New and old wall reinforcing and anti-cracking structure and construction method thereof

Abstract

The invention discloses a new and old wall reinforcing and anti-cracking structure and a construction method thereof. The new and old wall reinforcing and anti-cracking structure comprises an original masonry wall; the new wall body is built on one side of the original masonry wall, and a pouring space is formed between the vertical groove of the original masonry wall and the new wall body; the two ends of each tie bar are bent to form two limb rods, the tie bars are arranged on the two opposite sides of the pouring space respectively, a penetrating hole is formed in the original masonry wall, a base plate is attached to the other side of the original masonry wall, and the two limb rods of the tie bars on one side of the pouring space penetrate through the penetrating hole and are connected to the base plate. Two limb rods of the tie bars on the other side of the pouring space extend into the new wall body; the constructional column comprises a steel bar structure and concrete, the steel bar structure is arranged in the pouring space, and the concrete is poured into the pouring space and wraps the steel bar structure and the tie bars. The problem that at the junction of the new wall and the old wall, the old wall and the decorative surface layer are greatly damaged by removing the old masonry wall to pour the constructional column to connect the new wall is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a new and old wall reinforcement and crack prevention structure and a construction method thereof. Background Art

[0002] A new wall is constructed on one side of the existing wall to separate the space. Anchoring can be used at the junction of the new wall and the old wall, but the existing wall is a masonry wall, and due to its material, it is difficult to use anchoring to form an effective tie.

[0003] In this case, the existing method is usually to demolish the masonry at the junction of the new and old walls and re-construct structural columns to connect the new and old walls. However, since the newly added structural columns are difficult to form a tie and anchoring effect with the old walls and when the old walls and decorative surface layers are demolished, the demolition is generally expanded to facilitate the construction of the structural columns and the subsequent re-construction of the decorative surface layers. Summary of the Invention

[0004] In order to overcome the defects of the existing technology, a new and old wall reinforcement and crack prevention structure and its construction method are now provided to solve the problem that at the junction of the new and old walls, the old masonry wall is demolished to connect the new wall with the casting of structural columns, which causes great damage to the old wall and decorative surface layer.

[0005] To achieve the above-mentioned purpose, a new and old wall reinforcement and crack prevention structure is provided, comprising:

[0006] original masonry walls;

[0007] A new wall is built on one side of the original masonry wall and is arranged at an angle to the original masonry wall. A vertical groove is opened on the side of the original masonry wall facing the new wall, and a casting space is formed between the vertical groove and the new wall;

[0008] A tie bar, wherein both ends of the tie bar are bent to form two limbs, and the tie bars are respectively provided on opposite sides of the casting space. The original masonry wall is provided with a through hole, and a backing plate is attached to the other side of the original masonry wall. The two limbs of the tie bar on one side of the casting space pass through the through hole and are connected to the backing plate, and the two limbs of the tie bar on the other side of the casting space extend into the new wall.

[0009] The structural column includes a steel bar structure and concrete. The steel bar structure is arranged in the casting space. The opposite sides of the steel bar structure are connected to the tie bars on the opposite sides of the casting space. The concrete is poured in the casting space and covers the steel bar structure and the tie bars.

[0010] Furthermore, the steel structure includes multiple vertical main bars and multiple stirrups, the multiple vertical main bars are vertically arranged in the casting space and arranged along the circumferential direction of the casting space, the stirrups are fixed to the outside of the multiple vertical main bars, and a sleeve is formed between the tie bar and the two limbs, and the sleeve is sleeved on the multiple vertical main bars on one side of the casting space.

[0011] Furthermore, a limit piece is installed on the limb in an adjustable position, and the limit piece is attached to one side of the original masonry wall.

[0012] Furthermore, the limb is formed with an external thread, the pad and the limiting member are respectively provided with threaded holes, and the limb is screwed into the threaded holes.

[0013] Furthermore, cement mortar is poured into the through hole, and the cement mortar is coated on the limb.

[0014] Furthermore, the tie bars on opposite sides of the casting space are arranged alternately.

[0015] The present invention provides a construction method for reinforcing new and old walls and preventing cracking, comprising the following steps:

[0016] A vertical groove and a through-hole are formed on one side of the original masonry wall, wherein the through-hole is connected to the bottom of the vertical groove;

[0017] Insert the two limbs of the tie bar into the through hole and connect them to the pad;

[0018] tying a steel bar structure on one side of the original masonry wall so that one side of the steel bar structure is connected to the tie bar;

[0019] Building a new wall on the side of the steel structure away from the original masonry wall, forming a casting space between the new wall and the vertical groove, and installing tie bars on one side of the steel structure, and extending the tie bars into the new wall;

[0020] Concrete is poured in the pouring space, and the concrete is wrapped around the steel structure and the tie bars to consolidate and form a structural column.

[0021] The beneficial effects of the present invention are that the reinforcement and crack prevention structure for new and old walls reduces the extent of demolition of decorative surfaces and walls, maximizing the integrity of the original wall quality and reducing the economic and time costs of repair. The reinforcement and crack prevention structure for new and old walls reduces damage to the existing structure, lowering the risk of quality problems. It eliminates the need to demolish the original masonry wall, preventing vibration that could cause cracking. Post-tensioning of the new wall tightly anchors the old and new walls, preventing subsequent repairs of the decorative surface due to wall cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 Schematic diagram of the structure of the new and old wall reinforcement and crack prevention structure according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 Cross-sectional view at AA in.

[0025] Figure 3 Schematic diagram of the structure of the steel bar structure of the structural column according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Original masonry wall 1;

[0028] New wall 2;

[0029] Tie bars 3, limbs 31, pads 32, and limiters 33;

[0030] Structural column 4, vertical main reinforcement 41, stirrups 42. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Reference Figures 1 to 3 As shown, the present invention provides a new and old wall reinforcement and crack prevention structure, including: an original masonry wall 1, a new wall 2, tie bars 3, and structural columns 4.

[0034] In this embodiment, the original masonry wall 1 has one side and another side facing each other. A new wall 2 is built on one side of the original masonry wall 1. A gap is formed between the new wall and the original masonry wall for casting structural columns. The new wall 2 is arranged at an angle to the original masonry wall 1.

[0035] As a preferred embodiment, the new wall 2 is perpendicular to the original masonry wall 1 .

[0036] A vertical groove is provided on the side of the original masonry wall 1 facing the new wall 2. A casting space is formed between the vertical groove and the new wall 2. This casting space is used to cast structural columns. The structural columns connect the new wall and the original masonry wall.

[0037] The two ends of the tie bar 3 are bent to form two limbs 31. In this embodiment, the tie bar 3 and the limbs form a U-shaped structure (U-shaped square buckle). Figure 1 As shown, tie bars 3 are installed on opposite sides of the casting space. The original masonry wall 1 is perforated. These perforations connect to the bottom of the vertical grooves. A backing plate 32 is attached to the other side of the original masonry wall 1. The two legs 31 of the tie bars 3 on one side of the casting space pass through the perforations and connect to the backing plate 32. The two legs 31 of the tie bars 3 on the other side of the casting space extend into the new wall 2.

[0038] The structural column 4 includes a steel structure and concrete. The steel structure is disposed within a casting space. Opposite sides of the steel structure are connected to tie bars 3 on opposite sides of the casting space. Concrete is poured into the casting space and covers the steel structure and tie bars 3.

[0039] See Figure 3 As shown, the steel structure includes multiple vertical main bars 41 and multiple stirrups 42. The multiple vertical main bars 41 are vertically installed in the casting space. The multiple vertical main bars 41 are arranged along the circumference of the casting space. The stirrups 42 are fixed to the exterior of the multiple vertical main bars 41. A sleeve is formed between the tie bar 3 and the two limbs 31. The sleeve is installed on the multiple vertical main bars 41 on one side of the casting space.

[0040] As a preferred embodiment, the limb 31 is provided with a position-adjustable limiter 33 . The limiter 33 is attached to one side of the original masonry wall 1 .

[0041] In this embodiment, the limb 31 is formed with an external thread. The backing plate 32 and the limiting member 33 are respectively provided with threaded holes. The limb 31 is screwed into the threaded holes.

[0042] See Figure 1 As shown, a nut is screwed onto the end of the limb away from the tie bar. The nut presses against the pad.

[0043] After the tie bars are installed, cement mortar is poured into the holes and coated on the limbs 31 .

[0044] Combine Figure 2 and Figure 3 As shown, the tie bars 3 on opposite sides of the casting space are arranged alternately.

[0045] The present invention provides a construction method for reinforcing new and old walls and preventing cracking, comprising the following steps:

[0046] S1. A vertical groove and a through-hole are opened on one side of the original masonry wall 1, and the through-hole is connected to the bottom of the vertical groove.

[0047] S2. Insert the two limbs 31 of the tie bar 3 into the through hole and connect them with the pad 32.

[0048] S3. Tie a steel bar structure to one side of the original masonry wall 1 so that one side of the steel bar structure is connected to the tie bar 3.

[0049] S4. Build a new wall 2 on the side of the steel structure away from the original masonry wall 1, forming a casting space between the new wall 2 and the vertical groove. At the same time, install tie bars 3 on one side of the steel structure, and extend the tie bars 3 into the new wall 2.

[0050] S5. Pour concrete in the pouring space, and the concrete covers the steel structure and the tie bars 3 to consolidate and form the structural column 4.

[0051] The new and old wall reinforcement and crack prevention structure of the present invention is to reduce damage to the old walls and decorative surface layers, and reduce the economic and time costs of construction, maintenance, etc. incurred at one time. By optimizing the location of the structural columns during the construction process, the new walls are tied to the original masonry walls by post-tensioning the tie bars, and cement mortar is poured into the gaps between the holes to tightly combine the new and old walls, thereby avoiding quality problems such as wall cracking caused by insufficient wall bite.

[0052] The new and old wall reinforcement and crack prevention structure of the present invention refers to the prestressed concrete construction principle and adopts a post-tensioning construction method to tie the new and old walls together to avoid wall cracking caused by inconsistent settlement levels and other external factors.

[0053] The marking and positioning of the new and old wall junctions and wall thicknesses were carried out simultaneously with material preparation and tie reinforcement fabrication. The junctions between the new and old walls were chiseled, plastered, and vertical grooves were formed. At the same time, care was taken to protect the existing finish to reduce post-construction cracking and other quality risks.

[0054] The U-shaped tie bars on one side of the steel structure are made of C8 full-thread screws, with a spacing of 150mm and a layout spacing of 1000mm, staggered with the tie bars.

[0055] The tie bars on the other side of the reinforcement structure are C6 steel bars with a spacing of 600mm. The structural column stirrups are C8@200, and the structural column corner reinforcement is 4 C12 steel bars.

[0056] Use an impact drill to drill holes in the original masonry wall and pour M15 cement mortar through the holes to ensure they are densely filled. Then place the tie bars and tighten them with nuts.

[0057] Use alkali-resistant mesh cloth / wire mesh at the junction of new and old walls to prevent the surface layer from cracking.

[0058] Grooving the existing masonry wall (cutting the decorative surface layer, expanding 5-10cm on each side; chiseling the decorative layer within the groove area). Using a cutting machine, cut the existing masonry wall's plaster layer, with the cutting width 10-20cm larger than the newly added wall. Cut all the way to the masonry wall. Chisel away the plaster layer within the cutting area, make a second cut on the masonry wall, and chisel out a line groove the same width as the newly added masonry and 5cm deep.

[0059] From top to bottom on the original masonry wall, two holes of different diameters are drilled every 1m using a drill rig, and the spacing between the holes is consistent with the pitch of the tie bar.

[0060] The tie bars between the old and new walls are connected to the structural column reinforcement cage (U-shaped threaded tie bars are directly buckled to the structural column reinforcement cage. Tie bars can be customized in advance or processed on site)

[0061] The new and old wall reinforcement and crack prevention structure of the present invention reduces the scope of demolition of the decorative surface layer and the wall, ensures the integrity of the original wall to the maximum extent, and reduces the economic and time costs of repair.

[0062] The new and old wall reinforcement and crack prevention structure of the present invention reduces damage to the old structure, lowers the risk of quality problems, avoids demolition of the original masonry wall, avoids vibration of the original masonry wall, and avoids wall cracking; the newly added wall adopts post-tensioning to tightly anchor the new and old walls, avoiding the need for repair of the decorative surface layer due to subsequent wall cracking.

[0063] The materials used in the new and old wall reinforcement and crack prevention structure of the present invention are all main materials and auxiliary materials commonly used on construction sites, among which the rigging used as post-tensioning is the water pipe support material during the installation and construction process.

[0064] The embedded tie bars of the new and old wall reinforcement and crack prevention structure of the present invention exert pressure on the junction of the new and old walls, offsetting the cracking tendency caused by factors such as uneven settlement caused by inconsistent wall construction time and different material expansion coefficients in the later period.

[0065] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A new and old wall reinforcement and crack prevention structure, characterized in that: include: original masonry walls; A new wall is built on one side of the original masonry wall and is arranged at an angle to the original masonry wall. A vertical groove is opened on the side of the original masonry wall facing the new wall, and a casting space is formed between the vertical groove and the new wall; A tie bar, wherein both ends of the tie bar are bent to form two limbs, and the tie bars are respectively provided on opposite sides of the casting space. The original masonry wall is provided with a through hole, and a backing plate is attached to the other side of the original masonry wall. The two limbs of the tie bar on one side of the casting space pass through the through hole and are connected to the backing plate, and the two limbs of the tie bar on the other side of the casting space extend into the new wall. The structural column includes a steel bar structure and concrete. The steel bar structure is arranged in the casting space. The opposite sides of the steel bar structure are connected to the tie bars on the opposite sides of the casting space. The concrete is poured in the casting space and covers the steel bar structure and the tie bars.

2. The new and old wall reinforcement and crack prevention structure according to claim 1 is characterized in that: The steel structure includes multiple vertical main bars and multiple stirrups. The multiple vertical main bars are vertically arranged in the casting space and arranged along the circumferential direction of the casting space. The stirrups are fixed to the outside of the multiple vertical main bars. A sleeve is formed between the tie bar and the two limbs. The sleeve is sleeved on the multiple vertical main bars on one side of the casting space.

3. The new and old wall reinforcement and crack prevention structure according to claim 2 is characterized in that: The position of the limb is adjustable and a limiting piece is installed, and the limiting piece is attached to one side of the original masonry wall.

4. The new and old wall reinforcement and crack prevention structure according to claim 3 is characterized in that: The limb is formed with an external thread, the pad and the limiting member are respectively provided with threaded holes, and the limb is screwed into the threaded holes.

5. The new and old wall reinforcement and crack prevention structure according to claim 1 is characterized in that: Cement mortar is poured into the through hole, and the cement mortar is coated on the limb.

6. The new and old wall reinforcement and crack prevention structure according to claim 2 is characterized in that: The tie bars on opposite sides of the casting space are arranged alternately.

7. A construction method for reinforcing and preventing cracking of new and old walls according to any one of claims 1 to 6, characterized in that: The following steps are involved: A vertical groove and a through-hole are formed on one side of the original masonry wall, wherein the through-hole is connected to the bottom of the vertical groove; Insert the two limbs of the tie bar into the through hole and connect them to the pad; tying a steel bar structure on one side of the original masonry wall so that one side of the steel bar structure is connected to the tie bar; Building a new wall on the side of the steel structure away from the original masonry wall, forming a casting space between the new wall and the vertical groove, and installing tie bars on one side of the steel structure, and extending the tie bars into the new wall; Concrete is poured in the pouring space, and the concrete is wrapped around the steel structure and the tie bars to consolidate and form a structural column.

Images