CN115324588A - Municipal underground engineering construction method - Google Patents
Municipal underground engineering construction method Download PDFInfo
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- CN115324588A CN115324588A CN202211022618.9A CN202211022618A CN115324588A CN 115324588 A CN115324588 A CN 115324588A CN 202211022618 A CN202211022618 A CN 202211022618A CN 115324588 A CN115324588 A CN 115324588A
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- pressure
- freezing
- excavation section
- underground engineering
- engineering construction
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- 238000010276 construction Methods 0.000 title claims abstract description 35
- 230000008014 freezing Effects 0.000 claims abstract description 47
- 238000007710 freezing Methods 0.000 claims abstract description 47
- 238000009412 basement excavation Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 239000012267 brine Substances 0.000 claims description 23
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000002528 anti-freeze Effects 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010257 thawing Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a municipal underground engineering construction method, which comprises the following steps: s1, constructing a working well beside a surface building in advance, wherein the depth of the working well is equal to or deeper than the bottom surface of an excavation section; s2, reinforcing the stratum of the excavation section by a freezing method to form a temporary reinforcing body, so that a frozen wall is formed outside the excavation section; s3, arranging a pressure balancer between the ground building and the freezing wall positioned at the upper part, wherein a compressible flexible pipe is arranged outside the pressure balancer; s4, adjusting the pressure in the pressure balancer in time through a pressure pump according to the pressure change of the liquid in the compressible flexible pipe to offset the additional force given to the ground by frost heaving and thawing deformation; the phenomenon of frost heaving and thaw collapse caused by the construction of the traditional freezing method can not be generated in the actual use and operation process, the construction efficiency is ensured, and the potential safety hazard possibly brought by the traditional construction mode is eliminated; the operation process is simple and convenient, the applicability is strong, and the method can be applied to construction operation in various actual environments.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a municipal underground engineering construction method.
Background
The open trench excavation of the municipal underground engineering needs ground removal, and when building facilities which cannot be removed or have high removal cost exist, a subsurface excavation method is adopted for construction;
the construction of the traditional subsurface excavation method can cause the inflow of underground water or the settlement of the ground, the subsurface excavation is carried out after the consolidation of the traditional freezing method, natural soft soil or a sand layer can be changed into frozen soil, a temporary strengthening body with good integrity, high strength and no water penetration is formed, underground engineering such as a working well or a tunnel is excavated under the protection of the freezing body, after the lining support is finished, the frozen ground layer is gradually unfrozen, and finally the original state is recovered; but the phenomena of frost heaving and thaw collapse can exist in the freezing and thawing processes of the stratum, and the protection requirements of ground buildings can not be met.
Therefore, a municipal underground engineering construction method is provided.
Disclosure of Invention
In view of the above, embodiments of the present invention are intended to provide a method for constructing municipal underground works, so as to solve or alleviate the technical problems in the prior art, and to provide at least one useful choice;
the technical scheme of the embodiment of the invention is realized as follows: a municipal underground engineering construction method comprises the following steps:
s1, constructing a working well beside a surface building in advance, wherein the depth of the working well is equal to or deeper than the bottom surface of an excavation section;
s2, reinforcing the stratum of the excavation section by a freezing method to form a temporary reinforcing body, so that a frozen wall is formed outside the excavation section, and then constructing the excavation section;
s3, arranging a pressure balancer between the ground building and the freezing wall positioned at the upper part, wherein a compressible flexible pipe is arranged outside the pressure balancer;
s4, adjusting the pressure in the pressure balancer in time through a pressure pump according to the pressure change of the liquid in the compressible flexible pipe to offset the additional force given to the ground by frost heaving and thawing deformation;
and S5, completing construction of the underground structure, and filling micro-expansion cement mortar into the pressure balancer after the frozen soil is gradually thawed to realize thorough solidification and reinforcement of the excavation section.
As a further preferred aspect of the present invention: in S2, the freezing method is to drill holes in the excavation face of the excavation section, lay steel pipes, install a liquid supply pipe and a liquid return pipe, and introduce low-temperature saline water to ensure the stratum freezing effect.
As a further preferred aspect of the present invention: the system also comprises a gate valve, the flow is adjusted through the gate valve, the temperature of circulating brine is reduced after the circulating brine flows into the refrigeration equipment, and then the circulating brine flows into the freezing steel pipe, and the circulating brine is circulated repeatedly to ensure the stratum freezing effect.
As further preferable in the present technical solution: in S3, the number of the pressure balancers is not less than two, the specific number is determined by calculation according to the adjustable deformation of the balancers, and the pressure balancers are symmetrically arranged on the upper freezing wall.
As a further preferred aspect of the present invention: in S3, a steel pipe is adopted at the connection section of the pressure balancer and the working well; the liquid in the compressible flexible pipe is antifreeze salt water; the pressure balancer monitors the pressure, and the pressure is controlled by the linkage pressure pump.
As further preferable in the present technical solution: in S2 and S3, in the process of freezing, synchronous operation is carried out with the freezing method through S4, the pressure in the compressible flexible pipe is adjusted according to the freezing process, and the influence of frost heaving and thaw collapse deformation on the ground is counteracted by using the deformation of the compressible flexible pipe.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a construction mode suitable for municipal underground engineering, which can not generate frost heaving and thaw collapse phenomena generated by the construction of the traditional freezing method in the actual use and operation processes, thereby eliminating potential safety hazards possibly brought by the traditional construction mode while ensuring the construction efficiency; the operation process is simple and convenient, the applicability is strong, and the method can be applied to construction operation in various actual environments.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the construction process of the present invention;
FIG. 2 is a schematic view of the construction structure of the present invention;
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
It should be noted that the terms "first", "second", "symmetrical", "array", and the like are used for descriptive and positional purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "symmetrical", etc. may explicitly or implicitly include one or more of that feature; similarly, where the number of features is not limited by the language "two", "three", etc., it is to be noted that such features can also include one or more of the number of features explicitly or implicitly;
in the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly; for example, the connection can be fixed, detachable or integrated; the connection may be mechanical, direct, welded, indirect via an intermediate medium, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art from the specification and drawings in combination with the specific situation.
Example one
Referring to fig. 1-2, the present invention provides a technical solution: a municipal underground engineering construction method;
the method comprises the following steps:
s1, firstly, constructing a working well beside a surface building in advance, wherein the depth of the working well is deeper than the bottom surface of an excavation section;
a low-temperature brine distributor, a low-temperature brine tank, refrigeration equipment and a pressure pump set are respectively installed at the representative positions of the working well;
the low-temperature brine distributor is communicated with the low-temperature brine tank and is driven by the pressure pump set; the method comprises the following steps of paving frozen steel pipes inside an external soil layer at the position of a preset excavation section, specifically, the upper part, the lower part, the left side and the right side of the preset excavation section and possible end parts according to actual construction conditions;
s2, reinforcing the stratum of the excavation section by a freezing method to form a temporary reinforcing body, so that a freezing wall (freezing curtain) is formed outside the excavation section, and then constructing the excavation section;
specifically, the formation of a temporary reinforcing body is realized by matching refrigeration equipment with a freezing steel pipe; wherein, drilling a hole in the excavation surface of the excavation section, and arranging a freezing steel pipe, a liquid supply pipe and a liquid return pipe; the freezing effect of the stratum is ensured by introducing low-temperature brine;
in the actual use process, the flow is regulated through a gate valve, the temperature of circulating brine is reduced after the circulating brine flows into refrigeration equipment, and then the circulating brine is introduced into a freezing steel pipe for reciprocating circulation to ensure the stratum freezing effect;
s3, arranging two layers of pressure balancers between the ground surface building and the freezing wall positioned at the upper part, wherein compressible flexible pipes are arranged outside the pressure balancers;
the connecting section of the pressure balancer and the working well adopts a steel pipe, so that the excavation stability of the opening is ensured; the liquid in the compressible flexible pipe is antifreeze salt water; monitoring pressure by a pressure balancer, and controlling the pressure by a linkage pressure pump;
the number of the pressure balancers in each layer is not less than two, and the specific number is determined by calculation according to the adjustable deformation of the balancers and the actual construction condition.
S4, adjusting the pressure in the pressure balancer in time through a pressure pump according to the pressure change of the liquid in the compressible flexible pipe to offset the additional force given to the ground by frost heaving and thawing deformation;
and S5, after the underground structure construction is frozen and gradually thawed, filling micro-expansion cement mortar into the pressure balancer to realize the complete solidification and reinforcement of the excavation section.
In this embodiment, specifically: in S2 and S3, in the process of freezing, synchronous operation is carried out through S4, the pressure in the compressible flexible pipe is adjusted according to the freezing process, and the influence of frost heaving and thaw collapse deformation on the ground is counteracted by the deformation of the compressible flexible pipe.
Example two
Referring to fig. 1-2, the present invention provides a technical solution: a municipal underground engineering construction method;
the method comprises the following steps:
s1, firstly, constructing a working well beside a surface building in advance, wherein the depth of the working well is equal to the bottom surface of an excavation section;
a low-temperature brine distributor, a low-temperature brine tank, refrigeration equipment and a pressure pump set are respectively installed at the representative positions of the working well;
the low-temperature brine distributor is communicated with the low-temperature brine tank and is driven by the pressure pump group; the method comprises the following steps of paving frozen steel pipes inside an external soil layer at a preset excavation section position, specifically to the upper part, the lower part, the left side and the right side of the preset excavation section and end parts possibly required according to actual construction conditions;
s2, reinforcing the stratum of the excavation section through a freezing method to form a temporary reinforcing body, so that a frozen wall is formed outside the excavation section, and constructing the excavation section;
particularly, the forming of a temporary reinforcing body is realized by matching refrigeration equipment with a freezing steel pipe; wherein, drilling a hole in the excavation surface of the excavation section, and arranging a freezing steel pipe, a liquid supply pipe and a liquid return pipe; the freezing effect of the stratum is ensured by introducing low-temperature brine;
in the actual use process, the flow is adjusted through a gate valve, the temperature of circulating brine is reduced after the circulating brine flows into refrigeration equipment, and then the circulating brine is led into a freezing steel pipe and circulates in a reciprocating manner to ensure the stratum freezing effect;
s3, arranging two layers of pressure balancers between the surface building and the freezing wall positioned at the upper part, wherein compressible flexible pipes are arranged outside the pressure balancers;
the connecting section of the pressure balancer and the working well adopts a steel pipe, so that the excavation stability of the opening is ensured; the liquid in the compressible flexible pipe is antifreeze salt water; monitoring pressure by a pressure balancer, and controlling the pressure by a linkage pressure pump;
the number of the pressure balancers in each layer is not less than two, and the specific number is determined by calculation according to the adjustable deformation of the balancers and the actual construction condition.
S4, according to the pressure change of the liquid in the compressible flexible pipe, the pressure in the pressure balancer is adjusted in time through the pressure pump, and the additional force given to the ground by frost heaving and thaw settlement deformation is counteracted;
and S5, completing the construction of the underground structure, and filling micro-expansion cement mortar into the pressure balancer after the frozen soil is gradually thawed to realize the complete solidification and reinforcement of the excavation section.
In this embodiment, specifically: in S2 and S3, in the process of freezing, synchronous operation is carried out with the freezing method through S4, the pressure in the compressible flexible pipe is adjusted according to the freezing process, and the influence of frost heaving and thaw collapse deformation on the ground is counteracted by using the deformation of the compressible flexible pipe.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A municipal underground engineering construction method is characterized by comprising the following steps:
s1, constructing a working well beside a surface building in advance, wherein the depth of the working well is equal to or deeper than the bottom surface of an excavation section;
s2, reinforcing the stratum of the excavation section by a freezing method to form a temporary reinforcing body, so that a frozen wall is formed outside the excavation section, and then constructing the excavation section;
s3, arranging a pressure balancer between the ground surface building and the freezing wall positioned at the upper part, wherein a compressible flexible pipe is arranged outside the pressure balancer;
s4, according to the pressure change of the liquid in the compressible flexible pipe, the pressure in the pressure balancer is adjusted in time through a pressure pump, and the additional force given to the ground by frost heaving and thaw settlement deformation is counteracted;
and S5, completing the construction of the underground structure, and filling micro-expansion cement mortar into the pressure balancer after the frozen soil is gradually thawed to realize the complete solidification and reinforcement of the excavation section.
2. The municipal underground engineering construction method according to claim 1, wherein: and S2, drilling holes in the excavation surface of the excavation section, arranging a steel pipe, arranging a liquid supply pipe and a liquid return pipe, and introducing low-temperature saline water to ensure the stratum freezing effect.
3. The municipal underground engineering construction method according to claim 2, wherein: the flow is regulated through the gate valve, the temperature of circulating brine is reduced after the circulating brine flows into the refrigeration equipment, and then the circulating brine flows into the freezing steel pipe to circulate in a reciprocating mode, so that the stratum freezing effect is guaranteed.
4. The municipal underground engineering construction method according to claim 1, wherein: in the S3, the pressure balancer is not less than two layers and symmetrically arranged on the upper freezing wall.
5. The municipal underground engineering construction method according to claim 4, wherein: in the S3, a steel pipe is adopted at the connection section of the pressure balancer and the working well; the liquid in the compressible flexible pipe is antifreeze saline; and monitoring the pressure by the pressure balancer, and controlling the pressure by linking the pressure pump.
6. The municipal underground engineering construction method according to any one of claims 1 to 5, wherein: in the S2 and the S3, when the freezing method is carried out, synchronous operation is carried out with the freezing method through the S4, the pressure in the pipe of the compressible flexible pipe is adjusted according to the freezing process, and the influence of frost heaving and thaw collapse deformation on the ground is counteracted by utilizing the deformation of the compressible flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211022618.9A CN115324588A (en) | 2022-08-25 | 2022-08-25 | Municipal underground engineering construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211022618.9A CN115324588A (en) | 2022-08-25 | 2022-08-25 | Municipal underground engineering construction method |
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| Publication Number | Publication Date |
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| CN115324588A true CN115324588A (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211022618.9A Pending CN115324588A (en) | 2022-08-25 | 2022-08-25 | Municipal underground engineering construction method |
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| Country | Link |
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| CN (1) | CN115324588A (en) |
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- 2022-08-25 CN CN202211022618.9A patent/CN115324588A/en active Pending
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