CN217501672U - Buffer structure member for tunnel body - Google Patents

Abstract

The utility model provides a buffer structure spare for the tunnel body, include: the primary support of the inverted arch is arranged at the bottom of the secondary lining; and the buffer body is arranged between the primary inverted arch support and the secondary lining. The utility model discloses an inside space that contains of buffering body skeleton texture, when the tunnel pucking takes place, the adjustment can take place for the fabric of buffering body, and behaviors such as angular rotation, compression space can take place for cobble or rubble, for reserve deformation space between the invert preliminary bracing of secondary lining, bottom. Further effectively absorb the impact caused by high ground stress, expansive soil, high water pressure and the like, and overcome the problem that the track slab is arched due to the uplift of the inverted arch at the bottom of the tunnel and the cracking of the filling soil.

Description

Buffer structure member for tunnel body

Technical Field

The utility model belongs to the technical field of tunnel engineering, specifically, relate to a buffer structure spare for the tunnel body.

Background

With the rapid development of high-speed railways in China, a large number of ballastless tracks are used. The ballastless track is a track structure which adopts integral foundations such as concrete, asphalt mixture and the like to replace a loose gravel track bed, is also called as a ballastless track, and is an advanced track technology in the world today. Compared with a ballast track, the ballastless track avoids the splashing of the ballast, has good smoothness, good stability, long service life, good durability and less maintenance work, and the running speed of the train can reach more than 350 kilometers.

In the prior art, a ballastless track is laid in a tunnel, generally, after a secondary lining is integrally laid on a rock-soil body of the tunnel, the bottom of the secondary lining is laid flat by using fillers such as concrete, asphalt mixture and the like, and then a track slab is laid.

However, in recent years, railway tunnels built or newly built in China have larger sections, larger buried depths, higher ground stress and more complex geological conditions, partial tunnels are locally raised and arched, and filled concrete, asphalt mixture and the like are cracked to cause the deformation of track slabs, so that the normal operation of ballastless tracks is influenced.

SUMMERY OF THE UTILITY MODEL

To the technical problem as above, the utility model aims at providing a buffer structure spare for the tunnel body, it can effectively prevent to arch on the track board to guarantee track structure's smooth-going complete.

The utility model provides a buffer structure spare for the tunnel body the inboard of the tunnel body is provided with secondary lining, buffer structure spare includes: an inverted arch primary support arranged at the bottom of the secondary lining; and a buffer body arranged between the inverted arch preliminary bracing and the secondary lining.

In one embodiment, the cushion body is filled with pebbles and/or crushed stones.

In one embodiment, the inverted arch primary support is in the shape of a downwardly convex arc.

In one embodiment, an arch wall preliminary support is arranged on the outer side of the secondary lining, and the left end and the right end of the inverted arch preliminary support are connected with the left end and the right end of the arch wall preliminary support.

In one embodiment, a track is arranged inside the tunnel body, and the joints of the inverted arch primary supports and the left and right ends of the arch wall primary supports are lower than the position of the track.

In one embodiment, the buffer body includes last contact surface and lower contact surface, go up the contact surface and be a part of the lateral surface of secondary lining, the contact surface is down the medial surface of inverted arch preliminary bracing, go up the contact surface with the closed connection of lower contact surface.

In one embodiment, the contact surface of the inverted arch preliminary support and the arch wall preliminary support is parallel to the horizontal plane.

In one embodiment, the cross-section of the arch wall preliminary support is greater than the cross-section of the inverted arch preliminary support at the interface of the arch wall preliminary support and the inverted arch preliminary support.

In one embodiment, a plurality of anchor rods are provided on the outside of the primary arch wall support.

In one embodiment, a plurality of anchor rods are uniformly arranged on the outer side of the primary support of the arch wall in a radial shape.

Compared with the prior art, the method has the following advantages.

The utility model discloses a buffer body that is built by cobble or rubble, the buffer body sets up in the secondary lining below. Through setting up like this, the space that can make full use of buffering body self exists, the impact that effectively absorbs high ground stress, inflation soil, high water pressure etc. and cause overcomes tunnel bottom invert arch uplift, fill soil fracture and lead to the problem that the track board upbows.

The utility model discloses in, the buffering body has damping energy dissipation characteristic. The material of the buffer body is broken stone or pebble, the damping ratio of the buffer body is 0.6-1.1, and the damping ratio of the reinforced concrete structure is generally 0.03-0.08. Compared with concrete or reinforced concrete materials, in the process of bottom bulging in the tunnel, the buffer body causes energy dissipation, and the influence of expansion force on the track is reduced.

The utility model discloses in, the buffering body has good bearing characteristic. The content of soft particles and other impurities with saturated water uniaxial compressive strength of less than 20MPa in the buffer body is less than 2%, namely the buffer body has strong vertical rigidity and has a great vertical bearing capacity level, and the safety and the stability of an upper structure can be ensured.

The utility model discloses in, the buffering body is the friction system that slides, under the tunnel pucking effect, can produce relative slip between the inside rubble piece of buffering body, can produce frictional force at the in-process that slides, weakens the energy that transmits superstructure.

The utility model discloses in, the buffering body is particle skeleton texture, and its inside contains the space, and its setting can take place the adjustment between inverted arch preliminary bracing and secondary lining when tunnel pucking takes place at the tunnel bottom, and behaviors such as angular rotation, compression space can take place for cobble or rubble, reserve deformation space between the inverted arch preliminary bracing of secondary lining, bottom. The problem that the track slab is arched due to the fact that an inverted arch at the bottom of the tunnel is raised and filling soil is cracked is solved.

Drawings

The present invention will be described with reference to the accompanying drawings.

Fig. 1 is a schematic view of an embodiment of a cushioning structure for a tunnel body according to the present invention;

fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Structures and corresponding labels shown in the figures: the structure comprises a buffer structure member 100, a secondary lining 1, a track slab 2, an inverted arch primary support 31, a buffer body 32, an upper contact surface 321, a lower contact surface 322, an arch wall primary support 4, an anchor rod 5, a rock-soil body 6 and a filling material 7.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

In the present application, it should be noted that the direction close to the middle hollow portion of the tunnel body according to the present invention is described as "inner" or the like, and the direction away from the middle hollow portion of the tunnel body is described as "outer" or the like.

Fig. 1 shows the structure of a cushioning structure 100 according to the present invention. As shown in fig. 1, the buffering structure member 100 includes a secondary lining 1, an upper contact surface 321, a lower contact surface 322, an arch wall preliminary support 4, an anchor 5, an inverted arch preliminary support 31, and a buffering body 32. The inverted arch preliminary bracing 31 is provided at the outer bottom of the secondary lining 1. The secondary lining 1 is a cast-in-place concrete or reinforced concrete structure. The cushion body 32 has a good ability to absorb deformation, and is provided between the inverted arch preliminary bracing 31 and the secondary lining 1. With this arrangement, when a deformation force is generated on the track plate 2 by high ground stress, expansive soil, high water pressure, or the like, the buffer body 32 can absorb the force by deformation, thereby protecting the upper track plate 2.

According to the present invention, as shown in fig. 1 and 2, the buffer body 32 is formed by wrapping the lower contact surface 322 formed on the upper surface of the inverted arch preliminary bracing 31 and the upper contact surface 321 formed on the lower surface of the outer side portion of the secondary lining 1, and the arch wall preliminary bracing 4 does not participate in the formation of the buffer body. The buffer body 32 is made of pebbles or crushed stones or a combination of the pebbles and the crushed stones filled in the closed space formed by the upper contact surface 321 and the lower contact surface 322. Through the arrangement, a plurality of gaps exist in the buffer body 32, the gaps can effectively absorb deformation caused by high ground stress, expansive soil, high water pressure and the like, the durability and the compressive stability are good, and the restraint of the stratum at the bottom of the tunnel on the secondary lining 1 can be cut off.

In a preferred embodiment, the cushion body 32 is formed by filling and compacting pebbles or crushed stones in layers. The materials of the buffer body should be selected as close as possible in principle. The material source can be Kaishan rock, pebble, etc. The mountain-opening rock block has the characteristics that the raw materials are single, the materials are uniform, the clay and other impurities can be removed by taking effective measures in the processing technology, the cleanliness of a finished product is easy to ensure, the surface of coarse particles of the finished product is a broken surface, the stability is good after laying and rolling, the coarse particles are not easy to be washed away by rainwater and run off, and the like, so that the mountain-opening rock block is a preferred raw material for graded broken stones.

In a preferred embodiment of the present invention, the grain size distribution of the buffer 32 is shown in table 1.

TABLE 1 particle size grading of the buffer

In a preferred embodiment of the present invention, the raw material for the buffer 32 has an acicular index (i.e., the mass percentage of particles having a length 1.8 times larger than the average particle diameter) of not more than 20% and a flaky index (i.e., the mass percentage of particles having a thickness 0.6 times smaller than the average particle diameter) of not more than 20%.

As a preferred embodiment of the present invention, the raw material for the buffer body 32 has a particle content of less than 0.5mm in particle size, and the mass percentage is not more than 0.6%; the mass percentage of the powder with the grain diameter less than 0.063mm is not more than 0.5%.

As a preferred embodiment of the present invention, the content of the fluidized particles and other miscellaneous stones in the buffer body 32 should not be more than 2%.

As a preferred embodiment of the present invention, the raw material for the cushion body 32 should have a content of not more than 2% of the soft particles and other impurities, the water-saturated uniaxial compressive strength of which is less than 20 MPa.

In a preferred embodiment, the damping body 32 is configured in a crescent shape. That is, the inverted arch preliminary bracing 31 is an arc shape that protrudes downward, and may be a concrete or reinforced concrete structure or a steel frame structure according to the surrounding rock conditions and design requirements. By this arrangement, the stress can be dispersed better.

According to the utility model discloses, the lower part and the inverted arch preliminary bracing 31 contact of both ends about arch wall preliminary bracing 4 to the contact surface of arch wall preliminary bracing 4 and inverted arch preliminary bracing 31 constructs to be parallel with the horizontal plane. Through setting up like this, can strengthen tunnel body overall structure's intensity on the one hand. On the other hand, the construction is convenient.

In a preferred embodiment, the contact surface of the arch wall preliminary bracing 4 and the inverted arch preliminary bracing 31 is lower than the position of the track slab 2. That is, the left and right ends of the preliminary arch wall supports 4 extend downward below the plane of the track slab 2, and the entire buffer body 32 is located below the plane of the track slab 2. By this arrangement, on the one hand, the overall structural strength is enhanced. On the other hand, the buffer body 32 is disposed below the track plate 2, which saves materials and sufficiently exerts its buffer function.

In a preferred embodiment, as shown in fig. 1, the cross section of the arch wall preliminary support 4 is larger than that of the inverted arch preliminary support 31 at the contact surface of the arch wall preliminary support 4 with the inverted arch preliminary support 31. Namely, the left and right end parts of the preliminary arch wall support 4 are thickened to form a large arch springing of the preliminary arch wall support. By this arrangement, the arch wall preliminary bracing 4 is reinforced.

In a preferred embodiment, the anchor rod 5 is provided in plurality. A plurality of anchor rods 5 are uniformly arranged in the rock-soil body 6 at the outer side of the arch wall primary support 4 in a radial shape. The anchor rod 5 may be used to add pre-stress. Through the arrangement, the deformation of the tunnel upper arch can be improved to a certain extent after the inverted arch is removed.

According to an embodiment of the present invention, the tunnel body using the buffering structure 100 is constructed as follows.

And excavating and timely constructing the inverted arch primary support 31 in the rock-soil body 6, and filling buffer bodies 32 in layers along the upper contact surface 321 and compacting the inverted arch primary support 31 after construction.

Further, a tunnel is excavated in the rock-soil body 6, and an anchor rod 5 and an arch wall primary support 4 are installed.

The left and right ends of the arch wall preliminary bracing 4 are connected to the left and right ends of the inverted arch preliminary bracing 31.

A plurality of anchor rods 5 are arranged outside the tunnel body and are uniformly arranged on the outer side of the primary support 4 of the arch wall in a radial shape. The anchor rod 5 may be used to add pre-stress. Through the arrangement, the deformation of the tunnel upper arch can be improved to a certain extent after the inverted arch is removed.

The upper contact surface 321 of the cushion body 32 is trimmed so that the upper contact surface 321 can be in close contact with the secondary lining 1. And (3) when the deformation rate of the periphery of the tunnel is obviously reduced and tends to be moderate, constructing the secondary lining 1. The earliest cushion body 32 is designed in the form of a crescent, with which the stresses can be better distributed.

The inner bottom of the secondary lining 1 is paved and leveled by using a filling material 7 such as concrete, asphalt mixture and the like, and then the track slab 2 is paved. The joints of the left and right ends of the inverted arch preliminary bracing 31 and the left and right ends of the arch wall preliminary bracing 4 are lower than the track plate 2.

Further, the joints of the secondary lining 1, the inverted arch preliminary bracing 31, the cushion body 32, and the arch wall preliminary bracing 4 will be described with reference to fig. 1 and 2. The inverted arch primary support 31, the buffer body 32 and the arch wall primary support 4 are in closed connection, and effectively wrap the secondary lining 1. The cross section of the arch wall preliminary bracing 4 is larger than that of the inverted arch preliminary bracing 31. The buffer body 32 contains a gap as a reserved deformation amount of the tunnel bottom drum, so that the secondary lining 1 is effectively protected, and the track slab 2 can be normally operated.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A buffer structure for a tunnel body, the inside of which is provided with a secondary lining (1), characterized in that the buffer structure comprises:

an inverted arch preliminary bracing (31) provided at the bottom of the secondary lining (1), and a buffer body (32) provided between the inverted arch preliminary bracing (31) and the secondary lining (1).

2. The buffer structure for a tunnel body according to claim 1, wherein the buffer body (32) is constructed by gravel or crushed stone filling.

3. The buffer structure for a tunnel according to claim 2, wherein the inverted preliminary support (31) has a downwardly convex arc shape.

4. The buffer structure for a tunnel body according to claim 3, wherein an arch wall preliminary bracing (4) is provided outside the secondary lining (1), and left and right ends of the inverted arch preliminary bracing (31) are connected to left and right ends of the arch wall preliminary bracing (4).

5. The buffer structure for a tunnel body according to claim 4, wherein a track plate (2) is provided inside the tunnel body, and the connection position of the inverted arch preliminary bracing (31) and the arch wall preliminary bracing (4) is lower than the position of the track plate (2).

6. The buffer structure for a tunnel according to claim 5, wherein the buffer body (32) comprises an upper contact surface (321) and a lower contact surface (322), the upper contact surface (321) is a part of an outer side surface of the secondary lining (1), the lower contact surface (322) is an inner side surface of the inverted arch preliminary bracing (31), and the upper contact surface (321) and the lower contact surface (322) are connected in a closed manner.

7. The buffer structure for a tunnel body according to claim 6, wherein the contact surface of the inverted arch preliminary bracing (31) and the arch wall preliminary bracing (4) is parallel to the horizontal plane.

8. The buffer structure for a tunnel body according to claim 7, wherein the cross-section of the arch wall preliminary support (4) is greater than that of the inverted arch preliminary support (31) at the contact surface of the arch wall preliminary support (4) and the inverted arch preliminary support (31).

9. The buffer structure for tunnel according to claim 8, wherein a plurality of anchor rods (5) are provided at the outside of the preliminary arch wall support (4).

10. The buffer structure for tunnel according to claim 9, wherein a plurality of said anchor rods (5) are uniformly arranged radially outside said preliminary arch wall support (4).

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