Pre-stressed beam tension end reinforced anti-cracking steel sleeve

Abstract

The utility model relates to the field of precast beam especially relates to a precast beam tensioning end reinforcing anti -cracking steel sleeve, a precast beam tensioning end reinforcing anti -cracking steel sleeve, include: steel sleeve, its sleeve is equipped with the protective cylinder, buffer piece is set up on the protective cylinder, buffer piece is provided with several, and inner tube sets up in the steel sleeve. Through steel sleeve, protective cylinder, buffer piece and inner tube cooperation to precast beam tensioning end weak spot inside reinforcing protection, and through protective cylinder and buffer piece to the vibration and impact that produces when stripping are buffered, thereby avoid precast beam tensioning end weak spot cracking, and in subsequent precast beam anchoring and anchoring complete cutting steel strand, all can pass through protective cylinder and buffer piece to the vibration and impact that produces are buffered, thereby realize to precast beam tensioning end weak spot reinforcing anti -cracking effect.

Description

Technical Field

[0001] This utility model relates to the field of precast beams, and in particular to a steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam. Background Technology

[0002] Precast beams refer to concrete beam components that are prefabricated in a factory and then transported to the construction site for installation. They utilize mobile platforms, hydraulic formwork, intelligent vibration systems, and steam curing processes to automate the entire process of steel reinforcement processing, pouring, curing, tensioning, and grouting. Among these components, the tensioned prestressing tendons are a key part of the precast beam. By applying pressure beforehand, they improve the beam's crack resistance, stiffness, and load-bearing capacity, making them widely used, especially in long-span bridges or high-load scenarios. However, weak points often exist at the tensioning end of precast beams. During demolding, prestressing tendon threading, and cutting of steel strands after anchoring, these weak points are easily subjected to vibration and impact, posing a risk of cracking. Therefore, there is an urgent need for a reinforcement and crack prevention device for the tensioning end of precast beams. Utility Model Content

[0003] To overcome the disadvantage that the weak parts at the tensioning end are easily subjected to vibration and impact during demolding, prestressing tendon threading, and anchoring and cutting of steel strands, which may lead to cracking, this utility model provides a steel sleeve for reinforcing and preventing cracking at the tensioning end of precast beams.

[0004] The technical solution of this utility model is: a steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam, comprising: a steel sleeve on which a protective sleeve is fitted; a buffer element disposed on the protective sleeve, wherein a plurality of buffer elements are disposed; and an inner sleeve disposed inside the steel sleeve.

[0005] More preferably, both the protective cylinder and the inner cylinder are fixed to the steel sleeve by sealant.

[0006] More preferably, the buffer element is a corrosion-resistant rubber ring.

[0007] More preferably, both the protective cylinder and the exposed surfaces of the inner cylinder are coated with polytetrafluoroethylene.

[0008] More preferably, the protective sleeve is made of corrosion-resistant rubber.

[0009] More preferably, it also includes a protective ring fixed to the left side of the steel sleeve and a protective plate disposed on the protective ring.

[0010] More preferably, the protective sheet has several reinforcing members fixed to its right side.

[0011] More preferably, the reinforcement is an alloy spring.

[0012] More preferably, the protective sheet is provided in various specifications and is used as a kit with the reinforcement component. The protective sheet is detachably connected to the protective ring. The protective ring is provided with an annular groove. The upper and lower parts of the protective sheet are provided with injection holes communicating with the annular groove.

[0013] More preferably, the outer ring surface of the protective ring is set as a slope that is lower on the left and higher on the right.

[0014] Beneficial effects: During demolding, the protective sheet protects the surface of the weak part of the precast beam at the tensioning end. The steel sleeve, protective sleeve, buffer, and inner cylinder work together to reinforce and protect the inside of the weak part of the precast beam at the tensioning end. The protective sleeve and buffer buffer also buffer the vibration and impact generated during demolding, thereby preventing cracking of the weak part of the precast beam at the tensioning end. Furthermore, during the subsequent anchoring of the precast beam and the cutting of the steel strands after anchoring, the protective sleeve and buffer buffer can also buffer the vibration and impact generated, thus achieving the effect of reinforcing and preventing cracking of the weak part of the precast beam at the tensioning end. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the protective ring and protective plate assembly of this utility model; Figure 3 This is an enlarged view of area A of this utility model.

[0016] In the attached diagram, the following are the reference numerals: 1-steel sleeve, 2-protective sleeve, 3-buffer, 4-inner cylinder, 5-protective ring, 51-annular groove, 6-protective plate, 61-injection hole, and 7-reinforcing component. Detailed Implementation

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] Example A precast beam tensioning end reinforcement and crack prevention steel sleeve 1, according to Figures 1-3 As shown, it includes: A steel sleeve 1, on which a protective sleeve 2 is fitted; Buffer element 3 is disposed on the protective cylinder 2, and several buffer elements 3 are provided; and Inner cylinder 4 is disposed inside the steel sleeve 1.

[0019] The protective cylinder 2 and the inner cylinder 4 are both fixed to the steel sleeve 1 by sealant. The protective cylinder 2 and the inner cylinder 4 protect the outer and inner ring surfaces of the steel sleeve 1 to prevent corrosion of the steel sleeve 1.

[0020] The buffer element 3 is configured as a corrosion-resistant rubber ring.

[0021] The exposed surfaces of both the protective cylinder 2 and the inner cylinder 4 are coated with polytetrafluoroethylene, which enhances the corrosion resistance of the protective cylinder 2 and the inner cylinder 4 and indirectly improves the protection effect on the steel sleeve 1.

[0022] The protective cylinder 2 is made of corrosion-resistant rubber.

[0023] It also includes a protective ring 5 fixed to the left side of the steel sleeve 1 and a protective plate 6 disposed on the protective ring 5.

[0024] Several reinforcing members 7 are fixed to the right side of the protective plate 6 to enhance the fixing effect between the protective plate 6 and the concrete.

[0025] The reinforcement component 7 is configured as an alloy spring.

[0026] The protective plate 6 is available in various sizes and is used as a kit with the reinforcement 7. The protective plate 6 is detachably connected to the protective ring 5. The protective ring 5 is provided with an annular groove 51. The upper and lower parts of the protective plate 6 are provided with injection holes 61 that communicate with the annular groove 51.

[0027] The outer ring of the protective ring 5 is set as a slope that is lower on the left and higher on the right.

[0028] Before the precast beam is poured, a protective plate 6 of the corresponding specification is selected according to the width of the weak part at the tension end of the precast beam. After the protective plate 6 is installed in the preset position on the protective ring 5, sealant is injected into the injection hole 61 at the upper part of the protective plate 6 through an external glue injector until sealant flows out of the injection hole 61 at the lower part. At this time, it means that the annular groove 51 has been filled with sealant to ensure the sealing effect. At the same time, when the excess sealant overflows from the annular groove 51, it flows down the inclined surface of the outer ring of the protective ring 5 into the contact surface between the protective ring 5 and the protective plate 6, further improving the sealing effect and preventing water and corrosive media from penetrating into the concrete through the pores due to poor sealing at the joint. Thus, during the use of the precast beam after pouring, the protective plate 6 protects the weak part at the tension end and reduces the probability of cracking. The reinforcement 7 enhances the stability of the connection between the protective plate 6 and the concrete. Then, on the outer ring surface of the protective cylinder 2... The right side is coated with sealant, and two steel sleeves 1 are fitted over the prestressing tendons and inserted into both ends of the corrugated pipe. The right side of the outer ring of the protective sleeve 2 is bonded and sealed to the corrugated pipe, so that the two steel sleeves 1 replace the two ends of the corrugated pipe of the precast beam. During casting, the two protective plates 6 at both ends are flush with the end face of the precast beam, facing away from each other. During demolding, the protective plates 6 protect the surface of the weak part of the tension end of the precast beam. The steel sleeves 1, protective sleeves 2, buffers 3 and inner cylinders 4 work together to reinforce and protect the inside of the weak part of the tension end of the precast beam. The protective sleeves 2 and buffers 3 buffer the vibration and impact generated during demolding, thereby preventing cracking of the weak part of the tension end of the precast beam. When the prestressing tendons are threaded and the steel strands are cut after anchoring, the protective sleeves 2 and buffers 3 can also buffer the vibration and impact generated, thereby achieving the effect of reinforcing and preventing cracking of the weak part of the tension end of the precast beam.

[0029] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent substitutions made within the principles of this utility model should be included within the protection scope of this utility model. Contents not described in detail in this utility model are existing technologies known to those skilled in the art.

Claims

1. A steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam, characterized in that, include: A steel sleeve, on which a protective sleeve is fitted; A buffer element is disposed on the protective cylinder, and several buffer elements are disposed thereon; and The inner cylinder is located inside the steel sleeve.

2. The steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam according to claim 1, characterized in that, Both the protective cylinder and the inner cylinder are fixed to the steel sleeve by sealant.

3. The steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam according to claim 1, characterized in that, The buffer element is a corrosion-resistant rubber ring.

4. The steel sleeve for reinforcing and preventing cracking at the tensioning end of a precast beam according to claim 1, characterized in that, Both the protective cylinder and the inner cylinder have a polytetrafluoroethylene coating on their exposed surfaces.

5. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to any one of claims 1-4, characterized in that, The protective sleeve is made of corrosion-resistant rubber.

6. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to claim 1, characterized in that, It also includes a protective ring fixed to the left side of the steel sleeve and a protective plate disposed on the protective ring.

7. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to claim 6, characterized in that, Several reinforcing parts are fixed to the right side of the protective plate.

8. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to claim 7, characterized in that, The reinforcement component is an alloy spring.

9. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to claim 7, characterized in that, The protective sheet is available in various sizes and is used as a kit with the reinforcement component. The protective sheet is detachably connected to the protective ring. The protective ring has an annular groove, and the upper and lower parts of the protective sheet are provided with injection holes that communicate with the annular groove.

10. A precast beam tensioning end reinforcement and crack prevention steel sleeve according to claim 9, characterized in that, The outer ring of the protective ring is designed as a slope that is lower on the left and higher on the right.

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