CN108131143A - A kind of construction method of super-span tunnel top bar CD methods - Google Patents

A kind of construction method of super-span tunnel top bar CD methods Download PDF

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Publication number
CN108131143A
CN108131143A CN201711251181.5A CN201711251181A CN108131143A CN 108131143 A CN108131143 A CN 108131143A CN 201711251181 A CN201711251181 A CN 201711251181A CN 108131143 A CN108131143 A CN 108131143A
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China
Prior art keywords
tunnel
bar
base tunnel
predicament
construction
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CN201711251181.5A
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Chinese (zh)
Inventor
陈建勋
陈丽俊
罗彦斌
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长安大学
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Priority to CN201711251181.5A priority Critical patent/CN108131143A/en
Publication of CN108131143A publication Critical patent/CN108131143A/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries

Abstract

The invention belongs to Tunnel Engineering technical fields, and in particular to a kind of construction method of super-span tunnel top bar CD methods.The method is based on traditional top bar CD methods, by increasing the numbers of steps of leading base tunnel and rear row base tunnel in top bar CD methods, make leading base tunnel and rear row base tunnel be adjusted to two steps excavation, in constructing to avoid super-span tunnel top bar CD methods caused by leading base tunnel and excavation height of rear row base tunnel are excessively high face unstability, cave in.

Description

A kind of construction method of super-span tunnel top bar CD methods
Technical field
The invention belongs to Tunnel Engineering technical fields, and in particular to a kind of construction party of super-span tunnel top bar CD methods Method.
Background technology
Top bar CD methods are a kind of method for tunnel construction for taking into account the respective advantage of traditional CD methods and benching tunnelling method, on the one hand its energy Enough reduce tunnel excavation span, effectively control arch sedimentation, another aspect working procedure is relatively fewer, and number is disturbed to country rock Less, speed of application is relatively fast.It was applied in the constructing tunnel of upper-soft lower-hard ground and V grade of buried section of country rock in recent years It is more, and be mainly used in and excavate span as the large span or middle span tunnel within 15m.With China's single-hole with four lanes public affairs This kind of super-span Tunnel Engineering quantity such as road tunnel is on the increase, and top bar CD methods are also gradually applied, main at present It is applied to the constructing tunnel of IV grade of buried section of country rock.
Although there is apparent advantage using the construction of top bar CD methods, still encountered in super-span constructing tunnel Problem:Since super-span tunnel excavation section is big, if constructing according to traditional top bar CD methods, leading base tunnel and rear row base tunnel are equal It is excavated using primary, then the excavation height of leading base tunnel and rear row base tunnel is up to as many as 9m, is equivalent to single hole two to two Lane road tunnel carries out full face tunneling, and encountering face wall rock condition variation, (leading base tunnel and rear row base tunnel use Primary to excavate, excavation face can not be from steady) situation when, it is likely that the problems such as generating the unstability of face, caving in seriously affects and applies Work safety and progress, and project cost can also greatly increase.Therefore, in super-span tunnel top bar CD method work progress In, for wall rock condition be deteriorated situation, should not confine in existing construction method, and should dare to attempt to existing engineering method into Row improves or researches and develops new engineering method.
Invention content
For above-mentioned technical problem, the present invention provides a kind of construction method of super-span tunnel top bar CD methods, with solution Certainly super-span tunnel during wall rock condition poor (leading base tunnel and rear row base tunnel are excavated using primary, and excavation face can not be from surely) In the construction of top bar CD methods caused by leading base tunnel and excavation height of rear row base tunnel are excessively high face unstability, cave in etc. and to ask Topic.
The present invention is achieved by the following technical solutions:
A kind of construction method of super-span tunnel top bar CD methods, the method are based on traditional top bar CD methods, formerly In the digging process of row base tunnel and rear row base tunnel, by the numbers of steps for increasing leading base tunnel and rear row base tunnel make leading base tunnel and Row base tunnel is adjusted to two steps by traditional step excavation respectively and excavates afterwards, avoid in the top bar CD methods construction of super-span tunnel because Face unstability caused by leading base tunnel and excavation height of rear row base tunnel are excessively high is caved in.
Further, two step digging process of leading base tunnel are specially:
1) leading base tunnel top bar is excavated:Leading base tunnel top bar height is 3~5m, and length of bench is 5~10m;
2) the leading base tunnel top bar preliminary bracing of construction, applies leading base tunnel top bar median septum gib;
3) leading base tunnel is excavated to get out of a predicament or an embarrassing situation:Leading base tunnel gets out of a predicament or an embarrassing situation height as 3~5m, and length is 10~30m;
4) the leading base tunnel of constructing is got out of a predicament or an embarrassing situation preliminary bracing, is applied leading base tunnel and is got out of a predicament or an embarrassing situation median septum gib.
Further, two step digging process of rear row base tunnel are specially:
1) row base tunnel top bar after excavating:After leading base tunnel top bar excavation length is more than 15m, starts row after excavating and lead Top bar is cheated, length of bench is 5~10m;
2) row base tunnel top bar preliminary bracing after constructing;
3) row base tunnel is got out of a predicament or an embarrassing situation after excavating:Length of bench is 10~20m;
4) row base tunnel is got out of a predicament or an embarrassing situation preliminary bracing after constructing.
Further, the construction method of super-span tunnel top bar CD methods is specially:
1) two steps of leading base tunnel are excavated;
2) two steps of row base tunnel are excavated afterwards;
3) median septum gib is removed:It removes leading base tunnel top bar median septum gib and removes leading base tunnel Median septum of getting out of a predicament or an embarrassing situation gib;It is 3~5 meters to remove length every time;
4) left part of getting out of a predicament or an embarrassing situation is excavated, and applies left side preliminary bracing of getting out of a predicament or an embarrassing situation in time, excavates right part of getting out of a predicament or an embarrassing situation, And left side preliminary bracing of getting out of a predicament or an embarrassing situation is applied in time;
5) Core Soil of getting out of a predicament or an embarrassing situation is excavated;
6) inverted arch part is excavated, and carries out applying for inverted arch preliminary bracing;
7) secondary lining is applied:Inverted arch secondary lining is first performed, then applies arch wall secondary lining;
8) 1) -7 are repeated) step, complete the construction in super-span tunnel.
Further, the super-span tunnel for single-hole with four lanes vcehicular tunnel or excavates tunnel of the span not less than 18m Road.
The advantageous effects of the present invention:
The construction method of the super-span tunnel top bar CD methods of offer, mainly solves that wall rock condition is poor (to lead in advance Hole and rear row base tunnel are excavated using primary, and excavation face can not be from steady) when the top bar CD methods construction of super-span tunnel in because of elder generation Face unstability caused by row base tunnel and excavation height of rear row base tunnel are excessively high, the problems such as caving in;In addition, enhance top bar The flexibility of CD methods construction and applicability, surrounding rock stability improve or are deteriorated, and can change in time, be transformed into other works Method.
Description of the drawings
Fig. 1 is the process schematic diagram that top bar CD methods of the present invention improve engineering method;
Fig. 2 is traditional top bar CD method process schematic diagrames;
Reference numeral:
1. leading base tunnel;2. leading base tunnel preliminary bracing;3. median septum gib;Row base tunnel after 4.;Row base tunnel after 5. Preliminary bracing;6. left part of getting out of a predicament or an embarrassing situation;7. left side preliminary bracing of getting out of a predicament or an embarrassing situation, 8. get out of a predicament or an embarrassing situation right part;9. right side of getting out of a predicament or an embarrassing situation Preliminary bracing;10. Core Soil of getting out of a predicament or an embarrassing situation;11. inverted arch part;12. inverted arch preliminary bracing;13. inverted arch secondary lining;14. arch wall Secondary lining;The leading base tunnel top bars of 2-1.;The leading base tunnel top bar preliminary bracings of 2-2.;The leading base tunnel top bar intervals of 2-3. Wall gib;The leading base tunnels of 2-4. are got out of a predicament or an embarrassing situation;The leading base tunnels of 2-5. are got out of a predicament or an embarrassing situation preliminary bracing;During the leading base tunnels of 2-6 are got out of a predicament or an embarrassing situation Next door gib;Row base tunnel top bar after 2-7.;Row base tunnel top bar preliminary bracing after 2-8.;Row base tunnel is left office after 2-9. Rank;Row base tunnel is got out of a predicament or an embarrassing situation preliminary bracing after 2-10..
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies Change, equivalent method and scheme.Further, in order to which the public is made to have a better understanding the present invention, below to the thin of the present invention It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art Description can also understand the present invention completely.
Embodiment 1
The present embodiment provides a kind of construction method of super-span tunnel top bar CD methods, for super-span tunnel surrounding The situation of bad stability, by increasing in top bar CD methods the numbers of steps of leading base tunnel and rear row base tunnel to traditional top bar CD methods are improved, to avoid caused by leading base tunnel and excavation height of rear row base tunnel are excessively high face unstability, cave in The problems such as.Top bar CD methods process schematic diagram is as shown in Figure 1 after improvement.The improved specific process of engineering method is as follows:
1. excavate leading base tunnel top bar 2-1:Leading base tunnel top bar height is 3~5m, and length of bench is 5~10m;
2. construct leading base tunnel top bar preliminary bracing 2-2, leading base tunnel top bar median septum gib 2-3 is applied;
3. it excavates leading base tunnel to get out of a predicament or an embarrassing situation 2-4:Leading base tunnel gets out of a predicament or an embarrassing situation height as 3~5m, and length is 10~30m;
The preliminary bracing 2-5 4. leading base tunnel of constructing is got out of a predicament or an embarrassing situation applies leading base tunnel and gets out of a predicament or an embarrassing situation median septum gib 2-6;
5. row base tunnel top bar 2-7 after excavating:After leading base tunnel top bar excavation length is more than 15m, after starting excavation Row base tunnel top bar, length of bench are 5~10m;
6. row base tunnel top bar preliminary bracing 2-8 after construction;
7. row base tunnel is got out of a predicament or an embarrassing situation 2-9 after excavating:Length of bench is 10~20m;
8. row base tunnel is got out of a predicament or an embarrassing situation preliminary bracing 2-10 after construction;
9. it removes leading base tunnel top bar median septum gib 2-3 and leading base tunnel is got out of a predicament or an embarrassing situation median septum gib 2- 6:Remove length every time is advisable with 3~5 meters;
The left part 6 10. excavation is got out of a predicament or an embarrassing situation, and left side preliminary bracing 7 of getting out of a predicament or an embarrassing situation is applied in time, excavate right side of getting out of a predicament or an embarrassing situation Divide 8, and apply right side preliminary bracing 9 of getting out of a predicament or an embarrassing situation in time;
Excavation is got out of a predicament or an embarrassing situation Core Soil 10;
Inverted arch part 11 is excavated, and carries out applying for inverted arch preliminary bracing 12;
Apply secondary lining:Inverted arch secondary lining 13 is first performed, then applies arch wall secondary lining 14;
It repeatsStep completes the top bar CD methods construction of super-span tunnel.
The working procedure of traditional top bar CD methods is as shown in Fig. 2, Specific construction process is as follows:
1. excavate leading base tunnel 1:Leading base tunnel height is 8~9m, and leading base tunnel length is 15~40m;
2. leading base tunnel preliminary bracing 2 of constructing, applies median septum gib 3;
3. row base tunnel 4 after excavating:After leading excavation with guide pit length is more than 15m, start row base tunnel after excavating, rear row base tunnel Length is 15~30m;
4. row base tunnel preliminary bracing 5 after construction;
5. remove median septum gib 3:Remove length every time is advisable with 3~5 meters;
The left part 6 6. excavation is got out of a predicament or an embarrassing situation, and left side preliminary bracing 7 of getting out of a predicament or an embarrassing situation is applied in time, excavate right side of getting out of a predicament or an embarrassing situation Divide 8, and apply right side preliminary bracing 9 of getting out of a predicament or an embarrassing situation in time;
The Core Soil 10 7. excavation is got out of a predicament or an embarrassing situation;
8. excavating inverted arch part 11, and carry out applying for inverted arch preliminary bracing 12;
9. apply secondary lining:Inverted arch secondary lining 13 is first performed, then applies arch wall secondary lining 14;
10. repeating 1.~9. step, the construction of tunnel top bar CD methods is completed.
When super-span tunnel is constructed according to traditional top bar CD methods, leading base tunnel and rear row base tunnel are used and are once opened It digging, excavation height would be possible to reach as many as 9m, is equivalent to and carries out full face tunneling to two single holes two lane vural roads tunnel, Encounter the situation of face wall rock condition variation (leading base tunnel and rear row base tunnel are excavated using primary, and excavation face can not be from surely) When, it is likely that the problems such as generating the unstability of face, caving in seriously affects construction safety and progress, and project cost also can It greatly increases.

Claims (5)

1. a kind of construction method of super-span tunnel top bar CD methods, which is characterized in that the method is based on traditional top bar CD methods in the digging process of leading base tunnel and rear row base tunnel, are made by the numbers of steps for increasing leading base tunnel and rear row base tunnel Leading base tunnel and rear row base tunnel are adjusted to two steps excavation, avoid in the top bar CD methods construction of super-span tunnel because of leading base tunnel With rear excavation height of row base tunnel it is excessively high caused by face unstability, cave in.
2. a kind of construction method of super-span tunnel top bar CD methods according to claim 1, which is characterized in that lead in advance Hole two step digging process be specially:
1)Excavate leading base tunnel top bar:Leading base tunnel top bar height is 3 ~ 5m, and length of bench is 5 ~ 10m;
2)It constructs leading base tunnel top bar preliminary bracing, applies leading base tunnel top bar median septum gib;
3)Leading base tunnel is excavated to get out of a predicament or an embarrassing situation:Leading base tunnel gets out of a predicament or an embarrassing situation height as 3 ~ 5m, and length is 10 ~ 30m;
4)Leading base tunnel of constructing is got out of a predicament or an embarrassing situation preliminary bracing, is applied leading base tunnel and is got out of a predicament or an embarrassing situation median septum gib.
3. a kind of construction method of super-span tunnel top bar CD methods according to claim 2, which is characterized in that rear row is led Hole two step digging process be specially:
1)Row base tunnel top bar after excavation:After leading base tunnel top bar excavation length is more than 15m, start after excavating on row base tunnel Step, length of bench are 5 ~ 10m;
2)Row base tunnel top bar preliminary bracing after construction;
3)Row base tunnel is got out of a predicament or an embarrassing situation after excavation:Length of bench is 10 ~ 20m;
4)Row base tunnel is got out of a predicament or an embarrassing situation preliminary bracing after construction.
A kind of 4. construction method of super-span tunnel top bar CD methods according to claim 3, which is characterized in that super-span Degree tunnel top bar CD methods construction method be specially:
1)Two steps of leading base tunnel are excavated;
2)Two steps of row base tunnel are excavated afterwards;
3)Remove median septum gib:It removes leading base tunnel top bar median septum gib and removes leading base tunnel and leave office Rank median septum gib;It is 3 ~ 5 meters to remove length every time;
4)Excavation is got out of a predicament or an embarrassing situation left part, and applies left side preliminary bracing of getting out of a predicament or an embarrassing situation in time, and excavation is got out of a predicament or an embarrassing situation right part, and and When apply get out of a predicament or an embarrassing situation left side preliminary bracing;
5)Excavation is got out of a predicament or an embarrassing situation Core Soil;
6)Inverted arch part is excavated, and carries out applying for inverted arch preliminary bracing;
7)Apply secondary lining:Inverted arch secondary lining is first performed, then applies arch wall secondary lining;
8)Repeat 1)-7)Step completes the construction in super-span tunnel.
5. a kind of construction method of super-span tunnel top bar CD methods according to claim 1, which is characterized in that described super Longspan tunnel is single-hole with four lanes vcehicular tunnel or excavates tunnel of the span not less than 18m.
CN201711251181.5A 2017-12-01 2017-12-01 A kind of construction method of super-span tunnel top bar CD methods CN108131143A (en)

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CN108843332A (en) * 2018-07-15 2018-11-20 中铁二十局集团有限公司 Pass through fault belt large cross-section tunnel excavation and method for protecting support

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Publication number Priority date Publication date Assignee Title
CN108843332A (en) * 2018-07-15 2018-11-20 中铁二十局集团有限公司 Pass through fault belt large cross-section tunnel excavation and method for protecting support

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Application publication date: 20180608