阅读说明：本技术 一种减振型盾构管片接头结构及盾构管片减振方法 (Vibration reduction type shield segment joint structure and shield segment vibration reduction method ) 是由 金浩 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种减振型盾构管片接头结构及盾构管片减振方法,盾构管片接头包括密封垫,设置在两块相邻管片接缝处,用于密封和防水作用；还包括耗能垫,设置在所述密封垫与管片之间,为条状弹性体,所述耗能垫的一侧与所述密封垫紧密贴合,另一侧与所述管片紧密贴合；条状耗能单元,一端插入管片的混凝土内部,另一端与所述耗能垫固定连接。本发明一种减振型盾构管片接头结构,在其接头处设计减振构造,使管片拼装之后具有衰减列车运行产生的振动的效果,同时,防止其长期振动开裂,保证了隧道结构的耐久性、安全性。(The invention discloses a vibration reduction type shield segment joint structure and a shield segment vibration reduction method, wherein the shield segment joint comprises a sealing gasket which is arranged at the joint of two adjacent segments and used for sealing and waterproofing; the energy-consuming gasket is arranged between the sealing gasket and the duct piece and is a strip-shaped elastic body, one side of the energy-consuming gasket is tightly attached to the sealing gasket, and the other side of the energy-consuming gasket is tightly attached to the duct piece; and one end of the strip energy dissipation unit is inserted into the concrete of the duct piece, and the other end of the strip energy dissipation unit is fixedly connected with the energy dissipation pad. According to the vibration reduction type shield segment joint structure, the vibration reduction structure is designed at the joint, so that the segment has the effect of reducing vibration generated by train operation after being assembled, meanwhile, the segment is prevented from cracking due to long-term vibration, and the durability and the safety of a tunnel structure are ensured.)

1. A vibration damping shield segment joint structure comprising:

the sealing gasket is arranged at the joint of two adjacent segments and used for sealing and waterproofing;

it is characterized by also comprising:

the energy dissipation pad is arranged between the sealing pad and the duct piece and is a strip-shaped elastic body, one side of the energy dissipation pad is tightly attached to the sealing pad, and the other side of the energy dissipation pad is tightly attached to the duct piece;

and one end of the strip energy dissipation unit is inserted into the concrete of the duct piece, and the other end of the strip energy dissipation unit is fixedly connected with the energy dissipation pad.

2. The vibration damping type shield segment joint structure according to claim 1, wherein the energy dissipation pad is made of modified rubber reinforced by montmorillonite and carbon black.

3. The vibration damping type shield segment joint structure according to claim 1, wherein the plurality of energy dissipation units are arranged at equal intervals along the length direction of the energy dissipation pad on the side of the energy dissipation pad adjacent to the segment.

4. The vibration damping type shield segment joint structure according to claim 3, wherein the material of the strip-shaped energy dissipation units is modified rubber reinforced by montmorillonite and carbon black.

5. The vibration damping type shield segment joint structure according to claim 1, wherein the gasket is located in a gasket groove preset in the segment and is tightly attached to the segment, the cross section of the gasket is trapezoidal, the upper bottom of the energy dissipation gasket is consistent with the lower bottom of the gasket, and the upper surface of the energy dissipation gasket is tightly attached to the lower surface of the gasket; the lower surface of the energy dissipation pad is tightly attached to the bottom of the groove of the sealing pad, and strip-shaped energy dissipation units are arranged and inserted into the duct piece;

the sealing gasket material is ethylene propylene diene monomer, the cross section of the sealing gasket is of a porous structure, and the cross section area is A₁The following equation is satisfied:

，

wherein A is₁Is the cross-sectional area of the gasket, A₂The cross-sectional area of the groove of the sealing gasket on the surface of the pipe piece is shown.

6. The vibration damping type shield segment joint structure according to claim 1, wherein the contact surfaces of two adjacent segments are coated with energy dissipation coatings made of damping energy dissipation materials.

7. The vibration damping type shield segment joint structure according to claim 1, wherein the damping energy dissipation material is a polyurea material.

8. The vibration damping type shield segment joint structure according to claim 1, wherein a circular seam hand hole and a longitudinal seam hand hole are respectively formed in the inner arc surface of the segment, and the circular seam hand hole provides an operation space for anchoring a circular seam bolt between two segments; the longitudinal joint hand hole provides an operation space for anchoring a longitudinal joint bolt between two pipe pieces;

the bottom of the circular seam hand hole is communicated with a circular seam bolt hole which is of an arc cavity structure and provides a space for the penetration of a circular seam bolt between two circular duct pieces, one end of the circular seam bolt hole is connected with the circular seam hand hole, and the other end of the circular seam bolt hole penetrates through the surfaces of the duct pieces;

the hole bottom of the longitudinal joint hand hole is communicated with the longitudinal joint bolt hole, the longitudinal joint bolt hole is of an arc-shaped cavity structure and provides a space for penetration of the longitudinal joint bolt between the two segments, one end of the longitudinal joint bolt hole is connected with the longitudinal joint hand hole, and the other end of the longitudinal joint bolt hole penetrates through the surface of the segment.

9. A vibration reduction method for a shield segment adopts the vibration reduction type shield segment joint structure as claimed in any one of claims 1 to 8, and is characterized in that vibration waves generated by train operation are transmitted to the surface and the interior of the segment from rail structures such as steel rails and ballast beds;

the strip energy dissipation unit inserted into the duct piece dissipates energy through high damping characteristic of the energy dissipation unit, and attenuates the vibration waves transmitted to the inside of the duct piece;

the energy dissipation coating coated on the outer surface of the duct piece attenuates the vibration waves transmitted to the surface of the duct piece through self damping energy dissipation;

the energy dissipation pad connected with the strip-shaped energy dissipation unit is located at the connecting part between the two pipe pieces, and plays a role in attenuating the transmission of vibration waves between the two pipe pieces through the self height damping characteristic.

Technical Field

The invention relates to the field of vibration reduction of a rail transit tunnel structure, in particular to a vibration reduction type shield segment joint structure and a shield segment vibration reduction method.

Background

With the continuous promotion of urban rail transit construction, the problem of environmental vibration generated by rail transit operation is increasingly prominent. Under the cyclic reciprocating action of train load, the peripheral track structure such as a tunnel can be influenced by vibration, and under the long-term water and soil load and vibration action, the problem that the service performance is influenced by cracking and the like can occur. The vibration is propagated to the earth's surface through the outer soil body in tunnel, also can cause adverse effect to track traffic ancient building and resident's life experience along the line, consequently is necessary to take damping measure to the track traffic structure.

The existing vibration reduction measures mainly include methods of changing a track structure type, replacing an elastic track part and the like, a certain vibration reduction effect is achieved, but the problems of high replacement cost, large construction influence, influence on train operation clearance and the like exist.

Disclosure of Invention

The invention aims to provide a vibration reduction type shield segment joint structure and a shield segment vibration reduction method.

The purpose of the invention can be realized by the following technical scheme:

a vibration damping shield segment joint structure comprising:

the sealing gasket is arranged at the joint of two adjacent segments and used for sealing and waterproofing;

further comprising:

the energy dissipation pad is arranged between the sealing pad and the duct piece and is a strip-shaped elastic body, one side of the energy dissipation pad is tightly attached to the sealing pad, and the other side of the energy dissipation pad is tightly attached to the duct piece;

and one end of the strip energy dissipation unit is inserted into the concrete of the duct piece, and the other end of the strip energy dissipation unit is fixedly connected with the energy dissipation pad.

The energy dissipation pad is made of modified rubber reinforced by montmorillonite and carbon black.

The strip energy dissipation units comprise a plurality of strip energy dissipation units, and the plurality of strip energy dissipation units are arranged on one side, close to the duct piece, of the energy dissipation pad at equal intervals along the length direction of the energy dissipation pad.

The strip-shaped energy consumption unit is made of modified rubber reinforced by montmorillonite and carbon black.

The energy dissipation gasket is positioned in a gasket groove preset on the duct piece and is tightly attached to the duct piece, the cross section of the gasket is trapezoidal, the upper bottom of the energy dissipation gasket is consistent with the lower bottom of the gasket, and the upper surface of the energy dissipation gasket is tightly attached to the lower surface of the gasket; the lower surface of the energy dissipation pad is tightly attached to the bottom of the groove of the sealing pad, and strip-shaped energy dissipation units are arranged and inserted into the duct piece;

the sealing gasket material is ethylene propylene diene monomer, the cross section of the sealing gasket is of a porous structure, and the cross section area is A₁The following equation is satisfied:

wherein A is₁Is the cross-sectional area of the gasket, A₂The cross-sectional area of the groove of the sealing gasket on the surface of the pipe piece is shown.

The contact surfaces of two adjacent pipe pieces are coated with energy dissipation coatings made of damping energy dissipation materials.

The damping energy dissipation material is a polyurea material.

Circular seam hand holes and longitudinal seam hand holes are respectively formed in the inner arc surfaces of the duct pieces, and the circular seam hand holes provide an operation space for anchoring circular seam bolts between the two duct pieces; the longitudinal joint hand hole provides an operation space for anchoring a longitudinal joint bolt between two pipe pieces;

the bottom of the circular seam hand hole is communicated with a circular seam bolt hole which is of an arc cavity structure and provides a space for the penetration of a circular seam bolt between two circular duct pieces, one end of the circular seam bolt hole is connected with the circular seam hand hole, and the other end of the circular seam bolt hole penetrates through the surfaces of the duct pieces;

the bottom of the longitudinal joint hand hole is communicated with a longitudinal joint bolt hole, the longitudinal joint bolt hole is of an arc-shaped cavity structure and provides a space for penetration of a longitudinal joint bolt between two pipe pieces, one end of the longitudinal joint bolt hole is connected with the longitudinal joint hand hole, and the other end of the longitudinal joint bolt hole penetrates through the surfaces of the pipe pieces;

the invention further discloses a vibration reduction method for the shield segment, wherein by adopting the vibration reduction type shield segment joint structure, vibration waves generated by the running of a train are transmitted to the surface and the inside of the segment from rail structures such as steel rails, track beds and the like;

the strip energy dissipation unit inserted into the duct piece dissipates energy through high damping characteristic of the energy dissipation unit, and attenuates the vibration waves transmitted to the inside of the duct piece;

the energy dissipation coating coated on the outer surface of the duct piece attenuates the vibration waves transmitted to the surface of the duct piece through self damping energy dissipation;

the energy dissipation pad connected with the strip-shaped energy dissipation unit is located at the connecting part between the two pipe pieces, and plays a role in attenuating the transmission of vibration waves between the two pipe pieces through the self height damping characteristic.

Has the advantages that:

compared with the prior art, the invention designs the vibration type segment joint structure by combining the structural characteristics of the assembled shield tunnel, and the invention has the beneficial effects that:

firstly, a vibration damping structure is designed in the process of factory prefabrication of the duct piece, an energy dissipation pad is arranged between the sealing pad and the duct piece, meanwhile, a strip-shaped energy dissipation unit embedded into the concrete is arranged on one side, close to the concrete, of the energy dissipation pad, the strip-shaped energy dissipation unit can enable the energy dissipation pad to be more tightly bonded with the concrete under the vibration damping and energy dissipation effects, and the vibration damping and energy dissipation device has the functions of blocking and dissipating energy for transmission of vibration between the duct pieces.

And secondly, energy dissipation coatings made of damping energy dissipation materials are coated on the contact surfaces of two adjacent pipe pieces, so that the durability of the concrete pipe pieces can be improved while the vibration and energy dissipation effects are further improved.

Drawings

FIG. 1 is a schematic view of a vibrating segment joint configuration of the present invention;

FIG. 2 is a schematic view of the pad and the strip-shaped energy dissipation unit of the present invention;

fig. 3 is a schematic view of gasket construction according to the present invention.

FIG. 4 is a schematic view of the energy dissipating coating application of the present invention.

FIG. 5 is a flow chart of the duct piece construction organization of the present invention.

The energy-saving pipe comprises a pipe piece 1, a circular seam hand hole 2, a circular seam bolt hole 3, a longitudinal seam hand hole 4, a longitudinal seam bolt hole 5, a sealing gasket 6, an energy-consuming pad 7, a strip-shaped energy-consuming unit 8 and an energy-consuming coating 9.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1:

this embodiment is a damping bolt external member for subway section of jurisdiction. The outside diameter of segment 1 is 6.7m, and the internal diameter is 5.9m, segment thickness 350 mm.

FIG. 1 is a schematic view of a vibration-damping shield segment joint structure according to the present invention, wherein the segment body is made of steel barsConcrete structure, generally designated C50, having a modulus of elasticity of 3.45X 10⁴MPa, Poisson's ratio of 0.2, density of 2420kg/m³。

The circular seam bolt hole 3 and the longitudinal seam bolt hole 5 are positioned in the duct piece 1 and are of arc-shaped cavity structures, and the aperture is 42 mm. The wall thickness is 3mm, the material is high-strength plastic, and the outer side of the high-strength plastic is directly contacted with concrete in the duct piece.

The sealing gasket 6 is positioned at the joint of two adjacent pipe pieces, has sealing and waterproof functions, is positioned in a sealing gasket groove preset in the pipe piece 1, is tightly attached to the pipe piece and is made of ethylene propylene diene monomer. The cross section is a porous structure.

The energy dissipation pad 7 is arranged on the inner side of the sealing pad 6 and is a strip-shaped elastic body, the cross section of the energy dissipation pad is trapezoidal, the height of the energy dissipation pad is 5mm, the upper bottom of the energy dissipation pad is consistent with the lower bottom of the sealing pad, and the upper surface of the energy dissipation pad is tightly attached to the lower surface of the sealing pad. The lower surface of the energy dissipation pad is tightly attached to the duct piece 1, and strip energy dissipation units 8 are arranged and inserted into the duct piece 1. The material is an anti-aging high-damping material, such as modified rubber reinforced by montmorillonite and carbon black.

The strip-shaped energy consumption units 8 are strip-shaped elastic bodies, the side length of the cross section is 10mm, one end of each strip-shaped energy consumption unit extends into concrete, the length of each strip-shaped energy consumption unit is 50mm, the other end of each strip-shaped energy consumption unit is connected with the strip-shaped energy consumption units 8, the strip-shaped energy consumption units are arranged on the bottom surfaces of the strip-shaped energy consumption units at equal intervals, the intervals are 100mm, and the strip-shaped energy consumption units are made of anti-aging high-damping materials, such as modified rubber reinforced by montmorillonite and carbon black. The energy dissipation pad 7 can be bonded with the concrete more tightly while the vibration and energy dissipation function is achieved.

The energy dissipation coating 9 is a damping energy dissipation material, is coated on the contact surface of the duct piece in the prefabrication process of the duct piece 1, is a polyurea material, and has the coating thickness of 0.5 mm. The concrete pipe piece can be durable while the vibration and energy consumption reduction effect is achieved.

Fig. 2 is a schematic view showing the construction of the gasket according to the present invention, in which the gasket is embedded in a mold.

As shown in fig. 3, the energy consumption pad and the energy consumption unit bar are embedded after the sealing pad is embedded in the mold.

Fig. 4 is a schematic diagram of the energy dissipation coating construction of the present invention. After the concrete is poured, the contact surface of the pipe piece is coated with a high-damping polyurea material.

Fig. 5 is a flow chart of duct piece construction organization according to the present invention, and the vibration-damping duct pieces can be prefabricated in a factory according to the flow chart.

A vibration reduction method for shield segments is characterized in that vibration waves generated by train operation are transmitted to the surfaces and the inner parts of the segments from rail structures such as steel rails and ballast beds by adopting the vibration reduction type shield segment joint structure;

the strip energy dissipation unit inserted into the duct piece dissipates energy through high damping characteristic of the energy dissipation unit, and attenuates the vibration waves transmitted to the inside of the duct piece;

the energy dissipation coating coated on the outer surface of the duct piece attenuates the vibration waves transmitted to the surface of the duct piece through self damping energy dissipation;

the energy dissipation pad connected with the strip-shaped energy dissipation unit is located at the connecting part between the two pipe pieces, and plays a role in attenuating the transmission of vibration waves between the two pipe pieces through the self height damping characteristic.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.