CN115977138B - Construction method of equipment foundation base based on metamaterial - Google Patents

Abstract

The invention relates to a construction method of a device foundation base based on a metamaterial. According to the invention, the metamaterial with the anti-seismic and mechanical impact absorption properties, the sand and the reinforced concrete are integrated together to form the shooting equipment foundation base capable of well absorbing impact energy transmitted from the lower direction of the foundation surface of the equipment, so that the loss of processing precision of the vibration numerical control equipment can be greatly reduced.

Description

A construction method for a device foundation based on metamaterials

Technical Field

The invention relates to the technical field of equipment shock absorption, and in particular to a construction method of an equipment foundation pedestal based on metamaterials.

Background technique

CNC machine tools are high-precision processing machines, and the requirements for the equipment foundation are very high. If there is a vibration source nearby during the processing, the vibration will be transmitted, which will affect the processing accuracy of the CNC machine tool. Therefore, the foundation of traditional CNC machine tools is surrounded by a layer of shockproof belt to isolate the vibration transmitted laterally. However, for vibration sources that are lower than the foundation surface of the equipment, such as near CNC equipment, for example, when stamping equipment within a range of more than ten meters is working, its vibration will be transmitted from the bottom of the equipment to the top, affecting the processing accuracy of the machine tool. According to measurements, it will affect the processing accuracy by 0.01-0.03mm.

The bottom of the traditional CNC machine tool equipment foundation is based on the rammed soil. First, a layer of 100-300mm thick medium sand or gravel is laid and rammed to form the equipment foundation cushion layer, and then 100mm thick C15 concrete is made on it, and then the equipment foundation is made on it. This kind of foundation base cannot reduce or avoid the vibration transmitted from the bottom to the top, which will affect the processing accuracy of the CNC machine tool.

Metamaterials are artificially designed materials/structures. Artificially designed metamaterials can not only be used for structural bearing, but also have the special properties of functional materials. Through the integrated optimization design of metamaterials/structures, negative stiffness, negative refractive index, negative Poisson's ratio, negative thermal expansion, etc. can be achieved. In particular, negative Poisson's ratio metamaterials have good seismic resistance and can absorb mechanical impact energy.

Summary of the invention

In view of the defects existing in the prior art, the purpose of the present invention is to provide a construction method of a metamaterial-based equipment foundation. The metamaterial equipment foundation construction method integrates metamaterials with seismic resistance and mechanical impact absorption performance with sand and reinforced concrete to form an equipment foundation that can well absorb the impact energy transmitted upward from the bottom of the foundation where the equipment is located, which can greatly reduce the loss of machining accuracy of CNC equipment caused by vibration.

In order to achieve the above purpose, the technical solution adopted by the present invention is:

A construction method for a metamaterial-based equipment foundation base, characterized in that it comprises the following steps:

Step 1, dig a rectangular ground trough 100 on the bottom surface, and keep the excavated soil for later use; prefabricate the steel bars of the base 1 and the retaining wall 2 on the four sides of the bottom of the ground trough 100, and then cast them with cement to form an integrated structure of the base 1 and the retaining wall 2. The top surface of the cast retaining wall 2 should be flush with the ground, and the outer side of the retaining wall 2 and the inner wall of the ground trough 100 are filled with soil and compacted; the base trough area is filled with soil and compacted to form a soil layer 5, and the soil layer 5 is flush with the top surface of the base 1;

Step 2, neatly stack the metamaterial bodies into a square body 3, and place it on the top surface of the plain soil layer 5, so that the four side walls of the square body 3 are in contact with the inner wall of the retaining wall 2 respectively; the gaps in the square body 3 are filled with sand, and the sand covers the entire top surface of the square body 3 and is compacted;

Step 3, pouring concrete on the top of the sand on the top surface of the square body 3 to form a concrete cushion layer 4 covering the entire top of the sand;

Step 4, prefabricate steel bars on the concrete cushion layer 4, and then pour cement to form a foundation seat 6. The top surface of the poured foundation seat 6 is flush with the ground, and there is a gap between the four surfaces of the foundation seat 6 and the inner side surfaces of the corresponding retaining wall 2 to form an earthquake-resistant trench 17; equipment is placed on the top surface of the foundation seat 6.

On the basis of the above scheme, the square body 3 is formed by stacking metamaterial bodies;

The metamaterial body comprises a bottom plate 7, a top plate 8 and four vertical side plates 9. A vertical connecting rod Ⅰ10 and a vertical connecting rod Ⅱ11 with the same axial direction are respectively arranged at the center of the top surface of the bottom plate 7 and the center of the bottom surface of the top plate 8; a horizontal connecting rod 12 is arranged at the center of the inner side surface of each vertical side plate 9, and the horizontal connecting rods 12 on the opposite vertical side plates 9 have the same axial direction;

The top of the vertical link Ⅰ10 is provided with four oblique links Ⅰ13, each oblique link Ⅰ13 is arranged outwardly and downwardly; the bottom of the vertical link Ⅱ11 is provided with four oblique links Ⅱ14, each oblique link Ⅱ14 is arranged outwardly and upwardly;

The ends of each horizontal link 12 are respectively provided with an oblique link III15 and an oblique link IV16; the oblique link III15 is arranged outwardly and tilted downward, and the end of the oblique link III15 is connected to the end of the corresponding oblique link I13; the oblique link IV16 is arranged outwardly and tilted upward, and the end of the oblique link IV16 is connected to the end of the corresponding oblique link II14.

On the basis of the above scheme,

The specific structure of the square body 3 is as follows: the bottom plate 7 of the metamaterial body located above is placed on the top plate 8 of the metamaterial body below and is aligned with it; the right vertical side plate 9 of the metamaterial body located on the left is aligned with the left vertical side plate 9 of the metamaterial body on the right and contacts each other; the rear vertical side plate 9 of the metamaterial body located on the front side is aligned with the front vertical side plate 9 of the metamaterial body on the rear side and contacts each other.

On the basis of the above scheme, the preparation method of the metamaterial body is:

Making a resin mold corresponding to the shape of the metamaterial body;

Mix SYLGARD-184 polydimethylsiloxane and SYLGARD-184 silicone elastomer curing agent in a ratio of 7:1;

The mixture is allowed to stand at room temperature for 12 hours, and after the bubbles in the mixed liquid are completely discharged, it is poured into a resin mold and heated for molding;

After the metamaterial body is formed, it is cooled and left to stand at room temperature, and the resin mold is removed after it is completely solidified.

On the basis of the above scheme,

The thickness of the concrete cushion layer 4 in step 3 is 80-130 mm.

The construction method of a metamaterial-based equipment foundation base described in the present invention has the following beneficial effects:

(1) By utilizing the excellent anti-seismic and energy-absorbing properties of silicone rubber metamaterials, combined with sand and concrete components, a base pedestal is formed that can effectively absorb the vibration transmitted upward from the ground. CNC equipment is placed on the base pedestal, which can effectively reduce the impact of vibration on the processing accuracy of the CNC equipment, and can reduce the impact of vibration on processing accuracy by more than 90%.

(2) The construction method of the above-mentioned equipment foundation fully considers the actual conditions of the production workshop. The construction method is scientific and reasonable, easy to implement, and has a short construction period.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention has the following accompanying drawings:

FIG1 is a schematic structural diagram of a metamaterial device base provided by the present invention;

FIG2 is a schematic diagram of the structure of a metamaterial body provided by the present invention;

FIG3 is a schematic structural diagram of a metamaterial body provided by the present invention without the vertical side plate on the front side;

FIG. 4 is a schematic structural diagram of a square body formed by stacking metamaterial bodies provided by the present invention.

In the figure: 100, ground trough; 1, base; 2, retaining wall; 3, square body, 4, concrete cushion layer, 5, plain soil layer, 6, foundation seat, 7, bottom plate, 8, top plate, 9, vertical side plate, 10, vertical connecting rod I, 11, vertical connecting rod II, 12, horizontal connecting rod, 13, oblique connecting rod I, 14, oblique connecting rod II, 15, oblique connecting rod III, 16, oblique connecting rod IV, 17, seismic trench.

Detailed ways

The present invention is further described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 2 and Fig. 3, the metamaterial body of the present invention comprises a bottom plate 7, a top plate 8, a vertical side plate 9, a vertical connecting rod I 10, a vertical connecting rod II 11, a horizontal connecting rod 12, an oblique connecting rod I 13, an oblique connecting rod II 14, an oblique connecting rod III 15, and an oblique connecting rod IV 16; the vertical side plates 9 are provided with four groups, and the bottom plate 7, the top plate 8, and the vertical side plates 9 are all square plates of the same size; the four groups of vertical side plates 9 are parallel to the four side surfaces of the bottom plate 7 and the top plate 8 respectively; the center of the top surface of the bottom plate 7 and the center of the bottom surface of the top plate 8 are respectively provided with a vertical connecting rod I 10 and a vertical connecting rod II 11 of the same axial direction; the top end of the vertical connecting rod I 10 Four groups of oblique connecting rods Ⅰ13 are provided, and the oblique connecting rods Ⅰ13 are arranged outwardly and tilted downward; four groups of oblique connecting rods Ⅱ14 are provided at the lower end of the vertical connecting rod Ⅱ11, and the oblique connecting rods Ⅱ14 are arranged outwardly and tilted upward; a group of horizontal connecting rods 12 are respectively provided at the center of the inner side surface of the vertical side plate 9, and the horizontal connecting rods 12 on the opposite vertical side plates 9 have the same axial direction; the ends of each group of horizontal connecting rods 12 are respectively provided with oblique connecting rods Ⅲ15 and oblique connecting rods Ⅳ16; the oblique connecting rod Ⅲ15 is arranged outwardly and tilted downward, and its end is connected to the end of the oblique connecting rod Ⅰ13; the oblique connecting rod Ⅳ16 is arranged outwardly and tilted upward, and its end is connected to the end of the oblique connecting rod Ⅱ14;

The diameters of the vertical connecting rod Ⅰ10, the vertical connecting rod Ⅱ11, and the horizontal connecting rod 12 are 12-20 _mm , and the diameters of the oblique connecting rod Ⅰ13, the oblique connecting rod Ⅱ14, the oblique connecting rod Ⅲ15, and the oblique connecting rod Ⅳ16 are 8-12 _mm .

In the structure composed of each group of horizontal connecting rods 12 and their corresponding oblique connecting rods Ⅰ13, Ⅱ14, Ⅲ15 and Ⅳ16: the angle between the horizontal connecting rod 12 and the oblique connecting rod Ⅲ15, and the angle between the horizontal connecting rod 12 and the oblique connecting rod Ⅳ16 are both 60°; the angle between the oblique connecting rod Ⅲ15 and the oblique connecting rod Ⅰ13, and the angle between the oblique connecting rod Ⅳ16 and the oblique connecting rod Ⅱ14 are both 30°; the angle between the oblique connecting rod Ⅰ13 and the vertical connecting rod Ⅰ10, and the angle between the oblique connecting rod Ⅱ14 and the vertical connecting rod Ⅱ11 are both 60°; and the axes of these connecting rods are located in the same vertical plane.

The method for preparing the metamaterial body comprises the following steps:

Make a resin mold, then mix SYLGARD-184 polydimethylsiloxane and SYLGARD-184 silicone elastomer curing agent in a ratio of 7:1, and let it stand at room temperature for 12 hours. After the bubbles in the mixed liquid are completely discharged, pour it into the pre-prepared resin mold and bake it, then cool it to room temperature and let it stand. After it is completely cured, cool it and remove the resin mold.

As shown in FIGS. 1 and 4 , the construction method of the metamaterial device foundation base includes the following steps:

A. Dig a square ground trough on the ground, and keep the excavated soil for later use; prefabricate the steel bars of the base 1 and the retaining wall 2 around the bottom of the ground trough 100, and then pour cement to form a concrete assembly, the top surface of the retaining wall 2 is flush with the ground, and the space between the outer side of the retaining wall 2 and the inner wall of the ground trough is filled with soil and compacted; fill the base trough area surrounded by the base 1 and the retaining wall 2 with soil and compact it to form a soil layer 5, and the soil layer 5 is flush with the top surface of the base 1;

B. neatly stack the metamaterial bodies into a square body 3, and place it on the top surface of the plain soil layer 5, so that the four side walls of the square body 3 are in contact with the inner wall of the retaining wall 2 respectively; fill the gaps in the square body 3 with sand, and the sand covers the entire top surface of the square body 3 and is compacted;

The specific structure of the metamaterial bodies stacked into a square body 3 is as follows: the bottom plate 7 of the metamaterial body located above is placed on the top plate 8 of the metamaterial body below and aligned with it; the right vertical side plate 9 of the metamaterial body located on the left is aligned with the left vertical side plate 9 of the metamaterial body on the right and in contact with each other; the rear vertical side plate 9 of the metamaterial body located on the front side is aligned with the front vertical side plate 9 of the metamaterial body on the rear side and in contact with each other. The metamaterial bodies are stacked layer by layer into a square body 3, and the side plates 9 of each metamaterial body are in contact and aligned with each other; in addition, except for the top and bottom metamaterial bodies, the top plate 8 of each metamaterial body is in contact and aligned with the bottom plate 7 of the metamaterial body above it, and the bottom plate 7 of each metamaterial body is in contact and aligned with the top plate 8 of the metamaterial body below it.

C. Pour C15 concrete on the top of the sand on the top surface of the square body 3 to form a concrete cushion 4 covering the entire top surface of the sand;

D. Prefabricated steel bars are placed on the concrete cushion layer 4 and then poured with cement to form a foundation seat 6. The top surface of the foundation seat 6 is flush with the ground. A 200mm gap is left between the four surfaces of the foundation seat 6 and the inner side surfaces of the corresponding retaining wall 2 to form an earthquake-resistant trench 17. Equipment is placed on the top surface of the foundation seat 6.

The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims (3)

1. A construction method for a metamaterial-based equipment foundation, characterized in that it comprises the following steps: Step 1, digging a rectangular ground trough (100) on the bottom surface, and keeping the excavated soil for later use; prefabricating the steel bars of the base (1) and the retaining wall (2) on the four sides of the bottom of the ground trough (100), and then pouring cement to form an integrated structure of the base (1) and the retaining wall (2); the top surface of the cast retaining wall (2) should be flush with the ground, and the outer side of the retaining wall (2) and the inner wall of the ground trough (100) are filled with soil and compacted; the base trough area is filled with soil and compacted to form a soil layer (5), and the soil layer (5) is flush with the top surface of the base (1); Step 2, neatly stacking the metamaterial bodies into a square body (3), placing the square body (3) on the top surface of the plain soil layer (5), with the four side walls of the square body (3) respectively contacting the inner wall of the retaining wall (2); filling the gaps in the square body (3) with sand, with the sand covering the entire top surface of the square body (3) and compacting it; Step 3, pouring concrete on the top of the sand on the top surface of the square body (3) to form a concrete cushion layer (4) covering the entire top of the sand; Step 4, prefabricating steel bars on the concrete cushion layer (4), and then pouring cement to form a foundation seat (6), the top surface of the poured foundation seat (6) is flush with the ground, and a gap is left between the four surfaces of the foundation seat (6) and the inner side surface of the corresponding retaining wall (2), forming an earthquake-resistant groove (17); placing equipment on the top surface of the foundation seat (6); The square body (3) is formed by stacking metamaterial bodies; The metamaterial body comprises a bottom plate (7), a top plate (8) and four vertical side plates (9); a vertical connecting rod I (10) and a vertical connecting rod II (11) with the same axial direction are respectively arranged at the center of the top surface of the bottom plate (7) and the center of the bottom surface of the top plate (8); a horizontal connecting rod (12) is arranged at the center of the inner side surface of each vertical side plate (9); and the horizontal connecting rods (12) on the opposite vertical side plates (9) have the same axial direction; The top end of the vertical connecting rod I (10) is provided with four oblique connecting rods I (13), each of which is inclined outward and downward; the bottom end of the vertical connecting rod II (11) is provided with four oblique connecting rods II (14), each of which is inclined outward and upward; The ends of each horizontal connecting rod (12) are respectively provided with an oblique connecting rod III (15) and an oblique connecting rod IV (16); the oblique connecting rod III (15) is arranged outwardly and tilted downward, and the end of the oblique connecting rod III (15) is connected to the end of the corresponding oblique connecting rod I (13); the oblique connecting rod IV (16) is arranged outwardly and tilted upward, and the end of the oblique connecting rod IV (16) is connected to the end of the corresponding oblique connecting rod II (14); The preparation method of the metamaterial body is: Making a resin mold corresponding to the shape of the metamaterial body; Mix SYLGARD-184 polydimethylsiloxane and SYLGARD-184 silicone elastomer curing agent in a ratio of 7:1; The mixture is allowed to stand at room temperature for 12 hours, and after the bubbles in the mixed liquid are completely discharged, it is poured into a resin mold and heated for molding; After the metamaterial body is formed, it is cooled and left to stand at room temperature, and the resin mold is removed after it is completely solidified. 2. The construction method of a metamaterial-based equipment foundation base according to claim 1, characterized in that: The specific structure of the square body (3) is as follows: the bottom plate (7) of the metamaterial body located at the top is placed on the top plate (8) of the metamaterial body located at the bottom and is aligned with it; the right vertical side plate (9) of the metamaterial body located at the left is aligned with the left vertical side plate (9) of the metamaterial body at the right and they are in contact with each other; the rear vertical side plate (9) of the metamaterial body located at the front is aligned with the front vertical side plate (9) of the metamaterial body at the rear and they are in contact with each other. 3. A construction method for a metamaterial-based device foundation according to claim 1, characterized in that: The thickness of the concrete cushion layer (4) in step 3 is 80-130 mm.