A concrete pouring floor slab thickness measuring device

Abstract

A concrete cast floor thickness measuring device includes a measuring rod, a floating plate and a driving rod. The outer side of the measuring rod is provided with a measuring scale. The middle part of the floating plate has a sleeve groove matching the size of the measuring rod. A coaxial slot is arranged inside the measuring rod. The floating plate is sleeved on the outer side of the measuring rod through the sleeve groove. A limit device is provided between the floating plate and the measuring rod to prevent the floating plate from rotating circumferentially after being sleeved on the measuring rod. A first magnet is embedded on the inner wall of one side of the sleeve groove of the floating plate. The driving rod is inserted into the slot of the measuring rod. A second magnet matching the first magnet is embedded on the outer side of the lower end of the driving rod. The second magnet is also only arranged on one side of the driving rod. The outer magnetic pole of the second magnet is different from the inner magnetic pole of the first magnet. On the one hand, this device ensures that the scale accurately reflects the cast height of the floor slab. On the other hand, it is convenient for subsequent readings and improves the measurement accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of detection devices for building construction, and particularly relates to a concrete pouring floor slab thickness measuring device. Background Art

[0002] During the pouring process of reinforced concrete floor slabs, the thickness of the floor slabs needs to be measured before the concrete begins to set, so as to check the areas where the thickness of the floor slabs exceeds the allowable deviation range specified in the specifications and make adjustments to them, so as to control the thickness of the entire floor slab to be within the allowable deviation range.

[0003] As attached Figure 11 As shown, this is a commonly used measuring device in the prior art, which consists of a measuring rod 1 and a floating plate 2. The measuring rod 1 has a measuring scale 11 on the side. When measuring, the measuring rod 1 is inserted into the concrete until the lower end abuts against the formwork, and then the floating plate 2 is inserted into the measuring rod 1 from the upper end of the measuring rod 1. Let it fall on the concrete under the action of gravity. The floating plate 2 will float on the concrete surface due to the buoyancy. At this time, the thickness of the floor slab can be read through the corresponding scale on the upper end of the floating plate 2.

[0004] Since there may be some small debris on the concrete surface, these small debris protrude to the upper surface of the concrete layer, causing the surface to be uneven. Therefore, when the lower surface of the floating plate 2 contacts the upper surface of the concrete, the lower surface of the floating plate 2 will be blocked by the small debris, resulting in the floating plate 2 and the concrete surface not being able to completely fit together, which will cause the measured thickness to be greater than the actual thickness. Therefore, there is an urgent need for a concrete cast floor thickness measuring device that can solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a concrete slab thickness measuring device to solve the problems existing in the background technology.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0007] A concrete cast floor slab thickness measuring device includes a measuring rod, a floating plate and a driving rod. The outer side surface of the measuring rod is provided with a measuring scale, the middle part of the floating plate is provided with a sleeve groove matching the size of the measuring rod, and a coaxially arranged slot is provided in the measuring rod. The floating plate is sleeved on the outer side of the measuring rod through the sleeve groove, and a limit device is provided between the floating plate and the measuring rod to prevent the floating plate from circumferential rotation after being sleeved on the measuring rod. The floating plate is embedded with a first magnet on the inner wall of one side of the sleeve groove; the driving rod is inserted into the slot of the measuring rod, and a second magnet matching the first magnet is embedded on the outer side of the lower end of the driving rod. The second magnet is also only provided on one side of the driving rod, and the outer magnetic pole of the second magnet is different from the inner magnetic pole of the first magnet.

[0008] In this embodiment, the measuring rod includes a first rod body, which is cylindrical in structure. A slot is defined axially within the first rod body, matching the size of the driving rod. The slot is cylindrical and concentric with the first rod body, and the driving rod is cylindrical and matches the slot. This shape ensures that the driving rod remains relatively concentric with the slot after insertion, allowing for relatively smooth rotation.

[0009] In this embodiment, the limiting device includes a limiting groove within the floating plate sleeve groove and a first limiting member of a size matching the limiting groove. The first limiting member is fixed to the outside of the first rod body and its length is parallel to the axis of the first rod body. The sleeve groove includes a cylindrical groove and a limiting groove. The limiting groove communicates with the cylindrical groove. The cylindrical groove is used to accommodate the first rod body, and the limiting groove is used to accommodate the first limiting member. When the floating plate is sleeved onto the measuring rod through the sleeve groove, the first limiting member is positioned within the limiting groove, thereby limiting the circumferential rotation of the floating plate relative to the measuring rod.

[0010] In this embodiment, a spike is fixed to the bottom of the measuring rod for easy insertion into concrete. When the measuring rod is inserted into the concrete, the tip of the spike can smoothly separate the concrete, so that the measuring rod can be smoothly inserted into the concrete.

[0011] This embodiment further includes a locking device for locking the floating plate position, the locking device including an elastic locking tongue, a through slot arranged along the axial direction on the side of the first rod body away from the first limiting member, the through slot connecting the slot with the outside, the driving rod is a hollow rod, and a radial slot arranged along the axial direction is opened on the outer side of the driving rod, the radial slot is connected to the inner cavity of the driving rod, the through slot and the radial slot are matched with the size of the elastic locking tongue, the second magnet on the driving rod is fixed on the side away from the radial slot, and the first magnet is embedded in the inner wall of the cylindrical groove away from the limiting groove;

[0012] An elastic locking tongue is slidably connected in the radial sliding groove, and the elastic locking tongue moves radially along the driving rod in the radial sliding groove. One end of the elastic locking tongue is connected to the inner wall of the inner cavity of the driving rod through an elastic member. In the locked state, under the elastic force of the elastic member, the elastic locking tongue can pass through the radial sliding groove and extend from the through groove. In the contracted state, the elastic member contracts and the elastic locking tongue is received in the radial sliding groove.

[0013] In this embodiment, a slide is slidably installed in the inner cavity of the drive rod, and the elastic lock tongue is slidably connected to the slide through the slide rod. The elastic member is a coil spring, which is sleeved on the slide rod. One end of the coil spring is fixed on the elastic lock tongue, and the other end is fixed on the slide.

[0014] In this embodiment, the vertical edge at one end of the outer side of the elastic locking tongue is chamfered to form a guide bevel. This guide bevel facilitates the disengagement of the elastic locking tongue from the through slot when the drive rod is rotated. Specifically, to release the floating plate, the drive rod can be twisted to the right relative to the measuring rod. When the guide bevel contacts the vertical edge at the inner right end of the radial slot, the elastic locking tongue, guided by the guide bevel, overcomes the elastic force of the elastic member and forces it inward. This allows the elastic locking tongue to exit the through slot and return to contact with the inner wall of the slot, thus releasing the floating plate and allowing for subsequent measurement.

[0015] In this embodiment, an elastic cover is further provided on the outer side of the first rod to seal the through-slot. This elastic cover seals the through-slot to prevent concrete from flowing into the slot and potentially affecting the measuring device. With this arrangement, when the elastic locking tongue is inserted into the through-slot and abuts the inner wall of the cylindrical groove, it actually pushes the elastic cover into contact with the inner wall of the cylindrical groove. The elastic cover then elastically deforms, protruding outward and abutting the inner wall of the cylindrical groove.

[0016] In this embodiment, the elastic cover is made of rubber. This material has good elasticity, corrosion resistance, and water-insulating properties. Furthermore, the elastic cover can also serve as a friction member to increase the friction coefficient, located between the cylindrical groove and the elastic locking tongue, thereby enhancing the fixing effect of the floating plate.

[0017] In this embodiment, a receiving groove for receiving the elastic cover is formed on the side of the first rod, and the elastic cover is fixed in the receiving groove. This arrangement allows the outer side of the first rod to remain relatively flat so that the floating plate can slide smoothly.

[0018] The above-described structure offers significant advantages over existing technologies. When small debris on the concrete surface lifts the float, the drive rod causes the float to oscillate, sinking the debris into the concrete and maintaining a flat surface. This ensures that the scale corresponding to the upper end of the float accurately reflects the slab's cast height, i.e., its thickness. Furthermore, after the measurement is completed, the float can be fixed to the outside of the drive rod to maintain the measurement state, facilitating subsequent readings. The float can also be raised to the surveyor's eye level for precise readings, thereby improving measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure at point A in the middle;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0022] Figure 4 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0023] Figure 5 It is a structural schematic diagram of the measuring rod of the present invention;

[0024] Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0025] Figure 7 Schematic diagram of the structure of the driving rod of the present invention;

[0026] Figure 8 for Figure 7 A magnified schematic diagram of the structure at D in the middle;

[0027] Figure 9 This is a schematic diagram of the connection between the elastic lock tongue, the slide rod, the elastic member and the slide frame of the present invention;

[0028] Figure 10 It is a structural schematic diagram of the floating plate of the present invention;

[0029] Figure 11 It is a structural diagram of a measuring device in the prior art.

[0030] In the accompanying drawings: 1. Measuring rod; 11. Measuring scale; 12. Slot; 13. First rod body; 131. Through slot; 132. Elastic covering member; 133. Accommodating slot; 14. First limiting member; 15. Spike; 2. Floating plate; 21. Sleeve slot; 211. Cylindrical slot; 212. Limiting slot; 22. First magnet; 3. Driving rod; 31. Second magnet; 32. Radial slide groove; 33. Elastic locking tongue; 331. Guide slope; 332. Slide rod; 34. Elastic member; 35. Slide. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-10As shown, the concrete casting floor thickness measuring device of this embodiment includes a measuring rod 1, a floating plate 2 and a driving rod 3. The outer side surface of the measuring rod 1 is provided with a measuring scale 11, the middle part of the floating plate 2 is provided with a sleeve groove 21 that matches the size of the measuring rod 1, and a coaxially arranged slot 12 is provided in the measuring rod 1. The floating plate 2 is sleeved on the outer side of the measuring rod 1 through the sleeve groove 21, and a limit device is provided between the floating plate 2 and the measuring rod 1 to prevent the floating plate 2 from circumferential rotation after being sleeved on the measuring rod 1. The floating plate 2 is embedded with a first magnet 22 on the inner wall of one side of the sleeve groove 21; the driving rod 3 is inserted into the slot 12 of the measuring rod 1, and a second magnet 31 matching the first magnet 22 is embedded on the outer side of the lower end of the driving rod 3. The second magnet 31 is also only provided on one side of the driving rod 3, and the outer magnetic pole of the second magnet 31 is different from the inner magnetic pole of the first magnet 22.

[0033] During use, the measuring rod 1 is inserted into the concrete until the lower end contacts the formwork, and then the floating plate 2 is inserted into the measuring rod 1 from the upper end of the measuring rod 1 through the sleeve groove 21. After insertion, the floating plate 2 is released and it will fall on the concrete under the action of gravity. In this way, the floating plate 2 will float on the concrete surface due to the buoyancy. At this time, the pouring height of the floor slab, that is, the thickness of the floor slab, can be read through the measuring scale 11 corresponding to the upper end of the floating plate 2.

[0034] During the above measurement process, if there are small debris on the concrete surface that pushes up the floating plate 2, the floating plate 2 will float on the concrete surface under the action of buoyancy. At this time, the driving rod 3 can be inserted into the slot 12 from top to bottom. When inserting, the second magnet 31 and the first magnet 22 should be on the same side. When it drops close to the first magnet 22, the first magnet 22 and the second magnet 31 will produce magnetic adsorption across the measuring rod 1, that is, the floating plate 2 will be tightly attached to the outside of the measuring rod 1. At this time, the driving rod 3 can be lifted and lowered relative to the measuring rod 1 in a cycle, so that the floating plate 2 can be driven to oscillate up and down relative to the measuring rod 1, and the floating plate 2 can be kept in contact with the concrete during the oscillation. When the measuring rod 1 is touched, the concrete will be vibrated together, which can enhance the fluidity of the concrete and make the protruding small debris sink into the concrete, so that the upper surface of the concrete can be kept flat. After the vibration is completed, the driving rod 3 is rotated 180 degrees relative to the measuring rod 1. Since the floating plate 2 cannot rotate circumferentially relative to the measuring rod 1, the second magnet 31 will be away from the first magnet 22 during the rotation of the driving rod 3, that is, the magnetic attraction between the two will dissipate, so that the floating plate 2 will resume its free movement state and can naturally float on the concrete surface. At this time, the scale corresponding to the upper end of the floating plate 2 is a more accurate floor slab casting height, that is, the thickness of the floor slab.

[0035] Furthermore, the measuring rod 1 includes a first rod body 13, which is a cylindrical structure. A slot 12 is axially defined within the first rod body 13 and matches the size of the drive rod 3. The slot 12 is cylindrical and concentric with the first rod body 13, and the drive rod 3 is cylindrical and matches the slot 12. This shape of the drive rod 3 maintains relative concentricity with the slot 12 after insertion, allowing for relatively smooth rotation of the drive rod 3.

[0036] The limiting mechanism includes a first limiting member 14, sized to fit within the limiting groove 212. The first limiting member 14 is secured to the outside of the first rod 13, with its length parallel to the axis of the first rod 13. The sleeve groove 21 includes a cylindrical groove 211 and a limiting groove 212. The cylindrical groove 211 accommodates the first rod 13, while the limiting groove 212 communicates with the cylindrical groove 211 and accommodates the first limiting member 14. When the floating plate 2 is sleeved onto the measuring rod 1 via the sleeve groove 21, the first limiting member 14 resides within the limiting groove 212, limiting circumferential rotation of the floating plate 2 relative to the measuring rod 1.

[0037] like Figure 2 As shown, a spike 15 is fixed at the bottom of the measuring rod 1 for easy insertion into concrete. When the measuring rod 1 is inserted into the concrete, the tip of the lower end of the spike 15 can smoothly separate the concrete, so that the measuring rod 1 can be smoothly inserted into the concrete.

[0038] like Figure 5 、 6 As shown, it also includes a locking device for locking the position of the floating plate 2, the locking device includes an elastic locking tongue 33, and the first rod body 13 is provided with an axially arranged through groove 131 on the side away from the first limit member 14, and the through groove 131 connects the slot 12 with the outside, as shown in FIG. Figure 4 、 8 As shown, the drive rod 3 is a hollow rod, and a radial groove 32 arranged along the axial direction is opened on the outer side of the drive rod 3. The radial groove 32 is connected to the inner cavity of the drive rod 3. The through groove 131 and the radial groove 32 are both matched with the size of the elastic lock tongue 33. The second magnet 31 on the drive rod 3 is fixed on the side away from the radial groove 32. The first magnet 22 is embedded in the inner wall of the cylindrical groove 211 and away from the limiting groove 212.

[0039] An elastic locking tongue 33 is slidably connected in the radial slot 32. The elastic locking tongue 33 moves radially along the driving rod 3 in the radial slot 32. One end of the elastic locking tongue 33 is connected to the inner wall of the inner cavity of the driving rod 3 through an elastic member 34. In the locked state, under the elastic force of the elastic member 34, the elastic locking tongue 33 can pass through the radial slot 32 and extend from the through slot 131. In the retracted state, the elastic member 34 retracts and the elastic locking tongue 33 is stored in the radial slot 32.

[0040] like Figure 9As shown, specifically, a slide 35 is slidably installed in the inner cavity of the driving rod 3, and the elastic lock tongue 33 is slidably connected to the slide 35 through the slide rod 332. The elastic member 34 is a coil spring, and the coil spring is sleeved on the slide rod 332. One end of the coil spring is fixed on the elastic lock tongue 33, and the other end is fixed on the slide 35. The coil spring cooperates with the slide 35 to apply an elastic force to the elastic lock tongue 33 to move outward.

[0041] Based on the above structure, after the driving rod 3 is inserted into the slot 12 of the measuring rod 1, it has two states: a locked state and a contracted state. In the contracted state, the radial slide groove 32 and the through groove 131 do not overlap, and the elastic member 34 is compressed under the extrusion of the inner wall of the slot 12. The elastic locking tongue 33 extends out of the radial slide groove 32 under the push of the elastic member 34 and is slidably connected to the inner wall of the slot 12; in the locked state, the driving rod 3 is rotated so that the radial slide groove 32 overlaps with the through groove 131. The elastic locking tongue 33 will pass through the radial slide groove 32 and extend from the through groove 131 under the elastic force of the elastic member 34, and abut against the inner wall of the cylindrical groove 211 of the floating plate 2, thereby limiting the axial sliding of the floating plate 2.

[0042] When the driving rod 3 is inserted into the slot 12, the elastic locking tongue 33 should be pressed inwardly to overcome the elastic force of the elastic member 34 so that the elastic locking tongue 33 is contracted in the radial sliding groove 32, and then the driving rod 3 is inserted into the slot 12. After the driving rod 3 enters the slot 12, the elastic locking tongue 33 moves outward under the elastic force of the elastic member 34. Since the second magnet 31 and the first magnet 22 need to be aligned when the driving rod 3 drives the floating plate 2 to oscillate, that is, the second magnet 31 needs to be opposite to the first magnet 22, the driving rod 3 is rotated at this time so that the radial sliding groove 32 is back to the through slot 131, that is, the two will not overlap. In this state, the first magnet 22 and the second magnet 31 are on the same side, so that when the driving rod 3 moves axially, the first magnet 22 and the second magnet 31 can attract each other, so that the driving rod 3 drives the floating plate 2 to oscillate.

[0043] After the driving rod 3 drives the floating plate 2 to oscillate, the driving rod 3 is rotated 90 degrees, so that the first magnet 22 is disengaged from the second magnet 31. In this state, the floating plate 2 will be in a free movable state, and the scale corresponding to the floating plate 2 at this time is a more accurate floor slab casting height, that is, the thickness of the floor slab; then, in the state, the driving rod 3 is rotated 90 degrees again, so that the radial slide groove 32 is aligned with the through groove 131. At this time, the elastic lock tongue 33 will pass through the radial slide groove 32 and extend from the through groove 131 under the elastic force of the elastic member 34, and abut against the inner wall of the cylindrical groove 211 of the floating plate 2, thereby limiting the axial sliding of the floating plate 2, that is, fixing the floating plate 2 to the outside of the driving rod 3. In this way, after the measuring rod 1 is taken out of the concrete, the measuring instrument will maintain the measuring state, which makes it convenient to lift the floating plate 2 to the level of the surveyor's sight so that the surveyor can read accurately, thereby improving the measurement accuracy.

[0044] Furthermore, the vertical edge at the outer right end of the elastic locking tongue 33 is chamfered to form a guiding bevel 331. When the drive rod 3 is rotated, the guiding bevel 331 facilitates the disengagement of the elastic locking tongue 33 from the through slot 131. Specifically, when it is necessary to release the floating plate 2, the drive rod 3 can be twisted to rotate it to the right relative to the measuring rod 1. When the guiding bevel 331 abuts the vertical edge at the inner right end of the radial slot 32, the elastic locking tongue 33, guided by the guiding bevel 331, overcomes the elastic force of the elastic member 34 and forces the elastic locking tongue 33 to slide inward. In this way, the elastic locking tongue 33 can exit the through slot 131 and return to abutment with the inner wall of the slot 12. In this way, the floating plate 2 can be released for subsequent measurement.

[0045] Furthermore, the outer side of the first rod 13 is provided with an elastic cover 132 for sealing the through-slot 131. The elastic cover 132 seals the through-slot 131, preventing concrete from flowing into the through-slot 131 and affecting the measuring device. With this arrangement, when the elastic locking tongue 33 is inserted into the through-slot 131 and abuts the inner wall of the cylindrical groove 211, it actually pushes the elastic cover 132 into abutment with the inner wall of the cylindrical groove 211. The elastic cover 132 elastically deforms, bulging outward and abutting the inner wall of the cylindrical groove 211.

[0046] It is worth mentioning that in this embodiment, the elastic cover 132 is made of rubber, which has good elasticity, corrosion resistance, and water-proof properties. Furthermore, the elastic cover 132 also serves as a friction member to increase the friction coefficient, located between the cylindrical groove 211 and the elastic locking tongue 33, thereby enhancing the fixing effect of the floating plate 2.

[0047] Furthermore, a receiving groove 133 for receiving the elastic cover 132 is formed on the side of the first rod 13, and the elastic cover 132 is fixed in the receiving groove 133. This arrangement allows the outer side of the first rod 13 to remain relatively flat, so that the floating plate 2 can slide smoothly.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A concrete pouring floor slab thickness measuring device, characterized in that: The invention comprises a measuring rod, a floating plate and a driving rod, wherein the outer side surface of the measuring rod is provided with a measuring scale, the middle part of the floating plate is provided with a sleeve groove matching the size of the measuring rod, a coaxially arranged slot is provided in the measuring rod, the floating plate is sleeved on the outer side of the measuring rod through the sleeve groove, and a limiting device is provided between the floating plate and the measuring rod to prevent the circumferential rotation of the floating plate after being sleeved on the measuring rod, and a first magnet is embedded on an inner wall of one side of the sleeve groove of the floating plate; the driving rod is inserted into the slot of the measuring rod, and a second magnet matching the first magnet is embedded on the outer side of the lower end of the driving rod, and the second magnet is also only arranged on one side of the driving rod, and the outer magnetic pole of the second magnet is different from the inner magnetic pole of the first magnet; the measuring rod comprises a first rod body, and a slot matching the size of the driving rod is opened axially in the first rod body; the limiting device comprises a limiting slot in the sleeve groove of the floating plate and a first limiting member matching the size of the limiting slot, and the first limiting member is fixed on the outer side of the first rod body and its length direction is parallel to the axis of the first rod body; The locking device is also included for locking the position of the floating plate, the locking device includes an elastic locking tongue, a through groove arranged along the axial direction is opened on the side of the first rod body away from the first limiting member, the through groove connects the slot with the outside, the driving rod is a hollow rod, and a radial sliding groove arranged along the axial direction is opened on the outer side of the driving rod, the radial sliding groove is connected with the inner cavity of the driving rod, the through groove and the radial sliding groove are matched with the size of the elastic locking tongue, the second magnet on the driving rod is fixed on the side away from the radial sliding groove, and the first magnet is embedded in the inner wall of the cylindrical groove and away from the limiting groove; An elastic locking tongue is slidably connected in the radial slide groove, and the elastic locking tongue moves radially along the driving rod in the radial slide groove. One end of the elastic locking tongue is connected to the inner wall of the inner cavity of the driving rod through an elastic member. In the locked state, under the elastic force of the elastic member, the elastic locking tongue can pass through the radial slide groove and extend from the through groove. In the contracted state, the elastic member contracts and the elastic locking tongue is received in the radial slide groove.

2. A concrete slab thickness measuring device according to claim 1, characterized in that: The first rod body is a cylindrical structure, the slot is a cylindrical structure concentrically arranged with the first rod body, and the driving rod is a cylindrical structure matching with the slot.

3. A concrete slab thickness measuring device according to claim 1, characterized in that: The sleeve groove comprises a cylindrical groove and a limiting groove, the limiting groove is communicated with the cylindrical groove, the cylindrical groove is used to accommodate the first rod body, and the limiting groove is used to accommodate the first limiting member.

4. A concrete pouring floor slab thickness measuring device according to claim 1, characterized in that: A spike is fixed at the bottom of the measuring rod for easy insertion into concrete.

5. A concrete slab thickness measuring device according to any one of claims 1 to 4, characterized in that: A slide is slidably installed in the inner cavity of the driving rod, the elastic lock tongue is slidably connected with the slide through the slide rod, the elastic member is a coil spring, the coil spring is sleeved on the slide rod, one end of the coil spring is fixed on the elastic lock tongue, and the other end is fixed on the slide.

6. A concrete pouring floor slab thickness measuring device according to claim 5, characterized in that: The vertical edge of one end of the outer side of the elastic locking tongue is chamfered to form a guiding inclined surface.

7. A concrete slab thickness measuring device according to claim 5, characterized in that: The outer side of the first rod body is also provided with an elastic covering member for sealing the through groove.

8. A concrete slab thickness measuring device according to claim 7, characterized in that: The elastic covering piece is made of rubber material.

9. A concrete pouring floor slab thickness measuring device according to claim 7, characterized in that: A receiving groove for receiving the elastic cover is formed on the side surface of the first rod body, and the elastic cover is fixed in the receiving groove.

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