Auxiliary device for forming high-water-cement-ratio cement-based test piece and forming device

Abstract

The utility model discloses an auxiliary device and a forming device for forming a high-water-cement-ratio cement-based test piece, which belong to the technical field of grouting material detection and comprise an enclosure frame and a fixing clamp, and a sealing gasket is arranged on the bottom surface of the enclosure frame; the fixing clamp comprises two parallel clamping plates and a web plate vertically connected between the two clamping plates, one clamping plate is provided with a threaded hole with the axis perpendicular to the clamping plate, and a puller bolt is connected into the threaded hole in a threaded mode. During application, the enclosure frame is mounted at the top of the test mold body through the fixing clamps, so that the liquid level of slurry capable of being loaded into a forming device is raised. After the slurry is subjected to bleeding and layering and reaches initial setting, the auxiliary device is taken down, the slurry higher than the top of the test mold body is scraped off, subsequent operation can be carried out, a test piece meeting the size requirement is manufactured, and the accuracy of test data of compressive strength and breaking strength of the test piece is improved. And the enclosure frame and the test mold body can be assembled conveniently and quickly by utilizing the existing carrying port and the fixing clamp on the test mold body.

Description

Technical Field

[0001] The utility model relates to an auxiliary device and a molding device for molding a cement-based test piece with a high water-cement ratio, belonging to the technical field of grouting material detection. Background Art

[0002] The rapid development of social economy and the acceleration of urban construction have brought about the rapid development of underground engineering construction such as highway tunnels, urban subways, water diversion tunnels, and mining. However, these underground projects often encounter engineering geological disasters caused by unfavorable geological bodies during the construction process. At present, grouting has become one of the main means of underground engineering geological disaster management. Among them, cement-based grouting materials are the most commonly used materials in grouting projects. In order to ensure good injectability, cement-based grouting materials usually use a higher water-cement ratio in engineering applications, which will cause the slurry to have very obvious water seepage during the coagulation and solidification process, and the slurry stone rate will not reach 100%. The tests for characterizing the physical and mechanical parameters of cement-based slurry stone bodies, such as compressive strength, flexural strength and free expansion rate, usually adopt the test mold size specified by national or industry standards. For example, the cement mortar test mold used to test the compressive strength and flexural strength of cement-based slurry stone bodies adopts the test mold size specified in GB / T17671-2021 "Test Method for Cement Mortar Strength (ISO Method)", and the slurry stone body specimens made by the test mold are prisms with a size of 40mm×40mm×160mm. Therefore, during the compressive strength and flexural strength tests of high water-cement ratio cement-based grouting materials, although the prepared slurry filled the mold groove, water layers would appear in the upper layer of the mold groove due to slurry seepage during the subsequent tests, resulting in the actual molding height of the specimen not meeting the requirements, which in turn led to inaccurate compressive strength and flexural strength test data. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an auxiliary device and a molding device for molding high water-cement ratio cement-based test pieces, which are suitable for manufacturing test pieces of compressive strength and flexural strength of high water-cement ratio cement-based grouting materials and can improve the accuracy of test data.

[0004] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0005] On the one hand, the utility model provides an auxiliary device for forming a test mold for a cement-based specimen with a high water-cement ratio, comprising a protective frame and a fixing clamp, wherein the protective frame is a rectangular structure formed by connecting four side panels end to end, and a sealing gasket is provided on the bottom surface of the protective frame;

[0006] The fixing clamp comprises two parallel clamping plates and a web vertically connected between the two clamping plates, wherein one of the clamping plates is provided with a threaded hole whose axis is vertical to the clamping plate, and a tightening bolt is threadedly connected in the threaded hole.

[0007] Optionally, a tightening plate is provided at the front end of the tightening bolt, and the diameter of the tightening plate is larger than that of the tightening bolt.

[0008] Optionally, the tightening bolt is connected to the tightening plate via a connecting column, and the connecting column is coaxially fixed to the front end of the tightening bolt. A cavity is provided in the tightening plate, and a channel is opened in the cavity wall of the cavity. The front end of the connecting column extends into the cavity from the channel, and the front end of the connecting column is connected to an anti-detachment platform, the diameter of the connecting column is smaller than the inner diameter of the channel, and the diameter of the anti-detachment platform is larger than the inner diameter of the channel.

[0009] On the other hand, the utility model provides a molding device, including a trial mold body and the auxiliary device, the trial mold body includes a base, a first end plate, a second end plate and a plurality of partitions, each partition is arranged in parallel on the top of the base, the first end plate and the second end plate are respectively blocked at both ends of the partition, and the two opposite sides of the base are provided with a transport port;

[0010] The enclosure frame is placed on the top of the test mold body, two parallel side plates constituting the enclosure frame are respectively placed on the top of the first end plate and the second end plate, and the other two parallel side plates constituting the enclosure frame are respectively placed on the top of the two outermost partitions;

[0011] The enclosure frame is fastened to the top of the test mold body by two fixing clamps, one of the clamping plates in each fixing clamp is pressed against the transport port, and the tightening bolt on the other clamping plate is pressed against the top of the enclosure frame.

[0012] The beneficial effects of this application include but are not limited to:

[0013] The auxiliary device and forming device for forming a test mold for high water-cement ratio cement-based specimens provided by the utility model are applied to the compressive strength and flexural strength test of high water-cement ratio cement-based grouting materials. The enclosure frame is installed on the top of the test mold body through a fixing clamp, so that the effective height of the forming device is increased, thereby raising the level of the slurry that can be loaded into the forming device. When the slurry reaches initial setting after water exudation and stratification, the auxiliary device is removed, and the slurry above the top of the test mold body is scraped flat, and subsequent operations can be carried out to form a test piece that meets the size requirements, thereby improving the accuracy of the test data of the compressive strength and flexural strength of the test piece. Moreover, the enclosure frame and the test mold body can be assembled using the existing handling port and fixing clamp on the test mold body, which is convenient, fast and reusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 A three-dimensional diagram of an auxiliary device for forming a test mold for a cement-based test piece with a high water-cement ratio provided by the utility model;

[0016] Figure 2 A side view of an auxiliary device for forming a test mold for a cement-based test piece with a high water-cement ratio provided by the utility model;

[0017] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0018] Figure 4 It is a top view of the trial mold body;

[0019] Figure 5 It is a side view of the trial mold body;

[0020] Figure 6 This is a schematic diagram of the molding device provided by the utility model, and the molding device is assembled from the auxiliary device and the trial mold body;

[0021] Figure 7 This is a schematic diagram of the liquid level when the slurry is injected into the molding device during the test;

[0022] Figure 8 for Figure 7 Enlarged view of middle part B;

[0023] Fig. 9 It is a schematic diagram of the initial setting of the slurry in the molding device;

[0024] Fig.10 This is a schematic diagram after the auxiliary device is removed and the slurry on the top of the test mold body is scraped off;

[0025] In the figure, 100, the enclosure frame; 200, the fixing clamp; 210, the clamping plate; 220, the web; 230, the tightening bolt; 231, the tightening plate; 232, the connecting column; 233, the cavity; 234, the anti-dropping platform; 300, the sealing gasket; 400, the test mold body; 410, the base; 420, the first end plate; 430, the second end plate; 440, the partition; 450, the handling port; 500, the water seepage layer. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0027] It should be noted that many specific details are described in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0028] The auxiliary device for forming a test mold for a high water-cement ratio cement-based test piece provided by the utility model needs to be Figure 4 , Figure 5 The specific structure of the test mold body (usually referred to as the cement mortar test mold), the method of preparing the standard test piece using the test mold body, and the method of performing the compression test on the standard test piece refer to the standard provisions in GB / T17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)".

[0029] like Figure 1-Figure 3 As shown, the auxiliary device for forming a test mold for high water-cement ratio cement-based specimens provided by the utility model includes a protective frame 100 and a fixing clamp 200. The protective frame 100 is a rectangular structure composed of four side panels connected end to end, and a sealing gasket 300 is arranged on the bottom surface of the protective frame 100.

[0030] The fixing clamp 200 includes two parallel clamping plates 210 and a web 220 vertically connected between the two clamping plates 210. One of the clamping plates 210 is provided with a threaded hole whose axis is vertical to the clamping plate 210, and a jacking bolt 230 is threadedly connected in the threaded hole. Usually, a handle is provided on the top of the jacking bolt.

[0031] When in use, the enclosure frame 100 is placed on the top of the trial mold body 400 to heighten the trial mold body 400 .

[0032] Specifically, the molding device provided by the present invention includes a test mold body 400 and the above-mentioned auxiliary device. The test mold body 400 is a conventional test tool in the art, including a base 410, a first end plate 420, a second end plate 430 and a plurality of partitions 440, each of which is arranged in parallel on the top of the base 410, and the first end plate 420 and the second end plate 430 are respectively blocked at both ends of the partition 440.

[0033] In order to facilitate transportation, the trial mold body 400 currently on the market is basically provided with a transportation port 450 on two opposite sides of the base 410. Usually, four partition plates 440 are provided to form three mold grooves.

[0034] like Figure 6As shown in , when in use, the enclosure frame 100 is placed on the top of the test mold body 400, two parallel side plates constituting the enclosure frame 100 are respectively placed on the top of the first end plate 420 and the second end plate 430, and the other two parallel side plates constituting the enclosure frame 100 are respectively placed on the top of the two partitions 440 arranged on the outermost sides. The enclosure frame 100 is fastened to the top of the test mold body 400 by two fixing clamps 200. Specifically, one of the clamps 210 in each fixing clamp 200 is pressed against the transport port 450, and the other clamp 210 is located above the enclosure frame 100. The tightening bolt 230 on the clamp 210 is rotated so that the end of the tightening bolt 230 is pressed against the top of the enclosure frame 100. In this way, the enclosure frame 100 is fixed to the top of the test mold body 400, so that the casting cavity extends upward. The gap between the bottom surface of the enclosure frame 100 and the top surface of the test mold body 400 is sealed by the sealing gasket 300.

[0035] During the test, the following steps were followed: (1) After the slurry was prepared, it was loaded into the molding device in layers, such as Figure 7 As shown in , after the slurry fills the three mold grooves of the test mold body 400, the liquid level continues to rise into the enclosure frame 100, and the slurry needs to be spread flat and vibrated; (2) Stand still and observe, as shown in FIG. Fig. 9 As shown in FIG, after the slurry in the molding device is settled and layered (the exudate accumulates in the upper layer to form an exudate layer 500), the fixing clamp 200 is loosened, and the enclosure frame 100 is removed. The slurry above the test mold body 400 will overflow; (3) Take a scraper and slowly move it toward the other end along the length direction of the test mold body 400 to scrape off and smooth the slurry exceeding the test mold body 400 to achieve the following result. Fig.10 Status shown in .

[0036] Then, refer to the conventional methods to number, cure, demould, cure, measure and other processes on the test pieces in the mold cavity.

[0037] like Figure 8 As shown in , a card slot can be provided on the bottom surface of the enclosure frame 100, and a protrusion can be provided on the top surface of the sealing gasket 300, and the sealing gasket 300 can be prevented from falling off by the cooperation between the card slot and the protrusion.

[0038] In a preferred embodiment, in order to increase the tightening area, a tightening plate 231 is preferably provided at the front end of the tightening bolt 230 , and the diameter of the tightening plate 231 is larger than that of the tightening bolt 230 .

[0039] Further, such as Figure 3As shown in , the tension bolt 230 is connected to the tension disk 231 through the connecting column 232, the connecting column 232 is coaxially fixed to the front end of the tension bolt 230, a cavity 233 is provided in the tension disk 231, the cavity wall of the cavity 233 is provided with a channel, the front end of the connecting column 232 extends into the cavity 233 from the channel, the front end of the connecting column 232 is connected to the anti-detachment platform 234, the diameter of the connecting column 232 is smaller than the inner diameter of the channel, and the diameter of the anti-detachment platform 234 is larger than the inner diameter of the channel, so as to prevent the connection column from being separated from the tension disk. In this way, when the tension bolt 230 is rotated, the tension disk 231 at the end of the tension bolt 230 will abut against the top of the test mold body 400, and the end of the tension bolt 230 will abut against the top of the pressure disk. Since the contact surface between the tension disk 231 and the test mold body 400 is large, the friction coefficient between them is large, and the friction force is large, when the tension bolt 230 is continuously rotated, the tension bolt 230 will rotate forward relative to the tension disk 231, but the tension disk 231 will remain stationary relative to the test mold body 400, so as to prevent the tension disk 231 from scratching the enclosure frame 100. After the tension bolt 230 is tightened, the enclosure frame 100 can be firmly fixed on the top of the test mold body 400.

[0040] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The above specific implementation manner cannot be used as a limitation on the protection scope of the utility model. For technicians in this technical field, any replacement, improvement or transformation made to the implementation manner of the utility model falls within the protection scope of the utility model.

[0043] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An auxiliary device for forming a test mold for cement-based specimens with a high water-cement ratio, characterized in that: It includes a protective frame and a fixing clamp, wherein the protective frame is a rectangular structure formed by four side panels connected end to end, and a sealing gasket is provided on the bottom surface of the protective frame; The fixing clamp comprises two parallel clamping plates and a web vertically connected between the two clamping plates, wherein one of the clamping plates is provided with a threaded hole whose axis is vertical to the clamping plate, and a tightening bolt is threadedly connected in the threaded hole.

2. The auxiliary device for forming a test mold for high water-cement ratio cement-based specimens according to claim 1, characterized in that: A tightening plate is arranged at the front end of the tightening bolt, and the diameter of the tightening plate is larger than that of the tightening bolt.

3. The auxiliary device for forming a test mold for high water-cement ratio cement-based specimens according to claim 1, characterized in that: The tightening bolt is connected to the tightening plate through a connecting column, and the connecting column is coaxially fixed to the front end of the tightening bolt. A cavity is provided in the tightening plate, and a channel is opened in the cavity wall of the cavity. The front end of the connecting column extends into the cavity from the channel, and the front end of the connecting column is connected to an anti-detachment platform. The diameter of the connecting column is smaller than the inner diameter of the channel, and the diameter of the anti-detachment platform is larger than the inner diameter of the channel.

4. A molding device, characterized in that: The invention comprises a test mold body and the auxiliary device according to claim 1, wherein the test mold body comprises a base, a first end plate, a second end plate and a plurality of partitions, each of which is arranged in parallel on the top of the base, the first end plate and the second end plate are respectively sealed at both ends of the partition, and a conveying port is opened on two opposite sides of the base; The enclosure frame is placed on the top of the test mold body, two parallel side plates constituting the enclosure frame are respectively placed on the top of the first end plate and the second end plate, and the other two parallel side plates constituting the enclosure frame are respectively placed on the top of the two outermost partitions; The enclosure frame is fastened to the top of the test mold body by two fixing clamps, one of the clamping plates in each fixing clamp is pressed against the transport port, and the tightening bolt on the other clamping plate is pressed against the top of the enclosure frame.

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