CN1837506B - Construction method for excavating box-shape structure over an operating tunnel - Google Patents

Construction method for excavating box-shape structure over an operating tunnel Download PDF

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Publication number
CN1837506B
CN1837506B CN2006100256530A CN200610025653A CN1837506B CN 1837506 B CN1837506 B CN 1837506B CN 2006100256530 A CN2006100256530 A CN 2006100256530A CN 200610025653 A CN200610025653 A CN 200610025653A CN 1837506 B CN1837506 B CN 1837506B
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China
Prior art keywords
tunnel
base plate
district
enclosure wall
support
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CN2006100256530A
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Chinese (zh)
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CN1837506A (en
Inventor
王海燕
潘松林
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上海市政工程设计研究总院
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Publication of CN1837506A publication Critical patent/CN1837506A/en
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Publication of CN1837506B publication Critical patent/CN1837506B/en

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Abstract

The invention relates to a method for constructing the box above the tunnel, which is characterized in that: arranging protective walls 1 and 2 at the basic hole which can divide the soil above the tunnel into three sections as I, II, and III; then strengthening the soil around the tunnel; digging at I and III sections to bottom plate and arranging steel support, then processing the bottom plate,middle plate, side plate and side wall, with keeping the steep support; in II section, digging the soil to the bottom plate and arranging steel support, and connecting the bottom plate to the bottom plates of I and III sections; removing the first support of II section, and removing part of protective wall 1, and processing the top plate of II section; removing the second support of II section, and part of protective wall 1, processing the middle plate of II section; removing the third support, removing left protective wall 1, and filling soil into ground. The invention can quickly construct a new box structure above the tunnel without affecting the normal operation of tunnel.

Description

A kind of job practices of the tunnel upper excavation box structure in operation

Technical field:

The present invention relates to the underground engineering construction technical field, specifically a kind of tunnel upper in operation is through the construct job practices of box structure of the mode of excavation section by section.

Background technology:

In recent years, along with the growing interest of Shanghai to underground space resources, building the tunnel becomes a kind of effective form that utilizes the underground space to improve traffic above-ground.It is for improving land utilization efficiency, alleviate traffic above-ground, improve the human residential environment, realize people's car three-dimensional branching off, reduce environment pollution, keeping urban history cultural landscape etc. all to have very significant effect.But the underground space in city is limited.Because Shanghai City lacked comprehensive planning to the exploitation in underground space, made that the underground space of bustling center is very crowded in the past, the underground space that reality can supply develop is very limited.Along with the development of urban underground space, run into the situation that newly-built underground structure need pass through tunnel in the operation of having built up through regular meeting.All there is the problem of building subterranean tunnel of passing through in comprehensive reformation projects such as the outbeach that will implement at present, Xujiahui, Jing'an Monastery.

Summary of the invention:

The object of the present invention is to provide a kind of tunnel upper in operation through the construct job practices of new box structure of the mode of excavation section by section, it can overcome the deficiency of the normal operation of established tunnel during the new box structure that can't guarantee in the prior art to construct.

To achieve these goals; Technical scheme of the present invention is: a kind of job practices of the tunnel upper excavation box structure in operation; It mainly comprises the foundation ditch of the box structure that is arranged on tunnel upper; It is characterized in that: described job practices comprise following step: a, the box structure that will excavate constitute by base plate, middle plate, top board and side wall; Second enclosure wall 2 that is parallel to the tunnel is set on the foundation ditch limit earlier, in foundation ditch, is provided with perpendicular to first enclosure wall, 1, the second enclosure wall 2 in tunnel and first enclosure wall 1 intersects vertically and the soil body of tunnel upper is divided into I district, II district and III district; B, the tunnel surrounding soil is reinforced; C, in the I district, the III district cuts the earth to the base plate position and steel is set supports, the base plate of constructing then, base plate reinforcing bar adopt with the cross section and break off, and are embedded in the base plate, then construction is accomplished in I, the III district plate, top board and sidewall structure and is kept the steel support; Cut the earth to the base plate position and steel are set and support in d, II district, construction II district's base plate also is communicated with I, III district base plate; E, dismounting first road, II district support, and cut part first enclosure wall (1), construction II district top board; Remove second road, II district and support, cut part, plate in the construction II district; Remove the 3rd road and support, cut remainder first enclosure wall (1), backfill is to ground.

Of the present inventionly disclose a kind of tunnel upper in operation, can guarantee under the situation of the normal operation of established tunnel the new box structure of above established tunnel, constructing safely and fast through the construct job practices of new box structure of the mode of excavation section by section.

Description of drawings:

Fig. 1 is a space enclosing structure layout plan of the present invention

Fig. 2 is a soil stabilization layout plan of the present invention

Fig. 3 is an A-A sectional schematic diagram among Fig. 2

Fig. 4 is a Construction Arrangement sketch map of the present invention

The specific embodiment:

Below in conjunction with accompanying drawing and embodiment the present invention is done further description.

The present invention mainly comprises the foundation ditch of the box structure that is arranged on tunnel upper; It is characterized in that: described job practices comprise following step: a, the box structure that will excavate constitute by base plate, middle plate, top board and side wall; Second enclosure wall 2 that is parallel to the tunnel is set on the foundation ditch limit earlier; In foundation ditch, be provided with perpendicular to first enclosure wall, 1, the second enclosure wall 2 in tunnel and first enclosure wall 1 intersects vertically and the soil body of tunnel upper is divided into I district, II district and III district; B, the tunnel surrounding soil is reinforced; C, in the I district, the III district cuts the earth to the base plate position and steel is set supports, the base plate of constructing then, base plate reinforcing bar adopt with the cross section and break off, and are embedded in the base plate, then construction is accomplished in I, the III district plate, top board and sidewall structure and is kept the steel support; Cut the earth to the base plate position and steel are set and support in d, II district, construction II district's base plate also is communicated with I, III district base plate; E, dismounting first road, II district support, and cut part first enclosure wall 1, construction II district top board; Remove second road, II district and support, cut part first enclosure wall 1, plate in the construction II district; Remove the 3rd road and support, cut remainder first enclosure wall 1, backfill is to ground.

As shown in Figure 1; Excavation of the present invention go along with sb. to guard him system by the foundation ditch limit perpendicular in the bored pile of established tunnel, the foundation ditch perpendicular to the bored pile (first enclosure wall 1) in tunnel and be parallel to limit, hole, tunnel (with the distance on limit, tunnel be 4 meters) diaphragm wall (second enclosure wall 2) form, the top of bored pile, diaphragm wall is provided with the concrete capping beam; The tunnel upper soil body is divided into 3 districts (I district, II district and III district) " piecemeal, symmetry, layering " construction.

For the stability that guarantees foundation ditch and the safety of operation tunnel, the fender post directly over the tunnel (space enclosing structure 1) degree of depth is top mark height top, tunnel 750mm.Hole internal drilling castinplace pile in the altitude range of newly-built box structure base plate~middle plate, inserts 200 * 200H shaped steel so that use during the construction of II district base plate.

As shown in Figure 2, all to reinforce inside and outside the foundation ditch before the excavation of foundation pit with SMW worker's method stake (being cement mixing method), the scope of reinforcing is in the whole foundation ditch and goes along with sb. to guard him in 7 meters in the outside.Soil stabilization must be carried out in two angular regions of tunnel upper semicircumference, and the concrete vertical scope of reinforcing is seen the A-A profile among Fig. 3.Cement mixing method is grid and arranges.In order to guarantee the safe operation in tunnel, the speed of application of SMW is controlled in strictness, and the soil pressure that produces when reducing to construct is to the influence in tunnel.The sequence of construction of soil stabilization should be carried out according to the tunnel is influenced minimum principle, and the order of " near earlier back far " is carried out promptly apart from the tunnel.Reinforcement material is selected the cement mortar of C20 for use; The hole inner bottom plating adopts 8% cement mixing content during with the soil stabilization on top; Base plate adopts 20% cement mixing content with down to the soil stabilization of established tunnel base section the time, and the outer soil stabilization of foundation ditch adopts 13% cement mixing content, and is as shown in Figure 3.

Concrete working procedure is:

At tunnel upper subregion piecemeal excavation, as shown in Figure 4.At first in the I district, the III district cuts the earth.Because the restriction of established tunnel buried depth, the insertion depth of space enclosing structure 1 maybe be not enough, can cut the earth to certain depth, and except that applying the steel support, the glass fiber anchor cable of constructing is again kept the stable of space enclosing structure.The glass fiber anchor cable is that a kind of resistance to tension is very strong but new material that shear resistance is not enough, both can guarantee the stability gone along with sb. to guard him, and after construction finishes, staying in the soil not to be influenced follow-up construction and exploitation by sliding trackle easily.

I district, the III district soil body are excavated the base plate of constructing to the base plate position, and the base plate bar splice is adopted between mechanical connection manner and the adjacent bottom plates and is connected, and bar splice is adopted with the cross section and broken off, and is embedded in this base plate, and joint must be protected and put in place.Treat that casting and compacting of concrete finishes back (before the concrete initial set), completely be layered on the base plate face back load application (sand pocket) on clamping plate immediately with clamping plate.I, the base plate shoveling of III district, base plate and total engineering time of load application were controlled in 24 hours.Adopt conventional method to carry out the construction of middle plate, top board and sidewall structure afterwards.After structure forms, support and do not remove (the support load transfering strip when constructing) as the II district.

After I district, the construction of III district are accomplished, excavation II district.II district soil excavation and the same I of support job practices, III district.Before the base plate construction of II district, the concrete chisel removal, the reinforcing bar that need will cheat in the internal drilling castinplace pile base plate boundary of works area cut off, and 200 * 200H shaped steel is exposed, and utilize H shaped steel directly to go up the top castinplace pile, and i iron welds steel plate for sealing water on base plate plane.Pre-buried reinforcing steel bar machinery joint links to each other in the middle reinforcing bar of base plate and I, the III district; Because to have I, III district embedded bar joint be same direction of rotation and can't adopt two-way mechanical connecting joint, so must adopt one joint form to give the reinforcing bar connection in the middle of the base plate.There is vertical constuction joint between II district base plate and the adjacent bottom plates.In base plate when construction in the II district, is with the fixing middle part of I, III three district's base plate constuction joints of water-swelling rubber water bar.

Base plate construction in II district than I, the III content of constructing more, and therefore, this piece base plate shoveling, base plate and total engineering time of load application were controlled in 48 hours.

After the base arrangement construction of II district is accomplished, remove first road, II district and support, cut and separate at the bottom of bored pile to the top board, construction II district top board; Remove second road, II district and support, cut and separate at the bottom of bored pile to the middle plate, plate in the construction II district; Remove the 3rd road and support, cut all the other and separate bored pile.

Will there be strict protection and the formulation emergency preplan of speedily carrying out rescue work construction period to established tunnel and multiple line thereof; Major measure is following: strengthen monitoring; Strengthen the monitoring of this section ground deformation and sedimentation on the one hand; Increase frequency, organize on the other hand for East Road, Yan'an cross-river tunnel and be out of shape the monitoring with sedimentation, in time obtain tunnel deformation information.Optimize construction organization and technology, reduce influence for East Road, Yan'an cross-river tunnel from construction technology.And accomplish fluently injected hole in advance, as the emergency management and rescue measure of protection East Road, Yan'an cross-river tunnel.In case the generation dangerous situation, tissue carries out rescue immediately.

Claims (5)

1. the job practices of the tunnel upper excavation box structure in operation; It mainly comprises the foundation ditch of the box structure that is arranged on tunnel upper; It is characterized in that: described job practices comprise following step: a, the box structure that will excavate constitute by base plate, middle plate, top board and side wall; Second enclosure wall (2) that is parallel to the tunnel is set on the foundation ditch limit earlier; First enclosure wall (1) perpendicular to the tunnel is set in foundation ditch, and second enclosure wall (2) and first enclosure wall (1) intersect vertically and the soil body of tunnel upper are divided into I district, II district and III district, and direction is arranged in order along the tunnel for I district, II district and III district; B, the tunnel surrounding soil is reinforced; C, in the I district, cutting the earth to the base plate position in the III district and by layer steel is set supports, the base plate of constructing then, base plate reinforcing bar adopt with the cross section and break off, and are embedded in the base plate, then construction is accomplished in I, the III district plate, top board and sidewall structure and is kept the steel support; Cut the earth to the base plate position and by layer steel are set and support in d, II district, construction II district's base plate also is communicated with I, III district base plate; E, dismounting first road, II district support, and cut part first enclosure wall (1), construction II district top board; Remove second road, II district and support, cut part first enclosure wall (1), plate in the construction II district; Remove the 3rd road and support, cut remainder first enclosure wall (1), backfill is to ground.
2. the job practices of a kind of tunnel upper excavation box structure in operation according to claim 1; It is characterized in that: in a step; Described second enclosure wall (2) is that 4 meters diaphragm wall constitutes by the distance with the limit, tunnel; First enclosure wall (1) is made up of bored pile, and second enclosure wall (2) and first enclosure wall (1) link together the distance from bottom tunnel top 700-800mm of first enclosure wall (1) and second enclosure wall (2) in position, wall top through the concrete capping beam.
3. the job practices of a kind of tunnel upper excavation box structure in operation according to claim 1; It is characterized in that: the tunnel surrounding soil is reinforced described in the b step is meant and utilizes cement mixing pile that the established tunnel surrounding soil is reinforced; Reinforcement material is selected the cement mortar of C20 for use; The sequence of construction of soil stabilization should be carried out according to order far away after near earlier apart from the tunnel; Foundation ditch inner bottom plating position is adopted 8% cement mixing content during with the soil stabilization on top, and 20% cement mixing content is adopted with down to the soil stabilization of tunnel bottom part the time in the base plate position, and the outer soil stabilization of foundation ditch adopts 13% cement mixing content.
4. the job practices of a kind of tunnel upper excavation box structure in operation according to claim 1 is characterized in that: in the c step, behind the construction base plate; The base plate bar splice is adopted between mechanical connection manner and the adjacent bottom plates and is connected; Bar splice is adopted with the cross section and is broken off, and is embedded in this base plate, and bar splice is protected; Treat after casting and compacting of concrete finishes to be before the concrete initial set; Completely be layered on the base plate face with clamping plate immediately, back load application on clamping plate, I, the base plate shoveling of III district, base plate and total engineering time of load application were controlled in 24 hours.
5. the job practices of a kind of tunnel upper excavation box structure in operation according to claim 1 is characterized in that: in c and the d step, outside the installation steel of cutting the earth supports, install the glass fiber anchor cable again additional.
CN2006100256530A 2006-04-12 2006-04-12 Construction method for excavating box-shape structure over an operating tunnel CN1837506B (en)

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CN1837506B true CN1837506B (en) 2012-02-15

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CN101413235B (en) * 2008-11-25 2011-11-30 中国一冶集团有限公司 Method for reinforcing railway before paving railway rail construction under underground way bridge
CN101748758B (en) * 2008-12-04 2012-03-21 中国二十冶集团有限公司 Timbering method of foundation ditches for reforming on-line equipment foundations in factory buildings
CN101768979B (en) * 2009-12-31 2011-06-08 上海市隧道工程轨道交通设计研究院 Enclosure structure with ultrashort underground wall
CN101781889B (en) * 2010-01-29 2014-10-08 中铁四局集团第五工程有限公司 H-shaped waterproof curtain construction process
CN102678127B (en) * 2011-03-09 2014-07-30 董勤银 Method for constructing weakly consolidated non-stratified sandstone tunnel
AP201407534A0 (en) * 2011-09-27 2014-03-31 Maurice Garzon Method for forming a retaining wall, and corresponding retaining wall
CN103590404B (en) * 2012-08-13 2016-04-27 上海市政工程设计研究总院(集团)有限公司 A kind of foundation ditch method for supporting being close to built underground structure
CN103225307B (en) * 2013-04-08 2014-12-24 广东省基础工程公司 Construction method for dynamic steel supporting system of deep foundation pit
CN103590406A (en) * 2013-11-29 2014-02-19 中船第九设计研究院工程有限公司 Construction method for synchronously excavating ultra-large type deep foundation pits in partitioned mode
CN104131816B (en) * 2014-06-20 2019-02-12 上海建工五建集团有限公司 The construction method in subway tunnel subterranean wall enabling hole in a kind of operation
CN104099944B (en) * 2014-07-24 2015-12-30 武汉市汉阳市政建设集团公司 The construction method of subway station and large span accessory structure interface
CN104947681B (en) * 2015-07-07 2017-05-10 中建三局第二建设工程有限责任公司 Super large super deep basement ground pit construction method
CN105484268A (en) * 2015-11-24 2016-04-13 上海建工一建集团有限公司 Construction method of bottom plate of foundation pit

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