CN114753670A - Cracked wood beam repairing and FRP reinforcing device and method - Google Patents
Cracked wood beam repairing and FRP reinforcing device and method Download PDFInfo
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- CN114753670A CN114753670A CN202210480921.7A CN202210480921A CN114753670A CN 114753670 A CN114753670 A CN 114753670A CN 202210480921 A CN202210480921 A CN 202210480921A CN 114753670 A CN114753670 A CN 114753670A
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- 239000002023 wood Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 27
- 239000003822 epoxy resin Substances 0.000 claims abstract description 25
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 25
- 238000010008 shearing Methods 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- 230000007935 neutral effect Effects 0.000 claims description 16
- 230000002787 reinforcement Effects 0.000 claims description 11
- 210000003205 muscle Anatomy 0.000 claims description 8
- 230000008439 repair process Effects 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a device and a method for repairing a cracked wooden beam and reinforcing FRP (fiber reinforced plastic), which comprises a wooden beam, an embedded wooden strip, a ribbed FRP rib and filled epoxy resin, wherein the ribbed FRP rib is embedded into an X-shaped groove and an I-shaped groove through an adhesive, the embedded wooden strip is embedded into a crack groove through the adhesive, the epoxy resin is filled in a non-rib-embedded area of the X-shaped groove and a crack gap, and after curing until the bonding is firm, the ribbed FRP rib and the filled epoxy resin form an X-shaped crack to limit the crack to open and form a whole with the embedded wooden strip. The reinforcing method adopted by the invention does not obviously change the appearance of the wood beam, and realizes the aims and effects of repairing the crack and synchronously improving the shearing resistance of the cracked wood beam on the premise of meeting the reinforcing principle of 'repairing the old as the old' of the wooden structure of the ancient building.
Description
Technical Field
The invention relates to the technical field of historic building timber structure repair and reinforcement, in particular to a device and a method for repairing a cracked timber beam and reinforcing FRP (fiber reinforced plastic).
Background
Due to the influence of the natural environment and the defects of wood, the wooden members in the historic building timber structure usually have the damage conditions of decay, dry cracking and the like. Among them, the dry shrinkage cracks caused by the change of the water content are common, which significantly reduces the bending and shearing resistance of the wood beam. Usually, a slight crack has no obvious influence on the wood beam, but even if the crack is very small, the dry shrinkage crack on the wood beam can gradually expand, and the bearing capacity of the wood beam is further influenced. As an important bearing component, the wood beam needs to be repaired and reinforced in order to ensure the safe use of the wooden structure of the historic building. Slight cracks on the wood beam are generally filled by the embedded wood strips to achieve the purpose of repairing the surface, even if the surface is repaired, certain risks still exist, the internal cracks can continue to expand under the condition that the cracks cannot be detected, and finally the safety of the wood beam and the wood structure is seriously damaged. When the crack is deep (such as the crack depth exceeds 1/3 of the beam width), the crack reduces the connection range of the cross section of the wood beam, reduces the shear bearing capacity of the wood beam along the grain, easily leads the cracked wood beam to be gradually divided into superposed beams when the cracked wood beam is bent because the horizontal shear stress of the plane where the crack is located is greater than the shear bearing capacity of the section, and greatly reduces the bearing capacity. Therefore, when the wood beam cracks seriously, besides filling the crack, the crack needs to be limited from expanding, and the shearing resistance of the cracked wood beam needs to be reinforced.
Common reinforcement methods for cracked wood beams are as follows: steel hoop method, steel plate sticking method, external support method, bar planting method in beam, bolt anchoring method, etc. The above reinforcing method generally uses steel as a material, and has problems of self-weight, large volume, difficult installation, easy rusting and the like, and is not a preferable scheme for reinforcing the cracked wood beam in the long term.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for repairing a cracked wood beam and reinforcing FRP (fiber reinforced Plastic), which solve the technical defects in the field of reinforcing the cracked wood beam, such as the technical problems of easy aging, corrosion, large volume and the like of steel members. The reinforcing method adopted by the invention does not obviously change the appearance of the wood beam, and realizes the aims and effects of repairing the crack and synchronously improving the shearing resistance of the cracked wood beam on the premise of meeting the reinforcing principle of 'repairing the old as the old' of the wooden structure of the ancient building.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a fracture timber beams is restoreed and FRP reinforcing apparatus, including timber beams 1, inlay solid stuff 2, ribbed FRP muscle 3, fill epoxy 4, ribbed FRP muscle 3 passes through adhesive embedding X shape slot 12 and I type slot 13, it imbeds crack slot 11 to inlay solid stuff 2 through the adhesive, do not inlay muscle region and crack space at X shape slot 12 and fill epoxy 4, the maintenance is to gluing firm back, ribbed FRP muscle 3 and fill epoxy 4 and form X shape restriction crack and open, and form wholly with embedding solid stuff 2.
The crack groove 11 is a rectangular cross-section groove obtained by trimming the crack of the wood beam 1, the depth of the groove is the same as the deepest part of the crack, the width of the groove is the same as the widest part of the crack, the length of the groove is the same as the length of the crack, the shapes of the cracks of the wood beam 1 are different, and when the groove is trimmed, a plurality of adjacent cracks on the same plane are trimmed into one groove.
The processing of the X-shaped groove 12 covers the crack groove 11, the X-shaped groove is located in a bending shear area on the inner side of a support of the wood beam 1, the X-shaped groove is formed by two grooves with rectangular cross sections, the included angle between the X-shaped groove and the crack is 60 degrees, a ribbed FRP rib 3 is required to be embedded in the X-shaped groove 12 near a neutral axis for shearing and reinforcing the wood beam, the X-shaped groove 12 near the neutral axis is required to be uniformly and symmetrically distributed at two ends of the wood beam as far as possible, the distance does not have special requirements, the vertical height is not less than 1/3 beam height, the depth is consistent with that of the crack groove 11, the groove width does not have special requirements, the X-shaped groove 12 near a non-neutral axis is not used for embedding ribs, the shape is set to be X-shaped, no special size requirements are required, and the size of the groove is properly increased at a position with a large crack.
The processing of the I-shaped groove 13 and the processing of the X-shaped groove 12 are simultaneously carried out, the I-shaped groove is positioned at a neutral axis outside the wood beam support, the direction of the I-shaped groove is vertical to the axis of the wood beam, the vertical height of the I-shaped groove is not less than 1/3 of the beam, the depth of the I-shaped groove is consistent with that of the crack groove 11, the width of the I-shaped groove does not have special requirements, and the ribbed FRP rib 3 is not required to be embedded inside the I-shaped groove.
The embedded wood strips 2 are made of wood which is the same as that of the reinforced target wood beam 1, and are cut from defect-free positions of wood with similar wood grains and similar colors, and the length, the width and the depth of the embedded wood strips 2 are slightly smaller than those of the crack grooves 11 to be embedded according to the specific size of the crack grooves 11.
The ribbed FRP rib 3 is formed by mixing one or more of Carbon Fiber (CFRP), Glass Fiber (GFRP), Aramid Fiber (AFRP) and Basalt Fiber (BFRP), is used for improving the shearing resistance of a cracked wood beam, has a diameter which is not less than 5mm according to the size of the wood beam, and has a length which is determined according to the X-shaped groove 12.
The ribbed FRP ribs 3 are embedded into the X-shaped grooves 12 to form two grooves of the X-shaped grooves 12, if the depth of the grooves is limited, or materials are saved, the ribbed FRP ribs 3 can be embedded into the grooves on one side only by using structural glue, the devices with the ribbed FRP ribs and the epoxy resin 4 can be filled on the other side to form an X shape, if the depth of the grooves is enough, the ribbed FRP ribs 3 can be embedded into the grooves to form the X-shaped devices to further improve the shearing resistance of the wood beam, the X-shaped structural devices formed by the epoxy resin 4 and the ribbed FRP ribs can pull and integrate the two sides of the cracks into a whole to limit the continuous expansion and the expansion of FRP, and meanwhile, the embedded ribs can enhance the shearing resistance of the crack parts of the wood beam.
The ribbed FRP ribs 3 are embedded into the I-shaped grooves 13 and are firmly bonded by using a structural adhesive, so that the shear dislocation along the grains of the end part of the cracked wood beam is limited, and the crack is further expanded.
A method for installing a device for repairing a cracked wood beam and reinforcing FRP (fiber reinforced Plastic) comprises the following steps;
a) measuring and determining the depth, width and trend of the crack of the wood beam 1 by adopting nondestructive or micro-damage methods such as a resistance meter, a measuring scale and a probe;
b) for non-fine cracks (the crack width is larger than 5mm), trimming the cracks of the wood beam into crack grooves 11 with rectangular sections by using tools such as cutting blades and chisels, and repairing the embedded wood strips, wherein the groove width is consistent with the maximum width of the cracks, and the groove depth is consistent with the crack depth; repairing the small cracks by filling epoxy resin 4, processing the inner surface of each crack smoothly by using a tool, and cleaning up impurities such as wood chips and the like by using a brush, a dust collector or air flow;
c) the method comprises the following steps of sequentially arranging X-shaped grooves 12 on crack grooves 11, wherein the depth of each X-shaped groove 12 is consistent with the depth of each crack groove, the X-shaped grooves 12 cover the crack grooves 11, a bent shearing area located on the inner side of a wood beam support is formed by two grooves with rectangular cross sections, the included angle between each X-shaped groove and the crack is 60 degrees, the X-shaped grooves 12 near a neutral axis are uniformly and symmetrically distributed at two ends of a wood beam as much as possible, the distance has no special requirement, the vertical height is not less than 1/3 beam height, the depth of each X-shaped groove is consistent with that of the crack grooves 11, the width of each groove has no special requirement, the X-shaped grooves near the non-neutral axis are not used for embedding ribs, the shape is set to be X-shaped, and impurities in the grooves are cleaned after the operation is finished;
d) Processing the embedded wood strips 2 according to the size of the crack grooves, intercepting the wood which is the same as the reinforced target wood beam 1 from the defect-free position of the wood with similar wood grain and color, wherein the length, width and depth of the embedded wood strips 2 are slightly smaller than those of the crack grooves 11 to be embedded according to the specific size of the crack grooves 11, and sticking adhesive tapes on the edges of the grooves and other crack openings of the wood beam 1 to prevent glue from polluting the beam body during filling;
e) injecting a proper amount of structural adhesive into the grooves, embedding the embedded battens 2 into the crack grooves 11 for crack repair, embedding the ribbed bars into the X-shaped grooves 12 and the I-shaped grooves 13 for shear reinforcement, blending the color of the epoxy resin for filling until the color is consistent with that of the wood beam, injecting the epoxy resin 4 for filling into the rest grooves without embedded ribs and tiny cracks, scraping the surface of the wood beam after the cracks are filled with the epoxy resin 4, standing the wood beam 1 until the bonding is firm, and cleaning the surface of the wood beam 1.
The invention has the beneficial effects that:
a) the method repairs the cracks on the cracked wood beam into regular crack grooves 11, and then repairs the cracks by using the embedded wood bars 2, so that firm bonding and complete structure are ensured, and the original appearance of the wood beam can be restored to the maximum extent while the cracks are repaired;
b) the ribbed FRP rib 3 is used as a fiber reinforced material, has the characteristics of wide application in recent years, light weight, high strength, corrosion resistance and the like, overcomes the defect that the traditional reinforced material such as steel is easy to corrode, enhances the anchoring capability of the ribbed FRP rib 3 in the wood beam by the rib, and improves the capability of limiting the crack propagation of the wood beam to a certain extent;
c) According to the method, the X-shaped groove 12 is utilized to enable the ribbed FRP ribs 3 and epoxy resin to form an X-shaped structure, and the embedded ribbed FRP ribs 3 enhance the shearing resistance of the wood beam while repairing cracks and limiting the cracks from further expanding.
Drawings
FIG. 1 is a flow chart of a device and a method for repairing a cracked wood beam and reinforcing FRP.
FIG. 2 is a schematic view of a crack repairing and FRP reinforcing device and method for repairing a cracked wood beam and repairing a crack in a groove.
FIG. 3 is a schematic diagram of a device and method for repairing a cracked wood beam and reinforcing FRP, and for machining an X-shaped groove.
FIG. 4 is a top perspective view of a cracked wood beam repair and FRP reinforcement apparatus and method.
FIG. 5 is a front view of a device and method for repairing cracked wood beams and reinforcing FRP.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-5, a device and a method for repairing and FRP reinforcing a cracked wooden beam include a wooden beam 1, an embedded wooden bar 2, a ribbed FRP bar 3, and a filled epoxy resin 4, wherein the ribbed FRP bar 3 is embedded into an X-shaped groove 12 and an I-shaped groove 13 through an adhesive, the embedded wooden bar 2 is embedded into a crack groove 11 through the adhesive, the epoxy resin 4 is filled in a non-embedded bar area and a crack gap of the X-shaped groove 12, and after curing until the bonding is firm, the ribbed FRP bar 3 and the filled epoxy resin 4 form an X shape to limit the crack from opening and form a whole with the embedded wooden bar 2.
The crack groove 11 is a rectangular cross-section groove obtained by trimming a crack of a wood beam, the depth of the groove is consistent with the deepest part of the crack, the width of the groove is the same as the widest part of the crack, and the length of the groove is consistent with the length of the crack. The wood beam has different crack shapes, and when the groove is trimmed, a plurality of adjacent cracks on the same plane are trimmed into one groove.
The processing of the X-shaped groove 12 covers the crack groove 11, the bent shearing area positioned on the inner side of the wood beam support is formed by two grooves with rectangular cross sections into an X shape, and the included angle between the grooves and the crack is 60 degrees. The ribbed FRP ribs 3 are required to be embedded in the X-shaped grooves 12 near the neutral axis for shearing reinforcement of the wood beam, the FRP ribs are required to be uniformly and symmetrically distributed at two ends of the wood beam as far as possible, the distance does not have special requirements, the vertical height is not less than 1/3 beam height, the depth is consistent with that of the crack grooves 11, and the width of the grooves does not have special requirements. The X-shaped groove near the non-neutral axis is not used for embedding the rib, the shape is set to be X-shaped, no special size requirement exists, and the size of the groove is properly increased at the position with larger cracks.
The processing of the I-shaped groove 13 and the processing of the X-shaped groove 12 are simultaneously carried out, the I-shaped groove is positioned at a neutral axis outside the wood beam support, the direction of the I-shaped groove is vertical to the axis of the wood beam, the vertical height of the I-shaped groove is not less than 1/3 of the beam, the depth of the I-shaped groove is consistent with that of the crack groove 11, the width of the I-shaped groove does not have special requirements, and the ribbed FRP rib 3 is not required to be embedded inside the I-shaped groove.
The embedded wood strips 2 are made of wood which is the same as that of the reinforced target wood beam 1, and are cut from defect-free positions of wood with similar wood grains and similar colors, and the length, the width and the depth of the embedded wood strips 2 are slightly smaller than those of the crack grooves 11 to be embedded according to the specific size of the crack grooves 11.
The ribbed FRP rib 3 is formed by mixing one or more of Carbon Fiber (CFRP), Glass Fiber (GFRP), Aramid Fiber (AFRP) and Basalt Fiber (BFRP), is used for improving the shearing resistance of a cracked wood beam, has a diameter which is not less than 5mm according to the size of the wood beam, and has a length which is determined according to the X-shaped groove 12.
The ribbed FRP ribs 3 are embedded into the X-shaped grooves 12 to form two grooves of the X-shaped grooves 12, if the depth of the grooves is limited, or materials are saved, the ribbed FRP ribs 3 can be embedded into the grooves on one side only by using structural adhesive, the epoxy resin 4 and the ribbed FRP ribs are filled on the other side to form an X-shaped device, and if the depth of the grooves is enough, the ribbed FRP ribs 3 can be embedded into the two grooves to form the X-shaped device so as to further improve the shearing resistance of the wood beam. The X-shaped structure device formed by the epoxy resin and the ribbed FRP ribs can tie two sides of a crack into a whole, limit the crack from continuously expanding and stretching, and simultaneously embed and fix the FRP ribs to enhance the shear resistance of the crack of the wood beam.
The ribbed FRP ribs 3 are embedded into the I-shaped grooves 13 and are firmly bonded by using a structural adhesive, so that the shear dislocation along the grains of the end part of the cracked wood beam is limited, and the crack is further expanded.
A device and a method for repairing a cracked wood beam and reinforcing FRP (fiber reinforced Plastic) comprise the following steps;
a) measuring and determining the depth, width and trend of the crack of the wood beam 1 by adopting nondestructive or micro-damage methods such as a resistance meter, a measuring scale and a probe;
b) for non-fine cracks (the crack width is larger than 5mm), trimming the cracks of the wood beam into crack grooves 11 with rectangular sections by using tools such as cutting blades and chisels, and repairing the embedded wood strips, wherein the groove width is consistent with the maximum width of the cracks, and the groove depth is consistent with the crack depth; repairing the tiny cracks by filling epoxy resin, treating the inner surface of each crack smoothly by using a tool, and cleaning up impurities such as wood chips and the like by using a brush, a dust collector or air flow;
c) the crack groove 11 is sequentially provided with X-shaped grooves 12, the depth of the X-shaped grooves is consistent with the depth of the crack groove, the crack groove is characterized in that the X-shaped grooves 12 cover the crack groove 11, a bent shearing area positioned on the inner side of a wood beam support is formed by two grooves with rectangular cross sections, the X-shaped grooves form an X shape, the included angle between the X-shaped grooves and the crack is 60 degrees, the X-shaped grooves 12 near a neutral axis are uniformly and symmetrically distributed at two ends of the wood beam as much as possible, the distance has no special requirement, the vertical height is not less than 1/3 beam height, the depth is consistent with the crack groove 11, the groove width has no special requirement, the X-shaped grooves near the non-neutral axis are not used for embedding ribs, the shape is set to be X-shaped, and impurities in the groove are cleaned after the process is finished;
d) Processing the embedded battens 2 according to the size of the crack grooves, and is characterized in that the embedded battens 2 are made of wood which is the same as that of the reinforced target wood beam 1 and cut from the defect-free part of wood with similar wood grains and color, the length, width and depth of the embedded battens 2 are slightly smaller than those of the crack grooves 11 to be embedded according to the specific size of the crack grooves 11, and adhesive tapes are stuck to the edges of the grooves and other crack openings of the wood beam 1 to prevent glue from polluting the beam body during filling;
e) injecting a proper amount of structural adhesive into the grooves, embedding the embedded battens 2 into the crack grooves 11 for crack repair, embedding the ribbed bars into the X-shaped grooves 12 and the I-shaped grooves 13 for shear reinforcement, blending the color of the epoxy resin for filling until the color is consistent with that of the wood beam, injecting the epoxy resin for filling into the rest grooves without embedded ribs and tiny cracks, scraping the surface of the wood beam after the cracks are filled with the resin, standing the wood beam 1 until the bonding is firm, and cleaning the surface of the wood beam 1.
Claims (9)
1. The utility model provides a fracture timber beams is restoreed and FRP reinforcing apparatus, a serial communication port, including timber beams (1), inlay solid stuff (2), ribbed FRP muscle (3), fill epoxy (4), ribbed FRP muscle (3) pass through adhesive embedding X shape slot (12) and I type slot (13), it imbeds crack slot (11) to inlay solid stuff (2) through the adhesive, do not inlay muscle region and crack space at X shape slot (12) and fill epoxy (4), maintenance is to the firm back of cementation, ribbed FRP muscle (3) and fill epoxy (4) and form X shape restriction crack and open, and form wholly with the solid stuff (2).
2. The device for repairing cracked wood beam and FRP reinforcement as claimed in claim 1, wherein the cracked grooves (11) are rectangular cross-section grooves obtained by trimming cracks of the wood beam (1), the depth of the cracked grooves is consistent with the deepest part of the crack, the width of the cracked grooves is the same as the widest part of the crack, the length of the cracked grooves is consistent with the length of the crack, the shapes of the cracks of the wood beam (1) are different, and when the cracked grooves are trimmed, a plurality of adjacent cracks on the same plane are trimmed into one groove.
3. The device for repairing the cracked wood beam and strengthening the FRP as claimed in claim 1, wherein the X-shaped groove (12) is processed to cover the cracked groove (11), the curved shearing area is located at the inner side of the support of the wood beam (1), the X-shaped groove is formed by two grooves with rectangular cross sections, the included angle between the groove and the crack is 60 degrees, ribbed FRP ribs (3) are required to be embedded in the X-shaped groove (12) near the neutral axis for wood beam shearing resistance and reinforcement, the ribbed FRP ribs are required to be uniformly and symmetrically distributed at two ends of the wood beam as far as possible, the distance is not required, the vertical height is not less than 1/3 beam height, the depth is consistent with that of the cracked groove (11), the groove width is not required, the X-shaped groove (12) near the non-neutral axis is not required to be embedded with ribs, the shape is set to be X-shaped, no special size is required, and the size of the groove is properly increased at the position with larger crack.
4. The device for repairing the cracked wood beam and strengthening the FRP as claimed in claim 1, wherein the I-shaped groove (13) and the X-shaped groove (12) are processed simultaneously, the I-shaped groove is located at the neutral axis outside the wood beam support, the direction of the I-shaped groove is perpendicular to the axis of the wood beam, the vertical height of the I-shaped groove is not less than 1/3 beam height, the depth of the I-shaped groove is consistent with that of the cracked groove (11), the width of the I-shaped groove does not need special requirements, and the FRP rib 3 with ribs is embedded inside the I-shaped groove.
5. The device for repairing cracked wood beams and FRP reinforcement as claimed in claim 1, wherein the embedded battens (2) are made of the same wood as the reinforcement target timber beam (1) and are cut from the defect-free parts of the wood with similar wood grain and color, and the length, width and depth of the embedded battens (2) are slightly smaller than the crack grooves (11) to be embedded according to the specific size of the crack grooves (11).
6. The device for repairing and FRP reinforcing cracked wood beam as claimed in claim 1, wherein the ribbed FRP rib (3) is one or a mixture of Carbon Fiber (CFRP), Glass Fiber (GFRP), Aramid Fiber (AFRP) and Basalt Fiber (BFRP), is ribbed FRP rib for improving the shear resistance of cracked wood beam, and has a diameter which is not less than 5mm according to the size of the wood beam and a length which is determined according to the X-shaped groove (12).
7. The device for repairing and FRP reinforcing of cracked wooden beam as claimed in claim 1, wherein the ribbed FRP bars (3) are embedded into the X-shaped grooves (12), if the depth of the grooves is limited, or the material is saved, the ribbed FRP bars (3) can be embedded into the grooves on only one side by using structural adhesive, the other side is filled with epoxy resin (4) to form an X-shaped device with the ribbed FRP bars, if the depth of the grooves is enough, the ribbed FRP bars (3) can be embedded into both grooves to form an X-shaped device to further improve the shear resistance of the wooden beam, and the above X-shaped structural device formed by the epoxy resin (4) and the ribbed FRP bars can tie the two sides of the crack into a whole.
8. A cracked wood beam repairing and FRP reinforcing apparatus as claimed in claim 1, wherein the ribbed FRP ribs (3) are embedded in the I-shaped grooves (13) and bonded firmly by structural adhesive to limit the shear dislocation along the grain and the further propagation of the crack at the end of the cracked wood beam.
9. The method for installing the device for repairing the cracked wood beam and FRP reinforcing on the basis of any one of claims 1 to 8 is characterized by comprising the following steps;
a) measuring and determining the crack depth, width and trend of the wood beam (1) by adopting nondestructive or micro-damage methods such as a resistance meter or a measuring scale, a probe and the like;
b) For non-fine cracks (the crack width is larger than 5mm), trimming the cracks of the wood beam into crack grooves (11) with rectangular sections by using tools such as cutting blades and chisels, and repairing the embedded wood strips, wherein the groove width is consistent with the maximum width of the cracks, and the groove depth is consistent with the crack depth; repairing the tiny cracks by filling epoxy resin (4), processing the inner surface of each crack smoothly by using a tool, and cleaning up impurities such as wood chips and the like by using a brush, a dust collector or air flow;
c) the method is characterized in that X-shaped grooves (12) are sequentially formed in the crack grooves (11), the depth of each X-shaped groove is consistent with that of each crack groove, the X-shaped grooves (12) cover the crack grooves (11), a bent shearing area is located on the inner side of a wood beam support, the X-shaped grooves are formed by two rectangular cross-section grooves, the included angle between each X-shaped groove and each crack is 60 degrees, the X-shaped grooves (12) near a neutral axis are uniformly and symmetrically distributed at the two ends of the wood beam as far as possible, the distance does not have special requirements, the vertical height is not smaller than 1/3 beam height, the depth of each X-shaped groove is consistent with that of each crack groove (11), the width of each groove does not have special requirements, the X-shaped grooves near the neutral axis are not used for embedding ribs, the shape is set to be X-shaped, and sundries in the grooves are cleaned after the X-shaped grooves are finished;
d) processing the embedded battens (2) according to the size of the crack groove, intercepting the same wood as the reinforcing target wood beam (1) from the defect-free position of the wood with similar wood grain and color, slightly reducing the length, width and depth of the embedded battens (2) to be smaller than the crack groove (11) to be embedded according to the specific size of the crack groove (11), and sticking adhesive tapes on the edges of the groove and other crack openings of the wood beam (1) to prevent glue from polluting the beam body during filling;
e) Injecting a proper amount of structural adhesive into the groove, embedding the embedded battens (2) into the crack groove (11) for crack repair, embedding the ribbed rib bodies into the X-shaped groove (12) and the I-shaped groove (13) for shear reinforcement, blending the color of the epoxy resin for filling until the color of the epoxy resin is consistent with that of the wood beam, injecting the epoxy resin (4) for filling into the residual grooves without embedded ribs and the tiny cracks, scraping the surface of the wood beam after the cracks are filled with the epoxy resin (4), standing the wood beam (1) until the bonding is firm, and cleaning the surface of the wood beam (1).
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| CN214740155U (en) * | 2021-03-24 | 2021-11-16 | 贺州学院 | A reinforcing apparatus for traditional building wooden member crackle |
| US20220042333A1 (en) * | 2019-02-01 | 2022-02-10 | S&P Clever Reinforcement Company Ag | Method for strengthening concrete or timber structures using cfrp strips and concrete or timber structures strengthened by this method |
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| CN101922241A (en) * | 2010-08-13 | 2010-12-22 | 成都建筑工程集团总公司 | Method for repairing wood beam column of old building by embedded rib reinforcement |
| CN202000685U (en) * | 2010-08-13 | 2011-10-05 | 成都建筑工程集团总公司 | Historic building wooden beams and columns reinforced through embedded ribs |
| CN102587687A (en) * | 2012-03-08 | 2012-07-18 | 上海大学 | Cross-shaped anchoring method for ends of reinforcing beams of composite embedded fiber plates |
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