CN103541559B - Reinforced composite board based on concrete bending member - Google Patents

Abstract

The invention relates to the technical field of building structure reinforcement, and provides a composite plate reinforced based on concrete bending members. This kind of composite plate reinforced by concrete flexural members is composed of two parts, one part is high-strength mortar, and the other part is prestressed fiber material. Fiber materials include carbon fiber sheets, glass fiber sheets, and the like. The high-strength mortar is connected with the fiber material through a certain number of special-shaped steel fibers to ensure the effective bonding of the fiber material and the high-strength mortar to form a new composite plate. The composite plate can effectively overcome the peeling damage of the fiber material after the structure is stressed due to the unevenness of the concrete surface, thereby greatly improving the strength utilization rate of the fiber and improving the reinforcement effect.

Description

A Composite Plate Based on Reinforcement of Concrete Flexural Members

technical field

The invention relates to the technical field of building structure reinforcement, in particular to a composite plate reinforced based on concrete bending members.

Background technique

Our country has passed the 60th anniversary of the founding of the People's Republic of my country, and a large number of buildings have exceeded the design reference period. These building structures and bridges already have potential safety hazards; The load borne by bridges is increasing day by day, which also causes damage to building structures and bridges; in addition, a large number of natural disasters will also cause damage to a large number of building structures and bridges to varying degrees. Therefore, strengthening these structures and restoring their necessary reliability has become an important work in the field of civil engineering. Among the current many structural reinforcement technologies, the fiber material reinforcement technology that has emerged in recent years has been widely used due to its unique advantages. The advantages of this reinforcement method are: light weight of the reinforcement material, high rigidity and strength of the structure after reinforcement, High corrosion resistance characteristics. However, this technology also has inherent defects. The concrete surface on which the fiber material is pasted is not smooth, and the thickness of the applied adhesive layer is usually difficult to guarantee. In this case, when the reinforced member continues to bear the load, the peeling failure of the fiber material often occurs, and the stress on the fiber material is usually at a low level when the peeling failure occurs, that is to say, the strength of the fiber material is not fully utilized. As a result, the effect of this reinforcement is greatly reduced. In order to overcome the problem of peeling damage, the fiber material is usually prestressed and stretched before pasting the fiber material. Due to the very low shear strength of the fiber, it is very difficult to stretch and anchor the fiber material, and the corresponding construction process is very complicated. . In order to make full use of the strength of fiber materials and simplify the construction process, it is urgent to develop a composite reinforced plate based on fiber materials.

Contents of the invention

The technical problem mainly solved by the invention is the problem that the fiber material is prone to peeling and damage in the reinforcement of the traditional concrete bending member. The composite board is formed by stretching the fiber material and compounding it with high-strength mortar, and then pasting it with the reinforced structure. Therefore, the problem of peeling damage of the fiber material is solved. Improve the bearing capacity of the reinforced structure, that is, the structure has sufficient reliability to meet the functional requirements of the structure.

The invention is a novel reinforced plate for concrete bending components, which is a reinforced plate formed by compounding pre-stretched fiber material and high-strength mortar. See Figure 1.

The fiber material (carbon fiber sheet, glass fiber sheet, etc.) is pre-tensioned by the machine, and the prestress value on the fiber material is controlled at 10MPa-40MPa, so that the fiber material can ensure its flatness under the action of pre-tension stress. Because the prestress value is at a low level, the requirements for the tensioning construction technology are not high, and no complicated tensioning machines are needed. See Figure 1.

Coat the reinforced organic glue on the fiber material in tension to ensure that the reinforced organic glue can fully penetrate into the fiber.

Before the initial setting of the reinforced organic glue, arrange steel fibers of a special shape on the fiber material, as shown in Figure 2, to ensure that the vertical height of each steel fiber is not less than 10mm after the steel fiber is bonded to the fiber material. At the height of the high-strength mortar, then evenly sprinkle the cleaned and dried mung bean sand (4-6mm coarse sand or pebbles) on the surface of the fiber material. And ensure that this operation is also completed before the initial setting of the reinforced organic glue, as shown in Figure 3.

After the final setting of the reinforced organic gel. Spread high-strength mortar on the mung bean sand, the strength of the high-strength mortar is not lower than M30, and the thickness is between 20mm and 30mm.

When the high-strength mortar reaches 70% of the design strength, the pre-tension force on the fiber material is removed, and the size of the formed composite plate is corrected.

Working mechanism of the present invention is briefly described as follows:

The main reason for the peeling failure of fiber materials on concrete flexural members is the unevenness of the flexural member's surface. In order to solve this problem, it is required that the fiber material is always in a straight state. In order to achieve this purpose, a pre-tension force is always applied to the fiber material during the production process of the reinforced composite plate to make it in a straight state. The pre-tension force applied to the fiber material should not be too large, otherwise deformation will occur on the formed composite sheet, and the pre-tension stress on the fiber material should be controlled within 10MPa-40MPa. Because of its low prestress value and low tension requirements, there is no need for complicated tensioning machines and tensioning processes. In order to ensure the effective bonding between the high-strength mortar and the fiber material, a certain shape of steel fiber (as shown in Figure 3) and mung bean sand are pasted on the fiber material. Among them, the role of mung bean sand is to increase the bonding of fiber materials and high-strength mortar. The role of steel fiber has two aspects. First, due to the special shape of steel fiber, one part can be bonded to the fiber material, and the other part can be anchored to the mortar, thereby increasing the connection between the fiber material and the high-strength mortar, ensuring two The materials work together; 2. The steel fiber part in the high-strength mortar can effectively prevent the generation and expansion of micro-cracks inside the matrix mortar material, and enhance the tensile, bending, impact and fatigue resistance of the high-strength mortar. It improves the strength and ductility of the high-strength mortar, and ensures that the fiber material can fully exert its own tensile strength.

Description of drawings:

Accompanying drawing 1 is the front elevation view and the side elevation view of the composite plate of the present invention.

Accompanying drawing 2 is the top view of the bonding situation of steel fiber and mung bean sand on the fiber material.

Accompanying drawing 3 is the right view of the bonding situation of steel fiber and mung bean sand on the fiber material.

Accompanying drawing 4 is the front view of the bonding situation of steel fiber and mung bean sand on the fiber material.

Figure 5 is a schematic diagram of the shape of the first steel fiber.

Accompanying drawing 6 is the schematic diagram of the shape of the second steel fiber.

In the figure: 1-high-strength mortar, 2-fiber material, 3-first steel fiber, 4-second steel fiber, 5-mung bean sand

Detailed ways:

The present invention will be further described in detail below in conjunction with specific implementation methods and accompanying drawings.

The first step is to apply prestress to the fiber material, anchor the two ends of the fiber material to the tensioning device, perform tension and ensure that the surface of the fiber material is straight, and stop the tension after reaching the prestress control value and maintain the prestress.

After the second step of stretching, a PVC template with high smoothness is placed on the lower part of the fiber material, and then the fiber is brushed and reinforced with organic glue, and a certain amount of special-shaped steel fiber and mung bean sand are pasted before the glue is initially set.

In the third step, after the final setting of the structural glue, smear high-strength mortar with a thickness of 20mm-30mm on the mung bean sand and carry out maintenance.

The fourth step is to wait until the high-strength mortar reaches 70% of the design strength, remove the prestress on the fiber material, check whether the fiber is smooth, and correct the size of the formed composite plate.

Claims (6)

1. based on a reinforced composite sheet material for concrete flexural member, it is characterized in that: described reinforced composite sheet material is made up of high-strength mortar and fibrous material; Described fibrous material is carbon fiber plate or glass fibre sheet; Be connected with steel fibre by reinforcing organic gel, mineral granule between high-strength mortar and fibrous material; Described connection procedure comprises:

To fibrous material Shi Hanzhang, then on fibrous material, organic gel is reinforced in brushing, pastes steel fibre, mineral granule before glue initial set, after reinforcing organic gel final set, spreads high-strength mortar, and carry out maintenance on mineral granule.

2. a kind of reinforced composite sheet material based on concrete flexural member according to claim 1, is characterized in that: the mortar strength of high-strength mortar is not less than M30.

3. a kind of reinforced composite sheet material based on concrete flexural member according to claim 1, it is characterized in that: fibrous material is in pre-tensile state all the time in the fabrication process, the pre-tensile stress on fibrous material controls at 10MPa-40MPa.

4. a kind of reinforced composite sheet material based on concrete flexural member according to claim 1, is characterized in that: the steel fibre height be pasted onto on fibrous material is not less than 10mm, and the length of steel fiber being namely anchored in high-strength mortar is not less than 10mm.

5. a kind of reinforced composite sheet material based on concrete flexural member according to claim 1, is characterized in that: paste steel fibre on fibrous material after, pastes mineral granule, before this process ensures that reinforcing organic gel is in initial set.

6. a kind of reinforced composite sheet material based on concrete flexural member according to claim 1, it is characterized in that: after pre-stretch-draw is carried out to fibrous material, in the PVC template that its underpart pad glazing slippery is high, this fibrous material when preventing smearing high-strength mortar on fibrous material, is caused to bend.