CN111851323B - Construction process for manufacturing concrete joint structure - Google Patents
Construction process for manufacturing concrete joint structure Download PDFInfo
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- CN111851323B CN111851323B CN202010648950.0A CN202010648950A CN111851323B CN 111851323 B CN111851323 B CN 111851323B CN 202010648950 A CN202010648950 A CN 202010648950A CN 111851323 B CN111851323 B CN 111851323B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/262—Concrete reinforced with steel fibres
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The embodiment of the invention discloses a novel concrete joint structure which comprises a first component, a second component, a pre-embedded connecting device, a pre-coating layer, epoxy mortar, steel fibers and a prefabricated groove, wherein the first component is a hollow structure; the first component and the second component have the same cross-sectional dimension, the prefabricated groove is formed on the joint surface of the first component and the second component, the steel fibers are mixed in the first component and the second component and have parts exposing the joint surface, the precoat layer is coated on the joint surface, and the joint surfaces of the first component and the second component are mutually bonded through the epoxy mortar. The embodiment of the invention also discloses a process for manufacturing the novel concrete joint structure. By adopting the invention, the condition of the concrete joint surface is effectively improved, the surface of the concrete joint surface has better cohesiveness with the epoxy mortar, the mechanical properties such as crack resistance, bending resistance, shear resistance and the like and the durability of the joint of the concrete member are effectively improved, and the structure has better overall performance and longer service life.
Description
Technical Field
The invention relates to the field of bridge engineering, structural engineering and structural reinforcement, in particular to a novel concrete joint structure and a construction process.
Background
In recent years, with the development of economy in China, the country pays more and more attention to the research, development and popularization of prefabricated assembled structures, combined structures and reinforcement processes, and experts, scholars and enterprises at home and abroad jointly research, develop and design various assembled combined structures and reinforcement processes, so that the achievement is quite rich and the market is gradually formed. Like steel materials forming structures by welding, bolting, etc., prefabricated components and combined components are integrated by mutual joints, and a large number of cracks existing in a reinforcement project need to be repaired, and the mechanical properties and the seam quality of the joints or cracks and the waterproof type play an important role in the safety of the structures.
During the operation of the structure, the joint is one of the most vulnerable sites of precast concrete, composite structures, and reinforced structures. The structural member or the structural member to be repaired is integrated or repaired through the seam, and the structural member or the structural member to be repaired jointly bears various loads on the upper part through the seam. The joint is used as a main component of a prefabricated assembly type structure, a combined structure and a reinforced structure, and plays a role in coordinating the joint work of all parts of the structure under the reciprocating load effect, and the service life of the joint greatly affects the normal operation of the bridge. From the current situation of the structure which is put into operation at present, the joints have a lot of problems, the joints of most structures work with defects, the durability of the joints of the bridge is reduced, and the joints are damaged under the action of complex load on the upper part, so that the safety of the bridge is seriously affected.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a novel concrete joint structure and a construction process. The bonding performance between concrete members can be effectively improved, the stress performance of a joint can be improved, and a concrete combined structure or a reinforced structure has better bending resistance, crack resistance and other performances, so that the safety of the lives and properties of the nation is guaranteed; the invention also has the characteristics of better waterproof performance, detachability and recovery, can improve the durability of the structure in the operation stage, and saves the cost and the construction time.
In order to solve the technical problems, the embodiment of the invention provides a novel concrete joint structure which comprises a first component, a second component, a pre-embedded connecting device, a pre-coating layer, epoxy mortar, steel fibers and a prefabricated groove, wherein the first component is a steel wire; the pre-embedded connecting device is pre-embedded in the first component and the second component and provided with parts exposing the surfaces of the first component and the second component, the prefabricated groove is formed in the joint surfaces of the first component and the second component, the steel fibers are mixed in the first component and the second component and provided with parts exposing the joint surfaces, the pre-coating layer is coated on the joint surfaces, and the joint surfaces of the first component and the second component are mutually bonded through the epoxy mortar.
Further, still include stretch-draw positioner, backing plate, anchor, force sensor, stretch-draw reinforcing bar, stretch-draw positioner arranges in pre-buried connecting device's lateral surface, stretch-draw reinforcing bar wears to locate respectively on component one, the component two stretch-draw positioner to the cover is equipped with on its both ends backing plate, force sensor, anchor.
Furthermore, the thickness limiting device is arranged on the joint surface of the first component and/or the second component.
Further, the section of the thickness limiting device is 1/200 of the joint surface, and the height of the thickness limiting device is 1 cm.
Further, the diameter of the steel fiber is 0.1mm, the length of the steel fiber is 2cm, and the exposed length of the steel fiber is larger than 10 mm.
Further, the depth of the prefabricated groove is 2cm, and the area of the prefabricated groove is 9cm2。
The waterproof structure further comprises a water stop strip arranged at the edge of the joint face of the first component and/or the second component, and the water stop strip is solidified through acrylate slurry.
Correspondingly, the embodiment of the invention also provides a process for manufacturing the novel concrete joint structure, which comprises the following steps:
s1: preparing raw materials for manufacturing a first component, a second component and epoxy mortar;
s2: when the first component and the second component are prefabricated, steel fibers are doped into concrete;
s3: welding pre-embedded connecting devices on the reinforcement cages of the first component and the second component;
s4: chiseling the joint surfaces of the first member and the second member to enable the steel fibers to be exposed on the surfaces, enabling the exposed length to be not less than 3mm and not more than 50% of the total length of the steel fibers, and adjusting the exposed steel fibers to be 45-90 degrees with the joint surfaces;
s5: preparing an epoxy acetone solution, wherein the concentration of epoxy resin is 10-30 wt%, and each weight percentage of the epoxy resin is 1-3 parts and the acetone is 9-7 parts;
s6: quickly adhering the thickness limiting device to the joint surface of the first member, aligning the first member with the second member, arranging a water stop strip at the bottom of the joint of the first member and the second member, quickly installing a bottom template and a side template, and enabling the bottom template and the side template to form a single-side-opening perfusion cavity with the joint surface of the first member and the second member;
s7: pouring the prepared epoxy mortar into a pouring cavity, and vibrating by adopting a flat vibrator to prevent the occurrence of empty drum and the like, wherein the pouring time is limited within 20 minutes, and the vibrating time is more than 10 minutes;
s8: connecting the tensioning and positioning device with the pre-buried connecting device, penetrating the tensioning and positioning device with a tensioning steel bar, and installing a base plate, an anchoring device and a force sensor;
s9: tensioning the tensioning steel bars by adopting an oil pump, applying pretightening force to the first component and the second component by the tensioning steel bars through a base plate, an anchoring device and a pre-buried connecting device, and controlling the pretightening force to be 1-4 MPa;
s10: and after the maintenance is finished, removing the mold to form an epoxy mortar joint, arranging a water stop strip on the upper part of the joint, and uniformly pouring acrylate slurry on the water stop strip.
The embodiment of the invention has the following beneficial effects:
(1) by carrying out a series of treatments on the concrete connection surface, the condition of the concrete connection surface can be effectively improved, so that the surface and the epoxy mortar have better cohesiveness;
(2) the novel concrete joint structure and the manufacturing method thereof are provided, and the mechanical properties such as crack resistance, bending resistance, shear resistance and the like and the durability of the joint of the concrete member can be effectively improved, so that the structure has better overall performance and longer service life.
Drawings
FIG. 1 is a front schematic view of a novel concrete joint construction when unconnected.
Fig. 2 is a cross-sectional view a-a of a novel concrete joint structure.
Fig. 3 is a front schematic view of a new concrete joint structure after joining.
Fig. 4 is a B-B sectional view of a novel concrete joint structure.
Fig. 5 is a C-C sectional view of a novel concrete joint structure.
Fig. 6 is an exploded view of a novel concrete joint construction.
The device comprises a first component 1, a second component 2, an embedded connecting device 3, a precoating layer 4, a stop-up water bar 51, acrylate slurry 52, a bottom template 53, a side template 54, a tensioning positioning device 61, a backing plate 62, an anchoring device 63, a force sensor 7, a tensioning steel bar 8, epoxy mortar 9, steel fibers 101, a prefabricated groove 102 and a thickness limiting device 103.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 6, a novel concrete joint structure comprises a first member 1, a second member 2, an embedded connecting device 3, a precoat layer 4, a water stop strip 51, acrylate slurry 52, a bottom formwork 53, a side formwork 54, a tensioning and positioning device 61, a backing plate 62, an anchoring device 63, a force sensor 7, a tensioning steel bar 8, epoxy mortar 9, steel fibers 101, a prefabricated groove 102 and a thickness limiting device 103.
The first member 1 and the second member 2 are prefabricated bridge concrete bridge decks and need to be spliced when being transported to the site. The joint of the first member 1 and the second member 2 needs to be subjected to a plurality of surface treatment processes, and the first member 1 and the second member 2 are integrally connected through epoxy mortar 9. The embedded connecting device 3 is embedded inside the first member 1 and the second member 2 when the first member 1 and the second member 2 are manufactured. The precoat layer 4 is coated on the surface of the joint part of the first member 1 and the second member 2, and the water stop strips 51 are arranged at the top and the bottom of the joint of the first member 1 and the second member 2.
The specific method for installing the water stop strip 51 is as follows: after the first component 1 and the second component 2 are placed at the designated positions, for example, at the edge of the seam surface, a water stop strip 51 is arranged at the bottom of the seam of the first component 1 and the second component 2 in a bonding mode, and acrylate slurry 52 is injected into the water stop strip 51 to be solidified to form the function of lower water stop; and after the epoxy mortar is solidified at the joint of the first member 1 and the second member 2, another water stop strip 51 is arranged at the upper part of the joint of the first member 1 and the second member 2, and acrylate slurry 52 is injected into the water stop strip 51 to be solidified to form the function of water stop at the upper part, so that double-layer water prevention can be realized, and the structure has better durability at the joint.
When the first member 1 and the second member 2 are jointed, the bottom form 53 and the side form 54 are respectively provided at the bottom and the side of the joint portion for preventing mortar from leaking.
The tensioning and positioning device 61, the backing plate 62, the anchoring device 63, the force sensor 7 and the tensioning steel bar 8 are connected with the embedded connecting devices arranged on the first component 1 and the second component 2 according to a steel bar tensioning process. Fully stirring steel fibers and 101 concrete to form a whole when the first component 1 and the second component 2 are prefabricated, arranging a grout stopping belt at a formwork on the joint surface of the first component 1 and the second component 2, and removing the formwork and the grout stopping belt to form a prefabricated groove 102 after the concrete is solidified. The thickness limiting device 103 is disposed on a joint surface of the member.
The first member 1 and the second member 2 are prefabricated members and adopt concrete with the grade not lower than C40; the embedded connecting device 3 is welded on a reinforcement cage when the first component 1 and the second component 2 are prefabricated, high-strength alloy steel is adopted, the tensile strength is 1000MPa, the embedded connecting device 3 penetrates through the first component 1 and the second component 2, and the connecting parts of the embedded connecting device are positioned on two sides of the first component 1 and the second component 2; the precoating layer 4 adopts 15wt% epoxy acetone solution to coat the precoating layer on the joint surface of the first component 1 and the second component 2 for 15 times; the water stop strip 51 can expand rapidly when encountering the acrylate slurry 52; the bottom template 53 and the side templates 54 are made of foam adhesive materials; the tensioning and positioning device 61 is made of high-strength alloy steel, and the tensile strength is 1000 MPa; the tension steel bar 8 passes through the tension positioning device and adopts a high-strength steel strand; the backing plate 62 penetrates through the tensioning steel bar 8 and is arranged between the force sensor 7 and the tensioning positioning device 61 and between the force sensor 7 and the anchoring device 63, and the backing plate 62 is made of high-strength steel; the force sensor 7 is arranged on one side of the tensioned steel bar 8 and used for detecting the tensioning prestress of the tensioned steel bar 8, the force sensor 7 adopts a range of 30kN, and the precision can reach 0.1 kN; the cross-sectional area of the thickness limiting device 103 is 1/200 of the first member and the second member, the height is 1cm, and a silica gel pad capable of being bonded with the surface of concrete is adopted; the diameter of the steel fiber 101 is 0.1mm, and the length is 2 cm; performing surface processing on the joint surfaces of the first component 1 and the second component 2 doped with the steel fibers 101 to enable the steel fibers 101 to be exposed out of the surfaces, wherein the length of an exposed pair is not less than 10mm, and adjusting the exposed steel fibers 101 to form an angle of 45-90 degrees with the first mounting surface and the second mounting surface; the depth of each prefabricated groove 102 is 2cm, the area is 9cm2, and the epoxy mortar 9 is Bolicon SP101 epoxy mortar.
In the above, the pregroove 102 is preferably a square grid, but not limited to a square grid, and may also be a circular grid, a diamond grid, or other shapes; the area is preferably 1cm2To 4cm2。
According to the invention, the surface of the joint of the first member 1 and the second member 2 is coated with the precoating layer, so that the surface condition of the joint of the first member 1 and the second member 2 is improved, fine gaps can be filled with epoxy mortar, the epoxy resin in the precoating layer and the epoxy resin in the epoxy mortar 9 have the same properties and natural compatibility, the surface of the joint of the first member 1 and the second member 2 can be bonded with the epoxy mortar 9 more tightly, and the mechanical property of the structural joint is improved.
The steel fiber 101 is combined with the epoxy mortar 9, the effect is similar to that of concrete and steel bars, the steel fiber 101 makes up the defects of low tensile strength of the epoxy mortar and low bonding strength of the epoxy mortar 9 and the concrete, and the tensile stress of the joint is resisted in a tensile area of the joint, so that the crack resistance and the bending resistance of the joint are improved; the steel fibers 101 and epoxy mortar 9 may also provide considerable shear bearing capacity to the joint.
The prefabricated groove 102 can effectively increase the bonding area between the surface of the joint of the first member 1 and the second member 2 and the epoxy mortar 9, so that the crack resistance and the bending resistance of the joint are improved, and after the epoxy mortar is solidified, the epoxy mortar and the surface of the joint of the first member 1 and the second member 2 form a tooth-like shape, so that the vertical shear resistance of the structure can be enhanced.
The bonding condition of the surfaces of the joints of the epoxy mortar 9 and the first component 1 and the second component 2 can be improved through the matching structure of the pre-buried connecting device, the tensioning positioning device 61, the base plate 62, the anchoring device 63, the force sensor 7 and the tensioning steel bar 8, free air is extruded, the surfaces of the joints of the epoxy mortar 9 and the first component 1 and the second component 2 are connected more tightly, and the mechanical property of the joints is more stable.
The anchoring means 63 may be selected as anchoring bolts or anchoring piers.
The embodiment of the invention also provides a process for manufacturing the novel concrete joint structure, which comprises the following steps:
(1) preparing raw materials for manufacturing a first component, a second component and epoxy mortar.
(2) When the first component and the second component are prefabricated, a proper amount of steel fiber materials (the diameter range of the steel fibers is 0.1 mm-0.5 mm, and high-strength steel with good bonding performance with concrete and epoxy mortar is adopted) are mixed into concrete, and pre-embedded connecting devices are welded on reinforcement cages of the first component and the second component; if the structure is reinforced, holes are arranged on two parts of the damaged component, and the embedded connecting device is installed.
(3) And arranging a grout stop belt at the template of the joint surface of the first member and the second member, pouring concrete, maintaining for 28 days, removing the template and the grout stop belt, and forming a prefabricated groove on the joint surface (the construction process for reinforcing the structure does not contain the step).
(4) And treating the joint surfaces of the maintained first member and the second member, chiseling the joint surfaces to expose the steel fibers on the surfaces, wherein the exposed length is not less than 3mm and not more than 50% of the total length of the steel fibers, and adjusting the exposed steel fibers to form an angle of 45-90 degrees with the joint surfaces.
(5) And (4) cleaning the joint surface treated in the step (4) by adopting a method of spraying clear water by a water pump.
(6) After the joint surface is naturally dried, the surface is further cleaned by alcohol with the purity of more than 90 percent.
(7) Preparing an epoxy acetone solution, wherein the concentration of the epoxy resin is 10-30 wt%, namely 1-3 parts of epoxy resin and 9-7 parts of acetone, and smearing the epoxy acetone solution on the treated joint surface for 10-15 times.
(8) And quickly adhering the thickness limiting device to the joint surface of the first member, aligning the first member and the second member, arranging a water stop strip at the bottom of the joint of the first member and the second member, quickly installing a bottom template and a side template, and enabling the bottom template and the side template to form a single-side-opening perfusion cavity with the joint surface of the first member and the second member.
(9) And pouring the prepared epoxy mortar into the pouring cavity, and vibrating by using a flat vibrator to prevent the conditions of hollowing and the like, wherein the pouring time is limited within 20 minutes, and the vibrating time is more than 10 minutes.
(10) Connecting the tensioning and positioning device with the pre-buried connecting device, enabling the tensioning steel bar to pass through the tensioning and positioning device, and installing a base plate, an anchoring device and a force sensor (the measuring range is 30 kN-50 kN); and (3) tensioning the tensioned steel bars by adopting an oil pump, applying pretightening force to the first component and the second component by the tensioned steel bars through the base plate, the anchoring devices and the embedded connecting devices, controlling the pretightening force to be 1-4 MPa, removing the base plate, the force sensor, the anchoring devices, the tensioning positioning devices and the tensioned steel bars after stabilizing for 4 hours, and cutting off the embedded connecting devices higher than the surfaces of the first component or the second component.
(11) The concrete joint structure is maintained for 7 days, the mold is removed, the epoxy mortar joint is formed, the water stop strip is arranged on the upper portion of the joint, and the water stop strip is evenly poured by adopting acrylate slurry, so that the water stop strip expands to play a waterproof role, and the novel concrete joint structure is completed.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (1)
1. A process for making a concrete joint structure, comprising the steps of:
s1: preparing raw materials for manufacturing a first component, a second component and epoxy mortar;
s2: when the first component and the second component are prefabricated, steel fibers are doped into concrete;
s3: welding pre-buried connecting devices on the reinforcement cages of the first component and the second component, wherein the pre-buried connecting devices are pre-buried in the first component and the second component and have parts exposing the surfaces of the first component and the second component;
s4: chiseling the joint surfaces of the first member and the second member to enable the steel fibers to be exposed on the surfaces, enabling the exposed length to be not less than 3mm and not more than 50% of the total length of the steel fibers, and adjusting the exposed steel fibers to be 45-90 degrees with the joint surfaces;
s5: preparing an epoxy acetone solution, wherein the concentration of epoxy resin is 10-30 wt%, 1-3 parts of epoxy resin and 9-7 parts of acetone are coated on the joint surfaces of the first component and the second component to form a precoating layer;
s6: quickly adhering a thickness limiting device to the joint surface of the first member, aligning the first member with the second member, arranging a water stop strip at the bottom of the joint of the first member and the second member, quickly installing a bottom template and a side template, and enabling the bottom template and the side template to form a single-side-opening perfusion cavity with the joint surface of the first member and the second member, wherein the section of the thickness limiting device is 1/200 of the joint surface;
s7: pouring the prepared epoxy mortar into a pouring cavity, and vibrating by adopting a flat vibrator to prevent a hollowing condition, wherein the pouring time is limited within 20 minutes, and the vibrating time is more than 10 minutes;
s8: connecting the tensioning and positioning device with the pre-buried connecting device, penetrating the tensioning and positioning device with a tensioning steel bar, and installing a base plate, an anchoring device and a force sensor;
s9: tensioning the tensioned steel bars by adopting an oil pump, applying pretightening force to the first component and the second component by the tensioned steel bars through the base plate, the anchoring devices and the pre-embedded connecting devices, controlling the pretightening force to be 1-4 Mpa, and removing the base plate, the force sensor, the anchoring devices, the tensioning positioning devices and the tensioned steel bars after the structure is stable;
s10: and after the maintenance is finished, removing the mold to form an epoxy mortar joint, arranging a water stop strip on the upper part of the joint, and uniformly pouring acrylate slurry on the water stop strip.
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| CN112942146B (en) * | 2021-02-03 | 2023-02-03 | 中国建筑第八工程局有限公司 | Weld fatigue resistance reinforcing structure and reinforcing method thereof |
| CN114182753A (en) * | 2021-11-02 | 2022-03-15 | 广州地铁设计研究院股份有限公司 | Subway station assembled middle plate structure and construction method thereof |
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