Mold for testing early-stage shrinkage performance of lime mortar

Abstract

The utility model belongs to the technical field of lime mortar, and particularly relates to a mould for testing the early shrinkage performance of lime mortar, which comprises a sheet bar, the lower surface of the sheet bar is fixedly connected with an iron stand on a cement mortar compaction table, a fixed frame is arranged on the sheet bar, an outer frame capable of being spliced is arranged in the fixed frame, and the outer frame is connected with the cement mortar compaction table. The bottom of the outer frame capable of being spliced is in threaded connection with a spiral ejector rod, a splicing type cylinder is installed in the outer frame capable of being spliced, and the splicing type cylinder is used for containing lime mortar. Compared with a square mold in the prior art, the spliced type cylinder is adopted, so that the spliced type cylinder is higher in bearing capacity, not prone to fracture and deformation during demolding, and convenient to test in the later period. According to the utility model, the spiral ejector rod is in threaded connection with the outer frame capable of being spliced, so that a test piece is subjected to uniform force during demolding, the risk of fracture and deformation of the test piece is reduced, and a fixing effect is achieved to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of lime mortar, and in particular relates to a mold used for testing the early shrinkage performance of lime mortar. Background Art

[0002] As one of the earliest non-carbon cementitious materials used in the construction field, lime has moderate mechanical strength, good air permeability and flexibility, and is well compatible with ancient buildings. It has irreplaceable advantages over other materials in the restoration of cultural relics. Since the 1850s, Europe has begun to industrialize the production of hydraulic lime. In the 1970s, this material was used in the protection and restoration of ancient buildings. In 2006, my country introduced hydraulic lime to restore cultural relics such as the Huashan Rock Paintings in Guangxi and the Pingyao Ancient City, with very ideal results.

[0003] In the process of cultural relic restoration, the use of lime mortar with small volume shrinkage can effectively reduce the secondary damage to cultural relics. In view of this, the shrinkage of lime mortar, as an important indicator to characterize its volume stability, has attracted widespread attention from scholars. However, the slow setting speed, low early strength and poor durability of lime mortar need to be solved urgently, which makes it difficult to test its performance.

[0004] At present, there are some test molds for testing shrinkage performance on the market. Compared with high-strength and high-hardness materials, there are inconveniences in operation when using those test molds to test the shrinkage of lime mortar.

[0005] The existing lime mortar shrinkage performance test molds include TDM-SJS, GY-ASE1000D and other models. When using the above molds to test the shrinkage of lime mortar, it is necessary to wait for the test piece to dry and harden, remove it from the mold, and use a vertical mortar shrinkage and expansion instrument to test its shrinkage. However, these test molds generally have several problems, such as: the lime mortar has a long setting time, and it is difficult to demold and test it in the early stage when the shrinkage is most obvious; the lime mortar has a low strength, and the lime mortar test block is prone to damage during the demolding process.

[0006] Therefore, developing a new mold for lime mortar shrinkage testing is of great practical significance for testing the early shrinkage of lime mortar, exploring its volume stability, and better applying it to the restoration of cultural relics and buildings. Utility Model Content

[0007] In view of the above problems, the utility model provides a mold for testing the early shrinkage performance of lime mortar.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A mold for testing the early shrinkage performance of lime mortar comprises a plate, the lower surface of the plate is fixedly connected to an iron frame on a cement mortar vibrating table, a fixed frame is installed on the plate, a splicable external frame is installed in the fixed frame, a spiral push rod is threadedly connected to the bottom of the splicable external frame, a spliced ​​cylindrical barrel is installed in the spliced ​​external frame, and the spliced ​​cylindrical barrel is used to hold lime mortar.

[0010] Furthermore, the spliced ​​cylindrical barrel is formed by splicing a plurality of arc-shaped plates.

[0011] Furthermore, the splicable external frame includes two splicing modules with L-shaped cross-sections, at least two studs are fixedly arranged on one of the splicing surfaces of the splicing modules, and through holes corresponding to the studs are opened on the other splicing surface of the splicing module. The studs are connected with butterfly nuts through the through holes to achieve a fixed connection between the two splicing modules, a groove for making way for the butterfly nut is opened on the inner side wall of the fixed frame, a connecting thread is arranged on the lower part of the inner side of the splicing module, and a receiving groove is opened below the connecting thread.

[0012] Furthermore, a limit strip is fixedly arranged on one of the outer sides of the splicing module, and a limit groove corresponding to the limit strip is opened inside the fixed frame.

[0013] Furthermore, the fixing frame includes a fixing portion with an opening on one side and a movable portion connected to the fixing portion by bolts, and the fixing portion is fixedly mounted on the plate.

[0014] Furthermore, the spiral push rod includes a threaded portion corresponding to the connecting thread, a smooth flat plate in contact with the spliced ​​cylindrical tube is provided on the upper end surface of the threaded portion, a nut is fixedly connected to the lower end of the threaded portion, and a handle is fixedly connected to the lower surface of the nut, and the nut and the handle are both located in the accommodating groove when in use.

[0015] Furthermore, a plurality of groups of clamping plates are fixedly provided on the lower surface of the plate, and each group of clamping plates is fixedly mounted on the iron frame by bolts to achieve a fixed connection between the plate and the iron frame.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The utility model adopts a spliced ​​cylindrical barrel, which has a stronger bearing capacity than the square mold in the prior art, is not easy to break or deform during demoulding, and is convenient for later testing.

[0018] The spiral ejector in the utility model is threadedly connected to the splicable external frame, so that the test piece is subjected to uniform force during demoulding, reducing the risk of test piece breakage and deformation, and playing a fixing role to a certain extent. At the same time, the threaded connection helps to better control the looseness between the test piece and the mold during the disassembly process, reduce the adhesion between the test piece and the mold, and facilitate demoulding. In addition, the handle on the spiral ejector is suitable for support and hand holding, which is convenient for twisting.

[0019] The spliced ​​cylindrical tube in the utility model is tightly fitted with the spliced ​​external frame, which plays a good fixing role. At the same time, the spliced ​​external frame can be disassembled into two halves, making it more convenient to store and carry.

[0020] The utility model combines the mold with the cement mortar vibrating table, can realize the rapid coagulation of lime mortar, and accelerates the working efficiency. Meanwhile, the combination with the cement mortar vibrating table also reduces the cost of remaking corresponding instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the installation between the spliced ​​external frame, the spiral top rod and the spliced ​​cylindrical tube of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the fixed frame of the utility model;

[0024] Figure 4 It is a schematic diagram of the connection between the plate, the iron frame and the clamping plate of the utility model;

[0025] In the figure, plate 1, iron frame 2, fixed frame 3, splicable external frame 4, spiral top rod 5, spliced ​​cylindrical tube 6, splint 7, groove 301, limit groove 302, fixed part 303, movable part 304, splicing module 401, stud 402, through hole 403, butterfly nut 404, connecting thread 405, accommodating groove 406, limit strip 407, threaded part 501, smooth flat plate 502, nut 503, handle 504, arc plate 601. DETAILED DESCRIPTION

[0026] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0027] like Figures 1 to 4As shown, a mold for testing the early shrinkage performance of lime mortar includes a plate 1, on the lower surface of which a plurality of groups of plywood 7 are fixedly arranged, and each group of plywood 7 is fixedly mounted on an iron frame 2 by bolts to achieve a fixed connection between the plate 1 and the iron frame 2 on a cement mortar vibration table, a fixed frame 3 is installed on the plate 1, a splicable external frame 4 is installed in the fixed frame 3, a spiral jack 5 is threadedly connected to the bottom of the splicable external frame 4, and a spliced ​​cylindrical barrel 6 is installed in the splicable external frame 4, and the spliced ​​cylindrical barrel 6 is used to hold lime mortar.

[0028] The spliced ​​cylindrical tube 6 is formed by splicing a plurality of arc-shaped plates 601 .

[0029] The splicable external frame 4 includes two splicing modules 401 with an L-shaped cross-section, at least two studs 402 are fixedly arranged on one of the splicing surfaces of the splicing module 401, and a through hole 403 corresponding to the stud 402 is opened on the other splicing surface of the splicing module 401, and the stud 402 is connected with a butterfly nut 404 through the through hole 403 to achieve a fixed connection between the two splicing modules 401, and a groove 301 for making way for the butterfly nut 404 is opened on the inner side wall of the fixed frame 3, a connecting thread 405 is arranged at the lower part of the inner side of the splicing module 401, and a receiving groove 406 is opened below the connecting thread 405, a limit strip 407 is fixedly arranged on one of the outer sides of the splicing module 401, and a limit slot 302 corresponding to the limit strip 407 is opened inside the fixed frame 3.

[0030] The fixing frame 3 includes a fixing portion 303 with an opening on one side and a movable portion 304 connected to the fixing portion 303 by bolts. The fixing portion 303 is fixedly mounted on the plate 1 .

[0031] The spiral top rod 5 includes a threaded portion 501 corresponding to the connecting thread 405, and a smooth flat plate 502 in contact with the spliced ​​cylindrical tube 6 is arranged on the upper end surface of the threaded portion 501. A nut 503 is fixedly connected to the lower end of the threaded portion 501, and a handle 504 is fixedly connected to the lower surface of the nut 503. The nut 503 and the handle 504 are both located in the accommodating groove 406 when in use.

[0032] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mold for testing the early shrinkage performance of lime mortar, characterized in that: The invention comprises a plate (1), the lower surface of which is fixedly connected to an iron frame (2) on a cement mortar vibrating table, a fixed frame (3) being installed on the plate (1), a splicable external frame (4) being installed inside the fixed frame (3), a spiral jack (5) being threadedly connected to the bottom of the splicable external frame (4), and a splicable cylindrical barrel (6) being installed inside the splicable external frame (4), wherein the splicable cylindrical barrel (6) is used to contain lime mortar.

2. A mold for testing early shrinkage performance of lime mortar according to claim 1, characterized in that: The spliced ​​cylindrical barrel (6) is formed by splicing a plurality of arc-shaped plates (601).

3. A mold for testing early shrinkage performance of lime mortar according to claim 1, characterized in that: The splicable external frame (4) comprises two splicing modules (401) with an L-shaped cross section, at least two studs (402) are fixedly arranged on one of the splicing surfaces of the splicing module (401), through holes (403) corresponding to the studs (402) are provided on the other splicing surface of the splicing module (401), the studs (402) pass through the through holes (403) and are connected with butterfly nuts (404) for realizing fixed connection between the two splicing modules (401), a groove (301) for making way for the butterfly nuts (404) is provided on the inner side wall of the fixed frame (3), a connecting thread (405) is provided on the lower part of the inner side of the splicing module (401), and a receiving groove (406) is provided below the connecting thread (405).

4. A mold for testing early shrinkage performance of lime mortar according to claim 3, characterized in that: A limit strip (407) is fixedly arranged on one of the outer sides of the splicing module (401), and a limit groove (302) corresponding to the limit strip (407) is opened inside the fixed frame (3).

5. A mold for testing early shrinkage performance of lime mortar according to claim 4, characterized in that: The fixed frame (3) comprises a fixed portion (303) with an opening on one side and a movable portion (304) connected to the fixed portion (303) by bolts, and the fixed portion (303) is fixedly mounted on the plate (1).

6. A mold for testing early shrinkage performance of lime mortar according to claim 3, characterized in that: The spiral push rod (5) includes a threaded portion (501) corresponding to the connecting thread (405), a smooth flat plate (502) in contact with the spliced ​​cylindrical tube (6) is provided on the upper end surface of the threaded portion (501), a nut (503) is fixedly connected to the lower end of the threaded portion (501), and a handle (504) is fixedly connected to the lower surface of the nut (503), and the nut (503) and the handle (504) are both located in the receiving groove (406) when in use.

7. A mold for testing early shrinkage performance of lime mortar according to claim 1, characterized in that: A plurality of groups of clamping plates (7) are fixedly arranged on the lower surface of the plate (1), and each group of clamping plates (7) is fixedly mounted on the iron frame (2) by means of bolts, so as to realize a fixed connection between the plate (1) and the iron frame (2).

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