CN114875791B - Construction process of large-span anti-crack capping beam - Google Patents
Construction process of large-span anti-crack capping beam Download PDFInfo
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- CN114875791B CN114875791B CN202210573141.7A CN202210573141A CN114875791B CN 114875791 B CN114875791 B CN 114875791B CN 202210573141 A CN202210573141 A CN 202210573141A CN 114875791 B CN114875791 B CN 114875791B
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- 238000010276 construction Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 89
- 239000004917 carbon fiber Substances 0.000 claims abstract description 89
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000004567 concrete Substances 0.000 claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000012423 maintenance Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 60
- 238000009434 installation Methods 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 8
- 239000004746 geotextile Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000011513 prestressed concrete Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000004075 alteration Effects 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 1
- 238000007788 roughening Methods 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a construction process of a large-span anti-crack capping beam. The construction process of the large-span crack-resistant capping beam comprises the following steps of S1: roughening the pier top; s2: installing a transverse Bailey beam and erecting a disc buckle bracket; s3: installing an operation platform and a bottom beam template; s4: processing and installing a bent cap steel bar; s5: installing a side die; s6: pouring concrete and removing the mould for maintenance; s7: pre-stress construction; s8: and (5) treating surface cracks of the capping beam. The construction process of the large-span anti-crack bent cap provided by the invention has the advantages of improving and reducing the surface crack of the bent cap and preventing the slipping of the carbon fiber plate in the tensioning process.
Description
Technical Field
The invention relates to the technical field of prefabricated part production, in particular to a construction process of a large-span crack-resistant bent cap.
Background
The capping beam is a connecting structure between the bridge plate and the bridge columns, the capping beam system is a main component part of the bridge abutment, the load on the upper part of the bridge is mainly transmitted to the bridge abutment through the support, then the load is transmitted to the foundation, and the capping beam of the bridge pier plays a role in supporting the bridge abutment in the process. Along with the gradual perfection of construction technology and continuous innovation of designers, the forms of the bent caps also show various forms, such as rectangular bent caps, T-shaped bent caps, inverted T-shaped bent caps, groove-shaped bent caps and the like, and the structural characteristics of the bent caps are developed from a concrete structure in a general sense to a prestressed concrete structure. In general, the capping beam is subjected to horizontal force, vertical force and bending moment in various directions of the upper structure, and is also subjected to wind force, running water pressure, possibly generated earthquake force, impact force of ships and drift, ice pressure, impact force of city automobiles, and the like. In summary, the design and construction of the capping beam should ensure the influence of various adverse loads to ensure the strength, rigidity and stability of the pier. For the traditional bent cap, the importance of the bent cap member is also easy to be ignored by designers, so that certain bridges are required to be reinforced and maintained just after being put into use.
From the long-term service performance of the bridge structure, once cracks occur, the permeability of the concrete is increased, and the durability of the concrete is reduced, so that the safety of the whole bridge is affected; when the gap appears on the surface of the capping beam, workers adopt a prestress carbon fiber plate reinforcing method to process the gap of the capping beam, but in the tensioning process of the carbon fiber plate, the clamping force between the clamp and the carbon fiber plate is insufficient due to overlarge gap between the clamp and the carbon fiber plate, so that the prestress carbon fiber plate slips when prestress is applied.
Therefore, it is necessary to provide a new construction process for a large-span anti-cracking capping beam to solve the above technical problems.
Disclosure of Invention
The invention solves the technical problem of providing a construction process of a large-span crack-resistant bent cap, which reduces the surface cracks of the bent cap and prevents slipping in the tensioning process of a carbon fiber plate.
In order to solve the technical problems, the construction process of the large-span anti-crack capping beam provided by the invention comprises the following steps: s1: roughening the pier top; the concrete on the column top is entirely chiseled by adopting a high-pressure water jet process, fresh concrete is exposed, and the concrete is cleanly washed, so that the firm connection between the upright column and the bent cap concrete is ensured; s2: installing a transverse Bailey beam and erecting a disc buckle bracket; firstly, pouring a concrete cushion layer, and arranging four rows of transverse bridge-oriented bailey pieces on the concrete cushion block, wherein the bailey pieces are connected through a 90-type support frame; the vertical bridge distribution beams are erected on the bailey pieces every 75cm, I14I-steel is paved, and the disc buckle support is erected on the I-steel, so that the whole stress stability and firmness of a capping beam support system are ensured; the bottom of the upright post is connected with the I-steel cross beam and the Bailey beam by bolts, so that reliable connection is ensured; s3: installing an operation platform and a bottom beam template; the bent cap construction operation platform adopts a disc buckle bracket as a main stressed support, the width of the construction platform is not less than 80cm, and guard rails are erected around the construction platform by steel pipes; the installation and construction error of the elevation of the bottom die of the bent cap is not more than +/-5 mm, the axis deviation error is not more than +/-10 mm, double-sided adhesive tapes are padded between joints of the templates, the surfaces are filled with putty and stricken, and concrete surface chromatic aberration or pitting caused by joint slurry leakage is prevented; s4: processing and installing a bent cap steel bar; measuring and paying off after the bottom die is detected to be qualified, marking the positions of the steel bars on a template, then installing the steel bars of the bent cap, arranging a combined jig on a site of a steel bar processing factory by using a factory process, and integrally hoisting and transporting the main bars, stirrups and stand bars and the steel bar framework after finishing the processing to the site for installation; s5: installing a side die; after the construction of the reinforcement bar binding and embedded part is checked to be qualified, performing side mold construction; the side dies are designed and manufactured by a professional template factory by adopting a shaping steel die, rust removal is carried out before installation, a release agent is uniformly coated after the polishing is clean, joints between the side dies and joints between the side dies and the bottom die are required to be tight, and double-sided adhesive tapes are added to prevent slurry leakage; the side die adopts a split bolt for reinforcement, a support is arranged in the side die, steel pipes are adopted as transverse belts and vertical belts at the outer side of the side die, and the side die and the bottom die distribution beam are connected by turnbuckle screws so as to adjust the verticality of the side die; s6: pouring concrete and removing the mould for maintenance; before entering the mould, checking slump and uniformity of concrete, wherein pouring sequences are layered and symmetrically poured from the connection part of the pier column to two ends, the thickness of each layer is not more than 30cm, concrete vibration stops sinking by a concrete surface, and obvious rising of bubbles and flat and consistent surface are avoided; when the upper layer concrete is poured, the vibrating rod is inserted into the lower layer concrete by not less than 10cm; the concrete is poured once, and pouring is continuously carried out; covering the concrete with geotextile or plastic cloth for watering and curing after the initial setting of the concrete, so as to ensure that the surface of the concrete is always in a wet state; when the concrete strength of the bent cap reaches 2.5MPa, dismantling the side mould under the condition of not damaging the edges and corners, and immediately covering the side mould with geotextile or plastic cloth for watering and curing after dismantling the side mould; when the concrete strength of the bent cap reaches more than 80% of the design strength, the bearing bottom die is dismantled; s7: pre-stress construction; after the concrete strength reaches 100% of the tensile strength allowed by the design, the prestressed concrete structure of the capping beam adopts intelligent prestress tensioning grouting equipment to perform prestress construction in time, and the prestress pipeline grouting adopts a vacuum grouting process; the construction process comprises the following steps: clearing holes, penetrating bundles, stretching and anchoring, grouting a pore canal, curing and sealing anchors; after the steel bundles are stretched, resetting and welding the steel bars, wherein double-sided welding is adopted, and the length of a welding line is 5d; s8: treating surface cracks of the capping beam;
adopting a main body to symmetrically reinforce cracks on the surface of the bent cap; wherein the body comprises: the carbon fiber plate is fixed on the side wall of the bent cap; the fixing mechanism comprises a mounting plate, a second fixing bolt, a second screw rod, a base plate, a second fixing sleeve, a second pressing plate, a groove and a limiting plate, wherein the mounting plate is fixed on the side wall of the bent cap through the second fixing bolt, one end of the mounting plate is provided with the base plate, and the side wall of the base plate is abutted against the carbon fiber plate; the side wall edge of the mounting plate is symmetrically and fixedly connected with the second screw rod, the side wall of the second screw rod is in sliding connection with the second pressing plate, the second screw rod is in threaded connection with the second fixing sleeve, and two ends of the second pressing plate respectively abut against the second fixing sleeve and the carbon fiber plate; the bottom end of the second pressing plate is provided with the groove, the limiting plate is obliquely arranged in the groove, and the limiting plate abuts against the side wall of the carbon fiber plate; the reinforcing mechanism is fixed on the side wall of the bent cap and is abutted against the carbon fiber plate; the mounting mechanism is connected to the side wall of the bent cap; the extrusion mechanism is arranged on the side wall of the mounting mechanism and is connected with the side wall of the mounting plate; and the traction mechanism is connected with the extrusion mechanism and the installation mechanism.
Preferably, the reinforcing mechanism comprises a fixing plate, a first fixing bolt, a first screw rod, a first pressing plate, a first fixing sleeve and a pressing block, wherein the fixing plate is fixed on the side wall of the capping beam through the first fixing bolt, the first screw rod is arranged on the side wall of the fixing plate, and the side wall of the first screw rod is connected with the first pressing plate in a sliding manner; the side wall of the first screw rod is in threaded connection with the first fixing sleeve, and two ends of the first pressing plate respectively abut against the first fixing sleeve and the carbon fiber plate; the bottom equidistance installation lateral wall of first clamp plate is curved the briquetting, just the briquetting is contradicted the lateral wall of carbon fiber board.
Preferably, the mounting mechanism comprises a support plate, a third fixing bolt and a support beam, wherein the support plate is fixed on the side wall of the cover beam through the third fixing bolt, and the support beam is mounted on the side wall of the support plate.
Preferably, the carbon fiber plate is positioned between the two support plates, and the support beam and the carbon fiber plate are mutually perpendicular.
Preferably, the extrusion mechanism comprises a jack, a sliding sleeve and a connecting beam, wherein the jack is symmetrically arranged on the side wall of the supporting beam, and one end of the jack is connected with the connecting beam; the side walls of the mounting plates are symmetrically and fixedly connected with the connecting beams, and one end of each connecting beam is fixedly connected with the sliding sleeve.
Preferably, the traction mechanism comprises a first connecting rod, a sliding chute, a guide rod, a second connecting rod, a fixed block, a hexagonal prism, an elastic sheet and a convex block, wherein the guide rod is symmetrically arranged on the side wall of the supporting beam, and the side wall of the guide rod is in sliding connection with the sliding sleeve; the side wall of the guide rod is provided with the chute, and the spherical fixed block is arranged in the chute; the side wall of the fixed block is fixedly connected with the first connecting rod, the second connecting rod and the hexagonal prism are connected in a sliding manner in the first connecting rod, and two ends of the second connecting rod are respectively and fixedly connected with the sliding sleeve and the hexagonal prism; the side wall equidistance of second connecting rod is installed the shell fragment, the internally mounted of head rod polylith the lug, just the shell fragment with sliding connection between the lug.
Preferably, the inner section of the first connecting rod is hexagonal, and the first connecting rod is slidably connected with the inner part of the guide rod.
Preferably, the bottom surface of the second pressing plate and the top surface of the backing plate are arc-shaped structures, and one end of the limiting plate is aligned with the arc-shaped protrusion of the backing plate.
Compared with the related art, the construction process of the large-span anti-crack capping beam has the following beneficial effects:
the invention provides a construction process of a large-span anti-crack capping beam, which is characterized in that after concrete is initially set in a template, geotextile or plastic cloth is used for covering watering and curing, so that the surface of the concrete is always in a wet state, and cracks on the surface of the concrete are reduced; when the concrete strength of the bent cap reaches 2.5MPa, dismantling the side mould under the condition of not damaging the edges and corners, and immediately covering the side mould with geotextile or plastic cloth for watering and curing after dismantling the side mould; when the concrete strength of the bent cap reaches more than 80% of the design strength, the bearing bottom die is removed, so that the surface of the concrete is prevented from being removed in the process that the hardness of the surface of the concrete does not reach the standard, and cracks on the surface of the concrete are further reduced; when cracks appear on the surface of the bent cap and reinforcement is needed, the two mounting plates are respectively fixed on the side wall of the bent cap by using the second fixing bolts, one end of the carbon fiber plate is placed on the surface of the base plate, the second pressing plate penetrates through the second screw rod, the second fixing sleeve is in threaded connection with the second screw rod, and the second pressing plate is pushed to move towards the direction of the carbon fiber plate along with the rotation of the second fixing sleeve on the side wall of the second screw rod, so that the second pressing plate moves to press the side wall of the carbon fiber plate in a collision mode, the bottom surface of the second pressing plate and the top surface of the base plate are of arc-shaped structures, the carbon fiber plate clamped between the second pressing plate and the base plate is in an arc-shaped state, and the friction force between the carbon fiber plate and the second pressing plate and the base plate is increased; when the extrusion mechanism stretches the carbon fiber plate, the limiting plate inside the groove is abutted against the side wall of the carbon fiber plate, the bottom end of the limiting plate is aligned with the arc-shaped bulge of the backing plate, and when the carbon fiber plate between the second pressing plate and the backing plate is pulled, the limiting plate is clamped at one end of the bulge of the carbon fiber plate, so that the resistance of the movement of the carbon fiber plate is further increased, and the carbon fiber plate is prevented from slipping.
Drawings
Fig. 1 is a schematic structural view of a construction process of a large-span anti-crack capping beam provided by the invention;
FIG. 2 is a bottom view of the securing mechanism shown in FIG. 1;
FIG. 3 is a schematic view of the internal structure of the fixing mechanism shown in FIG. 2;
FIG. 4 is an enlarged schematic view of the structure shown in FIG. 3 at A;
FIG. 5 is a bottom view of the mounting mechanism of FIG. 1;
FIG. 6 is a view showing a structural view of the support beam shown in FIG. 5;
FIG. 7 is a view showing the internal structure of the guide bar shown in FIG. 6;
FIG. 8 is a schematic view of the interior of the first connecting rod shown in FIG. 6;
fig. 9 is a construction process diagram of the large-span anti-cracking bent cap provided by the invention.
Reference numerals in the drawings: 1. the device comprises a capping beam, 2, a carbon fiber plate, 3, a reinforcing mechanism, 31, a fixing plate, 32, a first fixing bolt, 33, a first screw rod, 34, a first pressing plate, 35, a first fixing sleeve, 36, a pressing block, 4, a fixing mechanism, 41, a mounting plate, 42, a second fixing bolt, 43, a second screw rod, 44, a backing plate, 45, a second fixing sleeve, 46, a second pressing plate, 47, a groove, 48, a limiting plate, 5, a mounting mechanism, 51, a supporting plate, 52, a third fixing bolt, 53, a supporting beam, 6, an extrusion mechanism, 61, a jack, 62, a sliding sleeve, 63, a connecting beam, 7, a traction mechanism, 71, a first connecting rod, 72, a sliding chute, 73, a guide rod, 74, a second connecting rod, 75, a fixing block, 76, a hexagonal prism, 77, a spring plate, 78, a bump, 100 and a main body.
Detailed Description
The invention will be further described with reference to the drawings and embodiments.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, and fig. 9 in combination, fig. 1 is a schematic structural diagram of a construction process of a large-span anti-cracking capping beam according to the present invention; FIG. 2 is a bottom view of the securing mechanism shown in FIG. 1; FIG. 3 is a schematic view of the internal structure of the fixing mechanism shown in FIG. 2; FIG. 4 is an enlarged schematic view of the structure shown in FIG. 3 at A; FIG. 5 is a bottom view of the mounting mechanism of FIG. 1; FIG. 6 is a view showing a structural view of the support beam shown in FIG. 5; FIG. 7 is a view showing the internal structure of the guide bar shown in FIG. 6; FIG. 8 is a schematic view of the interior of the first connecting rod shown in FIG. 6; fig. 9 is a construction process diagram of the large-span anti-cracking bent cap provided by the invention. The construction process of the large-span anti-crack capping beam comprises the following steps: s1: roughening the pier top; the concrete on the column top is entirely chiseled by adopting a high-pressure water jet process, fresh concrete is exposed, and the concrete is cleanly washed, so that the firm connection between the upright column and the bent cap concrete is ensured; s2: installing a transverse Bailey beam and erecting a disc buckle bracket; firstly, pouring a concrete cushion layer, and arranging four rows of transverse bridge-oriented bailey pieces on the concrete cushion block, wherein the bailey pieces are connected through a 90-type support frame; the vertical bridge distribution beams are erected on the bailey pieces every 75cm, I14I-steel is paved, and the disc buckle support is erected on the I-steel, so that the whole stress stability and firmness of a capping beam support system are ensured; the bottom of the upright post is connected with the I-steel cross beam and the Bailey beam by bolts, so that reliable connection is ensured; s3: installing an operation platform and a bottom beam template; the bent cap construction operation platform adopts a disc buckle bracket as a main stressed support, the width of the construction platform is not less than 80cm, and guard rails are erected around the construction platform by steel pipes; the installation and construction error of the elevation of the bottom die of the bent cap is not more than +/-5 mm, the axis deviation error is not more than +/-10 mm, double-sided adhesive tapes are padded between joints of the templates, the surfaces are filled with putty and stricken, and concrete surface chromatic aberration or pitting caused by joint slurry leakage is prevented; s4: processing and installing a bent cap steel bar; measuring and paying off after the bottom die is detected to be qualified, marking the positions of the steel bars on a template, then installing the steel bars of the bent cap, arranging a combined jig on a site of a steel bar processing factory by using a factory process, and integrally hoisting and transporting the main bars, stirrups and stand bars and the steel bar framework after finishing the processing to the site for installation; s5: installing a side die; after the construction of the reinforcement bar binding and embedded part is checked to be qualified, performing side mold construction; the side dies are designed and manufactured by a professional template factory by adopting a shaping steel die, rust removal is carried out before installation, a release agent is uniformly coated after the polishing is clean, joints between the side dies and joints between the side dies and the bottom die are required to be tight, and double-sided adhesive tapes are added to prevent slurry leakage; the side die adopts a split bolt for reinforcement, a support is arranged in the side die, steel pipes are adopted as transverse belts and vertical belts at the outer side of the side die, and the side die and the bottom die distribution beam are connected by turnbuckle screws so as to adjust the verticality of the side die; s6: pouring concrete and removing the mould for maintenance; before entering the mould, checking slump and uniformity of concrete, wherein pouring sequences are layered and symmetrically poured from the connection part of the pier column to two ends, the thickness of each layer is not more than 30cm, concrete vibration stops sinking by a concrete surface, and obvious rising of bubbles and flat and consistent surface are avoided; when the upper layer concrete is poured, the vibrating rod is inserted into the lower layer concrete by not less than 10cm; the concrete is poured once, and pouring is continuously carried out; covering the concrete with geotextile or plastic cloth for watering and curing after the initial setting of the concrete, so as to ensure that the surface of the concrete is always in a wet state; when the concrete strength of the bent cap 1 reaches 2.5MPa, dismantling the side mould under the condition of not damaging the edges and corners, and immediately covering the side mould with geotextile or plastic cloth for watering and curing after dismantling the side mould; when the concrete strength of the bent cap reaches more than 80% of the design strength, the bearing bottom die is dismantled; s7: pre-stress construction; after the concrete strength reaches 100% of the tensile strength allowed by the design, the prestressed concrete structure of the capping beam adopts intelligent prestress tensioning grouting equipment to perform prestress construction in time, and the prestress pipeline grouting adopts a vacuum grouting process; the construction process comprises the following steps: clearing holes, penetrating bundles, stretching and anchoring, grouting a pore canal, curing and sealing anchors; after the steel bundles are stretched, resetting and welding the steel bars, wherein double-sided welding is adopted, and the length of a welding line is 5d; s8: treating surface cracks of the capping beam; adopting a main body 100 to symmetrically reinforce cracks on the surface of the bent cap 1; wherein the main body 100 includes:
a carbon fiber plate 2, wherein the carbon fiber plate 2 is fixed on the side wall of the bent cap 1; the fixing mechanism 4 comprises a mounting plate 41, a second fixing bolt 42, a second screw 43, a backing plate 44, a second fixing sleeve 45, a second pressing plate 46, a groove 47 and a limiting plate 48, wherein the mounting plate 41 is fixed on the side wall of the bent cap 1 through the second fixing bolt 42, one end of the mounting plate 41 is provided with the backing plate 44, and the side wall of the backing plate 44 is abutted against the carbon fiber plate 2; the side wall edge of the mounting plate 41 is symmetrically and fixedly connected with the second screw rod 43, the side wall of the second screw rod 43 is slidably connected with the second pressing plate 46, the second screw rod 43 is in threaded connection with the second fixing sleeve 45, and two ends of the second pressing plate 46 respectively abut against the second fixing sleeve 45 and the carbon fiber plate 2; the bottom end of the second pressing plate 46 is provided with the groove 47, the limiting plate 48 is obliquely arranged in the groove 47, and the limiting plate 48 abuts against the side wall of the carbon fiber plate 2; the reinforcing mechanism 3 is fixed on the side wall of the bent cap 1, and the reinforcing mechanism 3 is abutted against the carbon fiber plate 2; a mounting mechanism 5, wherein the mounting mechanism 5 is connected to the side wall of the bent cap 1; a pressing mechanism 6, wherein the pressing mechanism 6 is mounted on the side wall of the mounting mechanism 5, and the pressing mechanism 6 is connected with the side wall of the mounting plate 41; a traction mechanism 7, wherein the traction mechanism 7 connects the extrusion mechanism 6 and the mounting mechanism 5.
The reinforcing mechanism 3 comprises a fixed plate 31, a first fixed bolt 32, a first screw rod 33, a first pressing plate 34, a first fixed sleeve 35 and a pressing block 36, wherein the fixed plate 31 is fixed on the side wall of the capping beam 1 through the first fixed bolt 32, the first screw rod 33 is arranged on the side wall of the fixed plate 31, and the side wall of the first screw rod 33 is connected with the first pressing plate 34 in a sliding manner; the side wall of the first screw 33 is in threaded connection with the first fixing sleeve 35, and two ends of the first pressing plate 34 respectively abut against the first fixing sleeve 35 and the carbon fiber plate 2; the pressing blocks 36 with arc-shaped side walls are equidistantly arranged at the bottom end of the first pressing plate 34, and the pressing blocks 36 are abutted against the side walls of the carbon fiber plates 2; in order to facilitate the fixing of the fixing plate 31 to the side wall of the capping beam 1 by the first fixing bolt 32, the first pressing plate 34 penetrates through the first screw 33, the first fixing sleeve 35 is in threaded connection with the first screw 33, and the first pressing plate 34 is pushed to approach the carbon fiber board 2 along with the rotation of the first fixing sleeve 35, so that the pressing block 36 with an arc-shaped side wall is in contact with the carbon fiber board 2, and support is provided for the carbon fiber board 2.
The mounting mechanism 5 includes a support plate 51, a third fixing bolt 52 and a support beam 53, the support plate 51 is fixed on the side wall of the capping beam 1 by the third fixing bolt 52, and the support beam 53 is mounted on the side wall of the support plate 51, and the third fixing funnel 52 fixes the support plate 51 on the side wall of the capping beam 1 for convenience of a cylinder cover, thereby fixing the support beam 53 and the jack 61.
The extrusion mechanism 6 comprises a jack 61, a sliding sleeve 62 and a connecting beam 63, wherein the jack 61 is symmetrically arranged on the side wall of the supporting beam 53, and one end of the jack 61 is connected with the connecting beam 63; the side walls of one of the mounting plates 41 are symmetrically and fixedly connected with the connecting beam 63, one end of the connecting beam 63 is fixedly connected with the sliding sleeve 62, the carbon fiber plate 2 is positioned between the two support plates 51, the support beams 53 and the carbon fiber plate 2 are mutually perpendicular, and in order to facilitate one end of the carbon fiber plate 2 to be fixed on the mounting plate 41 connected with the connecting beam 63, the jack 61 moves to push the connecting beam 63 and the mounting plate 41 to move, so that the mounting plate 41 stretches the carbon fiber plate 2.
The traction mechanism 7 comprises a first connecting rod 71, a sliding chute 72, a guide rod 73, a second connecting rod 74, a fixed block 75, a hexagonal prism 76, a spring plate 77 and a bump 78, wherein the guide rod 73 is symmetrically arranged on the side wall of the supporting beam 53, and the side wall of the guide rod 73 is in sliding connection with the sliding sleeve 62; the side wall of the guide rod 73 is provided with the chute 72, and the spherical fixed block 75 is arranged in the chute 72; the side wall of the fixing block 75 is fixedly connected with the first connecting rod 71, the inside of the first connecting rod 71 is slidably connected with the second connecting rod 74 and the hexagonal prism 76, and two ends of the second connecting rod 74 are respectively and fixedly connected with the sliding sleeve 62 and the hexagonal prism 76; the elastic pieces 77 are equidistantly arranged on the side wall of the second connecting rod 74, a plurality of protruding blocks 78 are arranged in the first connecting rod 71, and the elastic pieces 77 are in sliding connection with the protruding blocks 78; the inner section of the first connecting rod 71 is hexagonal, the first connecting rod 71 is slidably connected with the inner part of the guide rod 73, in order to stretch the carbon fiber plate 2 when the mounting plate 41 stretches the carbon fiber plate 2, the mounting plate 41, the connecting beam 63 and the sliding sleeve 62 move along the guide rod 73, the sliding sleeve 62 moves along the guide rod 73, along with the elongation of the carbon fiber plate 2, when the sliding sleeve 62 is separated from the guide rod 73, the sliding sleeve 62 pushes the first connecting rod 71 and the fixing block 75 to slide in the sliding groove 72, so that the first connecting rod 71 is guided by the sliding sleeve 62 and the mounting plate 41, the mounting plate 41 moves along the straight line, and the deviation of the position of the carbon fiber plate 2 in the stretching process is avoided; in the same way, when the first connecting rod 71 cannot slide in the chute 72, the second connecting rod 74 drives the hexagonal prism 76 to move in the first connecting rod 71, and the hexagonal prism 76 increases the stability of the movement of the second connecting rod 74; and when the second connecting rod 74 pushes and drives the elastic sheet 77 to slide from the side wall of the protruding block 78, the bending deformation of the elastic sheet 77 passes over the side wall of the protruding block 78, so as to increase the resistance of the second connecting rod 74 moving inside the first connecting rod 71 and prevent the second connecting rod 74 from sliding inside the first connecting rod 71 at will.
The bottom surface of the second pressing plate 46 and the top surface of the backing plate 44 are arc-shaped, and one end of the limiting plate 48 is aligned with the arc-shaped protrusion of the backing plate 44; when the carbon fiber plate 2 between the second pressing plate 46 and the backing plate 44 is pulled, the limiting plate 48 is clamped at one end of the protrusion of the carbon fiber plate 2, so that the resistance of the carbon fiber plate 2 to movement is further increased, and the carbon fiber plate 2 is prevented from slipping.
The working principle of the construction process of the large-span anti-crack capping beam provided by the invention is as follows: when the crack of the side wall of the capping beam 1 needs to be reinforced, positioning and paying-off are performed on the surface of the capping beam 1, the positions for installing the mounting plate 41, the fixing plate 31 and the supporting plate 51 are found, then anchor holes are drilled at designated positions, the insides of the anchor holes are cleaned, and no dust in the insides is guaranteed. The fixing plate 31, the mounting plate 41 and the support plate 51 are fixed to the side wall of the bent cap 1 by the first fixing bolt 32, the second fixing bolt 42 and the third fixing bolt 51, respectively. And coating an adhesive on the pasting position of the capping beam 1 and the surface of the carbon fiber plate 2, and pasting the carbon fiber plate 2 on the pasting position of the surface of the capping beam 1. Placing one end of the carbon fiber plate 2 on the surface of the backing plate 44, penetrating the second pressing plate 46 through the second screw 43, connecting the second fixing sleeve 45 with the second screw 43 in a threaded manner, and along with the rotation of the second fixing sleeve 45 on the side wall of the second screw 43, pushing the second pressing plate 46 to move towards the carbon fiber plate 2 by the second fixing sleeve 45, so that the second pressing plate 46 moves to press against the side wall of the carbon fiber plate 2, the bottom surface of the second pressing plate 46 and the top surface of the backing plate 44 are in an arc-shaped structure, so that the carbon fiber plate 2 clamped between the second pressing plate 46 and the backing plate 44 is in an arc-shaped state, and the friction force between the carbon fiber plate 2 and the second pressing plate 46 and the backing plate 44 is increased; the other end of the carbon fiber plate 2 is fixed to the mounting plate 41 connected to the connection beam 63. The first pressing plate 34 penetrates through the first screw 33, the first fixing sleeve 35 is in threaded connection with the first screw 33, the first pressing plate 34 is pushed to approach the carbon fiber plate 2 along with the rotation of the first fixing sleeve 35, the pressing block 36 with the arc-shaped side wall is in contact with the carbon fiber plate 2, support is provided for the carbon fiber plate 2, and meanwhile the carbon fiber plate 2 is convenient to slide on the side wall of the pressing block 36. And the jack 61 is powered on to operate, and the jack 61 moves to push the connecting beam 63 and the mounting plate 41 to move, so that the mounting plate 41 stretches the carbon fiber board 2. When the carbon fiber plate 2 is stretched, the limiting plate 48 inside the groove 47 abuts against the side wall of the carbon fiber plate 5, the bottom end of the limiting plate 48 is aligned with the arc-shaped bulge of the backing plate 44, and when the carbon fiber plate 2 between the second pressing plate 46 and the backing plate is pulled, the limiting plate 48 is clamped at one end of the bulge of the carbon fiber plate 2, so that the movement resistance of the carbon fiber plate 2 is further increased, and the carbon fiber plate 2 is prevented from slipping. The jack 61 applies a force of 220KN to the connection beam 63 for 5 minutes. When the mounting plate 41 stretches the carbon fiber board 2, the carbon fiber board 2 stretches, the mounting plate 41, the connecting beam 63 and the sliding sleeve 62 move, the sliding sleeve 62 moves along the guide rod 73, and as the carbon fiber board 2 stretches, when the sliding sleeve 62 is separated from the guide rod 73, the sliding sleeve 62 pushes the first connecting rod 71 and the fixed block 75 to slide in the sliding groove 72, so that the first connecting rod 71 is positioned on the sliding sleeve 62 and the mounting plate 41 to provide guidance, the mounting plate 41 moves along the straight line, and the position of the carbon fiber board 2 is prevented from being deviated in the stretching process; in the same way, when the first connecting rod 71 cannot slide in the chute 72, the second connecting rod 74 drives the hexagonal prism 76 to move in the first connecting rod 71, and the hexagonal prism 76 increases the stability of the movement of the second connecting rod 74; and when the second connecting rod 74 pushes and drives the elastic sheet 77 to slide from the side wall of the protruding block 78, the bending deformation of the elastic sheet 77 passes over the side wall of the protruding block 78, so as to increase the resistance of the second connecting rod 74 moving inside the first connecting rod 71 and prevent the second connecting rod 74 from sliding inside the first connecting rod 71 at will. When the stretching of the carbon fiber board 2 is finished, one end of the stretching of the carbon fiber board 2 is fixed by using the second pressing plate 46, and the first fixing sleeve 35 is rotated at the same time, so that the first pressing plate 34 presses the carbon fiber board 2, and the carbon fiber board 2 is fixed on the side wall of the capping beam 1. Finally, the adhesive is waited for to cure under the proper environment temperature and humidity, and antioxidant is smeared on the surfaces of the carbon fiber plate 2, the reinforcing mechanism 3 and the fixing mechanism 4 so as to ensure that the carbon fiber plate 2 has enough service life.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (4)
1. The construction process of the large-span anti-crack capping beam is characterized by comprising the following steps of:
s1: pier top chiseling
The concrete on the column top is entirely chiseled by adopting a high-pressure water jet process, fresh concrete is exposed, and the concrete is cleanly washed, so that the firm connection between the upright column and the bent cap concrete is ensured;
s2: support for installing transverse Bailey beam and erecting disc buckle
Firstly, pouring a concrete cushion layer, and arranging four rows of transverse bridge-oriented bailey pieces on the concrete cushion block, wherein the bailey pieces are connected through a 90-type support frame; the vertical bridge distribution beams are erected on the bailey pieces every 75cm, I14I-steel is paved, and the disc buckle support is erected on the I-steel, so that the whole stress stability and firmness of a capping beam support system are ensured; the bottom of the upright post is connected with the I-steel cross beam and the Bailey beam by bolts, so that reliable connection is ensured;
s3: work platform and bottom beam template installation
The bent cap construction operation platform adopts a disc buckle bracket as a main stressed support, the width of the construction platform is not less than 80cm, and guard rails are erected around the construction platform by steel pipes; the installation and construction error of the elevation of the bottom die of the bent cap is not more than +/-5 mm, the axis deviation error is not more than +/-10 mm, double-sided adhesive tapes are padded between joints of the templates, the surfaces are filled with putty and stricken, and concrete surface chromatic aberration or pitting caused by joint slurry leakage is prevented;
s4: machining and installing of bent cap steel bars
Measuring and paying off after the bottom die is detected to be qualified, marking the positions of the steel bars on a template, then installing the steel bars of the bent cap, arranging a combined jig on a site of a steel bar processing factory by using a factory process, and integrally hoisting and transporting the main bars, stirrups and stand bars and the steel bar framework after finishing the processing to the site for installation;
s5: side form installation
After the construction of the reinforcement bar binding and embedded part is checked to be qualified, performing side mold construction; the side dies are designed and manufactured by a professional template factory by adopting a shaping steel die, rust removal is carried out before installation, a release agent is uniformly coated after the polishing is clean, joints between the side dies and joints between the side dies and the bottom die are required to be tight, and double-sided adhesive tapes are added to prevent slurry leakage; the side die adopts a split bolt for reinforcement, a support is arranged in the side die, steel pipes are adopted as transverse belts and vertical belts at the outer side of the side die, and the side die and the bottom die distribution beam are connected by turnbuckle screws so as to adjust the verticality of the side die;
s6: concrete pouring and demolding maintenance
Before entering the mould, checking slump and uniformity of concrete, wherein pouring sequences are layered and symmetrically poured from the connection part of the pier column to two ends, the thickness of each layer is not more than 30cm, concrete vibration stops sinking by a concrete surface, and obvious rising of bubbles and flat and consistent surface are avoided; when the upper layer concrete is poured, the vibrating rod is inserted into the lower layer concrete by not less than 10cm; the concrete is poured once, and pouring is continuously carried out; covering the concrete with geotextile or plastic cloth for watering and curing after the initial setting of the concrete, so as to ensure that the surface of the concrete is always in a wet state; when the concrete strength of the capping beam (1) reaches 2.5MPa, dismantling the side mould under the condition of not damaging the edges and corners, and immediately covering the side mould with geotextile or plastic cloth for watering and curing after dismantling the side mould; when the concrete strength of the bent cap reaches more than 80% of the design strength, the bearing bottom die is dismantled;
s7: prestressed construction
After the concrete strength reaches 100% of the tensile strength allowed by the design, the prestressed concrete structure of the capping beam adopts intelligent prestress tensioning grouting equipment to perform prestress construction in time, and the prestress pipeline grouting adopts a vacuum grouting process; the construction process comprises the following steps: clearing holes, penetrating bundles, stretching and anchoring, grouting a pore canal, curing and sealing anchors; after the steel bundles are stretched, resetting and welding the steel bars, wherein double-sided welding is adopted, and the length of a welding line is 5d;
s8: capping beam surface crack treatment
Adopting a main body (100) to symmetrically reinforce cracks on the surface of the bent cap (1); wherein the main body (100) comprises:
the carbon fiber plate (2) is fixed on the side wall of the bent cap (1);
the fixing mechanism (4), the fixing mechanism (4) comprises a mounting plate (41), a second fixing bolt (42), a second screw (43), a base plate (44), a second fixing sleeve (45), a second pressing plate (46), a groove (47) and a limiting plate (48), the mounting plate (41) is fixed on the side wall of the bent cap (1) through the second fixing bolt (42), one end of the mounting plate (41) is provided with the base plate (44), and the side wall of the base plate (44) is abutted against the carbon fiber plate (2); the side wall edge of the mounting plate (41) is symmetrically and fixedly connected with the second screw rod (43), the side wall of the second screw rod (43) is in sliding connection with the second pressing plate (46), the second screw rod (43) is in threaded connection with the second fixing sleeve (45), and two ends of the second pressing plate (46) respectively abut against the second fixing sleeve (45) and the carbon fiber plate (2); the bottom end of the second pressing plate (46) is provided with the groove (47), the limiting plate (48) is obliquely arranged in the groove (47), and the limiting plate (48) is abutted against the side wall of the carbon fiber plate (2); the bottom surface of the second pressing plate (46) and the top surface of the backing plate (44) are of arc-shaped structures, and one end of the limiting plate (48) is aligned with the arc-shaped bulge of the backing plate (44)
The reinforcing mechanism (3) is fixed on the side wall of the bent cap (1), and the reinforcing mechanism (3) is abutted against the carbon fiber plate (2);
the mounting mechanism (5) is connected to the side wall of the bent cap (1); the mounting mechanism (5) comprises a support plate (51), a third fixing bolt (52) and a support beam (53), wherein the support plate (51) is fixed on the side wall of the bent cap (1) through the third fixing bolt (52), and the support beam (53) is mounted on the side wall of the support plate (51);
the extrusion mechanism (6) is arranged on the side wall of the mounting mechanism (5), and the extrusion mechanism (6) is connected with the side wall of the mounting plate (41); the extrusion mechanism (6) comprises a jack (61), a sliding sleeve (62) and a connecting beam (63), wherein the jack (61) is symmetrically arranged on the side wall of the supporting beam (53), and one end of the jack (61) is connected with the connecting beam (63); the side wall of one mounting plate (41) is symmetrically and fixedly connected with the connecting beam (63), and one end of the connecting beam (63) is fixedly connected with the sliding sleeve (62);
a traction mechanism (7), wherein the traction mechanism (7) is connected with the extrusion mechanism (6) and the installation mechanism (5); the traction mechanism (7) comprises a first connecting rod (71), a sliding chute (72), a guide rod (73), a second connecting rod (74), a fixed block (75), a hexagonal prism (76), an elastic sheet (77) and a bump (78), wherein the guide rod (73) is symmetrically arranged on the side wall of the supporting beam (53), and the side wall of the guide rod (73) is in sliding connection with the sliding sleeve (62); the side wall of the guide rod (73) is provided with the sliding groove (72), and a spherical fixed block (75) is arranged in the sliding groove (72); the side wall of the fixed block (75) is fixedly connected with the first connecting rod (71), the second connecting rod (74) and the hexagonal prism (76) are connected in a sliding manner in the first connecting rod (71), and two ends of the second connecting rod (74) are respectively and fixedly connected with the sliding sleeve (62) and the hexagonal prism (76); the side wall of the second connecting rod (74) is provided with the elastic sheet (77) at equal intervals, the inside of the first connecting rod (71) is provided with a plurality of protruding blocks (78), and the elastic sheet (77) is connected with the protruding blocks (78) in a sliding mode.
2. The construction process of the large-span crack-resistant bent cap according to claim 1, wherein the reinforcing mechanism (3) comprises a fixed plate (31), a first fixed bolt (32), a first screw (33), a first pressing plate (34), a first fixed sleeve (35) and a pressing block (36), the fixed plate (31) is fixed on the side wall of the bent cap (1) through the first fixed bolt (32), the first screw (33) is installed on the side wall of the fixed plate (31), and the side wall of the first screw (33) is connected with the first pressing plate (34) in a sliding manner; the side wall of the first screw rod (33) is in threaded connection with the first fixing sleeve (35), and two ends of the first pressing plate (34) respectively abut against the first fixing sleeve (35) and the carbon fiber plate (2); the bottom equidistance installation lateral wall of first clamp plate (34) is curved briquetting (36), just briquetting (36) conflict lateral wall of carbon fiber board (2).
3. Construction process of a long span crack-resistant bent cap according to claim 1, characterized in that the carbon fiber plate (2) is located between two support plates (51), and the support beam (53) and the carbon fiber plate (2) are perpendicular to each other.
4. The construction process of the long-span anti-crack capping beam according to claim 1, wherein the inner cross section of the first connecting rod (71) is hexagonal, and the first connecting rod (71) is slidably connected with the inside of the guide rod (73).
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