CN202370165U - Prestressing force confined concrete member - Google Patents

Abstract

The utility model discloses a prestresssing force confined concrete member. Longitudinal reinforcements (2) and confining reinforcements (3) are arranged in a concrete member body (1), and prestressing tendons (4) parallel to the longitudinal reinforcements (2) are arranged in the confining reinforcements (3), and each of the prestressing tendons (4) is in a tensioning state. The prestresssing force confined concrete member has the advantages of being small in volume, light, high in intensity, low in cost of manufacturing, and also being small in the steel consumption, and easy to manufacture and the like.

Description

A prestressed concrete member

technical field

The utility model relates to a prestressed restrained concrete component for building, which belongs to the technical field of concrete component production.

Background technique

Concrete members have been widely used in structural engineering. At present, there are two types of concrete components in the prior art: non-prestressed and prestressed. The non-prestressed components have a large cross-section, a large amount of steel, and a large self-weight; prestressed components can reduce the cross-sectional area and steel consumption. However, the existing prestressed components usually need curved cables, and the concrete strength needs to be improved to meet the requirements of the prestressing and working conditions of the components; while the use of confined concrete is currently only to enhance the ductility of the components, and its strength Contributions above have not been utilized. Therefore, the use effect of existing concrete members is still not ideal enough.

Contents of the invention

The purpose of the utility model is to provide a prestressed restrained concrete member with small volume, light weight, high bearing capacity, high rigidity and low cost to overcome the deficiencies of the prior art.

The utility model is realized in the following way: a kind of prestressed restraint concrete component of the present utility model is that a longitudinal steel bar and a restraint steel bar are arranged in the concrete member, and a prestressed tendon parallel to the longitudinal steel bar is arranged in the restraint steel bar, and Each prestressed tendon is in tension.

When the restraining steel bars arranged in the concrete member are two or more layers, erecting bars that can be connected with the restraining steel bars on different layers are provided in the concrete member.

Sleeves are sheathed on the prestressed tendons.

Above-mentioned sleeve pipe is corrugated pipe, plastic pipe or rubber pipe.

Prestressed tendons are steel strands, steel wire bundles or high-strength steel bars.

Due to the adoption of the above-mentioned technical scheme, the utility model is a new structural form produced by combining the prestressed technology and the restrained concrete technology. The utility model configures restraining steel bars and prestressed tendons in the components, and applies prestress to the components, so that the restraining steel bars generate restraining force at the initial stage of stress, so as to improve the efficiency of restraint, and at the same time, replace some parts with prestressed tendons Stressed main ribs to achieve the purpose of improving material efficiency and reducing material consumption. The utility model combines the prestressing technology and the restrained concrete technology for the first time in the production of concrete components. By applying prestress, the restraint steel bar begins to generate restraint stress at the stage of component production, which improves the strength and ductility of concrete, and the application of prestress The crack resistance of concrete is improved, and at the same time, prestressed tendons can replace part of tensile steel bars. The components formed in this way have the advantages of high bearing capacity and high rigidity, and can effectively reduce the cross section of the component, reduce material consumption and reduce the cost of the component under the same bearing capacity condition. At the same time, the prestressed tendon adopts straight line cables, which reduces the difficulty of construction and is easy to operate. Therefore, compared with the prior art, the utility model not only has the advantages of smaller size, light weight, high bearing capacity, high rigidity, and low cost, but also has the advantages of easy construction and strong crack resistance of finished concrete components. Etc.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the sectional structure along line I-I of Fig. 1 .

Detailed ways

Below, the utility model will be further described in detail in conjunction with the accompanying drawings and embodiments.

Embodiment of the present utility model: when making the concrete member 1, the longitudinal steel bar 2 and the restraint steel bar 3 are arranged first; , and set erecting bars 6 (as shown in Figure 1 and Figure 2), connect each longitudinal steel bar 2 with restraining steel bars 3 (as shown in Figure 2), and then connect prestressed tendons 4 (prestressed tendons It can be made of steel strands, steel wire bundles or high-strength steel bars in the prior art) parallel to the longitudinal reinforcement 2 and pass through the restraint reinforcement 3, preferably the prestressed reinforcement 4 is arranged at the middle position of the restraint reinforcement 3; then according to the traditional Concrete is poured in the same way to form the required component shape. When the concrete strength reaches the design strength, the prestressed tendons 4 are stretched and anchored (the existing bonding and non-bonding processes can be used) to make The finished prestressed concrete member is obtained.

When burying the prestressed tendon 4, the casing 5 can be buried first to pass through the restraining steel bar 3, and the casing 5 can be made of an existing corrugated pipe, plastic pipe or rubber pipe; after the casing 5 is set, the concrete is poured To form the required component shape, then pull out the casing 5, so that a reserved hole that can pass through the prestressed tendons 4 will be formed in the concrete component 1 (the casing 5 may not be pulled out), and the concrete strength will reach the design strength. When the prestressed tendon 4 is passed through the reserved hole (or through the casing 5), each prestressed tendon 4 is tensioned and anchored, and then the reserved hole (or casing 5) and the prestressed tendon After grouting is carried out in the gap between 4, the finished prestressed concrete member can be produced.

When applying prestress to the prestressed tendons 4, the existing post-tensioning method is used for tensioning, so that the prestressed tendons 4 are bonded or unbonded prestressed tendons.

When anchoring the prestressed tendons 4, conventional anchors can be used for anchoring.

A kind of prestressed confinement concrete member of the present utility model made according to the above method is that a longitudinal reinforcement 2 and a restraint reinforcement 3 are arranged in the concrete member 1, and a prestressed reinforcement parallel to the longitudinal reinforcement 2 is arranged in the restraint reinforcement 3 4, and each prestressed tendon 4 is in tension.

When the restraining steel bars 3 arranged in the concrete member 1 have two or more layers, erecting bars 6 capable of connecting with the restraining steel bars 3 on different layers are provided in the concrete member 1 .

The prestressed tendons 4 in the above-mentioned concrete member 1 can be covered with sleeves 5 or not with sleeves 5 according to the needs of manufacture.

Claims (5)

1. prestressing force restriction concrete member; It is characterized in that: in concrete component (1), be provided with longitudinal reinforcement (2) and constraint reinforcing bar (3); And in constraint reinforcing bar (3), be provided with the presstressed reinforcing steel (4) that is parallel to longitudinal reinforcement (2), and every presstressed reinforcing steel (4) all is in tensioning state.

2. prestressing force restriction concrete member according to claim 1; It is characterized in that: the constraint reinforcing bar (3) that is arranged in the concrete component (1) when above, is provided with the bearing rod (6) that can be connected with the constraint reinforcing bar (3) on the different layers for two-layer or two-layer in concrete component (1).

3. prestressing force restriction concrete member according to claim 1 is characterized in that: on presstressed reinforcing steel (4), be with sleeve pipe (5).

4. prestressing force restriction concrete member according to claim 3 is characterized in that: sleeve pipe (5) is bellows, plastic pipe or rubber tube.

5. prestressing force restriction concrete member according to claim 1 is characterized in that: presstressed reinforcing steel (4) is steel strand, steel tendon or high tensile reinforcement.

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