A steel bar reverse tensioning connection ring suitable for assembled pavement

Abstract

The present invention discloses a steel bar reverse tensioning connection ring suitable for prefabricated pavements, comprising a tensioning ring and a fastening device; the tensioning ring is provided with steel bar insertion holes radially opposite to each other; the fastening device axially fastens the steel bar, and realizes axial limitation in combination with the steel bar insertion holes and the steel bars in contact with each other. The connection ring described in the present invention has a simple structure and a small volume. The connection ring has low requirements for construction accuracy when connecting steel bars. It can be conveniently applied to prefabricated pavement construction and has strong applicability. The connection ring described in the present invention adopts a separate assembled force transmission structure. Through the fastening structure design, the force of the contact between the steel bars and the limiting design are utilized to achieve better horizontal and vertical force transmission and force-bearing effects. The connection ring can improve the integrity of the prefabricated pavement and provide a new steel bar force transmission connection method for the prefabricated pavement.

Description

Technical Field

[0001] The present invention belongs to the field of road engineering construction and pavement joint connection, and particularly relates to a steel bar reverse tensioning connection ring suitable for assembled pavements. Background Art

[0002] The joints of road panels are an important component of rigid pavement and the weakest link of the entire pavement structure. Their load transfer capacity directly affects the performance of the pavement structure. If the joints have a large load transfer capacity, the pavement structure is close to a continuous plate without joints; if the joints have a small load transfer capacity, the pavement structure is close to a four-sided free plate.

[0003] With the increasing maturity of mechanical lap joints, the use of straight threaded sleeves to connect rebar can effectively transmit force horizontally and vertically. However, straight threaded sleeve connections require high construction precision. Prefabricated pavement panels are large precast concrete components, making precise control difficult during construction. The application of straight threaded sleeves to dowel rod connections in prefabricated pavements has been less effective. Furthermore, the use of wet joints in prefabricated pavement joints requires overcoming issues such as fatigue damage to the bonding material and reduced force transmission. Solving the load transfer problem in prefabricated pavement joints while reducing the construction precision requirements is a pressing issue in the treatment of force transmission connections in prefabricated pavements. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a steel bar reverse tensioning connection ring suitable for prefabricated pavements. The device can reduce the requirements for construction accuracy of mechanical overlap of force transmission rod steel bars, and achieve the effect of horizontal and vertical force transmission. The device is small in size and has little impact on construction.

[0005] The technical solutions provided by the present invention are as follows:

[0006] A steel bar reverse tensioning connection ring suitable for assembled pavement comprises a tensioning ring and a fastening device; the tensioning ring is provided with steel bar insertion holes radially opposite to each other; the fastening device axially fastens the steel bar and realizes axial limitation in combination with the steel bar insertion holes and the steel bars in contact with each other.

[0007] Furthermore, the tensioning ring is a double-layer structure symmetrical along the radial plane, and the double-layer structure is detachably fixedly connected.

[0008] Furthermore, the double-layer structure of the tension ring is connected by bolts.

[0009] Furthermore, the diameter of the steel bar insertion hole is slightly larger than the diameter of the steel bar.

[0010] Furthermore, the steel bar insertion hole can bear the radial force of the steel bar by setting the thickness.

[0011] Furthermore, the steel bar insertion hole is square or circular.

[0012] Furthermore, the fastening device is a threaded fixing device, and the outer diameter of the fastening device is slightly larger than the diameter of the steel bar insertion hole.

[0013] Furthermore, the fastening device includes a nut and a washer, and the washer is placed between the nut and the steel bar penetration hole.

[0014] Furthermore, the connecting ring is made of high-strength steel.

[0015] The present invention also provides the use of the tensioning connecting ring as a steel bar connecting ring in the construction of an assembled pavement.

[0016] Beneficial effects of the present invention:

[0017] (1) The connecting ring of the present invention has a simple structure and a small size. The connecting ring has low requirements on construction accuracy when connecting steel bars. It can be conveniently applied to prefabricated pavement construction and has strong applicability.

[0018] (2) The connecting ring of the present invention adopts a separate assembled force transmission structure. Through the fastening structure design, the force of the mutual contact of the steel bars and the limit design, it can achieve good horizontal and vertical force transmission and force bearing effects.

[0019] (3) The connecting ring described in the present invention adopts a separable structure, which can be assembled into one piece for fixed force transmission connection of movable steel bars, and can be separated for horizontal and vertical force transmission connection of fixed steel bars. It optimizes the limitations of traditional sleeves on steel bar connection working conditions and has a wider range of applications.

[0020] (4) The connecting ring described in the present invention adopts a separate structure, which is easy to operate and is applied to the connection of the force transmission rods of the assembled road surface. It can improve the disassembly of the assembled road panel and meet the requirements of the integrated disassembly of the assembled road panel, and has a better application prospect.

[0021] (5) The connecting ring described in the present invention is made of high-strength steel and has high structural strength. When used for connecting assembled pavement force transmission rods, it is less susceptible to fatigue damage from the environment and vehicle loads, and the flatness and continuity of the joints are better.

[0022] (6) The connecting ring described in the present invention, as a new method for processing joints of prefabricated pavements, has the function of transmitting force horizontally and vertically, thereby improving the structural integrity of the prefabricated pavement and improving road performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the connecting ring of the present invention.

[0024] Figure 2 It is a schematic diagram of the decomposition of the connecting ring of the present invention.

[0025] Figure 3This is a schematic diagram of assembling the connection loop panel of the present invention.

[0026] In the figure: 0-tensioning ring, 1-lower tensioning ring, 11-rebar insertion hole, 12-bolt punching hole, 2-upper tensioning ring, 3-bolt, 4-nut, 5-gasket, 6-rebar, 7-road panel, 71-road panel reserved groove. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

[0028] Example

[0029] like Figure 1 、 2 As shown, a steel bar reverse tensioning connection ring suitable for assembled pavement includes a tensioning ring 0 and a fastening device.

[0030] The tensioning ring 0 is a radially symmetrical double-layer structure, comprising a lower tensioning ring 1 and an upper tensioning ring 2. Bolt holes 12 are punched in the upper and lower tensioning rings and are secured by threaded bolts 3. A square rebar insertion hole 11 is radially provided within the tensioning ring. The inner diameter of the rebar insertion hole 11 is slightly larger than the rebar diameter, and its perimeter is integrally formed with the tensioning ring.

[0031] The fastening device includes a nut 4 and a washer 5. After the rebar is inserted through the rebar insertion hole 11, the washer is inserted and then threaded into the pre-reinforced thread of the rebar via the nut 4 to achieve fastening. The outer diameter of the washer 5 is larger than the outer diameter of the rebar insertion hole 11 to provide a position limit.

[0032] In this embodiment, the rebar 6 connected by the tensioning ring has a diameter of 28 mm. The tensioning ring is made of high-strength steel. The combined thickness of the upper and lower layers is 10 mm, with a single layer thickness of 5 mm and a width of 10 mm. The curved portion has an arc angle of 120° and an inner diameter of 66 mm. The hollow rectangle inside the rebar insertion hole 11 is 36 mm long and 29 mm wide, while the outer rectangle is 56 mm long, 49 mm wide, and 10 mm thick. The bolt punch hole 12 is located at the center of the curved structure and has a diameter of 5 mm.

[0033] Bolt 3 has a diameter of 5mm and a length of 15mm. Nut 4 is a hexagonal structure with an inner diameter of 28mm, a diagonal diameter of 40mm, and a length of 30mm. Washer 5 is a hollow circular structure with an inner diameter of 28mm, an outer diameter of 48mm, and a thickness of 5mm. The dimensional parameters of these components can be flexibly adjusted according to actual construction conditions.

[0034] The connecting ring is made of 45# high quality carbon steel plate by wire cutting, meeting the requirements of GB699-88, with tensile strength ≥600MPa, yield strength ≥355MPa, elongation ≥16%, and section shrinkage ≥16%.

[0035] Installation and construction method of the tensioning connection ring:

[0036] like Figure 2 、 3 As shown, first place the lower tensioning ring 1 in the reserved groove 71 of the initial road panel, and insert the gasket 5 and the nut 4 into the force transfer rod steel bar 6 of the initial road panel according to the operating sequence; then align the joints of the road panel to be assembled with the initial road panel to ensure that the force transfer rod steel bars 6 of the two road panels can be placed in the lower tensioning ring steel bar penetration hole 11, and make the two relative steel bars in close axial contact; then splice the upper tensioning ring with the lower tensioning ring, and use the bolt 3 to fix the tensioning ring as a whole; finally, lock the nut to bear the force to complete the splicing, and the reserved joints of the road panel can be filled with prefabricated blocks or quick-setting materials.

[0037] In this embodiment, the road panel 7 has a size of 2000 mm×2000 mm×220 mm, and the road panel reserved groove 71 has a size of a semi-cylinder with a diameter of 160 mm and a height of 160 mm.

[0038] This connecting ring is a prefabricated assembly structure, and the connecting devices are all detachable to meet the requirements of repeated use. The removal of the connecting ring is the reverse order of installation.

[0039] The tensioning connection ring described in this embodiment can continuously form a tight and secure connection when connecting two Φ28 steel bars, thereby achieving continuous tensioning.

[0040] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A steel bar reverse tensioning connecting ring suitable for assembled pavement, characterized in that: It includes a tensioning ring and a fastening device; the tensioning ring is provided with steel bar insertion holes radially opposite to each other; the fastening device axially fastens the steel bar, and realizes axial limitation in combination with the steel bar insertion holes and the steel bars in contact with each other; the tensioning ring is a double-layer structure symmetrical along the radial plane, and the double-layer structure is connected by bolts; the fastening device is a threaded fixing device, and the outer diameter of the fastening device is slightly larger than the diameter of the steel bar insertion hole.

2. The tensioning connection ring according to claim 1, characterized in that: The diameter of the steel bar penetration hole is slightly larger than the diameter of the steel bar.

3. The tension connection ring according to claim 1, characterized in that: The steel bar penetration hole can bear the radial force of the steel bar by setting the thickness.

4. The tensioning connection ring according to claim 1, characterized in that: The steel bar insertion hole is square or circular.

5. The tension connection ring according to claim 1, characterized in that: The fastening device comprises a nut and a washer, wherein the washer is placed between the nut and the steel bar penetration hole.

6. Use of the tensioning connecting ring according to any one of claims 1 to 5 as a steel bar connecting ring in prefabricated pavement construction.

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