CN116145740B - Vibration isolation system and construction technology of building foundation elastic pad along rail transit - Google Patents
Vibration isolation system and construction technology of building foundation elastic pad along rail transit Download PDFInfo
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- CN116145740B CN116145740B CN202310428407.3A CN202310428407A CN116145740B CN 116145740 B CN116145740 B CN 116145740B CN 202310428407 A CN202310428407 A CN 202310428407A CN 116145740 B CN116145740 B CN 116145740B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
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Abstract
The invention relates to the technical field of building vibration reduction, and particularly discloses a vibration isolation system of a building foundation elastic pad along a track traffic line and a construction process, wherein a building foundation bottom elastic pad structure in the system comprises foundation soil, a concrete pad layer, a building foundation bottom waterproof layer, a concrete protection layer I, a building foundation bottom elastic pad, a concrete protection layer II and a building foundation bottom plate; the building underground foundation side wall elastic pad structure comprises a building foundation outer wall, a building foundation side wall waterproof layer, a building foundation side wall elastic pad, a polystyrene board, a protection wall and backfill soil. According to the invention, the elastic pad at the bottom of the building foundation and the elastic pad at the side wall of the building foundation of the building underground foundation form a continuous U-shaped full-wrapping structure, so that the building underground foundation is integrally wrapped by the elastic pad; the 'building concrete outer wall, the building foundation side wall elastic pad and the protection wall' form a 'rigid-flexible-rigid' structure system, and play a role in eliminating or reducing vibration wave conduction and backfill to laterally restrain a building structure.
Description
Technical Field
The invention relates to the technical field of building vibration reduction, in particular to a vibration isolation system of a foundation elastic pad of a building along the track traffic line and a construction process.
Background
In recent years, urban rail transit in China is rapidly developed, and the urban rail transit brings convenience to urban residents, and causes increasingly serious vibration and secondary structural noise pollution to surrounding environments, so that when subway lines pass through sensitive buildings in a short distance or even downwards, the traditional vibration control requirements of vibration sources and vibration isolation measures of vibration transmission ways cannot be fully met, and the vibration and noise reduction control of the buildings is particularly important as a final defense line.
The self vibration and noise reduction control of the building mainly comprises forms of a building foundation elastic pad, an interlayer vibration isolation support, a house in a house, a vibration isolation floor (floor) and the like. The interlayer vibration isolation support is characterized in that a spring vibration isolation support (shown in figure 1) is arranged at the position of an interlayer upright post of a building, an upper building structure floats on the spring, and the purposes of subway vibration and structural noise control are achieved by reducing the vertical natural frequency of the upper building. The house-in-house and vibration isolation floor measures are building local vibration noise control measures which influence the indoor use height (space) of a building room, are cumbersome in construction and cannot perform overall vibration and noise reduction of the building.
The elastic cushion measures of the building foundation are that the elastic cushion vibration reduction material is paved at the bottom of the raft of the building foundation, the whole building structure floats on the elastic cushion, the vibration reduction and noise reduction control effect can be achieved on the whole building, the measures are simple and convenient to construct, and the horizontal earthquake vibration resistance design is not influenced, so that the elastic cushion measures are suitable for all raft foundation building structures. The vibration isolation principle of the measure is based on a 'mass-spring' single-degree-of-freedom vibration isolation system which is formed by a 'building structure and a basic elastic cushion', as shown in fig. 2, k in fig. 2 represents the rigidity of the elastic vibration damping cushion, m represents the building mass, the vertical natural frequency of the 'building structure-elastic cushion' system which is reasonably designed is adjusted by adjusting the rigidity k of the elastic vibration damping cushion (the rigidity of the elastic cushion is reduced as much as possible under the condition of ensuring the limit load), so that the control effect on the vibration and the structural noise of the rail transit environment is achieved, and the construction basic elastic cushion is implemented in a field diagram in fig. 3.
The vibration isolation effect of the elastic vibration damper is generally expressed by the vibration transmissibility, and the calculation formula is as follows:
(1)
wherein:is the transmissibility;Is the damping ratio;For strong excitation frequency of source；Is the natural frequency of the vibration isolation system. FIG. 4 shows the ratio of vibration transmissivity to frequency (f/f 0 ) A graph of the functional relationship between the two, from which it can be seen that the frequency ratio (f/f 0 ) At 1, the vibration transmissivity is maximum, the system resonates, and the frequency ratio (f/f 0 ) Is greater than->When the transmissibility is smaller than 1, the system enters the vibration isolation area, and the larger the frequency ratio is, the smaller the vibration transmissibility is, namely the better the vibration isolation effect is; as can be seen from FIG. 4, when the frequency ratio (f/f 0 ) Less than->The larger the damping ratio, the smaller the vibration isolation transmissibility, and when the frequency ratio (f/f 0 ) Is greater than->When the damping ratio is smaller, the vibration transmissibility is smaller, namely in a vibration isolation area, the vibration isolation effect is inversely proportional to the damping ratio, and in a resonance area, the vibration isolation effect is directly proportional to the damping ratio.
According to the vibration transmissivity calculation formula, under the condition that the external excitation load is fixed, a better vibration isolation effect can be obtained by reducing the natural frequency of the system.
However, because most building structures have underground foundations, the elastic pad is usually positioned between the building structures and the foundation (backfill) soil and is constrained by surrounding soil, the building-elastic pad system is not a truly single free system, the building structures are difficult to realize an overall vertical free motion state, the natural frequency of the vertical design of the building-elastic pad is greatly influenced, meanwhile, the surrounding soil is used as a vibration transmission medium to increase the subway vibration response of the building structures, the larger the foundation burial depth of the building structures is, the larger the vibration control effect loss of the elastic pad is, and the new building foundation burial depth of China is mostly more than 10m, even 30m, and the surrounding soil constraint effect of the surrounding soil of the underground foundation is not negligible.
In the prior practical engineering application, the influence of complex application environment of the elastic cushion building underground foundation is mostly not fully considered, the elastic cushion is only paved on the bottom of a building foundation raft or the underground foundation side wall adjacent to the subway line side, and a real degree of freedom system of the building-elastic cushion in the vertical direction is not really realized, so that the deviation between the actual effect and the theoretical effect of measures is larger.
Disclosure of Invention
In view of the above, the invention provides a vibration isolation system and a construction process for a foundation elastic pad of a building along a track traffic line, and the concrete technical scheme is as follows:
in one aspect, the invention provides a vibration isolation system for a building foundation elastic pad along a track traffic line, which comprises a building foundation bottom elastic pad structure and a building underground foundation side wall elastic pad structure; the elastic cushion structure at the bottom of the building foundation comprises foundation soil, a concrete cushion layer, a waterproof layer at the bottom of the building foundation, a first concrete protection layer, an elastic cushion at the bottom of the building foundation, a second concrete protection layer and a bottom plate of the building foundation from bottom to top; the building underground foundation side wall elastic pad structure comprises a building foundation outer wall, a building foundation side wall waterproof layer, a building foundation side wall elastic pad, polystyrene boards, a protection wall and backfill from inside to outside, wherein the building foundation side wall waterproof layer extends upwards from the building foundation bottom waterproof layer to the stratum surface; the elastic pad on the side wall of the building foundation forms a full package on the underground foundation around the building; the laying range of the elastic cushion at the bottom of the building foundation covers the whole building foundation raft, and the elastic cushion at the bottom of the building foundation and the elastic cushion at the side wall of the building foundation around form a U-shaped continuous vibration isolation layer; the protection wall is calculated and designed according to the lateral static soil pressure and is used for resisting the lateral soil pressure of outside filling soil and eliminating the constraint effect of the lateral elastic pad or the building structure by the lateral soil pressure.
On the other hand, the invention also provides a construction process of the elastic pad vibration isolation system of the building foundation along the track traffic line, which comprises the following steps:
s1, construction of an elastic pad structure at the bottom of a building foundation: the construction sequence is from bottom to top, and sequentially comprises foundation soil, a concrete cushion layer, a waterproof layer at the bottom of a building foundation, a concrete protection layer I, an elastic cushion at the bottom of the building foundation, a concrete protection layer II and a building foundation bottom plate;
s2, construction of an elastic pad structure of the side wall of the building underground foundation: the construction sequence is sequentially laid from inside to outside, and the building foundation outer wall, the building foundation side wall waterproof layer, the building foundation side wall elastic pad, the polystyrene board, the protection wall and backfill soil are sequentially laid.
Aiming at the influence of vibration conduction and constraint effect of surrounding soil of an underground foundation in construction of vibration isolation measures of an elastic pad of a building foundation, the invention provides a fully-wrapped continuous vibration isolation system of the elastic pad of the bottom of the building foundation and the side pad and a protection wall of the periphery of the underground foundation and a construction method thereof. In the invention, the elastic pad at the bottom of the building foundation is still a main vibration isolator, and plays a role in supporting springs in a mass-spring system; the side pads around the underground foundation and the protection wall mainly have two functions, on one hand, the structure form of the protection wall, the elastic pad and the underground foundation of the building has the multi-medium vibration conduction characteristic of rigid-flexible-rigid, and has vibration propagation path vibration isolation function based on a fluctuation theory; on the other hand, the protection wall is designed according to the surrounding soil lateral soil pressure, so that the extrusion action of four surrounding soil on the inner elastic cushion and the building structure is eliminated, and the buffer action of the elastic cushion flexible material can better ensure the vertical free running state of the building-bottom elastic cushion, thereby ensuring the final vibration isolation measure effect.
According to the construction process of the elastic pad vibration isolation system for the building foundation along the track traffic line, preferably, foundation soil is required to meet the design requirements of bearing capacity and foundation deformation of an upper building structure.
According to the construction process of the elastic cushion vibration isolation system for the building foundation along the track traffic line, preferably, the concrete cushion layer has enough rigidity, the thickness is not less than 100mm, the concrete strength grade is not less than C20, and the upper surface of the concrete cushion layer needs to be leveled by mortar.
According to the construction process of the elastic cushion vibration isolation system for the building foundation along the track traffic line, preferably, the thickness of the first concrete protection layer is not less than 50mm, the concrete strength is not less than C20, the first concrete protection layer is used as a working surface of the elastic cushion at the bottom of the building foundation, the upper surface of the first concrete protection layer is free of sharp protrusions, and the unevenness is less than 6mm; the thickness of the second concrete protection layer is 50 mm-100 mm, and the strength grade of the concrete is not less than C20.
According to the construction process of the vibration isolation system for the building foundation elastic pad along the track traffic line, preferably, the laying range of the elastic pad at the bottom of the building foundation should cover the whole building foundation raft; the elastic cushion at the bottom of the building foundation is spliced and tiled by adopting coiled materials or sheets, and the thickness of the elastic cushion is 25 mm-75 mm; the building foundation bottom elastic pad seam should be smooth and straight, and the gap should not be greater than 3mm, and the gap department adopts the waterproof tape that the width is not less than 45mm to seal, after the building foundation bottom elastic pad is laid, cover the PE membrane that the thickness is not less than 0.08 mm.
According to the construction process of the elastic pad vibration isolation system for the building foundation along the track traffic line, preferably, the waterproof layer of the side wall of the building foundation extends upwards from the waterproof layer of the bottom of the building foundation to the surface of a stratum.
According to the construction process of the vibration isolation system of the building foundation elastic pad along the track traffic line, preferably, the side wall elastic pad of the building foundation forms a full package on the underground foundation around the building; the building foundation side wall elastic pad is adhered to the outer side of the building foundation side wall waterproof layer by adopting an adhesive, and the thickness of the building foundation side wall elastic pad is 25 mm-75 mm; the elastic cushion at the bottom of the building foundation and the elastic cushion at the side wall of the building foundation around form a U-shaped continuous vibration isolation layer.
According to the construction process of the vibration isolation system for the building foundation elastic pad along the track traffic line, preferably, the building foundation side wall elastic pad is pasted and paved to the surface of a stratum from the concrete pad layer from bottom to top in a segmented manner, the height of the building foundation side wall elastic pad is not more than 5 meters when the building foundation side wall elastic pad is paved once, and after pasting of the building foundation side wall elastic pad is completed, the outside polyphenyl board and the protection wall should be constructed timely; the building foundation side wall elastic pad edge joint is flat and straight, the gap is not more than 3mm, and the gap is sealed by an adhesive tape with the width not less than 45 mm.
According to the construction process of the vibration isolation system of the building foundation elastic pad along the track traffic line, preferably, a polystyrene board flexible material with the thickness not smaller than 50mm is paved on the outer side of the building foundation side wall elastic pad, the protection wall is built on the outer side of the polystyrene board, the protection wall is calculated and designed according to lateral static soil pressure, and a static soil pressure calculation formula is as follows:
gamma: the volume weight of the surrounding soil medium; k (K) 0 : a side pressure coefficient; h: surrounding soil medium burial depth.
Compared with the prior art, the vibration isolation system and the construction process for the foundation elastic pad of the building along the track traffic line have the following beneficial effects:
1. the protection wall which is subjected to lateral soil pressure design is built on the outer side of the elastic pad of the side wall of the building foundation, so that the protection wall is used for resisting lateral constraint force of backfill soil on a building structure, and meanwhile, polyphenyl plates and elastic pad flexible materials (the elastic pad of the side wall of the building foundation) are filled between the protection wall and the outer wall of the building foundation, so that the vertical free running state of a vibration isolation system of the building-bottom elastic pad can be well ensured, and the vibration isolation theoretical effect of the bottom elastic pad is truly realized.
2. Based on the fluctuation theory, the structural form of the building foundation outer wall, the elastic pad and the protection wall plays a role in vibration conduction and attenuation of a rigid-flexible-rigid multi-medium interface, and the vibration propagation influence of surrounding rock and soil on a building structure is reduced to a certain extent.
3. The elastic cushion at the bottom of the building foundation and the elastic cushion at the side wall of the building foundation around the building underground foundation form a continuous U-shaped continuous vibration isolation layer, so that a more comprehensive vibration isolation effect can be formed on the building structure.
4. The elastic cushion at the bottom of the building foundation is positioned at the inner side of the waterproof layer at the bottom of the building foundation, so that the soaking of underground water can be prevented, and the vibration isolation effect is prevented from being reduced due to the increase of the water absorption rigidity of the elastic material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a layout view of a spring vibration isolation mount.
Fig. 2 is a schematic view of vibration isolation of an elastic pad.
Fig. 3 is a field diagram of a building foundation mat implementation.
FIG. 4 shows the ratio of vibration transmissivity to frequency (f/f) 0 ) A graph of the functional relationship between the two.
Fig. 5 is a schematic structural view of the vibration isolation system for the foundation elastic pad of the building along the track traffic line.
FIG. 6 is a schematic diagram of the lateral static soil pressure distribution of the present invention.
Fig. 7-9 are construction site diagrams of the resilient pad at the bottom of the building foundation of the present invention.
Fig. 10-12 are field diagrams of the laying of resilient pads of the side walls of a building foundation according to the present invention.
In the figure: 1-foundation soil, 2-concrete cushion layers, 3-building foundation bottom waterproof layers, 4-concrete protection layers I, 5-building foundation bottom elastic cushions, 6-concrete protection layers II, 7-building foundation bottom plates, 8-building foundation outer walls, 9-building foundation side wall waterproof layers, 10-building foundation side wall elastic cushions, 11-polystyrene boards, 12-protection walls and 13-backfill soil.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Examples:
as shown in fig. 5, the vibration isolation system for the building foundation elastic pad along the track traffic line comprises a building foundation bottom elastic pad structure and a building underground foundation side wall elastic pad structure.
The elastic cushion structure at the bottom of the building foundation comprises foundation soil 1, a concrete cushion layer 2, a waterproof layer 3 at the bottom of the building foundation, a first concrete protection layer 4, an elastic cushion 5 at the bottom of the building foundation, a second concrete protection layer 6 and a bottom plate 7 of the building foundation from bottom to top; the building underground foundation side wall elastic pad comprises a building foundation outer wall 8, a building foundation side wall waterproof layer 9, a building foundation side wall elastic pad 10, a polystyrene board 11, a protection wall 12 and backfill 13 from inside to outside, wherein the building foundation side wall waterproof layer 9 extends upwards from the building foundation bottom waterproof layer 3 to the stratum surface; the side wall elastic pad 10 of the building foundation forms a full package on the underground foundation around the building; the laying range of the elastic cushion 5 at the bottom of the building foundation covers the whole raft board of the building foundation, and the elastic cushion 5 at the bottom of the building foundation and the elastic cushion 10 at the side wall of the building foundation around form a U-shaped continuous vibration isolation layer; the protective wall 12 is calculated and designed based on the lateral dead-soil pressure to resist the lateral soil pressure of the outside fill, eliminating the lateral spring pad or building structure from being constrained by the lateral soil pressure.
The construction process of the elastic pad vibration isolation system of the building foundation along the track traffic line comprises the following steps:
s1, construction of an elastic pad structure at the bottom of a building foundation: the construction sequence is from bottom to top, and comprises foundation soil 1, a concrete cushion layer 2, a waterproof layer 3 at the bottom of a building foundation, a first concrete protection layer 4, an elastic cushion 5 at the bottom of the building foundation, a second concrete protection layer 6 and a bottom plate 7 of the building foundation;
s2, construction of an elastic pad structure of the side wall of the building underground foundation: the construction sequence is sequentially paved with an outer wall 8 of a building foundation, a waterproof layer 9 of a side wall of the building foundation, an elastic pad 10 of the side wall of the building foundation, a polystyrene board 11, a protection wall 12 and backfill 13 from inside to outside.
Fig. 7 to 9 are construction site diagrams of the bottom elastic pad structure of the building foundation according to the present invention, and are specific to the construction of the bottom elastic pad structure of the building foundation:
foundation soil 1 needs to meet the design requirements of bearing capacity and foundation deformation of an upper building structure;
the concrete cushion layer 2 has enough rigidity, the thickness is not less than 100mm, the strength grade of the concrete is not less than C20, and the upper surface of the concrete cushion layer 2 needs to be subjected to mortar leveling;
the waterproof layer 3 at the bottom of the building foundation is paved on the upper surface of the concrete cushion layer 2, so that the elastic cushion 5 at the bottom of the building foundation can be prevented from being soaked by underground water, and the vibration isolation effect of the elastic cushion 5 at the bottom of the building foundation is prevented from being reduced due to the increase of the water absorption rigidity;
the thickness of the first concrete protection layer 4 is not less than 50mm, the concrete strength is not less than C20, the first concrete protection layer 4 is used for protecting the waterproof layer 3 at the bottom of the building foundation, the first concrete protection layer 4 is used as a working surface of the elastic cushion 5 at the bottom of the building foundation, the upper surface of the first concrete protection layer 4 is free of sharp protrusions, and the unevenness is less than 6mm;
the laying range of the elastic cushion 5 at the bottom of the building foundation covers the whole building foundation raft;
furthermore, the elastic pad 5 at the bottom of the building foundation is spliced and tiled by adopting coiled materials or sheets, and the thickness is preferably 25 mm-75 mm; the edge joint of the elastic cushion 5 at the bottom of the building foundation is flat and straight, the gap is not more than 3mm, the gap is sealed by a waterproof adhesive tape with the width not less than 45mm, and after the elastic cushion 5 at the bottom of the building foundation is paved, a PE film with the thickness not less than 0.08mm is covered, so that the gap of the elastic cushion is prevented from being leaked by mortar, and rigid connection is avoided;
the thickness of the second concrete protection layer 6 is 50 mm-100 mm, the strength grade of the concrete is not less than C20, and the second concrete protection layer 6 is used for preventing the building foundation bottom elastic pad 5 from being punctured and damaged in the building raft pouring construction process.
Fig. 10 to 12 are field diagrams of the construction of the side wall resilient pad structure of the underground foundation of the present invention, and are specific to the construction of the side wall resilient pad structure of the underground foundation of the present invention:
the waterproof layer 9 of the side wall of the building foundation extends upwards from the waterproof layer 3 of the bottom of the building foundation to the surface of the stratum, so that continuous and uninterrupted waterproof protection is formed for the underground of the building structure;
the side wall elastic pad 10 of the building foundation forms a full package on the underground foundation around the building; adhering the building foundation side wall elastic pad 10 to the outer side of the building foundation side wall waterproof layer 9 by adopting an adhesive, wherein the thickness of the building foundation side wall elastic pad 10 is 25 mm-75 mm; the elastic cushion 5 at the bottom of the building foundation and the elastic cushion 10 at the side wall of the building foundation around form a U-shaped continuous vibration isolation layer;
furthermore, in order to avoid the falling of the elastic pad, the side wall elastic pad 10 of the building foundation is pasted and paved to the surface of the stratum from the concrete pad layer 2 from bottom to top in a subsection way, the height of the side wall elastic pad 10 of the building foundation is not more than 5 meters when being paved once, and after the pasting of the side wall elastic pad 10 of the building foundation is completed, the masonry construction of the outer polystyrene board 11 and the protection wall 12 should be carried out in time; the edge joint of the elastic pad 10 of the side wall of the building foundation is flat and straight, the gap is not more than 3mm, and the gap is sealed by an adhesive tape with the width not less than 45 mm;
the outside of the elastic pad 10 of the side wall of the building foundation is paved with a polyphenyl board flexible material with the thickness not less than 50mm, the elastic pad of the side wall is protected from piercing and damaging, the outside of the polyphenyl board 11 is built with a protection wall 12, the protection wall 12 is used for resisting the lateral soil pressure of outside filling soil, the lateral soil pressure restraining effect of the lateral elasticity is eliminated, the protection wall 12 is calculated and designed according to the lateral soil pressure, and the lateral soil pressure distribution schematic diagram is shown in fig. 6;
the calculation formula of the static soil pressure is as follows:
gamma: the volume weight of the surrounding soil medium; k (K) 0 : a side pressure coefficient; h: surrounding soil medium burial depth.
In the construction process of the invention, the water-soluble polyurethane foam is prepared,
(1) The elastic pad at the bottom of the building foundation and the elastic pad at the side wall of the building foundation of the building underground foundation form a continuous U-shaped full-wrapping structure, so that the building underground foundation is wrapped by the elastic pad integrally;
(2) The outer side of the elastic pad of the side wall of the building foundation is built with a protection wall designed by lateral soil pressure, so that lateral surrounding soil is ensured to form lateral soil pressure on the elastic pad or the building structure, and the free movement state of the building structure in the vertical direction is ensured;
(3) The 'building concrete outer wall, the building foundation side wall elastic pad and the protection wall' form a 'rigid-flexible-rigid' structure system, and play roles in eliminating or reducing vibration wave conduction and lateral constraint of backfill soil on a building structure;
(4) The elastic cushion at the bottom of the building foundation is positioned at the inner side of the waterproof layer at the bottom of the building foundation, so that the vibration isolation effect is prevented from being reduced due to the increase of the soaking rigidity of the elastic cushion at the bottom;
(5) The edge joint between the elastic pad at the bottom of the building foundation and the elastic pad at the side wall of the building foundation is sealed tightly, so that the sound bridge effect generated by local rigid connection is avoided.
The invention aims at the conventional project of reserving a fertilizer tank, firstly, building a building structure body, and then, taking the outer wall of the building structure as a working surface for subsequent implementation of a waterproof layer and a vibration isolation layer of the building structure body, in order to avoid the extrusion effect of the fertilizer tank landfill on the vibration isolation layer, building a protection wall with the retaining wall effect outside the vibration isolation layer, and then, carrying out the soil filling landfill on the fertilizer tank between the protection wall and a foundation pit supporting structure. The protection wall is mainly used for resisting the extrusion action of peripheral backfill soil and has mechanical design requirements. And by applying the system structure of the invention, the maximization of the vibration isolation effect is realized as much as possible.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The vibration isolation system for the elastic cushion of the building foundation along the track traffic line is characterized by comprising an elastic cushion structure at the bottom of the building foundation and an elastic cushion structure on the side wall of the building underground foundation aiming at the conventional project of reserving a fertilizer groove; the elastic cushion structure at the bottom of the building foundation comprises foundation soil, a concrete cushion layer, a waterproof layer at the bottom of the building foundation, a first concrete protection layer, an elastic cushion at the bottom of the building foundation, a second concrete protection layer and a bottom plate of the building foundation from bottom to top; the building underground foundation side wall elastic pad structure comprises a building foundation outer wall, a building foundation side wall waterproof layer, a building foundation side wall elastic pad, polystyrene boards, a protection wall and backfill from inside to outside, wherein the building foundation side wall waterproof layer extends upwards from the building foundation bottom waterproof layer to the stratum surface; the elastic pad on the side wall of the building foundation forms a full package on the underground foundation around the building; the laying range of the elastic cushion at the bottom of the building foundation covers the whole building foundation raft, and the elastic cushion at the bottom of the building foundation and the elastic cushion at the side wall of the building foundation around form a U-shaped continuous vibration isolation layer; the protection wall is calculated and designed according to the lateral static soil pressure and is used for resisting the lateral soil pressure of outside filled soil and eliminating the constraint effect of the lateral elastic pad or the building structure by the lateral soil pressure;
the protection wall is calculated and designed according to lateral static soil pressure, and the static soil pressure calculation formula is as follows:
gamma: the volume weight of the surrounding soil medium; k (K) 0 : a side pressure coefficient; h: surrounding soil medium burial depth;
the construction process of the elastic pad vibration isolation system of the building foundation along the track traffic line comprises the following steps:
s1, construction of an elastic pad structure at the bottom of a building foundation: the construction sequence is from bottom to top, and sequentially comprises foundation soil, a concrete cushion layer, a waterproof layer at the bottom of a building foundation, a concrete protection layer I, an elastic cushion at the bottom of the building foundation, a concrete protection layer II and a building foundation bottom plate;
s2, construction of an elastic pad structure of the side wall of the building underground foundation: sequentially paving a building foundation outer wall, a building foundation side wall waterproof layer, a building foundation side wall elastic pad, a polystyrene board, a protection wall and backfill soil from inside to outside in the construction sequence; and after the pasting of the elastic pad on the side wall of the building foundation is completed, timely performing the masonry construction of the polystyrene board and the protection wall on the outer side.
2. The system of claim 1, wherein the foundation soil is required to meet the load bearing capacity and foundation deformation design requirements of the superstructure.
3. The vibration isolation system of the foundation elastic pad for track traffic along the building according to claim 2, wherein the concrete pad should have sufficient rigidity, the thickness is not less than 100mm, the concrete strength grade is not less than C20, and the upper surface of the concrete pad needs to be mortar leveled.
4. The vibration isolation system for the foundation elastic pad of the track traffic line building according to claim 3, wherein the thickness of the first concrete protection layer is not less than 50mm, the concrete strength is not less than C20, the first concrete protection layer is used as a working surface of the foundation elastic pad of the building foundation, the upper surface of the first concrete protection layer is free of sharp protrusions, and the unevenness is less than 6mm; the thickness of the second concrete protection layer is 50 mm-100 mm, and the strength grade of the concrete is not less than C20.
5. The vibration isolation system for the foundation elastic pad of the track traffic line building according to claim 4, wherein the laying range of the foundation elastic pad of the building foundation is covered by the whole foundation raft; the elastic cushion at the bottom of the building foundation is spliced and tiled by adopting coiled materials or sheets, and the thickness of the elastic cushion is 25 mm-75 mm; the building foundation bottom elastic pad seam should be smooth and straight, and the gap should not be greater than 3mm, and the gap department adopts the waterproof tape that the width is not less than 45mm to seal, after the building foundation bottom elastic pad is laid, cover the PE membrane that the thickness is not less than 0.08 mm.
6. The elastomeric pad vibration isolation system of claim 1, wherein said foundation sidewall waterproof layer extends upwardly from said foundation bottom waterproof layer to the surface of the ground.
7. The vibration isolation system of the elastic cushion for the building foundation along the track traffic line according to claim 6, wherein the elastic cushion for the side wall of the building foundation is adhered to the outer side of the waterproof layer of the side wall of the building foundation by using an adhesive, and the thickness of the elastic cushion for the side wall of the building foundation is 25 mm-75 mm.
8. The vibration isolation system of the elastic cushion for the building foundation along the track traffic line according to claim 7, wherein the elastic cushion for the side wall of the building foundation is pasted and paved on the surface of the stratum from the concrete cushion layer from bottom to top in a segmented manner, and the height of the elastic cushion for the side wall of the building foundation is not more than 5 meters when paved at one time; the building foundation side wall elastic pad edge joint is flat and straight, the gap is not more than 3mm, and the gap is sealed by an adhesive tape with the width not less than 45 mm.
9. The vibration isolation system of the elastic cushion for the building foundation along the track traffic line according to claim 8, wherein the outer side of the elastic cushion for the side wall of the building foundation is paved with a polystyrene board flexible material with the thickness not less than 50mm, and the outer side of the polystyrene board is used for building the protection wall.
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| CN104196059B (en) * | 2014-09-22 | 2016-08-03 | 北京宝曼科技有限公司 | Building foundation vibration isolation system |
| CN109930631B (en) * | 2019-04-10 | 2024-03-08 | 北京市劳动保护科学研究所 | Vibration isolation structure of building foundation and construction method thereof |
| CN112523579B (en) * | 2020-12-09 | 2021-09-10 | 北京建筑大学 | Underground structure toughness anti-seismic system with additional damper and shock insulation support |
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| CN216999885U (en) * | 2022-01-26 | 2022-07-19 | 北京市科学技术研究院城市安全与环境科学研究所 | Vibration isolation system for building foundation |
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