CN111827681A - Grouting process for longitudinal prefabricated part - Google Patents
Grouting process for longitudinal prefabricated part Download PDFInfo
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- CN111827681A CN111827681A CN202010718916.6A CN202010718916A CN111827681A CN 111827681 A CN111827681 A CN 111827681A CN 202010718916 A CN202010718916 A CN 202010718916A CN 111827681 A CN111827681 A CN 111827681A
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- grouting
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 130
- 239000010959 steel Substances 0.000 claims abstract description 130
- 230000001154 acute effect Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 19
- 239000011440 grout Substances 0.000 claims description 17
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005491 wire drawing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
A grouting process for a longitudinal prefabricated part comprises a sleeve and a connecting assembly, wherein the sleeve is used for accommodating a prefabricated steel bar and a reserved steel bar and enabling the prefabricated steel bar and the reserved steel bar to relatively penetrate into the sleeve; the connecting assembly comprises a steel wire, a top end fixing part, a bottom end fixing part and a drawn wire; at least 4 steel wires are arranged, and the number of the steel wires ranges from 4 to 8; the top end fixing part and the bottom end fixing part are both annular and are used for fixing two ends of the steel wire; the top end fixing part and the bottom end fixing part are coaxially arranged and used as the standard of steel wire installation; the acute angle of an included angle between the steel wire and a longitudinal straight line of a fixed point of the top end fixed part and the bottom end fixed part in a coaxial state is 15-30 degrees, and the steel wire and the fixed points of the top end fixed part and the bottom end fixed part are uniformly distributed at intervals. The grouting process for the longitudinal prefabricated part can effectively improve the structural strength.
Description
Technical Field
The invention relates to the field of prefabricated part construction, in particular to a grouting process for a longitudinal prefabricated part.
Background
The grouting sleeve is also called grouting sleeve joint or sleeve grouting joint.
The grouting sleeve is a combination assembled by a specially processed sleeve, matched grouting materials and reinforcing steel bars, and the reinforcing steel bars and the sleeve are connected by means of the bonding and meshing action between materials through injecting the quick-hardening non-shrinkage grouting materials when the reinforcing steel bars are connected. It is a common structure and method in the construction of longitudinal structures of fabricated buildings, such as walls, columns, etc.
In the prior art, grouting sleeves are commonly constructed in a prefabrication and assembly mode, and after the grouting sleeves are connected with reserved steel bars, grouting materials are fully injected into the residual space in the sleeves through grouting and grout discharging holes in the sleeves.
The existing grouting sleeve basically takes the consideration of design size, specification and the like as the starting point for connecting two sections of longitudinal steel bars which are not in contact with each other by using the strength of the sleeve and the grouting material. Thus, the influence factors are very many, and the sleeve strength, the influence of the sleeve size on the concrete member, the connection size of the sleeve and the steel bar, the grouting material strength and the like. The design aim is to reduce the size of the sleeve as much as possible and improve the connection strength of the reinforcing steel bars. However, the existing grouting sleeve has two problems: 1. the two sections of steel bars are not connected with each other, and bear shear stress by the sleeve and the grouting material, so that the requirements on the strength, the size and the structural design of the sleeve are very strict, and the requirements on the whole size and the strength are high in order to ensure the strength; the requirement on the strength of the grouting material is high. 2. The grouting process is very fine, the influence of the grouting compactness on the overall strength after hardening is very large, but in actual operation, air bubbles are easy to appear at the top of the grouting sleeve and the position with a small structural gap, so that the structural strength is reduced.
Disclosure of Invention
The embodiment of the application solves the technical problem which can be solved by the exclusive right in the prior art by providing the name of the invention, and realizes the technical effect.
A grouting process for longitudinal prefabricated parts includes such steps as arranging the prefabricated reinforcing bars and the reserved reinforcing bars in a sleeve,
the sleeve comprises a grouting pipe, a slurry discharging pipe and a top pipe;
the grouting pipe is positioned at the lower part of the sleeve and used for injecting grouting material into the inner cavity of the sleeve;
the grout outlet pipe is positioned at the upper part of the sleeve and used for overflowing grouting material;
the top pipe is a section of the sleeve between the slurry discharge pipe and the top end of the sleeve,
it is characterized in that the preparation method is characterized in that,
the connecting assembly is used for connecting the prefabricated steel bars and the reserved steel bars;
the connecting assembly comprises a steel wire, a top end fixing part, a bottom end fixing part and a drawn wire;
at least 4 steel wires are arranged, and the number of the steel wires ranges from 4 to 8;
the top end fixing part and the bottom end fixing part are both annular and are used for fixing two ends of the steel wire;
the top end fixing part and the bottom end fixing part are coaxially arranged and used as the standard of steel wire installation;
the acute angle of an included angle between the steel wire and a longitudinal straight line of a fixed point of the top end fixed part and the bottom end fixed part in a coaxial state is 15-30 degrees, and the steel wire and the fixed points of the top end fixed part and the bottom end fixed part are uniformly distributed at intervals;
the inner diameter of a ring formed by the top end fixing part and the bottom end fixing part is 1.1-1.5 times of the diameter of the prefabricated steel bar and the reserved steel bar, so that the steel bar can enter a space surrounded by the steel wires through the top end fixing part 22 and the bottom end fixing part;
the annular belt formed by the top end fixing part and the bottom end fixing part is provided with a gap, one end of the gap is fixed with a pull ring, the other end of the gap is fixed with a wire drawing, and the wire drawing spare end penetrates through the pull ring;
the top end fixing part and the bottom end fixing part are fixed in the middle of the sleeve, so that the axial center of the connecting part is superposed with the axial center of the sleeve;
the top end fixing part is connected with the top end in the sleeve through a tension spring, and the bottom end fixing part is connected with the bottom end in the sleeve through a tension spring;
when the top end fixing part and the bottom end fixing part are fixed on the inner wall of the sleeve, the tension spring is in a stretching state, and the tensile force is smaller than the tensile strength of the fixing point between the connecting part and the sleeve;
the inner diameter of the tension spring is larger than the diameters of the prefabricated steel bar and the reserved steel bar, so that the steel bar can smoothly pass through the tension spring; the lower end of the tension spring at the top end is positioned at the upper side of the pipe orifice of the slurry discharge pipe in a tension state without external force; the top end of the tension spring at the bottom end is positioned at the lower side of the orifice of the grouting pipe in a tension state without external force;
the drawn wire fixed with the top end fixing part extends out of the slurry discharge pipe;
the drawn wires fixed with the bottom end fixing part extend out of the grouting pipe.
Further, coaxial fastening platforms are welded on the prefabricated steel bars and the reserved steel bars, each fastening platform is composed of a plurality of coaxial rings in a circular truncated cone shape, the outer diameter of the top end of each circular truncated cone is gradually reduced, the maximum diameter is 1.3-1.5 times that of the steel bars, and the minimum diameter is 2-3mm larger than the diameter of the steel bars;
the section with the largest diameter of the fastening platform faces to the vacant end of the reinforcing steel bar;
the fastening table can be arranged on the same reinforcing steel bar in a plurality.
Furthermore, there are 6 steel wires, wherein there are four connecting points spaced 90 degrees from the ring of the fixing part, and the diameters of the four steel bars are larger than those of other steel wires.
Further, the grouting assembly comprises a metal sleeve, a grouting sleeve, a hose and an end cover;
the end cover is fixed with the slurry discharge pipe, bears other components and is provided with a slurry discharge port at the top;
the metal pipe is used for permeating into the sleeve, and one end of the metal pipe, which is positioned outside the sleeve, penetrates through the end cover and is provided with a vibration generator;
the drawn wires penetrate out of the metal pipe, and one end of the metal pipe, which is positioned outside the end cover, is provided with a fixing structure such as a hook and the like for fixing the drawn wires;
the grouting sleeve is provided with an elbow, the elbow can penetrate into the sleeve, and the other end of the elbow penetrates through the end cover to extend out; the hose stretches into the sleeve along grout sleeve pipe in, the one end that is located the sleeve of hose can conflict sleeve inner top surface.
The invention has the beneficial effects that:
1. utilize many to be connected with prefabricated reinforcing bar and reserve reinforcing bar with the steel wire through coupling assembling, effectual improvement component continuity improves mechanical strength, is favorable to reducing telescopic design size.
2. The structure is simple, the existing sleeve is convenient to modify, the application range is wide, and the positions with high individual strength requirements and high construction requirements in construction can be conveniently processed;
3. can effectively reduce the requirements on construction requirements and the strength of sleeve materials. The construction difficulty is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view after the fixing points are pulled apart;
FIG. 3 is a schematic view of the elongated and tensioned construction of the connector assembly;
FIG. 4 is a schematic view of the structure during grouting;
FIG. 5 is a schematic view of a connecting assembly;
FIG. 6 is a schematic view of a top end fixing portion of the connecting assembly in an initial state;
FIG. 7 is a schematic view of a joint of a fixing portion according to a second embodiment;
FIG. 8 is a schematic view of the top fixing portion of FIG. 6 closely attached to the reinforcing bars;
fig. 9 is a schematic structural view of the fixing portion of fig. 7 when the fixing portion is tightly attached to the reinforcing bars.
In the figure, a sleeve 10, a grouting pipe 11, a grout discharging pipe 12 and a top pipe 13;
the connecting assembly 20, a steel wire 21, a top end fixing part 22, a bottom end fixing part 23 and a drawn wire 24;
prefabricating a steel bar 30 and a reserved steel bar 40;
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The steel wire is fixed with the spare ends of the prefabricated steel bar 30 and the reserved steel bar 40 through the drawing wires 24, and two sections of unconnected steel bars are connected through the steel wire. The continuity and the strength of the whole structure are improved, the size of the sleeve structure is reduced, and the grouting construction difficulty is reduced.
Example one
As shown in fig. 1-9, a grouting process for longitudinal prefabricated parts, which firstly improves the existing grouting sleeve, includes a sleeve 10, the sleeve 10 is used for accommodating prefabricated steel bars 30 and reserved steel bars 40, so that the prefabricated steel bars 30 and the reserved steel bars 40 relatively penetrate into the sleeve 1,
the sleeve 10 comprises a grouting pipe 11, a slurry discharging pipe 12 and a top pipe 13;
the grouting pipe 11 is positioned at the lower part of the sleeve and used for injecting grouting material into the inner cavity of the sleeve 10;
the slurry discharge pipe 12 is positioned at the upper part of the sleeve and used for overflowing the grouting material;
the top pipe 13 is a section of the sleeve 10 between the slurry discharge pipe 12 and the top end of the sleeve 10;
the prefabricated steel bar connecting structure further comprises a connecting assembly 20, wherein the connecting assembly 20 is used for connecting the prefabricated steel bar 30 and the reserved steel bar 40;
the connecting assembly 20 comprises a steel wire 21, a top end fixing part 22, a bottom end fixing part 23 and a drawn wire 24;
the number of the steel wires 21 is at least 4, the number of the steel wires is 4-8, and the steel wires are selected according to the thickness and the strength of the steel wires and the thickness and the strength of the prefabricated steel bars 30 and the reserved steel bars 40 and according to the requirement of designing the structural strength;
the top end fixing part 22 and the bottom end fixing part 23 are both annular and are used for fixing two ends of the steel wire 21;
the coaxial state of the top end fixing part 22 and the bottom end fixing part 23 is used as the standard for installing the steel wire 21;
the acute angle of an included angle between the steel wire 21 and longitudinal straight lines of fixing points of the top end fixing part 22 and the bottom end fixing part 23 in a coaxial state is 15-30 degrees, and the fixing points of the steel wire 21 and the top end fixing part 22 and the bottom end fixing part 23 are uniformly distributed at intervals;
the inner diameter of a ring formed by the top end fixing part 22 and the bottom end fixing part 23 is 1.1-1.5 times of the diameter of the prefabricated steel bar 30 and the diameter of the reserved steel bar 49, so that the steel bar can easily enter a space surrounded by the steel wires 21 through the top end fixing part 22 and the bottom end fixing part 23;
as shown in fig. 6 and 8, the ring formed by the top end fixing part 22 and the bottom end fixing part 23 is provided with a notch, one end of the notch is fixed with a pull ring 25, the other end of the notch is fixed with a pull wire 24, and the spare end of the pull wire 24 passes through the pull ring 25;
as shown in fig. 7 and 9, the ring formed by the top end fixing portion 22 and the bottom end fixing portion 23 has a gap, the top end fixing portion 22 and the bottom end fixing portion 23 have a plurality of pull rings 25, each of the top end fixing portion 22 and the bottom end fixing portion 23 has one pull ring 25 fixedly connected to the gap, and the remaining pull rings 25 are uniformly spaced from and fixedly connected to the top end fixing portion 22 and the bottom end fixing portion 23;
the top end fixing part 22 and the bottom end fixing part 23 are fixed in the middle of the sleeve in a resin mode, a spot welding mode and the like, so that the axial center of the connecting part 20 is overlapped with the axial center of the sleeve;
the top end fixing part 22 is connected with the inner top end of the sleeve 10 through a tension spring 14, and the bottom end fixing part 23 is connected with the inner bottom end of the sleeve 10 through the tension spring 14;
when the top end fixing part 22 and the bottom end fixing part 23 are fixed on the inner wall of the sleeve 10, the tension spring 14 is in a stretching state, and the tensile strength is smaller than the tensile strength of the fixing point between the connecting part 20 and the sleeve 10;
the inner diameter of the tension spring 14 is larger than the diameters of the prefabricated steel bar 30 and the reserved steel bar 40, so that the steel bars can smoothly pass through the tension spring 14; the tension spring 14 at the top end is in a tension state without external force, and the bottom end is positioned at the upper side of the pipe orifice of the pulp discharge pipe 12; the top end of the tension spring 14 at the bottom end is positioned at the lower side of the orifice of the grouting pipe 11 in a tension state without external force;
the drawing wire 24 fixed with the top end fixing part 22 extends out of the slurry discharge pipe 12;
the string 24 fixed to the bottom end fixing portion 23 extends from the grout pipe 11.
The minimum inner diameter of the space surrounded by the steel wire 21 is preferably larger than the diameter of the steel bar, so that the position and the shape of the steel wire are influenced as much as possible by the steel bar entering the space surrounded by the steel wire, and the tension on the fixing part is not generated, so that the position and the shape of the connecting component 20 are kept stable.
The tension spring 14 is preferably fixed at a single point to the fixing portions at both ends so that the fixing portions are not disturbed by the tension spring when they are deformed.
During the in-service use, prefabricated reinforcing bar 30 inserts earlier in the sleeve 10, after making prefabricated component and the butt joint of reserve reinforcing bar, reserve reinforcing bar 40 inserts in the sleeve 10 from the bottom of sleeve 10, enters into the space in steel wire 21 besieged city behind extension spring 14 and bottom fixed part 23, and is relative with prefabricated reinforcing bar 30. After the position of the steel bar is determined, the drawn wires 24 in the slurry discharge pipe 12 and the slurry injection pipe 11 are pulled outwards, so that the top end fixing part 22 and the bottom end fixing part 23 are separated from the connection of the sleeve 10, and the tension spring 14 pulls the connecting component 20 to move upwards and downwards. Releasing the pull wire 24 allows the tension spring 14 to move the coupling assembly 20 to a free, defined position. Then, the drawing wires 24 are gradually pulled simultaneously, the top end fixing parts and the bottom end fixing parts are deformed when the drawing wires 24 are pulled down, the two ends of the steel wires 21 gradually draw close to the steel bars, and meanwhile, the connecting parts 20 are always kept at the middle positions of the sleeves 10 when the tension springs 14 are pulled down. And continuously loosening the drawn wires 24 until the drawn wires 24 tighten the top end and the bottom end fixing parts to be incapable of deforming, and simultaneously fixing the drawn wires on the steel bars. Then grouting operation is carried out, and the drawn wire 24 is cut short after grouting. The drawn wire may be a steel wire. This results in a stable connection between the precast reinforcing bars 30 and the reserve reinforcing bars 40. And after grouting, the continuity of the structure is stronger, and the structural strength is obviously improved.
By preparing sleeves of the same size: the inner diameter is 43mm, and the outer diameter is 50 mm; the length is 315mm, the diameters of the connecting steel bars are 12mm, 14mm and 16mm, and the anchoring length is 150 mm. Divide into two big groups and test, a set of be prior art group, do not have coupling assembling 20's group promptly, a set of group is experimental group, has contained coupling assembling 20, steel wire diameter 2mm, 4, and the contained angle 18 degrees, the fixed part uses the steel sheet, thickness 1.5mm, width 3mm, 24 steel wires of wire drawing, diameter 1.5 mm. The same grouting materials are used for two groups, and in the grouting process, after the grouting is carried out to the grout discharging pipe 12, the sleeve is vibrated for 30s by using the ultrasonic vibration generator, the grouting is carried out to the grout discharging pipe 12 again, then the sleeve is vibrated for 15s, and the grouting is carried out to the grout discharging pipe 12 again. Tensile testing was performed after curing for 14d under the same conditions. The loading rate was 2MPa/s, the loading was terminated when the bars broke or were pulled out, and the maximum load was recorded, see Table 1.
TABLE 1
It can be seen from the maximum tensile load that the tensile strength of the sleeve as a whole is improved by more than 20% after the connecting assembly is added.
Example two
In addition, in order to improve the connection strength of the steel bars and the steel wires, coaxial fastening platforms 26 are welded on the prefabricated steel bars 30 and the reserved steel bars 40, each fastening platform 26 is composed of a plurality of coaxial rings in a circular truncated cone shape, the outer diameter of the top end of each circular truncated cone is gradually reduced, the maximum diameter is 1.3-1.5 times that of each steel bar, and the minimum diameter is 2-3mm larger than that of each steel bar. The largest diameter section of the platform 26 is directed toward the free end of the bar. The fastening station 26 may be provided in plural on the same reinforcing bar. The fastening station 26 serves to form a fixed flange when the fixing portion is tightened, and to improve the pull-out resistance of the entire structure.
EXAMPLE III
In addition, the steel wires 21 do not need to have the same diameter, and more than 6 steel wires may be provided, but four steel wires may have four connecting points spaced 90 degrees from the ring of the fixing portion, and the four steel wires may have thicker diameter. Like this, can enough guarantee coupling assembling and the intensity of being connected promptly of the flexibility of reinforcing bar connection, can further improve structural strength again.
Example four
In order to make the sleeve vibrate more effectively and the grouting material is more compact, the sleeve fixed in the prefabricated part cannot be vibrated. But with the addition of the joining assembly 20 a more flexible approach is provided. Adding a grouting assembly 50 which comprises a metal sleeve 51, a grouting sleeve 52, a hose 53 and an end cover 54;
the end cover 54 is fixed with the slurry discharge pipe 12, bears other components and is provided with a slurry discharge port at the top;
the metal pipe 51 is used for penetrating into the sleeve 10, and one end of the metal pipe 51, which is positioned outside the sleeve 10, penetrates through the end cover 51 and is provided with a vibration generator;
the drawn wire 24 penetrates out of the metal pipe 51, and one end of the metal pipe 51, which is positioned outside the end cover, is provided with a fixing structure such as a hook and the like for fixing the drawn wire 24;
the grouting sleeve 52 is provided with an elbow which can penetrate into the sleeve 10, and the other end of the elbow penetrates through the end cover 54 to extend out; the flexible pipe 53 extends into the sleeve 10 along the grouting sleeve 52, and one end of the flexible pipe 53 located in the sleeve 10 can abut against the inner top surface of the sleeve 10.
Thus, the grouting process is as follows:
1. the drawn wire in the slurry discharge pipe 12 penetrates out of the metal pipe 51, and the end cover 54 is covered on the metal pipe 51, and then the drawn wire 24 is pulled tightly to enable the metal pipe 51 to abut against the steel bar or the top end fixing part 22;
2. inserting the hose 53 into the sleeve 10 through the grouting sleeve 52, wherein the top end of the hose abuts against the inner top surface of the sleeve 10;
3. grouting to a grout outlet of the end cover 54 through the grouting pipe 11 to discharge grout;
4. starting the vibration generator to drive the metal pipe 51 to vibrate, and further drive the prefabricated steel bar 30, the connecting assembly 20 and the reserved steel bar 40 to vibrate;
5. keeping vibration, applying negative pressure to the hose 53 outside the sleeve 10, sucking air in the top pipe 13, and keeping grouting in the grouting pipe 12 until grouting material is pumped out of the hose;
6. the hose 53 and the grouting sleeve 52 are slowly drawn out, and grouting keeps positive pressure in the process, and vibration is ceaseless;
7. after the hose 53 and the grout sleeve 52 are slowly drawn out, the metal pipe 51 is drawn out, and the vibration is stopped.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A longitudinal prefabricated part grouting process is characterized in that:
provides a grouting sleeve, which comprises a sleeve, wherein the sleeve is used for accommodating prefabricated steel bars and reserved steel bars so that the prefabricated steel bars and the reserved steel bars are relatively deep into the sleeve,
the sleeve comprises a grouting pipe, a slurry discharging pipe and a top pipe;
the grouting pipe is positioned at the lower part of the sleeve and used for injecting grouting material into the inner cavity of the sleeve;
the grout outlet pipe is positioned at the upper part of the sleeve and used for overflowing grouting material;
the top pipe is a section of the sleeve between the slurry discharge pipe and the top end of the sleeve,
it is characterized in that the preparation method is characterized in that,
the connecting assembly is used for connecting the prefabricated steel bars and the reserved steel bars;
the connecting assembly comprises a steel wire, a top end fixing part, a bottom end fixing part and a drawn wire;
at least 4 steel wires are arranged, and the number of the steel wires ranges from 4 to 8;
the top end fixing part and the bottom end fixing part are both annular and are used for fixing two ends of the steel wire;
the top end fixing part and the bottom end fixing part are coaxially arranged and used as the standard of steel wire installation;
the acute angle of an included angle between the steel wire and a longitudinal straight line of a fixed point of the top end fixed part and the bottom end fixed part in a coaxial state is 15-30 degrees, and the steel wire and the fixed points of the top end fixed part and the bottom end fixed part are uniformly distributed at intervals;
the inner diameter of a ring formed by the top end fixing part and the bottom end fixing part is 1.1-1.5 times of the diameter of the prefabricated steel bar and the reserved steel bar, so that the steel bar can enter a space surrounded by the steel wires through the top end fixing part 22 and the bottom end fixing part;
the annular belt formed by the top end fixing part and the bottom end fixing part is provided with a gap, one end of the gap is fixed with a pull ring, the other end of the gap is fixed with a wire drawing, and the wire drawing spare end penetrates through the pull ring;
the top end fixing part and the bottom end fixing part are fixed in the middle of the sleeve, so that the axial center of the connecting part is superposed with the axial center of the sleeve;
the top end fixing part is connected with the top end in the sleeve through a tension spring, and the bottom end fixing part is connected with the bottom end in the sleeve through a tension spring;
when the top end fixing part and the bottom end fixing part are fixed on the inner wall of the sleeve, the tension spring is in a stretching state, and the tensile force is smaller than the tensile strength of the fixing point between the connecting part and the sleeve;
the inner diameter of the tension spring is larger than the diameters of the prefabricated steel bar and the reserved steel bar, so that the steel bar can smoothly pass through the tension spring; the lower end of the tension spring at the top end is positioned at the upper side of the pipe orifice of the slurry discharge pipe in a tension state without external force; the top end of the tension spring at the bottom end is positioned at the lower side of the orifice of the grouting pipe in a tension state without external force;
the drawn wire fixed with the top end fixing part extends out of the slurry discharge pipe;
the drawn wire fixed with the bottom end fixing part extends out of the grouting pipe;
the grouting assembly comprises a metal sleeve, a grouting sleeve, a hose and an end cover;
the end cover is fixed with the slurry discharge pipe, bears other components and is provided with a slurry discharge port at the top;
the metal pipe is used for permeating into the sleeve, and one end of the metal pipe, which is positioned outside the sleeve, penetrates through the end cover and is provided with a vibration generator;
the drawn wires penetrate out of the metal pipe, and one end of the metal pipe, which is positioned outside the end cover, is provided with a fixing structure such as a hook and the like for fixing the drawn wires;
the grouting sleeve is provided with an elbow, the elbow can penetrate into the sleeve, and the other end of the elbow penetrates through the end cover to extend out; the hose extends into the sleeve along the grouting sleeve, and one end of the hose, which is positioned in the sleeve, can abut against the inner top surface of the sleeve;
the grouting process is as follows:
1) the drawn wire in the slurry discharge pipe 12 penetrates out of the metal pipe 51, and the end cover 54 is covered on the metal pipe 51, and then the drawn wire 24 is pulled tightly to enable the metal pipe 51 to abut against the steel bar or the top end fixing part 22;
2) inserting the hose 53 into the sleeve 10 through the grouting sleeve 52, wherein the top end of the hose abuts against the inner top surface of the sleeve 10;
3) grouting to a grout outlet of the end cover 54 through the grouting pipe 11 to discharge grout;
4) starting the vibration generator to drive the metal pipe 51 to vibrate, and further driving the prefabricated steel bar 30, the connecting assembly 20 and the reserved steel bar 40 to vibrate;
5) keeping vibration, applying negative pressure to the hose 53 outside the sleeve 10, sucking air in the top pipe 13, and keeping grouting by the grouting pipe 12 until grouting material is pumped out of the hose;
6) the hose 53 and the grouting sleeve 52 are slowly pumped out, and grouting keeps positive pressure in the process, and vibration is ceaseless;
7) after the hose 53 and the grout sleeve 52 are drawn out, the metal pipe 51 is drawn out and the vibration is stopped.
2. The grouting process of a longitudinal prefabricated part according to claim 1, characterized in that coaxial fastening platforms are welded on the prefabricated steel bars and the reserved steel bars, each fastening platform is composed of a plurality of coaxial rings in a circular truncated cone shape, the outer diameters of the top ends of all the circular truncated cones are gradually reduced, the maximum diameter is 1.3-1.5 times that of the steel bars, and the minimum diameter is 2-3mm larger than the diameter of the steel bars;
the section with the largest diameter of the fastening platform faces to the vacant end of the reinforcing steel bar;
the fastening table can be arranged on the same reinforcing steel bar in a plurality.
3. The grouting process of a longitudinal preform member according to claim 1, wherein there are 6 steel wires, and four of the connection points with the rings of the fixing portion are spaced 90 degrees, and the diameter of the four steel bars is larger than that of the other steel wires.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111827582A (en) * | 2020-07-24 | 2020-10-27 | 江苏建筑职业技术学院 | Grouting sleeve |
| CN112267680A (en) * | 2020-11-05 | 2021-01-26 | 山东省建筑科学研究院有限公司 | Pouring system and method for prefabricated concrete structure |
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