CN101250886B - Method for reinforcing masonry structure building base - Google Patents

Abstract

The invention discloses a method of reinforcing a masonry structure building foundation, which is that a reinforced concrete slab is cast on an original building foundation and is connected with an original foundation together to form a raft foundation to resist uneven settlement. The implementation method is that the foundation is excavated to an appointed depth, two channel steels are arranged on the two sides of the original foundation, an anchor is used to pass through a foundation anchorage channel steel, the two ends of a mesh reinforcement in the concrete slab are welded on the flange of the channel steel, and then the concrete slab is cast. The reinforcing method changes the form of the foundation, the channel steel and the anchor are closely connected with the foundation, the force transmission is guaranteed, thereby forming the raft foundation whose whole stiffness is large. The method has the advantages that the whole performance is excellent, foundation soil is not disturbed when constructing, and the using is flexible and the like. The method is suitable to integrally reinforce an ancient architecture foundation of a masonry structure with protection value, thereby reducing the harmful effect which is produced by the uneven settlement of the foundation to the building.

Description

A method for strengthening the foundation of a masonry structure building

technical field

The invention relates to a method for strengthening the foundation of a building with a masonry structure, which is suitable for overall reinforcement of the building foundation with a masonry structure, and belongs to the field of civil engineering.

Background technique

At present, our country is in a period of large-scale civil engineering construction. Excavation of foundations of many new buildings, tunnel excavation, etc. often lead to uneven settlement of adjacent building foundations. It is fatal and can cause load-bearing walls to crack, tip and even collapse. The masonry structure occupies a very important position in the structural engineering of our country. Many ancient masonry structures represent the civilization level of an era, witness the development of history, and have high cultural relic value and ornamental value. Therefore, It is necessary to reinforce the foundations of masonry structures that have conservation value. In addition, when the foundation of the original masonry structure cannot meet the new requirements, the foundation also needs to be reinforced. The existing main foundation reinforcement techniques include: underpinning reinforcement method, foundation reinforcement reinforcement method, increasing foundation cross-sectional area, deepening foundation method, pile underpinning method, pit static pressure pile pit method, etc., and there are many patented technology. For example, patent application 95112401.3 proposes a building foundation reinforcement method for replacing original pile caps with indoor static pressure piles, patent application 200510033300.0 proposes a building water-filled rectification and foundation reinforcement method, and patent application 200610104414.4 proposes a The invention discloses a method for reinforcing and underpinning the foundation of an existing building by adopting a pilot-pit type manual excavation pile. The above method is more convenient and effective for the reinforcement of the concrete structure foundation, but for the masonry foundation of ancient buildings, there are many problems in the reinforcement of the existing technology:

1. Most of the masonry ancient buildings with protection value are mostly strip foundations of masonry structure, and there is no ring beam. It is difficult to directly support the foundation when using existing technologies such as foundation underpinning or deepening method for reinforcement. It is easy to cause disturbance and damage to the foundation.

2. Due to the particularity of the masonry structure, the newly added part is not easy to be closely connected with the original foundation to bear the force together, it is difficult to ensure the integrity of the foundation and a good stress state, and it is difficult to guarantee the quality of reinforcement. The reinforcement effect is poor.

3. Most masonry buildings with protection value have a relatively strong foundation due to their long history. Many existing technologies such as foundation underpinning and foundation deepening methods often need to be excavated to the bottom of the basement, which requires a large amount of engineering and will Disturb the originally solid soil and have adverse effects on the structure.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a new method for strengthening the foundation of a masonry structure building. By casting a reinforced concrete raft on the original building foundation, the raft is surrounded by the original foundation through anchor rods and The channel steel connection forms a raft foundation with high overall rigidity together with the original foundation to reduce uneven settlement.

The present invention provides the method for strengthening the foundation of a masonry structure building comprising the following steps:

(1) Excavate the foundation. Excavate the ground to the appropriate depth to expose the foundation and clean the surface. Level the interior floor.

(2) Install the anchor rod. Punch holes at appropriate positions on both sides of the masonry foundation, use anchor rods to pass through the foundation, and inject high-strength inorganic pouring material into the holes to ensure that the holes are dense.

(3) Install channel steel. In step (2), channel steel is installed on both sides of the foundation. There are reserved holes on the channel steel for anchor rods to pass through, and then the channel steel is anchored to the foundation with nuts, and high-strength inorganic steel is injected between the channel steel and the foundation. Filling material to ensure compactness.

(4) Arrange the steel mesh. The raft reinforcement mesh is directly arranged on the leveled indoor ground, and the two ends of the reinforcement are welded to the channel steel at the flange.

(5) Cast-in-place concrete. Pouring concrete to the specified elevation, leveling and curing, and then backfilling or other repairs.

Install channel steel on both sides of the original foundation, and use anchor rods to pass through the foundation to anchor the channel steel. In order to ensure that the channel steel and the anchor rod are closely connected with the foundation, high-strength inorganic pouring material is poured into the hole and between the channel steel and the foundation.

The present invention has the following advantages:

1. The reinforcement method provided by the present invention adopts anchor rods and channel steels to connect the foundation with the cast-in-place raft, changes the stress form of the original foundation, and forms a new raft foundation with high rigidity and good integrity. Through the anchor rod pair passing through the foundation and the channel steel, the force transmission can be ensured through the pin bolt action of the anchor rod, and the reinforcement effect can be guaranteed. The reinforcement method has a very significant effect on alleviating the influence of the uneven settlement of the foundation on the building.

2. Most of the existing foundation reinforcement technologies require excavation below the base elevation, which greatly disturbs the soil and affects the reinforcement effect. However, the reinforcement method proposed in the present invention uses anchor rods to pass through the foundation side for connection, and does not require Excavation below the base level will have little impact on the old soil below. When the foundation depth is large and the wall is in good condition, the excavation depth can be reduced, and anchors can be used to pass through the wall for reinforcement without going through the foundation.

3. The application is flexible, and the entire masonry foundation can be reinforced as a whole, or it can be reinforced for a certain part.

4. The construction is convenient and simple, no large equipment is required, and the construction period is short.

Description of drawings

Fig. 1 is a structural schematic diagram of a masonry structure building foundation reinforced by the inventive method.

FIG. 2 is a sectional view of A-A in FIG. 1 .

In the figure: 1. foundation, 2. original foundation, 3. anchor rod, 4. channel steel, 5. steel mesh, 6. cast-in-place concrete, 7. backfill, 8. hole, 9. inorganic pouring material.

Detailed ways:

This embodiment is a plan for strengthening the masonry foundation of a cultural relic protection building by using the method for strengthening the foundation of a masonry structure building according to the present invention, as shown in Fig. 1 and Fig. 2 . The present invention will be further described below in conjunction with the accompanying drawings.

1. Check and evaluate the status quo of the building, and determine the thickness and embedment depth of the concrete raft slab by referring to the corresponding specifications according to the settlement degree of the foundation 1, the stress status and the status quo of the original foundation 2. Excavate the ground to expose the foundation 2, and level the indoor ground.

2. Calculate and determine the installation position and quantity of anchor rods 3 according to conditions such as foundation conditions, stress conditions, material dimensions, and structural requirements. Drill holes 8 on the original foundation 2, use anchor rods 3 to pass through the foundation and inject high-strength inorganic pouring material into the holes to ensure that the holes are dense. In order to reduce disturbance to the foundation, the openings should be staggered up and down.

3. Process the channel steel 4 according to the length of the foundation and the position of the hole, then use nuts to anchor the channel steel 4 on the original foundation 2, and inject high-strength inorganic pouring material 9 between the channel steel 4 and the original foundation 2 to ensure the strength transfer. The channel steel 4 is provided with a reserved hole for the anchor rod 3 to pass through.

4. Arrange the raft reinforcement mesh 5 directly on the leveled indoor ground, and weld the two ends of the reinforcement with the channel steel 4 at the flange.

5. Pouring concrete 6 to the specified elevation, leveling and curing.

6. After the concrete curing is completed, backfill the ground with backfill soil 7 to the specified indoor elevation.

Claims (2)

1. A method for strengthening the foundation of a masonry structure building, characterized in that it may further comprise the steps: (1) Excavate the foundation, excavate the ground to expose the masonry foundation, clean the surface, and level the indoor ground; (2) Install anchor rods, perforate holes on both sides of the masonry foundation, use anchor rods to pass through the masonry foundation through the holes, and then inject inorganic pouring material into the holes to ensure that the holes are dense; (3) Install the channel steel, install the channel steel on the two sides of the masonry foundation in step (2), then use the nut to anchor the channel steel on the masonry foundation, and then inject inorganic Filling material to ensure compactness; (4) Arrange steel mesh, arrange raft steel mesh directly on the leveled indoor ground, and weld the two ends of the steel bar with the channel steel at the flange; (5) In-situ pouring of concrete, pouring concrete to the specified elevation, leveling and curing, and then backfilling or other repairs. 2. The method for strengthening the foundation of a masonry structure building according to claim 1, characterized in that: the channel steel is provided with a reserved hole for the anchor rod to pass through.

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