CN110985011B - Three-step seven-step combined excavation method for upper step of soft soil layer by adopting middle partition wall - Google Patents

Three-step seven-step combined excavation method for upper step of soft soil layer by adopting middle partition wall Download PDF

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Publication number
CN110985011B
CN110985011B CN201911388159.4A CN201911388159A CN110985011B CN 110985011 B CN110985011 B CN 110985011B CN 201911388159 A CN201911388159 A CN 201911388159A CN 110985011 B CN110985011 B CN 110985011B
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China
Prior art keywords
steel arch
arch frame
anchor rod
excavation
locking anchor
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CN201911388159.4A
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Chinese (zh)
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CN110985011A (en
Inventor
孙杰
石义
甄西东
李江
李雷
金宝
吴建亮
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Design & Research Institute Of Jinan Urban Construction Group Co ltd
Jinan Municipal Engineering Construction Group Co ltd
Shandong Huitong Construction Group Co ltd
Shandong Huiyou Municipal Landscape Group Co ltd
Shandong Yifangda Construction Project Management Co ltd
Jinan Urban Construction Group Co Ltd
Shandong Quanjian Engineering Testing Co Ltd
Original Assignee
Design & Research Institute Of Jinan Urban Construction Group Co ltd
Jinan Municipal Engineering Construction Group Co ltd
Shandong Huitong Construction Group Co ltd
Shandong Huiyou Municipal Landscape Group Co ltd
Shandong Yifangda Construction Project Management Co ltd
Jinan Urban Construction Group Co Ltd
Shandong Quanjian Engineering Testing Co Ltd
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Priority to CN201911388159.4A priority Critical patent/CN110985011B/en
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    • 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
    • E21D9/04Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
    • 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
    • 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
    • E21D11/14Lining predominantly with metal
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches

Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to a three-step seven-step combined excavation method for an upper step of a soft soil layer by adopting a middle partition wall.

Description

Three-step seven-step combined excavation method for upper step of soft soil layer by adopting middle partition wall
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a three-step seven-step combined excavation method for upper steps of a soft soil layer by adopting a middle partition wall.
Background
The existing tunnel underground excavation construction method mainly comprises a full-section excavation method, a step excavation method, a circular excavation reserved core soil method, a single-side wall pit guiding method, a double-side wall pit guiding method, a middle partition wall method, a crossed middle partition wall method, a middle tunnel method, a side tunnel method, a column tunnel method, a hole pile method and the like. The tunnel excavation construction method has many factors to be considered, including factors in various aspects such as geological conditions, tunnel span, construction period, safety, economy, surrounding environment conditions and the like, and the traditional excavation method cannot meet the construction conditions which are variable on site.
Although the middle partition wall method in the existing tunnel excavation method is suitable for soft soil layers, the construction progress is slow, the number of temporary supports is large, the workload for dismantling the middle partition wall is large, and the construction is complicated and the efficiency is low; however, the three-step and seven-step excavation method is simple and quick, is suitable for the conditions of small span and better soil quality, and is easy to cause large settlement and convergence deformation and cannot guarantee construction safety because the arch legs are disturbed for many times in the construction process of the three-step and seven-step excavation method and cannot be closed into rings in time if a soft soil layer is encountered.
In addition, in the tunnel underground excavation construction technology, the control of the clearance deformation of the steel arch frame depends on whether the 'locking foot' is effective or not to a great extent, if the connection of the locking foot anchor rod and the steel arch frame is in failure, the locking foot anchor rod is separated from the steel arch frame, the force transmission of a stress system is interrupted, and the steel arch frame is deformed or even collapsed in serious cases. Because the construction mandatory requirements of the foot-locking anchor rod in the technical Specification for road tunnel construction (LTGF 60-2009) do not exist, the connection quality of the foot-locking anchor rod and the steel arch frame of the underground excavation tunnel cannot be effectively controlled. Conventional foot-locking anchor rod connection techniques tend to suffer from two problems: the field welding workload is large, and the welding quality is poor; the force transmission components of the foot locking anchor rods and the steel arch centering are complex, and the engineering construction progress is influenced.
Disclosure of Invention
The invention provides a three-step seven-step combined excavation method for upper steps of a soft soil layer by adopting a middle partition wall, aiming at solving the defects of the prior art.
The invention is realized by the following technical scheme:
a three-step seven-step combined excavation method for upper steps of soft soil layers by adopting a middle partition wall comprises the following steps:
excavating an upper step on the left side, timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame, constructing a middle partition wall of the upper step, constructing a foot locking anchor rod on the steel arch frame, and spraying concrete again;
secondly, excavating a middle step on the left side, reserving core soil, performing spraying, anchoring and net system supporting in time after excavating, constructing a steel arch frame, arranging a foot locking anchor rod on the steel arch frame, and spraying concrete again;
thirdly, excavating the upper bench on the right side, and performing spraying, anchoring and net system supporting in time after excavating to construct a steel arch frame, arranging a foot locking anchor rod on the steel arch frame, and spraying concrete again;
fourthly, excavating the middle step on the right side, reserving core soil, timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame, arranging a foot locking anchor rod on the steel arch frame, and spraying concrete again;
fifthly, excavating the lower step on the left side, reserving core soil, timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame, arranging a foot locking anchor rod on the steel arch frame, and spraying concrete again;
sixthly, excavating a lower step on the right side, reserving core soil, performing spraying, anchoring and net system supporting in time after excavating, constructing a steel arch frame, arranging a foot locking anchor rod on the steel arch frame, and spraying concrete again;
and (seventhly), dismantling the middle partition wall of the upper step, excavating the middle step and reserving core soil for the lower step, closing the primary support steel arch frame into a ring, and performing inverted arch construction in time.
In the steps (a) to (b), the step of installing the locking anchor rod on the steel arch center comprises the following steps:
step S1: processing holes at positions of a steel arch frame where a foot-locking anchor rod needs to be arranged in advance, wherein the holes are formed in the edge positions, close to a web plate, of I-shaped steel flanges of the steel arch frame, the holes are formed in the upper and lower positions of flanges on the two sides of the I-shaped steel of the steel arch frame, steel sleeves are inserted between the holes in the upper and lower sides of the flanges on the same side, and the steel sleeves are welded with the I-shaped steel web plate of the steel arch frame;
step S2: after the steel arch frame vertical frame is finished, a foot locking anchor rod is formed into a hole and penetrates through a steel sleeve to be placed;
step S3: grouting to plug the gap between the end foot locking anchor rod and the steel sleeve;
step S4: and (4) performing pressure grouting on the foot-locking anchor rod, and tightly plugging the end of the foot-locking anchor rod immediately after grouting.
As a preferable scheme:
in the step (I), the middle partition wall of the upper step is a steel arch center middle partition wall.
In the step (II) and the step (IV), the length of the reserved core soil of the middle step is 3-5 m, and the width of the reserved core soil is 1/3-1/2 of the width of the tunnel excavation.
In the step (II) and the step (IV), the excavation height of the middle step is 3-3.5 m.
In the step S4, the end of the foot-locking anchor rod is tightly sealed by using an anchoring agent.
The construction method is invented for solving the construction of the tunnel with the large section of the soft soil layer. The invention relates to a three-step seven-step combined excavation method for upper steps of a soft soil layer by adopting a middle partition wall, which is a method for constructing the upper steps of the soft soil layer in a staggered and parallel manner along the longitudinal direction of a tunnel by adopting an arc guide pit excavation reserved core soil as a basic mode, excavating by dividing the upper steps, the middle steps and the lower steps, adopting a steel arch frame middle partition wall for reducing deformation innovativeness of the upper steps, reserving the core soil for each stage of excavation of the middle steps and the lower steps, and advancing the excavation and the support of each part in parallel. In addition, the invention also innovatively provides a construction technology of the prefabricated steel arch guide steel sleeve tunnel foot locking anchor rod in the construction method, and compared with the traditional connection mode, the foot locking anchor rod is firmly connected with the steel arch, the force transmission is direct, the field welding workload is reduced, and the construction quality is ensured.
The upper step of the invention adopts the middle bulkhead support and the application of the construction technology of the prefabricated steel arch frame guide steel sleeve tunnel locking anchor rod, thereby accelerating the construction progress, reducing the settlement deformation of the tunnel and lowering the engineering construction cost.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of the construction steps of the present invention.
Fig. 3 is a schematic view of the connection structure of the steel arch and the foot-locking anchor rod of the invention.
In the figure, 1 upper step, 2 middle step, 3 lower step, 4 reserved core soil, 5 upper step middle partition wall, 6 locking anchor rods, 7 steel arch frame, 8 steel sleeve, 9 flange and 10 web plates.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The invention discloses a three-step seven-step combined excavation method for an upper step of a soft soil layer by adopting a middle partition wall, which combines the construction characteristics of the existing middle partition wall method and the three-step seven-step excavation method and is different from the existing middle partition wall method and the three-step seven-step excavation method, wherein an upper step middle partition wall 5 is adopted at the upper step 1 with larger arch crown deformation in an innovative way, and a middle and lower step adopts an excavation mode of reserving core soil 4. The construction method of the present invention is described in detail below:
the construction steps are as follows:
the method comprises the following steps: the left upper step 1 is excavated and is constructed as the middle partition wall 5 of the upper step
The arch part advance support is firstly carried out, the arc-shaped guide pit of the upper step 1 on the left side is excavated, the spraying, anchoring and net system support is timely carried out after the excavation, a steel arch frame 7 and an upper step middle partition wall 5 are constructed, the upper step middle partition wall 5 is the steel arch frame middle partition wall, a locking anchor rod 6 is arranged on the steel arch frame 7, and concrete is sprayed again.
Step two: left middle step 2 excavation
The left middle step 2 is excavated, the excavation height of the middle step 2 is 3-3.5 m, the core soil 4 is reserved on the middle step 2, the length of the reserved core soil 4 is 3-5 m, and the width of the reserved core soil is 1/3-1/2 corresponding to the width of the tunnel. And (3) after excavation, timely carrying out spraying, anchoring and net system supporting, constructing a steel arch centering 7, driving a foot locking anchor rod 6 on the steel arch centering 7, and spraying concrete again.
Step three: right upper bench 1 excavation
Excavating an arc guide pit of the upper step 1 on the right side, timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch 7, arranging a locking anchor rod 6 on the steel arch 7, and spraying concrete again.
Step four: right middle step 2 excavation
And excavating a right middle step 2, ensuring the step pitch of the left side and the right side to be 5m, and ensuring the excavating height of the middle step 2 to be 3-3.5 m. The middle step 2 is reserved with core soil 4, the length of the reserved core soil 4 is 3-5 m, and the width of the reserved core soil is 1/3-1/2 which is suitable for tunnel excavation. And (3) after excavation, timely carrying out spraying, anchoring and net system supporting, constructing a steel arch centering 7, driving a foot locking anchor rod 6 on the steel arch centering 7, and spraying concrete again.
Step five: left lower bench 3 excavation
Excavating a left lower step 3, reserving core soil 4 in the lower step 3, and excavating the lower step 3 to an excavating height of 3-3.5 m. And (3) after excavation, timely carrying out spraying, anchoring and net system supporting, constructing a steel arch centering 7, driving a foot locking anchor rod 6 on the steel arch centering 7, and spraying concrete again.
Step six: right lower bench 3 excavation
Excavating a right lower step 3, reserving core soil 4 in the lower step 3, excavating the lower step 3 to an excavating height of 3-3.5 m, ensuring a step pitch of the left side and the right side to be 5m, timely performing spraying, anchoring and net system supporting after excavating, constructing a steel arch centering 7, arranging a locking anchor rod 6 in the steel arch centering 7, and spraying concrete again.
Step seven: removing the middle partition wall 5 of the upper step, and excavating the core soil of the middle and lower steps
After the excavation reaches a certain advancing ruler, sequentially removing the middle partition wall 5 of the upper step, respectively reserving core soil 4 in the middle step 2 and the lower step 3, and keeping the removing and excavating advancing ruler consistent with the circulating advancing ruler of each step; and (5) closing the primary support steel arch frame into a ring, and performing inverted arch construction in time.
In the construction steps, all the steel arch centering 7 are arranged with the locking anchor rod 6 by adopting a technology different from the prior arranging method, and the invention is named as: the utility model provides a prefabricated steel bow member direction steel sleeve tunnel lock foot stock construction technology, the detailed step of construction is:
step S1: when the steel arch centering 7 is processed, a hole for placing the foot-locking anchor rod 6 is processed at the position where the foot-locking anchor rod 6 needs to be arranged in advance, and the diameter of the hole is larger than that of the foot-locking anchor rod 6. The hole is arranged at the edge position of an I-shaped steel flange 9 of the steel arch center 7 close to a web 10, namely the hole is drilled on the I-shaped steel flange 9 of the steel arch center 7 and is closely attached to the I-shaped steel web 10 of the steel arch center 7, holes are drilled at the upper and lower positions of flanges 9 at the two sides of the I-shaped steel of the steel arch center 7, a steel sleeve 8 is inserted between the holes at the upper and lower positions of the flange 9 at the same side of the steel arch center 7, and the steel sleeve 8 is welded with the I-shaped steel web 10 of the steel arch center 7.
Step S2: after the steel arch frame 7 is erected, the foot locking anchor rod 6 is formed into a hole and penetrates through the steel sleeve 8 to place the foot locking anchor rod 6.
Step S3: and (3) plugging a gap between the end part foot locking anchor rod 6 and the steel sleeve 8, and grouting and filling are dense.
Step S4: and (4) performing pressure grouting on the foot-locking anchor rod 6, and immediately plugging the end of the foot-locking anchor rod 6 tightly by using an anchoring agent after grouting.
The upper step 1 of the invention adopts the construction technology of the middle bulkhead support and the prefabricated steel arch frame guide steel sleeve tunnel locking anchor rod to accelerate the construction progress, greatly reduces the settlement deformation of the tunnel and lowers the engineering construction cost.
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a seven step combination excavation methods of three steps that soft soil layer upper step adopted well next door which characterized in that: the method comprises the following steps:
firstly, excavating an upper step (1) on the left side, timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame (7), constructing a middle partition wall (5) of the upper step, arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
secondly, excavating the middle step (2) on the left side, reserving core soil (4), timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame (7), arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
thirdly, excavating the upper step (1) on the right side, performing spraying, anchoring and net system supporting in time after excavating, constructing a steel arch frame (7), arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
fourthly, excavating the right middle step (2), reserving core soil (4), timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame (7), arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
fifthly, excavating the lower step (3) on the left side, reserving core soil (4), timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame (7), arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
sixthly, excavating the lower step (3) on the right side, reserving core soil (4), timely performing spraying, anchoring and net system supporting after excavation, constructing a steel arch frame (7), arranging a foot locking anchor rod (6) on the steel arch frame (7), and spraying concrete again;
seventhly, dismantling an upper step middle partition wall (5), excavating a middle step (2) and a lower step (3) to reserve core soil (4), closing a primary support steel arch frame into a ring, and performing inverted arch construction in time;
in the steps (a) to (b), the step of installing the foot-locking anchor rod (6) on the steel arch frame (7) comprises the following steps:
step S1: processing a hole at the position of a steel arch frame (7) where a foot-locking anchor rod (6) needs to be drilled in advance, wherein the hole is formed at the edge position of an I-shaped steel flange (9) of the steel arch frame (7) close to a web (10), the upper flange and the lower flange (9) at the two sides of the I-shaped steel web (10) of the steel arch frame (7) are both drilled with holes, a steel sleeve (8) is inserted between the upper hole and the lower hole of the flange (9) at the same side of the web (10), and the steel sleeve (8) is welded with the I-shaped steel web (10) of the steel arch frame (7);
step S2: after the steel arch frame (7) is erected, the foot locking anchor rod (6) is formed into a hole and penetrates through the steel sleeve (8) to place the foot locking anchor rod (6);
step S3: grouting to plug a gap between the end foot locking anchor rod (6) and the steel sleeve (8);
step S4: and (3) performing pressure grouting on the foot locking anchor rod (6), and immediately plugging the end of the foot locking anchor rod (6) tightly after grouting.
2. The three-step seven-step combined excavation method for the upper step of the soft soil layer by adopting the middle partition wall according to claim 1, is characterized in that: in the step (I), the upper step middle partition (5) is a steel arch center middle partition.
3. The three-step seven-step combined excavation method for the upper step of the soft soil layer by adopting the middle partition wall according to claim 1, is characterized in that: in the step (two) and the step (four), the length of the reserved core soil (4) of the middle step (2) is 3-5 m, and the width of the reserved core soil is 1/3-1/2 of the width of the tunnel excavation.
4. The three-step seven-step combined excavation method for the upper step of the soft soil layer by adopting the middle partition wall according to claim 1, is characterized in that: in the step (II) and the step (IV), the excavation height of the middle step (2) is 3-3.5 m.
5. The three-step seven-step combined excavation method for the upper step of the soft soil layer by adopting the middle partition wall according to claim 1, is characterized in that: in the step S4, the end of the foot-locking anchor rod (6) is tightly sealed by using an anchoring agent.
CN201911388159.4A 2019-12-30 2019-12-30 Three-step seven-step combined excavation method for upper step of soft soil layer by adopting middle partition wall Active CN110985011B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08170485A (en) * 1994-12-16 1996-07-02 Shimizu Corp Blasting construction method
CN203499701U (en) * 2013-10-08 2014-03-26 四川公路桥梁建设集团有限公司 Guide positioning connecting structure for feet-lock bolt of steel frame of tunnel
CN104612698A (en) * 2015-01-24 2015-05-13 杭州天恒投资建设管理有限公司 Method for constructing upper step middle partition wall of shallow-buried excavation tunnel
CN107060771A (en) * 2016-12-28 2017-08-18 广东省长大公路工程有限公司 Middle short tunnel is unidirectionally appeared excavation method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08170485A (en) * 1994-12-16 1996-07-02 Shimizu Corp Blasting construction method
CN203499701U (en) * 2013-10-08 2014-03-26 四川公路桥梁建设集团有限公司 Guide positioning connecting structure for feet-lock bolt of steel frame of tunnel
CN104612698A (en) * 2015-01-24 2015-05-13 杭州天恒投资建设管理有限公司 Method for constructing upper step middle partition wall of shallow-buried excavation tunnel
CN107060771A (en) * 2016-12-28 2017-08-18 广东省长大公路工程有限公司 Middle short tunnel is unidirectionally appeared excavation method

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