A bidirectional sliding device for a central column of an underground structure and its application

Abstract

The present invention discloses a bidirectional sliding device for a central column of an underground structure and its application, comprising a core slider, the upper and lower surfaces of which are respectively provided with arc-shaped concave sliding surfaces, and the two concave sliding surfaces are provided in directions orthogonal to each other; two fixed blocks, which are respectively located at the upper and lower ends of the core slider, and the sides facing the core slider are both convex sliding surfaces matching the concave sliding surfaces of the core slider; a plurality of rolling rods, which are located between the core slider and the two fixed blocks, so that rolling contact is formed between the core slider and the two fixed blocks; and a plurality of supporting rods, which are used to form a weak connection between the core slider and the two fixed blocks. During an earthquake, the core slider can slide between the upper and lower fixed blocks, so that the relative deformation between the layers of the underground subway station structure is not directly applied to the central column, that is, the central column has an unchanged vertical bearing capacity while the horizontal deformation is effectively reduced, thereby ensuring the safety performance of the key supporting components of the underground structure during an earthquake, and greatly reducing the possible damage to the underground structure during an earthquake.

Description

Technical Field

[0001] The invention relates to the field of construction of underground structure engineering, and in particular to a bidirectional sliding device for a central column of an underground structure and its application. Background Art

[0002] In recent years, with the continuous advancement of urbanization in countries around the world, domestic and foreign scholars have gradually realized that the development and utilization of underground space will become an important development direction. Underground structures have been increasingly widely used in various fields such as urban construction, transportation, national defense engineering, water conservancy engineering, etc., such as railway tunnels, subway projects, underground shopping malls, air defense projects, etc. Practice has shown that the 21st century is the century of underground space development and utilization, and the development of underground space and the construction of underground structures have entered a peak period of rapid development worldwide.

[0003] In the field of urban transportation, the high-capacity rapid public transportation system with subway engineering as the backbone plays an indispensable role in solving urban transportation problems. Although the development of underground engineering is booming, it also faces challenges - the role of earthquakes. In particular, the 7.2-magnitude Hanshin earthquake in Japan in 1995 caused the most serious damage to the underground structure in Kobe City in history. A large number of underground projects such as subways, underground parking lots, underground tunnels and underground commercial streets were severely damaged. Among them, the most notable is the damage to subway stations. A total of 5 subway stations and about 3km of subway tunnels were damaged in the earthquake. Among them, the damage to the Dakai subway station was the most serious. More than half of the central columns collapsed completely, resulting in the collapse of the roof and the settlement of the overlying soil layer. The maximum settlement was as much as 2.5m.

[0004] Related studies have shown that the vertical vibration caused by earthquakes may be a key factor leading to the destruction of underground structures. In particular, for shallow underground structures, the overlying soil may be sheared in the initial stage of earthquake action, and it is no longer a continuous whole with other soils around the underground structure. In the subsequent earthquake response, the role of these overlying soils is only to accumulate on the top plate of the underground structure and form a weak connection with the surrounding soil (similar to backfill soil). Therefore, the constraint effect and seismic response effect on the underground structure are completely different from those of continuous soil. However, the vertical inertial force of the overlying soil will have a great impact on the vertical force evaluation of the key supporting components of the underground structure, which actually changes the axial compression ratio of the supporting column, thereby changing the shear strength and deformation performance of the supporting column. For the seismic response of the underground structure, it is unfavorable for the supporting column to increase its shear strength and reduce its ultimate deformation capacity, which means that the supporting column will share more horizontal shear force acting on the underground structure due to soil deformation. At the same time, the reduction of its ultimate deformation capacity may cause it to be destroyed before the side wall, which will lead to the overall destruction of the top plate and the underground structure system. Therefore, how to solve or reduce the damage caused by earthquakes to underground structures and improve the earthquake resistance of underground structures and buildings has become an urgent problem to be solved. Summary of the invention

[0005] In view of the above problems, the present invention provides a bidirectional sliding device for the column in the underground structure and its application based on the earthquake damage characteristics and the damage mechanism of the underground structure, so as to replace the ordinary integrally consolidated beam-column nodes in the traditional underground structure, thereby ensuring the safety performance of the key supporting components of the underground structure during the earthquake and greatly reducing the possible damage to the underground structure during the earthquake. The specific technical scheme is as follows:

[0006] The present invention provides a bidirectional sliding device for a central column of an underground structure, comprising a core slider having arc-shaped concave sliding surfaces on its upper and lower surfaces, respectively, and the two concave sliding surfaces are arranged in directions that are orthogonal to each other; two fixed blocks, respectively located at the upper and lower ends of the core slider, and each of the sides facing the core slider is a convex sliding surface that matches the concave sliding surface of the core slider; a plurality of rolling rods, which are located between the core slider and the two fixed blocks so that rolling contact is formed between the core slider and the two fixed blocks; and a plurality of support rods, which are used to form a weak connection between the core slider and the two fixed blocks.

[0007] The aforementioned bidirectional sliding device for the central column of the underground structure, the two concave sliding surfaces of the core sliding block are smooth arc surfaces; the convex sliding surfaces of the two fixed blocks are provided with roller slide grooves arranged at equal intervals across the arc surfaces, and the cross-section of the roller slide groove is an arc shape with a central angle greater than 180°.

[0008] Preferably, the roller is embedded in the roller groove on the convex sliding surfaces of the two fixed blocks from one end, and the radius of the roller cross section is slightly smaller than the radius of the arc of the roller groove cross section, so that it can slide in the roller groove.

[0009] Further preferably, the center of the cross section of the rolling rod embedded in each fixed block is located on the same arc, and the arc is co-centric with the arc of the concave sliding surface of the corresponding core slider, so that the rolling rod can fully contact the concave sliding surface.

[0010] The aforementioned bidirectional sliding device for the center column of the underground structure has limit blocks formed integrally with the core slider at both ends of the two concave sliding surfaces of the core slider, which are used to limit the relative displacement between the core slider and the two fixed blocks.

[0011] Preferably, the limit stop block and the two fixed blocks are provided with support rod reserved holes, the cross-sectional diameter of the support rod reserved holes is slightly larger than the cross-sectional diameter of the support rod, so that the support rod can slide relatively therein; the support rod passes through the support rod reserved holes on the limit stop block, connecting the core slider and the two fixed blocks in series.

[0012] In the aforementioned bidirectional sliding device for the central column of the underground structure, the roller is made of high-strength steel of 400MPa or above; the support rod is made of low-yield point mild steel with a yield strength range of 100MPa to 225MPa.

[0013] The aforementioned bidirectional sliding device for the center column of the underground structure, the two fixing blocks are provided with bolt structures for fixing the bidirectional sliding device between the center column and the cross beam of the underground structure.

[0014] The aforementioned bidirectional sliding device for the center column of the underground structure is used in underground construction structures as a node between beams and columns; the fixed block located at the bottom of the core slider is fixed on the center column of the underground structure, and the fixed block located at the top of the core slider is fixed on the crossbeam of the underground structure.

[0015] In the application of the aforementioned bidirectional sliding device for the column in the underground structure, the specific functions include the following steps:

[0016] 1) Under normal conditions: the support rod connects the core slider and the two fixed blocks in series and limits them to ensure effective connection between the beams and columns of the underground structure;

[0017] 2) During earthquake: the support rod is destroyed first, and then the core slider and the two upper and lower fixed blocks slide freely in the horizontal and vertical directions through the rollers. When the relative displacement reaches a certain extent, the limit blocks on both sides of the core slider play a limiting role;

[0018] 3) After the earthquake, under the deadweight of the overlying soil of the underground structure, the core slider and the two fixed blocks are reset and return to a stable state. The support rods are also reset to connect the three in series and limit them, returning to normal working state.

[0019] The beneficial effects of the present invention are:

[0020] The device of the present invention replaces the common integrally consolidated beam-column joint in the traditional underground structure. In normal use, the support rod connects the upper fixed block, the two-way sliding surface core slider and the lower fixed block in series, and limits the position to ensure the effective connection between the beams and columns of the underground structure; when the earthquake load acts, the support rod is first destroyed, and then the upper and lower fixed blocks and the two-way sliding surface core slider can slide freely along the horizontal and longitudinal direction of the station through the roller rod. When the relative displacement reaches a certain degree, the limit plates on both sides of the two-way sliding surface core slider can play a limiting role; when the earthquake load ends, due to the arc sliding surface set by the two-way sliding surface core slider, the upper and lower fixed blocks and the two-way sliding surface core slider can return to a stable state under the deadweight of the overlying soil, that is, self-reset, and then can be connected in series and limited by the support rod to restore the normal working state. The safety performance of the key supporting components of the underground structure during the earthquake is guaranteed, and the possible damage to the underground structure in the earthquake is greatly reduced.

[0021] The support rod of the device of the present invention can not only temporarily support the upper and lower fixed blocks and the two-way sliding surface core slider during the installation process, but also connect the three in series to ensure the normal working performance of the device. Under the action of an earthquake, the two-way sliding surface core slider can slide between the upper and lower fixed blocks, and can slide in the horizontal and longitudinal directions of the station, so that the relative deformation between the layers of the underground subway station structure is not directly applied to the middle column, that is, the horizontal deformation of the middle column is effectively reduced while the vertical bearing capacity remains unchanged, thereby ensuring the safety performance of the key supporting components of the underground structure during the earthquake and greatly reducing the damage that may occur to the underground structure during the earthquake. After the earthquake, under the action of the gravity of the overlying soil, the upper and lower fixed blocks and the two-way sliding surface core slider return to a stable state, and can then be connected in series and limited through the support rod to restore the normal working state.

[0022] The device of the present invention has clear concept, definite principle, is easy to produce and maintain, and has good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a bidirectional sliding device for a central column of an underground structure according to the present invention;

[0024] Figure 2 It is a schematic diagram of the core slider structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the fixing block of the present invention;

[0026] Figure 4 The invention discloses an application of the bidirectional sliding device in a column of an underground structure.

[0027] In the figure: 1. core slider; 101. concave sliding surface; 2. fixing block; 201. convex sliding surface; 3. rolling rod; 301. rolling rod slide groove; 4. support rod; 401. support rod reserved hole; 5. limit stop block; 6. bolt structure; 7. center column; 8. cross beam. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the embodiments and drawings. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific embodiments are as follows:

[0029] A bidirectional sliding device for a column in an underground structure, such as Figures 1 to 3 As shown, it includes a core slider 1, on which arc-shaped concave sliding surfaces 101 are respectively arranged on the upper and lower sides, and the arrangement directions of the two concave sliding surfaces 101 are orthogonal to each other; two fixed blocks 2, which are respectively located at the upper and lower ends of the core slider 1, and the sides facing the core slider 1 are convex sliding surfaces 201 matching the concave sliding surfaces 101 of the core slider 1; a number of rolling rods 3, which are located between the core slider 1 and the two fixed blocks 2, so that rolling contact is formed between the core slider 1 and the two fixed blocks 2; a number of support rods 4, which are used to form a weak connection between the core slider 1 and the two fixed blocks 2. The device of the present invention replaces the ordinary integrally consolidated beam-column node in the traditional underground structure. During an earthquake, the core slider can slide between the upper and lower fixed blocks, so that the relative deformation between the layers of the underground subway station structure is not directly applied to the middle column, that is, the middle column has an unchanged vertical bearing capacity while the horizontal deformation is effectively reduced, which ensures the safety performance of the key supporting components of the underground structure during the earthquake and greatly reduces the damage that may occur to the underground structure during the earthquake.

[0030] In the bidirectional sliding device for the central column of the underground structure described in this embodiment, the two concave sliding surfaces 101 of the core slider 1 are smooth arc surfaces; the convex sliding surfaces 201 of the two fixed blocks 2 are provided with roller slide grooves 301 arranged at equal intervals across the arc surface, and the cross section of the roller slide groove 301 is an arc shape with a central angle greater than 180°. The roller 3 is embedded in the roller slide groove 301 on the convex sliding surface 201 of the two fixed blocks 2 from one end, and the radius of the cross section of the roller 3 is slightly smaller than the radius of the arc of the cross section of the roller slide groove 301, so that it can slide in the roller slide groove 301. In addition, the center of the cross section of the roller 3 embedded in each fixed block 2 is located on the same arc, and the arc is co-centered with the arc of the concave sliding surface 101 of the corresponding core slider 1, so that the roller 3 can fully contact the concave sliding surface 101. The roller 3 is made of high-strength steel of 400MPa or above to ensure the supporting strength of the bidirectional sliding device for the underground structure.

[0031] In the bidirectional sliding device for the central column of the underground structure described in this embodiment, both ends of the two concave sliding surfaces 101 of the core slider 1 are provided with limit blocks 5 integrally formed with the core slider 1, which are used to limit the relative displacement between the core slider 1 and the two fixed blocks 2. The limit blocks 5 and the two fixed blocks 2 are both provided with support rod reserved holes 401, and the cross-sectional diameter of the support rod reserved holes 401 is slightly larger than the cross-sectional diameter of the support rod 4, so that the support rod 4 can slide relatively therein; the support rod 4 passes through the support rod reserved holes 401 on the limit blocks 5, connecting the core slider 1 and the two fixed blocks 2 in series. The support rod 4 is made of low yield point mild steel with a yield strength range of 100MPa to 225MPa. It plays a limiting role in connecting the core slider 1 and the two fixed blocks 2, and ensures that it can bend under the action of an earthquake, so that there is a suitable relative sliding space between the core slider 1 and the fixed blocks 2.

[0032] The bidirectional sliding device for the central column of the underground structure described in this embodiment is widely used in engineering construction, for example, it can be used as a node of beams and columns in underground building structures such as railway tunnels, subway projects, underground shopping malls, and air defense projects. The two fixing blocks 2 are both provided with bolt structures 6. The fixing block 2 located at the lower part of the core slider 1 is fixed to the central column 7 of the underground structure, and the fixing block 2 located at the upper part of the core slider 1 is fixed to the crossbeam 8 of the underground structure. Figure 4 shown.

[0033] The bidirectional sliding device for the central column of the underground structure described in this embodiment has the following application process:

[0034] 1) Under normal circumstances: the support rod 4 connects the core slider 1 and the two fixed blocks 2 in series and limits them to ensure the effective connection between the beams and columns of the underground structure.

[0035] 2) When an earthquake occurs and seismic load is generated: the support rod 4 that connects the core slider 1 and the two fixed blocks 2 in series is first destroyed, and then the core slider 1 and the two upper and lower fixed blocks 2 slide freely in the horizontal and vertical directions through the rolling rod 3; when the relative displacement reaches a certain extent, the limit blocks 5 on both sides of the core slider 1 play a limiting role, limiting the relative displacement of sliding and ensuring the integrity of the underground structure.

[0036] 3) After the earthquake, the seismic load disappears. Since the core slider 1 and the two fixed blocks 2 are in arc-shaped sliding contact, the core slider 1 and the two fixed blocks 2 can be reset and return to a stable state under the deadweight of the overlying soil of the underground structure. After that, the support rod 4 will also be reset, and the core slider 1 and the two fixed blocks 2 will be connected in series and limited, returning to a normal working state.

[0037] The device of the present invention replaces the common integrally consolidated beam-column joint in the traditional underground structure. In normal use, the support rod connects the upper fixed block, the two-way sliding surface core slider and the lower fixed block in series, and limits the position to ensure the effective connection between the beams and columns of the underground structure; when the earthquake load acts, the support rod is first destroyed, and then the upper and lower fixed blocks and the two-way sliding surface core slider can slide freely along the horizontal and longitudinal direction of the station through the roller rod. When the relative displacement reaches a certain degree, the limit plates on both sides of the two-way sliding surface core slider can play a limiting role; when the earthquake load ends, due to the arc sliding surface set by the two-way sliding surface core slider, the upper and lower fixed blocks and the two-way sliding surface core slider can return to a stable state under the deadweight of the overlying soil, that is, self-reset, and then can be connected in series and limited by the support rod to restore the normal working state. The safety performance of the key supporting components of the underground structure during the earthquake is guaranteed, and the possible damage to the underground structure in the earthquake is greatly reduced.

[0038] The support rod of the device of the present invention can not only temporarily support the upper and lower fixed blocks and the two-way sliding surface core slider during the installation process, but also connect the three in series to ensure the normal working performance of the device. Under the action of an earthquake, the two-way sliding surface core slider can slide between the upper and lower fixed blocks, and can slide in the horizontal and longitudinal directions of the station, so that the relative deformation between the layers of the underground subway station structure is not directly applied to the middle column, that is, the horizontal deformation of the middle column is effectively reduced while the vertical bearing capacity remains unchanged, thereby ensuring the safety performance of the key supporting components of the underground structure during the earthquake and greatly reducing the damage that may occur to the underground structure during the earthquake. After the earthquake, under the action of the gravity of the overlying soil, the upper and lower fixed blocks and the two-way sliding surface core slider return to a stable state, and can then be connected in series and limited through the support rod to restore the normal working state.

[0039] In general, the device of the present invention has a clear concept, a definite principle, is easy to produce and maintain, and has good application value.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bidirectional sliding device for a column in an underground structure, characterized in that: include A core slider (1) having arc-shaped concave sliding surfaces (101) disposed on its upper and lower surfaces, respectively, and the two concave sliding surfaces (101) are disposed in directions perpendicular to each other; Two fixed blocks (2) are respectively located at the upper and lower ends of the core slider (1), and the sides thereof facing the core slider (1) are both convex sliding surfaces (201) matching the concave sliding surface (101) of the core slider (1); A plurality of rolling rods (3) are located between the core slider (1) and the two fixed blocks (2) so as to form rolling contact between the core slider (1) and the two fixed blocks (2); A plurality of support rods (4) used to form a weak connection between the core slider (1) and the two fixed blocks (2); The two concave sliding surfaces (101) of the core slider (1) are smooth arc surfaces; the convex sliding surfaces (201) of the two fixed blocks (2) are both provided with roller slide grooves (301) arranged at equal intervals across the arc surfaces, and the cross section of the roller slide grooves (301) is an arc shape with a central angle greater than 180°; The rolling rod (3) is embedded in a rolling rod slide groove (301) on the convex sliding surfaces (201) of the two fixed blocks (2) from one end, and the radius of the cross section of the rolling rod (3) is slightly smaller than the radius of the arc of the cross section of the rolling rod slide groove (301), so that it can slide in the rolling rod slide groove (301); The center of the cross section of the rolling rod (3) embedded in each fixed block (2) is located on the same arc, and the arc is co-centered with the arc of the concave and smooth surface (101) of the corresponding core slider (1), so that the rolling rod (3) and the concave and smooth surface (101) can fully contact each other; The bidirectional sliding device is used as a beam-column node when used in an underground building structure; a fixed block (2) located at the bottom of the core sliding block (1) is fixed to a central column (7) of the underground structure, and a fixed block (2) located at the top of the core sliding block (1) is fixed to a crossbeam (8) of the underground structure; Both ends of the two concave sliding surfaces (101) of the core slider (1) are provided with limit blocks (5) integrally formed with the core slider (1) for limiting the relative displacement between the core slider (1) and the two fixed blocks (2); the limit blocks (5) and the two fixed blocks (2) are provided with support rod reserved holes (401), the cross-sectional diameter of the support rod reserved holes (401) being slightly larger than the cross-sectional diameter of the support rod (4), so that the support rod (4) can slide relatively therein; the support rod (4) passes through the support rod reserved holes (401) on the limit blocks (5), so as to connect the core slider (1) and the two fixed blocks (2) in series; The rolling rod (3) is made of high-strength steel of 400MPa or above; the supporting rod (4) is made of low-yield point soft steel with a yield strength ranging from 100MPa to 225Mpa; The two fixing blocks (2) are both provided with bolt structures (6) for fixing the bidirectional sliding device between a column (7) and a crossbeam (8) in the underground structure; The process of using the bidirectional sliding device to improve the seismic resistance of underground structures and buildings is as follows: Under normal conditions: the support rod (4) connects the core slider (1) and the two fixed blocks (2) in series and limits the positions to ensure effective connection between the beams and columns of the underground structure; During an earthquake, the support rod (4) is first destroyed, and then the core slider (1) and the two upper and lower fixed blocks (2) slide freely in the horizontal and vertical directions through the rolling rod (3). When the relative displacement reaches a certain extent, the limit blocks (5) on both sides of the core slider (1) play a limiting role. After the earthquake, under the action of the deadweight of the soil overlying the underground structure, the core slider (1) and the two fixed blocks (2) are reset to return to a stable state, and the support rod (4) is also reset to connect the three in series and limit the position, thus returning to a normal working state; During an earthquake, the core sliding block (1) can slide between the upper and lower fixed blocks (2), so that the relative deformation between layers of the underground subway station structure is not directly applied to the central column (7).

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