Prestressed steel strand tensioning construction rapid butt joint device

Abstract

The utility model discloses a prestressed steel strand tensioning construction quick butt joint device, solves the problem of bad clamping force between steel strand and clamping piece in the prior art. The device comprises an outer shell, a locking piece, a compression block and a gasket, the middle section of the outer shell is a conical cylinder gradually flared from the lower section to the upper section; the locking piece is located in the inner cavity of the upper section, and the needle-shaped body in the locking piece faces the small end of the conical cylinder, the compression block is mechanically fastened to the outer shell and axially fixed to the locking piece through the gasket arranged therebetween. By dispersing at the end of the steel strand and fixing the end under the action of the cement mortar and the locking piece and the compression block, after fixing, the dispersed steel wires are evenly distributed inside the outer shell and form a conical body, the tensile strength reaches and exceeds 100% of the ultimate strength of the steel strand itself, and the construction qualification rate is close to 100%.

Description

Technical Field

[0001] This utility model relates to the field of rapid connection technology for prestressed steel strand tensioning construction. Background Technology

[0002] In civil engineering, prestressed steel strand tensioning is required to improve the mechanical properties of reinforced concrete structures. For prestressed steel strand tensioning, rapid connection is actively pursued. Currently, the project team uses a "spring assembly + clamping plate" combination structure. During use, after the steel strand is inserted, the spring automatically presses the clamping plate, locking it using a wedge principle. During tensioning, the self-locking force is multiplied under the tensile force. Technical documents such as CN117627288A can be referenced for this structure and its technical effects. When the steel strand is inserted into the left clamping plate, the spring assembly presses the left clamping plate to the left, and as the left steel strand is stretched to the left, the left clamping plate further clamps the left steel strand. In actual use, this structure relies on clamping force between the clamping plate and the steel strand, depending on the friction and clamping force between them. During tensioning, slippage or even separation can occur between the steel strand and the clamping plate, leading to unreliable prestressed steel strand connections, i.e., insufficient tensile strength, requiring rework and affecting the construction progress. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a rapid docking device for prestressed steel strand tensioning construction, which solves the problem of poor clamping force between the steel strand and the clamping plates in existing technologies, and provides a rapid docking device with higher tensile strength.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0005] A rapid connection device for prestressed steel strand tensioning construction includes an outer shell, a locking element, a pressing block, and a gasket. The outer shell is composed of three sections: upper, middle, and lower. The middle section is a conical cylinder that gradually widens from the lower section to the upper section. The locking element is located in the inner cavity of the upper section, with its needle-like body facing the small end of the conical cylinder. The pressing block is mechanically fastened to the outer shell, and the locking element is axially fixed by a gasket positioned between them. The needle-like body exerts a squeezing action on the dispersed portion of the steel strand head, keeping the steel strand head in a dispersed state, ensuring that the steel wires are in a dispersed state and make sufficient contact with the cement mortar.

[0006] Furthermore, the clamping block is fixed to the upper section of the outer casing via a threaded connection, which facilitates rapid mechanical installation.

[0007] Furthermore, the gasket is an alloy copper gasket, which has good self-lubricating properties, facilitating the tightening action of the clamping block.

[0008] Furthermore, the locking element is composed of a cylinder and needle-like bodies, wherein the cylinder has multiple rings of needle-like bodies arranged sequentially from the center outwards.

[0009] Furthermore, the needle-like body is installed in the threaded hole of the cylinder through a threaded fit, or other mechanical fixing methods can be used, such as an overtight mechanical fit.

[0010] Furthermore, the length of the multiple rings of needle-like bodies decreases layer by layer from the center to the edge. This design makes the area occupied by the needle-like bodies on the cross-section proportional to the cross-sectional area of ​​the outer conical shell.

[0011] Furthermore, the cylinder is provided with three T-shaped slots, evenly distributed along the circumference, for the purpose of enabling rapid installation and localized adjustments.

[0012] Furthermore, a hexagonal bolt head is provided at the outer end of the clamping block as an operating end for external operation of the clamping block.

[0013] Furthermore, the inner cavity of the middle section of the outer shell is filled with quick-setting micro-expansion cement mortar and cured. The cured cement mortar, together with the needle-like bodies and steel wires, forms a conical solid with better tensile strength.

[0014] The beneficial effects of this utility model are:

[0015] This device disperses the steel strands at their ends and fixes them with cement mortar, locking components, and clamping blocks. After fixing, the dispersed steel wires are evenly distributed inside the outer shell and form a cone shape. Its tensile strength reaches and exceeds 100% of the steel strand's own ultimate strength. The non-destructive pass rate of the steel strands after construction is close to 100%.

[0016] After implementation of this technology, the dispersed steel wires are encased in a shell and cement mortar, remaining in a sealed state, achieving a lifespan design similar to that of concrete structures, and greatly improving corrosion resistance. The specific implementation details further elaborate on the technical advantages of this invention. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the device.

[0018] Figure 2 This is a partial cross-sectional view of the device.

[0019] Figure 3 This is a diagram showing the usage status of this device.

[0020] Figure 4 This is a cross-sectional view of the device.

[0021] Figure 5 This is a cross-sectional view of the middle section of the outer shell.

[0022] Figure 6 This is a three-dimensional view of the outer shell, showing the effect of rotational cross-section.

[0023] Figure 7 This is a three-dimensional view of the clamping block.

[0024] Figure 8 This is a three-dimensional view of the locking component.

[0025] Figure 9 The annular distribution of needle-like bodies in the locking component is shown.

[0026] Figure 10 This is a cross-sectional view of the locking component.

[0027] In the picture:

[0028] 10. Outer shell; 12. Middle section; 11. Lower section; 13. Upper section; 14. Process ring groove; 20. Locking element; 21. Needle-shaped body; 22. T-shaped slot; 30. Pressing block; 31. External thread; 32. Hex bolt head; 40. Washer; 50. Quick-setting micro-expansion cement mortar; 60. Steel strand; 61. Dispersion section. Detailed Implementation

[0029] Rapid docking device for prestressed steel strand tensioning construction, surface bonding Figures 1-10 The structure, locking principle and construction process of this utility model are described in detail.

[0030] The device consists of four components: an outer shell 10, a locking element 20, a pressing block 30, and a gasket 40. During the use of the device, a quick-setting micro-expansion cement mortar 50 is applied. The pressing block 30 presses the locking element 20 through the gasket 40. During the pressing process, the needle-like body 21 squeezes and disperses the dispersed steel wires at the head of the steel strand 60, forming a fluffy dispersed part 61. With the assistance of the quick-setting micro-expansion cement mortar 50, it achieves rapid curing and completes the rapid connection of the ends of the steel strand 60.

[0031] In this embodiment, the outer shell 10 consists of three sections: upper, middle, and lower. These sections are designed with approximately equal thickness. The middle section 12 is a conical cylinder, and the lower section 11 has a smaller diameter. The lower section 11 contains a sleeve structure of equal diameter, the inner diameter of which is approximately equal to the diameter of the steel strand 60, allowing the steel strand 60 to pass quickly through the inner cylinder of the lower section 11. The upper section 13 has a larger diameter, and its inner cylinder is divided into upper and lower parts by a process annular groove 14. The upper part is a threaded section for mounting the clamping block 30, while the lower part is a smooth inner cylinder for sliding engagement with the locking element 20. A gasket 40, preferably made of alloy copper, is placed between the locking element 20 and the clamping block 30.

[0032] The locking element 20 in this device consists of a cylinder and a needle-like body 21. The cylinder has multiple rings of needle-like bodies 21 arranged sequentially from the center outwards, with one needle-like body 21 positioned at the center. Specifically, the manufacturing process involves drilling and threading a hole in the cylinder, and then tightening the threaded section of the rear end of the needle-like body 21 into the threaded hole of the cylinder. In other words, the needle-like body 21 is fixed to the cylinder through a threaded fit.

[0033] To elaborate further, the needle-like bodies 21 mentioned above have different lengths, and the specific pattern is as follows: Centered on the centerline of the cylinder's axis, the needle-like body 21 in the middle is the longest, its length being roughly equivalent to the length of the middle section of the outer shell 10. Furthermore, the length of the needle-like bodies 21 decreases layer by layer towards the edge from this center. (Refer to...) Figures 8-10 In this embodiment, the needle-like body 21 is provided in three layers, with the length of each layer gradually decreasing from the inner circle to the outer circle. Each needle-like body 21 has a sharp tip, which fills the gaps between the dispersed steel wires at the end during use, causing the end of the steel strand 60 to expand.

[0034] Furthermore, a T-shaped slot 22 is provided on the cylinder of the locking member 20. A tool with a T-shaped end is used to hold the T-shaped slot 22 and operate the locking member 20 to place it inside the outer casing 10. This is an installation auxiliary structure.

[0035] The clamping block 30 is a metal part with an external thread 31 on its outer surface. The clamping block 30 is installed in the upper section of the housing 10 via a threaded connection and is installed in the upper section of the housing 10 by tightening. During the process of gradually tightening the clamping block 30, the clamping block 30 gradually pushes and achieves the clamping of the locking member 20.

[0036] A hexagonal bolt head 32 is provided at the outer end of the clamping block 30, and the locking block is locked by an electric wrench.

[0037] The construction method for this device is as follows:

[0038] S1: Pass the steel strand 60 through the inner channel of the outer casing 10 from the lower section 11 to the upper section 13, and after passing it out, disperse the ends of the steel strand 60 by unbundling within a five-centimeter length of the ends to disperse the steel wires at the ends.

[0039] S2: Apply a small amount of quick-setting micro-expansion cement mortar 50 to the dispersed part 61 at the end of the steel strand 60, and gently pull it to retract the dispersed end into the outer shell 10, and wait for it to be fixed.

[0040] S3: Then, insert the locking member 20 so that the needle-like body 21 of the locking member 20 acts on the end of the steel strand 60. Then, insert the gasket 40. Finally, install the clamping block 30 inside the outer casing 10 by tightening it. During the process of gradually tightening the clamping block 30, the clamping block 30 gradually pushes and achieves the clamping of the locking member 20.

[0041] S4: After 12 hours of curing, when the quick-setting micro-expansion cement mortar 50 has gradually hardened, the prestressed steel strand tensioning construction can be carried out. Specifically, the steel strand 60 is hydraulically stretched from the other end. During the stretching process, the end of the steel strand 60 and its fixing structure inside the outer shell 10 form a conical structure and there will be no relative slippage. Therefore, the connection operation of this prestressed steel strand is simpler, more efficient, more reliable, and improves the construction quality.

[0042] In this structure, the quick-setting micro-expansion cement mortar 50 gradually compacts during the locking process of the clamping block 30, increasing the strength at the ends, so that the steel strand 60 can be stretched to form prestress without detaching.

Claims

1. A rapid connection device for prestressed steel strand tensioning construction, comprising an outer shell (10), a locking element (20), a clamping block (30), and a gasket (40), characterized in that: The outer shell (10) is composed of three sections: upper, middle and lower. The middle section (12) is a conical cylinder that gradually widens from the lower section (11) to the upper section (13). The locking member (20) is located in the inner cavity of the upper section (13), and the needle-like body (21) in the locking member (20) faces the small end of the conical cylinder. The pressing block (30) is mechanically fastened to the outer shell and the locking member (20) is axially fixed by the gasket (40) set between the two. The needle-like body (21) has a squeezing action on the dispersed part of the steel strand head.

2. The rapid connection device for prestressed steel strand tensioning construction according to claim 1, characterized in that, The clamping block (30) is fixed to the upper section of the outer shell (10) by a threaded connection.

3. The rapid connection device for prestressed steel strand tensioning construction according to claim 1, characterized in that, The gasket (40) is an alloy copper gasket.

4. The rapid connection device for prestressed steel strand tensioning construction according to claim 1, characterized in that, The locking member (20) is composed of a cylinder and needle-like bodies (21), wherein the cylinder has multiple rings of needle-like bodies (21) arranged sequentially from the center outward.

5. The rapid connection device for prestressed steel strand tensioning construction according to claim 4, characterized in that, The needle-like body (21) is installed in the threaded hole of the cylinder by a threaded fit.

6. The rapid connection device for prestressed steel strand tensioning construction according to claim 5, characterized in that, The length of the multi-ringed needle-like body (21) decreases layer by layer from the center to the edge.

7. The rapid connection device for prestressed steel strand tensioning construction according to claim 6, characterized in that, The cylinder is provided with a T-shaped slot (22).

8. The rapid connection device for prestressed steel strand tensioning construction according to claim 1, characterized in that, A hexagonal bolt head (32) is provided at the outer end of the clamping block (30).

9. The rapid connection device for prestressed steel strand tensioning construction according to claim 1, characterized in that, The inner cavity of the middle section of the outer shell (10) is filled with quick-setting micro-expansion cement mortar (50) and then cured.

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