A kind of external wall prestressed steel strand reinforcement structure and construction method thereof

Abstract

The invention relates to the technical field of exterior wall steel strand structure construction, and specifically discloses an exterior wall prestressed steel strand reinforcement structure and a construction method thereof, comprising an exterior wall structure, a steel structure on the indoor side of the exterior wall structure, and a reinforcement structure on the outdoor side, wherein the exterior wall structure comprises a gable, two exterior longitudinal walls and two transverse walls, the steel structure comprises a first steel column, a second steel column and a third steel column, the reinforcement structure comprises a first connecting member arranged at a concave angle between the transverse wall and the exterior longitudinal wall outdoor, a plurality of second connecting members arranged at the exterior longitudinal wall outdoor, a third connecting member arranged at a convex angle between the gable and the exterior longitudinal wall outdoor, and two steel strands sequentially connected between the first connecting member, the second connecting member and the third connecting member, wherein the first connecting member, the second connecting member and the third connecting member are respectively connected and fixed to the first steel column, the second steel column and the third steel column, thereby forming the entire exterior wall prestressed steel strand reinforcement structure, and realizing the reinforcement of the exterior wall structure.

Description

Technical Field

[0001] The present invention relates to the technical field of exterior wall steel strand structure construction, and particularly to a prestressed steel strand reinforcement structure for exterior walls and a construction method thereof. Background Art

[0002] With the continuous development of the construction industry, structural reinforcement technology has been widely applied. However, due to the lack of ring beams and construction columns in some relatively old masonry buildings, there are problems such as insufficient crack resistance, limited bearing capacity, and insufficient durability in the reinforcement process. The traditional reinforcement construction method is relatively difficult. The present invention provides an external cable reinforcement technology, which, as an innovative reinforcement method, has the characteristics of simple operation, good reinforcement effect, wide application range, clear force system, simple construction operation, and short construction period. The application of prestressed steel strands in the exterior wall structure is mainly based on their high strength, high durability, and good mechanical properties. During the prefabrication of the exterior wall, the prestressed steel strands are pre-tensioned to generate a certain prestress, and then fixed in the exterior wall structure. In this way, when the exterior wall is subjected to external forces, the prestressed steel strands can provide additional tensile support to improve the bearing capacity of the exterior wall. Summary of the Invention

[0003] The purpose of the present invention is to provide a prestressed steel strand reinforcement structure for exterior walls and a construction method thereof, aiming to solve the technical problems mentioned in the above background art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A prestressed steel strand reinforcement structure for exterior walls includes an exterior wall structure, a steel structure provided on the indoor side of the exterior wall structure, and a reinforcement structure provided on the outdoor side of the exterior wall structure. The exterior wall structure includes gable walls, two outer longitudinal walls, and two transverse walls. A U-shaped structure is formed between the two outer longitudinal walls and the gable wall, and a T-shaped structure is formed between each of the two transverse walls and the two outer longitudinal walls respectively. The steel structure includes a first steel column provided at the indoor-side internal corner between the transverse wall and the outer longitudinal wall, a plurality of second steel columns evenly spaced on the indoor side of the outer longitudinal wall, and a third steel column provided at the indoor-side internal corner between the gable wall and the outer longitudinal wall. The reinforcement structure includes a first connecting member provided at the outdoor-side internal corner between the transverse wall and the outer longitudinal wall, a plurality of second connecting members provided on the outdoor side of the outer longitudinal wall, a third connecting member provided at the outdoor-side external corner between the gable wall and the outer longitudinal wall, and two steel strands sequentially connected between the first connecting member, the second connecting members, and the third connecting member. The first connecting member, the second connecting members, and the third connecting member are respectively connected and fixed to the first steel column, the second steel columns, and the third steel column.

[0006] Further, the first connecting member includes a cantilever steel plate, which is in a C-shaped groove structure. One end of the cantilever steel plate vertically penetrates the outer longitudinal wall and is fixedly connected to the first steel column, and the other end of the cantilever steel plate extends outside the outdoor side of the outer longitudinal wall.

[0007] Furthermore, the second connecting member includes a first galvanized steel tie rod and a first fixed cover plate. The first fixed cover plate is arranged in contact with the outer side of the outer longitudinal wall. The first galvanized steel tie rod vertically penetrates the first fixed cover plate, the outer longitudinal wall and the second steel column, and is respectively connected to the second steel column and the first fixed cover plate at both ends by bolts.

[0008] Furthermore, the third connecting member includes two second galvanized steel tie rods, two second fixed cover plates and a positive corner pad. The two second fixed cover plates are respectively arranged on the outer side of the outer longitudinal wall and the outer side of the gable. One end of the two second galvanized steel tie rods vertically penetrate the outer longitudinal wall and the gable and are fixedly connected to the third steel column by bolts, and the other end is respectively fixedly connected to the two second fixed cover plates by bolts. The positive corner pad is an L-shaped structure, the inner angle of the positive corner pad is a right angle, the outer side of the positive corner pad is an arc-shaped surface, and the inner angle of the positive corner pad is arranged to fit the positive corner of the gable and the outer side of the outer longitudinal wall.

[0009] Furthermore, the cantilevered steel plate, the first fixed cover plate, the second fixed cover and the external corner pad are arranged at the same height, and the end of the cantilevered steel plate extending out from the outer side of the external longitudinal wall is provided with two connecting holes, and the ends of the two steel strands are respectively connected and fixed to the two connecting holes of the cantilevered steel plate, and the inner sides of the first fixed cover plate and the second fixed cover plate are provided with two limiting grooves matching the specifications of the steel strands, and the belly of the steel strand is limited in the limiting grooves, and the external corner pad is provided with two accommodating grooves along the arc surface on the outer side, and the steel strand is limited in the accommodating grooves at the external corner between the gable and the external longitudinal wall.

[0010] Furthermore, the first steel column, the second steel column and the third steel column are all rectangular columns with the same structure.

[0011] Furthermore, the interiors of the first steel column, the second steel column and the third steel column are filled with cement-based grouting materials, and the outer circumferences of the first steel column, the second steel column and the third steel column are provided with fire-retardant coatings.

[0012] A construction method for an exterior wall prestressed steel strand reinforcement structure comprises the following steps:

[0013] Step 1: prepare construction materials, install indoor steel components first, install the first steel column, the second steel column and the third steel column on the first floor, and after the installation is completed, install the first-floor steel beam to form an overall force-bearing system. After the lifting position of the indoor steel beam reaches the predetermined installation elevation, pre-tighten the two ends with high-strength bolts and column connecting plates, and then weld the beams and columns;

[0014] Step 2, the interior of the first steel column, the second steel column and the third steel column are filled with cement-based grouting material, and the surface is sprayed with fire retardant coating;

[0015] Step 3, install the first connecting member and the external corner pad, connect the end of the steel strand to the first connecting member, limit the steel strand in the accommodating groove of the external corner pad, tension the steel strand, connect the first galvanized steel tie rod and the second galvanized steel tie rod to the second steel column and the third steel column respectively, and install the first fixed cover plate and the second fixed cover plate. After the installation is completed, remeasure the cable tension to ensure that the actual cable tension reaches the design value.

[0016] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0017] The present invention connects and fixes the reinforcement structure with the steel structure through a steel structure arranged on the indoor side of the exterior wall structure and a reinforcement structure arranged on the outdoor side of the exterior wall structure, so that the steel strands are hooped around the outer periphery of the exterior wall structure, and the indoor steel structure is combined with the steel strands to form an integral exterior wall prestressed steel strand reinforcement structure, so as to realize the reinforcement of the exterior wall structure. Under aging or external force, the prestressed steel strands can play a role, and together with the original structure, realize the overall structural stability performance, increase the overall earthquake resistance of the building, solve the problem of insufficient compressive bearing capacity of masonry structures under the limit state of lacking ring beams and structural columns, avoid changing the style of the building's exterior facade, reduce the interference of the reinforcement process on the building body, and the construction measures are reversible, and the demolition will not cause damage to the building body, and the overall style of the building is less affected. As an innovative reinforcement method, it has the characteristics of simple operation, good reinforcement effect, wide application range, clear force system, simple construction operation, and short construction period, has good promotion and practical value, and will produce good economic benefits after wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the vertical section structure of the first connecting member of the present invention;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the first connecting member of the present invention;

[0021] Figure 4 It is a schematic diagram of the vertical section structure of the second connecting member of the present invention;

[0022] Figure 5 is a schematic cross-sectional structure diagram of a second connecting member of the present invention;

[0023] Figure 6 It is a schematic cross-sectional structure diagram of the third connecting member of the present invention.

[0024] Figure numerals: 1. gable; 2. outer longitudinal wall; 3. transverse wall; 4. first steel column; 5. second steel column; 6. third steel column; 7. steel strand; 8. cantilevered steel plate; 9. first galvanized steel tie rod; 10. first fixed cover plate; 11. second galvanized steel tie rod; 12. second fixed cover plate; 13. external corner pad. DETAILED DESCRIPTION

[0025] In order to make the technical means, innovative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0026] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0027] The present invention discloses an exterior wall prestressed steel strand reinforcement structure, which is suitable for the repair and reinforcement projects of modern and old buildings with masonry structures as the main body and steel, wooden and concrete roof trusses as the roof, and high requirements for the appearance of the buildings, such as Figures 1 to 6As shown in the figure, it includes an exterior wall structure, a steel structure arranged on the indoor side of the exterior wall structure, and a reinforcement structure arranged on the outdoor side of the exterior wall structure. The exterior wall structure includes gable walls 1, two outer longitudinal walls 2, and two transverse walls 3. A U-shaped structure is formed between the two outer longitudinal walls 2 and the gable wall 1. T-shaped structures are formed between the two transverse walls 3 and the two outer longitudinal walls 2 respectively. The corners on the outdoor side of the outer longitudinal wall 2 and the gable wall 1 are external corners, and the corners on the outdoor side of the transverse wall 3 and the outer longitudinal wall 2 are internal corners. The steel structure includes a first steel column 4 arranged at the internal corner on the indoor side of the transverse wall 3 and the outer longitudinal wall 2, multiple second steel columns 5 evenly spaced on the indoor side of the outer longitudinal wall 2, and a third steel column 6 arranged at the internal corner on the indoor side of the gable wall 1 and the outer longitudinal wall 2. The first steel column 4, the second steel column 5, and the third steel column 6 are all rectangular columns with the same structure. The interiors of the first steel column 4, the second steel column 5, and the third steel column 6 are all filled with cement-based grouting material. Fireproof coatings are provided on the outer peripheries of the first steel column 4, the second steel column 5, and the third steel column 6. The reinforcement structure includes a first connecting member arranged at the internal corner on the outdoor side of the transverse wall 3 and the outer longitudinal wall 2, multiple second connecting members arranged on the outdoor side of the outer longitudinal wall 2, a third connecting member arranged at the external corner on the outdoor side of the gable wall 1 and the outer longitudinal wall 2, and two steel strands 7 sequentially connected between the first connecting member, the second connecting member, and the third connecting member. The first connecting member is fixedly connected to the first steel column 4, the second connecting member is fixedly connected to the second steel column 5, and the third connecting member is fixedly connected to the third steel column 6. The first connecting member includes a protruding steel plate 8. The protruding steel plate 8 is in a C-shaped groove structure. The protruding steel plate 8 is provided with an upper plate and a lower plate. One end of the protruding steel plate 8 vertically penetrates the outer longitudinal wall 2 and is fixedly connected to the first steel column 4, and the other end of the protruding steel plate 8 extends to the outdoor side of the outer longitudinal wall 2. The second connecting member includes a first galvanized steel tie rod 9 and a first fixing cover plate 10. Through holes are provided on the first fixing cover plate 10. The first fixing cover plate 10 is arranged in contact with the outdoor side of the outer longitudinal wall 2. Threads are provided at both ends of the first galvanized steel tie rod 9. The first galvanized steel tie rod 9 vertically penetrates the first fixing cover plate 10, the outer longitudinal wall 2, and both ends of the second steel column 5 and is respectively connected to the second steel column 5 and the first fixing cover plate 10 by bolts, so as to fix the first fixing cover plate 10 and the second steel column 5 in a tensioned manner. The third connecting member includes two second galvanized steel tie rods 11, two second fixing cover plates 12, and an external corner cushion block 13. The second fixing cover plate 12 and the first fixing cover plate 10 have the same structure. The two second fixing cover plates 12 are respectively arranged on the outdoor side of the outer longitudinal wall 2 and the outdoor side of the gable wall 1. One ends of the two second galvanized steel tie rods 11 respectively vertically penetrate the outer longitudinal wall 2 and the gable wall 1 and are fixedly connected to the third steel column 6 by bolts. The other ends of the two second galvanized steel tie rods 11 are respectively fixedly connected to the two second fixing cover plates 12 by bolts, so as to fix the two second fixing cover plates 12 and the third steel column 6 in a tensioned manner. The external corner cushion block 13 is in a similar L-shaped structure. The inner corner of the external corner cushion block 13 is a right angle, and the outer side of the external corner cushion block 13 is an arc surface. The inner corner of the external corner cushion block 13 is arranged in contact with the external corner on the outdoor side of the gable wall 1 and the outer longitudinal wall 2. Connecting holes are provided on both sides of the external corner cushion block 13. The external corner cushion block 13 is respectively connected and fixed to the outer longitudinal wall 2 and the gable wall 1 by post-inserted bars;The cantilevered steel plate 8, the first fixed cover plate 10, the second fixed cover and the external corner pad 13 are arranged at the same height; the end of the cantilevered steel plate 8 extending outward from the outer side of the external longitudinal wall 2 is provided with two connecting holes, and the two connecting holes are respectively arranged on the upper plate and the lower plate of the cantilevered steel plate 8, and the ends of the two steel strands 7 are respectively connected and fixed to the two connecting holes of the cantilevered steel plate 8, and the inner sides of the first fixed cover plate 10 and the second fixed cover plate 12 are provided with two limiting grooves matching the specifications of the steel strands 7, and the two limiting grooves are arranged horizontally up and down, and the abdomen of the steel strands 7 is limited in the limiting grooves, and the external corner pad 13 is provided with two accommodating grooves along the arc surface on the outer side, and the steel strands 7 are limited in the accommodating grooves at the external corner of the gable 1 and the external longitudinal wall 2, wherein the steel strands 7 are high vanadium cables, and the ends of the high vanadium cables are ST3 type double-ear adjustable anchors, so that the steel strands 7 are hooped around the outer periphery of the external wall structure to form a reinforcement structure of the entire external wall prestressed steel strands 7, thereby realizing reinforcement of the external wall structure. ;

[0028] A construction method for an exterior wall prestressed steel strand reinforcement structure comprises the following steps:

[0029] Step 1, prepare construction materials, first install indoor steel components, install the first steel column 4, the second steel column 5 and the third steel column 6 on the first floor, after the installation is completed, install the first floor steel beam to form an overall force system, after the lifting position of the indoor steel beam reaches the predetermined installation elevation, use high-strength bolts at both ends to pre-tighten the column connection plate, and then weld the beam and column;

[0030] Step 2, filling the first steel column 4, the second steel column 5 and the third steel column 6 with cement-based grouting material, and spraying fire retardant coating on the surface of the steel components;

[0031] Step 3, install the first connecting member at the outdoor inner corner between the transverse wall 3 and the outer longitudinal wall 2 and the outer corner pad 13 at the outdoor outer corner between the gable 1 and the outer longitudinal wall 2, connect the end of the steel strand 7 to the first connecting member, limit the steel strand 7 in the accommodating groove of the outer corner pad 13 at the outdoor outer corner between the gable 1 and the outer longitudinal wall 2, tension the steel strand 7, connect the first galvanized steel tie rod 9 and the second galvanized steel tie rod 11 to the second steel column 5 and the third steel column 6 respectively, install the first fixed cover plate 10 and the second fixed cover plate 12, limit the belly of the steel strand 7 in the limiting groove, and remeasure the cable tension after installation to ensure that the actual cable tension reaches the design value.

[0032] The present invention connects and fixes the reinforcement structure with the steel structure through a steel structure arranged on the indoor side of the exterior wall structure and a reinforcement structure arranged on the outdoor side of the exterior wall structure, so that the steel strands are hooped around the outer periphery of the exterior wall structure, and the indoor steel structure is combined with the steel strands to form an overall exterior wall prestressed steel strand reinforcement structure, so as to realize the reinforcement of the exterior wall structure. Under aging or external force, the prestressed steel strands can play a role and realize the overall structural stability together with the original structure, thereby increasing the overall earthquake resistance of the building, solving the problem of insufficient compressive bearing capacity of masonry structures under the limit state of lacking ring beams and structural columns, avoiding changing the appearance of the building's exterior facade, reducing the interference of the reinforcement process on the building body, and the construction measures are reversible, and the demolition will not cause damage to the building body, and has little impact on the overall style of the building. As an innovative reinforcement method, it has the technical effects of simple operation, good reinforcement effect, wide application range, clear force system and simple construction operation.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An external wall prestressed steel strand reinforcement structure, characterized in that: It includes an exterior wall structure, a steel structure arranged on the indoor side of the exterior wall structure, and a reinforcement structure arranged on the outdoor side of the exterior wall structure. The exterior wall structure includes gable walls (1), two outer longitudinal walls (2) and two transverse walls (3). A U-shaped structure is formed between the two outer longitudinal walls (2) and the gable wall (1), and a T-shaped structure is formed between each of the two transverse walls (3) and the two outer longitudinal walls (2) respectively. The steel structure includes a first steel column (4) arranged at the indoor-side internal corner of the transverse wall (3) and the outer longitudinal wall (2), a plurality of second steel columns (5) evenly spaced on the indoor side of the outer longitudinal wall (2), and a third steel column (6) arranged at the indoor-side internal corner of the gable wall (1) and the outer longitudinal wall (2). The reinforcement structure includes a first connecting member arranged at the outdoor-side internal corner of the transverse wall (3) and the outer longitudinal wall (2), a plurality of second connecting members arranged on the outdoor side of the outer longitudinal wall (2), a third connecting member arranged at the outdoor-side external corner of the gable wall (1) and the outer longitudinal wall (2), and two steel strands (7) sequentially connected between the first connecting member, the second connecting member and the third connecting member. The first connecting member, the second connecting member and the third connecting member are respectively connected and fixed to the first steel column (4), the second steel column (5) and the third steel column (6).

2. The exterior wall prestressed steel strand reinforcement structure according to claim 1, characterized in that: The first connecting member includes a cantilever steel plate (8). The cantilever steel plate (8) is of a C-shaped groove structure. One end of the cantilever steel plate (8) vertically penetrates the outer longitudinal wall (2) and is fixedly connected to the first steel column (4), and the other end of the cantilever steel plate (8) extends out of the outdoor side of the outer longitudinal wall (2).

3. The external wall prestressed steel strand reinforcement structure according to claim 2, characterized in that: The second connecting member includes a first galvanized steel tie rod (9) and a first fixing cover plate (10). The first fixing cover plate (10) is arranged in contact with the outdoor side of the outer longitudinal wall (2). The first galvanized steel tie rod (9) vertically penetrates the first fixing cover plate (10), the outer longitudinal wall (2) and the second steel column (5), and both ends are respectively bolt-connected to the second steel column (5) and the first fixing cover plate (10).

4. The exterior wall prestressed steel strand reinforcement structure according to claim 3, characterized in that: The third connecting member includes two second galvanized steel tie rods (11), two second fixing cover plates (12) and an external corner cushion block (13). The two second fixing cover plates (12) are respectively arranged on the outdoor side of the outer longitudinal wall (2) and the outdoor side of the gable wall (1). One end of each of the two second galvanized steel tie rods (11) vertically penetrates the outer longitudinal wall (2) and the gable wall (1) and is bolt-fixed to the third steel column (6), and the other end is respectively bolt-fixed to the two second fixing cover plates (12). The external corner cushion block (13) is of a similar L-shaped structure. The inner corner of the external corner cushion block (13) is a right angle, and the outer side of the external corner cushion block (13) is an arc surface. The inner corner of the external corner cushion block (13) is arranged in contact with the outdoor-side external corner of the gable wall (1) and the outer longitudinal wall (2). Connecting holes are provided on both sides of the external corner cushion block (13), and the external corner cushion block (13) is respectively connected and fixed to the outer longitudinal wall (2) and the gable wall (1) by post-inserted bars.

5. The exterior wall prestressed steel strand reinforcement structure according to claim 4, characterized in that: The cantilever steel plate (8), the first fixing cover plate (10), the second fixing cover and the external corner cushion block (13) are set at the same height.

6. The exterior wall prestressed steel strand reinforcement structure according to claim 5, characterized in that: The end of the protruding steel plate (8) extending out of the outdoor side of the outer longitudinal wall (2) is provided with two connection holes, and the ends of the two steel strands (7) are respectively connected and fixed to the two connection holes of the protruding steel plate (8). The inner sides of the first fixed cover plate (10) and the second fixed cover plate (12) are provided with two limiting grooves matching the specifications of the steel strands (7), and the belly of the steel strands (7) are limited in the limiting grooves. The outer side of the outer corner pad (13) is provided with two accommodating grooves along the arc surface, and the steel strands (7) are limited in the accommodating grooves at the outer corner of the gable (1) and the outer longitudinal wall (2) on the outdoor side.

7. The exterior wall prestressed steel strand reinforcement structure according to claim 1, characterized in that: The first steel column (4), the second steel column (5) and the third steel column (6) are all rectangular columns with the same structure. The first steel column (4), the second steel column (5) and the third steel column (6) are all filled with cement-based grouting materials, and the first steel column (4), the second steel column (5) and the third steel column (6) are all provided with fire-retardant coatings on their peripheries.

8. The construction method of the external wall prestressed steel strand reinforcement structure according to claim 6, characterized in that: The following steps are involved: Step 1, prepare construction materials, first install indoor steel components, install the first steel column (4), the second steel column (5) and the third steel column (6) on the first floor, and after the installation is completed, install the first floor steel beam to form an overall force system. After the lifting position of the indoor steel beam reaches the predetermined installation elevation, high-strength bolts are used at both ends to pre-tighten the column connection plate, and then the beam and column are welded; Step 2, the interior of the first steel column (4), the second steel column (5) and the third steel column (6) are filled with cement-based grouting material, and the surface is sprayed with fire retardant coating; Step 3, install the first connecting member and the external corner pad (13), connect the end of the steel strand (7) to the first connecting member, limit the steel strand (7) in the accommodating groove of the external corner pad (13), tension the steel strand (7), connect the first galvanized steel tie rod (9) and the second galvanized steel tie rod (11) to the second steel column (5) and the third steel column (6) respectively, and install the first fixed cover plate (10) and the second fixed cover plate (12). After the installation is completed, re-measure the cable tension to ensure that the actual cable tension reaches the design value.

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