A mold for forming concrete shrinkage test piece

Abstract

The utility model provides a mold for forming concrete shrinkage specimens, including a bottom plate, a front side plate, a rear side plate, a left side plate, a right side plate, a left clamping plate, a right clamping plate, a fastening threaded rod, a threaded rod fixing plate, and a matching probe and end plate; the left clamping plate and the threaded rod fixing plate are respectively fixed to the left edge and the right edge of the upper surface of the bottom plate in the center; the front side plate and the rear side plate are clamped and fixed to the top of the bottom plate by the right clamping plate through the fastening threaded rod tightened and the left clamping plate; the left side plate and the right side plate are limitedly clamped by the front side plate and the rear side plate; the left side plate and the right side plate are provided with a circular mounting hole in the center, and the center of the circular mounting hole coincides with the axis of the specimen. The mold can effectively fix the probe and the end plate during the forming process of the concrete shrinkage specimen, improve the standardization of the specimen forming, and ensure the accuracy of the test results; at the same time, the mold can be quickly disassembled and assembled to improve the operation efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete testing, in particular to a mould for forming a concrete shrinkage test piece. Background Art

[0002] The volume shrinkage of concrete due to the evaporation of water in the air is called shrinkage. Shrinkage is an inevitable harmful volume deformation of cement-based concrete structures during service and one of the main causes of cracking in concrete structures. Under load, cracks in cracked concrete structures will further expand, resulting in reduced bearing capacity and durability of concrete. Therefore, conducting experimental research on concrete shrinkage performance is of great significance for controlling and reducing shrinkage cracks in concrete structures in engineering.

[0003] According to the requirements of current national standards and industry standards, concrete shrinkage tests usually require pre-embedded metal probes or metal end plates at both ends of the specimen. Before the specimen is formed, the probe length or end plate thickness must be accurately measured to determine the effective length of the specimen. Existing concrete shrinkage molds generally use the friction between the probe and the limit hole to fix the probe, and use the friction between the end plate and the side plate of the test mold to fix the end plate. During the vibration molding process of the specimen, the probe or end plate is often misaligned or even falls off due to insufficient friction between the probe or end plate and the test mold, resulting in irregular molding of the specimen, affecting the precision and accuracy of the test. At the same time, traditional concrete shrinkage test molds are usually assembled by fixing four side plates and a bottom plate with six nuts. The disassembly and assembly of the test mold is cumbersome and affects work efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a mold for forming concrete shrinkage specimens in view of the above-mentioned problems. The mold can effectively fix the probe and the end plate during the concrete shrinkage specimen forming process, thereby improving the standardization of the specimen forming; at the same time, the mold can be quickly disassembled and assembled, thereby improving work efficiency.

[0005] In order to realize the above-mentioned technical features, the purpose of the utility model is achieved as follows: A mold for forming concrete shrinkage specimens, comprising a bottom plate, a front side plate, a rear side plate, a left side plate, a right side plate, a left clamping plate, a right clamping plate, a fastening threaded rod, a threaded rod fixing plate and matching measuring heads and end plates; the left clamping plate and the threaded rod fixing plate are respectively fixed centrally on the left edge and the right edge of the upper surface of the bottom plate; the front side plate and the rear side plate are fixed to the top of the bottom plate by the right clamping plate through the fastening threaded rod that is tightened and the left clamping plate; the left side plate and the right side plate are limitedly clamped by the front side plate and the rear side plate; circular mounting holes are provided in the centers of the left side plate and the right side plate, and the centers of the circular mounting holes coincide with the axis of the specimen.

[0006] The left side plate and the right side plate are trapezoidal in shape and narrow at the top and wide at the bottom. The front side plate and the rear side plate are provided with oblique limiting installation grooves matching the left side plate and the right side plate.

[0007] The left side plate and the right side plate are both composed of an upper trapezoidal side plate and a lower trapezoidal side plate, the upper trapezoidal side plate and the lower trapezoidal side plate have the same height; the center of the circular mounting hole is located at the midpoint of the joint between the upper trapezoidal side plate and the lower trapezoidal side plate.

[0008] The circular mounting hole is provided with an annular protrusion near the inner edge of the test mold; the probe is provided with an annular groove matching the annular protrusion; the center of the end plate is provided with a screw hole with a diameter not greater than the inner diameter of the annular protrusion, and the end plate is fixed to the left plate or the right plate by an end plate fixing screw matching the screw hole.

[0009] The front side plate and the rear side plate are both provided with rectangular protrusions near the lower edge on the left and right sides; the right side of the left clamping plate and the left side of the right clamping plate are respectively provided with L-shaped limiting installation grooves matching the left and right sides of the front side plate and the rear side plate.

[0010] The right side of the right clamping plate is an inclined surface inclined to the left; the axis of the fastening threaded rod is perpendicular to the right side inclined surface of the right clamping plate, and the threaded rod fixing plate is provided with an oblique threaded hole matching the fastening threaded rod.

[0011] The right end of the fastening threaded rod is provided with a threaded rod rotating handle.

[0012] A handle is arranged on the left side of the bottom plate.

[0013] The left clamping plate and the threaded rod fixing plate are respectively fixedly connected to the bottom plate through bottom plate screws.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model provides circular mounting holes at the center of the left and right plates, and an annular protrusion at the inner edge of the mounting hole near the test mold. At the same time, an annular groove matching the annular protrusion is provided at the corresponding position of the probe, or the probe or end plate is fixed by using the end plate fixing screw and the screw hole in the center of the end plate to clamp the annular protrusion, which effectively solves the problem that the probe and the end plate are easily misplaced and fall off during the vibration molding process of the concrete shrinkage specimen.

[0016] 2. The left side plate and the right side plate of the utility model are both made of two upper trapezoidal side plates and lower trapezoidal side plates of equal height. The center of the circular mounting hole is located at the midpoint of the joint, which can effectively avoid the collision of the probe and the end plate during the demolding process and improve the stability of the probe and the end plate.

[0017] 3. The utility model adopts trapezoidal left and right panels, and sets matching oblique limit installation grooves on the front and rear side panels. When the front and rear side panels clamp the left and right clamping plates, an oblique downward force is applied to the left and right side panels, which can effectively prevent leakage caused by misalignment of the joints and bottom of the upper trapezoidal side panels and the lower trapezoidal side panels during the specimen forming process, thereby improving the standardization of concrete specimen forming.

[0018] 4. The utility model uses a tightening threaded rod to apply an oblique downward force to the right clamping plate, so that the right clamping plate cooperates with the left clamping plate fixed to the bottom plate to clamp the front side plate and the rear side plate, effectively fixing the front side plate and the rear side plate to the bottom plate, and the test mold can be disassembled and assembled only by loosening or tightening a threaded rod, which greatly improves the efficiency of the test mold disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0021] Figure 2 It is a schematic diagram of the left (right) side plate structure of the utility model.

[0022] Figure 3 It is a structural schematic diagram of the upper trapezoidal side plate of the utility model.

[0023] Figure 4 It is a schematic diagram of the structure of the lower trapezoidal side plate of the utility model.

[0024] Figure 5 It is a schematic diagram of the front (rear) side plate structure of the utility model.

[0025] Figure 6 It is a schematic diagram of the right splint structure of the utility model.

[0026] Figure 7 It is a schematic diagram of splicing a bottom plate, a left clamping plate and a threaded rod fixing plate of the utility model.

[0027] Figure 8 It is a schematic diagram of the probe structure of the utility model.

[0028] Fig. 9 It is a schematic diagram of the end plate structure of the utility model.

[0029] In the figure: 1. bottom plate; 2. front side plate; 3. rear side plate; 4. left side plate; 5. right side plate; 6. left clamping plate; 7. right clamping plate; 8. fastening threaded rod; 9. threaded rod fixing plate; 10. threaded rod rotating handle; 11. circular mounting hole; 12. annular protrusion; 13. upper trapezoidal side plate; 14. lower trapezoidal side plate; 15. oblique limit mounting groove; 16. rectangular protrusion; 17. L-shaped limit mounting groove; 18. handle; 19. probe; 20. annular groove; 21. end plate fixing screw; 22. bottom plate screw; 23. screw; 24. end plate anchor nail. DETAILED DESCRIPTION

[0030] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0031] See also Figure 1-9 A concrete shrinkage test mold includes a bottom plate 1, a front side plate 2, a rear side plate 3, a left side plate 4, a right side plate 5, a left clamping plate 6, a right clamping plate 7, a fastening threaded rod 8, a threaded rod fixing plate 9, and a matching probe 19 and an end plate 21. The left clamping plate 6 and the threaded rod fixing plate 9 are respectively fixed to the left edge and the right edge of the upper surface of the bottom plate 1. The right clamping plate 7 is fastened to the left clamping plate 6 by tightening the fastening threaded rod 8 to clamp the front side plate 2 and the rear side plate 3 to the bottom plate 1. The left side plate 4 and the right side plate 5 are limitedly clamped by the front side plate 2 and the rear side plate 3. The center of the left side plate 4 and the right side plate 5 is provided with a circular mounting hole 11, and the center of the circular mounting hole 11 coincides with the axis of the specimen. The mold can effectively fix the probe and the end plate during the concrete shrinkage specimen molding process, and improve the standardization of the specimen molding; at the same time, the mold can be quickly disassembled and assembled, and the work efficiency is improved.

[0032] Furthermore, the left side plate 4 and the right side plate 5 are trapezoidal in shape and narrow at the top and wide at the bottom. The front side plate 2 and the rear side plate 3 are provided with oblique limiting mounting grooves 15 matching the left side plate 4 and the right side plate 5 at corresponding positions. When the front side plate 2 and the rear side plate 3 limit and clamp the left side plate 4 and the right side plate 5, an oblique downward force is applied to the left side plate 4 and the right side plate 5, which can effectively prevent the left side plate 4 and the right side plate 5 from sliding up and down during the specimen forming process and causing gaps in the test mold.

[0033] Furthermore, the left side plate 4 and the right side plate 5 are both formed by splicing an upper trapezoidal side plate 13 and a lower trapezoidal side plate 14 of equal height, the center of the circular mounting hole 11 is located at the midpoint of the joint between the upper trapezoidal side plate 13 and the lower trapezoidal side plate 14, and an annular protrusion 12 is provided near the inner wall of the test mold at the circular mounting hole 11.

[0034] Furthermore, the probe 19 is provided with an annular groove 20 matching the annular protrusion 12 of the circular mounting hole 11; the center of the end plate 21 is provided with a screw hole with a diameter not greater than the inner diameter of the annular protrusion 12, and the end plate 21 is fixed to the left plate 4 or the right plate 5 by an end plate fixing screw 22 matching the screw hole.

[0035] Furthermore, rectangular protrusions 16 are provided on the left and right sides of the front side panel 2 and the rear side panel 3, and L-shaped limit mounting grooves 17 matching the left and right sides of the front side panel 2 and the rear side panel 3 are provided on the right side of the left clamping plate 6 and the left side of the right clamping plate 7 respectively; the right side of the right clamping plate 7 is an inclined surface inclined to the left, and the axis of the fastening threaded rod 8 is perpendicular to the inclined surface on the right side of the right clamping plate 7. The tightened fastening threaded rod 8 can apply an oblique downward force to the right clamping plate 7, so that the right clamping plate 7 cooperates with the left clamping plate 6 fixed to the bottom plate 1 to firmly fix the front side panel 2 and the rear side panel 3 to the bottom plate 1.

[0036] Furthermore, a threaded rod rotating handle 10 is provided at the right end of the fastening threaded rod 8, and a handle 18 is provided on the left side of the base plate 1. The handle 18 cooperates with the threaded rod rotating handle 10 to facilitate the transportation and movement of the test mold.

[0037] Further, the left clamping plate 6 and the threaded rod fixing plate 9 are respectively fixedly connected to the bottom plate 1 by the bottom plate screws 23. The reliability of the fixed installation between the left clamping plate 6 and the threaded rod fixing plate 9 and the bottom plate 1 is ensured by the above-mentioned threaded connection.

[0038] The implementation process of the utility model is:

[0039] First, use the base plate screws 23 to fix the left clamping plate 6 and the threaded rod fixing plate 9 to the base plate 1; install the probe 19 in the semicircular mounting groove of the lower trapezoidal side plate 14, so that the annular groove 20 of the probe 19 is clamped on the annular protrusion 12 of the lower trapezoidal side plate 14, and then connect the upper trapezoidal side plate 13 and the lower trapezoidal side plate 14 together to obtain the left side plate 4 and the right side plate 5; place the front side plate 2 vertically on the upper surface of the test mold base plate 1 and hold it steady with hands, install the left side plate 4 and the right side plate 5 in the oblique limiting mounting groove 15 of the front side plate 2, and then clamp the rear side plate 3 to the left side plate 4 and the right side plate 5; install the assembled four side plates as a whole in the L-shaped limiting mounting groove 17 of the left clamping plate 6, and clamp the right clamping plate 7 to the front side plate 2 and the rear side plate 3, tighten and tighten the threaded rod 8 to make the test mold assembled firmly. After the concrete shrinkage test piece is formed, the fastening threaded rod 8 is loosened, and the right clamping plate 7, the front side plate 2, the rear side plate 3, the upper trapezoidal side plate 13, and the lower trapezoidal side plate 14 can be removed in sequence to complete the demoulding of the test piece.

Claims

1. A mold for forming a concrete shrinkage specimen, characterized in that: The invention comprises a bottom plate (1), a front side plate (2), a rear side plate (3), a left side plate (4), a right side plate (5), a left clamping plate (6), a right clamping plate (7), a fastening threaded rod (8), a threaded rod fixing plate (9) and a matching measuring head (19) and an end plate (21); the left clamping plate (6) and the threaded rod fixing plate (9) are respectively fixed at the center of the left edge and the right edge of the upper surface of the bottom plate (1); the front side plate (2) and the rear side plate (3) are clamped and fixed to the top of the bottom plate (1) by the right clamping plate (7) through the fastening threaded rod (8) that is tightened and the left clamping plate (6); the left side plate (4) and the right side plate (5) are limitedly clamped by the front side plate (2) and the rear side plate (3); the left side plate (4) and the right side plate (5) are centrally provided with a circular mounting hole (11), and the center of the circular mounting hole (11) coincides with the axis of the specimen.

2. A mold for forming a concrete shrinkage specimen according to claim 1, characterized in that: The left side plate (4) and the right side plate (5) are trapezoidal in shape, narrow at the top and wide at the bottom. The front side plate (2) and the rear side plate (3) are provided with oblique limiting installation grooves (15) matching the left side plate (4) and the right side plate (5).

3. A mold for forming a concrete shrinkage specimen according to claim 2, characterized in that: The left side plate (4) and the right side plate (5) are both composed of an upper trapezoidal side plate (13) and a lower trapezoidal side plate (14) spliced ​​together, and the upper trapezoidal side plate (13) and the lower trapezoidal side plate (14) have the same height; the center of the circular mounting hole (11) is located at the midpoint of the joint between the upper trapezoidal side plate (13) and the lower trapezoidal side plate (14).

4. A mold for forming a concrete shrinkage specimen according to claim 3, characterized in that: The circular mounting hole (11) is provided with an annular protrusion (12) near the inner edge of the test mold; the probe (19) is provided with an annular groove (20) matching the annular protrusion (12); a screw hole having a diameter no greater than the inner diameter of the annular protrusion is provided at the center of the end plate (21), and the end plate (21) is fixed to the left plate (4) or the right plate (5) by an end plate fixing screw (22) matching the screw hole.

5. A mold for forming a concrete shrinkage specimen according to claim 2, characterized in that: The front side plate (2) and the rear side plate (3) are provided with rectangular protrusions (16) near the lower edges on both sides; the right side of the left clamping plate (6) and the left side of the right clamping plate (7) are respectively provided with L-shaped limit installation grooves (17) matching the left and right sides of the front side plate (2) and the rear side plate (3).

6. A mold for forming a concrete shrinkage specimen according to claim 1, characterized in that: The right side of the right clamping plate (7) is an inclined surface inclined to the left; the axis of the fastening threaded rod (8) is perpendicular to the right inclined surface of the right clamping plate (7), and the threaded rod fixing plate (9) is provided with an oblique threaded hole matching the fastening threaded rod (8).

7. A mold for forming a concrete shrinkage specimen according to claim 6, characterized in that: The right end of the fastening threaded rod (8) is provided with a threaded rod rotating handle (10).

8. A mold for forming a concrete shrinkage specimen according to claim 6, characterized in that: A handle (18) is provided on the left side of the bottom plate (1).

9. A mold for forming a concrete shrinkage specimen according to claim 6, characterized in that: The left clamping plate (6) and the threaded rod fixing plate (9) are respectively fixedly connected to the bottom plate (1) via bottom plate screws (23).

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