Wood grating body external string reinforcing structure and construction method thereof

Abstract

The invention relates to a wood grating body external string reinforcing structure and a construction method thereof. The structure comprises two bearing walls which are oppositely arranged; the plurality of wood grids are arranged between the two load-bearing walls at equal intervals in the length direction of the load-bearing walls; each reinforcing assembly comprises two end supports, two steel pull rods, two supporting components, a tensioning screw and two sets of tensioning adjusting nuts, the two end supports are arranged in the two bearing walls correspondingly and oppositely, and the two supporting components are arranged below the wood grating in parallel in the length direction of the bearing walls and abut against the wood grating; one ends of the two steel pull rods are connected with the two end supports respectively, the other ends of the two steel pull rods are connected with the two supporting components respectively, the two ends of the tensioning screw penetrate through the two supporting components respectively and then are locked through the tensioning adjusting nuts, and the two steel pull rods and the tensioning screw are located in the same vertical plane. In-situ reinforcement can be conducted on the wood grid, bolt holes do not need to be formed in the side face of the wood grid in advance, and the reinforcement mode is flexible and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of reinforcement of existing building structures, and in particular to an external string reinforcement structure of a wood grille and a construction method thereof. Background Art

[0002] Many areas have a large number of excellent existing buildings, either in Renaissance style or neoclassical with Baroque symbols, and the architectural style along the streets has historical protection value. The development of actual projects needs to be based on the principle of "recreating style and reshaping function", retaining the facades with cultural value and characteristic interior decoration and construction methods, with the focus on maintaining the architectural style of the area. Such buildings are generally multi-story houses with mixed structures mainly of brick and wood.

[0003] For brick-wood structures and wooden structures where wooden grilles are used as horizontal load-bearing components on the building floor, the building needs to be upgraded after a long period of service, which often leads to problems such as insufficient bending bearing capacity and deflection due to increased load requirements and the durability of the wooden grilles themselves. At this time, reinforcement is required as required. At present, the conventional method of reinforcing wooden grilles is to add channel steel, flat steel or angle steel to the side of the wooden grilles to increase the bearing capacity of the original wooden grilles, such as Figure 1-2 As shown, the principle of this type of reinforcement method is to use the newly added steel member 1 to reinforce the original wooden grille 2 to improve the bearing capacity of the wooden member, and through bolts 4 are required to connect the original wooden grille 2 with the newly added steel member 1 to ensure coordinated deformation and stress. However, this type of reinforcement method has the following shortcomings:

[0004] 1) In order to ensure that the additional steel members 1 such as angle steel can effectively cooperate with the original wooden grille 2 to bear force, it is necessary to open more bolt holes 3 on the original wooden grille 2 and perform bolt penetration connection. More pre-opened holes will cause certain structural damage to the original wooden grille 2;

[0005] 2) In a brick-wood structure, the spacing between the load-bearing wooden grilles on the floor is generally 300mm to 400mm. It is difficult to pre-drill the bolt holes 3 for the original wooden grilles 2 in situ at the construction site. The original wooden grilles 2 need to be dismantled as a whole before drilling holes. The amount of dismantling is large and poses certain risks to the lateral stability of the vertical load-bearing wall.

[0006] 3) The steel member 1 attached to the side is provided with a shelf end hole on the end load-bearing masonry wall according to the spacing of the original wooden grille 2. The load-bearing masonry wall at the floor elevation will be significantly damaged. If necessary support measures are not taken during the construction process, there will be safety hazards;

[0007] 4) When the side steel member 1 is used for reinforcement, the subsequent scissor bracing for ensuring the stability between the original wooden grilles 2 is difficult to construct, which may easily lead to out-of-plane instability of the wooden grilles;

[0008] 5) Due to its stress-bearing characteristics, each original wooden grille 2 needs to be reinforced, resulting in a large amount of steel used for reinforcement. In addition, the additional steel components 1 have a significant burden on the bearing capacity of adjacent vertical load-bearing components due to their own heavy weight. Summary of the invention

[0009] The object of the present invention is to provide a wooden grille external tensioning reinforcement structure and a construction method thereof, so as to at least solve one of the technical problems existing in the traditional wooden grille reinforcement method.

[0010] In order to achieve the above object, the present invention provides a wooden grille external tensioning reinforcement structure, comprising:

[0011] Two load-bearing walls arranged opposite to each other;

[0012] A plurality of wooden grilles are arranged at equal intervals between the two load-bearing walls along the length direction of the load-bearing wall, and two ends of the wooden grilles are respectively placed on the two load-bearing walls;

[0013] A plurality of reinforcement components are arranged between the two load-bearing walls, each of the reinforcement components includes two end supports, two steel tie rods, two supporting members, a tensioning screw and two sets of tensioning adjustment nuts. The two end supports are respectively arranged in the two load-bearing walls and arranged opposite to each other. The two supporting members are arranged parallel to the length direction of the load-bearing wall below the wooden grille and abut against the wooden grille. One ends of the two steel tie rods are respectively connected to the two end supports, and the other ends of the two steel tie rods are respectively connected to the two supporting members. The tensioning screw is arranged along a length direction perpendicular to the load-bearing wall and both ends respectively penetrate the two supporting members and are then locked by the tensioning adjustment nuts. The two steel tie rods and the tensioning screw are in the same vertical plane.

[0014] Optionally, a plurality of holes are partially opened on the load-bearing wall, and the end supports are installed in the holes.

[0015] Optionally, when the load-bearing wall is in the middle span, the end support is I-shaped, and when the load-bearing wall is in the side span, the end support is C-shaped.

[0016] Optionally, there are at least two holes on the load-bearing wall, and the distance between two adjacent holes is greater than the distance between two adjacent wooden grilles.

[0017] Optionally, a steel cage is tied inside the hole and filled with concrete.

[0018] Optionally, a connecting ear plate is provided on the end support, and one end of the steel pull rod is rotatably connected to the connecting ear plate via a pin.

[0019] Optionally, the supporting member is a double-jointed angle steel in a T-shaped support.

[0020] Based on the same technical concept, the present invention also provides a construction method of the above-mentioned wooden grille external tension string reinforcement structure, comprising the following steps:

[0021] A plurality of holes are correspondingly opened on the two load-bearing walls, and the end supports are installed in the holes;

[0022] Install all steel tie rods and connect one end of the steel tie rod to the end support;

[0023] Install two supporting members under the wooden grille, and connect the other end of the steel tie rod to the supporting member on the corresponding side;

[0024] A tensioning screw is installed between the two supporting members and a tensioning adjusting nut is adjusted to complete the reinforcement of the wooden grille.

[0025] Optionally, after all the steel tie rods are installed and before the supporting member is installed, the construction method further comprises:

[0026] A steel cage is tied in the hole and filled with concrete.

[0027] Optionally, after all the steel tie rods are installed and before the supporting member is installed, the construction method further comprises:

[0028] The load-bearing wall is reinforced with a cement mortar surface layer or a reinforced concrete slab wall.

[0029] The wooden grille external tension string reinforcement structure and the construction method thereof provided by the present invention have at least one of the following beneficial effects:

[0030] 1) There is no need to pre-drill bolt holes on the sides of the original wooden grille, which can solve the structural damage to the original wooden components and achieve the principle of minimum intervention;

[0031] 2) The wooden grille can be reinforced in situ without the need to remove the entire wooden grille, thus reducing the construction and demolition costs and temporary construction measures costs;

[0032] 3) The construction is simple. During the reinforcement process, only local holes need to be opened at the anchorage of the steel tie rod end. The hole spacing is expanded from 300mm to 400mm in the traditional reinforcement method to 2000mm to 3000mm, which solves the problem of major damage to the load-bearing wall.

[0033] 4) The reinforcement method is more flexible. When the subsequent building function requirements are higher, it is only necessary to open operation holes locally to supplement steel tie rods, without the need to dismantle the floor surface and floor ceiling;

[0034] 5) The cost is low. By taking advantage of the excellent tensile properties of steel, the amount of steel used is significantly optimized, and the temporary support costs caused by local openings in the wall can be significantly reduced;

[0035] 6) In accordance with the principle of minimum intervention and reversibility, this reinforcement method can be applied to excellent historical protection (cultural relics protection) buildings to effectively avoid the impact of intervention on the original building structure and achieve respect for historical buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Those skilled in the art should understand that the drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0037] Figure 1 It is a schematic diagram of the structure of using angle steel to reinforce wooden grille in the prior art;

[0038] Figure 2 It is a side view of the use of angle steel to reinforce the wooden grille in the prior art;

[0039] Figure 3 A schematic structural diagram of a wooden grille external tensioned string reinforcement structure provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of opening a hole in a load-bearing wall provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of installing a steel tie rod on a load-bearing wall in the middle span provided by an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of installing a steel tie rod on a load-bearing wall at a side span provided by an embodiment of the present invention;

[0043] Figure 7-Figure 8 A schematic diagram of reinforcing the surface layer of a load-bearing wall provided by an embodiment of the present invention;

[0044] Fig. 9 A diagram showing deformation simulation results of a wooden grille before reinforcement provided by an embodiment of the present invention;

[0045] Fig.10 A diagram showing the bending moment simulation results before reinforcement of a wood grille provided by an embodiment of the present invention;

[0046] Fig.11 A diagram showing deformation simulation results after reinforcement of a wooden grille according to an embodiment of the present invention;

[0047] Fig.12 A diagram showing the bending moment simulation results after the wood grille is reinforced according to an embodiment of the present invention;

[0048] Fig.13 The stress simulation result of the pin on the end support provided by one embodiment of the present invention;

[0049] Fig.14 The displacement simulation result of the end support provided by one embodiment of the present invention;

[0050] Fig.15 The simulation result of the out-of-plane shear stress of the wall provided by an embodiment of the present invention;

[0051] Fig.16 The simulation result of the out-of-plane deformation of the wall provided by one embodiment of the present invention.

[0052] in:

[0053] 1-Steel member; 2-Original wooden grille; 3-Bolt hole; Through bolt;

[0054] 100-load-bearing wall; 101-hole; 200-wood grille; 301-end support; 302-steel tie rod; 303-support member; 304-tensioning screw; 305-tensioning adjustment nut; 306-horizontal steel reinforcement belt; 307-connecting ear plate. DETAILED DESCRIPTION

[0055] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change in the proportional relationship or adjustment of the size, under the same or similar conditions as the effects that can be produced by the present invention and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0056] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, unless the content clearly indicates otherwise. As used in the present invention, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. As used in the present invention, the term "several" is generally used in a sense that includes "at least one", unless the content clearly indicates otherwise. As used in the present invention, the term "at least two" is generally used in a sense that includes "two or more", unless the content clearly indicates otherwise. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Please refer to Figure 3-Figure 6 The embodiment of the present invention provides a wooden grille external tensioning reinforcement structure, comprising:

[0059] Two load-bearing walls 100 arranged opposite to each other;

[0060] A plurality of wooden grilles 200 are arranged at equal intervals between two load-bearing walls 100 along the length direction of the load-bearing wall 100, and two ends of the wooden grilles 200 are placed on the two load-bearing walls 100 respectively;

[0061] A plurality of reinforcement components are arranged between two load-bearing walls 100, each reinforcement component includes two end supports 301, two steel tie rods 302, two supporting members 303, a tensioning screw 304 and two tensioning adjustment nuts 305. The two end supports 301 are respectively arranged in the two load-bearing walls 100 and arranged relatively to each other. The two supporting members 303 are arranged in parallel below the wooden grille 200 along the length direction of the load-bearing wall 100 and abut against the wooden grille 200. One ends of the two steel tie rods 302 are respectively connected to the two end supports 301, and the other ends of the two steel tie rods 302 are respectively connected to the two supporting members 303. The tensioning screw 304 is arranged along the length direction perpendicular to the load-bearing wall 100 and the two ends are respectively passed through the two supporting members 303 and then locked by the tensioning adjustment nuts 305. The two steel tie rods 302 and the tensioning screw 304 are in the same vertical plane.

[0062] This embodiment utilizes the supporting member 303 to reduce the calculated force span of the wooden grille 200, and the installation angle of the steel tie rod 302 can be adjusted by adjusting the position of the supporting member 303, thereby controlling the relative proportion of the horizontal support reaction force and the vertical support reaction force of the end support 301, ensuring that the load-bearing walls 100 on both sides mainly bear the vertical load, and the supporting members 303 are tensioned by the tensioning adjustment nut at the end of the tensioning screw 304 to support the reinforced wooden grille 200, thereby effectively transmitting the load borne by the original wooden grille 200. This external tensioning reinforcement structure is highly flexible and can reinforce the original wooden grille 200 in situ without dismantling the wooden grille 200 or pre-opening bolt holes on the side of the wooden grille 200, thereby solving the problem of structural damage to the original wooden components and realizing the principle of minimum intervention.

[0063] In this embodiment, the load-bearing wall 100 is a load-bearing wall of a building structure, such as a masonry wall. A plurality of holes 101 are partially opened on the load-bearing wall 100 , and the end supports 301 are installed in the holes 101 .

[0064] In this embodiment, when the load-bearing wall 100 is in the middle span, the end support 301 is an I-shaped one. Figure 5 As shown, at this time, holes 101 for installing end supports 301 can be opened on both sides of the load-bearing wall 100; when the load-bearing wall 100 is in the side span, the end support 301 is C-shaped, as shown in 6.

[0065] Preferably, there are at least two holes 101 on the load-bearing wall 100, and the distance between two adjacent holes 101 is greater than the distance between two adjacent wooden grilles 200. Such a design can reduce the number of holes on the load-bearing wall 100 and reduce the span of the wooden grilles 200. The distance between the holes 101 can be expanded from 300mm to 400mm in the traditional reinforcement method to 2000mm to 3000mm, thereby avoiding major damage to the load-bearing wall.

[0066] In addition, it can be determined whether it is necessary to use cement mortar surface reinforcement or reinforced concrete slab wall reinforcement for the load-bearing wall according to the actual situation. When the load-bearing wall adopts the corresponding reinforcement method, a horizontal steel reinforcement strip 306 is set in the elevation area where the hole 101 is opened, such as Figure 7-Figure 8 As shown, the spacing between holes 101 can be further expanded to more than 3000 mm.

[0067] Preferably, a steel cage is tied inside the hole 101 and filled with concrete to increase the horizontal friction coefficient between the end support 301 and the load-bearing wall, prevent the end support 301 from being pulled out of the wall by force, and form a complete reinforcement system.

[0068] In this embodiment, one end of the steel tie rod 302 is connected to the end support 301, and the other end is connected to the supporting member 303. That is, the steel tie rod 302 is connected to the supporting member 303 at a certain angle and extends to the end support 301. Therefore, the installation angle of the steel tie rod 302 can be adjusted by adjusting the position of the supporting member 303, thereby controlling the ratio of the horizontal support reaction force and the vertical support reaction force of the end support 301.

[0069] Preferably, a connecting ear plate 307 is provided on the end support 301, and one end of the steel pull rod 302 is rotatably connected to the connecting ear plate 307 through a pin.

[0070] Preferably, the supporting member 303 is a double-jointed angle steel in a T-shaped support. Of course, other supporting members 303 well known to those skilled in the art may also be used, and the present application does not impose any limitation on this.

[0071] Based on the same technical concept, the embodiment of the present invention also provides a construction method of the above-mentioned wooden grille external tension string reinforcement structure, comprising the following steps:

[0072] S1. Open a number of holes 101 on two load-bearing walls 100, and install the end supports 301 in the holes 101;

[0073] S2, install all the steel tie rods 302, and connect one end of the steel tie rod 302 to the end support 301;

[0074] S3, installing two supporting members 303 under the wooden grille 200, and connecting the other end of the steel tie rod 302 to the supporting member 303 on the corresponding side;

[0075] S4. Install the tensioning screw 304 between the two supporting members 303 and adjust the tensioning adjusting nut 305 to complete the reinforcement of the wooden grille 200.

[0076] First, execute S1, open a number of holes 101 on the two load-bearing walls 100, and install the end supports 301 in the holes 101. In this embodiment, the distance between two adjacent holes 101 is greater than the distance between two adjacent wood grilles 200, so as to reduce the number of holes 101 on the load-bearing wall 100 and reduce the span of the wood grilles 200. When the load-bearing wall 100 is in the middle span, the end support 301 is an I-shaped, such as Figure 5 As shown, at this time, holes 101 for installing end supports 301 can be opened on both sides of the load-bearing wall 100; when the load-bearing wall 100 is in the side span, the end support 301 is C-shaped, as shown in 6.

[0077] Then, S2 is executed to install all the steel tie rods 302, and one end of the steel tie rod 302 is connected to the end support 301. In this embodiment, a connecting ear plate 307 is provided on the end support 301, and one end of the steel tie rod 302 is rotatably connected to the connecting ear plate 307 through a pin shaft.

[0078] Preferably, before executing S3, the construction method further includes:

[0079] A steel cage is tied inside the hole 101 and filled with concrete.

[0080] Furthermore, before executing S3, the construction method further includes:

[0081] The surface layer of the load-bearing wall 100 is reinforced.

[0082] Then execute S3, install two supporting members 303 under the wooden grille 200, connect the other end of the tie rod to the supporting member 303 on the corresponding side, and the steel tie rod 302 is connected to the supporting member 303 at a certain angle and extends to the end support 301. Therefore, by adjusting the position of the supporting member 303, the installation angle of the steel tie rod 302 can be adjusted, thereby controlling the ratio of the horizontal support reaction force to the vertical support reaction force of the end support 301.

[0083] Finally, S4 is executed to install the tensioning screw 304 between the two supporting members 303 and adjust the tensioning adjustment nut 305 to ensure that the load-bearing walls 100 on both sides mainly bear the vertical load and the steel tie rod 302 mainly bears the axial tension, thereby effectively transferring the load borne by the log grille 200 to complete the reinforcement of the log grille 200.

[0084] Take a single unit as an example. The original size of the log grille 200 of the floor is 75×300mm, the spacing is 400mm, the minimum calculated span of the log grille is 4.9m, the maximum is 5.9m, and the wood strength grade is TC11A; the brick strength grade of the existing load-bearing wall is MU10, and the mortar strength grade is M2.8. After the renovation, the building function is commercial, and the design live load is required to reach 4.0kN / m2 (ie 400 kg per square meter).

[0085] First, the main stress indicators of the original wooden grille 200 are reviewed according to the subsequent use requirements. Its deformation and bending bearing capacity do not meet the subsequent use requirements. The deformation and bending moment simulation results of the wooden grille 200 are shown in Figure 9- Fig.10 shown.

[0086] After the wooden grille 200 is reinforced by the external tensioning reinforcement method of the wooden grille provided by the embodiment of the present invention, the deformation and bending bearing capacity are reduced from the original maximum of 56.5 mm and 21.05 kN·m to 10.8 mm and 4.10 kN·m, which meets the subsequent use requirements. The deformation and bending moment simulation results of the wooden grille 200 are shown in Figure 11- Fig.12 shown.

[0087] It should be noted that when strengthening the external string of the wooden grille, it is necessary to conduct a stress analysis according to the actual situation to determine whether the end support 301 can meet the shear resistance requirements of the wall. The analysis needs to be carried out in the following two steps:

[0088] 1) Extract the axial force of the steel tie rod 302, perform finite element analysis on the end anchor node (the boundary condition of the end support 301 uses the elastic modulus of concrete as the spring constant, and the contact stress between the pin and the connecting ear plate 307 is positive when it is compressed, and failure occurs when it is tensile). According to the calculation results, the size and material model of the pin are determined. The stress simulation results of the pin are as follows: Fig.13 As shown, the displacement simulation results of the end support 301 are as follows Fig.14 shown.

[0089] 2) Since the shear strength of the masonry load-bearing wall 100 is relatively low, the approximate size of the end support 301 needs to be calculated in combination with the shear strength of the load-bearing wall 100 and the reaction force of the end support 301 after the wood grille 200 is reinforced; on the premise that the bearing capacity and deformation of the reinforced wood grille 200 meet the design requirements, the position of the supporting member 303 is adjusted to minimize the horizontal component of the end support 301. The out-of-plane shear stress results and out-of-plane deformation results of the wall are as follows: Figure 15-16 shown.

[0090] In summary, the embodiment of the present invention provides an external tensioned reinforcement structure of a wooden grille and a construction method thereof, wherein the support member 303 is used to reduce the calculated force span of the wooden grille 200, and the installation angle of the steel tie rod 302 can be adjusted by adjusting the position of the support member 303, thereby controlling the relative proportion of the horizontal support reaction force and the vertical support reaction force of the end support 301, thereby ensuring that the load-bearing walls 100 on both sides mainly bear the vertical load, and the support members 303 are tensioned by the tensioning adjustment nuts at the ends of the tensioning screws 304 to abut against and support the reinforced wooden grille 200, thereby effectively transmitting the load borne by the original wooden grille 200, and this external tensioned reinforcement structure is highly flexible, and can reinforce the original wooden grille 200 in situ, without the need to dismantle the wooden grille 200 or pre-open bolt holes on the sides of the wooden grille 200, thereby solving the problem of structural damage to the original wooden components and realizing the principle of minimum intervention.

[0091] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of protection of the technical solution of the present invention.

Claims

1. A wooden grille external tensioning reinforcement structure, characterized in that: include: Two load-bearing walls arranged opposite to each other; A plurality of wooden grilles are arranged at equal intervals between the two load-bearing walls along the length direction of the load-bearing wall, and two ends of the wooden grilles are respectively placed on the two load-bearing walls; A plurality of reinforcement components are arranged between the two load-bearing walls, each of the reinforcement components includes two end supports, two steel tie rods, two supporting members, a tensioning screw and two sets of tensioning adjustment nuts. The two end supports are respectively arranged in the two load-bearing walls and arranged opposite to each other. The two supporting members are arranged parallel to the length direction of the load-bearing wall below the wooden grille and abut against the wooden grille. One ends of the two steel tie rods are respectively connected to the two end supports, and the other ends of the two steel tie rods are respectively connected to the two supporting members. The tensioning screw is arranged along a length direction perpendicular to the load-bearing wall and both ends respectively penetrate the two supporting members and are then locked by the tensioning adjustment nuts. The two steel tie rods and the tensioning screw are in the same vertical plane.

2. The wooden grille external tension string reinforcement structure according to claim 1 is characterized in that: A plurality of holes are partially opened on the load-bearing wall, and the end supports are installed in the holes.

3. The wooden grille external tensioning structure according to claim 2 is characterized in that: When the load-bearing wall is in the middle span, the end support is I-shaped, and when the load-bearing wall is in the side span, the end support is C-shaped.

4. The wooden grille external tensioning structure according to claim 2 is characterized in that: There are at least two holes in the load-bearing wall, and the distance between two adjacent holes is greater than the distance between two adjacent wooden grilles.

5. The wooden grille external tension string reinforcement structure according to claim 2, characterized in that: A steel cage is tied inside the hole and filled with concrete.

6. The wooden grille external tension string reinforcement structure according to claim 1, characterized in that: The end support is provided with a connecting ear plate, and one end of the steel pull rod is rotatably connected to the connecting ear plate through a pin shaft.

7. The wood grille external tensioning structure according to claim 1 is characterized in that: The supporting member is a double-jointed angle steel in a T-shaped support.

8. A construction method for a wood grille external tensioned string reinforcement structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: A plurality of holes are correspondingly opened on the two load-bearing walls, and the end supports are installed in the holes; Install all steel tie rods and connect one end of the steel tie rod to the end support; Install two supporting members under the wooden grille, and connect the other end of the steel tie rod to the supporting member on the corresponding side; A tensioning screw is installed between the two supporting members and a tensioning adjusting nut is adjusted to complete the reinforcement of the wooden grille.

9. The construction method of the wooden grille external tension string reinforcement structure according to claim 8 is characterized in that: After all the steel tie rods are installed and before the support members are installed, the construction method further comprises: A steel cage is tied in the hole and filled with concrete.

10. The construction method of the wooden grille external tension string reinforcement structure according to claim 8, characterized in that: After all the steel tie rods are installed and before the support members are installed, the construction method further comprises: The load-bearing wall is reinforced with a cement mortar surface layer or a reinforced concrete slab wall.

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