Detachable steel test mold

Abstract

The utility model discloses a detachable steel test mold, and belongs to the technical field of concrete molds. According to the detachable steel test mold disclosed by the utility model, the side baffles and the bottom plate can be detached and are connected through the screws in the counterbores, so that the flatness of the bottom can be effectively kept; the hemispherical head lead screw is connected with the occupying block, it can be ensured that the occupying block is located in the center of the first cavity, and in the subsequent concrete pouring process, the thickness of the side wall of the prepared concrete fence is uniform; meanwhile, the occupied block is fixed through the uniformly arranged positioning rods, so that the occupied block is prevented from rotating when the hemispherical head screw rod drives the occupied block to move up and down, and the integrity of the prepared concrete fence is ensured. The detachable steel test mold disclosed by the utility model is small in size, convenient to mount and dismount, and convenient for laboratory workers to use.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete moulds, in particular to a detachable steel test mould. Background Art

[0002] During the construction of concrete projects, due to the diversity of structures and the inconsistency of structural cross-sectional areas, multiple pourings are often required to form the concrete structure required by the design. This creates the problem of the joints between new and old concrete. In order to make the new and old concrete bond well together, the surface where the original concrete contacts the new concrete must be roughened, that is, the smooth surface of the solidified concrete is removed to expose the rough surface. The quality of the rough surface treatment of the concrete directly affects the bonding effect of the new and old concrete.

[0003] Concrete surface retarders are mainly used to obtain rough surfaces. In JC / T 2624-2021 "Concrete Surface Retarders", it is defined as the etching depth, which is the concave-convex depth obtained on the surface of the precast concrete component after the demoulding and water flushing of the action surface of the concrete surface retarder. The standard 6.7 Etching Depth specifies the detection method of concrete surface retarders during product testing: measure the average height difference between the high and low points of the rough surface, and use the height difference of 36 fixed points selected in the rough area of ​​100mm×100mm as the average value as the concave-convex depth of the specimen.

[0004] However, precast concrete components need to be placed in a steaming box for steaming during the production process. Due to the inconsistent thermal expansion coefficients of the materials, if steel plates are used to make enclosures, gaps will be generated between the enclosures and the concrete during the steaming process due to inconsistent expansion, which will make subsequent tests impossible to carry out. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a detachable steel test mold. The side baffles and the bottom plate of the detachable steel test mold of the utility model can be detached. The gantry and the positioning rod can be used to ensure that the placeholder block is located at the center of the first cavity, so as to facilitate the preparation of a concrete enclosure with uniform wall thickness. The placeholder block is then connected to the placeholder block through a hemispherical head screw. After the placeholder block is taken out, concrete can be poured to achieve one-piece molding of the enclosure and the concrete specimen and prevent the generation of gaps. The detachable steel test mold of the utility model has a small size and is easy to install and disassemble.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] The utility model provides a detachable steel test mold, comprising two L-shaped side wall baffles and a bottom plate installed at the bottom of the side wall baffles, the two side wall baffles are clamped together to form a first cavity with the bottom plate, and the first cavity is used to place a placeholder block;

[0008] The steel test mold also includes a gantry and a hemispherical head screw;

[0009] The gantry comprises a crossbeam and columns fixed on both sides of the crossbeam, and the columns are clamped with the outer side walls of the side wall baffles;

[0010] A screw hole is provided at the center of the crossbeam, and the hemispherical screw passes through the screw hole and is connected to the placeholder block;

[0011] Positioning rod holes are evenly arranged around the screw rod hole for installing the positioning rod, and the positioning rod passes through the positioning rod hole and is connected to the placeholder block.

[0012] The ball head of the hemispherical head screw is arranged at the bottom end of the hemispherical head screw, and the hemispherical head screw is provided with a ball head cap matched with the ball head, and the bottom of the ball head cap is connected to the placeholder block.

[0013] Furthermore, the outer side wall of the first cavity is symmetrically provided with a vertical side wall slide groove located on the side wall baffle and a bottom plate slide groove located on the bottom plate; a sliding protrusion is provided on the inner side of the column of the gantry, and the side wall slide groove and the bottom plate slide groove are respectively matched with the sliding protrusion for installing and positioning the gantry;

[0014] Preferably, the top end of the hemispherical screw is connected with a hand wheel;

[0015] The lower end of the side wall baffle is provided with a screw hole, the bottom plate is provided with a countersunk hole, and the side wall baffle is connected to the bottom plate by screws;

[0016] The bottom of the side wall of the gantry is provided with a gantry bolt hole, the side of the bottom plate is provided with a bottom plate bolt hole, and the gantry and the bottom plate are fixedly connected by pins.

[0017] Preferably, the size of the first cavity is 150mm×150mm×150mm, which meets the requirements of JG237-2008 concrete test mold; the size of the placeholder block is 100mm×100mm×100mm.

[0018] The flatness error of the bottom surface of the placeholder block in contact with the steel test mold is no more than 0.04 mm per 100 mm, which meets the requirements of JG237-2008 concrete test mold.

[0019] Furthermore, the placeholder block is a metal block, which can be an alloy block, iron block or other solid block of a certain volume. The placeholder block can be brought into close contact with the bottom of the steel test mold through a hemispherical head screw in the detachable steel test mold, and the volume of the placeholder block can be kept unchanged.

[0020] After the placeholder block is placed on the bottom plate, a second cavity is formed between the side wall baffle, the bottom plate and the placeholder block, which is used to pour concrete to form a concrete enclosure; by rotating the hemispherical head screw, the placeholder block is taken out of the concrete enclosure, and a third cavity is formed between the concrete enclosure and the bottom plate, which is used to pour concrete specimens.

[0021] Because concrete surface retarders are mainly used in the production of prefabricated components, and the production of prefabricated components requires steam curing, the utility model adopts the same steam curing system as the production of prefabricated components for steam curing. However, in the prior art, the thermal expansion coefficients of the enclosure material and the prefabricated components are inconsistent, resulting in a gap between the enclosure and the concrete during the steam curing process, making subsequent tests impossible.

[0022] According to the above principle, the utility model first uses a placeholder block to divide the detachable steel test mold into two parts, a concrete mixture is added to one part to prepare an enclosure, the enclosure is formed by dry curing and the surface is hardened. At this time, brushing a retarder on the surface of the concrete will not have any effect on the enclosure, and then the concrete mixture is poured into the enclosure for steam curing and forming. In the utility model, the same concrete is used for both forming processes, and the deformation of the enclosure and the central concrete is coordinated during the steam curing process, and no cracks will appear.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The side baffles and bottom plate of the detachable steel test mold of the utility model can be disassembled, and the two are connected by screws in the countersunk holes, which can effectively keep the bottom flat; the hemispherical screw and the placeholder block are connected, which can ensure that the placeholder block is located at the center of the first cavity, so that the side wall thickness of the prepared concrete enclosure is uniform during the subsequent concrete pouring process; at the same time, the utility model fixes the placeholder block by evenly arranged positioning rods to prevent the placeholder block from rotating when the hemispherical screw drives the placeholder block to move up and down, thereby ensuring the integrity of the prepared concrete enclosure. The detachable steel test mold of the utility model is small in size, easy to install and disassemble, and convenient for laboratory staff to use.

[0025] The enclosure and concrete specimens made of the same material are prepared through secondary molding, so that the materials and molding of the enclosure and the test specimen are integrated. It is avoided that the enclosure is made by bonding, which makes the enclosure easy to leak and deform. During the steam curing process, cracks will not appear due to the inconsistency of the expansion coefficients of the enclosure and the specimen, which is convenient for the production of actual prefabricated components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of a detachable steel test mold;

[0027] Figure 2 It is a top view of the detachable steel test mold;

[0028] Figure 3 for Figure 2 Sectional view along AA direction;

[0029] Figure 4 The three-dimensional structure of the side wall baffle and the bottom plate combined Figure 1 ;

[0030] Figure 5 The three-dimensional structure of the side wall baffle and the bottom plate combined Figure 2 ;

[0031] Figure 6 The three-dimensional side wall baffle Figure 1 ;

[0032] Figure 7 The three-dimensional side wall baffle Figure 2 ;

[0033] Figure 8 is a top view of the side wall baffle;

[0034] Fig. 9 is a three-dimensional image of the base plate;

[0035] Fig.10 This is a three-dimensional diagram of the gantry;

[0036] Fig.11 A top view of the tooling for preparing concrete for adding to the concrete enclosure;

[0037] Fig.12 for Fig.11 Cross-sectional view along the BB direction;

[0038] Fig.13 A three-dimensional diagram of the third cavity formed by the concrete enclosure and the bottom plate;

[0039] Fig.14 A top view of the third cavity formed by the concrete enclosure and the bottom plate;

[0040] Fig.15 for Fig.14 Sectional view along CC direction;

[0041] Fig.16 It is a three-dimensional picture of the concrete specimen and the side wall baffle;

[0042] Fig.17 It is the top view of the concrete specimen and the side wall baffle;

[0043] Fig.18 for Fig.17 Cross-sectional view along the DD direction;

[0044] Fig.19 It is a three-dimensional picture of the concrete specimen and the concrete enclosure;

[0045] Fig. 20 It is the top view of the concrete specimen and the concrete enclosure;

[0046] Fig.21 for Fig. 20 Sectional view along EE direction;

[0047] Fig. 22 This is a stereoscopic image of the test surface of the concrete specimen after the retarder on the concrete surface was etched.

[0048] In the figure, 1, side wall baffle; 1-1, side wall slide groove; 1-2, protrusion; 1-3, recessed portion; 1-4, screw hole; 2, bottom plate; 2-1, bottom plate slide groove; 2-2, bottom plate bolt hole; 2-3, countersunk hole; 3, screw; 4, gantry; 4-1, screw hole; 4-2, sliding protrusion; 4-3, positioning rod hole; 4-4, gantry bolt hole; 4-5, crossbeam; 4-6 column; 5, pin; 6, hemispherical head screw; 7, ball head cap; 8, placeholder; 9, handwheel; 10, positioning rod; 11, concrete enclosure; 12, concrete surface retarder; 13, concrete specimen; 14, first cavity; 15, second cavity; 16, third cavity. DETAILED DESCRIPTION

[0049] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0050] The utility model provides a detachable steel test mold, such as Figure 1-22 , comprising two L-shaped side wall baffles 1 and a bottom plate 2 installed at the bottom of the side wall baffles 1, the two side wall baffles 1 are snap-fitted to form a first cavity 14 with the bottom plate 2, and the first cavity 14 is used to place a placeholder 8;

[0051] The lower end of the side wall baffle plate 1 is provided with screw holes 1-4, the bottom plate 2 is provided with countersunk holes 2-3, and the side wall baffle plate 1 is connected to the bottom plate 2 by screws 3;

[0052] The detachable steel test mold also includes a gantry 4 and a hemispherical head screw 6;

[0053] The gantry 4 includes a crossbeam 4-5 and columns 4-6 fixed on both sides of the crossbeam 4-5, and the columns 4-6 are clamped with the outer side wall of the side wall baffle 1;

[0054] A screw hole 4-1 is provided at the center of the crossbeam 4-5, and a hemispherical screw 6 passes through the screw hole 4-1 and is connected to the placeholder block 8;

[0055] Four positioning rod holes 4 - 3 are evenly arranged around the screw rod hole 4 - 1 for installing the positioning rod 10 . The positioning rod 10 passes through the positioning rod holes 4 - 3 and is connected to the placeholder block 8 .

[0056] A second cavity 15 is formed between the side wall baffle 1, the bottom plate 2 and the placeholder block 8 for pouring concrete to form a concrete enclosure 11; in the utility model, a third cavity 16 is formed between the concrete enclosure 11 and the bottom plate 2 for pouring concrete to form a concrete specimen 13.

[0057] The side wall baffle 1 and the bottom plate 2 of the detachable steel test mold of the utility model can be disassembled, and the two are connected by screws in the countersunk holes, which can effectively keep the flatness of the bottom; the hemispherical head screw 6 and the placeholder 8 are connected, which can ensure that the placeholder 8 is located at the center of the first cavity 14, so that the side wall thickness of the prepared concrete enclosure 11 is uniform during the subsequent concrete pouring process; at the same time, the utility model fixes the placeholder 8 by evenly arranged positioning rods 10 to prevent the placeholder 8 from rotating when the hemispherical head screw 6 drives the placeholder 8 to move up and down, thereby ensuring the integrity of the prepared concrete enclosure 11.

[0058] Further, the ball head of the hemispherical screw 6 is arranged at the bottom end of the hemispherical screw 6, and the hemispherical screw 6 is provided with a ball head cap 7 matched with the ball head, and the bottom of the ball head cap 7 is connected to a placeholder block 8, which is convenient for fixing the placeholder block 8. Preferably, the placeholder block 8 is an iron block, and the hemispherical screw 6 passes through the ball head cap 7, and the ball head at the bottom end is used to prevent the ball head cap 7 from sliding off, and the ball head cap 7 is welded to the iron block.

[0059] Furthermore, the outer wall of the first cavity 14 is symmetrically provided with a vertical side wall groove 1-1 located on the side wall baffle 1 and a bottom plate groove 2-1 located on the bottom plate 2; a sliding protrusion 4-2 is provided on the inner side of the column 4-6 of the gantry 4, and the side wall groove 1-1 and the bottom plate groove 2-1 are respectively matched with the sliding protrusion 4-2 for installing and positioning the gantry 4, so as to facilitate the disassembly of the gantry 4; preferably, a hand wheel 9 is connected to the top end of the hemispherical head screw 6.

[0060] A gantry bolt hole 4-4 is provided at the bottom of the side wall of the gantry 4, and a bottom plate bolt hole 2-2 is provided on the side of the bottom plate 2. The gantry 4 and the bottom plate 2 are fixedly connected by pins 5, so that the connection between the gantry 4 and the side wall baffle 1 and the bottom plate 2 is more stable. When the hand wheel 9 is rotated, the placeholder 8 can be stably pulled out of the concrete enclosure 11.

[0061] Preferably, the size of the first cavity is 150mm×150mm×150mm, which meets the requirements of JG237-2008 concrete test mold; the size of the placeholder is 100mm×100mm×100mm. The flatness error of the bottom surface of the placeholder in contact with the steel test mold is not greater than 0.04mm per 100mm. The side wall baffle and bottom plate of the utility model are required to meet the requirements of JG237-2008 concrete test mold.

[0062] In the specific use process, firstly, the two side wall baffles 1 are clamped together, and then installed on the bottom plate 2 by screws. The upper threaded part of the hemispherical screw 6 passes through the screw hole 4-1 on the gantry 4, and the bottom of the ball head cap 7 is fixedly connected to the placeholder 8. The positioning rod 10 on the placeholder 8 passes through the positioning rod hole 4-3, and the gantry 4 is clamped on the side wall baffle 1. Specifically, the sliding protrusion 4-2 on the gantry 4 slides on the side wall slide groove 1-1 and the bottom plate slide groove 2-1, and the pin 5 is inserted into the gantry bolt hole 4-4 to fix the gantry 4 to the bottom plate 2. Then rotate the hand wheel 9 to make the placeholder 8 drop to the bottom plate 2, and the bottom surface of the placeholder 8 is in close contact with the upper surface of the bottom plate 2.

[0063] The concrete mixture is poured to the height of the top of the placeholder block 8, and then dry-cured. Then, the hand wheel 9 is rotated to drive the placeholder block 8 to move upward, and the placeholder block 8 is taken out to obtain the concrete enclosure 11.

[0064] Then, remove the gantry 4 and the hemispherical head screw 6.

[0065] Apply concrete surface retarder 12 on the bottom of the concrete enclosure 11, such as Fig.15 Then pour in the concrete mixture, the concrete mixture is higher than the concrete enclosure 11, such as Figures 16 to 18 . Then put it on the concrete vibration table and vibrate for 15s to 20s, scrape off the excess concrete mixture on the top of the concrete enclosure; cover the surface of the side wall baffle 1 and the bottom plate 2 with plastic film, and then steam cure. The placeholder block 8 in the concrete preparation tool can be accurately installed in the horizontal center position of the first cavity 14. After adding the concrete mixture, the thickness of the side walls of the prepared concrete enclosure 11 is uniform, and the concrete specimen 13 is evenly heated during the curing process.

[0066] After the curing is completed, the side wall baffle 1 and the bottom plate 2 are removed to obtain the concrete specimen 13. Figures 19 to 21 A concrete specimen 13 is formed in the concrete enclosure 11. The same concrete is used for the concrete enclosure 11 and the concrete specimen 13. During the curing process, the concrete enclosure 11 and the concrete specimen 13 can be closely fitted. The deformation of the concrete enclosure 11 and the concrete specimen 13 is coordinated and consistent. The thermal expansion coefficients of the materials are consistent and no cracks will occur, ensuring that subsequent tests can be performed. This avoids the problems of water leakage and deformation of the enclosure caused by bonding in the prior art.

[0067] The surface of the concrete retarder 12 on the concrete surface of the concrete specimen 13 is washed with a high-pressure water gun. Fig. 22 As shown, flush repeatedly until no concrete particles fall off, and then the surface roughness can be tested.

[0068] The detachable steel test mold of the utility model has a small volume, is easy to install and disassemble, and is convenient for laboratory staff to use.

[0069] In summary, the side baffles and bottom plate of the detachable steel test mold of the utility model can be disassembled, and the position of the placeholder block can be fixed through the setting of the gantry and the hemispherical head screw, so as to realize the preparation of the concrete enclosure and ensure the consistency of the enclosure and the test piece material. The detachable steel test mold of the utility model is small in size and easy to install and disassemble.

[0070] The above is a preferred embodiment of the present invention. For ordinary technicians in this technical field, without departing from the principle of the present invention, making some improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A detachable steel test mold, characterized in that: It comprises two L-shaped side wall baffles (1) and a bottom plate (2) mounted on the bottom of the side wall baffles (1); the two side wall baffles (1) are snap-connected to form a first cavity (14) with the bottom plate (2); the first cavity (14) is used to place a placeholder (8); The steel test mold also includes a gantry (4) and a hemispherical screw rod (6); The gantry (4) comprises a crossbeam (4-5) and columns (4-6) fixed on both sides of the crossbeam, and the columns (4-6) are clamped with the outer side walls of the side wall baffles (1); A screw hole (4-1) is provided at the center of the crossbeam (4-5), and the hemispherical screw (6) passes through the screw hole (4-1) and is connected to the spacer block (8); Positioning rod holes (4-3) are evenly arranged around the screw rod hole (4-1) for installing a positioning rod (10), and the positioning rod (10) passes through the positioning rod hole (4-3) and is connected to the spacer block (8); The ball head of the hemispherical screw rod (6) is arranged at the bottom end of the hemispherical screw rod (6), and the hemispherical screw rod (6) is provided with a ball head cap (7) matched with the ball head, and the bottom of the ball head cap (7) is connected to the placeholder block (8).

2. The detachable steel test mold according to claim 1, characterized in that: The outer side wall of the first cavity (14) is symmetrically provided with a vertical side wall slide groove (1-1) located on the side wall baffle (1) and a bottom plate slide groove (2-1) located on the bottom plate (2); a sliding protrusion (4-2) is provided on the inner side of the column (4-6) of the gantry (4), and the side wall slide groove (1-1) and the bottom plate slide groove (2-1) are respectively matched with the sliding protrusion (4-2) for installing and positioning the gantry (4).

3. The detachable steel test mold according to claim 2 is characterized in that: The lower end of the side wall baffle (1) is provided with a screw hole (1-4), the bottom plate (2) is provided with a countersunk hole (2-3), and the side wall baffle (1) and the bottom plate (2) are connected by screws (3).

4. The detachable steel test mold according to claim 3 is characterized in that: The top end of the hemispherical screw rod (6) is connected with a hand wheel (9).

5. The detachable steel test mold according to claim 4, characterized in that: The bottom of the side wall of the gantry (4) is provided with a gantry bolt hole (4-4), the side of the bottom plate (2) is provided with a bottom plate bolt hole (2-2), and the gantry (4) and the bottom plate (2) are fixedly connected by a pin (5).

6. The detachable steel test mold according to claim 5, characterized in that: The size of the first cavity (14) is 150 mm×150 mm×150 mm, and the size of the placeholder block (8) is 100 mm×100 mm×100 mm.

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