阅读说明：本技术 一种减轻地铁运行诱发振动的斜桩隔振屏障及其制备方法 (Inclined pile vibration isolation barrier for reducing vibration induced by subway operation and preparation method thereof ) 是由 巴振宁 吴孟桃 鲁世斌 梁建文 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种减轻地铁运行诱发振动的斜桩隔振屏障及其制备方法,斜桩隔振屏障设置在振源与振动受体之间,包括至少一排隔振层,每排隔振层由多个间隔布置的隔振桩组成,每个隔振桩包括预应力混凝土空心管桩和填充在预应力混凝土空心管桩内的填充材料。本发明利用振动波在遇到隔振屏障后发生反射、折射及衍射形成的相位差,有效减小振动波传播能量,进而达到减隔振目的；该屏障结构采用预应力管桩作为套筒,可有效减小施工难度,提高施工效率,同时还可充分发挥预应力管桩自身在受到振动作用后的自恢复特点,提高隔振屏障的强度,增加隔振屏障的使用年限。(The invention discloses an inclined pile vibration isolation barrier for reducing vibration induced by subway operation and a preparation method thereof. According to the vibration isolation barrier, the phase difference formed by reflection, refraction and diffraction of the vibration waves after encountering the vibration isolation barrier is utilized, so that the propagation energy of the vibration waves is effectively reduced, and the aim of vibration isolation reduction is further fulfilled; this protective screen structure adopts the prestressing force tubular pile as the sleeve, can effectively reduce the construction degree of difficulty, improves the efficiency of construction, still can full play prestressing force tubular pile self the self-resuming characteristics after receiving the vibration effect simultaneously, improves the intensity of vibration isolation protective screen, increases the life of vibration isolation protective screen.)

1. The utility model provides a alleviate batter pile vibration isolation protective screen (3) that subway operation induced vibration sets up between vibration source and vibration acceptor, its characterized in that, batter pile vibration isolation protective screen (3) include one row at least vibration isolation layer, every row the vibration isolation layer comprises the vibration isolation stake of a plurality of interval arrangements, every the vibration isolation stake includes prestressed concrete hollow tube stake (7) and fills filling material (6) in prestressed concrete hollow tube stake (7).

2. Batter pile vibration isolation barrier (3) according to claim 1, wherein said filling material (6) is rubber sand consisting of rubber aggregate, coarse aggregate, fine sand, cement and water, wherein the mix ratio of cement, water, fine sand and coarse aggregate is 2: 1: 3: 6, the mass content of the rubber aggregate accounts for 4.5 percent of the total mass of the rubber sand.

3. A batter pile vibration isolation barrier (3) according to claim 2, wherein said rubber aggregate consists of 5 mesh, 8 mesh, 10 mesh and 20 mesh rubber granules, the mass ratio of 5 mesh, 8 mesh, 10 mesh and 20 mesh rubber granules being 4: 7: 6: 2.

4. A batter pile vibration isolation barrier (3) according to claim 1, wherein pre-stressed tendons (8) are provided in the side walls of the pre-stressed concrete hollow pipe piles (7).

5. A batter pile vibration isolation barrier (3) according to claim 1, wherein when said batter pile vibration isolation barrier (3) is provided with more than two rows of vibration isolation layers, the vibration isolation piles of two adjacent rows of vibration isolation layers are arranged in an axial alignment manner.

6. A batter pile vibration isolation barrier (3) according to claim 1, wherein when said batter pile vibration isolation barrier (3) is provided with more than two rows of vibration isolation layers, the vibration isolation piles of two adjacent rows of vibration isolation layers are arranged with axial misalignment.

7. A batter pile vibration isolation barrier (3) according to claim 1, wherein the length of the vibration isolation piles of each vibration isolation layer is gradually reduced from the vibration source to the vibration receptor when said batter pile vibration isolation barrier (3) is provided with more than two rows of vibration isolation layers.

8. A batter pile vibration isolation barrier (3) according to claim 1, wherein the axis of said vibration isolation piles is orthogonal to the line connecting said vibration source and said vibration receptor.

9. A method for preparing rubber sand in a batter pile vibration isolation barrier (3) according to claim 2 or 3, characterized by comprising the following steps:

step 1, blending rubber particles with the particle sizes of 5 meshes, 8 meshes, 10 meshes and 20 meshes into rubber aggregate according to a set proportion;

step 2, preparing a rubber concrete composite modifier into a solution, adding the solution into the rubber aggregate mixed in the step 1, stirring, soaking for a plurality of hours after the rubber aggregate is completely soaked, and drying for later use;

step 3, mixing the coarse aggregate and the rubber aggregate prepared in the step 2, and stirring and scattering rubber particles by utilizing the kneading and squeezing action of stones;

and 4, adding fine aggregate and cement according to a set proportion, stirring, and adding water according to a set proportion after mixing to prepare the rubber sand.

Technical Field

The invention relates to the field of underground traffic engineering, in particular to an inclined connection row pile vibration isolation barrier arranged between a vibration source and a vibration receptor and a preparation method of rubber sand of the inclined connection row pile vibration isolation barrier.

Background

With the rapid development of urban rail transit systems, the characteristics of energy conservation, land conservation, large transportation volume, safety and the like become more and more remarkable. The demand of people for urban rail transit systems in daily life is increased sharply, and meanwhile, the urban rail transit system has many advantages, so that the economy of a service area covered by the urban rail transit system is developed rapidly, and particularly, the urban rail transit mode such as subway is more obvious. However, during high speed operation of a subway, ground vibrations are induced through a series of substructures of the rails, track beds, etc. beneath the subway, while such vibrations are propagated through the medium surrounding the tunnel to adjacent buildings. And as the technology is mature, the requirement of people on the running speed of the subway is increased day by day, but when the speed is increased to a critical value, the resonance phenomenon is generated, which brings great potential safety hazard, and the vibration also necessarily influences the daily production and life of people around. Therefore, it is necessary to research how to solve or reduce the vibration problem.

At present, two main types of solutions to the problem of foundation vibration induced by subway operation exist: one is to adopt the continuous barrier vibration isolation technology, such as setting up the vibration isolation cushion, concrete core wall, etc. around the vibration source, vibration receptor, can also set up the continuous vibration isolation barrier on the propagation path of the wave, namely dig the vibration isolation ditch to realize reducing vibration isolation; the other type adopts a discontinuous barrier vibration isolation technology, and the mode is realized by the modes of multi-purpose arrangement of hole rows, single-row concrete piles, multi-row piles and the like. However, many engineering practices show that the conventional vibration isolation barrier technology has many defects, such as poor stability, high construction difficulty, unobvious vibration isolation effect under the limitation of the prior art, and the like, and still needs to be solved.

Therefore, the vibration isolation mode which is energy-saving, economical, environment-friendly, small in construction difficulty and low in technical requirement is adopted to become an optimal scheme.

Disclosure of Invention

The invention provides an inclined pile vibration isolation barrier for reducing vibration induced by subway operation and a preparation method of rubber sand thereof, aiming at solving the defects of the traditional vibration isolation technology. The barrier structure of the invention effectively reduces the propagation energy of the vibration wave by utilizing the phase difference formed by reflection, refraction and diffraction of the vibration wave after the vibration wave meets the vibration isolation barrier, thereby achieving the aim of vibration isolation reduction. This protective screen structure adopts the prestressing force tubular pile as the sleeve, can effectively reduce the construction degree of difficulty, improves the efficiency of construction, still can full play prestressing force tubular pile self the self-resuming characteristics after receiving the vibration effect simultaneously, improves the intensity of vibration isolation protective screen, increases the life of vibration isolation protective screen.

The technical scheme adopted by the invention is as follows: the utility model provides a alleviate batter pile vibration isolation protective screen that subway operation induced vibration sets up between vibration source and vibration acceptor, batter pile vibration isolation protective screen includes one row at least vibration isolation layer, every row the vibration isolation layer comprises the vibration isolation stake of a plurality of intervals arrangement, every the vibration isolation stake includes prestressed concrete hollow tubular pile and fills filling material in the prestressed concrete hollow tubular pile.

Further, the filling material adopts rubber sand, and the rubber sand is composed of rubber aggregate, coarse aggregate, fine sand, cement and water, wherein the mixing ratio of the cement, the water, the fine sand and the coarse aggregate is 2: 1: 3: 6, the mass content of the rubber aggregate accounts for 4.5 percent of the total mass of the rubber sand.

Further, the rubber aggregate is composed of 5-mesh rubber particles, 8-mesh rubber particles, 10-mesh rubber particles and 20-mesh rubber particles, and the mass ratio of the 5-mesh rubber particles, the 8-mesh rubber particles, the 10-mesh rubber particles and the 20-mesh rubber particles is 4: 7: 6: 2.

Furthermore, a prestressed tendon is arranged in the side wall of the prestressed concrete hollow pipe pile.

Further, when the inclined pile vibration isolation barrier is provided with more than two rows of vibration isolation layers, the vibration isolation piles of two adjacent rows of vibration isolation layers are arranged in an axis righting mode.

Further, when the inclined pile vibration isolation barrier is provided with more than two rows of vibration isolation layers, the vibration isolation piles of two adjacent rows of vibration isolation layers are arranged in a mode of staggered axis.

Further, when the inclined pile vibration isolation barrier is provided with more than two rows of vibration isolation layers, the length of the vibration isolation pile of each vibration isolation layer is gradually reduced from the vibration source to the vibration receptor.

Further, the axis of the vibration isolation pile is orthogonal to the line connecting the vibration source and the vibration receiver.

The other technical scheme adopted by the invention is as follows: a preparation method of the rubber sand in the inclined pile vibration isolation barrier comprises the following steps:

step 1, blending rubber particles with the particle sizes of 5 meshes, 8 meshes, 10 meshes and 20 meshes into rubber aggregate according to a set proportion;

step 2, preparing a rubber concrete composite modifier into a solution, adding the solution into the rubber aggregate mixed in the step 1, stirring, soaking for a plurality of hours after the rubber aggregate is completely soaked, and drying for later use;

step 3, mixing the coarse aggregate and the rubber aggregate prepared in the step 2, and stirring and scattering rubber particles by utilizing the kneading and squeezing action of stones;

and 4, adding fine aggregate and cement according to a set proportion, stirring, and adding water according to a set proportion after mixing to prepare the rubber sand.

The invention has the beneficial effects that:

1. through adopting neotype rubber sand filler material, carry out the packing of prestressed concrete hollow pipe pile, rubber granule is as a filler material between concrete coarse aggregate and fine aggregate fineness modulus, both fine optimization the gradation of rubber sand, because of the characteristics that rubber granule elastic modulus is little itself, proportion is little, has effectively reduced the holistic elastic modulus of vibration isolation row stake again to the horizontal period of self-oscillation of the pile body has been prolonged, vibration damping of vibration isolation system has been improved.

2. The rubber concrete composite modifier is adopted in the process of preparing the rubber concrete, so that the problem of weak bonding interface caused by different material properties of the concrete and the rubber is solved, the compressive strength and the integrity of the material are enhanced, and the workability of the rubber sand is improved.

3. The prestressed concrete pipe pile is used as an external sleeve of the pile body, and the self-recovery characteristic of the prestressed pipe pile is well applied. The self-recovery effect can be achieved no matter the self-recovery pile is used for reflecting or transmitting transmitted waves, and therefore the service life of the pile body is prolonged.

4. The arrangement mode of the piles can adopt various modes, namely single row, double row or multiple rows; even straight line or staggered arrangement all can be fine the connection a plurality of campshed make it become a vibration isolation system, through the refraction, reflection, the transmission consumption vibration energy of incident wave, play the vibration isolation effect. The decreasing pile length also enhances the economy of the invention.

Drawings

FIG. 1: the invention discloses a schematic layout of a batter pile vibration isolation barrier;

FIG. 2 a: the invention discloses a schematic three-dimensional structure of a vibration isolation pile of an inclined pile vibration isolation barrier;

FIG. 2 b: the vibration isolation pile of the oblique pile vibration isolation barrier is a three-dimensional longitudinal section schematic diagram;

FIG. 2 c: the invention discloses a vibration isolation pile three-dimensional cross section schematic diagram of an inclined pile vibration isolation barrier;

FIG. 3 a: the invention adopts a sectional view of a single-row linearly-arranged non-continuous vibration isolation barrier;

FIG. 3 b: the invention adopts a single-row linear arrangement non-continuous vibration isolation barrier plan view;

FIG. 4 a: the invention adopts a section view of a discontinuous vibration isolation barrier in a double-row uniform linear arrangement;

FIG. 4 b: the invention adopts a plan view of a discontinuous vibration isolation barrier which is arranged in a double-row uniform straight line;

FIG. 5 a: the invention adopts a section view of a discontinuous vibration isolation barrier in double-row staggered straight line arrangement;

FIG. 5 b: the invention adopts a plan view of a discontinuous vibration isolation barrier in double-row staggered straight line arrangement;

FIG. 6 a: the invention adopts a section view of a plurality of rows of quincuncial piles arranged on a discontinuous vibration isolation barrier;

FIG. 6 b: the invention adopts a plan view of arranging discontinuous vibration isolation barriers by a plurality of rows of quincuncial piles;

the attached drawings are marked as follows:

1-surface construction affected by vibration; 2-a vibrated building foundation part;

3-inclined pile vibration isolation barrier; 4-soil layer;

5-urban underground traffic train 6-filling material;

7-prestressed concrete hollow pipe pile; 8-prestressed tendons;

d is the diameter of the prestressed concrete hollow pipe pile.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

as shown in fig. 1 to 6b, an inclined pile vibration isolation barrier 3 for reducing vibration induced by subway operation is in the form of a discontinuous vibration isolation barrier. The batter pile vibration isolation barrier 3 is arranged in a soil layer 4 between a vibration source and a vibration receptor, in the embodiment, the vibration source is an urban underground traffic train 5, and the vibration receptor is a ground surface building 1 affected by vibration and a vibration-affected building foundation part 2.

Batter pile vibration isolation barrier 3 includes one row at least vibration isolation layer, every row the vibration isolation layer comprises the vibration isolation stake of a plurality of interval arrangements, every the vibration isolation stake includes prestressed concrete hollow-core pile 7 and fills filling material 6 in the prestressed concrete hollow-core pile 7. The prestressed concrete hollow pipe pile 7 is made of C60 concrete, the filling material 6 is made of novel rubber sand, and a rubber concrete composite modifier is added. When the pile body is vibrated, the deformation of the rubber particles and the friction between the rubber particles and the sand particles are utilized to consume energy, so that the effect of consuming the transmitted vibration energy is achieved.

The rubber sand is filled in the prestressed concrete hollow pipe pile 7 as a filling material 6, as shown in fig. 2a to 2 c. The rubber sand is composed of rubber aggregate, coarse aggregate, fine sand, cement and water, wherein the mixing ratio of the cement to the water to the fine sand to the coarse aggregate is 2: 1: 3: 6, the mass content of the rubber aggregate accounts for 4.5 percent of the total mass of the rubber sand, and the mass proportion of the rubber aggregate is the optimal proportion for exerting the vibration isolation effect of the concrete on the premise of not reducing the material strength of the concrete basically. The rubber aggregate is prepared by selecting 3 to 4 rubber particles with the particle sizes of 5 meshes, 8 meshes, 10 meshes and 20 meshes or 1 mm to 3 mm and 3 mm to 5 mm according to a certain proportion, wherein the fineness modulus of the rubber particles is about 2.5 and is between the fineness modulus of concrete coarse aggregates and concrete fine aggregates, so that the rubber particles become an intermediate medium between the concrete coarse aggregates and the concrete fine aggregates, and the workability of the material is enhanced. In the embodiment, the rubber aggregate is composed of 5-mesh rubber particles, 8-mesh rubber particles, 10-mesh rubber particles and 20-mesh rubber particles, and the mass ratio of the 5-mesh rubber particles, the 8-mesh rubber particles, the 10-mesh rubber particles and the 20-mesh rubber particles is 4: 7: 6: 2. In addition, coarse aggregate in the rubber sand adopts coarse sand with the particle size of 20-40 mm, fine aggregate adopts fine sand with the particle size of 0.35-0.5 mm, and cement adopts ordinary portland cement.

The preparation method of the rubber sand comprises the following steps:

firstly, rubber particles with the particle sizes of 5 meshes, 8 meshes, 10 meshes and 20 meshes (or 3 or 4 rubber particles with the particle sizes of 1 mm-3 mm and 3 mm-5 mm) are selected and blended into the rubber aggregate with the fineness modulus of about 2.5 according to the proportion. The purpose is to ensure that the fineness modulus of the rubber aggregate is between the fineness moduli of coarse aggregates (generally 3.1-3.7) and fine aggregates (1.6-2.2), so that the rubber aggregate is used as a filling material among the aggregates to enhance the integrity of the material.

Secondly, preparing the rubber concrete composite modifier into a solution, adding the solution into the mixed rubber aggregate, stirring, soaking for 18 hours after the rubber aggregate is completely soaked, and drying for later use.

Then, selecting coarse aggregate with the particle size of 20-40 mm, mixing the coarse aggregate with the prepared rubber aggregate, and stirring and scattering the rubber particles by utilizing the kneading and squeezing action of stones.

Finally, adding fine aggregate with the particle size of 0.35-0.5 mm and portland cement according to a set proportion, stirring, adding water according to a set proportion after mixing is finished, and preparing the rubber sand. Wherein, the reference concrete mixing proportion, the mixing proportion of cement, water, fine aggregate and coarse aggregate is 2: 1: 3: 6, the mass ratio of the rubber aggregate is 4.5%.

Tests prove that when the rubber admixture is less than 15%, the influence on the strength of concrete is small, the specific gravity of the concrete is effectively reduced by the aggregate, the binding degree of rubber particles and the aggregate is more excellent by using the modifier, and the problem that the particle bonding interface is weak because the rubber belongs to an organic material and the concrete belongs to an inorganic material is solved.

The invention adopts the prestressed concrete hollow pipe pile 7 as the pipe sleeve of the rubber sand inside. The method comprises the steps of prefabricating the prestressed concrete hollow pipe piles 7 by adopting a pre-tensioning method, wherein eight prestressed tendons 8 (shown in the attached drawing 2 c) are arranged on each prestressed concrete hollow pipe pile 7, the diameter of a pile body is 800 mm, and the length of the pile body is 2.3-2.7 times of Rayleigh wave wavelength. The prefabricated prestressed concrete hollow pipe pile 7 is sent to the site and then positioned and set off according to design requirements, a pile hole is drilled through a crawler-type rotary jet drilling machine, the angle between a drill rod and the ground is adjusted during drilling, the axis of the drilled hole is orthogonal to the line connecting a vibration source and a vibration receptor as much as possible, and after the pile hole is formed, the prefabricated prestressed concrete hollow pipe pile 7 is sent into the pile hole. During pile feeding, the inclination angle of the guide frame and the drilling angle are kept consistent, so that the prestressed concrete hollow pipe pile 7 can be conveniently and smoothly fed into the drilling hole. And after the pile body enters the hole, pouring the prepared rubber sand, and ensuring the compactness of the rubber sand by adopting a layered pouring mode during pouring. And backfilling to level the field after pile filling is finished.

The vibration isolation layer can adopt various row pile arrangement forms, and can adopt single-row linear arrangement, double-row uniform linear arrangement, double-row staggered linear arrangement and multi-row staggered linear arrangement, wherein the uniform linear arrangement is that the axis normal arrangement mode is adopted between the vibration isolation piles of two adjacent rows of vibration isolation layers, and the staggered linear arrangement is that the axis dislocation arrangement mode is adopted between the vibration isolation piles of two adjacent rows of vibration isolation layers. The purpose is to weaken the vibration energy after the vibration wave is refracted or transmitted. When the double-row staggered arrangement or the multi-row staggered arrangement is adopted, the double-row staggered arrangement or the multi-row staggered arrangement can also be arranged in a quincuncial pile form. The alternating mode meets the integrity of the inclined pile vibration isolation barrier 3, reduces the using quantity of piles and saves the cost. When the double-row or multi-row vibration isolation pile barrier is adopted, the shaft distance of the pile body of the adjacent vibration isolation piles in the same row or the adjacent vibration isolation piles in different rows is controlled to be about 4d (wherein d is the diameter of the prestressed concrete hollow pipe pile), the shaft distance cannot be overlarge, so that the vibration isolation effect of the inclined pile vibration isolation barrier 3 is weakened, and the shaft distance cannot be smaller than 2.5d, so that the probability of causing pile group effect is increased. In addition, each row of piles adopts unequal-length piles, because the relative positions of the vibration source and the vibration receptor lead to that the closer to the ground surface the wave propagation path is, the closer to the vibration receptor is, when multiple rows of piles are adopted, the closer to the ground surface the vibration receptor is, the length of the piles can be gradually reduced, as long as the inclined pile vibration isolation barrier 3 can be ensured to be positioned in the wave propagation path range which can enable the ground surface building to be influenced by the vibration of the underground traffic train, so that the manufacturing cost of the inclined pile vibration isolation barrier 3 is reduced, the material utilization rate is maximized, and the economic benefit is increased.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.