Reinforcing structure for wooden roof truss of building

Abstract

The utility model discloses a reinforcing structure for a wooden roof frame of a building, relates to the technical field of reinforcing engineering of traditional wooden roof frames, and aims to solve the problem that at least one of the sense of history of the building and the increase of engineering cost cannot be reserved during reinforcing of a wooden roof in the prior art. The reinforcing structure comprises a lower chord prestressed pull rod and a vertical web prestressed pull rod, the lower chord prestress pull rod is arranged along the lower chord, the end of the lower chord prestress pull rod is fixedly connected with the lower chord of the wooden roof truss, and prestress is applied to the lower chord through the lower chord prestress pull rod; the vertical web prestress pull rods are arranged along the vertical web members, the ends of the vertical web prestress pull rods are fixedly connected with the vertical web members of the wooden roof truss, and prestress is applied to the vertical web members through the vertical web prestress pull rods. The reinforcing device can be used for reinforcing the wooden roof truss of the building.

Description

Technical Field

[0001] The utility model relates to the technical field of reinforcement engineering of traditional wooden roof frames, in particular to a reinforcement structure used for wooden roof frames of buildings. Background Art

[0002] The reinforcement of wooden roof trusses of buildings usually adopts the method of repairing partially damaged components and replacing seriously damaged components.

[0003] However, if the roof load increases and the bearing capacity needs to be improved, it can only be demolished and rebuilt. This approach not only fails to preserve the historical vicissitudes of the building, but also causes waste of materials and increases the cost of the project. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide a reinforcement structure for a wooden roof truss of a building, so as to solve at least one of the problems in the prior art that the wooden roof reinforcement not only fails to preserve the historical vicissitudes of the building, but also increases the project cost.

[0005] The purpose of the utility model is mainly achieved through the following technical solutions.

[0006] The utility model provides a reinforcement structure for a wooden roof truss of a building, comprising a lower chord prestressed tie rod and a vertical web prestressed tie rod;

[0007] The lower chord prestressed tie rod is arranged along the lower chord rod and the end of the lower chord prestressed tie rod is fixedly connected to the lower chord rod of the wooden roof frame, and prestress is applied to the lower chord rod through the lower chord prestressed tie rod;

[0008] The vertical web prestressed tie rods are arranged along the vertical web bars and the ends of the vertical web prestressed tie rods are fixedly connected to the vertical web bars of the wooden roof frame, and prestress is applied to the vertical web bars through the vertical web prestressed tie rods.

[0009] Furthermore, the vertical web members are divided into a central vertical web member located at the center of the wooden roof frame and side vertical web members located at both sides of the central vertical web member.

[0010] Furthermore, the central vertical web member corresponds to four vertical web prestressed tension rods.

[0011] Furthermore, two vertical web prestressed tie rods are arranged on the front end surface of the central vertical web member, and two vertical web prestressed tie rods are arranged on the rear end surface of the central vertical web member.

[0012] Furthermore, each side vertical web member corresponds to two vertical web prestressed tension rods.

[0013] Furthermore, one of the vertical web prestressed tie rods is located on a side of the side vertical web member away from the central vertical web member, and the other vertical web prestressed tie rod is located on a side of the side vertical web member toward the central vertical web member.

[0014] Furthermore, the reinforcement structure also includes an end node plate, and the end of the lower chord prestressed tie rod, the upper chord rod and the lower chord rod are fixedly connected through the end node plate.

[0015] Furthermore, the reinforcement structure also includes a lower chord node plate, and the lower end of the vertical web prestressed tie rod, the lower chord rod and the vertical web rod are fixedly connected through the lower chord node plate.

[0016] Furthermore, the reinforcement structure also includes an upper chord node plate, and the upper ends of the vertical web prestressed tension rods, the upper chord rods and the vertical web rods are fixedly connected through the upper chord node plate.

[0017] Furthermore, the upper end of the vertical web prestressed tie rod is connected to the upper chord node plate through a tensioning nut.

[0018] Compared with the prior art, the utility model can achieve at least one of the following beneficial effects.

[0019] The reinforcement structure for the wooden roof truss of a building provided by the utility model is provided with a lower chord prestressed tie rod and a vertical web prestressed tie rod on the basis of the wooden roof truss, the lower chord is prestressed and reinforced by the lower chord prestressed tie rod, and the vertical web is prestressed and reinforced by the vertical web prestressed tie rod, and the prestress applied by the lower chord prestressed tie rod and the vertical web prestressed tie rod is adjusted so that the tension on the lower chord and the vertical web is reduced or even zero, thereby effectively reducing or even avoiding further damage to the lower chord and the vertical web caused by the tension, and on the premise of not replacing or replacing as little as possible the wood of the wooden roof truss, the overall bearing capacity of the wooden roof truss is improved, and the safety hazards existing in the wooden roof truss are eliminated.

[0020] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0022] Figure 1a A schematic structural diagram of a reinforcement structure for a building wooden roof frame provided by the utility model, wherein the original structure of the wooden roof frame is shown;

[0023] Figure 1b A schematic diagram of the positions of the prestressed adjusting rod and the lower chord prestressed tension rod in the reinforcement structure for the wooden roof truss of a building provided by the present invention;

[0024] Figure 1c for Figure 1b AA section view;

[0025] Figure 2a A schematic diagram of the position of the end node plate in the reinforcement structure for the wooden roof truss of a building provided by the present invention;

[0026] Figure 2b A schematic diagram of the position of the lower chord node plate in the reinforcement structure for the wooden roof truss of a building provided by the present invention;

[0027] Figure 2c A schematic diagram of the position of an upper chord node plate in a reinforcement structure for a building wooden roof truss provided by the present invention.

[0028] Reference numerals:

[0029] 1-upper chord; 2-lower chord; 3-vertical web; 4-lower chord prestressed tie rod; 5-vertical web prestressed tie rod; 6-end node plate; 7-lower chord node plate; 8-upper chord node plate; 9-prestressed adjustment rod. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] Embodiment 1

[0032] This embodiment provides a reinforcement structure for a wooden roof truss of a building, see Figure 1a , including a lower chord prestressed rod 4 and a vertical web prestressed rod 5. The lower chord prestressed rod 4 is arranged along the lower chord rod 2, placed at the lower part of the lower chord rod 2 and fixedly connected to the lower chord rod 2. Prestress is applied to the lower chord rod 2 through the lower chord prestressed rod 4. One end of the lower chord prestressed rod 4 is fixedly connected to the lower chord rod 2, and the other end of the lower chord prestressed rod 4 is fixedly connected to the other end of the lower chord rod 2. The vertical web prestressed rod 5 is arranged along the vertical web rod 3 and fixedly connected to the vertical web rod 3. Prestress is applied to the vertical web rod 3 through the vertical web prestressed rod 5.

[0033] It should be noted that the wooden roof frame includes an upper chord 1 , a lower chord 2 and a vertical web member 3 . Two upper chords 1 and one lower chord 2 are connected to form a triangle. The vertical web member 3 is located between the upper chord 1 and the lower chord 2 .

[0034] The prestress of the lower chord prestressing rod 4 and the vertical web prestressing rod 5 is adjusted, and the lower chord rod 2 and the vertical web rod 3 are subjected to pressure, under the premise of only considering the gravity of the wooden roof frame. In actual use, the lower chord rod 2 and the vertical web rod 3 will also bear the roof load, so that the lower chord rod 2 and the vertical web rod 3 change from bearing pressure to not bearing force or bearing a small tension.

[0035] Compared with the prior art, the reinforcement structure for the wooden roof truss of a building provided in the present embodiment is provided with a lower chord prestressed tie rod 4 and a vertical web prestressed tie rod 5 on the basis of the wooden roof truss, and the lower chord 2 is prestressed and reinforced by the lower chord prestressed tie rod 4, and the vertical web 3 is prestressed and reinforced by the vertical web prestressed tie rod 5. By adjusting the prestress applied by the lower chord prestressed tie rod 4 and the vertical web prestressed tie rod 5, the tension on the lower chord 2 and the vertical web 3 is reduced or even zero, thereby effectively reducing or even avoiding further damage to the lower chord 2 and the vertical web 3 caused by the tension. On the premise of not replacing or replacing as little as possible the wood of the wooden roof truss, the overall bearing capacity of the wooden roof truss is improved, and the safety hazards of the wooden roof truss are eliminated.

[0036] As for the setting position of the lower chord prestressed tension rod 4 , illustratively, the lower chord prestressed tension rod 4 is located below the lower chord rod 2 .

[0037] Correspondingly, for the setting position of the vertical prestressed tie rods 5, the vertical tie rods 3 are divided into a central vertical tie rod 3 located at the center of the wooden truss and side vertical tie rods 3 located on both sides of the central vertical tie rod 3. The central vertical tie rod 3 corresponds to 4 vertical prestressed tie rods 5, 2 vertical prestressed tie rods 5 are arranged on the front end surface of the central vertical tie rod 3, and 2 vertical prestressed tie rods 5 are arranged on the rear end surface of the central vertical tie rod 3. Each side vertical tie rod 3 corresponds to 2 vertical prestressed tie rods 5, one of the vertical prestressed tie rods 5 is located on the side of the side vertical tie rod 3 away from the central vertical tie rod 3, and the other vertical prestressed tie rod 5 is located on the side of the side vertical tie rod 3 toward the central vertical tie rod 3, thereby forming a symmetrical structure to ensure the uniformity of the overall reinforcement force of the wooden truss.

[0038] In order to further offset the deformation of the wooden truss, a brace (e.g., a round steel tube) is provided between the lower chord prestressed tie rod 4 and the lower chord 2. The lower chord prestressed tie rod 4 is in close contact with the lower chord 2 through the brace. For example, the position of the brace corresponds to the intersection of the vertical web member 3 and the lower chord 2. Under the premise of only considering the gravity of the wooden truss, the prestress of the lower chord prestressed tie rod 4 is adjusted so that the lower chord prestressed tie rod 4 props up part of the lower chord 2 through the brace to form an anti-arch. In this way, in actual use, the wooden truss will also bear the roof dead load, and the anti-arch structure can further offset the deformation of the wooden truss.

[0039] It is worth noting that the stability of the connection structure between the upper chord 1, the lower chord 2 and the vertical web 3 will also affect the overall bearing capacity of the original roof. Therefore, the reinforcement structure for the building wooden roof frame also includes an end node plate 6, a lower chord node plate 7 and an upper chord node plate 8, see Figure 2a , Figure 2b and Figure 2c .

[0040] Among them, the end node refers to the connection node between the upper chord 1 and the lower chord 2, the end node plate 6 is located at the connection node between the upper chord 1 and the lower chord 2, the end node plate 6 is used to reinforce the connection node between the upper chord 1 and the lower chord 2, the end of the lower chord prestressed rod 4, the upper chord 1 and the lower chord 2 are fixedly connected through the end node plate 6, during the service of the above-mentioned wooden truss, the two ends of the lower chord prestressed rod 4 are connected to the end node plate 6, and the tension of the lower chord prestressed rod 4 is transmitted to the end node plate 6.

[0041] The lower chord node refers to the connection node between the vertical web member 3 and the lower chord member 2. The lower chord node plate 7 is located at the connection node between the vertical web member 3 and the lower chord member 2, and is used to reinforce the connection node between the vertical web member 3 and the lower chord member 2. The lower end of the vertical web prestressed tension rod 5, the lower chord member 2 and the vertical web member 3 are fixedly connected by the lower chord node plate 7.

[0042] The upper chord node refers to the connection node between the vertical web member 3 and the upper chord member 1. The upper chord node plate 8 is located at the connection node between the vertical web member 3 and the upper chord member 1, and is used to reinforce the connection node between the vertical web member 3 and the upper chord member 1. The upper end of the vertical web prestressed tension rod 5, the upper chord member 1 and the vertical web member 3 are fixedly connected by the upper chord node plate 8.

[0043] It should be noted that the upper end of the vertical web prestressed tie rod 5 is connected to the upper chord node plate 8 via a tensioning nut.

[0044] In this way, on the one hand, through the arrangement of the end node plates 6, the lower chord node plates 7 and the upper chord node plates 8, the upper chord rods 1, the lower chord rods 2, the vertical web members 3, the lower chord prestressed tie rods 4 and the vertical web prestressed tie rods 5 can be connected to form a whole, thereby ensuring the stability of the overall structure of the wooden truss; on the other hand, the connections between the vertical web members 3, the upper chord rods 1 and the lower chord rods 2 are mostly mortise and tenon joints or climbing nail connections, which are prone to deformation and rod detachment under the action of tension, posing a major safety hazard. Through the arrangement of the end node plates 6, the lower chord node plates 7 and the upper chord node plates 8, each node can be effectively reinforced, thereby further improving the bearing capacity of the above-mentioned reinforcement structure for the wooden truss of the building.

[0045] Similarly, in order to improve the connection stability of the two upper chords 1, the above-mentioned reinforcement structure for the wooden roof truss of the building also includes a U-shaped plate. The two upper chords 1 are fixedly connected by the U-shaped plate. The connection nodes of the two upper chords 1 are reinforced by the U-shaped plate to ensure the strength of the connection nodes of the two upper chords 1 and absorb the axial force of the upper chord 1 and the lower chord 2.

[0046] It is worth noting that when it snows in winter, the wooden truss will bear additional snow loads, but in summer, there is no need to consider snow loads. In order to be able to appropriately and adaptively adjust the prestress applied by the lower chord prestressing rod 4, the prestressed reinforced wooden truss also includes a prestressing adjusting rod 9, see Figure 1b to Figure 1c, the linear expansion coefficient of the prestressed adjusting rod 9 is greater than the linear expansion coefficient of the lower chord prestressed rod 4, the prestressed adjusting rod 9 is arranged along the direction of the lower chord prestressed rod 4, and the two ends of the prestressed adjusting rod 9 are fixedly connected to the lower chord prestressed rod 4 through the locking clips 20. In this way, by setting the prestressed adjusting rod 9, and the linear expansion coefficient of the prestressed adjusting rod 9 is greater than the linear expansion coefficient of the lower chord prestressed rod 4, the thermal expansion and contraction characteristics of the prestressed adjusting rod 9 are utilized. In summer, the prestressed adjusting rod 9 does not apply prestress to the lower chord prestressed rod 4. In winter, the prestressed adjusting rod 9 shrinks itself and applies prestress to the lower chord prestressed rod 4, so that the prestress applied to the lower chord rod 2 increases, thereby being able to offset part or all of the snow load.

[0047] For example, the material of the lower chord prestressed tie rod 4 is steel, and the thermal expansion coefficient of the steel bar is 11.7×10 -6 m / m·℃, the material of the prestressed adjusting rod 9 is aluminum alloy, and the linear expansion coefficient of aluminum alloy is 23.8×10 -6 m / m·℃.

[0048] There are two prestressed adjusting rods 9; one of the prestressed adjusting rods 9 is close to one end of the lower chord prestressed tension rod 4, and the other prestressed adjusting rod 9 is close to the other end of the lower chord prestressed tension rod 4.

[0049] In order to make full use of the thermal expansion and contraction characteristics of the prestressing rod 9 to further increase the prestress applied to the lower chord 2, the length of the prestressing rod 9 should not be too short, and it is recommended to be no less than 1 m.

[0050] In practical applications, taking a specific wooden truss and reinforced structure as an example, the span of the wooden truss is 10m, the mid-span height is 3m, the roof dead load is 10KN / m, the roof live load is 2KN / m, the prestress applied by the lower chord prestressed tie rod is 50KN, and the prestress applied by the vertical web prestressed tie rod is 10KN. Under the premise of only considering the prestress and the gravity of the wooden truss, the pressure generated by the lower chord is 48.3KN, and the prestress of the lower chord prestressed tie rod is completely balanced by the lower chord of the wooden truss; the pressure generated by the central vertical web rod is 16.7KN, and the pressure generated by the side vertical web rod is 9~11KN, that is, the prestress of the vertical web prestressed tie rod is completely balanced by the vertical web rod of the wooden truss. The lower chord rod produces an upward anti-arch of 1.8mm.

[0051] Under the same load, calculations show that when the reinforcement structure is used for the wooden roof truss of a building, the tension of the lower chord is 30% of that without the reinforcement structure, the tension of the center vertical web is 46% of that without the reinforcement structure, and the tension of the side vertical web is 26% of that without the reinforcement structure. The addition of prestress greatly reduces the stress on the lower chord and vertical web of the wooden truss. Prestressed reinforcement improves the vertical displacement of the wooden truss, and the calculated result is only 65% ​​of that of the wooden truss. Prestressed reinforcement does not increase the stress on the upper chord.

[0052] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A reinforcement structure for a wooden roof truss of a building, characterized in that: It includes lower chord prestressed tie rods and vertical web prestressed tie rods; The lower chord prestressed tie rod is arranged along the lower chord rod, and the end of the lower chord prestressed tie rod is fixedly connected to the lower chord rod of the wooden roof frame, and prestress is applied to the lower chord rod through the lower chord prestressed tie rod; The vertical web prestressed tie rods are arranged along the vertical web bars, and the ends of the vertical web prestressed tie rods are fixedly connected to the vertical web bars of the wooden roof frame, and prestress is applied to the vertical web bars through the vertical web prestressed tie rods.

2. The reinforcement structure for a building wooden roof truss according to claim 1, characterized in that: The vertical web members are divided into a central vertical web member located at the center of the wooden roof frame and side vertical web members located at both sides of the central vertical web member.

3. The reinforcement structure for a building wooden roof truss according to claim 2, characterized in that: The central vertical web member corresponds to four vertical web prestressed tension rods.

4. The reinforcement structure for a building wooden roof truss according to claim 3, characterized in that: Two vertical web prestressed tie rods are arranged on the front end surface of the central vertical web member, and two vertical web prestressed tie rods are arranged on the rear end surface of the central vertical web member.

5. The reinforcement structure for a building wooden roof truss according to claim 2, characterized in that: Each side vertical web member corresponds to 2 vertical web prestressed tension rods.

6. The reinforcement structure for a building wooden roof truss according to claim 5, characterized in that: One of the vertical web prestressed tie rods is located on the side of the side vertical web member away from the central vertical web member, and the other vertical web prestressed tie rod is located on the side of the side vertical web member toward the central vertical web member.

7. The reinforcement structure for a building wooden roof truss according to claim 1, characterized in that: The reinforcement structure further comprises an end node plate, and the end of the lower chord prestressed tie rod, the upper chord rod and the lower chord rod are fixedly connected via the end node plate.

8. The reinforcement structure for a building wooden roof truss according to claim 1, characterized in that: The reinforcement structure further comprises a lower chord node plate, through which the lower ends of the vertical web prestressed tension rods, the lower chord rods and the vertical web rods are fixedly connected.

9. The reinforcement structure for a building wooden roof truss according to claim 1, characterized in that: The reinforcement structure further comprises an upper chord node plate, and the upper ends of the vertical web prestressed tension rods, the upper chord rods and the vertical web rods are fixedly connected via the upper chord node plate.

10. The reinforcement structure for a building wooden roof truss according to claim 9, characterized in that: The upper end of the vertical web prestressed tie rod is connected to the upper chord node plate through a tensioning nut.

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