CN116163318A - Construction method and structure for foundation pit support of inserted section steel microorganism sand wall - Google Patents
Construction method and structure for foundation pit support of inserted section steel microorganism sand wall Download PDFInfo
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- CN116163318A CN116163318A CN202310449280.3A CN202310449280A CN116163318A CN 116163318 A CN116163318 A CN 116163318A CN 202310449280 A CN202310449280 A CN 202310449280A CN 116163318 A CN116163318 A CN 116163318A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
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Abstract
The invention discloses a construction method and a construction structure for foundation pit support of an inserted section steel microorganism sand wall, wherein the construction method comprises the following steps: step 1, determining the position of a foundation pit supporting structure in a construction site, and manufacturing a guide wall at the appointed position of the foundation pit supporting structure; step 2, preparing bacterial liquid and preparing cementing liquid; step 3, the main machine cutting box of the construction method transversely digs along the horizontal direction of the guide wall to cut soil, and a section of microbial sand wall is manufactured; step 4, repeating the step 2-3 until the positions of the guide wall or the foundation pit supporting structure are all formed into a microbial sand wall; step 5, inserting common I-shaped steel, inserting modified I-shaped steel after a plurality of common I-shaped steel are arranged at intervals, and inserting a thin steel plate between the two modified I-shaped steel; and 6, pulling out the thin steel plate after the foundation pit is excavated and the lower structure is built. The invention effectively improves the integrity of the supporting structure and the water stopping effect of the foundation pit.
Description
Technical Field
The invention belongs to the technical field of sand layer construction, and particularly relates to a construction method and a construction structure for foundation pit support of an inserted section steel microorganism sand wall.
Background
In recent years, with the rapid development of economy and the scale expansion of cities in China, the urban construction process is continuously accelerated, and more applications of high-rise buildings in cities are realized, so that foundation pits are widely applied to building construction. For some sandy soil areas, if the sandy soil layer is hidden with abundant groundwater, the high permeability of the sandy soil can greatly increase the construction difficulty of the deep foundation pit. At present, more construction technologies for treating related problems are similar to modes for treating soft soil bottom layers, a filling pile is mostly adopted as a supporting structure of a foundation pit in the foundation pit excavation of a sand soil layer, a waterproof curtain is additionally arranged on the filling pile, a dewatering well is arranged, and the foundation pit excavation construction is carried out. And by adopting a water stopping method such as setting a water stopping curtain or setting a dewatering well, the construction progress is slow, and the integrity of the supporting structure cannot be ensured.
Chinese patent publication No. CN 113123350A discloses a foundation pit supporting structure, which is a water-stopping structure arranged outside and surrounding the foundation pit, and the water-stopping structure adopts a water-stopping structure comprising two water-stopping curtains which are mutually sleeved and arranged at intervals to improve the water-stopping effect and the waterproof capability of the foundation pit.
The problem of later foundation pit loosening caused by the problem of easy water seepage of a sand layer is solved, the integrity of a supporting structure is guaranteed, the technology disclosed by the invention is not well solved, and the method is excessive in material consumption during construction, complex in construction, slow in construction process and influences the construction speed.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method and a construction structure for foundation pit support of an inserted section steel microorganism sand wall, so as to achieve the purposes of improving the integrity of the support structure and improving the water stopping effect of the foundation pit.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the construction method for foundation pit support of the inserted section steel microorganism sand wall specifically comprises the following steps:
step 4, repeating the step 2-3 until the positions of the guide wall or the foundation pit supporting structure are all formed into the microbial sand wall;
and 6, pulling out the thin steel plate after the foundation pit is excavated and the lower structure is built.
Further, in the step 2, in the preparation of the bacterial liquid, the components of the activation culture medium comprise 15g/L casein pancreatin, 5g/L soybean meal protease, 5g/L sodium chloride and 15g/L agar;
the culture solution comprises 20g/L yeast extract powder, 10g/L ammonium sulfate and 2g/L sodium hydroxide;
the components of the cementing liquid comprise 30g/L urea, 55g/L calcium chloride, 10g/L ammonium chloride, 3g/L nutrient broth and 2.12g/L sodium bicarbonate.
Further, in the step 2, the specific preparation method of the bacterial liquid comprises the following steps:
1) Aseptic treatment of an activation culture medium: placing the culture medium in an autoclave at 121 ℃, sterilizing the culture medium for 20min by high-temperature steam, and then naturally cooling the culture medium on a sterile operation table;
2) Inoculating and activating the bacillus caldarius in an activation medium: inoculating the sarcina bardana in a dry powder state in an activation culture medium, and then placing the inoculated activation culture medium in an air bath incubator for activation culture, wherein the set temperature of the air bath incubator is 30 ℃, and culturing for 24 hours;
3) Performing expansion culture on the activated bacteria: firstly, carrying out aseptic treatment on a culture solution, setting 121 ℃ in an autoclave, sterilizing for 20min through high-temperature steam, then naturally cooling the culture solution on an aseptic operation table, mixing the culture solution with activated bacteria after cooling, putting the mixture into an oscillator for constant-temperature oscillation, setting the temperature of the oscillator to be 30 ℃, and continuously carrying out oscillation culture at 160rpm for 24 hours, observing the culture solution, and carrying out amplification culture on the bacteria to obtain the bacterial solution after the white turbidity appears on the culture solution.
An inserted section steel microorganism sand wall foundation pit supporting structure is obtained by an inserted section steel microorganism sand wall foundation pit supporting construction method.
Further, the microbial sand wall foundation pit supporting structure of the inserted section steel comprises a microbial sand wall, wherein a plurality of modified I-shaped steel is longitudinally inserted into the microbial sand wall, and the modified I-shaped steel is formed by welding two buckles with opposite directions on two flanges of the common I-shaped steel; a thin steel plate is inserted into the buckle between the two adjacent refitted I-shaped steel; a plurality of common I-shaped steel is arranged between the two refitted I-shaped steel.
Further, the length of the buckle is the same as that of the refitted I-shaped steel.
Further, the length of the steel sheet is the same as that of the modified I-shaped steel, and the width of the steel sheet is the interval distance between the buckle at one side of the modified I-shaped steel and the buckle at the other side of the similar modified I-shaped steel.
Further, the steel sheet is a detachable structure.
Compared with the prior art, the invention has the beneficial effects that: the inserted steel-microorganism sand wall foundation pit supporting structure provided by the invention is combined with the construction method and the microorganism curing technology, the I-shaped steel and the thin steel plate are modified, the microorganism sand wall which can stop water and has enough rigidity can be manufactured on a sandy soil stratum, the principle is simple, the operation is easy, the feasibility is quite sufficient, meanwhile, compared with the conventional construction technology, the microorganism curing is more environment-friendly, the thin steel plate and the I-shaped steel are connected, so that the sand wall has better integrity, the thin steel plate plays a role in stopping water of the foundation pit, the waterproof and seepage-proofing performance is better, meanwhile, the thin steel plate can be pulled out for recycling after the construction is finished, the inserted steel-microorganism sand wall foundation pit supporting structure not only has enough rigidity to support the stability of the foundation pit, but also plays a role in stopping water, and the integral safety of the foundation pit is ensured.
Drawings
FIG. 1 is a flow chart of a construction method of a microbial sand wall foundation pit support of the invention;
FIG. 2 is a top view of a microbial sand wall foundation pit support structure of the present invention;
FIG. 3 is a schematic view of the structure of the microbial sand wall foundation pit supporting structure of the present invention when A-A section is inserted into a steel sheet;
FIG. 4 is a side view of a microbial sand wall foundation pit support structure of the present invention;
fig. 5 is an enlarged view of the structure of fig. 2 a.
Reference numerals: 1. microbial sand wall; 2. refitting I-shaped steel; 3. a thin steel plate; 4. a buckle; 5. ordinary I-shaped steel; 6. a soil layer in the foundation pit; 7. and (5) a soil layer outside the foundation pit.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that when an structure is referred to as being "connected to" another structure, it can be directly connected to the other structure or be indirectly connected to the other structure.
It should be understood that the terms "length," "width," "depth," "vertical," "horizontal," and the like indicate an orientation or positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Fig. 1 is a flow chart of a construction method of microbial sand wall foundation pit support, and the invention discloses a construction method of microbial sand wall foundation pit support by inserting section steel, which specifically comprises the following steps:
step 4, repeating the step 2-3, and constructing in a sectional mode until all guide walls and foundation pit supporting structure positions are piled by using a TRD construction method, namely all the guide walls or the foundation pit supporting structure positions form a microbial sand wall;
step 1-3 can refer to the construction flow of the TRD construction method, wherein the curing agent is replaced by the microbial liquid;
and 6, pulling out the thin steel plate 3 after the foundation pit is excavated and the lower structure is built. The thin steel plate 3 can be reused, and the resource utilization rate is improved.
In step 2, the components of the activation medium include 15g/L casein pancreatin, 5g/L soy flour protease, 5g/L sodium chloride, 15g/L agar; the culture solution comprises 20g/L yeast extract powder, 10g/L ammonium sulfate and 2g/L sodium hydroxide; the components of the cementing liquid comprise 30g/L urea, 55g/L calcium chloride, 10g/L ammonium chloride, 3g/L nutrient broth and 2.12g/L sodium bicarbonate.
In the step 2, the specific preparation method of the bacterial liquid comprises the following steps:
1) And (3) aseptic treatment of a culture medium: placing the culture medium in an autoclave at 121 ℃, sterilizing the culture medium for 20min by high-temperature steam, and then naturally cooling the culture medium on a sterile operation table;
2) Inoculating and activating the sarcina barbita in a dry powder state in an activated medium after aseptic treatment: transferring and inoculating the bacillus caldus lyophilized powder to an activation culture medium, placing the inoculated activation culture medium in an air bath incubator, setting the temperature to be 30 ℃, and culturing for 24 hours;
3) Performing expansion culture on the activated bacteria: performing expansion culture on activated bacteria by using a culture solution, performing aseptic treatment on the culture solution, setting 121 ℃ in an autoclave, sterilizing for 20min by high-temperature steam, naturally cooling the culture solution on an aseptic operation table, mixing the culture solution with activated bacteria after cooling, placing the mixture into an oscillator for constant-temperature oscillation, setting the temperature of the oscillator to be 30 ℃, and the oscillation speed to be 160rpm, observing the culture solution after continuous oscillation culture for 24 hours, wherein the culture solution is white turbid, and the bacteria are successfully expanded and cultured to obtain a bacterial solution; if the culture solution does not have white turbidity, continuing to culture until the white turbidity appears; if the culture solution does not have white turbidity, continuing to culture until the white turbidity appears.
The invention also discloses an inserted section steel microorganism sand wall foundation pit supporting structure, as shown in fig. 2-4, which comprises a microorganism sand wall 1, wherein a plurality of modified I-shaped steel 2 are longitudinally inserted into the microorganism sand wall 1, as shown in fig. 5, the modified I-shaped steel 2 is formed by welding two buckles 4 with opposite directions on two flanges of a common I-shaped steel 5; a thin steel plate 3 is inserted on a buckle 4 between two adjacent refitted I-shaped steel; a plurality of common I-shaped steel 5 are arranged between the two refitted I-shaped steel 2, and one refitted I-shaped steel is arranged in the embodiment in which two I-shaped steel are arranged.
In this embodiment, the length of the buckle 4 is the same as the length of the retrofit i-section steel 2.
In this embodiment, the length of the steel sheet 3 is the same as the length of the modified i-section steel 2, the width of the steel sheet 3 is the distance between the buckle at one side of the modified i-section steel 2 and the buckle at the other side of the similar modified i-section steel, and the steel sheet 3 is mainly used as a waterproof curtain to enhance the waterproof effect.
In this embodiment, the steel sheet 3 is a detachable structure, and after the pit is excavated and the lower structure is constructed, the steel sheet 3 can be pulled out for recycling.
The invention discloses a foundation pit supporting structure of an inserted steel section microbial sand wall, which combines the existing TRD construction method and microbial curing technology, and combines modified I-shaped steel and thin steel plates, so that a microbial sand wall which can stop water and has enough rigidity can be manufactured in a sandy soil stratum.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. The construction method for foundation pit support of the inserted section steel microorganism sand wall is characterized by comprising the following steps of:
step 1, determining a construction position of a foundation pit supporting structure at a construction site according to a construction drawing, manufacturing a guide wall at a designated construction position of the foundation pit supporting structure, performing construction of the foundation pit supporting structure according to guide wall positioning, vertically inserting a construction method cutting box into the construction site, and determining the insertion depth according to the depth of the foundation pit supporting structure;
step 2, preparing bacterial liquid and preparing cementing liquid, wherein the bacterial liquid is prepared by inoculating and activating dry powder state bacillus octazier in an activating culture medium, and then performing expansion culture in the culture liquid; the cementing liquid is prepared according to the equal proportion of the components;
step 3, the main machine cutting box of the construction method transversely tunnels along the horizontal direction of the guide wall to cut soil, meanwhile, the bacterial liquid is injected into the cut soil, after a section of horizontal cutting propulsion is completed, the main machine cutting box returns to the starting position from the ending position to tunnel, and the cementing liquid is injected in the process to complete the round-trip tunneling in the first stage; performing the second stage of round-trip tunneling, including performing two round-trip tunneling and injecting cementing liquid in the process, so as to perform round-trip horizontal tunneling for multiple times, and completing the manufacture of a section of microbial sand wall;
step 4, repeating the step 2-3 until the positions of the guide wall or the foundation pit supporting structure are all formed into the microbial sand wall;
step 5, inserting a plurality of common I-shaped steel in the formed micro-sand wall, inserting modified I-shaped steel after a plurality of common I-shaped steel are spaced, and inserting a thin steel plate between the two modified I-shaped steel, wherein the thin steel plate is used as a waterproof curtain;
and 6, pulling out the thin steel plate after the foundation pit is excavated and the lower structure is built.
2. The construction method for foundation pit support of the inserted section steel microorganism sand wall according to claim 1, wherein in the step 2, the components of the activating culture medium comprise 15g/L casein pancreatin, 5g/L soybean meal protease, 5g/L sodium chloride and 15g/L agar;
the culture solution comprises 20g/L yeast extract powder, 10g/L ammonium sulfate and 2g/L sodium hydroxide;
the components of the cementing liquid comprise 30g/L urea, 55g/L calcium chloride, 10g/L ammonium chloride, 3g/L nutrient broth and 2.12g/L sodium bicarbonate.
3. The construction method for foundation pit support of the inserted section steel microorganism sand wall according to claim 1 or 2, wherein in the step 2, the specific preparation method of the bacterial liquid comprises the following steps:
1) Aseptic treatment of an activation culture medium: placing the culture medium in an autoclave at 121 ℃, sterilizing the culture medium for 20min by high-temperature steam, and then naturally cooling the culture medium on a sterile operation table;
2) Inoculating and activating the bacillus caldarius in an activation medium: inoculating the sarcina bardana in a dry powder state in an activation culture medium, and then placing the inoculated activation culture medium in an air bath incubator for activation culture, wherein the set temperature of the air bath incubator is 30 ℃, and culturing for 24 hours;
3) Performing expansion culture on the activated bacteria: firstly, carrying out aseptic treatment on a culture solution, setting 121 ℃ in an autoclave, sterilizing for 20min through high-temperature steam, then naturally cooling the culture solution on an aseptic operation table, mixing the culture solution with activated bacteria after cooling, putting the mixture into an oscillator for constant-temperature oscillation, setting the temperature of the oscillator to be 30 ℃, and continuously carrying out oscillation culture at 160rpm for 24 hours, observing the culture solution, and carrying out amplification culture on the bacteria to obtain the bacterial solution after the white turbidity appears on the culture solution.
4. An interpolated steel microbial sand wall foundation pit supporting structure, which is characterized in that the supporting structure is obtained by adopting the construction method for the interpolated steel microbial sand wall foundation pit according to any one of claims 1-3.
5. The microbial sand wall foundation pit supporting structure for the inserted section steel of claim 4, comprising a microbial sand wall, wherein a plurality of modified I-shaped steel is longitudinally inserted in the microbial sand wall, and the modified I-shaped steel is formed by welding two buckles with opposite directions on two flanges of the common I-shaped steel; a thin steel plate is inserted into the buckle between the two adjacent refitted I-shaped steel; a plurality of common I-shaped steel is arranged between the two refitted I-shaped steel.
6. The microbial sand wall foundation pit supporting structure for inserted steel sections of claim 5, wherein the length of the buckle is the same as the length of the modified I-shaped steel.
7. The microbial sand wall foundation pit supporting structure of inserted steel section of claim 5, wherein the length of the steel sheet is the same as the length of the modified i-section steel, and the width of the steel sheet is the distance between the buckle at one side of the modified i-section steel and the buckle at the other side of the similar modified i-section steel.
8. The microbial sand wall foundation pit supporting structure for inserted steel sections of claim 4, wherein said steel sheet is a detachable structure.
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