A reinforced old large-span steel-wood roof truss system and construction method thereof

Abstract

A reinforced old large-span steel-wood truss system and a construction method thereof, comprising a truss unit, purlins, roof panels, longitudinal braces and scissor braces; the two ends of the truss unit are supported on a left main body member and a right main body member; the truss unit comprises a truss support, a lower chord, a web and an upper chord; the truss support is connected to the left main body member through a first bottom connector, and comprises a vertical brace, a diagonal brace and a first steel sleeve; the top of the vertical brace is connected with a first steel sleeve, and the top of the diagonal brace is connected with a second steel sleeve; the upper chord is a wooden structure, obliquely arranged between the truss support and the right main body member; the upper chord comprises an old upper chord rod, a new upper chord rod, a first carbon fiber cloth hoop and a first carbon fiber plate; the lower chord is horizontally arranged below the upper chord; the lower chord is made of steel bars, and a suspension bar is connected between the lower chord and the upper chord; the web is arranged between the two lower chords and the upper chord at intervals. The present invention solves the technical problem that the traditional repair of the wooden truss of an existing house cannot preserve the original architectural style and cannot effectively protect the ancient buildings.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a reinforced old large-span steel-wood roof truss system and a construction method thereof. Background Art

[0002] The traditional way of repairing old large-span wooden frame houses is to dismantle and discard the original components, and then use new wood to restore the house to its original state. This practice will destroy the original appearance of the building, fail to preserve the original state of the building, and make the rebuilt house lack the sense of history. Especially for some buildings with historical research value or buildings with cultural heritage, this method cannot play an effective role in protection. Summary of the invention

[0003] The purpose of the present invention is to provide a reinforced old large-span steel-wood roof truss system and a construction method thereof, in order to solve the technical problem that the traditional repair of the wooden roof trusses of existing houses cannot preserve the original architectural style and cannot effectively protect the ancient buildings.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] A reinforced old large-span steel-wood roof truss system is arranged between the tops of the left main body member and the right main body member, and includes a roof truss unit, a purlin, a roof panel, a longitudinal brace and a scissor brace; the roof truss unit has a group and is arranged at intervals along the longitudinal direction; the two ends of each roof truss unit are supported on the left main body member and the right main body member respectively; the roof truss unit includes a roof truss support, a lower chord, a web member and an upper chord; the roof truss support is connected to the left main body member through a first bottom connecting piece, and the roof truss support includes a vertical brace, a diagonal brace and a first steel sleeve; the first steel sleeve is sleeved on the lower ends of the vertical brace and the diagonal brace, and the vertical brace and the diagonal brace are fixedly connected to the first bottom connecting piece; first tie bolts are respectively connected between the first steel sleeve and the vertical brace and the diagonal brace; the first structural adhesive is poured into the first steel sleeve; the top of the vertical brace is fixedly connected to a first steel sleeve head, and the top surface of the first steel sleeve head is an inclined surface; the top of the diagonal brace is fixedly connected to a second steel sleeve head, and the top surface of the second steel sleeve head is an inclined surface;

[0006] The upper chord is a wooden structure, which is obliquely arranged between the roof truss support and the right main body member; the upper chord includes an old upper chord rod, a new upper chord rod, a first carbon fiber cloth hoop and a first carbon fiber plate; a first strip groove is opened on the front and rear sides of the old upper chord rod along the long axis of the old upper chord rod; two first carbon fiber plates are arranged in each first strip groove, and the two first carbon fiber plates are arranged along the vertical interval; each first carbon fiber plate is arranged along the long axis of the first strip groove; the first strip groove is filled with a first adhesive; the new upper chord rod is attached to the top of the old upper chord rod, and the new upper chord rod is connected to the old upper chord rod by a first fastener; an upper chord reinforcement rod is attached to the bottom of the old upper chord rod, near the mid-span position; the upper chord reinforcement rod is connected to the old upper chord rod by a second fastener; there is a group of the first carbon fiber cloth hoops, which are arranged at intervals along the long axis of the upper chord, and each first carbon fiber cloth hoop hoops the new upper chord rod and the old upper chord rod into a whole;

[0007] A group of steel hoops are sleeved on the outer surface of the upper chord and spaced along the long axis of the upper chord; two steel hoops located at the upper end of the upper chord are overlapped on the first steel hoops and the second steel hoops respectively, and the two steel hoops are welded to the first steel hoops and the second steel hoops respectively; a second steel sleeve is sleeved on the lower end of the upper chord, and a second structural adhesive is poured into the second steel sleeve; a second tie bolt is connected between the second steel sleeve and the upper chord, and the second steel sleeve is connected to the right main body component through a second bottom connector;

[0008] There are two lower chords, which are horizontally arranged below the upper chord; the two lower chords are made of steel bars and are arranged at intervals in the longitudinal direction; the left end of the lower chord is connected to the first bottom connecting piece, and the right end of the lower chord is connected to the second bottom connecting piece; a suspension bar is connected between the two lower chords and the upper chord; there is a group of suspension bars, and a group of suspension bars is correspondingly arranged with a group of steel hoops; the upper end of the suspension bar passes through the upper chord and the steel hoops, and is fixed to the steel hoops by a first nut; a wedge-shaped pad is provided between the first nut and the steel hoops; the wedge-shaped pad is welded to the top of the corresponding steel hoops, and the bottom surface of the wedge-shaped pad is an inclined surface adapted to the top surface of the upper chord, and the top surface of the wedge-shaped pad is a horizontal surface; the lower end of the suspension bar is connected to a supporting member; the two lower chords are mounted on the supporting member;

[0009] There is a group of web members, which are arranged at intervals between the two lower chords and the upper chord; each web member is arranged at an angle, the upper end of the web member is connected to the corresponding steel sleeve, and the lower end of the web member is supported on the corresponding support member; the web member is a wooden structure, and a second strip groove is opened on the front and rear side surfaces of the web member along the long axis of the web member; two second carbon fiber plates are arranged in the second strip groove on each side, and the two second carbon fiber plates are arranged at intervals along the vertical direction; each second carbon fiber plate is arranged along the long axis of the second strip groove ; The second strip groove is filled with a second adhesive; On the web, a second carbon fiber cloth hoop is provided along the long axis at intervals; A third steel sleeve is sleeved on the bottom of the web, and the web and the third steel sleeve are connected by a third tie bolt; The third steel sleeve fixes the web and the support member, and a third structural adhesive is poured into the third steel sleeve; A third steel sleeve head is sleeved on the upper end of the web; The top surface of the third steel sleeve head is attached to the bottom surface of the corresponding steel sleeve hoop, and is welded to the steel sleeve hoop;

[0010] There are multiple groups of scissor braces, each group of scissor braces is arranged longitudinally; the scissor braces are longitudinally arranged between adjacent roof truss units;

[0011] There are multiple groups of longitudinal braces, and each group of longitudinal braces is arranged along the longitudinal direction; the two ends of the longitudinal braces are respectively connected to the lower chords of adjacent roof truss units.

[0012] Preferably, the first bottom connecting member includes a first mounting groove, a first connecting plate and a first anchor bolt; the first mounting groove is arranged at the top of the left main body component, and the longitudinal section of the first mounting groove is U-shaped; the left ends of the two corresponding lower chords are respectively inserted into the first mounting grooves and welded to the first mounting grooves; the first connecting plate has two pieces, which are respectively welded to the bottom of the front and rear sides of the first mounting groove; the first anchor bolt is passed through the first connecting plate to fix the first connecting plate to the left main body component.

[0013] Preferably, the second bottom connecting member includes a second mounting groove and a second anchor bolt; the second mounting groove is arranged at the top of the right main body component, and the longitudinal section of the second mounting groove is U-shaped; the right ends of the two corresponding lower chords are respectively inserted into the second mounting grooves and welded to the second mounting grooves; the second anchor bolt is passed through the second mounting groove to fix the second mounting groove to the right main body component.

[0014] Preferably, the anchor member includes a anchor plate and a pad; the longitudinal section of the anchor plate is U-shaped, and two corresponding lower chords are placed on the anchor plate; the lower end of the suspension rod passes through the horizontal plate section of the anchor plate and is fixed by a second nut; the pad is placed between the second nut and the anchor plate.

[0015] Preferably, the upper end of the scissors strut is connected to the corresponding upper chord through an upper connecting bolt; the upper connecting bolt is horizontally inserted into the scissors strut and the upper chord, an outer wooden pad is provided between the scissors strut and the upper connecting bolt, and an inner wooden pad is provided between the scissors strut and the upper chord; the outer wooden pad and the inner wooden pad are both triangular pads.

[0016] Preferably, a corner reinforcement rod is also supported between the vertical support and the upper chord; the corner reinforcement rod is a wooden square, and one end of the corner reinforcement rod is connected to the vertical support through a fourth tie bolt, and the other end of the corner reinforcement rod is connected to the upper chord through a fifth tie bolt.

[0017] Preferably, the new upper chord rod and the old upper chord rod are bonded to each other via a third adhesive; and the old upper chord rod and the upper chord reinforcement rod are connected to each other via a fourth adhesive.

[0018] Preferably, a longitudinal connecting rod is provided at the bottom of the lower chord, and the cross-section of the longitudinal connecting rod is U-shaped; the longitudinal brace is made of round wooden poles, and the two ends of the longitudinal brace are respectively overlapped in the U-shaped grooves of the longitudinal connecting rods on both sides and fixed by a fifth tie bolt; the lower ends of the scissors braces are connected to the corresponding longitudinal connecting rods by lower connecting bolts.

[0019] Preferably, the first carbon fiber cloth hoop and the second carbon fiber cloth hoop are both formed by stacking three layers of carbon fiber cloth strips, and the widths of the first carbon fiber cloth hoop and the second carbon fiber cloth hoop are both not less than 50 mm.

[0020] A construction method for a reinforced old large-span steel-wood roof truss system comprises the following steps.

[0021] Step 1: Remove the roof panels.

[0022] Step 2: Number each component in the old large-span steel-wood roof truss system and keep photos of the current status.

[0023] Step 3: Replace the lower chord and suspension rod.

[0024] Step 4: Check the purlins, roof truss supports, old upper chords, web members, longitudinal braces and scissor braces, restore them to their original state according to the retained impact data, and repair or replace the damaged parts; then carry out fireproofing, anti-corrosion and anti-termite treatment on each component.

[0025] Step 5: a new upper chord is arranged on the top of the old upper chord, and the new upper chord is connected to the old upper chord by a first fastener; and then the new upper chord and the old upper chord are hooped into a whole with a first carbon fiber cloth.

[0026] Step 6: On the web, second carbon fiber cloth hoops are arranged at intervals along the long axis.

[0027] Step seven, a first strip groove is provided on the front and rear side surfaces of the old upper chord rod along the long axis of the old upper chord rod, and a second strip groove is provided on the front and rear side surfaces of the web rod along the long axis of the web rod.

[0028] Step eight, placing a first carbon fiber plate in the first strip groove and placing a second carbon fiber plate in the second strip groove.

[0029] Step nine, sleeve the first steel sleeve on the lower end of the vertical support and the diagonal support, fix the first steel sleeve head on the top of the vertical support, and fix the second steel sleeve head on the top of the diagonal support; sleeve the second steel sleeve on the lower end of the upper chord, and sleeve a group of steel hoops on the outer surface of the upper chord and at intervals along the long axis of the upper chord; at the same time, sleeve the third steel sleeve on the bottom of the web bar, and sleeve the third steel sleeve head on the upper end of the web bar.

[0030] Step ten, hoist and fix the assembled components to be replaced.

[0031] Step 11: Installation of roof panels. This completes the construction.

[0032] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0033] 1. The reinforced old large-span steel-wood roof truss system of the present invention replaces the steel components in the steel-wood roof truss system and reinforces the wood components in their original appearance without dismantling them, thereby solving the technical problem that the traditional repair of the wood roof truss of existing houses cannot preserve the original architectural style and cannot effectively protect the ancient buildings.

[0034] 2. The present invention arranges a new upper chord on the top of the old upper chord, and connects the new upper chord to the old upper chord by a first fastener; then the new upper chord and the old upper chord are hooped into a whole by a first carbon fiber cloth; at the same time, the present invention opens a first strip groove on the front and rear sides of the old upper chord and along the long axis of the old upper chord, and installs a first carbon fiber plate in the first strip groove; when reinforcing the old upper chord, the present invention combines the force performance of the old upper chord in the structure, and mainly strengthens it from the perspective of stiffness and tensile resistance, and the specific measures taken for the old upper chord and the new upper chord in the present application not only increase the force performance of the upper chord, but also maintain its original appearance to the maximum extent.

[0035] 3. The present invention provides a second strip groove on the front and rear sides of the web and along the long axis of the web, and arranges a second carbon fiber plate in the second strip groove. The applicant hides the second carbon fiber plate in the second strip groove to increase the stress-bearing performance of the web and also maintains the original appearance of the web to the maximum extent.

[0036] 4. In the present invention, a first steel sleeve is sleeved on the lower ends of the vertical brace and the diagonal brace, a first steel sleeve head is fixedly connected to the top of the vertical brace, and a second steel sleeve head is fixedly connected to the top of the diagonal brace; a second steel sleeve is sleeved on the lower end of the upper chord, and a group of steel hoops are sleeved on the outer surface of the upper chord and at intervals along the long axis of the upper chord; at the same time, a third steel sleeve is sleeved on the bottom of the web member, and a third steel sleeve head is sleeved on the upper end of the web member; this structural design changes the state in which the nodes of the wooden components in the traditional wooden truss system are weak stress points, and improves the stress-bearing performance of the node position. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] Figure 1 It is a front structural schematic diagram of the old large-span steel-wood roof truss system of the present invention.

[0039] Figure 2 This is an embodiment diagram of the present invention in which the scissors braces and longitudinal braces are arranged between a group of roof truss units.

[0040] Figure 3 It is a schematic diagram of the connection structure between the upper chord and the scissors strut on one side in the present invention.

[0041] Figure 4 It is a schematic diagram of the connection structure between the upper chord and the scissors struts on both sides in the present invention.

[0042] Figure 5 It is a front structural schematic diagram of the connection structure between the roof truss support and the left main body component in the present invention.

[0043] Figure 6 It is a schematic diagram of the longitudinal section structure of the connection structure between the roof truss support and the left main body member in the present invention.

[0044] Figure 7 It is a schematic diagram of the horizontal section structure of the roof truss support in the present invention.

[0045] Figure 8 It is a front structural schematic diagram of the upper chord in the present invention.

[0046] Fig. 9 It is a front structural schematic diagram of the connection structure between the upper chord and the right main body component in the present invention.

[0047] Fig.10 It is a schematic diagram of the longitudinal section structure of the connection structure between the upper chord and the right main body component in the present invention.

[0048] Fig.11 It is a schematic diagram of the connection structure of the scissor brace and the longitudinal brace respectively with the longitudinal connecting rod in the present invention.

[0049] Fig.12It is a schematic diagram of the longitudinal section structure of the connection structure between the old upper chord rod and the new upper chord rod in the present invention.

[0050] Fig.13 It is a schematic diagram of the longitudinal section structure of the connection structure between the old upper chord rod and the upper chord reinforcement rod in the present invention.

[0051] Fig.14 It is a front structural schematic diagram of the connection structure between the vertical support and the upper chord in the present invention.

[0052] Fig.15 It is a schematic diagram of the longitudinal section structure of the connection structure between the vertical support and the upper chord in the present invention.

[0053] Fig.16 It is a front structural schematic diagram of the connection structure between the diagonal brace and the upper chord in the present invention.

[0054] Fig.17 It is a schematic diagram of the longitudinal section structure of the connection structure between the diagonal brace and the upper chord in the present invention.

[0055] Fig.18 It is a schematic diagram of the connection structure between the supporting member and the suspension rod in the present invention.

[0056] Fig.19 It is a front structural schematic diagram of the supporting member supported at the bottom of the diagonal support in the present invention.

[0057] Fig. 20 It is a schematic diagram of the longitudinal cross-sectional structure of the anchoring member anchored at the bottom of the diagonal support in the present invention.

[0058] Fig.21 It is a schematic diagram of the connection structure between the diagonal brace and the upper chord in the present invention.

[0059] Fig. 22 It is a schematic diagram of the cross-sectional structure of the diagonal brace in the present invention.

[0060] Figure numbers: 1-left main member, 2-right main member, 3-purlin, 4-roof panel, 5-longitudinal brace, 6-scissor brace, 7-roof truss support, 7.1-vertical brace, 7.2-diagonal brace, 7.3-first steel sleeve, 7.4-first tie bolt, 7.5-first structural adhesive, 7.6-first steel sleeve, 7.7-second steel sleeve, 8-lower chord, 9-web member, 10-upper chord, 10.1-old upper chord rod, 10. 2-new upper chord rod, 10.3-first carbon fiber cloth hoop, 10.4-first carbon fiber plate, 10.5-first adhesive, 10.6-first fastener, 10.7-upper chord reinforcement rod, 10.8-second fastener, 10.9-second steel sleeve, 10.10-second structural adhesive, 10.11-second tie bolt, 10.12-third adhesive, 10.13-fourth adhesive, 11-first bottom Connector, 11.1 - first mounting groove, 11.2 - first connecting plate, 11.3 - first anchor bolt, 12 - first strip groove, 13 - steel sleeve, 14 - second bottom connector, 14.1 - second mounting groove, 14.2 - second anchor bolt, 15 - hanging rod, 16 - first nut, 17 - wedge-shaped pad, 18 - anchor, 18.1 - anchor plate, 18.2 - pad, 19 - second strip groove, 20 - second Carbon fiber plate, 21 - second adhesive, 22 - second carbon fiber cloth hoop, 23 - third steel sleeve, 24 - third steel sleeve head, 25 - third structural adhesive, 26 - third tie bolt, 27 - second nut, 28 - upper connecting bolt, 29 - outer wooden pad, 30 - inner wooden pad, 31 - corner reinforcement rod, 32 - fourth tie bolt, 33 - fifth tie bolt, 34 - longitudinal connecting rod, 35 - lower connecting bolt. DETAILED DESCRIPTION

[0061] like Figure 1-22As shown, this reinforced old large-span steel-wood roof truss system is arranged between the tops of the left main member 1 and the right main member 2, and includes a roof truss unit, a purlin 3, a roof panel 4, a longitudinal brace 5 and a scissor brace 6; there is a group of the roof truss units, which are arranged at intervals along the longitudinal direction; the two ends of each roof truss unit are supported on the left main member 1 and the right main member 2 respectively; the roof truss unit includes a roof truss support 7, a lower chord 8, a web member 9 and an upper chord 10; the roof truss support 7 is connected to the left main member 1 through a first bottom connector 11, and the roof truss support 7 includes a vertical brace 7.1, a diagonal brace 7.2 and a first steel sleeve 7 .3; the first steel sleeve 7.3 is sleeved on the lower ends of the vertical support 7.1 and the diagonal support 7.2, and the vertical support 7.1 and the diagonal support 7.2 are fixedly connected to the first bottom connector 11; first tie bolts 7.4 are connected between the first steel sleeve 7.3 and the vertical support 7.1 and the diagonal support 7.2 respectively; the first structural adhesive 7.5 is poured into the first steel sleeve 7.3; the top of the vertical support 7.1 is fixedly connected with a first steel sleeve head 7.6, and the top surface of the first steel sleeve head 7.6 is an inclined surface; the top of the diagonal support 7.2 is fixedly connected with a second steel sleeve head 7.7, and the top surface of the second steel sleeve head 7.7 is an inclined surface;

[0062] The upper chord 10 is a wooden structure and is obliquely arranged between the roof truss support 7 and the right main body member 2; the upper chord 10 includes an old upper chord rod 10.1, a new upper chord rod 10.2, a first carbon fiber cloth hoop 10.3 and a first carbon fiber plate 10.4; a first strip groove 12 is provided on the front and rear side surfaces of the old upper chord rod 10.1 along the long axis of the old upper chord rod 10.1; two first carbon fiber plates 10.4 are arranged in each first strip groove 12, and the two first carbon fiber plates 10.4 are arranged at intervals along the vertical direction; each first carbon fiber plate 10.4 is arranged along the long axis of the first strip groove 12; the first strip groove 1 2 is filled with a first adhesive 10.5; the new upper chord rod 10.2 is attached to the top of the old upper chord rod 10.1 throughout its length, and the new upper chord rod 10.2 and the old upper chord rod 10.1 are connected by a first fastener 10.6; an upper chord reinforcement rod 10.7 is attached to the bottom of the old upper chord rod 10.1, near the mid-span position; the upper chord reinforcement rod 10.7 is connected to the old upper chord rod 10.1 by a second fastener 10.8; there is a group of the first carbon fiber cloth hoop 10.3, which is arranged at intervals along the long axis of the upper chord rod 10, and each first carbon fiber cloth hoop 10.3 hoops the new upper chord rod 10.2 and the old upper chord rod 10.1 into a whole;

[0063] A group of steel hoops 13 are sleeved on the outer surface of the upper chord 10 and spaced along the long axis of the upper chord 10; the two steel hoops 13 located at the upper end of the upper chord 10 are overlapped on the first steel hoops 7.6 and the second steel hoops 7.7 respectively, and the two steel hoops 13 are welded and connected to the first steel hoops 7.6 and the second steel hoops 7.7 respectively; the lower end of the upper chord 10 is sleeved with a second steel sleeve 10.9, and the second structural adhesive 10.10 is poured into the second steel sleeve 10.9; a second tie bolt 10.11 is connected between the second steel sleeve 10.9 and the upper chord 10, and the second steel sleeve 10.9 is connected to the right main body component 2 through a second bottom connector 14;

[0064] There are two lower chords 8, which are horizontally arranged below the upper chord 10; the two lower chords 8 are made of steel bars and are arranged at intervals in the longitudinal direction; the left end of the lower chord 8 is connected to the first bottom connecting piece 11, and the right end of the lower chord 8 is connected to the second bottom connecting piece 14; a suspension bar 15 is connected between the two lower chords 8 and the upper chord 10; there is a group of suspension bars 15, and a group of suspension bars 15 is correspondingly arranged with a group of steel hoop 13; the upper end of the suspension bar 15 passes through the upper chord 10 and the steel hoop 13, and is fixed to the steel hoop 13 by a first nut 16; a wedge-shaped pad 17 is padded between the first nut 16 and the steel hoop 13; the wedge-shaped pad 17 is welded to the top of the corresponding steel hoop 13, and the bottom surface of the wedge-shaped pad 17 is an inclined surface adapted to the top surface of the upper chord 10, and the top surface of the wedge-shaped pad 17 is a horizontal surface; the lower end of the suspension bar 15 is connected to a support member 18; the two lower chords 8 are installed on the support member 18;

[0065] There is a group of web members 9, which are arranged at intervals between the two lower chords 8 and the upper chord 10; each web member 9 is arranged at an angle, the upper end of the web member 9 is connected to the corresponding steel sleeve 13, and the lower end of the web member 9 is supported on the corresponding support member 18; the web member 9 is a wooden structure, and a second strip groove 19 is opened on the front and rear side surfaces of the web member 9 and along the long axis of the web member 9; two second carbon fiber plates 20 are arranged in the second strip groove 19 on each side, and the two second carbon fiber plates 20 are arranged at intervals along the vertical direction; each second carbon fiber plate 20 is arranged along the long axis of the second strip groove 19; the second The two strip grooves 19 are filled with a second adhesive 21; on the web 9, a second carbon fiber cloth hoop 22 is provided at intervals along the long axis; a third steel sleeve 23 is sleeved at the bottom of the web 9, and the web 9 and the third steel sleeve 23 are connected by a third tie bolt 26; the third steel sleeve 23 fixes the web 9 and the anchor 18, and a third structural adhesive 25 is poured into the third steel sleeve 23; the upper end of the web 9 is sleeved with a third steel sleeve head 24; the top surface of the third steel sleeve head 24 is attached to the bottom surface of the corresponding steel sleeve hoop 13, and is welded to the steel sleeve hoop 13;

[0066] There are multiple groups of scissor braces 6, and each group of scissor braces 6 is arranged longitudinally; the scissor braces 6 are longitudinally arranged between adjacent roof truss units;

[0067] There are multiple groups of longitudinal braces 5, and each group of longitudinal braces 5 is arranged in the longitudinal direction; both ends of the longitudinal braces 5 are respectively connected to the lower chords 8 of adjacent roof truss units.

[0068] In this embodiment, the first bottom connecting member 11 includes a first mounting groove 11.1, a first connecting plate 11.2 and a first anchor bolt 11.3; the first mounting groove 11.1 is arranged at the top of the left main body component 1, and the longitudinal section of the first mounting groove 11.1 is U-shaped; the left ends of the two corresponding lower chords 8 are respectively inserted into the first mounting groove 11.1 and welded to the first mounting groove 11.1; the first connecting plate 11.2 has two pieces, which are respectively welded to the bottom of the front and rear sides of the first mounting groove 11.1; the first anchor bolt 11.3 is penetrated in the first connecting plate 11.2 to fix the first connecting plate 11.2 to the left main body component 1.

[0069] In this embodiment, the second bottom connecting member 14 includes a second mounting groove 14.1 and a second anchor bolt 14.2; the second mounting groove 14.1 is arranged at the top of the right main body component 2, and the longitudinal section of the second mounting groove 14.1 is U-shaped; the right ends of the two corresponding lower chords 8 are respectively inserted into the second mounting groove 14.1 and welded to the second mounting groove 14.1; the second anchor bolt 14.2 is passed through the second mounting groove 14.1 to fix the second mounting groove 14.1 to the right main body component 2.

[0070] In this embodiment, the anchor member 18 includes an anchor plate 18.1 and a pad 18.2; the longitudinal section of the anchor plate 18.1 is U-shaped, and the two corresponding lower chords 8 are placed on the anchor plate 18.1; the lower end of the suspension rod 15 passes through the horizontal plate section of the anchor plate 18.1 and is fixed by a second nut 27; the pad 18.2 is padded between the second nut 27 and the anchor plate 18.1.

[0071] In this embodiment, the upper end of the scissors strut 6 is connected to the corresponding upper chord 10 through an upper connecting bolt 28; the upper connecting bolt 28 is horizontally inserted into the scissors strut 6 and the upper chord 10, an outer wooden pad 29 is padded between the scissors strut 6 and the upper connecting bolt 28, and an inner wooden pad 30 is padded between the scissors strut 6 and the upper chord 10; the outer wooden pad 29 and the inner wooden pad 30 are both triangular pads.

[0072] In this embodiment, a corner reinforcement rod 31 is also supported between the vertical support 7.1 and the upper chord 10; the corner reinforcement rod 31 is a wooden square, and one end of the corner reinforcement rod 31 is connected to the vertical support 7.1 through a fourth tie bolt 32, and the other end of the corner reinforcement rod 31 is connected to the upper chord 10 through a fifth tie bolt 33.

[0073] In this embodiment, the new upper chord rod 10.2 is bonded to the old upper chord rod 10.1 by a third adhesive 10.12; the old upper chord rod 10.1 is connected to the upper chord reinforcement rod 10.7 by a fourth adhesive 10.13.

[0074] In this embodiment, a longitudinal connecting rod 34 is provided at the bottom of the lower chord 8, and the cross-section of the longitudinal connecting rod 34 is U-shaped; the longitudinal brace 5 is made of a round wooden pole, and the two ends of the longitudinal brace 5 are respectively overlapped in the U-shaped grooves of the longitudinal connecting rod 34 on both sides, and are fixed by a fifth tie bolt 33; the lower ends of the scissors braces 6 are connected to the corresponding longitudinal connecting rods 34 by lower connecting bolts 35.

[0075] In this embodiment, the first carbon fiber cloth hoop 10.3 and the second carbon fiber cloth hoop 22 are both formed by stacking three layers of carbon fiber cloth strips, and the width of the first carbon fiber cloth hoop 10.3 and the second carbon fiber cloth hoop 22 is not less than 50 mm.

[0076] In this embodiment, the first fastener 10.6 is a screw or a bolt; the first fastener 10.6 is arranged in a group, and the spacing between adjacent first fasteners 10.6 is 200mm; the cross-sectional height of the old upper chord rod 10.1 is 200mm, the cross-sectional width of the old upper chord rod 10.1 is 120mm, and the bottom surface of the old upper chord rod 10.1 is a semicircular arc surface; the cross-sectional height of the new upper chord rod 10.2 is 80mm, and the cross-sectional width of the new upper chord rod 10.2 is 120mm; the second fastener 10.8 is a screw or a bolt.

[0077] In this embodiment, the depth of the first strip groove 12 is 30 mm, and the width of the first strip groove 12 is 20 mm; the width of the first carbon fiber plate 10.4 is adapted to the depth of the first strip groove 12.

[0078] In this embodiment, the old large-span steel-wood roof truss system is a single steel-wood roof truss system.

[0079] In this embodiment, the left main component 1 and the right main component 2 are both concrete structures, which are structural columns, structural beams or structural walls.

[0080] In this embodiment, there is a group of longitudinal braces 5, which are arranged at intervals in the transverse direction; the spacing between adjacent longitudinal braces 5 is 900 mm; the longitudinal braces 5 are made of round wood poles, and the diameter of the round wood poles is 80 mm.

[0081] In this embodiment, the length of the upper chord 10 is 8500mm~10000mm; the length of the upper chord reinforcement rod 10.7 is 2500mm~3000mm.

[0082] In this embodiment, the length of the lower end of the first anchor bolt 11.3 extending into the left main body member 1 is not less than 200 mm.

[0083] In this embodiment, the diameter of the lower chord is 20-25 mm.

[0084] In this embodiment, a group of scissors struts 6 are arranged continuously along the longitudinal direction between a group of roof truss units, or a group of scissors struts 6 are arranged alternately along the longitudinal direction between adjacent roof truss units, or a group of scissors struts 6 are arranged continuously along the longitudinal direction between a part of the roof truss units and are arranged alternately along the longitudinal direction between another part of the roof truss units.

[0085] In this embodiment, when the scissors strut 6 is arranged only on one side of the upper chord 10; the end of the upper connecting bolt 28 extends into the upper chord 10 and is threadedly connected to the upper chord 10; an outer wooden pad 29 is padded between the end of the upper connecting bolt 28 and the scissors strut 6, and an inner wooden pad 30 is padded between the scissors strut 6 and the upper chord 10.

[0086] When the scissors struts 6 are arranged on the front and rear sides of the upper chord 10, the upper connecting bolts 28 are passed through the upper chord 10 and the scissors struts 6 on both sides, and outer wooden pads 29 are respectively provided between the two ends of the upper connecting bolts 28 and the scissors struts 6 on both sides, and inner wooden pads 30 are respectively provided between the upper chord 10 and the scissors struts 6 on both sides.

[0087] In this embodiment, the longitudinal struts 5 are arranged between the scissor struts 6 that are arranged alternately in the longitudinal direction or at the bottom of the scissor struts 6 that are arranged continuously in the longitudinal direction.

[0088] In this embodiment, the circumferential overlap length of the carbon fiber strips of the first carbon fiber cloth hoop 10.3 is not less than 200 mm, and the circumferential overlap length of the carbon fiber strips of the second carbon fiber cloth hoop 22 is not less than 200 mm; the tensile strength standard value of the carbon fiber strips is ≥3400 MPa, and the calculated thickness is 0.167 mm.

[0089] In this embodiment, the surface of the steel components and steel bars are painted with anti-rust paint. The anti-rust paint can be selected from epoxy zinc-rich primer applied twice (thickness 70 microns) + epoxy micaceous iron intermediate paint applied twice (thickness 80 microns) + polyurethane topcoat applied once, the total dry film thickness is not less than 180 microns, and the color of the topcoat is determined by the building.

[0090] In this embodiment, the first structural adhesive 7.5, the second structural adhesive 10.10, and the third structural adhesive 25 are Class A modified epoxy resin adhesives.

[0091] In this embodiment, the upper chord 10 is formed by splicing a group of upper chord rod segments 10a, and two adjacent upper chord rod segments 10a are connected by a connecting steel plate 10b.

[0092] The construction method of this reinforced old large-span steel-wood roof truss system includes the following steps.

[0093] Step 1: remove the roof panel 4.

[0094] Step 2: Number each component in the old large-span steel-wood roof truss system and keep photos of the current status.

[0095] Step 3: Replace the lower chord 8 and the suspension rod 15.

[0096] Step 4: Check the purlins 3, roof truss supports 7, old upper chords 10.1, web members 9, longitudinal braces 5 and scissor braces 6, and restore them to their original state with reference to the retained impact data, and repair or replace the damaged parts; then perform fireproofing, anti-corrosion and anti-termite treatment on each component.

[0097] Step 5: a new upper chord 10.2 is arranged on the top of the old upper chord 10.1, and the new upper chord 10.2 is connected to the old upper chord 10.1 through a first fastener 10.6; and then the new upper chord 10.2 and the old upper chord 10.1 are hooped into a whole with a first carbon fiber cloth hoop 10.3.

[0098] Step six, on the web 9, second carbon fiber cloth hoops 22 are arranged at intervals along the long axis.

[0099] Step seven, a first strip groove 12 is opened on the front and rear sides of the old upper chord rod 10.1 along the long axis of the old upper chord rod 10.1, and a second strip groove 19 is opened on the front and rear sides of the web rod 9 along the long axis of the web rod 9.

[0100] Step eight: arrange the first carbon fiber plate 10 . 4 in the first strip groove 12 , and arrange the second carbon fiber plate 20 in the second strip groove 19 .

[0101] Step nine, sleeve the first steel sleeve 7.3 at the lower end of the vertical support 7.1 and the diagonal support 7.2, fix the first steel sleeve head 7.6 at the top of the vertical support 7.1, and fix the second steel sleeve head 7.7 at the top of the diagonal support 7.2; sleeve the second steel sleeve 10.9 at the lower end of the upper chord 10, and sleeve a group of steel hoops 13 on the outer surface of the upper chord 10 and at intervals along the long axis of the upper chord 10; at the same time, sleeve the third steel sleeve 23 at the bottom of the web bar 9, and sleeve the third steel sleeve head 24 at the upper end of the web bar 9.

[0102] Step ten, hoist and fix the assembled components to be replaced.

[0103] Step eleven, installation of the roof panel 4, the construction is now completed.

[0104] In this embodiment, the above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present invention rather than to limit the protection scope of the present invention. All applications derived from simple changes of the present invention fall within the protection scope of the present invention.

Claims

1. A reinforced old large-span steel-wood roof truss system, arranged between the tops of a left main body member (1) and a right main body member (2), comprising a roof truss unit, a purlin (3), a roof panel (4), a longitudinal brace (5) and a scissor brace (6); the roof truss unit is provided in a group and arranged at intervals in the longitudinal direction; the two ends of each roof truss unit are respectively supported on the left main body member (1) and the right main body member (2); the roof truss unit comprises a roof truss support (7), a lower chord (8), a web member (9) and an upper chord (10); the characteristics are as follows: The roof truss support (7) is connected to the left main body component (1) via a first bottom connecting piece (11), and the roof truss support (7) comprises a vertical support (7.1), a diagonal support (7.2) and a first steel sleeve (7.3); the first steel sleeve (7.3) is sleeved on the lower ends of the vertical support (7.1) and the diagonal support (7.2), and the vertical support (7.1) and the diagonal support (7.2) are fixedly connected to the first bottom connecting piece (11); A first tie bolt (7.4) is connected between the vertical support (7.1) and the diagonal support (7.2), respectively; a first structural adhesive (7.5) is poured into the first steel sleeve (7.3); a first steel sleeve (7.6) is fixedly connected to the top of the vertical support (7.1), and the top surface of the first steel sleeve (7.6) is an inclined surface; a second steel sleeve (7.7) is fixedly connected to the top of the diagonal support (7.2), and the top surface of the second steel sleeve (7.7) is an inclined surface; The upper chord (10) is a wooden structure and is obliquely arranged between the roof truss support (7) and the right main body member (2); the upper chord (10) comprises an old upper chord rod (10.1), a new upper chord rod (10.2), a first carbon fiber cloth hoop (10.3) and a first carbon fiber plate (10.4); a first strip groove (12) is provided on the front and rear side surfaces of the old upper chord rod (10.1) along the long axis of the old upper chord rod (10.1); two first carbon fiber plates (10.4) are arranged in each first strip groove (12), and the two first carbon fiber plates (10.4) are arranged at intervals in the vertical direction; each first carbon fiber plate (10.4) is arranged along the long axis of the first strip groove (12); the first strip groove (1 2) is filled with a first adhesive (10.5); the new upper chord rod (10.2) is attached to the top of the old upper chord rod (10.1) over its entire length, and the new upper chord rod (10.2) and the old upper chord rod (10.1) are connected via a first fastener (10.6); an upper chord reinforcement rod (10.7) is attached to the bottom of the old upper chord rod (10.1) near the mid-span position; the upper chord reinforcement rod (10.7) is connected to the old upper chord rod (10.1) via a second fastener (10.8); a group of the first carbon fiber cloth hoops (10.3) are arranged at intervals along the long axis of the upper chord rod (10), and each first carbon fiber cloth hoop (10.3) hoops the new upper chord rod (10.2) and the old upper chord rod (10.1) into a whole; A group of steel hoops (13) are sleeved on the outer surface of the upper chord (10) and are spaced apart along the long axis of the upper chord (10); two steel hoops (13) located at the upper end of the upper chord (10) are overlapped on the first steel hoops (7.6) and the second steel hoops (7.7) respectively, and the two steel hoops (13) are welded to the first steel hoops (7.6) and the second steel hoops (7.7) respectively; a second steel sleeve (10.9) is sleeved on the lower end of the upper chord (10), and a second structural adhesive (10.10) is poured into the second steel sleeve (10.9); a second tie bolt (10.11) is connected between the second steel sleeve (10.9) and the upper chord (10), and the second steel sleeve (10.9) is connected to the right main body component (2) via a second bottom connector (14); There are two lower chords (8) arranged horizontally below the upper chord (10); the two lower chords (8) are made of steel bars and are arranged at intervals in the longitudinal direction; the left end of the lower chord (8) is connected to the first bottom connecting piece (11), and the right end of the lower chord (8) is connected to the second bottom connecting piece (14); a suspension bar (15) is connected between the two lower chords (8) and the upper chord (10); there is a group of suspension bars (15), and one group of suspension bars (15) is correspondingly arranged with a group of steel hoops (13); the upper end of the suspension bar (15) passes through the upper chord (10) and a steel hoop (13), and is fixed to the steel hoop (13) by a first nut (16); a wedge-shaped pad (17) is provided between the first nut (16) and the steel hoop (13); the wedge-shaped pad (17) is welded to the top of the corresponding steel hoop (13), and the bottom surface of the wedge-shaped pad (17) is an inclined surface adapted to the top surface of the upper chord (10), and the top surface of the wedge-shaped pad (17) is a horizontal surface; the lower end of the suspension bar (15) is connected to a supporting member (18); and the two lower chords (8) are mounted on the supporting member (18); The web members (9) have a group and are arranged at intervals between the two lower chords (8) and the upper chord (10); each web member (9) is arranged obliquely, the upper end of the web member (9) is connected to the corresponding steel sleeve (13), and the lower end of the web member (9) is supported on the corresponding support member (18); the web member (9) is a wooden structure, and a second strip groove (19) is provided on the front and rear side surfaces of the web member (9) along the long axis of the web member (9); two second carbon fiber plates (20) are arranged in the second strip groove (19) on each side, and the two second carbon fiber plates (20) are arranged at intervals in the vertical direction; each second carbon fiber plate (20) is arranged along the long axis of the second strip groove (19); the second strip groove (19) is provided on the front and rear side surfaces of the web member (9) along the long axis of the web member (9); The shaped groove (19) is filled with a second adhesive (21); on the web bar (9), a second carbon fiber cloth hoop (22) is provided at intervals along the long axis; a third steel sleeve (23) is sleeved on the bottom of the web bar (9), and the web bar (9) and the third steel sleeve (23) are connected by a third tie bolt (26); the third steel sleeve (23) fixes the web bar (9) and the anchor (18), and a third structural adhesive (25) is poured into the third steel sleeve (23); a third steel sleeve head (24) is sleeved on the upper end of the web bar (9); the top surface of the third steel sleeve head (24) is attached to the bottom surface of the corresponding steel sleeve hoop (13), and is welded to the steel sleeve hoop (13); There are multiple groups of scissor braces (6), and each group of scissor braces (6) is arranged longitudinally; the scissor braces (6) are longitudinally arranged between adjacent roof truss units; There are multiple groups of longitudinal braces (5), and each group of longitudinal braces (5) is arranged in the longitudinal direction; the two ends of the longitudinal braces (5) are respectively connected to the lower chords (8) of adjacent roof truss units.

2. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: The first bottom connecting member (11) comprises a first mounting groove (11.1), a first connecting plate (11.2) and a first anchor bolt (11.3); the first mounting groove (11.1) is arranged at the top of the left main body component (1), and the longitudinal section of the first mounting groove (11.1) is U-shaped; the left ends of the two corresponding lower chords (8) are respectively inserted into the first mounting groove (11.1) and welded to the first mounting groove (11.1); the first connecting plate (11.2) has two pieces, which are respectively welded to the bottom of the front and rear sides of the first mounting groove (11.1); the first anchor bolt (11.3) is inserted into the first connecting plate (11.2) to fix the first connecting plate (11.2) to the left main body component (1).

3. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: The second bottom connecting member (14) comprises a second mounting groove (14.1) and a second anchor bolt (14.2); the second mounting groove (14.1) is arranged at the top of the right main body component (2), and the longitudinal section of the second mounting groove (14.1) is U-shaped; the right ends of the two corresponding lower chords (8) are respectively inserted into the second mounting groove (14.1) and are welded to the second mounting groove (14.1); the second anchor bolt (14.2) is inserted into the second mounting groove (14.1) to fix the second mounting groove (14.1) to the right main body component (2).

4. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized in that: The anchor member (18) comprises an anchor plate (18.1) and a pad (18.2); the longitudinal section of the anchor plate (18.1) is U-shaped, and two corresponding lower chords (8) are arranged on the anchor plate (18.1); the lower end of the suspension rod (15) passes through the horizontal plate section of the anchor plate (18.1) and is fixed by a second nut (27); the pad (18.2) is arranged between the second nut (27) and the anchor plate (18.1).

5. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: The upper end of the scissors brace (6) is connected to the corresponding upper chord (10) via an upper connecting bolt (28); the upper connecting bolt (28) is horizontally inserted into the scissors brace (6) and the upper chord (10); an outer wooden pad (29) is padded between the scissors brace (6) and the upper connecting bolt (28); and an inner wooden pad (30) is padded between the scissors brace (6) and the upper chord (10); the outer wooden pad (29) and the inner wooden pad (30) are both triangular pads.

6. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: A corner reinforcement rod (31) is also supported between the vertical support (7.1) and the upper chord (10); the corner reinforcement rod (31) is a wooden square, and one end of the corner reinforcement rod (31) is connected to the vertical support (7.1) via a fourth tie bolt (32), and the other end of the corner reinforcement rod (31) is connected to the upper chord (10) via a fifth tie bolt (33).

7. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: The new upper chord rod (10.2) and the old upper chord rod (10.1) are bonded together by a third bonding adhesive (10.12); and the old upper chord rod (10.1) and the upper chord reinforcement rod (10.7) are connected by a fourth bonding adhesive (10.13).

8. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: A longitudinal connecting rod (34) is provided at the bottom of the lower chord (8), and the cross-section of the longitudinal connecting rod (34) is U-shaped; the longitudinal brace (5) is made of round wood, and the two ends of the longitudinal brace (5) are respectively overlapped in the U-shaped grooves of the longitudinal connecting rods (34) on both sides and fixed by a fifth tie bolt (33); the lower ends of the scissor braces (6) are connected to the corresponding longitudinal connecting rods (34) by lower connecting bolts (35).

9. The reinforced old large-span steel-wood roof truss system according to claim 1 is characterized by: The first carbon fiber cloth hoop (10.3) and the second carbon fiber cloth hoop (22) are both formed by stacking three layers of carbon fiber cloth strips, and the width of the first carbon fiber cloth hoop (10.3) and the second carbon fiber cloth hoop (22) are both not less than 50 mm.

10. A construction method for the reinforced old large-span steel-wood roof truss system according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, removing the roof panel (4); Step 2: Number each component in the old large-span steel-wood roof truss system and keep photos of the current status; Step 3, replace the lower chord (8) and the suspension rod (15); Step 4: Check the purlins (3), roof truss supports (7), old upper chords (10.1), web members (9), longitudinal braces (5) and scissor braces (6), and restore them to their original state with reference to the remaining impact data, and repair or replace the damaged parts; then perform fireproofing, anti-corrosion and anti-insect treatment on each component; Step 5: a new upper chord rod (10.2) is arranged on the top of the old upper chord rod (10.1) through the entire length, and the new upper chord rod (10.2) is connected to the old upper chord rod (10.1) via a first fastener (10.6); and then the new upper chord rod (10.2) and the old upper chord rod (10.1) are hooped into a whole with a first carbon fiber cloth hoop (10.3); Step six, on the web bar (9), second carbon fiber cloth hoops (22) are arranged at intervals along the long axis. Step 7: a first strip groove (12) is formed on the front and rear side surfaces of the old upper chord rod (10.1) along the long axis of the old upper chord rod (10.1), and a second strip groove (19) is formed on the front and rear side surfaces of the web rod (9) along the long axis of the web rod (9); Step eight, placing a first carbon fiber plate (10.4) in the first strip-shaped groove (12), and placing a second carbon fiber plate (20) in the second strip-shaped groove (19); Step nine, sleeve the first steel sleeve (7.3) at the lower ends of the vertical support (7.1) and the diagonal support (7.2), fix the first steel sleeve head (7.6) at the top of the vertical support (7.1), and fix the second steel sleeve head (7.7) at the top of the diagonal support (7.2); sleeve the second steel sleeve (10.9) at the lower end of the upper chord (10), and sleeve a group of steel sleeve hoops (13) at intervals on the outer surface of the upper chord (10) along the long axis of the upper chord (10); at the same time, sleeve the third steel sleeve (23) at the bottom of the web bar (9), and sleeve the third steel sleeve head (24) at the upper end of the web bar (9); Step 10, hoisting and fixing the assembled components to be replaced; Step 11: Installation of the roof panel (4), the construction is now complete.

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