Construction and design method of staggered caulked stone masonry wall reinforcing structure

Abstract

The application relates to a construction and design method of a staggered joint type stone masonry wall reinforcing structure, which comprises the following steps: chiseling a groove with an X-shaped profile along a mortar joint on one side of a stone masonry wall; pressing and smearing polymer mortar into the groove; embedding a plurality of L-shaped steel plates and T-shaped steel plates into the groove filled with the polymer mortar before initial setting of the polymer mortar, and the plurality of L-shaped steel plates and T-shaped steel plates are arranged in a staggered mode to form X-shaped steel plates; smearing polymer mortar on one side of the stone masonry wall to form a polymer mortar surface layer, and the polymer mortar surface layer covers all the L-shaped steel plates and T-shaped steel plates; the L-shaped steel plates and T-shaped steel plates embedded in the mortar joint of the stone masonry block can effectively improve the overall lateral resistance of the stone masonry wall; the stone masonry wall, the steel plates and the mortar surface layer are organically formed into a stress whole; and the X-shaped staggered joint reinforcing arrangement scheme can further efficiently improve the overall lateral resistance of the stone masonry wall.

Description

Technical Field

[0001] This invention relates to the field of civil engineering, specifically to a construction and design method for an interlocking jointed stone masonry wall reinforcement structure. Background Technology

[0002] In some buildings, due to limitations in design theory, building materials, and construction conditions at the time, the building materials, construction quality, structural seismic bearing capacity, and construction methods used do not meet the requirements of current standards, which greatly affects the safety of the structure. The mortar strength of many walls is too low, and the walls must be reinforced before they can continue to be used.

[0003] For example, Chinese patent CN102392542A, published on March 28, 2012, discloses a method for unilateral reinforcement and seismic strengthening of existing masonry structures. By adding steel mesh to one side of the wall and connecting it with L-shaped through-wall steel bars, the steel bars and the wall form an integral whole, thereby improving the seismic performance of the wall.

[0004] However, the existing technology involves adding a steel mesh to one side of the wall and forming an integral whole with the wall through through-wall reinforcement bars. The shortcomings of this technology are: (1) The thickness of the mortar joints between the blocks is usually relatively small, while the minimum diameter of ordinary steel bars is 6mm, making it difficult to ensure that through-wall reinforcement bars can be inserted between the mortar joints; (2) Even if through-wall reinforcement bars can be inserted at the mortar joints, the mortar at the joints provides very limited coverage for the through-wall reinforcement bars, resulting in very weak pull-out resistance. Under lateral force, they are easily pulled out of the mortar joints; (3) The cross-sectional area of ​​the through-wall reinforcement bars is small, and the transverse... The shear resistance is weak, and the small number of through-wall reinforcement bars cannot effectively ensure that the original wall and the steel mesh share the same or coordinated force. As a result, the reinforcement effect of the steel mesh on the original wall is very limited. Therefore, the lateral stiffness and shear bearing capacity of the reinforced wall are not significantly improved. (4) Under the action of horizontal seismic shear force, the wall generally develops diagonal or cross diagonal cracks. The steel mesh in this technology is set orthogonally in the longitudinal and transverse directions and arranged throughout the wall, which is not only inefficient but also wasteful. (5) The thickness of the reinforced wall increases significantly on one side, which significantly reduces the usable space on the outside of the wall. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a construction and design method for an interlocking jointed masonry wall reinforcement structure to solve the aforementioned problems.

[0006] This invention provides the following technical solution:

[0007] A construction and design method for an interlocking jointed masonry wall reinforcement structure includes the following steps:

[0008] A groove with an "X" shape is chiseled out along the mortar joint on one side of the stone masonry wall;

[0009] Press the polymer mortar into the groove;

[0010] Before the polymer mortar sets, multiple L-shaped steel plates and T-shaped steel plates are interlaced and embedded into grooves filled with polymer mortar. The multiple L-shaped steel plates and T-shaped steel plates are interlaced to form steel plates with an "X" shaped outline.

[0011] Polymer mortar is applied to one side of the masonry wall to form a polymer mortar surface layer, which covers all the L-shaped and T-shaped steel plates.

[0012] The masonry walls, polymer mortar surface layer, and steel plates shall meet the following design requirements:

[0013] V≤V m +V s +V p

[0014] V≤1.4V m

[0015] In the formula, V represents the design value of the shear force within the masonry wall surface;

[0016] V m —The shear bearing capacity of the unreinforced stone wall shall be calculated and determined in accordance with the current national standard "Code for Design of Masonry Structures" GB 5003;

[0017] V s —The contribution of the jointed steel plate to the shear bearing capacity of the stone wall;

[0018] V p —The contribution of polymer mortar surface layer to the shear bearing capacity of stone walls;

[0019]

[0020] In the formula, η is the influence coefficient of unilateral reinforcement;

[0021] α s —Coefficient of the jointed steel plate in operation;

[0022] f s —Design value of tensile strength of steel plate;

[0023] f v —Design value of shear strength of steel plate;

[0024] —The cross-sectional area of ​​the horizontal end of the i-th steel plate passing through the calculated inclined section;

[0025] —The cross-sectional area of ​​the i-th steel plate at the vertical end of the calculated inclined section;

[0026] n — the number of horizontal ends of the steel plate passing through the calculated inclined section;

[0027] m — the number of vertical ends of the steel plate passing through the calculated inclined section.

[0028] V p =0.02f c tl

[0029] In the formula, f c —Design value of axial compressive strength of polymer mortar;

[0030] t — thickness of polymer mortar surface layer;

[0031] l — Length of the wall in the horizontal direction.

[0032] Preferably, the steel plate includes an L-shaped steel plate and a T-shaped steel plate, which are adapted to the groove with an "X" shaped outline. One side of the L-shaped steel plate and the T-shaped steel plate extends to the outside of the groove, and a through groove is formed in the part of the L-shaped steel plate and the T-shaped steel plate extending to the outside of the groove.

[0033] Preferably, both the L-shaped steel plate and the T-shaped steel plate have through holes, and the through holes of the L-shaped steel plate and / or the T-shaped steel plate are aligned with those of adjacent staggered L-shaped steel plates and / or T-shaped steel plates.

[0034] Preferably, the L-shaped or T-shaped steel plate has multiple through holes; the diameter of the through holes is 10-20 mm, the center-to-center distance between adjacent through holes is greater than 3 times the diameter of the through hole, and the distance from the center of the through hole to the edge of the plate is greater than 1.5 times the diameter of the through hole.

[0035] Preferably, one side of the L-shaped steel plate and the T-shaped steel plate extends more than 10mm beyond the outside of the groove.

[0036] Preferably, the L-shaped steel plate and the T-shaped steel plate have through grooves extending to the outside of the groove.

[0037] Preferably, the thickness of the polymer mortar surface layer relative to the sidewall of the masonry wall is greater than 15 mm.

[0038] Preferably, the horizontal end length of the single-sided flange of the L-shaped steel plate and T-shaped steel plate along the horizontal direction of the mortar joint is less than half the length of a single stone block, and greater than 50mm;

[0039] Preferably, the vertical end length of the L-shaped steel plate and the T-shaped steel plate along the vertical direction of the mortar joint is less than the height of a single stone block, but greater than 50mm.

[0040] Preferably, the width of the L-shaped steel plate and / or T-shaped steel plate is 1 / 4 to 1 / 2 of the thickness of the masonry wall.

[0041] Preferably, multiple L-shaped steel plates are arranged according to the following method before the polymer mortar in the groove initially sets. or The items are stacked in pairs, with two T-shaped steel plates used at the "X" intersections. and Stacked in an alternating pattern.

[0042] The present invention has the following beneficial technical effects:

[0043] This invention utilizes L-shaped and T-shaped steel plates embedded in the mortar joints of masonry blocks to effectively improve the overall lateral resistance of masonry walls. The mortar tenons formed on the horizontal branches of the L-shaped and T-shaped steel plates along the mortar joints enhance the interlocking force between the steel plates and the polymer mortar within the grooves. The vertical branches of the steel plates along the mortar joints improve the synergistic stress distribution between the masonry blocks and the steel plates, mitigating the previously poor shear resistance between the masonry blocks and the mortar joints. The through-grooves on the outer side of the steel plates enhance the bonding effect between the steel plates and the outer mortar surface layer of the wall, thus organically integrating the masonry wall, steel plates, and mortar surface layer into a unified load-bearing structure. Based on this, the "X"-shaped staggered joint reinforcement arrangement further efficiently enhances the overall lateral resistance of the masonry wall.

[0044] This invention will not damage the stone masonry, is simple to construct, low in cost, and can flexibly adjust the caulking position according to the actual situation, thus adapting to different reinforcement scenarios and actual engineering needs. Attached Figure Description

[0045] Figure 1 This is a three-dimensional view of Embodiment 1 of the present invention;

[0046] Figure 2 This is a schematic plan view of Embodiment 1 of the present invention;

[0047] Figure 3 for Figure 2 Sectional view along direction AA in the middle;

[0048] Figure 4 for Figure 2 BB direction section view;

[0049] Figure 5 for Figure 3 Enlarged view of section A-1 in the image;

[0050] Figure 6 for Figure 4 Enlarged view of section B-1 in the image;

[0051] Figure 7 This is a schematic diagram of the staggered fit of adjacent L-shaped steel plates according to the present invention;

[0052] Figure 8This is a schematic diagram of the staggered fit of adjacent T-shaped steel plates according to the present invention;

[0053] Figure 9 This is a schematic diagram of the L-shaped steel plate of the present invention;

[0054] Figure 10 This is a schematic diagram of the T-shaped steel plate of the present invention;

[0055] Figure 11 This is a schematic plan view of the entire embodiment of the present invention (Example 2).

[0056] Figure 12 This is a schematic plan view of the entire embodiment of the present invention.

[0057] Figure 13 This invention provides a mechanical model for a stone masonry wall.

[0058] The attached figures are labeled as follows:

[0059] 1. Polymer mortar surface layer; 2. L-shaped steel plate; 3. Mortar joint; 4. Stone block; 5. Through hole; 6. T-shaped steel plate; 7. Through groove. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Example 1: As Figures 1-10 As shown:

[0062] It includes polymer mortar surface layer 1, L-shaped steel plate 2, mortar joint 3, stone block 4, through hole 5, T-shaped steel plate 6, and through groove 7.

[0063] First, during the reinforcement process, an "X"-shaped groove is chiseled along the mortar joint 3 on the interior side of the masonry wall. Then, polymer mortar is used to fill the groove to ensure the integrity of the masonry wall. Next, before the polymer mortar initially sets, multiple L-shaped steel plates 2 and T-shaped steel plates 6 are staggered and embedded into the center of the filled groove, forming an staggered "X"-shaped reinforcement structure.

[0064] The concrete tenons formed on the horizontal ends of the L-shaped steel plates 2 and T-shaped steel plates 6 along the horizontal direction of the mortar joint 3 help to enhance the interlocking force between the L-shaped steel plates 2 and T-shaped steel plates 6 and the mortar / polymer mortar. The vertical ends of the L-shaped steel plates 2 and T-shaped steel plates 6 along the vertical direction of the mortar joint can improve the synergistic force distribution between the stone blocks 4 and the L-shaped steel plates 2 / T-shaped steel plates 6, which is beneficial to improving the poor shear resistance combination effect that has always existed between the stone blocks 4 and the mortar / polymer mortar. Finally, a layer of polymer mortar surface layer 1 is covered on the reinforced side wall of the stone masonry wall to cover all steel plates and protect their surfaces, ensuring the integrity and stability of the overall reinforced structure. The through grooves 7 opened on the outer side of the L-shaped steel plates 2 and T-shaped steel plates 6 help to enhance the combination effect and integrity of the L-shaped steel plates 2 and T-shaped steel plates 6 with the polymer mortar surface layer 1 on the outer side of the wall.

[0065] After the polymer mortar in the groove solidifies, it forms part of the polymer mortar surface layer 1.

[0066] like Figure 1 As shown, the specific implementation method of the non-destructive reinforcement technology for one side of a masonry wall is as follows:

[0067] (1) Determine the position of the “X” type caulking joint in the mortar joint 3 on the interior side of the stone masonry wall, and chisel out the “X” type groove to remove the dust in the cavity;

[0068] (2) Press the polymer mortar into the groove. When filling the groove gap, use tools such as trowels and grout knives to make the polymer mortar fill the groove gap evenly.

[0069] (3) Before the polymer mortar in the groove initially sets, place multiple L-shaped steel plates 2 according to... or The items are arranged in a staggered, interlocking pattern, with two T-shaped steel plates used at the "X" intersections. and The staggered stacking ultimately forms an "X"-shaped staggered joint reinforcement arrangement on the reinforced side wall of the masonry wall. It should be noted that after the L-shaped steel plate 2 and T-shaped steel plate 6 are embedded in the polymer mortar groove at the mortar joint 3, a 10mm width should be reserved on the outside of the masonry wall (i.e., 10mm beyond the outer surface of the masonry wall) to ensure that the through groove 7 on the L-shaped steel plate 2 and T-shaped steel plate 6 is exposed on the outside of the masonry wall.

[0070] The staggered fit of adjacent L-shaped steel plates 2 is as follows Figure 7 As shown, the multiple through holes 5 at the intersection are aligned; the staggered fit of adjacent T-shaped steel plates 6 is as follows: Figure 8 As shown, the multiple through holes 5 at the intersection are aligned.

[0071] (4) Use polymer mortar to reinforce the interior side of the entire masonry wall to cover all L-shaped steel plates 2 and T-shaped steel plates 6; the thickness of polymer mortar surface layer 1 should be applied as needed, but should not be less than 15mm; as needed, polymer mortar surface layer 1 can cover only the steel plate area, or it can be applied along the entire masonry wall.

[0072] Examples 2 and 3 are respectively as follows Figure 11 and Figure 12 As shown, by changing the caulking position in step (1) above, multiple "X"-shaped reinforcement bases are formed. Then, by repeating steps (2), (3), and (4), the stone masonry walls at the door and window openings can be reinforced and renovated.

[0073] Design Methodology:

[0074] A staggered, mortise-and-tenon, single-sided, non-destructive reinforced masonry wall, where the reinforced surface layer and the stone wall work together, with horizontal loads shared by both the stone wall and the reinforced surface layer. Its mechanical model is as follows: Figure 13 As shown, the design should meet the requirements of formula (1). Wherein, V m V represents the shear bearing capacity of an unreinforced stone wall. s V represents the contribution of the jointed steel plate to the shear capacity of the stone wall. p This indicates the contribution of the polymer mortar surface layer to the shear capacity of the stone wall. Since the mortar layer replaced by the joint is relatively small, the increase in shear capacity due to the replacement mortar layer is ignored.

[0075] V≤V m +V s +V p (1)

[0076] V≤1.4V m (2)

[0077] In the formula, V represents the design value of the shear force within the masonry wall surface;

[0078] V m —The shear bearing capacity of the unreinforced stone wall shall be calculated and determined in accordance with the current national standard "Code for Design of Masonry Structures" GB 5003;

[0079] V s —The contribution of the jointed steel plate to the shear bearing capacity of the stone wall is calculated using formula (3);

[0080] V p —The contribution of polymer mortar surface layer to the shear bearing capacity of stone wall is calculated using formula (4).

[0081]

[0082] In the formula, η is the influence coefficient of unilateral reinforcement;

[0083] α s —Coefficient of the jointed steel plate in operation;

[0084] f s —Design value of tensile strength of steel plate;

[0085] f v —Design value of shear strength of steel plate;

[0086] —The cross-sectional area of ​​the horizontal end of the i-th steel plate passing through the calculated inclined section;

[0087] —The cross-sectional area of ​​the i-th steel plate at the vertical end of the calculated inclined section;

[0088] n — the number of horizontal ends of the steel plate passing through the calculated inclined section;

[0089] m — the number of vertical ends of the steel plate passing through the calculated inclined section.

[0090] V p =0.02f c tl (4)

[0091] In the formula, f c —Design value of axial compressive strength of polymer mortar;

[0092] t — thickness of polymer mortar surface layer;

[0093] l — Length of the wall in the horizontal direction.

[0094] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A construction method for a staggered jointed masonry wall reinforcement structure, characterized in that, Includes the following steps: On one side of the masonry wall, along the mortar joint (3), chisel out an "X" shaped groove; Press the polymer mortar into the groove; Before the polymer mortar sets, multiple L-shaped steel plates (2) and T-shaped steel plates (6) are interleaved and embedded into the grooves filled with polymer mortar. The multiple L-shaped steel plates (2) and T-shaped steel plates (6) are interleaved to form a steel plate with an "X" shape. Polymer mortar is applied to one side of the masonry wall to form a polymer mortar surface layer (1), which covers all the L-shaped steel plates (2) and T-shaped steel plates (6). The masonry wall, polymer mortar surface layer (1), and steel plate shall meet the following design requirements: In the formula, —Design value of internal shear force in masonry wall; —The shear bearing capacity of the unreinforced stone wall shall be calculated and determined in accordance with the current national standard "Code for Design of Masonry Structures" GB 50003; —The contribution of the jointed steel plate to the shear bearing capacity of the stone wall; —The contribution of polymer mortar surface layer to the shear bearing capacity of stone walls; In the formula, —Influence coefficient of unilateral reinforcement; —Coefficient of the jointed steel plate in operation; —Design value of tensile strength of steel plate; —Design value of shear strength of steel plate; —The cross-sectional area of ​​the horizontal end of the i-th steel plate passing through the calculated inclined section; —The cross-sectional area of ​​the i-th steel plate at the vertical end of the calculated inclined section; —The number of horizontal ends of the steel plate passing through the calculated oblique section; —Number of vertical ends of the steel plate passing through the calculated inclined section; In the formula, —Design value of axial compressive strength of polymer mortar; —Thickness of polymer mortar surface layer; — Horizontal length of the wall; The L-shaped steel plate (2) and the T-shaped steel plate (6) extend to the outside of the groove on one side, and a through groove (7) is provided at the part of the L-shaped steel plate (2) and the T-shaped steel plate (6) that extends to the outside of the groove. Both the L-shaped steel plate (2) and the T-shaped steel plate (6) are provided with through holes (5), and the through holes (5) of the L-shaped steel plate (2) and / or the T-shaped steel plate (6) are aligned with the through holes (5) between the adjacent staggered L-shaped steel plates (2) and / or the T-shaped steel plates (6).

2. The construction method of the staggered jointed masonry wall reinforcement structure according to claim 1, characterized in that, The L-shaped steel plate (2) or T-shaped steel plate (6) has multiple through holes (5); the diameter of the through holes (5) is 10~20mm, the center distance between adjacent through holes (5) is greater than 3 times the diameter of the through hole (5), and the distance from the center of the through hole (5) to the edge of the plate is greater than 1.5 times the diameter of the through hole (5).

3. The construction method of the staggered jointed masonry wall reinforcement structure according to claim 1, characterized in that, The L-shaped steel plate (2) and the T-shaped steel plate (6) extend more than 10 mm to the outside of the groove on one side.

4. The construction method of the staggered jointed masonry wall reinforcement structure according to claim 1, characterized in that, The polymer mortar surface layer (1) has a thickness greater than 15 mm relative to the side wall of the masonry wall.

5. The construction method of the staggered jointed masonry wall reinforcement structure according to claim 1, characterized in that, The horizontal end length of the single-sided flange of the L-shaped steel plate (2) and the T-shaped steel plate (6) along the horizontal direction of the mortar joint (3) is less than half the length of a single stone block (4) and greater than 50mm; The vertical end length of the L-shaped steel plate (2) and T-shaped steel plate (6) along the vertical direction of the mortar joint (3) is less than the height of a single stone block (4) and greater than 50mm.

6. The construction method of the staggered jointed masonry wall reinforcement structure according to claim 1, characterized in that, Before the polymer mortar in the groove sets, multiple L-shaped steel plates (2) are stacked in pairs in the manner of "└", "┐", "┘" or "┌". At the "X" intersection, two T-shaped steel plates (6) are stacked in the manner of "┬" and "┴".

Images