A levelness detection device for highway construction

Abstract

The utility model relates to a levelness detection device for highway construction relates to highway levelness detection device field mainly is to solve the problem of big error of the present detection highway levelness and designs. The support frame includes the upper support beam and lower support beam connected through two connecting rods, and the upper support beam and lower support beam all have rectangular long holes. The top of upper support beam has a drawing board, a measuring rod is slidingly installed in a support sleeve, the upper end of the measuring rod has a fixing ring, a marking pen is installed in the fixing ring, and the top of the fixing ring is provided with a locking bolt. The top of the support sleeve is fixedly provided with a guide rod, the rectangular long hole of the upper support beam has a guide groove, and the guide rod is arranged in the guide groove. The middle of the drawing board is provided with an auxiliary line, the drawing board is provided with a measuring scale, the upper end surface of the drawing board is provided with a sliding groove, the sliding groove has a sliding block, and the sliding block is fixedly installed at the top of the measuring scale. The advantage is high measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of highway levelness testing devices, and in particular to a levelness testing device for highway construction. Background Technology

[0002] During highway construction, the levelness of each compacted pavement layer needs to be tested to assess the construction quality. Current methods for testing pavement levelness mostly involve using a 3-meter straightedge. The straightedge is placed horizontally on the ground, and the gap between the straightedge and the pavement is visually assessed to determine the location of the maximum gap. A wedge gauge is then inserted into the maximum gap to measure it. Alternatively, a depth gauge is used to measure the depth from the top of the gauge to the ground at the location of the maximum gap. Subtracting the straightedge height from this depth gives the maximum gap height at the test point. Multiple measurements can be taken consecutively, and the average value is calculated to determine the pass rate.

[0003] The shortcomings of the above operating method are: because the ruler is relatively low and the gap between the road surface and the ruler is usually small, workers need to bend down and squat down to perform the operation, which not only increases the fatigue of the workers, but also makes it easy to make deviations when visually finding the maximum gap between the ruler and the road surface, resulting in a large error in the final measurement result; therefore, there is an urgent need for a levelness testing instrument for highway construction that is easy to operate, can reduce worker fatigue and improve measurement accuracy. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a levelness testing device for highway construction, which can effectively improve the convenience of operation, reduce the fatigue of workers during the work process, and at the same time improve the measurement accuracy and ensure the accuracy of the measurement results.

[0005] The purpose of this utility model is achieved as follows: it includes a support frame, which includes an upper support beam and a lower support beam arranged in parallel, and the upper support beam and the lower support beam are connected by two connecting rods on the left and right sides; rectangular elongated holes are correspondingly opened in the length direction of the upper support beam and the lower support beam.

[0006] The top rear end of the upper support beam is connected to an upward-extending drawing board.

[0007] It also includes a support sleeve, with the measuring rod slidably installed inside the support sleeve. The upper and lower ends of the measuring rod extend from the upper and lower ends of the support sleeve, respectively. A fixing ring is fixed to the upper end of the measuring rod, and the scribing pen is installed in the fixing ring. A locking bolt is provided at the top of the fixing ring.

[0008] The support sleeve is slidably installed in the support frame, that is, the support sleeve can slide in the rectangular elongated holes of the upper support beam and the lower support beam of the support frame. Guide rods are fixed on the front and rear sides of the top of the support sleeve, and guide grooves are provided on the front and rear side walls of the rectangular elongated hole of the upper support beam. The two guide rods on the support sleeve are respectively placed in the two guide grooves.

[0009] In the initial state, the tip of the drawing pen, i.e. the working end, is in contact with the middle of the drawing board.

[0010] Set auxiliary lines along the length of the drawing board in the middle. When setting auxiliary lines, the tip of the drawing pen is in contact with the auxiliary lines in the initial state.

[0011] A measuring ruler is slidably installed on the drawing board along its height. Specifically, a groove is provided on the upper surface of the drawing board, and a slider is slidably installed in the groove. The slider is fixed to the top of the measuring ruler, which can move along the length of the drawing board.

[0012] The position of the measuring ruler on the measuring ruler corresponding to the auxiliary line is the 0 mark; the scales on the measuring ruler at both ends of the 0 mark are marked from small to large.

[0013] A spirit level can also be installed on the upper surface of the upper support beam of the support frame.

[0014] Rollers can also be installed at the bottom of the measuring rod.

[0015] The heights of the connecting rod and the measuring rod are adjustable. The connecting rod includes a sleeve that connects to the lower support beam. A support rod slides through the sleeve, and the upper end of the support rod is fixedly connected to the upper support beam. A locking bolt is provided on the sleeve. After the height is adjusted, the locking bolt is tightened.

[0016] The measuring rod and connecting rod have similar structures, including an outer sleeve and a rod body that moves through the outer sleeve. The outer sleeve also has locking bolts and countersunk holes. The locking bolts on the outer sleeve, once installed into the countersunk holes, do not protrude from the outer surface of the countersunk holes. When the measuring rod is height-adjustable, the rollers are installed at the lower end of the rod body, and the retaining ring is fixed to the upper end of the outer sleeve.

[0017] The advantages of this invention are: by placing the support frame on the surface to be measured, it avoids the need for workers to bend over and squat to place the ruler, thus reducing worker fatigue during the work process; through the sliding support sleeve, the measuring rod moves synchronously. When the measuring rod moves and there is a depression or protrusion in the ground it contacts, it will move vertically along the support sleeve, and the distance it moves is usually the height of the depression or protrusion. At this time, the marking pen at the top of the measuring rod will display this trajectory on the drawing board, making it easy to clearly observe the vertical movement of the trajectory, thereby judging the data when the gap is large, providing an accurate reference for subsequent calculations, ensuring the accuracy of subsequent measurements. The structure is simple and highly practical. The height of both the connecting rod and the measuring rod is adjustable to meet the needs of workers of different heights. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram showing the connection state of the measuring rod and the support sleeve in this utility model;

[0020] Figure 3 This is a schematic diagram of the connecting rod in this utility model. Detailed Implementation

[0021] The following is combined Figure 1-3 The present invention will be further described below;

[0022] It includes a support frame, which comprises an upper support beam 1 and a lower support beam 2 arranged parallel to each other. The upper and lower support beams are connected by two connecting rods 3 on the left and right sides. Rectangular holes 4 are correspondingly opened along the length of the upper and lower support beams. The bottom of the support frame is flat to ensure the stability of the support frame during testing and to ensure that the bottom of the support frame is in close contact with the flat part of the road surface. A drawing board 5 extending upwards is connected to the top rear end of the upper support beam.

[0023] It also includes a support sleeve 6, a measuring rod 7 that is slidably installed inside the support sleeve, with the upper and lower ends of the measuring rod extending out from the upper and lower ends of the support sleeve respectively, and a fixing ring 8 fixed to the upper end of the measuring rod. A marking pen 9 is installed in the fixing ring, and a locking bolt 10 is provided at the top of the fixing ring. After the marking pen is installed, tightening the locking bolt can fix the marking pen.

[0024] The support sleeve is slidably installed in the support frame, that is, the support sleeve can slide in the rectangular elongated holes of the upper support beam and the lower support beam of the support frame. Guide rods 11 are fixed on the front and rear sides of the top of the support sleeve, and guide grooves 12 are provided on the front and rear side walls of the rectangular elongated hole of the upper support beam, and the two guide rods on the support sleeve are respectively placed in the two guide grooves.

[0025] In the initial state, the tip of the drawing pen, i.e. the working end, is in contact with the middle of the drawing board.

[0026] During the inspection, the support frame is placed on the road surface to be inspected, ensuring its levelness. The bottom of the measuring rod is flush with the bottom of the support frame to improve measurement accuracy. The sliding support sleeve then moves along the length of the support frame, causing the measuring rod to move synchronously. When the measuring rod encounters a road surface depression, it lowers, and a marking pen draws a downward line on the drawing board. As the measuring rod moves out of the depression, the marking pen moves upward. The undulation of the marked path on the drawing board clearly indicates the location of the largest gap between the bottom of the support frame and the road surface. Measuring this path yields the corresponding gap data. The undulating path also facilitates observation of the road surface construction quality, providing a visual reference for the road surface's levelness.

[0027] To facilitate clear observation of the road surface's undulations and to provide a benchmark for subsequent measurements, thereby improving operational convenience, an auxiliary line 14 can be set along the length of the drawing board in the middle. When setting the auxiliary line, the tip of the drawing pen is initially in contact with the auxiliary line.

[0028] To facilitate rapid data reading, a measuring ruler 15 can be slidably installed on the drawing board along its height. Specifically, a groove is provided on the upper surface of the drawing board, and a slider 13 is slidably installed in the groove. The slider is fixed to the top of the measuring ruler, which can move along the length of the drawing board. This allows for rapid measurement after the road surface undulations are drawn with a line marker.

[0029] The position where the measuring ruler corresponds to the auxiliary line is the 0 mark; the scale on the measuring ruler at both ends of the 0 mark is marked from small to large.

[0030] To make it easier to visually determine whether the support frame is placed horizontally, a level bubble 16 can be installed on the upper surface of the upper support beam of the support frame.

[0031] To facilitate the movement of the measuring rod, a roller 17 can be installed at the bottom of the measuring rod. In the initial state, the bottom of the roller is flush with the bottom of the support frame.

[0032] To accommodate workers of different heights, the heights of the connecting rod and the measuring rod are adjustable. The connecting rod 3 includes a sleeve 31 connected to the lower support beam. A support rod 32 slides through the sleeve. The upper end of the support rod is fixedly connected to the upper support beam. A locking bolt is provided on the sleeve. After the height is adjusted, the locking bolt is tightened to ensure the stability of the adjusted connecting rod.

[0033] The height of the measuring rod is adjustable to accommodate the adjustment of the connecting rod, ensuring that the testing work is not affected. The measuring rod 7 has a similar structure to the connecting rod, including an outer sleeve 71 and a rod body 72 that moves through the outer sleeve. The outer sleeve is also equipped with locking bolts, and countersunk holes are formed in the outer sleeve. After the locking bolts on the outer sleeve are installed into the countersunk holes, they do not protrude from the outer surface of the countersunk holes, thus preventing the measuring rod from being obstructed during its up and down movement. When the measuring rod is height-adjustable, the roller 17 is installed at the lower end of the rod body, and the fixing ring 8 is fixed at the upper end of the outer sleeve.

[0034] During actual adjustment, since the support sleeve and the upper support beam are slidably connected through the guide groove and guide rod, the support sleeve and measuring rod will move upward synchronously as the upper support beam moves upward. At this time, the roller at the bottom of the measuring rod will disengage from the ground. After the adjustment is completed, loosen the locking bolt on the outer sleeve of the measuring rod, pull out the rod, make the bottom of the roller contact the ground, and then tighten the locking nut.

[0035] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A levelness testing device for highway construction, comprising a support frame, the support frame including an upper support beam (1) and a lower support beam (2) arranged parallel to each other, the upper support beam and the lower support beam being connected by two connecting rods (3) on the left and right sides; characterized in that: Rectangular elongated holes (4) are opened in the length direction of the upper support beam and the lower support beam respectively; The top rear end of the upper support beam is connected to an upwardly extending drawing board (5); It also includes a support sleeve (6), a measuring rod (7) which is slidably installed in the support sleeve, the upper end and the lower end of the measuring rod extending out from the upper end and the lower end of the support sleeve respectively, a fixing ring (8) fixed at the upper end of the measuring rod, a scribing pen (9) installed in the fixing ring, and a locking bolt (10) provided at the top of the fixing ring. The support sleeve is slidably set in the support frame. Guide rods (11) are fixed on the front and rear sides of the top of the support sleeve. Guide grooves (12) are provided on the front and rear side walls of the rectangular long hole of the upper support beam. The two guide rods on the support sleeve are placed in the two guide grooves respectively. An auxiliary line (14) is set in the middle of the drawing board along its length direction. The end of the drawing pen contacts the auxiliary line. A measuring ruler (15) is slidably installed on the drawing board along the height direction of the drawing board. That is, a groove is provided on the upper surface of the drawing board, and a slider (13) is slidably installed in the groove. The slider is fixed on the top of the measuring ruler.

2. The highway construction levelness testing device according to claim 1, characterized in that: The position where the measuring ruler corresponds to the auxiliary line is the 0 mark; the scale on the measuring ruler at both ends of the 0 mark is marked from small to large.

3. The highway construction levelness testing device according to claim 1, characterized in that: A spirit level (16) is set on the upper surface of the upper support beam of the support frame.

4. The highway construction levelness testing device according to claim 1 or 3, characterized in that: A roller (17) is provided at the bottom of the measuring rod.

5. The highway construction levelness testing device according to claim 1 or 3, characterized in that: The connecting rod (3) includes a sleeve (31) connected to the lower support beam, a support rod (32) is slidably inserted inside the sleeve, the upper end of the support rod is fixedly connected to the upper support beam, and a locking bolt is provided on the sleeve.

6. The highway construction levelness testing device according to claim 1 or 3, characterized in that: The measuring rod (7) includes an outer sleeve (71) and a rod body (72) that is movably inserted inside the outer sleeve. The outer sleeve is provided with a locking bolt and a countersunk hole is opened on the outer sleeve. After the locking bolt on the outer sleeve is installed into the countersunk hole, it does not protrude from the outer surface of the countersunk hole.

Images