A structure and method for reinforcing existing masonry wall nodes using pre-tightening anchoring method

Abstract

The present invention discloses a structure and method for reinforcing existing masonry wall nodes using a pre-tightened anchoring method, comprising a first anchor bolt and a second anchor bolt connected by a pre-tightened spring; a first lattice column upright and a second lattice column upright for mounting the first and second anchor bolts; an anchor head latch for anchoring the second anchor bolt to the side of the second lattice column upright facing away from the wall; and implementation steps including drilling holes, connecting the anchor bolt mechanism, installing the anchor bolt mechanism, grouting, sealing the holes, and welding. Compared with the prior art, the present invention utilizes a steel-brick composite column reinforcement principle, with a clear structural principle and reliable technology. The components are simple to process, requiring no nuts or screws for fastening, making material acquisition convenient, construction simple, highly maneuverable, and fast. The invention also causes minimal damage to the original structure, generates little construction waste, and causes minimal environmental pollution.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structures, and in particular relates to a structure and method for reinforcing existing masonry wall nodes by utilizing a pre-tightening anchoring method. Background Art

[0002] Masonry, as a traditional architectural form with a long history, holds a crucial position in various types of buildings in my country. Due to its readily available materials, low cost, and simple construction, as well as its excellent strength, durability, fire resistance, thermal insulation, and aesthetic appeal, masonry structures using masonry as load-bearing components will remain the predominant structural form in my country for a considerable period of time, particularly in the construction of small and medium-sized cities and new rural areas.

[0003] However, most masonry structures built in my country in the 1960s and 1970s have reached their design lifespans. Some masonry structures are partially aged, with severe weather erosion and structural degradation, making them unable to meet new seismic fortification requirements. This has led to increasingly prominent structural safety issues. Long-term disrepair and potential renovations that don't meet regulatory requirements have reduced the overall load-bearing and seismic performance of masonry structures. From a seismic perspective, masonry structures are highly susceptible to brittle failure under strong earthquakes, leading to building collapse and causing significant casualties and economic losses in earthquake-affected areas. Historical earthquake damage data also demonstrates that masonry structures suffer more severe damage than other structures. This is particularly true in rural areas, where many houses are self-built by farmers and lack professional structural design, posing significant safety risks. With age, both mortar and brick strength deteriorate and weaken, significantly reducing the safety and reliability of the structures and increasing the risk of collapse.

[0004] The reinforcement of existing masonry structures mainly includes foundation reinforcement, wall reinforcement, and floor (staircase) reinforcement. In wall reinforcement, small wall limbs, small brick columns, and brick nodes often do not meet the needs of reinforcement. The pre-tightened anchoring method is used for reinforcement. Its main advantages are: no bolts are required, the technology is reliable, the materials are easy to obtain, the construction is simple, the operability is strong, the cost is economical, and it is easy to promote. It has important practical significance for the current large-scale inspection, appraisal and reinforcement work of self-built houses.

[0005] As for the reinforcement method of existing walls, the current main approach is to use additional structural columns and single-sided or double-sided concrete slab walls. The disadvantages of this reinforcement method are large investment and large construction workload. Due to the increase in wall thickness, the usable area of ​​the building is reduced. Summary of the Invention

[0006] The present invention adopts a pre-tightening anchoring method to reinforce nodes in existing masonry structure walls to form a steel lattice column-brick combined load-bearing component. The purpose is to invent an anchoring method for reinforcing wall nodes with simple construction and small impact.

[0007] A structure for reinforcing existing masonry wall nodes using a pre-tightening anchoring method, comprising:

[0008] The first anchor bolt and the second anchor bolt are used to be set in the wall drill hole and are connected by a pre-tightened spring;

[0009] The first lattice column upright plate and the second lattice column upright plate are used to be arranged on both sides of the wall and to install the first anchor bolt and the second anchor bolt;

[0010] An anchor head pin, used for anchoring the second anchor bolt on a side of the second lattice column vertical plate away from the wall surface;

[0011] A method for reinforcing an existing masonry wall node using a pre-tightening anchoring method, characterized by comprising the following steps:

[0012] S1: Drilling: Draw reinforcement marking lines on the wall according to the size of the reinforcement nodes, mark the locations where holes need to be drilled, and then carry out the wall drilling operation;

[0013] S2: Connect the anchor bolt assembly, the first anchor bolt, the preload spring and the second anchor bolt are sequentially connected into a whole;

[0014] S3: Install the anchor bolt assembly, insert the non-prestressed spring connection end of the second anchor bolt through the first lattice column plate, the wall drill hole, and the second lattice column plate in sequence, and anchor the second anchor bolt to the outer side of the second lattice column plate with the anchor head pin; multiple anchor bolt assemblies are provided on the wall;

[0015] S4: Grouting: Fill the wall holes with grout through the reserved grouting holes;

[0016] S5: Sealing the hole: after the grouting is completed, the grouting hole is sealed;

[0017] S6: Welding: weld the horizontal gusset plate to the first lattice column plate of multiple anchor assemblies on one side of the wall, weld the horizontal gusset plate to the second lattice column plate of multiple anchor assemblies on the other side of the wall, weld the diagonal gusset plate to the first lattice column plate of multiple anchor assemblies on one side of the wall, and weld the diagonal gusset plate to the second lattice column plate of multiple anchor assemblies on the other side of the wall.

[0018] Compared with the prior art, the present invention has the following characteristics:

[0019] 1. The reinforcement principle is steel-brick composite columns, with clear structural principles and reliable technology;

[0020] 2. The components are easy to process and do not require nuts or screws for fixing. The materials are easy to obtain, the construction is simple, the operability is strong, and the construction speed is fast.

[0021] 3. It has little damage to the original structure, produces less construction waste, and has little pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the elevation drawing of the node in the middle of the wall;

[0023] Figure 2 for Figure 1 The cross-section diagram of the position node 1-1;

[0024] Figure 3 (a) is a schematic structural diagram of the first anchor bolt;

[0025] Figure 3 (b) is a schematic structural diagram of the second anchor bolt;

[0026] Figure 3 (c) is a schematic structural diagram of the second lattice column vertical plate;

[0027] Figure 3 (d) is a schematic diagram of the structure of the T-shaped steel plate anchor pin;

[0028] In the attached figure: 1-first lattice column plate, 2-first anchor bolt, 3-horizontal gusset plate, 4-wall drilling hole, 5-second anchor bolt, 6-T-shaped steel plate anchor head pin, 7-pre-tightening spring, 8-wall, 9-second lattice column plate, 10-grouting hole, 11-diagonal gusset plate. DETAILED DESCRIPTION

[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments. There are three main types of existing masonry structure node reinforcement: mid-wall, cross-wall, and L-shaped at the corner of a wall. These three types of wall node reinforcement utilize similar structures and methods using pre-tightening anchoring. This article will now use the mid-wall node as an example for illustration.

[0030] Use pre-tightening anchoring method to strengthen the middle node of the wall. Figures 1-2 As shown, its structure mainly includes a first lattice column plate 1, a first anchor bolt 2, a horizontal gusset plate 3, a wall drill hole 4, a second anchor bolt 5, a T-shaped steel plate anchor head pin 6, a preloaded spring 7, a wall 8, a second lattice column plate 9, a grouting hole 10, and a diagonal gusset plate 11.

[0031] The wall is provided with a wall borehole 4 for receiving a first anchor bolt 2, a second anchor bolt 5, and a preload spring 7. One end of the first anchor bolt 2 and one end of the second anchor bolt 5 are elastically connected by a preload spring 7. The first lattice column plate 1 and the second lattice column plate 9 are respectively attached to the opposite sides of the wall. The other end of the first anchor bolt 2 is a square platform that can be clamped on the side of the first lattice column plate 1 away from the wall. The other end of the second anchor bolt 5 is anchored to the side of the second lattice column plate 9 away from the wall via a T-shaped steel plate anchor head pin 6. Grouting holes 10 are provided in the wall for injecting grout into the wall borehole 4 through the grouting holes 10. The horizontal gusset plate 3 is arranged horizontally and is connected to the two first lattice column plates 1 and the two second lattice column plates 9 by three-sided circumferential welding. The diagonal gusset plate 11 is arranged at a certain angle and is connected to the two first lattice column plates 1 and the two second lattice column plates 9 by three-sided circumferential welding.

[0032] The horizontal gussets 3 are 5mm thick and 50mm wide, while the diagonal gussets are 5mm thick and 50mm wide. The first lattice column uprights 1 and second lattice column uprights 9 are 5mm thick and 50mm wide. The first lattice column uprights 1, horizontal gussets 3, second lattice column uprights 9, and diagonal gussets 11 can also be factory-fabricated to the required dimensions and shipped to the site for integrated installation, improving efficiency.

[0033] Before reinforcement, all the plaster layers on the masonry surface need to be scraped off cleanly. After the wall pretreatment is completed, the specific implementation steps are as follows:

[0034] S1: Drilling. According to the size of the reinforcement node, draw the reinforcement marking line on the wall, mark the location where the hole needs to be drilled, and then perform the wall drilling operation 4 times. The hole diameter is 50mm. After the drilling is completed, use a brush to clean the hole.

[0035] S2: Connect the anchor bolt assembly, use the pre-tightening spring 7 to connect the first anchor bolt 2 and the second anchor bolt 5, and connect the non-pre-tightening spring 7 connection end of the second anchor bolt 5 to the tractor.

[0036] S3: Install the anchor bolt assembly. The tractor is connected to drive the non-prestressed spring connection end of the second anchor bolt 5 to pass through the first lattice column plate 1, the wall drill hole 4, and the second lattice column plate 9 in sequence. The second anchor bolt 5 is anchored to the outer side of the second lattice column plate 9 with the anchor head pin 6. Multiple anchor bolt assemblies are provided on the wall.

[0037] S4: Grouting: Fill the wall drilling hole 4 with grout through the reserved grouting hole 10 until grout overflows from the gap of the steel plate on the opposite side of the wall hole, and then the grouting is completed.

[0038] S5: Sealing the hole. After the grouting is completed, the grouting hole 10 is sealed with epoxy resin. The diameter of the grouting hole 10 in this embodiment is 30 mm.

[0039] S6: Welding: On-site, a three-sided circumferential welding process is used to weld the horizontal gusset plate to the first lattice column plate of the multiple anchor bolt assemblies on one side of the wall. Similarly, on the other side of the wall, the horizontal gusset plate is welded to the second lattice column plate of the multiple anchor bolt assemblies, securing the horizontal gusset plate and the multiple anchor bolt assemblies together. Similarly, a diagonal gusset plate is welded to the first lattice column plate of the multiple anchor bolt assemblies on one side of the wall, and to the second lattice column plate of the multiple anchor bolt assemblies on the other side of the wall.

[0040] The present invention aims to provide a method for reinforcing wall joints in existing masonry structures using a preloaded anchoring method to construct steel lattice column-brick composite components. The key technology is the use of preloaded springs to secure the lattice columns, followed by grouting anchoring. The entire process requires no bolts, and all connectors and rods can be prefabricated and standardized in a factory, achieving an assembled masonry reinforcement structure. Furthermore, on-site construction is simple, and quality control is readily available. This method has significant practical value and potential for widespread adoption in the reinforcement and renovation of a large number of existing masonry structures.

[0041] The present invention can be used for reinforcing buildings such as primary and secondary school buildings, hospital wards, residences, office buildings, and self-built houses.

Claims

1. A structure for reinforcing existing masonry wall nodes using a pre-tightening anchoring method, characterized in that: include: a first lattice column upright plate, a second lattice column upright plate, and at least one set of anchor bolt assemblies; The anchor assembly includes: The first anchor bolt and the second anchor bolt are arranged in the drilled hole of the wall and are connected by a pre-tightened spring; The first lattice column upright plate and the second lattice column upright plate are respectively used to be arranged on two sides of the wall and are respectively used to install the first anchor bolt and the second anchor bolt; An anchor head pin, used for anchoring the second anchor bolt on a side of the second lattice column vertical plate away from the wall surface; The first lattice column plate and the second lattice column plate serve as welding points for wall reinforcement connection; One end of the first anchor bolt is configured as a square platform for clamping the first anchor bolt on the side of the first lattice column vertical plate away from the wall surface, and the other end is a semicircular structure; both ends of the second anchor bolt are semicircular structures; The lattice column uprights are connected by horizontal tie plates and diagonal tie plates to increase the stability of the lattice column uprights.

2. The structure for reinforcing existing masonry wall nodes using a pre-tightening anchoring method according to claim 1, characterized in that: The horizontal gusset plate is arranged horizontally, and its two ends are respectively connected to the two first lattice column uprights or the two second lattice column uprights; the oblique gusset plate is arranged obliquely, and its two ends are respectively connected to the two first lattice column uprights or the two second lattice column uprights.

3. The structure for reinforcing existing masonry wall nodes using a pre-tightening anchoring method according to claim 1, characterized in that: The anchor head pin is a T-shaped anchor head pin.

4. A method for reinforcing existing masonry wall nodes using a pre-tightening anchoring method, characterized in that: The following steps are involved: S1: Drilling: Draw reinforcement marking lines on the wall according to the size of the reinforcement nodes, mark the locations where holes need to be drilled, and then carry out the wall drilling operation; S2: Connect the anchor bolt assembly, the first anchor bolt, the preload spring and the second anchor bolt are sequentially connected into a whole; S3: Install the anchor bolt assembly, insert the non-prestressed spring connection end of the second anchor bolt through the first lattice column plate, the wall drill hole, and the second lattice column plate in sequence, and anchor the second anchor bolt to the outer side of the second lattice column plate with the anchor head pin; multiple anchor bolt assemblies are provided on the wall; S4: Grouting: Fill the wall holes with grout through the reserved grouting holes; S5: Sealing the hole: after the grouting is completed, the grouting hole is sealed; S6: Welding: weld the horizontal gusset plate to the first lattice column plate of multiple anchor assemblies on one side of the wall, weld the horizontal gusset plate to the second lattice column plate of multiple anchor assemblies on the other side of the wall, weld the diagonal gusset plate to the first lattice column plate of multiple anchor assemblies on one side of the wall, and weld the diagonal gusset plate to the second lattice column plate of multiple anchor assemblies on the other side of the wall.

5. The method for reinforcing existing masonry wall nodes using a pre-tightening anchoring method according to claim 4, characterized in that: In the drilling step, after the drilling is completed, the hole needs to be cleaned.

6. The method for reinforcing existing masonry wall nodes using a pre-tightening anchoring method according to claim 4, characterized in that: During the installation of the anchor bolt assembly, the non-preloaded spring connection end of the second anchor bolt is connected to the tractor, and driven by the tractor, passes through the first lattice column plate, the wall drill hole, and the second lattice column plate.

7. The method for reinforcing existing masonry wall joints using a pre-tightening anchoring method according to claim 4, characterized in that: During the grouting step, the grouting is completed until slurry overflows from the gaps in the steel plates on the opposite side holes of the wall.

Images