CN111236262A - CSM + TRD underground continuous wall comprehensive construction method - Google Patents
CSM + TRD underground continuous wall comprehensive construction method Download PDFInfo
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- CN111236262A CN111236262A CN202010182260.0A CN202010182260A CN111236262A CN 111236262 A CN111236262 A CN 111236262A CN 202010182260 A CN202010182260 A CN 202010182260A CN 111236262 A CN111236262 A CN 111236262A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention discloses a CSM + TRD underground continuous wall comprehensive construction method which comprises the steps of deepening design, positioning measurement paying off, guide groove excavation, double-wheel milling cutting, cleaning pebbles by a grab bucket trenching machine, backfilling plain soil, TRD forward cutting, TRD return stirring, TRD stirring and grouting wall forming, H-shaped steel insertion, crown beam construction and H-shaped steel recovery. The invention has the beneficial effects that: the safety and reliability are high, the large-section H-shaped steel is used as a main supporting stress member to be matched with the prestressed anchor rods to bear the force together, and the safety and reliability are high compared with the traditional slope protection pile process; the inserted section steel can be recycled, the use of materials such as traditional concrete is reduced, and the requirement of green construction is met; the undisturbed soil is injected into the cement and stirred and then inserted into the H-shaped steel, so that the time for rotary drilling, reinforcement cage processing, concrete pouring and the like in the traditional process is reduced, and the construction period is saved by more than 20 days compared with the traditional process; the main materials are the leased H-shaped steel, the undisturbed soil and part of cement, the use of concrete and steel bars is reduced compared with the traditional process, and the construction cost is low.
Description
Technical Field
The invention relates to a construction method of an underground diaphragm wall, in particular to a CSM + TRD underground diaphragm wall comprehensive construction method, and belongs to the technical field of foundation pit supporting engineering.
Background
With the acceleration of the urban construction process in China, the density of buildings is getting larger and larger, deep foundation pit projects are increasing day by day, high water level areas have higher and higher requirements on foundation pit supporting engineering, the traditional process adopts forms of slope protection piles, three-shaft stirring piles, interlocking piles and the like, the water stop effect, the verticality and the wall forming quality are difficult to control, and the defect of low construction efficiency exists particularly on hard and complex geology, for the existing construction technology, the double-wheel milling deep layer stirring technology is taken as a cement soil deep layer stirring technology newly developed internationally, and is widely applied in a plurality of fields (such as foundation pit engineering, seepage-proofing engineering, foundation treatment and the like) at present, the chain cutter type continuous wall technology can better realize underground continuous grooving stirring wall forming under various complex geological conditions, can effectively solve the problems of peripheral supporting, pressure bearing, seepage-proofing and water stopping of foundation pits, dams and the like, however, at present, the two technologies cannot be combined for construction, so that the problem of construction of foundation pit support piles of large-particle-size pebble beds and gravel beds cannot be solved well.
Disclosure of Invention
The invention aims to solve the problems and provide a CSM + TRD underground continuous wall comprehensive construction method.
The invention realizes the purpose through the following technical scheme: a CSM + TRD underground continuous wall comprehensive construction method comprises the following steps:
the method comprises the following steps of firstly, deepening design, namely deepening design of a soil layer construction section according to geological conditions reported by a geological survey;
positioning, measuring and setting out, namely drawing a foundation pit supporting and setting out diagram according to coordinates and elevation control points provided by a surveying and mapping company, determining a central line and inner and outer side lines of the underground continuous wall by a professional measurer, and positioning a construction control line at the outer side of the foundation pit to serve as a control line of the whole foundation pit supporting construction;
step three, excavating a guide groove, namely excavating the guide groove by adopting a PC200 back-shovel excavator;
step four, double-wheel milling cutting, aligning a milling wheel of double-wheel milling mechanical equipment with a side line of the underground continuous wall, determining the position, then continuously enabling a milling head of the double-wheel milling equipment to go deep into the underground, injecting water and high-pressure air while stirring the double wheels, cutting a soil body to form cement-soil slurry of a rectangular groove section, ensuring that the specific gravity of the slurry is not more than 1.3, and stopping the double-wheel milling equipment from cutting until a pebble layer stops;
the plane tolerance deviation of the milling wheel is not more than +/-30 mm, the verticality deviation of the mast is controlled to be 1/300, the digging sinking speed is not more than 1.2m/min, the lifting speed is not more than 1.8m/min, during lifting, negative pressure cannot be generated in a hole to cause excessive disturbance of a surrounding soil body, the rotation speed and the lifting speed of the milling wheel are matched with each other, and the soil body and a curing agent can be cut and mixed sufficiently;
cleaning pebbles by using a grab bucket trenching machine, grabbing the pebbles by using a GB46 hydraulic grab bucket trenching machine, cleaning a pebble layer and grabbing the pebble layer to a gravel layer;
backfilling plain soil, namely backfilling the plain soil after the grab bucket grabs the plain soil, filling the wall forming groove with the backfilled plain soil, wherein the compaction coefficient of the backfilled plain soil is determined according to the doping amount of cement;
seventhly, carrying out forward cutting on the TRD, cutting to a designed depth after the TRD equipment is installed in place, and re-cutting the backfilled plain soil;
eighthly, performing TRD return-stroke stirring, namely performing return-stroke stirring after the TRD equipment finishes forward cutting;
step nine, TRD stirring and grouting wall forming, and grouting stirring is carried out after TRD return stroke stirring is finished;
the advancing speed of grouting stirring is determined according to the grouting amount, and when the cement mixing amount is 25%, the volume of a groove section corresponding to the grouting amount in unit time and unit travel time is calculated to determine the advancing speed;
step ten, inserting H-shaped steel, wherein the H-shaped steel is inserted in 30min after the construction of the underground continuous wall is finished, and the H-shaped steel is inserted by adopting a firm positioning clamp;
step eleven, constructing the crown beam, processing the steel bars according to design requirements, confirming the binding sequence of the steel bars according to a drawing, binding the steel bars in place according to the design of the drawing after positioning and paying off are finished, supporting the crown beam template on the outer side of the steel bars, backfilling and tamping the lower part of plain soil, and paving a plastic film;
and step twelve, recovering the H-shaped steel, wherein the H-shaped steel is pulled out and recovered by a special hydraulic pulling machine, and gaps formed after the H-shaped steel is pulled out are timely backfilled by fine sand and cement grout.
As a still further scheme of the invention: in the first step, the soil layer is divided into a soft soil layer, a pebble layer and a gravel layer, the soft soil layer is cut by adopting a double-wheel milling deep-layer stirring technology, the pebble layer is grabbed out by adopting a grab grooving machine, and the gravel layer is constructed by adopting the grab grooving machine.
As a still further scheme of the invention: in the third step, the width of the guide groove excavation is 0.8m, the depth is 1m, and the guide groove excavation is arranged along the wall body.
As a still further scheme of the invention: in the fourth step, the allowable deviation of the milling wheel plane is not more than +/-30 mm, the verticality deviation of the mast is controlled at 1/300, the digging sinking speed is not more than 1.2m/min, and the lifting speed is not more than 1.8 m/min.
As a still further scheme of the invention: in the fourth step, the double-wheel milling machine lifts the drill rod moving milling head back and forth while injecting high-pressure air in the cutting and tunneling construction process.
As a still further scheme of the invention: and step five, strictly controlling the sinking position deviation of the grab bucket in the pebble cleaning process of the grab bucket trenching machine.
As a still further scheme of the invention: in the seventh step, the advancing speed is controlled to be 3 cm/min-5 cm/min.
As a still further scheme of the invention: and step eight, mixing the plain soil and the cement soil slurry again through return stirring, wherein the return traveling speed is controlled within 8 cm/min.
As a still further scheme of the invention: and ten steps, in the inserting process of the H-shaped steel, the lower opening of the H-shaped steel is controlled by a positioning card, and two theodolites are arranged at the upper part in the X direction and the Y direction.
The invention has the beneficial effects that: the CSM + TRD underground continuous wall comprehensive construction method is reasonable in design:
1. the safety and reliability are high, the large-section H-shaped steel is used as a main supporting stress member to be matched with the prestressed anchor rods to bear the force together, and the safety and reliability are high compared with the traditional slope protection pile process;
2. the method is green and environment-friendly, the equipment cutting and tunneling process completely enters the cutting and tunneling ditch, the noise and vibration are greatly reduced, the dust control effect is good, the inserted profile steel can be recycled, the use of the traditional materials such as concrete is reduced, and the requirement of green construction is met;
3. the construction period is fast, the undisturbed soil is injected into the cement and stirred and then is inserted into the H-shaped steel, so that the time for rotary drilling, reinforcement cage processing, concrete pouring and the like in the traditional process is greatly reduced, and the construction period is saved by more than 20 days compared with the traditional process;
4. the construction cost is low, and this technique adopts the main material to lease H shaped steel, undisturbed soil and partial cement, reduces the use of concrete, reinforcing bar than traditional technology, and the construction cost is low.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a comprehensive construction method of "CSM + TRD" underground diaphragm wall includes the following steps:
the method comprises the following steps of firstly, deepening design, namely deepening design of a soil layer construction section according to geological conditions reported by a geological survey;
positioning, measuring and setting out, namely drawing a foundation pit supporting and setting out diagram according to coordinates and elevation control points provided by a surveying and mapping company, determining a central line and inner and outer side lines of the underground continuous wall by a professional measurer, and positioning a construction control line at the outer side of the foundation pit to serve as a control line of the whole foundation pit supporting construction;
step three, excavating a guide groove, namely excavating the guide groove by adopting a PC200 back-shovel excavator;
step four, double-wheel milling cutting, aligning a milling wheel of double-wheel milling mechanical equipment with a side line of the underground continuous wall, determining the position, then continuously enabling a milling head of the double-wheel milling equipment to go deep into the underground, injecting water and high-pressure air while stirring the double wheels, cutting a soil body to form cement-soil slurry of a rectangular groove section, ensuring that the specific gravity of the slurry is not more than 1.3, and stopping the double-wheel milling equipment from cutting until a pebble layer stops;
the plane tolerance deviation of the milling wheel is not more than +/-30 mm, the verticality deviation of the mast is controlled to be 1/300, the digging sinking speed is not more than 1.2m/min, the lifting speed is not more than 1.8m/min, during lifting, negative pressure cannot be generated in a hole to cause excessive disturbance of a surrounding soil body, the rotation speed and the lifting speed of the milling wheel are matched with each other, and the soil body and a curing agent can be cut and mixed sufficiently;
cleaning pebbles by using a grab bucket trenching machine, grabbing the pebbles by using a GB46 hydraulic grab bucket trenching machine, cleaning a pebble layer and grabbing the pebble layer to a gravel layer;
backfilling plain soil, namely backfilling the plain soil after the grab bucket grabs the plain soil, filling the wall forming groove with the backfilled plain soil, wherein the compaction coefficient of the backfilled plain soil is determined according to the doping amount of cement;
seventhly, carrying out forward cutting on the TRD, cutting to a designed depth after the TRD equipment is installed in place, and re-cutting the backfilled plain soil;
eighthly, performing TRD return-stroke stirring, namely performing return-stroke stirring after the TRD equipment finishes forward cutting;
step nine, TRD stirring and grouting wall forming, and grouting stirring is carried out after TRD return stroke stirring is finished;
the advancing speed of grouting stirring is determined according to the grouting amount, and when the cement mixing amount is 25%, the volume of a groove section corresponding to the grouting amount in unit time and unit travel time is calculated to determine the advancing speed;
when the cement mixing amount is 25%, calculating the volume of a groove section corresponding to the grouting amount in unit time and unit travel time, and determining the advancing speed; the depth of the underground continuous wall is 15m, the width is 0.8m, the volume weight of the undisturbed soil body is 1950kg/m3The cement mixing amount is 25%, and the calculation formula of the cement dosage per unit length is as follows:
15m*0.8m*1950kg/m3*25％＝5850kg/m
i.e. 5.85t cement per meter needs to be injected
The working efficiency of the background grouting machine is 300kg/min
Calculating the total grouting time t of 19.5min to 5850/300 min
Therefore, the traveling speed should be 19.5min/m or more.
Step ten, inserting H-shaped steel, wherein the H-shaped steel is inserted in 30min after the construction of the underground continuous wall is finished, and the H-shaped steel is inserted by adopting a firm positioning clamp;
step eleven, constructing the crown beam, processing the steel bars according to design requirements, confirming the binding sequence of the steel bars according to a drawing, binding the steel bars in place according to the design of the drawing after positioning and paying off are finished, supporting the crown beam template on the outer side of the steel bars, backfilling and tamping the lower part of plain soil, and paving a plastic film;
and step twelve, recovering the H-shaped steel, wherein the H-shaped steel is pulled out and recovered by a special hydraulic pulling machine, and gaps formed after the H-shaped steel is pulled out are timely backfilled by fine sand and cement grout.
Further, in the embodiment of the present invention, in the first step, the soil layer is divided into three parts, namely a soft soil layer, a pebble layer and a gravel layer, the soft soil layer is cut by using a deep stirring technology of a double-wheel milling machine, the pebble layer is grabbed out by using a grab trenching machine, and the gravel layer is constructed by using the grab trenching machine.
Further, in the third step of the present invention, the width of the trench is 0.8m, the depth is 1m, and the trench is arranged along the wall and can be used as a CSM trench for mixing slurry and replacing water.
Furthermore, in the fourth step of the present invention, the allowable deviation of the plane of the milling wheel is not more than ± 30mm, the deviation of the verticality of the mast is controlled at 1/300, the digging sinking speed is not more than 1.2m/min, the lifting speed is not more than 1.8m/min, excessive disturbance of the surrounding soil body caused by negative pressure generated in the hole during raising is avoided, the rotation speed of the milling wheel is matched with the lifting speed, and the soil body and the curing agent are cut and mixed sufficiently.
Further, in the fourth step of the invention, in the cutting and tunneling construction process of the double-wheel milling machine, the milling head is lifted back and forth to move by lifting the drill rod while injecting high-pressure air, so that the adhesion of clay on the milling head can be avoided.
Further, in the embodiment of the invention, in the fifth step, in the process of cleaning pebbles by the grab bucket trenching machine, the sinking position deviation of the grab bucket is strictly controlled, so that the damage of the grab bucket trenching machine to peripheral soil bodies is avoided, and the bulging phenomenon of subsequent continuous wall trenching is reduced.
Furthermore, in the embodiment of the invention, in the seventh step, the advancing speed is controlled to be 3cm/min to 5cm/min, so that the sufficient cutting of the plain soil is ensured.
Further, in the embodiment of the present invention, in the step eight, the raw soil and the cement-soil slurry are re-mixed by the return stirring, and the return traveling speed is controlled within 8cm/min, so that the raw soil is ensured to be fully contacted with the cement-soil slurry, and the raw soil is ensured to be fully fused with the cement-soil slurry.
Furthermore, in the embodiment of the invention, in the ten steps, in the inserting process of the H-shaped steel, the lower opening of the H-shaped steel is controlled by adopting a positioning card, two theodolites are arranged at the upper part in the X direction and the Y direction, the integral verticality is respectively controlled in the X direction and the Y direction, and the inserting verticality of the H-shaped steel is ensured.
The working principle is as follows: when the CSM + TRD underground continuous wall comprehensive construction method is used, a double-wheel milling deep layer stirring technology (CSM construction technology) is firstly adopted to cut a soil layer, after a large-particle-size pebble layer is cut, a grab bucket grooving machine is adopted to grab out the large-particle-size pebble layer and grab to a designed height, then a TRD technology is adopted to carry out grouting and stirring work on the cement-soil continuous wall, and finally H-shaped steel is inserted to form the underground continuous wall.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A CSM + TRD underground continuous wall comprehensive construction method is characterized in that: the method comprises the following steps:
the method comprises the following steps of firstly, deepening design, namely deepening design of a soil layer construction section according to geological conditions reported by a geological survey;
positioning, measuring and setting out, namely drawing a foundation pit supporting and setting out diagram according to coordinates and elevation control points provided by a surveying and mapping company, determining a central line and inner and outer side lines of the underground continuous wall by a professional measurer, and positioning a construction control line at the outer side of the foundation pit to serve as a control line of the whole foundation pit supporting construction;
step three, excavating a guide groove, namely excavating the guide groove by adopting a PC200 back-shovel excavator;
step four, double-wheel milling cutting, aligning a milling wheel of double-wheel milling mechanical equipment with a side line of the underground continuous wall, determining the position, then continuously enabling a milling head of the double-wheel milling equipment to go deep into the underground, injecting water and high-pressure air while stirring the double wheels, cutting a soil body to form cement-soil slurry of a rectangular groove section, ensuring that the specific gravity of the slurry is not more than 1.3, and stopping the double-wheel milling equipment from cutting until a pebble layer stops;
the plane tolerance deviation of the milling wheel is not more than +/-30 mm, the verticality deviation of the mast is controlled to be 1/300, the digging sinking speed is not more than 1.2m/min, the lifting speed is not more than 1.8m/min, during lifting, negative pressure cannot be generated in a hole to cause excessive disturbance of a surrounding soil body, the rotation speed and the lifting speed of the milling wheel are matched with each other, and the soil body and a curing agent can be cut and mixed sufficiently;
cleaning pebbles by using a grab bucket trenching machine, grabbing the pebbles by using a GB46 hydraulic grab bucket trenching machine, cleaning a pebble layer and grabbing the pebble layer to a gravel layer;
backfilling plain soil, namely backfilling the plain soil after the grab bucket grabs the plain soil, filling the wall forming groove with the backfilled plain soil, wherein the compaction coefficient of the backfilled plain soil is determined according to the doping amount of cement;
seventhly, carrying out forward cutting on the TRD, cutting to a designed depth after the TRD equipment is installed in place, and re-cutting the backfilled plain soil;
eighthly, performing TRD return-stroke stirring, namely performing return-stroke stirring after the TRD equipment finishes forward cutting;
step nine, TRD stirring and grouting wall forming, and grouting stirring is carried out after TRD return stroke stirring is finished;
the advancing speed of grouting stirring is determined according to the grouting amount, and when the cement mixing amount is 25%, the volume of a groove section corresponding to the grouting amount in unit time and unit travel time is calculated to determine the advancing speed;
step ten, inserting H-shaped steel, wherein the H-shaped steel is inserted in 30min after the construction of the underground continuous wall is finished, and the H-shaped steel is inserted by adopting a firm positioning clamp;
step eleven, constructing the crown beam, processing the steel bars according to design requirements, confirming the binding sequence of the steel bars according to a drawing, binding the steel bars in place according to the design of the drawing after positioning and paying off are finished, supporting the crown beam template on the outer side of the steel bars, backfilling and tamping the lower part of plain soil, and paving a plastic film;
and step twelve, recovering the H-shaped steel, wherein the H-shaped steel is pulled out and recovered by a special hydraulic pulling machine, and gaps formed after the H-shaped steel is pulled out are timely backfilled by fine sand and cement grout.
2. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: in the first step, the soil layer is divided into a soft soil layer, a pebble layer and a gravel layer, the soft soil layer is cut by adopting a double-wheel milling deep-layer stirring technology, the pebble layer is grabbed out by adopting a grab grooving machine, and the gravel layer is constructed by adopting the grab grooving machine.
3. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: in the third step, the width of the guide groove excavation is 0.8m, the depth is 1m, and the guide groove excavation is arranged along the wall body.
4. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: in the fourth step, the allowable deviation of the milling wheel plane is not more than +/-30 mm, the verticality deviation of the mast is controlled at 1/300, the digging sinking speed is not more than 1.2m/min, and the lifting speed is not more than 1.8 m/min.
5. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: in the fourth step, the double-wheel milling machine lifts the drill rod moving milling head back and forth while injecting high-pressure air in the cutting and tunneling construction process.
6. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: and step five, strictly controlling the sinking position deviation of the grab bucket in the pebble cleaning process of the grab bucket trenching machine.
7. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: in the seventh step, the advancing speed is controlled to be 3 cm/min-5 cm/min.
8. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: and step eight, mixing the plain soil and the cement soil slurry again through return stirring, wherein the return traveling speed is controlled within 8 cm/min.
9. The CSM + TRD underground continuous wall comprehensive construction method according to claim 1, characterized in that: and ten steps, in the inserting process of the H-shaped steel, the lower opening of the H-shaped steel is controlled by a positioning card, and two theodolites are arranged at the upper part in the X direction and the Y direction.
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