CN114961111A - Corrosion-resistant composite full grouting sleeve and forming process method thereof - Google Patents

Corrosion-resistant composite full grouting sleeve and forming process method thereof Download PDF

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Publication number
CN114961111A
CN114961111A CN202210315872.1A CN202210315872A CN114961111A CN 114961111 A CN114961111 A CN 114961111A CN 202210315872 A CN202210315872 A CN 202210315872A CN 114961111 A CN114961111 A CN 114961111A
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China
Prior art keywords
frp
sleeve
grouting sleeve
ribs
grid
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CN202210315872.1A
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Chinese (zh)
Inventor
陈竞
文建平
丁于强
黄华甫
张倩倩
莫圣杨
韦永丽
严小亮
肖婕
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Liuzhou Ovm Structure Inspection Technology Co ltd
Liuzhou city vocational college
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Liuzhou Ovm Structure Inspection Technology Co ltd
Liuzhou city vocational college
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Application filed by Liuzhou Ovm Structure Inspection Technology Co ltd, Liuzhou city vocational college filed Critical Liuzhou Ovm Structure Inspection Technology Co ltd
Priority to CN202210315872.1A priority Critical patent/CN114961111A/en
Publication of CN114961111A publication Critical patent/CN114961111A/en
Pending legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/04—Methods or machines specially adapted for the production of tubular articles by casting into moulds by simple casting, the material being neither positively compacted nor forcibly fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention relates to a corrosion-resistant composite full grouting sleeve, which is formed by pouring a fiber composite material framework wrapped by ultra-high performance concrete, wherein an FRP (fiber reinforced plastic) separating rod is arranged in an inner cavity of the grouting sleeve, one end of the grouting sleeve is a prefabricated end, the other end of the grouting sleeve is an assembling end, the prefabricated end is provided with a grout outlet pipe joint, the assembling end is provided with a grouting pipe joint, and the inner wall of the grouting sleeve is provided with a spiral convex rib. The fiber reinforced composite material framework comprises FRP ribs, an FRP grid cylinder and FRP separating rods, the FRP ribs are respectively arranged on the inner wall of the FRP grid cylinder in a circumferential mode, and the FRP separating rods are arranged on two FRP ribs on the diagonal line. Grout sleeve inside and outside wall is cement-based material, and it is better with the faying face bonding of concrete, sleeve grout material, has solved prior art no matter have or not rust-resistant coating can all influence sleeve outer wall and concrete to cohere, and the sleeve inner wall corrosion leads to the problem that the anchor efficiency reduces is connected in the grout.

Description

Corrosion-resistant composite full grouting sleeve and forming process method thereof
Technical Field
The invention relates to a grouting sleeve, in particular to a corrosion-resistant composite full-grouting sleeve and a forming process method thereof.
Background
The steel bar sleeve grouting connection is a mainstream steel bar connection mode, is rapidly developed in recent years, and has some problems in scale application: 1. the anticorrosive problem of sleeve itself, no matter be nodular cast iron sleeve or steel sleeve, bury the prefabricated component back prefabrication factory and deposit the in-process, because of rainwater, maintenance water etc. from the sleeve of component terminal surface assemble mouth, grout hole, go out grout hole etc. and flow in the sleeve inner chamber, lead to the problem of the serious corrosion of sleeve inner chamber comparatively general. Sleeve inner chamber corrosion for the sleeve grout material that pours into in the sleeve when assembling bonds with the rust of sleeve inner wall mutually, rather than bonding mutually with the sleeve body, when reinforcing bar atress transmission to the thick liquids after the solidification, thick liquids bonding rust and sleeve body are not hard up to be peeled off, have seriously influenced the power transmission between grout material and sleeve. Common anticorrosive coatings such as spray paint, zinc plating are generally only used for the outer wall of the sleeve, the inner cavity still has no anticorrosive measures, and the anticorrosive coatings can influence the bonding of the sleeve and a concrete structure on the outer wall of the sleeve, can influence the bonding of grouting materials and the sleeve on the inner wall, and can not solve the problem that the grouting connection anchoring efficiency is greatly reduced due to the corrosion of the inner cavity of the sleeve. 2. The sleeve forming process has the problems that the energy consumption for casting the sleeve is high, the environmental pollution is large, and the casting defect is easy to occur; micro cracks are possibly generated in the extrusion process of the steel pipe extrusion forming sleeve, stress concentration is generated at the cracks when the sleeve is stressed, the quality is difficult to guarantee, the elongation rate of the steel pipe is high, the formed grouting sleeve is used for manufacturing a grouting connecting piece, and the qualification rate of residual deformation in type inspection is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a corrosion-resistant composite full grouting sleeve and a forming process method thereof, which aim to solve the problems in the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a corrosion-resistant compound full grout sleeve, grout sleeve includes ultra high performance concrete (hereinafter referred to as UHPC) layer and fibre reinforcement combined material (hereinafter referred to as FRP) casing layer, the FRP casing layer sets up in the UHPC layer, grout sleeve is by UHPC parcel FRP skeleton pouring shaping, grout sleeve's sleeve inner chamber has the FRP spacer bar, grout sleeve one end is prefabricated end, the other end is for assembling the end, prefabricated end is equipped with out the thick liquid coupling, it is equipped with the coupling grout to assemble the end, grout sleeve inner wall is equipped with the spiral fin. The UHPC is the ultra-high performance concrete with the compression strength not lower than 180MPa, the bending tensile strength not lower than 35MPa, the tensile strength not lower than 12MPa and the slump expansion degree not lower than 600 mm.
The further technical scheme of the invention is as follows: the FRP framework comprises FRP ribs, an FRP grid cylinder and FRP separating rods, the FRP ribs are respectively arranged on the inner wall of the FRP grid cylinder in a circumferential mode, and the FRP separating rods are arranged on two FRP ribs on the diagonal line. The FRP ribs are FRP ribs used for enhancing the axial tensile resistance, the FRP grid cylinder is a cylindrical structure FRP grid cylinder formed by enhancing the radial constraint force and assisting in enhancing the axial tensile resistance and is curled, and the FRP separating rod is an FRP separating rod which separates the grouting sleeve into a prefabricated end and an assembled end.
The further technical scheme of the invention is as follows: the FRP ribs and the FRP separating rods are one of basalt fiber ribs, aramid fiber ribs and carbon fiber ribs, the tensile strength of the basalt fiber ribs is not lower than 900MPa, the tensile strength of the aramid fiber ribs is not lower than 1500MPa, and the tensile strength of the carbon fiber ribs is not lower than 2000 MPa.
The further technical scheme of the invention is as follows: the FRP grid is one of basalt fiber grid, aramid fiber grid and carbon fiber grid, the center distance of the meshes is 4 mm-6 mm, the tensile strength of the basalt fiber grid is not lower than 900MPa, the tensile strength of the aramid fiber grid is not lower than 1300MPa, and the tensile strength of the carbon fiber grid is not lower than 1800 MPa.
The further technical scheme of the invention is as follows: a forming method of a corrosion-resistant composite full grouting sleeve comprises the following steps: the method comprises the steps of forming a preformed hole a and a preformed hole b in an FRP grid, forming the FRP ribs, the FRP grid and the FRP separating rods through a framework forming die to obtain an FRP framework, sleeving the FRP framework on the die to perform die filling, pouring by using UHPC, and then demolding to obtain the grouting sleeve.
Molding the FRP framework: inserting the FRP muscle respectively in the locating hole of skeleton moulded die, form FRP net section of thick bamboo around skeleton moulded die round with the FRP net, the FRP net encircles that the overlap joint is cohered fixedly with the gluing agent, the FRP net coheres fixedly with the gluing agent for FRP muscle contact site, the FRP muscle is connected with the FRP net and is constituted FRP skeleton semi-manufactured goods, treat the gluing agent solidification back, with the semi-manufactured goods roll-off of FRP skeleton from the moulded die, cohere the FRP spacer bar on fixing to two diagonal FRP muscle, accomplish the shaping of FRP skeleton. The framework forming die is of a cylinder structure, and a plurality of positioning holes are distributed on the outer side wall of the framework forming die.
And (3) die filling: and sleeving (buckling) the middle sealing gasket on a separation rod of the FRP framework, brushing an internal release agent on the upper core mold and the lower core mold, then respectively sleeving the upper core mold and the lower core mold into the prefabricated end and the assembled end of the FRP framework, respectively propping the upper end and the lower end of the middle sealing plate until the upper core mold and the lower core mold respectively prop against the upper end and the lower end of the middle sealing plate, respectively embedding a grout pipe joint and a grout pipe joint in the preformed holes a and the preformed holes b of the FRP grid, and placing the FRP framework into a forming cavity of an external mold of the grout sleeve.
Pouring: and standing the mixed UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of the top of the outer mold forming cavity of the grouting sleeve until the UHPC slurry overflows from the other side of the top of the forming cavity, and scraping off the redundant UHPC slurry on the end face after the volume is stable.
Demolding: after the pouring is carried out, standing is carried out for 24 hours at the temperature of 10-35 ℃, the outer die is disassembled, the upper core die and the lower core die are separated through the rotation of the inner hexagonal grooves on the end surfaces of the upper core die and the lower core die, and the middle sealing gasket is ejected.
And (3) maintenance of the grouting sleeve: and (3) moving the demolded grouting sleeve into a curing chamber for steam curing, raising the temperature to 80 ℃ at a temperature rise speed of not more than 15 ℃/h, keeping the constant temperature (80 +/-5 ℃) for more than 48h until the cured test block reaches the designed strength under the same condition, and then lowering the temperature to the normal temperature at a temperature drop speed of not more than 15 ℃/h to finish curing.
The upper core die and the lower core die are cylinders with spiral grooves on the surfaces, and the size of the grooves is consistent with that of spiral convex ribs in the inner cavity of the grouting sleeve; the inner hexagonal grooves on the end faces of the upper core mold and the lower core mold are rotated to be separated from the upper core mold and the lower core mold through the inner hexagonal grooves on the end faces of the upper core mold and the lower core mold. The grouting sleeve external mold is formed by two halves of mold closing.
Due to the adoption of the technical scheme, the corrosion-resistant composite full grouting sleeve and the forming process method thereof have the following beneficial effects:
1. the material of the produced full-grouting sleeve body is corrosion-resistant ultra-high-performance concrete and fiber reinforced composite materials, surface rust-proof treatment such as paint spraying is not needed after forming, the inner wall and the outer wall of the grouting sleeve are cement-based materials, bonding with the bonding surface of concrete and sleeve grouting materials is better, and the problems that in the prior art, the outer wall of the sleeve is bonded with the concrete and the grouting connection anchoring efficiency is reduced due to the fact that no rust-proof coating exists or not are solved.
2. The ultra-high performance concrete and the fiber reinforced composite material are both light high-strength materials, the cost of the ultra-high performance concrete per unit volume is only about 4.5 percent of that of nodular cast iron, and about 5 percent of steel, and after the fiber reinforced composite material framework with higher comprehensive cost, the comprehensive cost of the composite grouting sleeve still has greater advantage compared with that of a nodular cast iron sleeve, and has certain cost advantage compared with that of a steel sleeve.
3. The forming process avoids various casting defects possibly generated by casting and the problem of size deviation caused by volume change in the molten iron cooling process, and the problem of size deviation caused by microcracks possibly generated in the steel sleeve extruding process and the steel pipe blank thickness deviation, and has high precision of batch production and stable and reliable quality.
4. The cross section of the spiral convex rib is in a sawtooth shape, and a tooth form angle with reasonable design is matched, so that larger radial component force can be provided when the steel bar sleeve grouting connecting piece is pulled, and the radial constraint performance is better than that of a common isosceles trapezoid and a rectangular thread.
The technical features of the corrosion-resistant composite full grouting sleeve and the forming process thereof according to the present invention will be further described with reference to the drawings and the specific embodiments of the specification.
Drawings
FIGS. 1-1 to 1-3 are schematic views of the overall structure of a corrosion-resistant composite fully-grouted sleeve according to the present invention,
FIG. 1-1: section view of a section A-A of the grouting sleeve, and figures 1-2: grouting sleeve B-B section view, fig. 1-3: C-C section of grouting sleeve.
FIGS. 2-1 to 2-3 are schematic drawings of the blanking process of the corrosion-resistant composite full grouting sleeve forming process of the invention,
FIG. 2-1: FRP rib structure schematic diagram, FIG. 2-2: FRP mesh structure schematic, fig. 2-3: FRP spacer bar structure sketch map.
FIG. 3-1 to 3-6 are schematic diagrams of a skeleton forming mold of the corrosion-resistant composite fully-grouted sleeve forming process method of the invention,
FIG. 3-1: example a skeleton-forming die side view, fig. 3-2: embodiment a skeleton-forming die cross-sectional view;
FIGS. 3-3: example two skeleton forming die side view, fig. 3-4: second embodiment skeleton moulded die cross section;
FIGS. 3 to 5: example three skeleton forming die side view, fig. 3-6: example three skeleton forming die cross-sectional view.
FIGS. 4-1 to 4-2 are schematic views of an FRP framework of the method for forming a corrosion-resistant composite fully-grouted sleeve according to the invention,
FIG. 4-1: side view of FRP skeleton, FIG. 4-2: FRP skeleton cross-sectional view.
FIGS. 5-1 to 5-4 are schematic diagrams of an upper core mold, a lower core mold and a middle sealing gasket of the corrosion-resistant composite full grouting sleeve forming process method of the invention,
FIG. 5-1: upper core side view, fig. 5-2: a top view of the top surface of the upper core mold;
FIGS. 5 to 3: lower core side view, fig. 5-4: and (4) a top view of the bottom surface of the lower core mould.
FIG. 6-1 to FIG. 6-3 are schematic diagrams of the forming mold assembly and the pouring completion of the corrosion-resistant composite full grouting sleeve forming process method of the present invention,
FIG. 6-1: top plan view of the mold assembly, fig. 6-2: assembling a section sectional view of A-A of the forming die; FIGS. 6-3: forming die assembly B-B section profile.
In the above drawings, the respective reference numerals are explained as follows:
1-grouting sleeve, 2-UHPC, 3-FRP framework, 4-FRP partition rod, 5-grout outlet pipe joint, 6-grouting pipe joint, 7-spiral convex rib, 301-FRP rib, 302-FRP grid, a-first preformed hole, b-second preformed hole, m 1-framework forming die, m 101-positioning hole, m 3-upper core die, m 301-upper core die inner hexagonal groove, m 302-spiral groove, m 4-lower core die, m 401-lower core die inner hexagonal groove, m 2-middle sealing gasket, m 5-grouting sleeve outer die and m 6-end cover.
Detailed Description
A corrosion-resistant composite full grouting sleeve is characterized in that a grouting sleeve 1 is formed by pouring Ultra-High Performance Concrete 2 (UHPC for short) wrapping a Fiber Reinforced Polymer (FRP) framework 3, an FRP separating rod 4 is arranged in an inner cavity of the grouting sleeve and divides the grouting sleeve into a prefabricated end and an assembled end, a grout outlet pipe joint 5 is arranged at the position, close to the end face, of the prefabricated end, a grout inlet pipe joint 6 is arranged at the position, away from the end face, of the assembled end at a certain distance, and spiral ribs 7 are arranged on the inner wall of the grouting sleeve. The FRP framework 3 is formed by bonding FRP ribs 301 for enhancing axial tensile resistance, FRP grids 302 for enhancing radial constraint force and assisting in enhancing axial tensile resistance and FRP separating rods 4 for separating the grouting sleeve into a prefabricated end and an assembling end. The FRP ribs are distributed on the inner wall of the FRP grid cylinder in a circumferential mode, and the FRP separating rods are arranged on the two FRP ribs on the diagonal line. The grouting sleeve comprises an ultrahigh-performance concrete layer and a fiber reinforced composite material framework layer, wherein the fiber reinforced composite material framework layer is arranged in the ultrahigh-performance concrete layer.
The basic steps of the forming process method of the corrosion-resistant composite full grouting sleeve comprise:
A. blanking: selecting the types and the models of the FRP ribs 301, the FRP grids 302 and the FRP separating rods 4 and the number x of the FRP ribs required by the framework according to the breaking tension of the steel bars matched with the grouting sleeve; determining the length L of the FRP rib according to the length L of the grouting sleeve 1 J And the length L of the FRP mesh W， L J =L W = L; calculating the outer diameter D of the FRP grid 302 according to the outer diameter D of the grouting sleeve 1 W The distance between the outer surface of the grouting sleeve 1 and the outer surface of the FRP grid 302 is m and D W = D-2M, width M of FRP grid 302 W Equal to the perimeter C of the FRP grid 302 W Plus a lap length n, i.e. M W =πD W And + n = pi (D-2 m)/2 + n, and the FRP ribs 301, the FRP grids 302 and the FRP separating rods 4 are blanked for standby according to the determined size.
B, molding the FRP framework: inserting x (x =4 or 6 or 8) FRP ribs 301 which are well blanked into positioning holes m101 of a framework forming mold m1 respectively, bonding and fixing the FRP grid 302 around the framework forming mold m1 for one circle and around the lap joint length n by using an adhesive to form an FRP grid cylinder, bonding and fixing the contact part of the FRP grid 302 and the FRP ribs 301 by using the adhesive, forming a preformed hole a and a preformed hole b on the FRP grid 302, sliding a semi-finished product of the FRP framework 3 out of the forming mold m1 after the adhesive is cured, bonding and fixing the FRP separating rod 4 on two diagonal FRP ribs 301, and completing the forming of the FRP framework 3. The framework forming die is of a cylinder structure, and a plurality of positioning holes are distributed on the outer side wall of the framework forming die. And selecting the framework forming die corresponding to the positioning holes according to the quantity x of the FRP ribs.
C. Die filling: and buckling the middle sealing gasket m2 on the spacer bar 4 of the FRP framework, respectively sleeving the core mold into the FRP framework 3, namely brushing an internal release agent on the upper core mold m3 and the lower core mold m4, respectively sleeving the prefabricated end and the assembly end of the FRP framework 3, and respectively propping against the upper end and the lower end of the middle sealing plate m 2. The above assembly is put into a molding cavity of a grouting sleeve external mold m5 brushed with an external release agent, a grout outlet pipe joint 5 and a grouting pipe joint 6 are respectively embedded in the preformed hole a and the preformed hole b of the FRP grid 302, and the grouting sleeve external mold m5 is closed.
D. Pouring: and stirring UHPC according to the use specification, standing the stirred UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of a forming cavity opening at the top of the outer die m5 of the grouting sleeve until the UHPC slurry overflows from the other side of the forming cavity opening, scraping the redundant UHPC slurry on the end surface after the volume is stable, covering an end cover m6, and keeping the end surface flat and the UHPC slurry wet by using an end cover m 6.
E. Demolding: after pouring, standing for 24h at the temperature of 10-35 ℃, removing the outer die m5 of the grouting sleeve, rotationally removing the upper core die and the lower core die through the inner hexagonal grooves on the end surfaces of the upper core die m3 and the lower core die m4, and ejecting the middle sealing gasket m 2.
F. And (5) maintenance: and (3) moving the demolded grouting sleeve 1 into a curing chamber for steam curing, raising the temperature to 80 ℃ at a temperature rise speed of 12 ℃/h-15 ℃/h, keeping the temperature constant (80 +/-5 ℃) for more than 48h until the test block is cured under the same conditions until the design strength is reached, and then lowering the temperature to the normal temperature at a temperature drop speed of 12 ℃/h-15 ℃/h to finish curing.
The UHPC is the ultra-high performance concrete with the compression strength not lower than 180MPa, the bending tensile strength not lower than 35MPa, the tensile strength not lower than 12MPa and the slump expansion degree not lower than 600 mm.
The FRP ribs 301 and the FRP separating rods 4 are all one of basalt fiber ribs, aramid fiber ribs and carbon fiber ribs, the tensile strength of the basalt fiber ribs is not lower than 900MPa, the tensile strength of the aramid fiber ribs is not lower than 1500MPa, and the tensile strength of the carbon fiber ribs is not lower than 2000 MPa.
The FRP grid 302 is one of a basalt fiber grid, an aramid fiber grid and a carbon fiber grid, the center distance of the meshes is 4 mm-6 mm, the tensile strength of the basalt fiber grid is not lower than 900MPa, the tensile strength of the aramid fiber grid is not lower than 1300MPa, and the tensile strength of the carbon fiber grid is not lower than 1800 MPa.
The cross section of the spiral convex rib 7 is in a sawtooth shape, the tooth form angle is 45-60 degrees, the tooth height is 2-5 mm, the tooth crest width is 2-5 mm, the spiral lead angle is 12-17 degrees, and the screw pitch is 30-60 mm.
The adhesive is one of a quick-setting epoxy resin adhesive and an organic silicon adhesive.
The middle sealing gasket m2 is an elastomer and is made of one of rubber, polyurethane, polyamide and styrene. The middle sealing gasket is of a circular plate structure, the middle of the circular plate is provided with a groove opposite to the FRP separating rod, the middle sealing gasket is of an elastic structure, when the middle sealing gasket is buckled on the FRP separating rod, the opening part of the deformed groove of the middle sealing gasket is jacked open, the FRP separating rod can be embedded, the state of the middle sealing gasket is restored after the FRP separating rod is embedded, the middle sealing gasket is clamped on the FRP separating rod, and the middle sealing gasket can be jacked away in the direction.
The upper core die m3 and the lower core die m4 are cylinders with spiral grooves on the surfaces, the size of the grooves is consistent with that of spiral ribs 7 of the inner cavity of the grouting sleeve 1, and the upper core die m3 and the lower core die m4 are made of one of cold-work grinding tool steel grades with high wear resistance, such as Crl2, Crl2MoV, Cr6WV, Cr4W2MoV, Cr2Mn2SiWMoV and the like. The outer diameter of the core mold is smaller than the inner diameter of the FRP grid cylinder, and the distance from the outer surface of the core mold to the inner surface of the FRP grid cylinder is 0.5-4 mm.
The grouting sleeve external mold m5 is formed by two half mold closing modes, the mold closing mode can be bolt connection or buckle connection, and the material of the grouting sleeve external mold is one of general low alloy tool steel grades such as Mn2V, 9SiCr, 9CrWMl3, CrWMn, Cr2 and the like. The diameter of the outer mold cavity of the grouting sleeve is larger than the outer diameter of the FRP grid cylinder. The distance from the inner surface of the outer mold of the grouting sleeve to the outer surface of the core mold is the wall thickness of the grouting sleeve. The wall thickness of the grouting sleeve is 4-12 mm.
The internal mold release agent and the external mold release agent are both water-based concrete mold release agents, the grout outlet pipe joint 5 and the grout inlet pipe joint 6 are conventional water pipe joints, the material is one of PVC or PPR, and the internal mold release agent and the external mold release agent are common known products in the market.
The first embodiment is as follows: the basic steps of the forming process method of the corrosion-resistant composite full grouting sleeve comprise:
A. blanking: selecting the types and the types of the FRP ribs 301, the FRP grids 302 and the FRP separating rods 4 and the number x of the FRP ribs required by the framework according to the breaking tension of the steel bars matched with the grouting sleeves; determining the length L of the FRP rib according to the length L of the grouting sleeve 1 J And the length L of the FRP mesh W， L J =L W =L(ii) a Calculating the outer diameter D of the FRP grid 302 according to the outer diameter D of the grouting sleeve 1 W The distance between the outer surface of the grouting sleeve 1 and the outer surface of the FRP grid 302 is m and D W = D-2M, width M of FRP mesh 302 W Equal to the perimeter C of the FRP grid 302 W Plus a lap length n, i.e. M W =πD W And + n = pi (D-2 m)/2 + n, and the FRP ribs 301, the FRP grids 302 and the FRP partition rods 4 are blanked for standby according to the determined size.
B, molding the FRP framework: inserting 4 FRP muscle 301 that the unloading is good into skeleton moulded die m 1's locating hole m101 respectively, with FRP net 302 around skeleton moulded die m1 round, it is fixed to bond with the gluing agent around overlap length n, FRP net 302 bonds with FRP muscle 301 contact site and fixes with the gluing agent, open preformed hole an and preformed hole b on FRP net 302, after the gluing agent solidification, with the semi-manufactured goods of FRP skeleton 3 roll off from moulded die m1, bond FRP spacer 4 and fix to two diagonal FRP muscle 301, accomplish the shaping of FRP skeleton 3.
C. Die filling: and buckling the middle sealing gasket m2 on the separating rod 4 of the FRP framework, brushing an internal release agent on the upper core mold m3 and the lower core mold m4, then respectively sleeving the prefabricated end and the assembled end of the FRP framework 3, and respectively propping against the upper end and the lower end of the middle sealing plate m 2. The above assembly is put into a molding cavity of a grouting sleeve external mold m5 brushed with an external release agent, a grout outlet pipe joint 5 and a grouting pipe joint 6 are respectively embedded in the preformed hole a and the preformed hole b of the FRP grid 302, and the grouting sleeve external mold m5 is closed.
D. Pouring: and stirring UHPC according to the use specification, standing the stirred UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of the forming cavity opening at the top of an outer die m5 of the grouting sleeve until the UHPC slurry overflows from the other side of the forming cavity opening, scraping redundant UHPC slurry on the end face after the volume is stable, covering an end cover m6, and keeping the end face flat and the UHPC slurry wet by using an end cover m 6.
E. Demolding: after pouring, standing for 24h at the temperature of 20 ℃, removing the outer mold m5 of the grouting sleeve, rotationally removing the upper core mold and the lower core mold through the inner hexagonal grooves on the end surfaces of the upper core mold m3 and the lower core mold m4, and ejecting the middle sealing gasket m 2.
F. And (5) maintenance: and (3) moving the demolded grouting sleeve 1 into a curing chamber for steam curing, raising the temperature to 80 ℃ at a temperature rise speed of 15 ℃/h, keeping the constant temperature (80 +/-5 ℃) for more than 48h until the cured test block reaches the designed strength under the same condition, and then lowering the temperature to the normal temperature at a temperature drop speed of 15 ℃/h to finish curing.
The FRP ribs 301 and the FRP separating rods 4 are carbon fiber ribs with the diameter of 3mm and the tensile strength of 2400 MPa. The FRP grid 302 is a carbon fiber grid with the mesh center distance of 5mm and the tensile strength of 1800 MPa. The adhesive is a quick-setting epoxy resin adhesive.
The cross section of the spiral convex rib 7 is in a sawtooth shape, the tooth form angle is 60 degrees, the tooth height is 2mm, the tooth top width is 2mm, the spiral lead angle is 12 degrees, and the thread pitch is 30 mm.
The middle sealing gasket m2 is made of elastomer and rubber. The upper core die m3 and the lower core die m4 are cylinders with spiral grooves on the surfaces, the size of the grooves is consistent with that of the spiral convex ribs 7 of the inner cavity of the grouting sleeve 1, and the material is Crl 2. The grouting sleeve outer mold m5 is formed by two halves of mold closing, the mold closing mode can be bolt connection, and the material is Mn 2V. The internal release agent and the external release agent are both water-based concrete release agents, and the grout outlet pipe joint 5 and the grout inlet pipe joint 6 are conventional water pipe joints and are made of PVC.
Example two: the basic steps of the forming process method of the corrosion-resistant composite full grouting sleeve comprise:
A. blanking: selecting the types and the types of the FRP ribs 301, the FRP grids 302 and the FRP separating rods 4 and the number x of the FRP ribs required by the framework according to the breaking tension of the steel bars matched with the grouting sleeves; determining the length L of the FRP rib according to the length L of the grouting sleeve 1 J And the length L of the FRP mesh W， L J =L W = L; calculating the outer diameter D of the FRP grid 302 according to the outer diameter D of the grouting sleeve 1 W The distance between the outer surface of the grouting sleeve 1 and the outer surface of the FRP grid 302 is m and D W = D-2M, width M of FRP mesh 302 W Equal to the perimeter C of the FRP grid 302 W Plus the overlap length n, i.e. M W =πD W And + n = pi (D-2 m)/2 + n, and the FRP ribs 301, the FRP grids 302 and the FRP partition rods 4 are blanked for standby according to the determined size.
B, molding the FRP framework: inserting 6 FRP muscle 301 that the unloading is good into skeleton moulded die m 1's locating hole m101 respectively, with FRP net 302 around skeleton moulded die m1 round, it is fixed to bond with the gluing agent around overlap length n, FRP net 302 bonds with FRP muscle 301 contact site and fixes with the gluing agent, open preformed hole an and preformed hole b on FRP net 302, after the gluing agent solidification, with the semi-manufactured goods of FRP skeleton roll-off from moulded die m1, bond FRP spacer 4 and fix to two diagonal FRP muscle 301 on, accomplish the shaping of FRP skeleton 3.
C. Die filling: and buckling the middle sealing gasket m2 on the separating rod 4 of the FRP framework, brushing an internal release agent on the upper core mold m3 and the lower core mold m4, then respectively sleeving the prefabricated end and the assembled end of the FRP framework 3, and respectively propping against the upper end and the lower end of the middle sealing plate m 2. The above assembly is put into a molding cavity of a grouting sleeve external mold m5 brushed with an external release agent, a grout outlet pipe joint 5 and a grouting pipe joint 6 are respectively embedded in the preformed hole a and the preformed hole b of the FRP grid 302, and the grouting sleeve external mold m5 is closed.
D. Pouring: and stirring UHPC according to the use specification, standing the stirred UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of a forming cavity opening at the top of the outer die m5 of the grouting sleeve until the UHPC slurry overflows from the other side of the forming cavity opening, scraping the redundant UHPC slurry on the end surface after the volume is stable, covering an end cover m6, and keeping the end surface flat and the UHPC slurry wet by using an end cover m 6.
E. Demolding: after pouring, standing for 24h in an environment of 15 ℃, removing the outer mold m5 of the grouting sleeve, separating the upper core mold and the lower core mold by rotating the inner hexagonal grooves on the end surfaces of the upper core mold m3 and the lower core mold m4, and ejecting the middle sealing gasket m 2.
F. And (5) maintenance: and (3) moving the demolded grouting sleeve 1 into a curing chamber for steam curing, raising the temperature to 80 ℃ at a heating rate of 13 ℃/h, keeping the constant temperature (80 +/-5 ℃) for more than 48h until the cured test block reaches the designed strength under the same condition, and then lowering the temperature to the normal temperature at a cooling rate of 13 ℃/h to finish curing.
The FRP ribs 301 and the FRP separating rods 4 are basalt fiber ribs with the diameter of 4mm and the tensile strength of 1000 MPa. The FRP grid 302 is a basalt fiber grid with mesh center distance of 6mm and tensile strength of 900 MPa. The cross section of the spiral convex rib 7 is in a sawtooth shape, the tooth form angle is 60 degrees, the tooth height is 3mm, the tooth top width is 3mm, the spiral lead angle is 15 degrees, and the thread pitch is 40 mm. The adhesive is a quick-setting epoxy resin adhesive.
The middle sealing gasket m2 is made of elastomer and is made of polyurethane. The upper core die m3 and the lower core die m4 are cylinders with spiral grooves on the surfaces, the size of the grooves is consistent with that of the spiral convex ribs 7 of the inner cavity of the grouting sleeve 1, and the grooves are made of Crl2 MoV. The grouting sleeve outer mold m5 is formed by two halves of mold closing, the mold closing mode can be bolt connection, and the material is 9 SiCr. The internal release agent and the external release agent are both water-based concrete release agents, and the grout outlet pipe joint 5 and the grout inlet pipe joint 6 are conventional water pipe joints and are made of PVC.
Example three: the basic steps of the forming process method of the corrosion-resistant composite full grouting sleeve comprise:
A. blanking: selecting the types and the types of the FRP ribs 301, the FRP grids 302 and the FRP separating rods 4 and the number x of the FRP ribs required by the framework according to the breaking tension of the steel bars matched with the grouting sleeves; determining the length L of the FRP rib according to the length L of the grouting sleeve 1 J And the length L of the FRP mesh W， L J =L W = L; calculating the outer diameter D of the FRP grid 302 according to the outer diameter D of the grouting sleeve 1 W The distance between the outer surface of the grouting sleeve 1 and the outer surface of the FRP grid 302 is m and D W = D-2M, width M of FRP mesh 302 W Equal to the perimeter C of the FRP grid 302 W Plus a lap length n, i.e. M W =πD W And + n = pi (D-2 m)/2 + n, and the FRP ribs 301, the FRP grids 302 and the FRP partition rods 4 are blanked for standby according to the determined size.
B, molding the FRP framework: 8 FRP muscle 301 that the unloading is good are inserted respectively in the locating hole m101 of skeleton moulded die m1, with FRP net 302 around skeleton moulded die m1 round, it is fixed to bond with the gluing agent around overlap length n, FRP net 302 bonds with FRP muscle 301 contact site and fixes with the gluing agent, open preformed hole an and preformed hole b on FRP net 302, after the gluing agent solidification, with the semi-manufactured goods of FRP skeleton 3 roll off from moulded die m1, bond FRP spacer 4 and fix to two diagonal FRP muscle 301, accomplish the shaping of FRP skeleton 3.
C. Die filling: and buckling the middle sealing gasket m2 on the separating rod 4 of the FRP framework, brushing an internal release agent on the upper core mold m3 and the lower core mold m4, then respectively sleeving the prefabricated end and the assembled end of the FRP framework 3, and respectively propping against the upper end and the lower end of the middle sealing plate m 2. The above assembly is put into a molding cavity of a grouting sleeve external mold m5 brushed with an external release agent, a grout outlet pipe joint 5 and a grouting pipe joint 6 are respectively embedded in the preformed hole a and the preformed hole b of the FRP grid 302, and the grouting sleeve external mold m5 is closed.
D. Pouring: and stirring UHPC according to the use specification, standing the stirred UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of a forming cavity opening at the top of the outer die m5 of the grouting sleeve until the UHPC slurry overflows from the other side of the forming cavity opening, scraping the redundant UHPC slurry on the end surface after the volume is stable, covering an end cover m6, and keeping the end surface flat and the UHPC slurry wet by using an end cover m 6.
E. Demolding: after pouring, standing for 24h in an environment of 30 ℃, removing the outer mold m5 of the grouting sleeve, separating the upper core mold and the lower core mold through the rotation of the inner hexagonal grooves on the end surfaces of the upper core mold m3 and the lower core mold m4, and ejecting the middle sealing gasket m 2.
F. And (5) maintenance: and (3) moving the demolded grouting sleeve 1 into a curing chamber for steam curing, raising the temperature to 80 ℃ at a temperature rise speed of 12 ℃/h, keeping the constant temperature (80 +/-5 ℃) for more than 48h until the cured test block reaches the designed strength under the same condition, and then lowering the temperature to the normal temperature at a temperature drop speed of 12 ℃/h to finish curing.
The FRP ribs 301 and the FRP separating rods 4 are aramid fiber ribs with the diameter of 5mm and the tensile strength of 1500 MPa. The FRP grid 302 is an aramid fiber grid with the mesh center distance of 4mm and the tensile strength of 1300 MPa. The cross section of the spiral convex rib 7 is in a sawtooth shape, the tooth form angle is 45, the tooth height is 5mm, the tooth top width is 5mm, the spiral lead angle is 117 degrees, and the thread pitch is 60 mm. The adhesive is a quick-setting type organic silicon adhesive.
The middle sealing gasket m2 is an elastomer and is made of styrene; the upper core die m3 and the lower core die m4 are cylinders with spiral grooves on the surfaces, the size of the grooves is consistent with that of the spiral ribs 7 in the inner cavity of the grouting sleeve 1, and the material is Cr6 WV. The grouting sleeve outer mold m5 is formed by two half mold closing modes, the mold closing modes are in snap connection, and the material is Cr 2. The internal release agent and the external release agent are both water-based concrete release agents, and the grout outlet pipe joint 5 and the grout inlet pipe joint 6 are conventional water pipe joints and are made of PPR.

Claims (10)

1. The utility model provides a corrosion-resistant compound sleeve that is in full grout which characterized in that: the grouting sleeve is formed by pouring an FRP framework wrapped by UHPC, an FRP partition rod is arranged in a sleeve inner cavity of the grouting sleeve, one end of the grouting sleeve is a prefabricated end, the other end of the grouting sleeve is an assembled end, a grout outlet pipe joint is arranged at the prefabricated end, a grouting pipe joint is arranged at the assembled end, and a spiral convex rib is arranged on the inner wall of the grouting sleeve; the FRP framework comprises FRP ribs, an FRP grid cylinder and FRP separating rods, the FRP ribs are distributed on the inner wall of the FRP grid cylinder in a circumferential mode, and the FRP separating rods are arranged on two FRP ribs on the diagonal line.
2. The corrosion-resistant composite fully grouted sleeve of claim 1, wherein: the UHPC is the ultra-high performance concrete with the compression strength not lower than 180MPa, the bending tensile strength not lower than 35MPa, the tensile strength not lower than 12MPa and the slump expansion degree not lower than 600 mm.
3. The corrosion-resistant composite fully grouted sleeve of claim 1, wherein: the FRP ribs and the FRP separating rods are one of basalt fiber ribs, aramid fiber ribs and carbon fiber ribs, the tensile strength of the basalt fiber ribs is not lower than 900MPa, the tensile strength of the aramid fiber ribs is not lower than 1500MPa, and the tensile strength of the carbon fiber ribs is not lower than 2000 MPa.
4. The corrosion-resistant composite full grout sleeve according to claim 1, wherein: the FRP grid is one of basalt fiber grid, aramid fiber grid and carbon fiber grid, the center distance of the meshes is 4 mm-6 mm, the tensile strength of the basalt fiber grid is not lower than 900MPa, the tensile strength of the aramid fiber grid is not lower than 1300MPa, and the tensile strength of the carbon fiber grid is not lower than 1800 MPa.
5. A forming method of a corrosion-resistant composite full grouting sleeve is characterized by comprising the following steps: the method comprises the following steps: the method comprises the steps of forming a preformed hole a and a preformed hole b in an FRP grid, forming the FRP rib, the FRP grid and the FRP separating rod through a framework forming die to obtain an FRP framework, sleeving the FRP framework on a die to perform die filling, pouring ultrahigh-performance concrete, and then demolding to obtain the grouting sleeve.
6. The method for forming the corrosion-resistant composite full grouting sleeve according to claim 5, wherein the method comprises the following steps: molding the FRP framework: the FRP ribs are respectively inserted into the positioning holes of the framework forming die, the FRP grid is wound around the framework forming die for a circle to form an FRP grid cylinder, the contact part of the FRP grid and the FRP ribs is fixedly connected, the FRP ribs and the FRP grid are connected to form a semi-finished product of the FRP framework, the semi-finished product of the FRP framework slides out of the forming die, the FRP separating rod is fixed onto two diagonal FRP ribs, and the forming of the FRP framework is completed.
7. The method for forming the corrosion-resistant composite full grouting sleeve according to claim 5, wherein the method comprises the following steps: and (3) die filling: sleeving a middle sealing gasket on a separation rod of an FRP framework, respectively sleeving an upper core mould and a lower core mould into a prefabricated end and an assembled end of the FRP framework until the upper core mould and the lower core mould respectively prop against the upper end and the lower end of a middle sealing plate, respectively embedding a grout outlet pipe joint and a grout pipe joint in a reserved hole a and a reserved hole b of an FRP grid, and installing the FRP framework into a forming cavity of an outer mould of a grouting sleeve; the upper core mold and the lower core mold are cylinders with spiral grooves on the surfaces, and the size of the grooves is consistent with that of spiral convex ribs in the inner cavity of the grouting sleeve; the grouting sleeve external mold is formed by two halves of mold closing.
8. The method for forming the corrosion-resistant composite full grouting sleeve according to claim 5, wherein the method comprises the following steps: pouring: and standing the mixed UHPC slurry for 2-3 minutes, pouring the UHPC slurry into a forming cavity from one side of the top of the outer mold forming cavity of the grouting sleeve until the UHPC slurry overflows from the other side of the top of the forming cavity, and scraping redundant UHPC slurry on the end face after the volume is stable.
9. The forming method of the corrosion-resistant composite full grouting sleeve of claim 5, wherein: demolding: and standing for 24 hours at the temperature of 10-35 ℃ after pouring, removing the outer die, removing the upper core die and the lower core die, and ejecting the middle sealing gasket.
10. The method for forming the corrosion-resistant composite full grouting sleeve according to claim 5, wherein the method comprises the following steps: and (3) maintenance of the grouting sleeve: and (3) moving the demolded grouting sleeve into a curing chamber for steam curing, raising the temperature to 80 ℃ at a temperature rise speed of not more than 15 ℃/h, keeping the constant temperature for more than 48h, and then lowering the temperature to the normal temperature at a temperature drop speed of not more than 15 ℃/h to finish the curing.
CN202210315872.1A 2022-03-28 2022-03-28 Corrosion-resistant composite full grouting sleeve and forming process method thereof Pending CN114961111A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8324374D0 (en) * 1982-09-11 1983-10-12 Hope P F Reinforcing bar coupling system
KR20060110610A (en) * 2005-04-21 2006-10-25 현대제철 주식회사 Connecting structure of steel reinforcing and connecting method of steel reinforcing
CN105625641A (en) * 2016-02-16 2016-06-01 沈阳建筑大学 FRP (fiber reinforced polymer) grouting sleeve for connecting reinforced steel bars
CN106812258A (en) * 2016-12-29 2017-06-09 合肥工业大学 A kind of full grout sleeves of GFRP
CN109098355A (en) * 2018-08-30 2018-12-28 宁波联城住工科技有限公司 Grout sleeve and its installation method
CN109838041A (en) * 2019-03-13 2019-06-04 北京工业大学 A kind of FRP fiber crossovers winding taper grout sleeve and its apply method
CN209891561U (en) * 2019-01-11 2020-01-03 东南大学 Composite bar connector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8324374D0 (en) * 1982-09-11 1983-10-12 Hope P F Reinforcing bar coupling system
KR20060110610A (en) * 2005-04-21 2006-10-25 현대제철 주식회사 Connecting structure of steel reinforcing and connecting method of steel reinforcing
CN105625641A (en) * 2016-02-16 2016-06-01 沈阳建筑大学 FRP (fiber reinforced polymer) grouting sleeve for connecting reinforced steel bars
CN106812258A (en) * 2016-12-29 2017-06-09 合肥工业大学 A kind of full grout sleeves of GFRP
CN109098355A (en) * 2018-08-30 2018-12-28 宁波联城住工科技有限公司 Grout sleeve and its installation method
CN209891561U (en) * 2019-01-11 2020-01-03 东南大学 Composite bar connector
CN109838041A (en) * 2019-03-13 2019-06-04 北京工业大学 A kind of FRP fiber crossovers winding taper grout sleeve and its apply method

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