An adjustable bolt for controlling the thickness of the concrete cover for reinforcing bars in a cap beam.

Abstract

This utility model provides an adjustable bolt for controlling the thickness of the protective layer of reinforcing bars in a cap beam, relating to the field of adjustable bolt technology, including a lead screw. Two nuts are threaded onto the lead screw, and a sleeve is fitted onto the lead screw, with the sleeve positioned between the two nuts. A washer is placed between the nuts and the sleeve. This utility model uses a measuring scale and a first positioning post to weld and fix the outermost reinforcing bar to the middle of the sleeve. When the nut is turned to adjust the position of the reinforcing bar, the sleeve moves synchronously with the measuring scale via the first positioning post. The reading of the millimeter scale line on the lead screw at the end furthest from the end is taken, and this reading is subtracted from the total length of the lead screw to obtain the distance from the outermost reinforcing bar to the horizontal line on the side of the cap beam. This allows for precise positioning strictly according to the designed protective layer thickness. It solves the problem of difficulty in obtaining concrete protective layer spacers that match the thickness of the cap beam's protective layer to accurately control the thickness of the reinforcing bar's protective layer.

Description

Technical Field

[0001] This utility model belongs to the field of adjustable bolt technology, and more specifically, it relates to an adjustable bolt for controlling the thickness of the protective layer of the reinforcing steel in a cap beam. Background Technology

[0002] There are two methods for assembling and binding bridge cap beams. One method is to assemble and bind the cap beam reinforcement on the top of the pier. However, because the reinforcement at the top of the pier affects the position of the cap beam skeleton, the position of the cap beam shifts after the stirrups are fitted onto the skeleton. Moreover, it is difficult to guarantee the flatness and verticality of the reinforcement skeleton on the spot, resulting in local protrusions and depressions, which is not conducive to controlling the thickness of the protective layer. The other method is to assemble the cap beam reinforcement using a platform at the steel processing plant. The advantage is that the skeleton size and reinforcement position can be guaranteed, but it is difficult to transport and hoist it to the site. Furthermore, due to the influence of the reinforcement at the top of the pier, it is difficult for the cap beam to be placed smoothly on the top of the pier, and it is often necessary to cut the main reinforcement and stirrups.

[0003] The thickness of the concrete cover for reinforcing bars is generally controlled by using concrete cover spacers of the designed thickness. However, it is difficult to find concrete cover spacers on the market that match the thickness of the cover of the cap beam, making it impossible to accurately control the thickness of the concrete cover for reinforcing bars. In order to improve the pass rate of the cover thickness, adjustable bolts are used to replace the traditional concrete cover spacers. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an adjustable bolt for controlling the thickness of the concrete cover for the reinforcing bars in a cap beam, thereby solving the problem of difficulty in obtaining concrete cover spacers that match the thickness of the cap beam's concrete cover to accurately control the thickness of the reinforcing bar cover.

[0005] This utility model provides an adjustable bolt for controlling the thickness of the protective layer of reinforcing steel bars in a cap beam, achieved through the following specific technical means:

[0006] An adjustable bolt for controlling the thickness of the protective layer of reinforcing steel bars in a cap beam includes a lead screw; two nuts are threaded onto the lead screw, and a sleeve is fitted onto the lead screw, the sleeve being secured between the two nuts, with a washer placed between the nuts and the sleeve; a through hole is radially formed on one side of the sleeve at its middle portion; the end of the lead screw is conical, and a slide rail cavity is axially formed at the end of the lead screw away from the end, and an axial clearance groove is formed on the side of the lead screw, the clearance groove communicating with the slide rail cavity; a measuring scale is slidably connected within the slide rail cavity of the lead screw, and a positioning blind hole is formed at one end of the measuring scale, into which a first positioning post is inserted, the first positioning post penetrating the clearance groove of the lead screw and protruding outward from the through hole of the sleeve.

[0007] Furthermore, the measuring scale is marked with millimeter graduations starting from the end where the lead screw is inserted.

[0008] Furthermore, a magnet is attached to one end of the first positioning post at the positioning blind hole into which the measuring scale is inserted, using strong adhesive.

[0009] Furthermore, a positioning through hole is provided on the measuring scale near the middle part, and a second positioning post is inserted through the positioning through hole. The second positioning post is locked on the upper end of the lead screw away from the end.

[0010] Furthermore, a hexagonal positioning boss is provided on the lead screw near the end; a U-shaped positioning sleeve is fitted on the lead screw, and the positioning sleeve is locked between the positioning boss and a nut.

[0011] Furthermore, a fixing sleeve is fitted onto the end of the lead screw, and the fixing sleeve is locked onto the positioning boss to form a fixed connection. The end face of the fixing sleeve is flush with the cone tip of the end of the lead screw, and a thin layer of waterproof paper is adhered to the end face of the fixing sleeve.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model uses a measuring scale and a first positioning post to weld and fix the outermost reinforcing bar to the middle of the sleeve. When the position of the reinforcing bar is adjusted by turning the nut, the sleeve drives the measuring scale to move synchronously through the first positioning post. The reading of the millimeter scale line of the measuring scale at the end away from the end of the screw is read. Then, the reading is subtracted from the total length of the screw, which is the distance from the outermost reinforcing bar to the horizontal line on the side of the cap beam. This allows for precise positioning according to the designed protective layer thickness.

[0014] 2. This utility model uses a fixed sleeve to fit onto the end of the lead screw, and a waterproof paper is adhered to the end face of the fixed sleeve to form a sealed structure, preventing rainwater from entering the concrete along the lead screw; the thickness of the waterproof paper is extremely small, and the error caused by it to the positioning can be ignored. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the lead screw of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the measuring ruler of this utility model.

[0018] Figure 4 This is a cross-sectional view of the present invention.

[0019] Figure 5 This utility model is in Figure 4 A magnified view of a portion of point A in the middle.

[0020] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0021] 1. Lead screw; 11. End; 12. Slide rail inner cavity; 13. Clearance groove; 14. Positioning boss; 2. Nut; 3. Sleeve; 31. Through hole; 4. Washer; 5. Measuring ruler; 51. Positioning blind hole; 52. Millimeter scale line; 53. Positioning through hole; 6. First positioning post; 7. Magnet block; 8. Second positioning post; 9. Positioning sleeve; 10. Fixing sleeve; 101. Waterproof paper. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] Example:

[0024] As attached Figure 1 To be continued Figure 5 As shown:

[0025] This utility model provides an adjustable bolt for controlling the thickness of the protective layer of the reinforcing steel in a cap beam, including a lead screw 1; two nuts 2 are threaded onto the lead screw 1, and a sleeve 3 is fitted onto the lead screw 1, the sleeve 3 being secured between the two nuts 2, and a washer 4 being placed between the nuts 2 and the sleeve 3; a through hole 31 is radially formed on one side of the sleeve 3 at the middle part; the end 11 of the lead screw 1 is conical, and a slide cavity 12 is axially formed at the end of the lead screw 1 away from the end 11, and an axial clearance groove 13 is formed on the side of the lead screw 1, the clearance groove 13 being connected to the slide cavity 12; a measuring scale 5 is slidably connected in the slide cavity 12 of the lead screw 1, and a positioning blind hole 51 is formed at one end of the measuring scale 5, into which a first positioning post 6 is inserted, the first positioning post 6 penetrating the clearance groove 13 of the lead screw 1 and protruding outward from the through hole 31 of the sleeve 3.

[0026] Among them, such as Figure 3 As shown, the measuring scale 5 is marked with millimeter graduations 52 starting from the end of the lead screw 1; the length of the lead screw 1 is a fixed value; the reinforcing bar is welded and fixed in the middle of the sleeve 3. The position of the sleeve 3 is adjusted by tightening the nut 2 on one side of the lead screw 1. During this process, the first positioning post 6 inserted in the sleeve 3 will drive the measuring scale 5 to slide in the inner cavity 12 of the slide of the lead screw 1. The reading of the millimeter graduations 52 on the measuring scale 5 at the end of the lead screw 1 away from the end 11 is read. Subtracting this reading from the length of the lead screw 1 gives the distance between the outer reinforcing bar and the through line. This distance is adjusted to the required thickness of the reinforcing bar protective layer.

[0027] Among them, such as Figure 5As shown, a magnet 7 is attached to one end of the first positioning post 6 at the positioning blind hole 51 into which the measuring scale 5 is inserted, by means of strong adhesive. The magnet 7 is used to strengthen the connection of the first positioning post 6 in the positioning blind hole 51 of the measuring scale 5, so as to prevent the first positioning post 6 from falling out of the positioning blind hole 51 during the positioning process.

[0028] Among them, such as Figure 3 As shown, a positioning through hole 53 is provided on the measuring ruler 5 near the middle part, such as Figure 1 As shown, a second positioning pin 8 is inserted through the positioning through hole 53, and the second positioning pin 8 is locked on the end of the lead screw 1 away from the end 11; a hexagonal positioning boss 14 is provided on the lead screw 1 near the end 11; a U-shaped positioning sleeve 9 is fitted on the lead screw 1, and the positioning sleeve 9 is locked between the positioning boss 14 and a nut 2; before positioning the adjustable bolt, the bolt needs to be assembled first, the second positioning pin 8 is inserted into the positioning through hole 53 of the measuring ruler 5, and the measuring ruler 5 is inserted into the slide cavity 12 of the lead screw 1 in the appropriate direction until the second positioning pin 8 is locked on the end of the lead screw 1 away from the end 11; then the positioning pin 8 is fitted on the lead screw 1. Tighten the two sets of nuts 2 towards the end 11 of the lead screw 1, and move the sleeve 3 until the positioning sleeve 9 is locked between the positioning boss 14 and a nut 3. Then loosen the other nut 2 and rotate the adjusting sleeve 3 so that its insertion hole 31 is aligned with the clearance groove 13 of the lead screw 1. At this time, the insertion hole 31 of the sleeve 3 is also aligned with the positioning blind hole 51 of the measuring scale 5. Insert the first positioning pin 6 into the insertion hole 31 so that the first positioning pin 6 can be inserted into the positioning blind hole 51 of the measuring scale 5. After that, the positioning sleeve 9 needs to be removed from the lead screw 1, the second positioning pin 8 is pulled out from the positioning through hole 53 of the measuring scale 5, and the nut 2 is tightened again and locked to the end of the sleeve 3.

[0029] Among them, such as Figure 4 As shown, a fixing sleeve 10 is fitted onto the end 11 of the lead screw 1. The fixing sleeve 10 is engaged with the positioning boss 14 to form a fixed connection. The end face of the fixing sleeve 10 is flush with the cone tip of the end 11 of the lead screw 1. A thin layer of waterproof paper 101 is adhered to the end face of the fixing sleeve 10. By fitting the fixing sleeve 10 onto the end 11 of the lead screw 1 and adhering the waterproof paper 101 to the end face of the fixing sleeve 10, a sealing structure is formed to prevent rainwater from entering the concrete along the lead screw 1. The thickness of the waterproof paper 101 is extremely small, and the error caused by it to the positioning is negligible. The pressure area on the waterproof paper 101 is increased by the end face of the fixing sleeve 10, which prevents the waterproof paper 101 from being punctured.

[0030] The specific usage and function of this embodiment are as follows:

[0031] In this invention, before positioning the adjustable bolt, the bolt needs to be assembled first. A second positioning pin 8 is inserted into the positioning through hole 53 of the measuring scale 5. The measuring scale 5 is then inserted into the slide cavity 12 of the lead screw 1 in a suitable direction until the second positioning pin 8 is locked on the end of the lead screw 1 away from the end 11. Then, a positioning sleeve 9 is fitted onto the lead screw 1, and two sets of nuts 2 are turned towards the end 11 of the lead screw 1, moving the sleeve 3 until the positioning sleeve 9 is locked between the positioning boss 14 and a nut 3. Then, the other nut 2 is loosened, and the adjusting sleeve 3 is rotated so that its insertion hole 31 aligns with the clearance groove 13 of the lead screw 1. At this time, the insertion hole 31 of the sleeve 3 also aligns with the positioning blind hole 51 of the measuring scale 5. The first positioning pin is then inserted into the insertion hole 31. First positioning post 6 can be inserted into the positioning blind hole 51 of the measuring scale 5; then the positioning sleeve 9 needs to be removed from the lead screw 1, the second positioning post 8 needs to be pulled out from the positioning through hole 53 of the measuring scale 5, and the nut 2 needs to be tightened again and locked into the end of the sleeve 3; the length of the lead screw 1 is a certain value; the reinforcing bar is welded and fixed in the middle of the sleeve 3, and the position of the sleeve 3 is adjusted by tightening the nut 2 on one side of the lead screw 1. During this process, the first positioning post 6 inserted on the sleeve 3 will drive the measuring scale 5 to slide in the slide cavity 12 of the lead screw 1. Read the reading of the millimeter scale line 52 on the measuring scale 5 at the end of the lead screw 1 away from the end 11. Subtract this reading from the length of the lead screw 1 to get the distance between the outer reinforcing bar and the through line. Adjust this distance to the required thickness of the reinforcing bar protective layer.

[0032] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

Claims

1. An adjustable bolt for controlling the thickness of the protective layer of reinforcing steel bars in a cap beam, comprising a lead screw (1); two nuts (2) are threaded onto the lead screw (1), a sleeve (3) is fitted onto the lead screw (1), the sleeve (3) is secured between the two nuts (2), and a washer (4) is placed between the nuts (2) and the sleeve (3); characterized in that: The sleeve (3) has a through hole (31) radially opened in the middle part on one side; the end (11) of the lead screw (1) is conical, and the lead screw (1) has a slide cavity (12) axially opened at the end away from the end (11), and a clearance groove (13) is opened axially on the side of the lead screw (1), and the clearance groove (13) is connected to the slide cavity (12); a measuring scale (5) is slidably connected in the slide cavity (12) of the lead screw (1), and a positioning blind hole (51) is opened at one end of the measuring scale (5), and a first positioning post (6) is inserted in the positioning blind hole (51), the first positioning post (6) passes through the clearance groove (13) of the lead screw (1) and is exposed outward from the through hole (31) of the sleeve (3); The measuring scale (5) is marked with millimeter graduations (52) starting from one end of the lead screw (1). A magnet (7) is attached to one end of the positioning blind hole (51) of the first positioning post (6) through strong adhesive.

2. The adjustable bolt for controlling the cover layer thickness of the cap beam reinforcement according to claim 1, wherein: The measuring scale (5) has a positioning through hole (53) near the middle part. A second positioning post (8) is inserted through the positioning through hole (53). The second positioning post (8) is locked on the upper end of the lead screw (1) away from the end (11).

3. The adjustable bolt for controlling the cover layer thickness of the cap beam reinforcement according to claim 1, wherein: A hexagonal positioning boss (14) is provided on the lead screw (1) near the end (11); a U-shaped positioning sleeve (9) is fitted on the lead screw (1), and the positioning sleeve (9) is locked between the positioning boss (14) and a nut (2).

4. The adjustable bolt for controlling the cover beam reinforcement layer thickness according to claim 1, wherein: The end (11) of the lead screw (1) is fitted with a fixing sleeve (10), which is fixedly connected to the positioning boss (14). The end face of the fixing sleeve (10) is flush with the cone tip of the end (11) of the lead screw (1), and a thin layer of waterproof paper (101) is adhered to the end face of the fixing sleeve (10).

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