CN109322311B - Prefabricated underground continuous wall structure-based assembled supporting structure construction process - Google Patents
Prefabricated underground continuous wall structure-based assembled supporting structure construction process Download PDFInfo
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Abstract
The invention discloses an assembly type supporting structure construction process based on a prefabricated underground continuous wall structure, which belongs to the technical field of supporting structure construction, and comprises the following steps: the method comprises the steps of excavating a guide wall groove, building a supporting guide wall, constructing supporting grooves, prefabricating an underground continuous wall plate, hanging the prefabricated wall plate, grouting on the side of a toe wall, and realizing the prefabricated underground continuous wall plate.
Description
Technical Field
The invention relates to the technical field of supporting structure construction, in particular to an assembly type supporting structure construction process based on a prefabricated underground continuous wall structure.
Background
The assembled supporting structure is mainly formed by prefabricated components and is assembled on site through various technical means to form the supporting structure. Compared with the conventional supporting means, the supporting technology has the characteristics of low manufacturing cost, short construction period, easy quality control and the like, thereby greatly reducing the energy consumption and the construction waste, having higher social and economic benefits and environmental protection, and having a mature assembly type supporting structure in the market at present: the precast pile is mainly used as a foundation pit supporting structure by adopting a conventional precast pile construction method, such as static pressure or hammering construction, and can also be used for forming a continuous cement-soil composite supporting structure by adopting a disassembled cement-soil mixing pile and a TRD mixing wall or CSM double-wheel milling mixing wall. When the prestressed precast pile is used for a supporting structure, attention should be paid to prevent the prestressed precast pile from brittle failure and ensure the construction quality of a joint.
The existing supporting structures mostly adopt supporting methods such as short column diaphragm plate supporting, temporary retaining wall supporting, inclined column supporting, anchor pulling supporting and the like, the application range of the supporting structures is very small, the supporting structures can only be suitable for foundation pits with the excavation depth less than seven meters and without special requirements, the foundation pits with the excavation depth more than ten meters and adjacent buildings and important facilities within the excavation depth generally adopt a construction mode of combining a partial supporting structure with a foundation structure, most adopt the construction engineering of taking an underground continuous wall as a supporting structure main body, but the construction engineering taking the underground continuous wall as the supporting structure main body has great construction difficulty and can not be used under some special conditions, such as soft geological mucky soil, flushing layer containing boulder, rock and the like, and the problems that adjacent wall sections can not be aligned and leak water easily occur.
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide an assembly type supporting structure construction process based on a prefabricated underground continuous wall structure, which can realize the construction mode that an underground continuous wall plate is prefabricated, the assembly type supporting structure is used for supporting, the underground continuous wall is convenient to be used as the joint of a supporting structure and a foundation structure, meanwhile, the special circulating slurry resists the lateral soil pressure and water pressure acting on the tank wall to prevent the tank wall from collapsing and peeling, simultaneously prevents the infiltration of underground water, forms a layer of mud skin with low water permeability on the wall of the tank by circulating mud, can prevent the wall of the tank from peeling off, after the grouting is finished at the toe wall side, the circulating slurry is in a solid state under the pressure after forming, the gap at the joint of the underground continuous wall plate is filled, meanwhile, under the forming pressure, the silicon-based growth small balls consume water at gaps to adhere and fix the circulating slurry.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
An assembly type supporting structure construction process based on a prefabricated underground continuous wall structure comprises the following steps:
the method comprises the following steps: excavating a guide wall groove, wherein a worker excavates the guide wall groove by using a small excavator, and a construction worker is matched with the guide wall groove to clear the bottom of the guide wall groove and tamp the base of the guide wall groove;
step two: building a supporting guide wall, paving cement mortar with the thickness of seven centimeters in a groove of the guide wall, using a wood template for supporting in the concrete pouring process, making the top surface of the guide wall horizontal, setting an upper square wood and a lower square wood with the thickness of one meter as inner supports every two meters in the longitudinal direction of the removed template, and supporting two guide walls;
step three: supporting grooving construction, enabling a grab bucket of a grooving machine to be parallel to a guide wall, enabling the center line of the grab bucket to be superposed with the center line of the guide wall, and excavating a grooving machine;
step four: prefabricating the underground continuous wall plate, reasonably determining the width of the underground continuous wall and the length of a prefabricated member by technicians according to the capacity of transportation and hoisting equipment, construction site roads and stacking site conditions, wherein the width of the wall body width meets the stability requirement of grooving;
step five: hoisting the prefabricated wall board, vertically hoisting the underground continuous wall board by a hoisting machine, and placing the wall of the extended groove downwards;
step six: the method comprises the steps of grouting the side of the wall toe wall, grouting the prefabricated wall board into a groove after the prefabricated wall board is placed in the groove, so that the prefabricated underground continuous wall board can be realized, supporting by using an assembled supporting structure, the underground continuous wall board can be conveniently used as a construction mode for connecting the supporting structure and a foundation structure, meanwhile, lateral soil pressure and water pressure acting on the groove wall are resisted through specially-made circulating slurry, the groove wall is prevented from collapsing and peeling, underground water is prevented from permeating, the circulating slurry forms a layer of mud skin with low water permeability on the groove wall, the groove wall can be prevented from peeling, after grouting on the side of the wall toe wall is completed, the circulating slurry is in a solid state under the formed pressure, gaps at the connecting part of the underground continuous wall board are filled, and meanwhile, water in the gaps generated by growth of silicon-based globules is used for adhering and.
Furthermore, in the hoisting process of the prefabricated wall panel in the fifth step, before the wall panel is hoisted into the grooving by the hoisting machine, a proper amount of broken stone is thrown into the bottom of the grooving, and the prefabricated wall panel is slowly hoisted, so that the prefabricated wall panel is compacted into the broken stone at the bottom of the grooving, and the pressure of the prefabricated wall panel on the bottom of the grooving is conveniently reduced.
Furthermore, in the process of building the supporting and guiding wall in the second step, after the concrete pouring is finished, the maintenance frame is arranged around the guiding wall, and the construction joint of the guiding wall is staggered with the joint of the underground wall, so that the damage of other construction personnel to the supporting enclosing wall is reduced.
Furthermore, in the process of building the supporting guide wall in the second step, the supporting guide wall is constructed in sections, the length of each section is controlled to be forty meters according to the length of the template and the specification requirement, and the distance between the supporting guide wall and the section is convenient to control.
Furthermore, in the supporting grooving construction process in the third step, after the grooving machine excavates the grooving, a technician uses an ultrasonic detector to check the grooving quality, so that the inside of the grooving is conveniently checked, and the technician can conveniently find the wall defects of the grooving.
Furthermore, in the process of prefabricating the underground continuous wall board in the fourth step, the manufacturing method of the underground continuous wall board is lamination manufacturing, and the number of laminations is two, so that the underground continuous wall board can be manufactured quickly by using lamination manufacturing.
Furthermore, in the supporting grooving construction process in the third step, before the grooving machine excavates the grooving, circulating slurry is injected into the guide wall groove, and along with the continuous downward excavation of the grooving machine, the circulating slurry is continuously injected into the unformed grooving, so that the lateral soil pressure and the water pressure acting on the groove wall can be conveniently resisted.
Further, the concrete parameters of the circulating slurry used in the construction process of supporting and grooving in the third step are that the specific gravity of the slurry is 1.05-1.25, the viscosity is 22s-40s, the colloid rate is more than 98%, the thickness of the mud skin is less than 3mm, the pH value is 8-11, the sand content is less than 7%, the collapse and the peeling of the wall of the tank are prevented conveniently, and meanwhile, the infiltration of underground water is prevented.
Furthermore, the main components of the circulating slurry are bentonite and water, the bentonite and the water are added in a slurry mixing pool and then stirred and mixed, and chemical fiber melt, lignosulfonate, composite phosphate, carboxymethyl cellulose, a weighting agent and a leakage-proof agent are added in batches in the stirring process, so that the circulating slurry is in a solid state under the pressure after forming after grouting on the toe wall side.
Further, silicon-based growth globules are filled in the circulating slurry, the silicon-based growth globules are densely arranged in the circulating slurry, gel films are arranged on the outer layers of the silicon-based growth globules, silicon-based lubricating grease is filled in the gel films, flocculant-producing bacterium globules and silicon-hydrocarbon bacterium globules are filled in the gel films, the flocculant-producing bacterium globules and the silicon-hydrocarbon bacterium globules are uniformly arranged in the silicon-based lubricating grease, and the circulating slurry is adhered and fixed by water at the gap positions consumed by the silicon-based growth globules under the forming pressure.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can realize the prefabricated underground continuous wall board, uses the assembled supporting structure for supporting, is convenient to use the underground continuous wall as a construction mode for connecting the supporting structure and the foundation structure, resists lateral soil pressure and water pressure acting on the groove wall by specially-made circulating slurry, prevents the groove wall from collapsing and peeling off, simultaneously prevents underground water from permeating, forms a layer of mud skin with low water permeability on the groove wall by the circulating slurry, can prevent the groove wall from peeling off, and fills the gap at the joint of the underground continuous wall board after the grouting at the toe wall side is finished and the circulating slurry is in a solid state under the formed pressure, and simultaneously, under the formed pressure, the water at the gap consumed by the silicon-based growing small balls adheres and fixes the circulating slurry.
(2) And fifthly, in the hoisting process of the prefabricated wall panel, before the wall panel is hoisted into the groove by a hoisting machine, a proper amount of broken stone is thrown into the bottom of the groove, and the prefabricated wall panel is slowly hoisted, so that the prefabricated wall panel is compacted into the broken stone at the bottom of the groove, and the pressure of the prefabricated wall panel on the bottom of the groove is conveniently reduced.
(3) And in the process of building the supporting and guiding wall in the second step, after the concrete pouring is finished, the maintenance frame is arranged around the guiding wall, and the construction joint of the guiding wall is staggered with the joint of the underground wall, so that the damage of other construction personnel to the supporting enclosing wall is reduced.
(4) And step two, in the process of constructing the supporting guide wall, the supporting guide wall is constructed in sections, the length of each section is controlled to be forty meters according to the length of the template and the specification requirement, and the distance of the supporting guide wall is convenient to control.
(5) In the support grooving construction process in the third step, after the grooving machine excavates the grooving, a technician uses an ultrasonic detector to check the grooving quality, so that the inside of the grooving is conveniently checked, and the technician can conveniently find the wall defects of the grooving.
(6) And in the process of prefabricating the underground continuous wall board, the manufacturing method of the underground continuous wall board is lamination manufacturing, and the number of laminations is two, so that the underground continuous wall board can be manufactured quickly by using lamination manufacturing.
(7) And in the process of supporting grooving construction, before the grooving machine excavates the grooving, circulating slurry is injected into the guide wall groove, and the circulating slurry is continuously injected into the unformed grooving along with the continuous downward excavation of the grooving machine, so that the side soil pressure and the water pressure acting on the groove wall can be conveniently resisted.
(8) The concrete parameters of the circulating slurry used in the supporting and grooving construction process in the third step are that the specific gravity of the slurry is 1.05-1.25, the viscosity is 22s-40s, the colloid rate is more than 98%, the thickness of the mud skin is less than 3mm, the pH value is 8-11, the sand content is less than 7%, the collapse and the peeling of the wall of the tank are conveniently prevented, and meanwhile, the infiltration of underground water is prevented.
(9) The main components of the circulating slurry are bentonite and water, the bentonite and the water are added into a slurry mixing pool and then stirred and mixed, and chemical fiber melt, lignosulfonate, composite phosphate, carboxymethyl cellulose, weighting agent and leakage-proof agent are added in batches during stirring, so that the circulating slurry is in a solid state under the pressure after forming after grouting on the side of the toe wall.
(10) The circulating slurry is filled with silicon-based growth pellets which are densely arranged in the circulating slurry, a gel film is arranged on the outer layer of the silicon-based growth pellets, silicon-based lubricating grease is filled in the gel film, flocculant-producing bacterium seed balls and silicon-hydrocarbon bacterium seed balls are filled in the gel film, the flocculant-producing bacterium seed balls and the silicon-hydrocarbon bacterium seed balls are uniformly arranged in the silicon-based lubricating grease, and the circulating slurry is adhered and fixed by water at gaps consumed by the silicon-based growth pellets under the forming pressure.
Drawings
FIG. 1 is a main process flow diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Example 1:
referring to fig. 1, the construction process of the fabricated supporting structure based on the prefabricated underground continuous wall structure includes the following steps:
the method comprises the following steps: excavating a guide wall groove, wherein a worker excavates the guide wall groove by using a small excavator, and a construction worker is matched with the guide wall groove to clear the bottom of the guide wall groove and tamp the base of the guide wall groove;
step two: building a supporting guide wall, paving cement mortar with the thickness of seven centimeters in a groove of the guide wall, using a wood template for supporting in the concrete pouring process, making the top surface of the guide wall horizontal, after the template is removed, additionally arranging an upper square wood and a lower square wood with the thickness of one meter at intervals of two meters in the longitudinal direction of the guide wall as inner supports, supporting two guide walls, after the concrete pouring is finished, arranging maintenance frames around the guide wall, and staggering construction joints of the guide wall and an underground wall, so that the damage of other constructors to the supporting enclosure wall is reduced, in the second step of building the supporting guide wall, performing segmental construction on the supporting guide wall, and controlling the segmental length to be forty meters according to the length and specification requirements of the template, so that the distance of the supporting guide wall is conveniently controlled;
step three: supporting grooving construction, enabling a grab bucket of a grooving machine to be parallel to a guide wall, enabling the central line of the grab bucket to coincide with the central line of the guide wall, excavating the grooving by the grooving machine, after excavating the grooving by the grooving machine, using an ultrasonic detector to inspect the grooving quality by a technician, facilitating the inspection of the inside of the grooving, facilitating the finding of the wall defect of the grooving by the technician, before excavating the grooving by the grooving machine, injecting circulating slurry into a groove of the guide wall, and continuously downwards excavating along with the grooving machine, continuously injecting circulating slurry into the unformed grooving, facilitating the resistance of lateral soil pressure and water pressure acting on the groove wall;
step four: in the step four, in the process of prefabricating the underground continuous wall boards, the manufacturing method of the underground continuous wall boards is lamination manufacturing, and the number of laminations is two, so that the underground continuous wall boards can be manufactured quickly by using lamination manufacturing;
step five: hoisting the prefabricated wall panel, vertically hoisting the underground continuous wall panel by a hoisting machine, and placing the wall of the trenching tank downwards;
step six: the method comprises the steps of grouting the side of the wall toe wall, grouting the prefabricated wall board into a groove after the prefabricated wall board is placed in the groove, so that the prefabricated underground continuous wall board can be realized, supporting by using an assembled supporting structure, the underground continuous wall board can be conveniently used as a construction mode for connecting the supporting structure and a foundation structure, meanwhile, lateral soil pressure and water pressure acting on the groove wall are resisted through specially-made circulating slurry, the groove wall is prevented from collapsing and peeling, underground water is prevented from permeating, the circulating slurry forms a layer of mud skin with low water permeability on the groove wall, the groove wall can be prevented from peeling, after grouting on the side of the wall toe wall is completed, the circulating slurry is in a solid state under the formed pressure, gaps at the connecting part of the underground continuous wall board are filled, and meanwhile, water in the gaps generated by growth of silicon-based globules is used for adhering and.
The concrete parameters of the circulating slurry used in the supporting and grooving construction process in the third step are that the specific gravity of the slurry is 1.05-1.25, the viscosity is 22s-40s, the colloid rate is more than 98%, the thickness of the mud skin is less than 3mm, the pH value is 8-11, the sand content is less than 7%, the collapse and the peeling of the wall of the tank are conveniently prevented, and meanwhile, the infiltration of underground water is prevented.
The main components of the circulating mud are bentonite and water, the bentonite and the water are added into a mud mixing pool and then stirred and mixed, adding chemical fiber melt, lignosulfonate, composite phosphate, carboxymethyl cellulose, weighting agent and leakage-proof agent in batches during stirring, facilitating grouting on the toe wall side, the circulating slurry is in a solid state under the pressure after forming, silicon-based growth pellets are filled in the circulating slurry and are densely arranged in the circulating slurry, gel films are arranged on the outer layers of the silicon-based growth pellets, silicon-based lubricating grease is filled in the gel films, flocculant-producing bacterium pellets and silicon-hydrocarbon bacterium pellets are filled in the gel films, the flocculant-producing bacterium pellets and the silicon-hydrocarbon bacterium pellets are uniformly arranged in the silicon-based lubricating grease, and the circulating slurry is adhered and fixed by the water at the gaps consumed by the silicon-based growth pellets under the forming pressure.
The invention can realize the prefabricated underground continuous wall board, uses the assembled supporting structure for supporting, is convenient to use the underground continuous wall as the construction mode of the joint of the supporting structure and the foundation structure, resists the lateral soil pressure and water pressure acting on the groove wall by specially-made circulating slurry, prevents the groove wall from collapsing and peeling off, simultaneously prevents underground water from permeating, forms a layer of mud skin with very low water permeability on the groove wall by the circulating slurry, can prevent the groove wall from peeling off, and fills the gap at the joint of the underground continuous wall board after the grouting at the toe wall side of the wall is finished and the circulating slurry is in a solid state under the formed pressure, and simultaneously, under the formed pressure, the water at the gap is consumed by the silicon-based growth globules to adhere and fix the circulating slurry.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (9)
1. Assembly type supporting structure construction technology based on prefabricated underground continuous wall structure, its characterized in that: the method comprises the following steps:
the method comprises the following steps: excavating a guide wall groove, wherein a worker excavates the guide wall groove by using a small excavator, and a construction worker is matched with the guide wall groove to clear the bottom of the guide wall groove and tamp the base of the guide wall groove;
step two: building a supporting guide wall, paving cement mortar with the thickness of seven centimeters in a groove of the guide wall, using a wood template for supporting in the concrete pouring process, making the top surface of the guide wall horizontal, setting an upper square wood and a lower square wood with the thickness of one meter as inner supports every two meters in the longitudinal direction of the removed template, and supporting two guide walls;
step three: supporting grooving construction, enabling a grab bucket of a grooving machine to be parallel to a guide wall, enabling the center line of the grab bucket to be superposed with the center line of the guide wall, and excavating a grooving machine;
step four: prefabricating the underground continuous wall plate, reasonably determining the width of the underground continuous wall and the length of a prefabricated member by technicians according to the capacity of transportation and hoisting equipment, construction site roads and stacking site conditions, wherein the width of the wall body width meets the stability requirement of grooving;
step five: hoisting the prefabricated wall board, vertically hoisting the prefabricated wall board by a hoisting machine, and placing the prefabricated wall board downwards along the wall of the grooving groove;
step six: grouting the toe wall side, and after the prefabricated wall board is placed in the groove, grouting into the groove; wherein the content of the first and second substances,
in the third step of supporting grooving construction, before grooving is carried out by a grooving machine, circulating slurry is injected into a guide wall groove, after grouting is finished on the toe wall side of the wall, silicon-based growth small balls are filled in the circulating slurry, the silicon-based growth small balls are densely distributed in the circulating slurry, the circulating slurry is in a solid state under the formed pressure, gaps at the joints of the underground continuous wall boards are filled, and meanwhile, under the formed pressure, the silicon-based growth small balls consume water at the gaps to adhere and fix the circulating slurry;
the outer layer of the silicon-based growth ball is provided with a gel film, the gel film is filled with silicon-based lubricating grease, the gel film is filled with flocculant-producing bacterial seed balls and silicon-hydrocarbon bacterial seed balls, the flocculant-producing bacterial seed balls and the silicon-hydrocarbon bacterial seed balls are uniformly distributed in the silicon-based lubricating grease, and under the forming pressure, the water at the gap consumed by the silicon-based growth ball is fixed by circulating mud.
2. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: and in the hoisting process of the prefabricated wall panel in the step five, before the wall panel is hoisted into the groove by a hoisting machine, a proper amount of crushed stone is thrown into the bottom of the groove, and the prefabricated wall panel is slowly hoisted to compact the crushed stone at the bottom of the groove.
3. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: in the process of building the supporting guide wall in the second step, after the concrete pouring is finished, a maintenance frame is arranged around the guide wall, and the construction joint of the guide wall is staggered with the joint of the underground wall.
4. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: and in the second step, in the process of constructing the supporting guide wall, the supporting guide wall is constructed in sections, and the length of each section is controlled to be forty meters according to the length of the template and the specification requirement.
5. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: in the third step of supporting grooving construction, after the grooving machine excavates the grooving, a technician uses an ultrasonic detector to check the grooving quality.
6. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: in the step four, in the process of prefabricating the underground continuous wallboard, the manufacturing method of the underground continuous wallboard is lamination manufacturing, and the number of the laminations is two.
7. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 1, which is characterized in that: and in the step three, in the support grooving construction process, before the grooving machine excavates the grooving, circulating slurry is injected into the guide wall groove, and the circulating slurry is continuously injected into the unformed grooving along with the continuous downward excavation of the grooving machine.
8. The prefabricated underground continuous wall structure-based fabricated supporting structure construction process of claim 7, wherein: the concrete parameters of the circulating slurry used in the supporting and grooving construction process in the third step are that the specific gravity of the slurry is 1.05-1.25, the viscosity is 22s-40s, the colloid rate is more than 98%, the thickness of the mud skin is less than 3mm, the pH value is 8-11, and the sand content is less than 7%.
9. The construction process of an assembled supporting structure based on a prefabricated underground diaphragm wall structure according to claim 8, wherein: the main components of the circulating mud are bentonite and water, the bentonite and the water are added in a mud mixing pool and then stirred and mixed, and chemical fiber melt, lignosulfonate, composite phosphate, carboxymethyl cellulose, weighting agent and leakage preventive are added in batches in the stirring process.
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