CN101363322A - Construction method for changing single line to be double in tunnel - Google Patents

Construction method for changing single line to be double in tunnel Download PDF

Info

Publication number
CN101363322A
CN101363322A CNA2008100794867A CN200810079486A CN101363322A CN 101363322 A CN101363322 A CN 101363322A CN A2008100794867 A CNA2008100794867 A CN A2008100794867A CN 200810079486 A CN200810079486 A CN 200810079486A CN 101363322 A CN101363322 A CN 101363322A
Authority
CN
China
Prior art keywords
line
construction
wire
tunnel
lead
Prior art date
Application number
CNA2008100794867A
Other languages
Chinese (zh)
Inventor
王利民
李五红
谷孝军
蒋荣富
雷军
赵香萍
吕宇新
邓尤波
Original Assignee
中铁十二局集团第二工程有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中铁十二局集团第二工程有限公司 filed Critical 中铁十二局集团第二工程有限公司
Priority to CNA2008100794867A priority Critical patent/CN101363322A/en
Publication of CN101363322A publication Critical patent/CN101363322A/en

Links

Abstract

The present invention relates to the technical field of tunnel construction, particular to a construction method for changing a single tunnel line into double lines. The method solves the problems of easy collapse, ,collapse caused by multiple times of perturbation towards wall rock, and the like, in the prior construction for changing the single tunnel line into the double lines. The method comprises the steps as follows: a contour line of a double-line tunnel arch is excavated for forepoling; upper arc guide single line primary support is processed for unit division, each unit is considered as a basic unit, a support system is decomposed and dismantled, and finally, double-line excavation is processed to be constructed as the primary support; after upper arc guide expanding excavation is advanced, middle guide construction is started to be consistent with the step of the upper arc guide construction; the left side and the right side of middle guide are constructed alternatively; after middle guide expanding excavation is advanced, lower guide construction is started to be consistent with the step of the middle guide construction; and finally, double-line inverted arch construction and secondary lining are processed. The present invention successfully solves the problems that the expanding excavation for changing the single line into the double lines is difficult and results in easy collapse, avoids the large-area collapse caused by the mutual involvement of the prior single line support system, as well as the destabilization collapse caused by multiple times of perturbation towards the wall rock, and achieves the goal of fast, safe and economical construction.

Description

A kind of tunnel single line changes the job practices of two-wire

Technical field

The present invention relates to the tunnel construction technology field, be specially the job practices that a kind of tunnel single line changes two-wire.

Background technology

Known, along with fast development of national economy, the present highway of building of China, railway, subway tunnel often will change single line into two-wire, enlarge the operation scale; Perhaps the railway in some Hot work in progress, highway tunnel single line will change two-wire through regular meeting into owing to cause specific, this just means to expand existing tunnel and digs, but up to the present, in practice of construction, there are a lot of problems, (1) forms by advance support, steel bow member, dowel, steel mesh reinforcement, system anchor bolt sprayed mortar owing to former single line support system, be a non-individual body, directly the dismounting meeting causes that owing to being implicative of each other large tracts of land is caved in even landslip; (2) do not have rational, referential expansion excavation method,, facts have proved, can cause very difficulty of construction, very easily cave in, cause casualties if still adopt common benching tunnelling method excavation; (3) do not have scientific and reasonable expansion to dig blasting scheme, easily because of to country rock repeatedly disturbance cause that unstability caves in, in sum, present common benching tunnelling method can't realize that the tunnel single line changes quick, safe, the economic purpose of two-wire.

Summary of the invention

The present invention adopts existing common benching tunnelling method to carry out the tunnel single line to change in the two-wire construction in order to solve, exist to expand and to dig difficulty, easily landslide, easily country rock is produced repeatedly disturbance and cause and cave in and speed of application is slow, construction cost is than problems such as height, provide a kind of tunnel single line to change the job practices of two-wire.

The present invention adopts following technical scheme to realize: a kind of tunnel single line changes the job practices of two-wire, may further comprise the steps: (1) carries out the ductule advance support along double track tunnel arch excavation outline line; (2) will go up the preliminary bracing of arc guide single line according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, form independently junior unit, be base unit with each unit then, under the advance support protection, carry out arc guide support system decomposition dismounting on the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, each construction length must not surpass Pin bow member, i.e. a 80~100cm; (3) treating that arc guide expands to dig behind leading 3~5m leads construction in the beginning, in lead when construction according to benching tunnelling method construction shoulder height and cyclic advance will in lead the single line preliminary bracing and carry out dividing elements, be base unit with each unit then, decompose dismounting with leading support system in the former single line, carry out two-wire at last and expand and to dig and to perform preliminary bracing, in lead the staggered construction in the left and right sides, the successively staggered 2m that is not less than, each construction length must not surpass two Pin bow member, i.e. 160~200cm; (4) lead in treating to expand to dig and lead construction under beginning behind leading 3~5m, under lead when construction and will lead the single line preliminary bracing down according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, be base unit with each unit then, decompose dismounting with leading support system under the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, lead the staggered construction in the left and right sides down, the successively staggered 2m that is not less than, each construction length must not surpass two Pin bow member, i.e. 160~200cm; (5) repeat above-mentioned four steps, when barrel expands when digging leading 20~30m, the construction of beginning inverted arch is removed former single line inverted arch and is expanded and dig, and inverted arch is once removed construction length must not surpass 6m; When inverted arch was constructed leading 60~80m, the two-wire secondary lining that begins to construct constantly circulated according to above-mentioned steps, realized that the expansion that the tunnel single line changes two-wire digs.In the said process, when former single line support system is carried out dividing elements, at first will be according to tunnel cross-section size, country rock geological condition, and requirements such as equipment, the required working space of personnel, shoulder height and cyclic advance when determining the benching tunnelling method construction, and then determine each cell size, be prerequisite to guarantee that each unit when constructing landslide does not take place, for example for IV, V level country rock, the length of each unit is between 80-100cm, and height is between 200-400cm.Above-mentioned go up arc guide, in lead, lead down and the construction length of inverted arch be the applicant on the theory analysis basis of force structure, summary of experience gets through long-term practice, has very strong directive significance in practice of construction, guarantees construction safety.Expanding by single-track tunnel when scraping out double track tunnel, can carry out part or full section by designing requirement and expand and dig.

Described to arc guide on the former single line, in the support system of leading and leading down when carrying out dividing elements, the dividing line place in each unit adopts artificial pneumatic pick raggle, the reinforcing bar that will expose, ductule, steel bow member blow with oxygen welding and get final product.

Describedly expand and all adopt the microseismic activity blasting procedure to carry out when digging removing former single line support system and two-wire, in strict accordance with microseismic activity blasting procedure design hole, powder charge, line, the design principles of described microseismic activity blasting procedure is that those of ordinary skill in the art knows, and can do suitable adjustment according to the country rock actual conditions.Two-wire expands the smooth blasting method that can adopt when digging in the microseismic activity blasting procedure.

Compared with prior art, the present invention has the following advantages:

1. adopt three benching tunnelling methods to carry out two-wire and expand and to dig, successfully solved single line and changed two-wire and expand and dig difficulty, cause this difficult problem of Tunnel Landslide easily;

2. change two-wire according to single line and expand and to dig the former single-track tunnel support system of dividing elements, the paragraph and the position that are about to construction are decomposed, explosion is removed it a little less than taking then, has effectively avoided striding the phenomenon of collapsing because of the former single line support system large tracts of land that causes that is implicative of each other;

3. make full use of the free face that the single-track tunnel profile forms, when expansion is dug, adopt the microseismic activity blasting procedure, effectively avoided country rock disturbance and the unstability that the causes phenomenon of caving in repeatedly;

4. realized tunnel single lines such as railway, highway change two-wire fast, safe construction, month progress reaches 120m the soonest, through facts have proved, a landslide accident does not take place in the work progress of using this job practices, has created good economic benefit and social benefit simultaneously yet.

Description of drawings

Fig. 1 is a working procedure schematic diagram of the present invention

Fig. 2 arranges schematic diagram for headroom in the monitoring measurement process of the present invention changes measuring point

The specific embodiment

One side of digging single-track tunnel with expansion is an example, and job practices of the present invention is described in detail:

A kind of tunnel single line changes the job practices of two-wire, may further comprise the steps:

(1) along double track tunnel arch excavation outline line, carry out the ductule advance support: adopt air rock drill along the excavation outline line boring of double track tunnel arch, leading ductule is installed behind the pore-forming, form only slurry dish along ductule deployment line sprayed mortar, adopt KBY50/70 grouting pump pressure injection cement mortar (water/binder ratio 1:1, aggregate-to-cement ratio 2:1), pressure is not less than 1MPa, and grouting process is undertaken by design and job specfication.

(2) will go up the preliminary bracing of arc guide single line according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements; dividing line place in each unit; adopt artificial pneumatic pick raggle; the reinforcing bar that will expose, ductule, steel bow member blow with oxygen welding; form independently junior unit; be base unit with each unit then; under the advance support protection, carry out arc guide support system decomposition dismounting on the former single line; carry out the two-wire expansion at last and dig and perform preliminary bracing; each construction length must not surpass a Pin bow member; i.e. 80~100cm, concrete steps are as follows:

The first step, decompose to remove on the former single line 1. portion of arc guide support system, to go up the preliminary bracing of arc guide single line according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, method is the same, forms each independently junior unit, takes the microseismic activity blasting procedure that it is removed again; Arc guide A portion on the two-wire is dug in second step, expansion, adopts the microseismic activity blasting procedure to expand and digs; The 3rd goes on foot, performs arc guide preliminary bracing I portion on the two-wire;

(3) treating that arc guide expands to dig behind leading 3~5m leads construction in the beginning, in lead when construction according to benching tunnelling method construction shoulder height and cyclic advance will in lead the single line preliminary bracing and carry out dividing elements, method is the same, be base unit with each unit then, decompose dismounting with leading support system in the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, in lead the staggered construction in the left and right sides, the successively staggered 2m that is not less than, each construction length must not surpass two Pin bow members, i.e. 160~200cm, concrete steps are as follows:

The first step, decompose to remove in the former single line left side and lead 2. portion of support system, according to benching tunnelling method construction shoulder height and cyclic advance will in lead single line Zhi Jinhang dividing elements just, method is the same, takes the microseismic activity blasting procedure that it is removed again; Second step, expansion are dug and are led B portion in the two-wire left side, adopt the microseismic activity blasting procedure to expand and dig; The 3rd goes on foot, performs and lead preliminary bracing II portion in the two-wire left side; The 4th step, decompose to remove in the single line right side and lead 3. portion of support system, according to benching tunnelling method construction shoulder height and cyclic advance will in lead single line Zhi Jinhang dividing elements just, method is the same, takes the microseismic activity blasting procedure that it is removed again; The 5th goes on foot, performs and lead preliminary bracing III portion in the two-wire right side;

(4) lead in treating to expand to dig and lead construction under beginning behind leading 3~5m, under lead when construction and will lead the single line preliminary bracing down according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, method is the same, is base unit with each unit then, decomposes dismounting with leading support system under the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, under lead the staggered construction in the left and right sides, successively staggeredly be not less than 2m, the length of at every turn constructing must not surpass two Pin bow members, i.e. 160~200cm, concrete steps are as follows:

The first step, decompose to remove the single line lower-left and lead 4. portion of support system, according to benching tunnelling method construction shoulder height and cyclic advance will in lead single line Zhi Jinhang dividing elements just, method is the same, takes the microseismic activity blasting procedure that it is removed again; Second step, expansion are dug the two-wire lower-left and are led C portion, adopt the microseismic activity blasting procedure to expand and dig; The 3rd step, perform the two-wire lower-left and lead preliminary bracing IV portion; The 4th step, decompose to remove the single line bottom right and lead 5. portion of support system, according to benching tunnelling method construction shoulder height and cyclic advance will in lead single line Zhi Jinhang dividing elements just, method is the same, takes the microseismic activity blasting procedure that it is removed again; The 5th step, perform the two-wire bottom right and lead preliminary bracing V portion;

(5) repeat above-mentioned four steps, when barrel expands when digging leading 20~30m, the construction of beginning inverted arch is removed former single line inverted arch and is expanded and dig, and inverted arch is once removed construction length must not surpass 6m; When inverted arch is constructed leading 60~80m, the two-wire secondary lining that begins to construct, concrete construction sequence is as follows:

The first step, the former single line inverted arch of demolition blasting be portion 6.;

Two-wire inverted arch D portion is dug in second step, expansion;

The 3rd step, perform two-wire inverted arch VI portion, perform the inverted arch supporting by two-wire requirements, the inverted arch concrete will in time apply, and makes support system be closed into ring as early as possible, and is whole stressed, guarantees that supporting and protection structure stablizes.Adopt portable trestle to carry out the inverted arch concrete construction;

The 4th goes on foot, performs two-wire secondary lining VII portion, carries out the setting of reinforcement installation, waterproofing course laying and all kinds of built-in fitting, preformed hole, ditch, groove, pipeline before the concrete placing by designing requirement;

Constantly circulate according to above-mentioned steps, realize that the tunnel single line changes the excavation of two-wire.

In above-mentioned activities, control measurement work must be immediately following excavation, the supporting operation is layouted and monitor, and metric data application engineering analogy method is in time analyzed, fed back, and adjusts supporting parameter, to guarantee construction and structural safety:

As shown in Figure 2, measure section every one of 10m cloth, each section arranges that a vault deflection measuring point E and two horizontal clearance convergences measure baseline L 1, L 2,

The headroom horizontal convergence measures and vault sinks to measuring and adopts identical measurement frequency, measure frequency and see the following form, the actual amount measured frequency from table according to rate of strain and apart from excavated surface apart from selecting a higher measurement frequency,

Measure frequency meter

Horizontal convergence measures and adopts the laser profiler to measure, and measuring point and numbering are installed rapidly behind the excavation on request, reads initial reading behind excavation in the 12h.Vault sinks to measuring to adopt laser profiler and precision level, convergence gauge to measure, and sets up an office at vault rapidly behind the sprayed mortar.

Claims (3)

1, a kind of tunnel single line changes the job practices of two-wire, it is characterized in that may further comprise the steps:
(1) along double track tunnel arch excavation outline line, carries out the ductule advance support;
(2) will go up the preliminary bracing of arc guide single line according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, form independently junior unit, be base unit with each unit then, under the advance support protection, carry out arc guide support system decomposition dismounting on the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, each construction length must not surpass Pin bow member, i.e. a 80~100cm;
(3) treating that arc guide expands to dig behind leading 3~5m leads construction in the beginning, in lead when construction according to benching tunnelling method construction shoulder height and cyclic advance will in lead the single line preliminary bracing and carry out dividing elements, be base unit with each unit then, decompose dismounting with leading support system in the former single line, carry out two-wire at last and expand and to dig and to perform preliminary bracing, in lead the staggered construction in the left and right sides, the successively staggered 2m that is not less than, each construction length must not surpass two Pin bow member, i.e. 160~200cm;
(4) lead in treating to expand to dig and lead construction under beginning behind leading 3~5m, under lead when construction and will lead the single line preliminary bracing down according to benching tunnelling method construction shoulder height and cyclic advance and carry out dividing elements, be base unit with each unit then, decompose dismounting with leading support system under the former single line, carry out the two-wire expansion at last and dig and perform preliminary bracing, lead the staggered construction in the left and right sides down, the successively staggered 2m that is not less than, each construction length must not surpass two Pin bow member, i.e. 160~200cm;
(5) repeat above-mentioned four steps, when barrel expands when digging leading 20~30m, the construction of beginning inverted arch is removed former single line inverted arch and is expanded and dig, and inverted arch is once removed construction length must not surpass 6m; When inverted arch is constructed leading 60~80m, the two-wire secondary lining that begins to construct,
Constantly circulate according to above-mentioned steps, realization tunnel single line changes the expansion of two-wire and digs.
2, a kind of tunnel according to claim 1 single line changes the job practices of two-wire, it is characterized in that to arc guide on the former single line, in the support system of leading and leading down carry out dividing elements, dividing line place in each unit, adopt artificial pneumatic pick raggle, the reinforcing bar that will expose, ductule, steel bow member blow with oxygen welding and get final product.
3, a kind of tunnel according to claim 1 and 2 single line changes the job practices of two-wire, it is characterized in that expanding and all adopting the microseismic activity blasting procedure to carry out when digging removing former single line support system and two-wire.
CNA2008100794867A 2008-09-26 2008-09-26 Construction method for changing single line to be double in tunnel CN101363322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008100794867A CN101363322A (en) 2008-09-26 2008-09-26 Construction method for changing single line to be double in tunnel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008100794867A CN101363322A (en) 2008-09-26 2008-09-26 Construction method for changing single line to be double in tunnel

Publications (1)

Publication Number Publication Date
CN101363322A true CN101363322A (en) 2009-02-11

Family

ID=40389895

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2008100794867A CN101363322A (en) 2008-09-26 2008-09-26 Construction method for changing single line to be double in tunnel

Country Status (1)

Country Link
CN (1) CN101363322A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102521A (en) * 2010-12-29 2011-06-22 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN102121385A (en) * 2011-03-18 2011-07-13 同济大学 Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel
CN102852525A (en) * 2012-09-29 2013-01-02 中铁二局股份有限公司 Underground tunnel enlarging and excavating method from small section of single-line tunnel to large section of double-line tunnel
CN102865084A (en) * 2012-09-29 2013-01-09 中铁二局股份有限公司 Expanding excavation method of underground tunnel from fracture surface of double-track tunnel to ultra-large fracture surface of triple-track tunnel
CN103306680A (en) * 2013-03-23 2013-09-18 中铁二院工程集团有限责任公司 Construction method for extending single-track tunnel to multi-track tunnel
CN105004732A (en) * 2015-07-16 2015-10-28 武汉长盛工程检测技术开发有限公司 Tunnel crack rapid detection device and method
CN105952464A (en) * 2016-05-27 2016-09-21 宁波市交通规划设计研究院有限公司 A mountain tunnel reconstruction expanding excavation construction method
CN107060772A (en) * 2017-03-23 2017-08-18 中铁五局集团成都工程有限责任公司 Large section construction method is mutated for Line for Passenger Transportation standard section
CN108397200A (en) * 2018-01-29 2018-08-14 中建市政工程有限公司 Formula construction method is done after metro station tunnel linkage segment structure
CN109268016A (en) * 2018-08-31 2019-01-25 中铁十七局集团第三工程有限公司 Dovetail type method for tunnel construction

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102521A (en) * 2010-12-29 2011-06-22 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN102102521B (en) * 2010-12-29 2012-11-28 上海浦东工程建设管理有限公司 Method for broadening and rebuilding soft soil shallow tunnel in operation state
CN102121385A (en) * 2011-03-18 2011-07-13 同济大学 Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel
CN102121385B (en) * 2011-03-18 2012-12-05 同济大学 Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel
CN102852525A (en) * 2012-09-29 2013-01-02 中铁二局股份有限公司 Underground tunnel enlarging and excavating method from small section of single-line tunnel to large section of double-line tunnel
CN102865084A (en) * 2012-09-29 2013-01-09 中铁二局股份有限公司 Expanding excavation method of underground tunnel from fracture surface of double-track tunnel to ultra-large fracture surface of triple-track tunnel
CN102865084B (en) * 2012-09-29 2014-09-03 中铁二局股份有限公司 Expanding excavation method of underground tunnel from fracture surface of double-track tunnel to ultra-large fracture surface of triple-track tunnel
CN103306680A (en) * 2013-03-23 2013-09-18 中铁二院工程集团有限责任公司 Construction method for extending single-track tunnel to multi-track tunnel
CN103306680B (en) * 2013-03-23 2015-09-30 中铁二院工程集团有限责任公司 Existing single-track tunnel enlarging is the construction method of multiple track tunnel
CN105004732A (en) * 2015-07-16 2015-10-28 武汉长盛工程检测技术开发有限公司 Tunnel crack rapid detection device and method
CN105952464A (en) * 2016-05-27 2016-09-21 宁波市交通规划设计研究院有限公司 A mountain tunnel reconstruction expanding excavation construction method
CN105952464B (en) * 2016-05-27 2018-07-06 宁波市交通规划设计研究院有限公司 A kind of massif tunnel reconstruction Enlargement excavation method
CN107060772A (en) * 2017-03-23 2017-08-18 中铁五局集团成都工程有限责任公司 Large section construction method is mutated for Line for Passenger Transportation standard section
CN108397200A (en) * 2018-01-29 2018-08-14 中建市政工程有限公司 Formula construction method is done after metro station tunnel linkage segment structure
CN109268016A (en) * 2018-08-31 2019-01-25 中铁十七局集团第三工程有限公司 Dovetail type method for tunnel construction

Similar Documents

Publication Publication Date Title
CN102121395B (en) Method for integrated comprehensive management of gas in low-permeability single coal bed
CN101614125B (en) Construction method of V-level surrounding rock tunnel
Hoek Support for very weak rock associated with faults and shear zones
CN102562075B (en) Large cross-section weak surrounding rock tunnel three-step and six-part short-distance construction method
CN103089275B (en) Control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections
CN104612698B (en) A kind of shallow-depth-excavation tunnel top bar interval wall construction method
CN102493822B (en) Method for performing curtain grouting construction on tunnel by water rich fault influence zone
CN106837352A (en) Fault belt surrounding rock tunnel construction method
CN105092816B (en) Three-dimensional multi-coal-seam-mining similar material model experimental system
CN101440708B (en) PBA shallow buried underground excavating close range large section three-hole separated island type structure construction method
CN101761346B (en) Method for constructing metamorphic rock confined water tunnel
CN101967985B (en) Self-propelled inverted arch template construction method
Jiao et al. Improvement of the U-shaped steel sets for supporting the roadways in loose thick coal seam
CN105401947B (en) The large deformation of high-ground stress Support System in Soft Rock Tunnels controls construction method
CN103375170B (en) Underground excavation construction deformation control method for three-hole small clear distance tunnel underpass trunk railway
CN101864963B (en) Large-section loess tunnel construction method
CN102071940B (en) Construction method for mine shaft through multilayer goaf
CN104564128B (en) A kind of shallow-depth-excavation tunnel construction deformation monitoring method
CN103161480B (en) Initiatively support the method for roadside packing gob side entry retaining
EP2801697B1 (en) Longwall working face, non-pillared mining method
CN101798930B (en) Rapid construction method of high-pressure water-rich fault zone of tunnel
CN103016053B (en) Method of local filling to control surface subsidence in gob
CN101994513B (en) Method for constructing tunnel by finishing full section curtain grouting from upper-half section
CN102226403B (en) Construction method of large-span subway station main body by using arched cover method and station main body structure
CN102606162B (en) Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
WD01 Invention patent application deemed withdrawn after publication

Open date: 20090211

C02 Deemed withdrawal of patent application after publication (patent law 2001)