Prefabricated box culvert steel bar self-positioning device and installation method thereof

Abstract

The application discloses a prefabricated box culvert steel bar self-positioning device and a mounting method thereof, and belongs to the technical field of prefabricated box culverts. The device comprises a prefabricated concrete box body and longitudinal bars embedded in the prefabricated concrete box body. One end of the longitudinal bars is embedded in the prefabricated concrete box body, and the other end of the longitudinal bars extends from one end surface of the prefabricated concrete box body in the longitudinal direction. A steel bar self-positioning assembly is arranged at the other end of the prefabricated concrete box body and corresponds to the longitudinal bars. The steel bar self-positioning assembly comprises an axial abutting device, an outer sleeve and an inner inserting rod. A plug hole is formed in the end surface of the prefabricated concrete box body. The axial abutting device is arranged in the plug hole, and the inner end of the inner inserting rod is matched with the axial abutting device. The device can facilitate the positioning of the prefabricated box culvert steel bars. Through the self-positioning effect, the assembling efficiency of the prefabricated box culvert can be greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of precast box culvert technology, specifically relating to a precast box culvert steel bar self-positioning device and its installation method. Background Technology

[0002] Box-type reinforced concrete culverts, also known as square reinforced concrete culverts, are simply called "box culverts" or "square culverts" because of their rectangular or square cross-sectional shape. As casings for municipal utility pipelines, box culverts are simple, convenient, and space-efficient due to their straight-walled square inner cross-section and the installation of supports on the side walls for laying cables, water supply, heating, or other pipelines.

[0003] In the current technology for positioning precast box culverts, the precast reinforcing bars of one precast box culvert are typically inserted into the reinforcing bar holes of the other precast box culvert to be connected, and then connected to the reinforcing bar sleeve. Because the reinforcing bar sleeve and the precast reinforcing bars need to be connected by threads or cast in place, it makes it difficult to position the reinforcing bars of the precast box culvert and results in low assembly efficiency. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a precast box culvert steel bar self-positioning device, which can facilitate the positioning of precast box culvert steel bars and greatly improve the assembly efficiency of precast box culverts through the self-positioning effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention relates to a precast box culvert reinforcement self-positioning device, comprising a precast concrete box body and longitudinal reinforcements embedded in the precast concrete box body. One end of each longitudinal reinforcement is embedded in the precast concrete box body, and the other end extends longitudinally from one end face of the precast concrete box body. A reinforcement self-positioning component is provided at the other end of the precast concrete box body corresponding to the longitudinal reinforcement. The reinforcement self-positioning component includes an axial clamping device, an outer cylinder sleeve, and an inner rod. An insertion hole is formed on the end face of the precast concrete box body. The axial clamping device is disposed in the insertion hole. The inner end of the inner rod cooperates with the axial clamping device, and the outer end of the inner rod passes through the outer cylinder sleeve. A compression spring is provided between the outer cylinder sleeve and the inner rod. A central portion of the inner rod extends outward integrally with a... A support rod perpendicular to its axis has an opening groove at the inner end of the outer cylinder sleeve corresponding to the support rod. A first sliding groove is provided on the outer side of the support rod, and a first slider is slidably sealed within the first sliding groove. A steel bar channel is provided at the center of the outer end of the inner insertion rod, and a second sliding groove is provided on the inner wall of the steel bar channel. A second slider is slidably sealed within the second sliding groove. The first sliding groove and the second sliding groove are connected by a hydraulic oil channel, which is filled with hydraulic oil. A retaining groove corresponding to the support rod is provided at the inner end of the outer cylinder sleeve. After the support rod is disengaged from the opening groove and rotated, the axial clamping device clamps the support rod into the retaining groove, detachably connecting the inner insertion rod to the precast concrete box.

[0007] Furthermore, a first spring is provided in the first sliding groove, and the first slider is connected to the bottom of the first sliding groove through the first spring; a second spring is provided in the second sliding groove, and the second slider is connected to the bottom of the second sliding groove through the second spring.

[0008] Furthermore, at least two sets of the second slider are arranged along the axial direction of the rebar channel. The second slider has a right-angled trapezoidal structure, with the inclined surface of the second slider facing the side where the rebar channel is located, and the larger end of the second slider facing the inner end of the rebar channel.

[0009] Furthermore, the compression spring is sleeved on the outside of the inner insert rod, and a step is formed on the outside of the inner insert rod to cooperate with the compression spring. A space is formed between the outer cylinder sleeve and the inner insert rod for installing the compression spring.

[0010] Furthermore, the inner insert extends outward with a limiting rod perpendicular to its axis, and the limiting rod is located inside the support rod.

[0011] Furthermore, the axial clamping device includes a steel sleeve fixedly installed in the insertion hole and a spring steel sheet fixedly installed at the bottom of the inner side of the steel sleeve. The outer wall of the steel sleeve is provided with external threads, and the inner end of the inner insertion rod is fixedly provided with an end head, which is slidably installed in the steel sleeve.

[0012] Furthermore, the outer cylinder is threadedly connected to a limiting plate, which has an installation hole. The limiting plate is connected to the end face of the precast concrete box through the installation hole.

[0013] Furthermore, a cable is provided between the steel sleeve and the limiting plate, and an anchor head for fixing the cable is provided on the limiting plate.

[0014] The installation method of the precast box culvert reinforcement self-positioning device adopts the precast box culvert reinforcement self-positioning device described in any of the above-mentioned methods. The precast concrete box body is precast in the factory, and longitudinal bars and reinforcement self-positioning components are respectively set at both ends of the precast concrete box body. After the precast concrete box body is hoisted, it is assembled longitudinally. When the longitudinal bar is inserted into the reinforcement channel, the longitudinal bar can drive the inner insertion rod to move axially. During the continuous displacement process, the support rod is dislodged from the opening slot. After dislodging, it is rotated 90° and then pressed against the slot, so that the inner insertion rod is detachably connected to the precast concrete box body.

[0015] Furthermore, the support rod is pressed against the slot by an axial clamping device.

[0016] The beneficial effects of this invention are as follows:

[0017] The present invention relates to a self-positioning device for reinforcing bars in box culverts. By setting longitudinal bars and a self-positioning component for reinforcing bars at both ends of a precast concrete box, the longitudinal bars are directly inserted into the self-positioning component and automatically positioned by the self-positioning component when splicing two adjacent precast concrete boxes, which can greatly improve the assembly efficiency.

[0018] In this invention, the hydraulic oil channel is filled with hydraulic oil. After the precast concrete box is hoisted and assembled, when the longitudinal reinforcement is inserted into the steel bar channel, the longitudinal reinforcement can drive the inner insertion rod to move axially. During the continuous displacement process, the support rod comes out from the opening slot. After coming out, it is rotated 90°, and then the axial clamping device clamps the support rod in the slot, detachably connecting the inner insertion rod to the precast concrete box, realizing the fixation after positioning. The whole process is simple, the longitudinal reinforcement after positioning is not easy to loosen, and the positioning is more stable.

[0019] In the device of this invention, the alignment or misalignment between the support rod and the opening slot can be achieved by directly rotating the inner rod, which facilitates the disassembly of the device. The ease of disassembly makes the adjustment after positioning easier, shortens the construction period, and saves on the later maintenance and adjustment costs.

[0020] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0022] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0023] Figure 2 This is a perspective view of the rebar self-positioning component of the present invention;

[0024] Figure 3 This is a side view of the rebar self-positioning component of the present invention;

[0025] Figure 4 This is a cross-sectional view of the rebar self-positioning component of the present invention;

[0026] Figure 5 for Figure 4 Enlarged view at point A.

[0027] The following are the markings in the attached diagram: 1. Precast concrete box body; 2. Longitudinal reinforcement; 3. Reinforcing bar self-positioning assembly; 4. Axial clamping device; 5. Outer cylinder sleeve; 6. Inner insert rod; 7. Insertion hole; 8. Compression spring; 9. Support rod; 10. Opening groove; 11. First sliding groove; 12. First slider; 13. Reinforcing bar channel; 14. Second sliding groove; 15. Second slider; 16. Hydraulic oil channel; 17. Slot; 18. First spring; 19. Second spring; 20. Step; 21. Limiting rod; 22. Steel sleeve; 23. Spring steel sheet; 24. End; 25. Limiting plate; 26. Mounting hole; 27. Cable; 28. Anchor head. Detailed Implementation

[0028] like Figure 1 As shown, the precast box culvert reinforcement self-positioning device of the present invention includes a precast concrete box body 1 and longitudinal reinforcement 2 embedded in the precast concrete box body 1. The precast concrete box body 1 is square, and the longitudinal reinforcement 2 is arranged along the longitudinal direction of the precast concrete box body 1. It is pre-embedded in the precast concrete box body 1 at the factory. The longitudinal direction mentioned here refers to the length extension direction of the precast concrete box body 1 during assembly. One end of the longitudinal reinforcement 2 is embedded in the precast concrete box body 1, and the other end extends from one end face of the precast concrete box body 1 longitudinally and extends at least 10cm. Corresponding to the longitudinal reinforcement 2, a reinforcement self-positioning component 3 is provided at the other end of the precast concrete box body 1. The reinforcement self-positioning component 3 cooperates with the longitudinal reinforcement 2 for positioning.

[0029] In embodiments of the present invention, such as Figure 2-4 As shown, the rebar self-positioning assembly 3 includes an axial clamping device 4, an outer cylinder sleeve 5, and an inner rod 6. An insertion hole 7 is formed on the end face of the precast concrete box 1, and the insertion hole 7 is also arranged along the longitudinal direction of the precast concrete box 1. The axial clamping device 4 is fixedly installed in the insertion hole 7. The inner end of the inner rod 6 cooperates with the axial clamping device 4. After the inner rod 6 is in place, the axial clamping device 4 is used to provide an outward pre-tightening force to the inner rod 6. The outer end of the inner rod 6 passes through the outer cylinder sleeve 5. A compression spring 8 is provided between the outer cylinder sleeve 5 and the inner rod 6. The compression spring 8 is used to provide a certain elastic pre-tightening force between the outer cylinder sleeve 5 and the inner rod 6, and can also play a partial connection role.

[0030] Specifically, in this invention, such as Figure 2 and 5 As shown, the inner rod 6 extends outward from the middle of a support rod 9 perpendicular to its axis. The inner end of the outer cylinder sleeve 5 has an opening groove 10 corresponding to the support rod 9. The support rod 9 has a first sliding groove 11 on the outer side, and a first slider 12 is slidably sealed in the first sliding groove 11. A steel bar channel 13 is opened at the center of the outer end of the inner rod 6. A second sliding groove 14 is opened on the inner wall of the steel bar channel 13, and a second slider 15 is slidably sealed in the second sliding groove 14. The first sliding groove 11 and the second sliding groove 14 are connected by a hydraulic oil channel 16, which is filled with hydraulic oil. The inner end of the outer cylinder sleeve 5 has a retaining groove 17 corresponding to the support rod 9. After the support rod 9 is disengaged from the opening groove 10 and rotated, the axial clamping device 4 clamps the support rod 9 in the retaining groove 17, thus detachably connecting the inner rod 6 to the precast concrete box 1.

[0031] In this embodiment, a first spring 18 is provided in the first sliding groove 11, and the first slider 12 is connected to the bottom of the first sliding groove 11 through the first spring 18. The first spring 18 is used to restrict the first slider 12 within the first sliding groove 11 to prevent it from coming out of the first sliding groove 11. A second spring 19 is provided in the second sliding groove 14, and the second slider 15 is connected to the bottom of the second sliding groove 14 through the second spring 19. Similarly, the second spring 19 is used to restrict the second slider 15 within the second sliding groove 14 to prevent it from coming out of the second sliding groove 14. Through the action of the first spring 18 and the second spring 19, the balance of the two sliders at both ends of the hydraulic oil channel 16 can also be maintained, making it easier to insert the reinforcing bar.

[0032] In this embodiment, at least two sets of second sliders 15 are arranged along the axial direction of the rebar channel 13. The second sliders 15 have a right-angled trapezoidal structure, with the inclined surface of the second sliders 15 facing the side where the rebar channel 13 is located, and the larger end of the second sliders 15 facing the inner end of the rebar channel 13. Thus, the second sliders 15 are inverted cones. After the rebar is inserted, the inverted cone shape makes it more difficult for it to come out, resulting in better initial positioning effect.

[0033] In this embodiment, the compression spring 8 is sleeved on the outside of the inner insert rod 6. A step 20 is formed on the outside of the inner insert rod 6 to cooperate with the compression spring 8. A space is formed between the outer cylinder sleeve 5 and the inner insert rod 6 to install the compression spring 8, which facilitates the installation of the compression spring 8. A limiting rod 21 extends outward from the inner insert rod 6 and is perpendicular to its axis. The limiting rod 21 is located inside the support rod 9. By setting the limiting rod 21, in conjunction with the use of the compression spring 8, it is used to simply limit the inner insert rod 6, preventing the inner insert rod 6 from coming out of the outer cylinder sleeve 5 before use, making it more convenient to use.

[0034] In this embodiment, the axial clamping device 4 includes a steel sleeve 22 fixedly disposed in the insertion hole 7 and a spring steel sheet 23 fixedly disposed at the bottom of the inner side of the steel sleeve 22. The outer wall of the steel sleeve 22 is provided with external threads for detachable fixation in the insertion hole 7. The inner end of the inner insertion rod 6 is fixedly provided with an end head 24, which is slidably disposed in the steel sleeve 22 to prevent the inner insertion rod 6 from being directly inserted into the insertion hole 7 and causing damage to the inner wall of the insertion hole 7.

[0035] In this embodiment, a limiting plate 25 is threadedly connected to the outer cylinder. The limiting plate 25 has mounting holes 26, and is connected to the end face of the precast concrete box 1 through these mounting holes 26. A cable 27 is provided between the steel sleeve 22 and the limiting plate 25. An anchor head 28 is provided on the limiting plate 25 to fix the cable 27 and adjust its tension. A pre-tensioning plate, tapered in shape and evenly distributed circumferentially along the mounting hole 26, is provided inside the mounting hole 26 to enhance the connection strength of the mounting hole 26.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A precast box culvert reinforcement self-positioning device, comprising a precast concrete box body and longitudinal reinforcement embedded in the precast concrete box body, characterized in that: One end of the longitudinal reinforcement is embedded in the precast concrete box, and the other end extends longitudinally from one end face of the precast concrete box. A self-positioning assembly for the reinforcement is provided at the other end of the precast concrete box, corresponding to the longitudinal reinforcement. The self-positioning assembly includes an axial clamping device, an outer cylinder sleeve, and an inner rod. An insertion hole is formed on the end face of the precast concrete box. The axial clamping device is disposed in the insertion hole. The inner end of the inner rod cooperates with the axial clamping device, and the outer end of the inner rod passes through the outer cylinder sleeve. A compression spring is provided between the outer cylinder sleeve and the inner rod. A support rod extends integrally outward from the middle of the inner rod, perpendicular to its axis. An opening groove corresponding to the support rod is formed at the inner end of the outer cylinder sleeve. A first sliding groove is formed on the outer side of the support rod, and a first slider is slidably and sealingly fitted within the first sliding groove. A reinforcement channel is formed at the center of the outer end of the inner rod, and a second sliding groove is formed on the inner wall of the reinforcement channel. The second sliding groove is fitted with a second slider in a sliding seal. The first sliding groove and the second sliding groove are connected by a hydraulic oil channel filled with hydraulic oil. The inner end of the outer cylinder sleeve has a groove corresponding to the support rod. After the support rod is disengaged from the groove, it rotates and the axial clamping device clamps the support rod in the groove, detachably connecting the inner rod to the precast concrete box. The axial clamping device includes a steel sleeve fixedly installed in the insertion hole and a spring steel plate fixedly installed at the bottom of the inner side of the steel sleeve. The outer wall of the steel sleeve has an external thread. The inner end of the inner rod has a fixed end head, which is slidably installed in the steel sleeve. The outer cylinder sleeve is threadedly connected to a limiting plate with an installation hole. The limiting plate is connected to the end face of the precast concrete box through the installation hole. A cable is provided between the steel sleeve and the limiting plate, and an anchor head is provided on the limiting plate for fixing the cable.

2. The precast box culvert reinforcement self-positioning device according to claim 1, characterized in that: A first spring is provided in the first sliding groove, and the first slider is connected to the bottom of the first sliding groove through the first spring; a second spring is provided in the second sliding groove, and the second slider is connected to the bottom of the second sliding groove through the second spring.

3. The precast box culvert reinforcement self-positioning device according to claim 1, characterized in that: At least two sets of the second slider are arranged along the axial direction of the rebar channel. The second slider has a right-angled trapezoidal structure, with the inclined surface of the second slider facing the side where the rebar channel is located, and the larger end of the second slider facing the inner end of the rebar channel.

4. The precast box culvert reinforcement self-positioning device according to claim 1, characterized in that: The compression spring is sleeved on the outside of the inner insert rod, and a step is formed on the outside of the inner insert rod to cooperate with the compression spring. A space is formed between the outer cylinder sleeve and the inner insert rod for installing the compression spring.

5. The precast box culvert reinforcement self-positioning device according to claim 1, characterized in that: The inner rod extends outward to a limiting rod perpendicular to its axis, and the limiting rod is located inside the support rod.

6. The installation method of the precast box culvert steel reinforcement self-positioning device, characterized in that: Using the precast box culvert reinforcement self-positioning device as described in any one of claims 1-5, a precast concrete box body is precast in the factory, and longitudinal reinforcement and reinforcement self-positioning components are respectively set at both ends of the precast concrete box body. After the precast concrete box body is hoisted, it is assembled longitudinally. When the longitudinal reinforcement is inserted into the reinforcement channel, the longitudinal reinforcement can drive the inner insertion rod to move axially. During the continuous displacement process, the support rod is dislodged from the opening slot. After being dislodged, it is rotated 90° and then pressed against the slot, so that the inner insertion rod is detachably connected to the precast concrete box body.

7. The installation method of the precast box culvert reinforcement self-positioning device according to claim 6, characterized in that: The support rod is pressed against the slot by an axial clamping device.

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