penetrating manner through a plurality of bolts.
5. The steel-concrete composite structure shear member connecting device according to claim 2, further comprising a plurality of vertical ribs vertically arranged on the upper surface of the lattice body at equal intervals and forming a vertical flexible structure by embedding the vertical ribs therein when concrete is poured on the lattice body;
wherein, each perpendicular muscle all includes, a pair of perpendicular coexistence and the two leaves gapped steel wire strip to and follow the articulated steel wire gauze that sets up of the clearance top-down of a pair of steel wire strip.
6. A construction method of a steel-concrete combined structure shear member connecting device is characterized by comprising the following steps:
s1, prefabricating the channel plate and the I-shaped steel, connecting the I-shaped steel to the center of the upper surface of the channel plate, arranging a plurality of steel bars according to a grid shape with a preset size, finally installing pouring templates around the steel bar grids, completing a concrete pouring process, maintaining, and removing the templates at intervals of preset time to obtain a integrally poured and formed reinforced concrete composite structure;
and S2, hoisting the steel-concrete composite structure in the step S1 to the position right above the bottom support member through a hoisting device, and installing and fixing.
7. The construction method of the steel-concrete composite structure shear member connecting device according to claim 6, wherein the concrete pouring process further comprises the step of adding an accelerator for accelerating the solidification of concrete during the concrete pouring process, wherein the accelerator comprises the following components:
the weight portions are as follows: 40-60 parts of poly-gamma-glutamic acid, 10-15 parts of superfine limestone powder, 4-6 parts of calcium sulfate, 4-10 parts of sodium gluconate, 2-5 parts of aluminum oxide and 10-20 parts of modified starch.
8. The construction method of the steel-concrete composite structure shear member connecting device according to claim 7, wherein the modified starch is prepared by the following steps: mixing the bentonite and the starch in parts by weight, dropwise adding ethanol, heating for 5-10min, mechanically grinding to obtain mixed fine powder, and placing the mixed fine powder into microwave treatment for 10-15 min under the microwave frequency of 2450MHz and the power of 600W to obtain the modified starch.
9. The construction method of the steel-concrete composite structure shear member connecting device according to claim 7, wherein the preparation method of the accelerator comprises the following steps:
a1, adding 2 times of water by weight into the poly-gamma-glutamic acid by weight, dropwise adding 2-5 wt% of dilute sulfuric acid solution to adjust the pH value to 3-5, then adding the sodium gluconate by weight, heating to a reflux state, keeping the temperature at 70-80 ℃, and stirring for 1-2 hours under heat preservation to obtain a material 1;
a2, heating and grinding the modified starch, the superfine limestone powder and the calcium sulfate in parts by weight to 110-;
a3, mixing the material 1 and the material 2, putting the mixture into an ultrasonic processor with the frequency of 20KHZ and the power of 900W for ultrasonic treatment for 5 to 15 minutes, and cooling the mixture to obtain the concrete accelerator.
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