CN101824823B - Construction method of enclosure structure with ultra-short underground walls - Google Patents

Construction method of enclosure structure with ultra-short underground walls Download PDF

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Publication number
CN101824823B
CN101824823B CN2009103129206A CN200910312920A CN101824823B CN 101824823 B CN101824823 B CN 101824823B CN 2009103129206 A CN2009103129206 A CN 2009103129206A CN 200910312920 A CN200910312920 A CN 200910312920A CN 101824823 B CN101824823 B CN 101824823B
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China
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ultra
short
construction
underground walls
shield
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CN101824823A (en
Inventor
陈鸿
解蕾
唐冬梅
冯云
叶蓉
季应伟
奚程磊
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Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
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Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
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Abstract

The invention relates to a foundation pit project in the civil transportation construction industry, in particular to a construction method of an enclosure structure with ultra-short underground walls, wherein the enclosure structure is used for a foundation pit therebelow which is used for the construction of leading a tunnel to pass through a shield zone, and the method comprises the following steps: carrying out trench forming construction according to the size of each pair of the ultra-short underground walls to be constructed, wherein the bottom of the dug trench section is positioned not less than 0.5m above the top of a shield; then hoisting and placing a steel bar cage and filling concrete in the trench section for constructing the pair of the ultra-short underground walls; further carrying out the trench forming construction between the ultra-short underground walls for constructing the trench section which is vertical to the ultra-short underground walls, wherein the bottom of the trench section is leveled with the bottom of the trench section of the ultra-short underground walls; and hoisting and placing the steel bar cage and filling the concrete in the trench section for constructing transverse underground wall short walls. The construction method has the advantage of ensuring the smooth passing through of the shield at later stage; compared with the traditional practice of leading the shield to pass through glass fiber bar underground walls, the shield does not need to pass through the underground walls, thereby reducing the project risk and the cost.

Description

Construction method of enclosure structure with ultra-short underground walls
Technical field
The present invention relates to building transportation building industry base pit engineering, be specifically related to a kind of job practices that its below is carried out the foundation ditch of shield structure running tunnel crossing construction, had the space enclosing structure of ultra-short underground walls that is used for.
Background technology
In urban traffic was built, after tending to occur ground excavation foundation ditch structure and building up, the situation of shield structure running tunnel crossing construction was carried out in its below.The construction of foundation ditch relates generally to the space enclosing structure around it: the steel concrete diaphragm wall of cast in situs, and usually in order to ensure the requirements such as monolithic stability of foundation ditch during the excavation, the insertion ratio of subterranean wall is generally greater than 0.7.Tunnel machine will need to bore subterranean wall when in other words, the tunnel crossing construction is carried out in its below.Though shield machine can cut the fragility material of weak concrete class, then be difficult to bore saturating for reinforced concrete structure.
The deep foundation ditch of in the past reserving the interval through section of subway is as reviving East Road construction of tunnel etc., all consider to adopt special width of cloth subterranean wall in the design: be about to the through section subterranean wall and be designed to and reserve the circuit quadrature, and the shield structure passes through the alternative plain bars of district's subterranean wall employing glass fiber muscle (GFRP) equal strength under the hole, substitute intrinsic C30 concrete with the C10 concrete, shield machine is cutting fibre muscle and weak concrete directly, and adding in the solid under the hole normally passed through.Because No. 12 line shield tunnels of subway with this engineering oblique angle is big, scope is long, if adopt such scheme, need to guarantee shield machine and wait to pass through the subterranean wall quadrature, cause that thus the foundation ditch planar range strengthens, and increase the removal amount of moving, the construction investment increase.Nonetheless, from existing engineering construction experience, later stage shield structure cutting is passed through subterranean wall and is still had big construction risk.
Therefore the design of the space enclosing structure of through section must be considered the cutting power of shield machine, takes measures to reduce to wear under No. 12 lines of subway the engineering risk of outbeach passage, guarantees the smooth implementation of No. 12 lines of subway.
At guaranteeing the construction condition that the shield structure passes through and the concrete characteristics of through section; through the through section scheme is discussed extensively and profoundly; having proposed through section space enclosing structure type selecting designs by following principle: shorten through section space enclosing structure insertion depth; guarantee security of foundation ditch construction by technical measures, to reduce the risks of construction of No. 12 lines of subway.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of construction method of enclosure structure with ultra-short underground walls is provided, this construction method of enclosure structure with ultra-short underground walls is not less than 0.5m and sentences shield machine can be passed from its below by the toe of wall of subterranean wall being located at top, shield structure top, and the short wall of horizontal subterranean wall is set between the every pair of subterranean wall in foundation ditch both sides supports, with the horizontal movement of subterranean wall direction in the hole during the constraint excavation of foundation pit, guarantee passing through smoothly of later stage shield structure.
The object of the invention realizes being finished by following technical scheme:
A kind of construction method of enclosure structure with ultra-short underground walls, this method are used for the base pit engineering that the shield driven tunnel crossing construction is carried out in its below, and it is characterized in that: this method has following steps:
A) carry out trenching construction according to the size of every pair of ultra-short underground walls yet to be built, the groove section bottom of being dug should be positioned at top, shield structure top and be not less than the 0.5m place;
B) install reinforcing cage and concrete perfusion in the formed groove section of step a) are to make up a pair of described ultra-short underground walls;
C) form in step b) and carry out trenching construction between the ultra-short underground walls once more, to constitute the groove section perpendicular to described ultra-short underground walls, described groove section bottom is concordant bottom ultra-short underground walls groove section;
D) install reinforcing cage and concrete perfusion in the formed groove section of step c) are to make up the short wall of horizontal subterranean wall.
This method also includes the step that the shaped steel cement mixing method is set outside foundation ditch after step d), pull out shaped steel after finishing main structure construction.
This method adopts full section rotary jet strengthening at the bottom of the hole of shield structure through section after step d).
The bottom that adds solid that described rotary jet strengthening produced flushes with the toe of wall of the short wall of described subterranean wall.
The two ends of digging the groove section of establishing in the step c) lay respectively at the centerline of two ultra-short underground walls length directions.
Advantage of the present invention is: can guarantee passing through smoothly of later stage shield structure, pass through glass fiber muscle subterranean wall with traditional shield structure and compare that the shield structure need not to pass through subterranean wall, has reduced engineering risk and cost.
Description of drawings
Fig. 1 is an embodiment of the invention through section space enclosing structure plan view;
Fig. 2 is an embodiment of the invention space enclosing structure cross-sectional drawing.
The specific embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-2, label 1-10 represents respectively: foundation ditch 1, shield structure segment 2, common subterranean wall 3, ultra-short underground walls 4, subterranean wall short wall 5, shaped steel cement mixing method 6, add that solid 7, steel support 8, steel bar concrete supports 9, steel bar concrete encloses purlin 10.
Shown in Fig. 1-2, foundation ditch 1 excavates along face of land road construction planning and forms, and shield structure segment 2 is passed through its below, length and width according to foundation ditch 1, be distributed with some subterranean wall in foundation ditch 1 both sides, because foundation ditch 1 other positions (as both ends) do not exert an influence to the description of the embodiment of the invention, thus omit among Fig. 1, and in only keep foundation ditch 1 both sides partly descend wall construction.The wherein parallel and symmetrical distribution of foundation ditch 1 left and right sides subterranean wall, promptly the relative subterranean wall in foundation ditch 1 left and right sides can be similar to the two sides that constitute a cuboid.For convenience of description, the subterranean wall that will have above-mentioned position relation herein is called a pair of subterranean wall.
Because the factor of tunnel crossing construction, the subterranean wall of foundation ditch 1 both sides is divided into two kinds:
Subterranean wall at the interval through section of non-shield structure is common subterranean wall 3, and subterranean wall can adopt normal foundation pit enclosure structure herein, and this is those skilled in the art's common technique, is not giving unnecessary details at this.
At the interval through section of shield structure, the subterranean wall of these place's foundation ditch 1 both sides is the ultra-short underground walls 4 of thickness 1m, ultrashort refer to insertion herein than ultrashort, purpose is to reduce the degree of depth of the following ultra-short underground walls 4 in foundation ditch 1 bottom, and tunnel machine is passed through smoothly, for reaching this purpose, the toe of wall of ultra-short underground walls 4 should be positioned at the position that top, later stage shield structure top is not less than 0.5m.Satisfying on the basis of this condition, default other operating mode is as follows in the present embodiment: ultra-short underground walls 4 is 4m in the following body of wall length in the end, hole, and this moment, foundation depth was 16m, and this moment, the insertion ratio of ultra-short underground walls 4 was 0.25.Because following curtailment at the bottom of the hole of ultra-short underground walls 4 for guaranteeing the reliability of space enclosing structure stress system, also is vertically installed with the short wall 5 of subterranean wall, with the horizontal movement of constraint subterranean wall direction in the hole in the middle of every pair of ultra-short underground walls 4.The short wall 5 of this subterranean wall is positioned at following position, foundation ditch 1 bottom, with the construction in the foundation ditch after avoiding interference 1; And its two ends should be positioned at the center of ultra-short underground walls 4 as far as possible, this moment, ultra-short underground walls 4 was identical in the both sides length of the short wall of subterranean wall 5 ends, stablizing of easier its structure of maintenance, and every pair of subterranean wall described above can be similar to the two sides that constitute a cuboid, is in order to reach this purpose equally.When the every pair of subterranean wall constitutes the two sides of a cuboid, and the short wall of subterranean wall 5 two ends are most preferred situation when laying respectively at the centerline of two ultra-short underground walls 4 length directions.In practice of construction, along with the variation of foundation ditch 1 shape, possibly can't satisfy above-mentioned requirements, then should meet above-mentioned requirement as much as possible.
In addition, be provided with also between subterranean wall that steel supports 8, steel bar concrete support 9 and steel bar concrete enclose purlin 10, this is common technique in the industry, is not giving unnecessary details at this.
The outside at the interval through section of foundation ditch 1 shield structure also is provided with some elongated Φ 1000 shaped steel cement mixing methods 6 continuously, with the monolithic stability of foundation ditch during guaranteeing to excavate and satisfy requirement such as the anti-piping of foundation ditch.For reducing the engineering construction risk, the end, foundation ditch 1 shield structure through section hole, also adopt full section rotary jet strengthening to add solid 7 with formation, to reduce cheating subsoil body protuberance displacement, guarantees the safety of surrounding enviroment, adds solid 7 bottoms and flush with the toe of wall of the short wall 5 of subterranean wall.
Foundation pit enclosure structure after construction is finished has more than been described, so that purpose of the present invention and design are described.In conjunction with above-mentioned foundation pit enclosure structure, below be described in detail for the job practices of this space enclosing structure:
A) at first delimit the width regions of ultra-short underground walls 4 yet to be built on ground, the width regions of Yi ultra-short underground walls 4 as shown in fig. 1,4 area surrounded of ultra-short underground walls are place, foundation ditch 1 place, and need deep-cut foundation ditch 1 after diaphragm wall forms.Excavate the soil body afterwards and form ultra-short underground walls groove section, top, shield structure top was not less than the 0.5m place after the bottom of groove section should be positioned at.
B) install reinforcing cage and concrete perfusion in the formed groove section of step a) afterwards, making up a pair of ultra-short underground walls 4, the toe of wall of ultra-short underground walls 4 promptly satisfied and was positioned at the requirement that top, later stage shield structure top is not less than the position of 0.5m this moment.
C) width regions of the short wall 5 of delimitation subterranean wall yet to be built between ultra-short underground walls that step b) forms 4.Excavate the soil body afterwards, to constitute the groove section perpendicular to ultra-short underground walls 4, described groove section bottom is concordant with the bottom of groove section in the step a).
D) install reinforcing cage and concrete perfusion in the formed groove of step c), to make up the short wall 5 of subterranean wall, the requirement of foundation ditch 1 bottom after the top that should guarantee the short wall 5 of subterranean wall after the moulding in this process is not higher than.
E) as above-mentioned order according to construction direction make up successively every pair of ultra-short underground walls 4 and between the short wall 5 of subterranean wall.
F) shaped steel cement mixing method 6 is set afterwards outside foundation ditch 1.
G) adopt full section rotary jet strengthening to add solid 7 with formation at the bottom of the hole of foundation ditch 1 shield structure through section afterwards, the bottom that adds solid 7 this moment flushes with the toe of wall of the short wall of described subterranean wall.
H) deep-cut foundation ditch 1, foundation ditch 1 shield structure through section need dig to the toe of wall place of the short wall 5 of subterranean wall.
I) after finishing main structure construction, pull out shaped steel in the shaped steel cement mixing method 6, for the shield structure is provided by the condition that provides.
The construction process that the inventive method is related includes but not limited to 9 above-mentioned steps.
Below reach embodiment in conjunction with the accompanying drawings the object of the invention is described in detail, but should only not only limit to operating mode described above.For the hole foundation ditch of shield structure crossing construction there is in the future the end, all can adopts technical scheme of the present invention.

Claims (5)

1. construction method of enclosure structure with ultra-short underground walls, this method are used for the base pit engineering that the shield driven tunnel crossing construction is carried out in its below, and it is characterized in that: this method has following steps:
A) carry out trenching construction according to the size of every pair of ultra-short underground walls yet to be built, the groove section bottom of being dug should be positioned at top, shield structure top and be not less than the 0.5m place;
B) install reinforcing cage and concrete perfusion in the formed groove section of step a) are to make up a pair of described ultra-short underground walls;
C) form in step b) and carry out trenching construction between the ultra-short underground walls once more, to constitute the groove section perpendicular to described ultra-short underground walls, described groove section bottom is concordant bottom ultra-short underground walls groove section;
D) install reinforcing cage and concrete perfusion in the formed groove section of step c) are to make up the short wall of horizontal subterranean wall.
2. a kind of construction method of enclosure structure with ultra-short underground walls according to claim 1 is characterized in that this method also includes the step that the shaped steel cement mixing method is set outside foundation ditch after step d), pull out shaped steel after finishing main structure construction.
3. a kind of construction method of enclosure structure with ultra-short underground walls according to claim 1 is characterized in that this method adopts full section rotary jet strengthening after step d) at the bottom of the hole of shield structure through section.
4. a kind of construction method of enclosure structure with ultra-short underground walls according to claim 3 is characterized in that the bottom that adds solid that described rotary jet strengthening produces flushes with the toe of wall of the short wall of described subterranean wall.
5. a kind of construction method of enclosure structure with ultra-short underground walls according to claim 1, the two ends that it is characterized in that digging in the step c) groove section of establishing lay respectively at the centerline of two ultra-short underground walls length directions.
CN2009103129206A 2009-12-31 2009-12-31 Construction method of enclosure structure with ultra-short underground walls Active CN101824823B (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN102493458A (en) * 2011-11-24 2012-06-13 天津二十冶建设有限公司 Construction method for closing end of deep foundation pit steel sheet pile in soft soil foundation pipe trench and power tunnel engineering
CN111910646A (en) * 2020-08-19 2020-11-10 上海隧道工程有限公司 Foundation pit composite enclosure structure with existing underground structure striding upwards and construction method thereof

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