CN111894033A - Pipe gallery construction method for solidifying and excavating firstly - Google Patents

Pipe gallery construction method for solidifying and excavating firstly Download PDF

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Publication number
CN111894033A
CN111894033A CN202010675635.7A CN202010675635A CN111894033A CN 111894033 A CN111894033 A CN 111894033A CN 202010675635 A CN202010675635 A CN 202010675635A CN 111894033 A CN111894033 A CN 111894033A
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China
Prior art keywords
pipe gallery
soil
curing
excavated
construction
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CN202010675635.7A
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Chinese (zh)
Inventor
陈龙
李德晟
陈永辉
孔纲强
沈政
林民国
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Hohai University HHU
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Hohai University HHU
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Priority to CN202010675635.7A priority Critical patent/CN111894033A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention discloses a construction method of a pipe gallery which is solidified and excavated, in particular to a construction method of a pipe gallery which does not need supporting excavation in a soft soil area, and the construction method mainly comprises the following steps: curing agent ratio design, field treatment, in-situ curing treatment, pipe gallery excavation, pipe gallery construction and solidified soil backfilling. The method is used for solidifying the soft soil body in the pipe gallery excavation range to form solidified soil with certain self-supporting capacity, the pipe gallery is excavated in the solidified soil, the soil bodies on two sides can resist soil pressure generated by excavation, and engineering safety can be guaranteed. The excavated soil body can be used as backfill on the upper part of the pipe gallery after resource utilization, and can also provide high-quality fillers for other road projects. The method can avoid driving of the support piles, resource utilization of the waste soil body is achieved, economic benefits are higher, and environmental protection is facilitated.

Description

Pipe gallery construction method for solidifying and excavating firstly
Technical Field
The invention belongs to the technical field of urban underground pipeline arrangement and maintenance, and particularly relates to a construction method of a pipe gallery which is solidified and then excavated.
Background
The pipe gallery is used for placing pipelines, and the comprehensive pipe gallery integrates various pipelines such as electric power, telecommunication, fuel gas, water supply, heating power and the like, has the characteristics of comprehensiveness, long-acting property, maintainability, earthquake and disaster resistance, environmental protection, low cost, investment diversity, operational reliability and the like, and is an important urban municipal foundation project. Nowadays, with the acceleration of urbanization process and the increase of various pipeline demands, the distribution range of pipe galleries in cities is gradually enlarged, and sometimes the pipe galleries inevitably need to be excavated on soft soil foundations.
Due to the limitation of a construction site, the urban pipe gallery is excavated by adopting a supporting excavation form. In the traditional pipe gallery construction, cast-in-place piles and steel sheet piles are required to be arranged on two sides of a construction area for peripheral supporting, and then excavation is carried out, so that the problems of approach of large-scale construction equipment, city height limit, supporting cost and the like are considered. The excavation of pipe gallery in soft soil area then produces a large amount of waste soil, and these waste soil often are difficult to handle because of its characteristics such as high water content, high viscosity, poor drainage, intensity are low, the pore ratio is big, and the soft soil needs special attention transport vehicle's sealed problem in the transportation, can cause the occupation and the environmental destruction of soil again when piling up. On the other hand, the backfill after the pipe gallery is built needs high-quality filling materials, and the production of the conventional filling materials such as slag needs additional mountain quarrying. The resource utilization of waste soil is proposed in the current environmental protection strategy, and how to reasonably utilize the soil is a main hot spot.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pipe gallery construction method which is simple in construction method, utilizes waste soil as resources, protects the environment and has higher economic benefit.
In order to solve the technical problems, the invention adopts the following technical scheme: a construction method of a pipe gallery which is solidified and then excavated comprises the following steps:
step 1, designing and calculating: the method comprises the steps of determining the proportion of a curing agent and designing a curing area;
step 1a, determining the proportion of a curing agent: determining the proportion of the curing agent through an indoor test;
step 1b, designing a curing area: designing and calculating an in-situ curing construction area;
step 2, site treatment: the method comprises the steps of cleaning a field and assembling equipment to enter the field;
step 2a, site preparation: mainly comprises the steps of draining water on the ground surface of a site in an in-situ curing construction area and cleaning sundries such as stones on the surface layer;
step 2b, assembling equipment to enter a field: assembling the power supply system, the feeding system and the stirring equipment, and then entering the site of the in-situ curing construction area in the step 2 a;
step 3, in-situ curing treatment: carrying out in-situ curing treatment on the soft soil in the in-situ curing construction area field in the step 2b, wherein the in-situ curing treatment is realized by stirring and mixing the soft soil and a curing agent by using in-situ curing equipment;
step 4, excavating the pipe gallery: after the strength of the solidified soil solidified in the step 3 meets the requirement, excavating a pipe gallery by using a common excavator in an entrance way, and reserving the excavated solidified soil;
step 5, pipe gallery construction: performing entrance construction on the pipe gallery excavated in the step 4;
step 6, solidified soil backfilling: and (4) backfilling the solidified soil reserved in the step (4) after the construction of the pipe gallery is completed.
Further, the in-situ curing construction area in the step 1b is trapezoidal or stepped. According to different curing agent proportions and field conditions, a curing area needs to be specifically designed and can be in a trapezoid shape or a step shape, and design parameters comprise B1 and B H, H1 in the attached drawing 1, a toe alpha and the like.
Further, B1Greater than 50 cm, 150 cm H1More than 50 cm, the functions of water supply or power supply and the like of the pipe gallery are met.
The method is further characterized in that the curing agent in the step 3 comprises powder or slurry, the water content of the soft soil in the step 3 is 30-100% by mass, and the mass mixing amount of the curing agent is 6-20% of the mass of the original soil.
Further, the curing agent is a conventional curing agent and is commercially available.
Further, the step 3 in-situ curing treatment can be directly carried out on the cleaned site in situ.
Further, the curing mode in the step 3 is to vertically and mechanically stir and cure the sludge by adopting in-situ curing equipment or to re-cure the sludge by adopting layered stirring, and the curing treatment depth at least reaches a high-quality soil layer.
Furthermore, the solidified soil excavated from the side surface of the pipe gallery after excavation in the step 4 can be used as a permanent stress structure, so that redundant support is avoided, and the pipe gallery can be directly excavated by using a common excavator.
Further, the in-situ curing and stirring device can comprise a stirring arm, a mixing roller, a blade mechanism, a curing agent conveying pipe, a spraying device and the like. Two sides of the bottom of the stirring arm are provided with two inclined planes which are inclined inwards, each inclined plane is provided with at least one mixing roller, the mixing rollers are driven by driving equipment to rotate, and the mixing rollers are in a truncated cone shape; blade mechanisms are distributed on the mixing rolling shaft; and a telescopic curing agent conveying pipe is arranged in the stirring arm. And the tail end of the curing agent conveying pipe is provided with a spraying device.
The invention has the following positive effects:
(1) according to the invention, before the pipe gallery is excavated, the soft soil and the curing agent are stirred, mixed and cured by using stirring equipment, so that the curing speed is high and the efficiency is high.
(2) The invention avoids the driving of the support pile in the pipe gallery excavation construction, and has simple operation and high economic benefit.
(3) The invention realizes the reutilization of the waste soil after excavation, saves resources and is beneficial to environmental protection.
Drawings
FIG. 1 is a construction flow chart of a pipe gallery which is firstly cured and then excavated;
FIG. 2 is a schematic view of the construction of a pipe gallery which is cured and then excavated;
FIG. 3 is a cross-sectional view of a solidification region;
FIG. 4 is a schematic view of an in situ curing apparatus.
Wherein, B1Is the width of the top surface, H is the height from the bottom to the top surface, H1The height from the bottom to the bottom end of the pipe gallery area, and alpha is a toe.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1
Referring to fig. 1, the construction method of the pipe gallery of the invention, which is cured and excavated, comprises the following steps: the method comprises the following steps of determining the proportion of a curing agent, designing and calculating a curing area, cleaning a field, entering an assembly device, carrying out in-situ curing treatment, excavating a pipe gallery, constructing the pipe gallery and backfilling cured soil. The specific development is as follows:
step 1, designing and calculating: the method comprises the steps of determining the proportion of a curing agent and designing a curing area.
Step 1a, determining the proportion of a curing agent: the proportion of the curing agent is determined by indoor tests.
Step 1b, designing a curing area: and carrying out design calculation on the in-situ curing construction area.
Specifically, the soil is taken out on site and returned to a laboratory for strength test, and curing agents with different mixing amounts are added according to the properties of the soil body. Generally, a soil sample is made into a cylindrical sample with the diameter of 39.1mm and the height of 80mm, and an unconfined compressive strength test is carried out to check whether the design or use requirements are met. The unconfined compressive strength test can convert the bearing capacity of a soil body and is one of main test modes of the mix proportion of the solidified soil.
Wherein, this application the solidification zone need design according to different curing agent mix proportions, the solidification zone can be trapezoidal, also can be the notch cuttype, design parameter includes B1、H、H1And toe α, and the like. Certain thickness is left at the lower part of the pipe gallery to ensure that the bearing capacity of the foundation can meet the requirements。
Each parameter index meets the following conditions: b is1Greater than 50 cm, 150 cm H1More than 50 cm, the functions of water supply or power supply and the like of the pipe gallery are met.
Step 2, site treatment: the method comprises the steps of cleaning a field and assembling equipment to enter the field.
Step 2a, site preparation: mainly comprises the steps of draining water on the ground surface of a site in an in-situ curing construction area and cleaning sundries such as stones on the surface layer;
step 2b, assembling equipment to enter a field: and (3) assembling the power supply system, the feeding system and the stirring equipment, and then entering the site of the in-situ curing construction area in the step (2 a).
And 3, curing in situ. And carrying out in-situ solidification according to the soil solidification area determined in the previous step. In-situ solidification can adopt a strong stirring in-situ solidification or conventional soil body mixing construction mode, and a curing agent and a soil body are uniformly mixed through a stirring device so as to achieve the purpose of soil body reinforcement.
Specifically, when the in-situ curing equipment is used for curing the soft soil, the selected curing agent is powder or slurry and is selected according to the water content of the soft soil and the environmental requirement. And stirring the curing agent and the soft soil to quickly cure the curing agent.
This example uses a conventional concrete sealing curing agent, which is commercially available.
Referring to fig. 4, the in-situ curing apparatus described herein includes a power supply system, a material supply system, and a stirring apparatus, and may select an external power source or generate power by itself according to the field situation.
Specifically, the in-situ curing and stirring equipment comprises a stirring arm, a mixing roller, a blade mechanism, a curing agent conveying pipe, a spraying device and the like. Two sides of the bottom of the stirring arm are provided with two inclined planes which are inclined inwards, each inclined plane is provided with at least one mixing roller, the mixing rollers are driven by driving equipment to rotate, and the mixing rollers are in a truncated cone shape; blade mechanisms are distributed on the mixing rolling shaft; and a telescopic curing agent conveying pipe is arranged in the stirring arm. And the tail end of the curing agent conveying pipe is provided with a spraying device.
Specifically, the solidification mode is to adopt in-situ solidification equipment to vertically and mechanically stir and solidify the sludge vertically or adopt layered stirring and re-solidification, and the solidification treatment depth at least reaches a high-quality soil layer.
And 4, excavating the pipe gallery. After the strength of the soil body solidification area meets the corresponding bearing capacity requirement, a common excavator can be used for entering the field, and the pipe gallery area is excavated. The soil body around the pipe gallery has certain strength, so that the soil pressure generated by excavating the pipe gallery can be resisted, and the stability of the soil body in the solidification area is kept. This mode can reduce the setting of inside support, provides sufficient space for the piping lane construction.
And 5, constructing the pipe gallery. The pipe can carry out the construction of piping lane after the corridor region is dug out, carries out the concatenation of piping lane pouring or piping lane, forms the piping lane.
And 6, backfilling the solidified soil. After the piping lane construction was accomplished, the soil material that the piping lane side and the backfill material at piping lane top can use the excavation to come out was filled out, also can transport the recycle to the solidification soil, realizes the utilization of the resource of abandonment soil.

Claims (5)

1. A construction method of a pipe gallery which is solidified and then excavated is characterized by comprising the following steps:
step 1, designing and calculating: the method comprises the steps of determining the proportion of a curing agent and designing a curing area;
step 1a, determining the proportion of a curing agent: determining the proportion of the curing agent through an indoor test;
step 1b, designing a curing area: designing and calculating an in-situ curing construction area;
step 2, site treatment: the method comprises the steps of cleaning a field and assembling equipment to enter the field;
step 2a, site preparation: mainly comprises the steps of draining water on the ground surface of a site in an in-situ curing construction area and cleaning sundries such as stones on the surface layer;
step 2b, assembling equipment to enter a field: assembling the power supply system, the feeding system and the stirring equipment, and then entering the site of the in-situ curing construction area in the step 2 a;
step 3, in-situ curing treatment: carrying out in-situ curing treatment on the soft soil in the in-situ curing construction area field in the step 2b, wherein the in-situ curing treatment is realized by stirring and mixing the soft soil and a curing agent by using in-situ curing equipment;
step 4, excavating the pipe gallery: after the strength of the solidified soil solidified in the step 3 meets the requirement, excavating a pipe gallery by using a common excavator in an entrance way, and reserving the excavated solidified soil;
step 5, pipe gallery construction: performing entrance construction on the pipe gallery excavated in the step 4;
step 6, solidified soil backfilling: and (4) backfilling the solidified soil reserved in the step (4) after the construction of the pipe gallery is completed.
2. The method of claim 1, wherein the step 1b in-situ cured construction area is trapezoidal or stepped.
3. The construction method of the pipe gallery which is cured and excavated according to claim 1, wherein the curing agent in the step 3 comprises powder or slurry, the water content of the soft soil in the step 3 is 30-100% by mass, the mass mixing amount of the curing agent is 6-20% of the mass of the original soil, and the curing agent is commercially available.
4. The method of claim 1, wherein the step 3 in-situ curing process is performed on-site directly on the cleaned site.
5. The method for constructing the pipe gallery after being cured and excavated according to claim 1, wherein the cured soil excavated from the side surface of the pipe gallery after being excavated in the step 4 can be placed at the position of an original support pile to be used as a permanent stress structure, so that the condition that redundant support can be directly excavated by using a common excavator is avoided.
CN202010675635.7A 2020-07-14 2020-07-14 Pipe gallery construction method for solidifying and excavating firstly Pending CN111894033A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1517495A (en) * 2003-01-24 2004-08-04 诺比利费拉里有限责任公司 Continuous redlizing method of underground engieering, tunnel and underground tunnel, reinforced engineering, sealing engineering and drainage work obtained by guide punching
JP2006138091A (en) * 2004-11-11 2006-06-01 Elf:Kk Construction method for burying tank and the like
CN105178355A (en) * 2015-10-20 2015-12-23 重庆交通大学 Stratum pre-reinforcement treatment method for underground space construction
CN104863113B (en) * 2015-06-04 2017-08-22 杭州特诚基础工程科技有限公司 The method and mixing plant of original place curing process are carried out to in-situ soil
CN110847929A (en) * 2019-11-20 2020-02-28 中铁二十局集团有限公司 Tunnel portal section pre-reinforcing and excavating construction method based on partition blasting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1517495A (en) * 2003-01-24 2004-08-04 诺比利费拉里有限责任公司 Continuous redlizing method of underground engieering, tunnel and underground tunnel, reinforced engineering, sealing engineering and drainage work obtained by guide punching
JP2006138091A (en) * 2004-11-11 2006-06-01 Elf:Kk Construction method for burying tank and the like
CN104863113B (en) * 2015-06-04 2017-08-22 杭州特诚基础工程科技有限公司 The method and mixing plant of original place curing process are carried out to in-situ soil
CN105178355A (en) * 2015-10-20 2015-12-23 重庆交通大学 Stratum pre-reinforcement treatment method for underground space construction
CN110847929A (en) * 2019-11-20 2020-02-28 中铁二十局集团有限公司 Tunnel portal section pre-reinforcing and excavating construction method based on partition blasting

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