CN111425005A - Method for connecting end parts of wooden beams on clear water surface of historic building in pier mode - Google Patents
Method for connecting end parts of wooden beams on clear water surface of historic building in pier mode Download PDFInfo
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- CN111425005A CN111425005A CN202010290346.5A CN202010290346A CN111425005A CN 111425005 A CN111425005 A CN 111425005A CN 202010290346 A CN202010290346 A CN 202010290346A CN 111425005 A CN111425005 A CN 111425005A
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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
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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
- E04G2023/0248—Increasing or restoring the load-bearing capacity of building construction elements of elements made of wood
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Abstract
The invention provides a method for connecting end parts of wooden beams on the clear water surface of an ancient building in a pier mode, which comprises the following specific steps: preparing colloid: selecting a bonding material; preprocessing a log beam; cutting decay ends; selecting a joggled new wood beam; the bottom is longitudinally grooved; splicing; embedding a fiber pultrusion composite material; and (6) surface treatment. The pier-connected back beam structure is more stable, and the limiting tenon can prevent the lap joint part from moving up and down; the fiber pultrusion composite material embedded in the beam bottom can improve the cooperative working effect of the new and old beams and improve the bearing capacity of the tensile region of the beam member; the reinforcing positions of the countersunk head bolts are arranged on the two sides of the groove, and the pier joint surfaces are spliced more firmly by limiting bonding and sliding. Meanwhile, the fiber pultrusion composite material has excellent mechanical property, has the advantages of high strength and high ductility, is simple and feasible in embedding and reinforcing mode, meets the requirements of green, environment-friendly and energy-saving construction, does not influence appearance and appearance, and meets the requirements of authenticity and integrity in the principle of cultural relic repair to achieve the purpose of repairing the cultural relics as old as the causes.
Description
Technical Field
The invention belongs to the technical field of historic building protection construction, and particularly relates to a method for connecting end parts of wooden beams of a fresh water surface of a historic building in a pier mode.
Background
The wooden beam plays an important role in bearing upper load in the wooden building, and is one of the most important and most vulnerable structural members. The wood beam end is usually inserted into a wood column or placed on a brick wall by adopting a tenon, and is extremely easy to decay due to long-term dry-wet alternation, so that the bearing capacity of the whole wooden framework is influenced, the existing repairing method is mainly to replace the whole wood beam or externally paste a high yield ratio material (such as externally pasted fiber cloth) for reinforcement, the component replacement mode has great influence on the appearance and value of the historical relic heritage, and the principles of 'minimum intervention' and 'maximum preservation of the historical relic original part' of the immovable historical relic in the historical relic protection law are violated; in the existing pier connection and repair technology for reserving the original wood beam, the limiting function of the mortise and tenon opening is simpler, and the adverse effects that the pier connection surface is easy to generate vertical dislocation, left and right slippage and the like under the bending and tension actions of the beam are neglected; the carbon fiber cloth is pasted outside the surface of the beam component to enhance the cooperative working performance of the new and old beams, the composite material is only suitable for reinforcing the wood component on the water-mixed paint surface and is not suitable for reinforcing the wood component on the clear water surface, and the FRP material is exposed on the surface of the component and is easy to damage FRP and a binding agent under the action of external force, so that the reinforcing quality is influenced, the appearance and the appearance of the traditional building can be greatly influenced, and the 'authenticity' and 'integrity' principles of the traditional wood construction and repair are violated. In conclusion, when repairing and protecting the important wooden beam end decay of the wooden structure building heritage, a more reasonable repairing method is needed to ensure the overall safety and the historical trueness.
Disclosure of Invention
The technical problem is as follows: aiming at the problems in the background technology, the invention provides the method for the end part of the wooden beam of the clear water surface of the historic building, which is more standard and controllable in the wooden beam pier connection construction process, better in safety performance and stronger in structural integral stability. The structure of the invention is more stable, and the limiting tenon can prevent the lap joint part from moving up and down; the fiber pultrusion composite material embedded in the beam bottom can improve the cooperative working effect of the new and old beams and improve the bearing capacity of the tensile region of the beam member; the reinforcing position of countersunk bolt sets up in the recess both sides, and it is more firm to make the concatenation of mound face through the restriction slides from side to side. Meanwhile, the fiber pultrusion composite material has the advantages of excellent mechanical property, high strength and high ductility, the embedding and reinforcing mode is simple and easy to implement, the requirements of green, environment-friendly and energy-saving construction are met, the appearance and the appearance are not influenced, the requirements of authenticity and integrity in the cultural relic repair principle are met, and the effect of repairing the cultural relics as before is achieved.
The technical scheme is as follows: the invention discloses a method for connecting end parts of wooden beams on the clear water surface of an ancient building in a pier mode, which comprises the following steps:
a) preparing colloid: selecting epoxy resin (8) which is beneficial to construction as a bonding colloid material;
b) pretreating the log beam (1): polishing the convex part on the surface of the log beam (1) to be flat, removing the corroded surface layer, then removing broken slag in the crack by using a steel wire brush and removing moth by using compressed air, and filling the crack by using epoxy resin (8); measuring the length of a rotten part of the log beam (1) as S1, and the diameter of the log beam (1) as D;
c) and (3) cutting rotten ends: performing full circle cutting with the diameter of D at the lower cross section (A) of the length of S1+5cm at the decay end of the log beam (1), wherein a square log beam tenon (4) with the side length of D/4 is reserved towards the decay end of the cross section A, and the tenon (4) is D/3 long; cutting a semicircle with the diameter of D at an upper cross section (B) with the length of' max { S1,40cm } in the direction of the cross section A far away from the decay end, wherein the cutting length is the length between a lower cross section (A) and the upper cross section (B), but a square log beam mortise (2) with the side length of D/4 needs to be reserved towards the far decay end of the upper cross section (B), and the length of the mortise (2) is D/3; after the cutting is finished, the saw dust is cleaned, and the cut is polished;
d) selecting a joggled new wood beam (3): selecting new wood which is consistent with the variety of the original wood beam (1), has the same diameter, has the moisture content of less than 20 percent in the drying degree and cannot crack; preparing a new wood beam (3) according to the tenon (4) and the mortise (2) reserved in the original wood beam (1);
e) longitudinally slotting the bottom: recording the height or the diameter of the fiber pultrusion composite material (9) as h, and chiseling a through long groove (5) in the length direction of the beam at the bottom of the original wood beam (1) and the center of the bottom of the new wood beam (3); carefully cleaning the wood chips in the groove;
f) splicing: splicing an original wood beam (1) and a new wood beam (3) according to a mortise (4) and a mortise (2), smearing epoxy resin (8) at a spliced part, respectively recording two trisection sections between a lower cross section (A) and an upper cross section (B) as a first section (C1) and a second section (C2), chiseling holes (6) at 0.3D positions on the two sides of a central axis perpendicular to a splicing surface in the length direction on the first section (C1) and the second section (C2), penetrating the holes (6) through the original wood beam (1) and the new wood beam (3), manufacturing countersunk bolts (7) according to the hole diameters, filling the holes with wood chip cement after injecting the epoxy resin (8), and planing a pier joint by using a woodworking planer tool;
g) fibre-embedded pultruded composite (9): injecting epoxy resin (8) with half groove height into the reserved groove (5), then placing a fiber pultrusion composite material (9) with the same length as the beam, extruding to enable the fiber pultrusion composite material to be fully contacted with the epoxy resin (8), and then filling the epoxy resin (8) in the reserved groove (5) to be 0.5cm away from the bottom surface of the beam;
h) surface treatment: after the epoxy resin (8) is cured, filling the reserved groove (5) with wood chip cement until the reserved groove is flush with the bottom surface of the beam, and polishing and cleaning the surface after the wood chip cement is cured; the overflowing epoxy resin was wiped off with a spatula.
In the preparation of the epoxy resin (8), a low-speed stirring electric drill is used for stirring during stirring, so that the colloid is prevented from being stirred too fast to generate bubbles in the colloid, and the high thixotropy is required.
And b), filling the crack with epoxy resin (8), and filling the epoxy resin (8) colloid filling the crack with a pressure glue injection mode.
The width of the groove (5) is 1.4 cm-1.6 cm, and the depth is h +2cm to h +3 cm.
The fiber pultrusion composite material (9) is a carbon fiber plate or a carbon fiber rib.
The sawdust cleaning mode in the step e) is air compressor cleaning.
The aperture of the hole (6) is 12 mm-15 mm.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects:
1. the construction is safe and convenient, the method and the flow are scientific in design, the comprehensive cost is low, and the construction period is short;
the epoxy resin which is beneficial to construction and has high thixotropy is selected as the bonding material, and in the actual engineering, the epoxy resin with high thixotropy is easy to fill into the groove and is difficult to drip, so that constructors are protected; on the other hand, the construction of the embedded CFRP plate/rib reinforcing method is simpler, large-scale machinery, a large amount of labor force and larger space are not needed, and the construction can be carried out even under the condition that the normal use is not influenced.
2. The safety performance of the component is better, and the structural integrity is stronger;
the method ensures that the wood beam component is more stable, and the limiting tenon can prevent the lap joint part from moving up and down; the pier joint surface structure glue provides tensile bearing capacity and shearing resistance bearing capacity between new and old materials; the fiber pultrusion composite material embedded in the beam bottom can improve the bearing capacity of a tensile region of the beam member; the reinforcing positions of the countersunk head bolts are arranged on the two sides of the groove, so that the splicing of the pier joint surfaces is firmer, and the generation of the bonding slippage phenomenon is prevented.
3. The principle of 'authenticity' and 'completeness' of cultural relic repair and protection is met;
according to the method for connecting the end parts of the wooden beams on the clear water surface of the historic building in the pier mode, the new wooden beam and the old wooden beam are connected through the countersunk head bolt, and the outer surface layer of the countersunk head bolt hole is filled with sawdust daub; the wood beam is reinforced by the embedded CFRP plate/rib, and the surface of the groove is filled by the sawdust daub, after the repair is finished, the appearance of the wood beam is almost consistent with that of the original beam, the reinforcing effect of the fiber composite material is fully exerted, meanwhile, the construction mode of hidden repair is adopted, and the principle requirements of 'authenticity' and 'integrity' in the cultural relic protection law are met.
Drawings
In order to more clearly illustrate the technical solutions and embodiments of the present invention, the drawings used in the description of the technical solutions and embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a longitudinal sectional view of the wood beam end-portion-abutting apparatus of the present invention.
Fig. 2 is a cross-sectional view (carbon fiber plate) of 1-1 of the end-abutting apparatus of the wood beam of the present invention.
Fig. 3 is a cross-sectional view (carbon fiber bar) of 1-1 of the timber beam end abutting apparatus of the present invention.
Fig. 4 is a cross-sectional view 2-2 of the timber beam end abutment of the present invention.
Fig. 5 is a cross-sectional view of 3-3 of the timber beam end abutment of the present invention.
List of reference numerals:
1-original wood beam, 2-mortise opening, 3-new wood beam, 4-tenon, 5-groove, 6-hole, 7-countersunk bolt, 8-epoxy resin and 9-fiber pultrusion composite material.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
Examples
As shown in the figure, when the end part of the clear water surface girder of the wooden structure of an ancient building is rotten and needs pier connection and repair construction, the construction is carried out by adopting the technology disclosed by the invention.
(1) Preparing colloid: selecting epoxy resin 8 which is beneficial to construction and has high thixotropy as a bonding material, and stirring the colloid by using a low-speed stirring electric drill to prevent the colloid from being stirred too fast to generate bubbles in the colloid;
(2) pretreatment of the log beam 1: polishing the convex part on the surface of the original wood beam 1 to be flat, removing the corroded surface layer, then removing broken slag in the crack by using a steel wire brush, removing moth by using compressed air, and filling the crack by using epoxy resin 8 by using pressure glue injection; measuring the length of the rotten part of the log beam 1 as S1, and the diameter of the log beam 1 as D;
(3) and (3) cutting rotten ends: performing full circle cutting with the diameter of D at the cross section A of the length of S1+5cm at the decay end of the log beam 1, but reserving a square log beam tenon 4 with the side length of D/4 towards the decay end of the cross section A, wherein the tenon 4 is D/3 long; cutting a semicircle with the diameter of D at a cross section B with the length of' max { S1,40cm } in the direction of the cross section A far away from the decay end, wherein the cutting length is the length between the cross section A and the cross section B, but a square log beam mortise 2 with the side length of D/4 is reserved towards the cross section B far away from the decay end, and the mortise 2 is D/3 long; after the cutting is finished, the saw dust is cleaned, and the cut is polished;
(3) selecting a joggled new wood beam 3: selecting new wood which is consistent with the variety of the log beam 1, has the same diameter, and has better drying degree (the water content is less than 20%) and can not crack; preparing a new beam 3 according to the tenon 4 and the mortise 2 reserved on the original wood beam 1;
(4) longitudinally slotting the bottom: recording the height h of the carbon fiber plate, chiseling a through-length groove 5 with the width of 1.5cm and the depth of h +3cm in the length direction of the beam at the bottom of the original wood beam 1 and the center of the bottom of the new wood beam 3; carefully cleaning the wood chips in the groove by using an air compressor;
(5) splicing: splicing the original wood beam 1 and the new wood beam 2 according to the tenon 4 and the mortise 2, coating epoxy resin 8 at the spliced part, respectively recording two trisection sections between the section A and the section B as a section C1 and a section C2, drilling holes 6 with the aperture of 12mm at 0.3D positions on two sides of a central axis perpendicular to a splicing surface in the length direction on the sections C1 and C2, penetrating the holes 6 through the original wood beam 1 and the new wood beam 3, manufacturing countersunk head bolts 7 according to the hole diameters, filling the holes with wood chip cement after injecting the epoxy resin 8, and planing the pier joint by adopting a woodworking planer tool;
(6) the embedded carbon fiber plate 9: injecting epoxy resin 8 with the depth of 0.5h +1.5cm into the reserved groove 5, then putting a carbon fiber plate 9 with the same length as the beam, extruding to enable the carbon fiber plate to be in full contact with the epoxy resin 8, and then filling the epoxy resin 8 into the reserved groove 5 to be 0.5cm away from the bottom surface of the beam;
(7) surface treatment: after the epoxy resin 8 is cured, filling the reserved groove 5 with wood chip cement until the reserved groove is flush with the bottom surface of the beam, and polishing and cleaning the surface after the wood chip cement is cured; the overflowing epoxy resin 8 is wiped off with a spatula.
The above is only a preferred embodiment of the present invention, and is intended to show the prominent technical effects and advantages of the present invention, and not to limit the technical solution of the present invention. It should be understood by those skilled in the art that all modifications, changes or substitutions based on the technical contents of the present invention should be covered within the technical scope of the appended claims.
Claims (7)
1. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building in a pier mode is characterized by comprising the following steps:
a) preparing colloid: selecting epoxy resin (8) which is beneficial to construction as a bonding colloid material;
b) pretreating the log beam (1): polishing the convex part on the surface of the log beam (1) to be flat, removing the corroded surface layer, then removing broken slag in the crack by using a steel wire brush and removing moth by using compressed air, and filling the crack by using epoxy resin (8); measuring the length of a rotten part of the log beam (1) as S1, and the diameter of the log beam (1) as D;
c) and (3) cutting rotten ends: performing full circle cutting with the diameter of D at the lower cross section (A) of the length of S1+5cm at the decay end of the log beam (1), wherein a square log beam tenon (4) with the side length of D/4 is reserved towards the decay end of the cross section A, and the tenon (4) is D/3 long; cutting a semicircle with the diameter of D at an upper cross section (B) with the length of' max { S1,40cm } in the direction of the cross section A far away from the decay end, wherein the cutting length is the length between a lower cross section (A) and the upper cross section (B), but a square log beam mortise (2) with the side length of D/4 needs to be reserved towards the far decay end of the upper cross section (B), and the length of the mortise (2) is D/3; after the cutting is finished, the saw dust is cleaned, and the cut is polished;
d) selecting a joggled new wood beam (3): selecting new wood which is consistent with the variety of the original wood beam (1), has the same diameter, has the moisture content of less than 20 percent in the drying degree and cannot crack; preparing a new wood beam (3) according to the tenon (4) and the mortise (2) reserved in the original wood beam (1);
e) longitudinally slotting the bottom: recording the height or the diameter of the fiber pultrusion composite material (9) as h, and chiseling a through long groove (5) in the length direction of the beam at the bottom of the original wood beam (1) and the center of the bottom of the new wood beam (3); carefully cleaning the wood chips in the groove;
f) splicing: splicing an original wood beam (1) and a new wood beam (3) according to a mortise (4) and a mortise (2), smearing epoxy resin (8) at a spliced part, respectively recording two trisection sections between a lower cross section (A) and an upper cross section (B) as a first section (C1) and a second section (C2), chiseling holes (6) at 0.3D positions on the two sides of a central axis perpendicular to a splicing surface in the length direction on the first section (C1) and the second section (C2), penetrating the holes (6) through the original wood beam (1) and the new wood beam (3), manufacturing countersunk bolts (7) according to the hole diameters, filling the holes with wood chip cement after injecting the epoxy resin (8), and planing a pier joint by using a woodworking planer tool;
g) fibre-embedded pultruded composite (9): injecting epoxy resin (8) with half groove height into the reserved groove (5), then placing a fiber pultrusion composite material (9) with the same length as the beam, extruding to enable the fiber pultrusion composite material to be fully contacted with the epoxy resin (8), and then filling the epoxy resin (8) in the reserved groove (5) to be 0.5cm away from the bottom surface of the beam;
h) surface treatment: after the epoxy resin (8) is cured, filling the reserved groove (5) with wood chip cement until the reserved groove is flush with the bottom surface of the beam, and polishing and cleaning the surface after the wood chip cement is cured; the overflowing epoxy resin was wiped off with a spatula.
2. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: in the preparation of the epoxy resin (8), a low-speed stirring electric drill is used for stirring during stirring, so that the colloid is prevented from being stirred too fast to generate bubbles in the colloid, and the high thixotropy is required.
3. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: and b), filling the crack with epoxy resin (8), and filling the epoxy resin (8) colloid filling the crack with a pressure glue injection mode.
4. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: the full-length groove (5) has the width of 1.4 cm-1.6 cm and the depth of h +2 cm-h +3 cm.
5. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: the fiber pultrusion composite material (9) is a carbon fiber plate or a carbon fiber rib.
6. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: the sawdust cleaning mode in the step e) is air compressor cleaning.
7. The method for connecting the end parts of the wooden beams on the clear water surface of the historic building according to claim 1, wherein the method comprises the following steps: the aperture of the hole (6) is 12 mm-15 mm.
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| CN202010290346.5A CN111425005A (en) | 2020-04-14 | 2020-04-14 | Method for connecting end parts of wooden beams on clear water surface of historic building in pier mode |
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| CN202010290346.5A CN111425005A (en) | 2020-04-14 | 2020-04-14 | Method for connecting end parts of wooden beams on clear water surface of historic building in pier mode |
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Cited By (1)
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| CN114635581A (en) * | 2022-03-16 | 2022-06-17 | 东南大学 | Bucket arch hidden type reinforcing method based on three-dimensional seven-direction hybrid fiber ribs |
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