CN203230429U - Constant annular width beveling-type tunnel opening buffer structure - Google Patents
Constant annular width beveling-type tunnel opening buffer structure Download PDFInfo
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- CN203230429U CN203230429U CN 201220750717 CN201220750717U CN203230429U CN 203230429 U CN203230429 U CN 203230429U CN 201220750717 CN201220750717 CN 201220750717 CN 201220750717 U CN201220750717 U CN 201220750717U CN 203230429 U CN203230429 U CN 203230429U
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- end platform
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Abstract
The utility model provides a constant annular width beveling-type tunnel opening buffer structure comprising a pilot tunnel, wherein, the pilot tunnel is in a butt joint with a constant section of an opening lining structure and extends towards the exterior of a tunnel. The outer wall of the pilot tunnel expands outwardly to form a constant annular width tunnel portal end table whose end face is constant-width and annular, the outer end face of the tunnel portal end table is a bevel cut which gradually inclines inwardly from bottom to top, and the top of the pilot tunnel is provided with two openings along the length direction of the tunnel, or the side wall of the pilot tunnel is symmetrically provided with two openings along the length direction of the tunnel. According to the constant annular width beveling-type tunnel opening buffer structure, a tunnel opening micro-pressure wave effect of a railway tunnel can be mitigated; the buffer structure is an open cut tunnel type buffer structure, is shorter and requires a small opening space so that the buffer structure is slightly limited to the landform of the opening; by providing an optimal opening position and structural parameters, the capability of the buffer structure for mitigating the micro-pressure wave effect of the opening can be developed to the greatest extent, the production cost of the opening buffer structure is effectively reduced, the economic benefit is obvious, and extremely high practicability is achieved.
Description
Technical field
The utility model relates to the Tunnel Portal Structures field, specifically refers to ring width inclined cutout tunnel portal buffer structures such as a kind of.
Background technology
When bullet train passes through the tunnel, can in the tunnel, produce a series of aerodynamic effects with the tunnel portal place, mainly comprise reaching pneumatic load effect and locomotive additional drag effect in the interior transient pressure effect of train, tunnel portal micro-pressure wave effect, the tunnel in the hole.Wherein, the main performance of hole micro-pressure wave effect is: the place produces the Pneumatical Blowing noise at the hole, causes the hole low frequency high vibration of lightweight structures thing (locomotive window, housing window) on every side.Hole micro-pressure wave effect is destroyed bigger to the hole surrounding environment, have a strong impact on hole periphery resident's daily life.
It is a kind of method that is commonly used to alleviate the micro-pressure wave effect that the hole buffer structure is set at the tunnel portal place, and the hole buffer structure is the hole body extension section that is stretched out and formed by the lining cutting of tunnel portal section, and in hole body extension section surface arrange openings.Buffer structure length, open amount, parameters such as aperture position, buffer structure cross-sectional area are determined according to the factors such as blockage ratio in length of tunnel, locomotive speed, type of locomotive, hole landform, locomotive and tunnel.According to open amount, can be divided into three kinds of buffer structures of single radial cut type, two open-type, many open-types (3 and more than) to buffer structure; According to the ratio of buffer structure with the cross-sectional area of tunnel portal lining cutting section, can be divided into uniform section type and expansion type buffer structure to buffer structure.Existing buffer structure can play the effect of alleviating hole micro-pressure wave effect, but parameters such as the length of buffer structure, cross-sectional area, aperture position, the aperture opening ratio ratio of tunnel cross sectional area (the opening gross area with), open amount, portal form can the appreciable impact buffer structure to the remission effect of hole micro-pressure wave effect, cause alleviating on the one hand micro-pressure wave poor effect, financial cost height on the other hand.And short tunnel is stronger in the hole micro-pressure wave effect ratio in the tunnel of growing up, and usually adopts long many openings expansion type buffer structure.But at little landform places, space, hole such as bridge tunnel linkage sections, long many openings expansion type buffer structure often can't be set.
Summary of the invention
The purpose of this utility model is to provide ring width inclined cutout tunnel portal buffer structure such as a kind of according to above-mentioned deficiency, makes that it is simple in structure, steadiness good, cost is low, and it is remarkable to alleviate micro-pressure wave effect effect, is applicable to the tunnel of growing up that the space, hole is little.
The utility model is achieved by the following technical solution:
Ring width inclined cutout tunnel portal buffer structure such as a kind of, it is characterized in that: described hole buffer structure comprises with hole liner structure uniform section and docking, and be positioned at the pilot tunnel in the tunnel outside, in described pilot tunnel entrance portal end platform is set, described portal end platform outer face is the scarf that progressively tilts inwardly from down to up, the inwall of described portal end platform is the extension of pilot tunnel inwall, the outer wall of described portal end platform is the inclined-plane opposite with portal end platform outer face incline direction, and join with the pilot tunnel outer wall, wall thickness is identical along circumferential direction between described portal end platform inside and outside wall, is the portal end platform of wide annular; Described pilot tunnel top is furnished with two openings along the length of tunnel direction, or the pilot tunnel sidewall is along respectively arranging two openings on the length of tunnel direction.By the portal end platform of ring width scarves such as arranging and the mode of pilot tunnel opening buffering, can alleviate the micro-pressure wave effect, simultaneously 2 openings only need be set and be effective, provide cost savings.
Preferably, the length at described pilot tunnel top is 15-30m.Preferred pilot tunnel length can reduce the hole and take up room, and stronger to the compliance of landform, especially little bridge tunnel junction, space, hole has stronger practicality.
Preferably, the described opening gross area is 0.1-0.35 with the area ratio of hole liner structure cross-sectional area.This preferable range has the effect of good alleviation micro-pressure wave effect, and difficulty of construction is low simultaneously.
Preferably, the angle of slope of described portal end platform is 30-75 °.This preferable range has the effect of good alleviation micro-pressure wave effect, and difficulty of construction is low simultaneously, and security performance is good.
Preferably, described pilot tunnel is open cut tunnel.
Preferably, form at the vault place between the top of described portal end platform and the outer wall of portal and choose height, choose that the angle of slope is 100-175 ° between high and portal axis.Have good anti-slope failure, the function of rock-fall proof, steadiness is good.
Preferably, portal end platform inside and outside wall thickness is 0.3-2m.This thickness makes portal end platform structure more firm.
Ring width inclined cutout tunnel portal buffer structure such as of the present utility model is steel concrete monobloc cast body, resistance to overturning is good, the degree of safety height, hole micro-pressure wave effect be can significantly alleviate, the Property of Blasting Noise pollution of high-speed railway tunnel portal and the low frequency vibration problem of lightweight structures thing (housing window) solved effectively.Simultaneously ring such as the utility model pair opening open cut tunnel type buffer structures of cutting sth. askew have provided the optional scope at each parameter of buffer structure (buffer structure length, aperture opening ratio, portal angle of slope), enlarged the range of application of buffer structure, can be under identical cost situation, reach best hole micro-pressure wave remission effect, realize the economic effect maximization.The utility model length is shorter in addition, and it is little to take the space, hole, and is strong to hole landform compliance, is particularly useful for less bridge tunnel junction, space, hole.
Description of drawings
Fig. 1 is the open-topped perspective view of the utility model pilot tunnel;
Fig. 2 looks schematic diagram for master of the present utility model;
Fig. 3 is the open-topped longitudinal section schematic diagram of the utility model pilot tunnel;
Liner structure, 2. pilot tunnel, 3. portal end platform, 4. first opening, 5. second opening, 6. the landform bank protection, 7. the pilot tunnel outer wall, 8. portal end platform outer wall, 9. portal end platform inwall, 10. height is chosen at portal end platform angle of slope, 11..
The specific embodiment
Further specify the utility model below in conjunction with accompanying drawing:
As Figure 1-3, the utility model hole buffer structure is positioned on the landform bank protection 6, and described hole buffer structure comprises with hole liner structure 1 uniform section and docking, and is positioned at the pilot tunnel 2 in the outside, tunnel.In described pilot tunnel 2 entrance portal end platform 3 is set, described portal end platform 3 outer faces are the scarf that progressively tilts inwardly from down to up, the inwall 9 of described portal end platform is the extension of pilot tunnel inwall, the outer wall 8 of described portal end platform is the inclined-plane opposite with portal end platform outer face incline direction, and join with pilot tunnel outer wall 7, wall thickness is identical along circumferential direction between described portal end platform inside and outside wall, and wall thickness is 0.3-2m.Portal end platform for wide annular.Described pilot tunnel 2 tops are furnished with two openings along the length of tunnel direction, i.e. first opening 4 and second opening 5, or the pilot tunnel sidewall is along respectively arranging two openings (not drawing among the figure) on the length of tunnel direction.The length at described pilot tunnel top is 15-30m.The described opening gross area is 0.1-0.35 with the area of hole lining cutting internal cavity cross-sectional area than β.Described portal end platform angle of slope 10 is 30-75 °.Pilot tunnel 2 is open cut tunnel.Form at the vault place between the top of described portal end platform and the outer wall of portal and choose height, choose that the angle of slope is 100-175 ° between high and portal axis.
As shown in Figure 3, it is 18m for the length L at pilot tunnel 2 tops that the utility model is specifically used optimum embodiment, and the cross-sectional area of pilot tunnel 2 is 1 with the ratio of the cross-sectional area of hole liner structure 1, and aperture opening ratio β is 0.18, and portal end platform angle of slope is 45 °.The longitudinal length a of first opening 4 is 6m, and the longitudinal length b of second opening 5 is 4m, and aperture pitch c1 is that 3m, c2 are that 4m, c3 are 1m, and the hoop width of opening converts and can get according to aperture opening ratio and tunnel cross-sectional area.For the situation of sidewall opening, vertical parameter of opening is identical with open top, the hoop parameter of opening (being A/F) for open-topped half.
The utility model hole buffer structure is steel concrete monobloc cast body, resistance to overturning is good, the degree of safety height can significantly be alleviated hole micro-pressure wave effect, solves the Property of Blasting Noise pollution of high-speed railway tunnel portal and the low frequency vibration problem of lightweight structures thing (housing window) effectively.Simultaneously ring such as the utility model pair opening open cut tunnel type buffer structures of cutting sth. askew have provided the optional scope at each parameter of buffer structure (buffer structure length, aperture opening ratio, portal angle of slope), enlarged the range of application of buffer structure, can be under identical cost situation, reach best hole micro-pressure wave remission effect, realize the economic effect maximization.The utility model length is shorter in addition, and it is little to take the space, hole, and is strong to hole landform compliance, is particularly useful for less bridge tunnel junction, space, hole.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (7)
1. ring width inclined cutout tunnel portal buffer structure such as a kind, it is characterized in that: described hole buffer structure comprises with hole liner structure uniform section and docking, and be positioned at the pilot tunnel in the tunnel outside, in described pilot tunnel entrance portal end platform is set, described portal end platform outer face is the scarf that progressively tilts inwardly from down to up, the inwall of described portal end platform is the extension of pilot tunnel inwall, the outer wall of described portal end platform is the inclined-plane opposite with portal end platform outer face incline direction, and join with the pilot tunnel outer wall, wall thickness is identical along circumferential direction between described portal end platform inside and outside wall, is the portal end platform of wide annular; Described pilot tunnel top is furnished with two openings along the length of tunnel direction, or the pilot tunnel sidewall is along respectively arranging two openings on the length of tunnel direction.
2. according to ring width inclined cutout tunnel portal buffer structure such as claim 1 is described, it is characterized in that: the length at described pilot tunnel top is 15-30m.
3. according to ring width inclined cutout tunnel portal buffer structures such as claim 1 are described, it is characterized in that: the area of the described opening gross area and hole liner structure internal cavity cross-sectional area is than being 0.1-0.35.
4. according to ring width inclined cutout tunnel portal buffer structure such as claim 1 is described, it is characterized in that: the angle of slope of described portal end platform is 30-75 °.
5. according to ring width inclined cutout tunnel portal buffer structure such as claim 1 is described, it is characterized in that: described pilot tunnel is open cut tunnel.
6. according to ring width inclined cutout tunnel portal buffer structures such as claim 1 are described, it is characterized in that: form at the vault place between the top of described portal end platform and the outer wall of portal and choose height, choose that the angle of slope is 100-175 ° between high and portal axis.
7. according to ring width inclined cutout tunnel portal buffer structure such as claim 1 is described, it is characterized in that: portal end platform inside and outside wall thickness is 0.3-2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220750717 CN203230429U (en) | 2012-12-31 | 2012-12-31 | Constant annular width beveling-type tunnel opening buffer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220750717 CN203230429U (en) | 2012-12-31 | 2012-12-31 | Constant annular width beveling-type tunnel opening buffer structure |
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| Publication Number | Publication Date |
|---|---|
| CN203230429U true CN203230429U (en) | 2013-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220750717 Expired - Lifetime CN203230429U (en) | 2012-12-31 | 2012-12-31 | Constant annular width beveling-type tunnel opening buffer structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032079A (en) * | 2012-12-31 | 2013-04-10 | 中铁第四勘察设计院集团有限公司 | Constant annular width bevel type tunnel opening buffer structure |
| CN104533442A (en) * | 2014-12-18 | 2015-04-22 | 中铁二院工程集团有限责任公司 | Rockfall prevention structure for tunnel portal |
-
2012
- 2012-12-31 CN CN 201220750717 patent/CN203230429U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032079A (en) * | 2012-12-31 | 2013-04-10 | 中铁第四勘察设计院集团有限公司 | Constant annular width bevel type tunnel opening buffer structure |
| CN104533442A (en) * | 2014-12-18 | 2015-04-22 | 中铁二院工程集团有限责任公司 | Rockfall prevention structure for tunnel portal |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131009 |