CN111749229A - Construction method of ultra-deep equal-thickness cement soil wall capable of falling into rock - Google Patents
Construction method of ultra-deep equal-thickness cement soil wall capable of falling into rock Download PDFInfo
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- CN111749229A CN111749229A CN202010645148.6A CN202010645148A CN111749229A CN 111749229 A CN111749229 A CN 111749229A CN 202010645148 A CN202010645148 A CN 202010645148A CN 111749229 A CN111749229 A CN 111749229A
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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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
Abstract
The invention provides a construction method of an ultra-deep equal-thickness cement soil wall capable of falling into rock, which comprises the following steps of measuring and setting out; excavating a working groove of the cement soil wall; determining the position, diameter, depth and spacing of the lead holes; guiding holes by using a reverse circulation drilling pile machine, discharging coarse pebble ballast in an original stratum and drill ballast crushed by a reverse circulation drill bit out of a drilled hole by using a mud reverse circulation system, and settling fine-grained soil into the holes by using the mud reverse circulation system; and finally, finishing the construction of the straight cement-soil wall by wall forming by a TRD construction method. The invention can effectively improve the original stratum, reduce the transverse and longitudinal cutting resistance during the construction of the TRD construction machine, effectively solve the problems of large abrasion, large cutting resistance, low cutting efficiency and high mechanical failure rate of the cutter row of the traditional TRD construction machine in a pebble layer in the complex stratum such as an ultra-deep stratum, a pebble layer, a rock stratum and the like, and simultaneously ensure that the cement soil wall after stirring is more uniform and stable. The invention has reasonable design, safe, simple and efficient construction, low cost and is suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of deep foundation pit engineering, and particularly relates to a construction method of an ultra-deep equal-thickness cement soil wall capable of falling into rock.
Background
In recent years, a TRD method has been used in the foundation reinforcement and the anti-seepage treatment of construction works, underground works, bank protection works, dams, and embankments. The TRD construction Method (Trench-Cutting & Re-mixing Deep Wall Method) is also called as an equal-thickness cement soil underground continuous Wall construction Method, a chain saw type cutter box is vertically inserted into the ground and then horizontally moves, meanwhile, a chain drives a cutter to do up-and-down rotary motion, original soil is stirred and mixed, and cement slurry is poured into the mixed soil to form a Wall with a certain thickness.
Along with the continuous development of deep foundation pit engineering technology, super large ultra-deep foundation pits emerge continuously, higher requirements are also put forward to traditional waterproof curtains, for example, near high buildings, near deep foundation pits, near subways and other foundation pits with extremely high requirements on deformation and leakage, the uniformity and the impermeability of the waterproof curtains play more and more important roles in the protection of the surrounding environment and the safety of the foundation pits, and the construction problem of ultra-deep and even falling-bottom equal-thickness cement soil walls is solved. The traditional TRD construction method machine cannot easily cope with various complex strata, and the conditions of large cutter abrasion and large deformation often occur in a pebble stratum or an engineering case requiring bottom falling into rock, so that the cutting efficiency is low, shear bolts of a cutting box are frequently damaged, and even engineering quality accidents such as drill jamming, box burying and the like occur.
At present, in order to solve the problems, in the prior art, a combination of a double-wheel milling machine and a grooving machine is adopted for construction, namely, cutting and cleaning of a soil layer are carried out through the double-wheel milling machine and the grooving machine, plain soil is backfilled, and finally TRD (blast furnace direct grouting) continuous wall construction is carried out. The method can relieve the pressure of TRD construction to a certain extent. However, the above method has a great problem: first, the process is cumbersome. Before the construction of a trenching machine, firstly, a guide wall needs to be manufactured to provide trenching guide and the load of trenching machinery, after trenching, in order to prevent the collapse of the trench wall, the trench wall needs to be reinforced by reinforcing equipment such as a double-shaft or three-shaft drilling machine, and special slurry for a wall protection process of the trenching machine needs to be prepared; in addition, when plain soil is backfilled, earthwork needs to be purchased, and a digging machine is needed to be matched with the fill, so that the process is complicated. Second, the wall quality is affected. When the grooving machine cleared up the soil layer, can in fact be with whole the digging out of rubble and soil layer, after the grooving machine approach hole, the inslot was covered with mud, breaks original soil layer structure, and its essence is for changing to fill out entirely, when putting into the earthwork in mud, can't backfill closely knit, can lead to later stage TRD to become the wall inhomogeneous to influence stagnant water effect, and then influence the construction quality of cement soil wall. Thirdly, the construction efficiency is low. The method has complex process, takes 65 m wall depth as an example: one every two days (6 linear meters on the plane), three meters every day; after the TRD is improved in soil quality, construction can be carried out for 8 meters every day, and the hole guiding efficiency cannot meet the requirements of a TRD working face, so that the construction efficiency is low. Fourth, the cost is high. The trenching machines and other processes employ expensive equipment, resulting in increased overall construction costs. Based on the above, the invention provides a simple and efficient equal-thickness cement-soil wall construction method capable of forming walls uniformly in ultra-deep complex strata such as pebble-containing strata and rock strata, and the like, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a construction method of an ultra-deep equal-thickness cement-soil wall capable of falling into rock aiming at the defects of the prior art, solves the problems of large cutting resistance, low efficiency, high mechanical failure rate and high quality accident rate of a traditional TRD construction machine in complex strata such as ultra-deep stratum, pebble-containing stratum, rock stratum and the like, and effectively improves the stratum condition and the wall forming uniformity by using a slurry reverse circulation system.
The invention adopts the following technical scheme:
a construction method of an ultra-deep equal-thickness cement-soil wall capable of falling into rock comprises the steps of drilling a hole in the center line of the cement-soil wall through a reverse circulation drilling machine before construction of a TRD construction machine, discharging coarse pebble ballast in an original stratum and drill ballast crushed by a reverse circulation drill bit out of the drilled hole through a mud reverse circulation system, and simultaneously depositing fine-grain-size soil into the hole through the mud reverse circulation system so as to reduce transverse and longitudinal cutting resistance during construction of the TRD construction machine.
Further, the method comprises the following steps:
s1, measurement and setting: calculating the coordinates of the corner points of the center line of the cement soil wall, lofting by using a measuring instrument, rechecking coordinate data, and meanwhile, preparing pile protectors;
s2, reinforcing the construction site and excavating a cement soil wall working groove: after the center of the cement soil wall is lofted, laying steel plates on a construction site for reinforcement, ensuring that the construction site meets the requirement of mechanical equipment on the bearing capacity of a foundation and ensuring the stability of a pile machine; excavating a working groove along the direction parallel to the center line of the cement-soil wall by using an excavator;
s3, determining the drilling pile position of the reverse circulation drilling machine: determining the drilling pile positions of the reverse circulation drilling machines according to the center line of the cement-soil wall, wherein the center connection line of the drilling pile positions of each reverse circulation drilling machine is consistent with the center line of the cement-soil wall;
s4, drilling: arranging a mud reverse circulation system, wherein the system comprises a reverse circulation mud pool, a mud groove and a reverse circulation drilling machine; drilling holes through a reverse circulation drilling machine according to the position of the pile hole determined in the S3, discharging broken rocks to a reverse circulation mud pit along with a reverse circulation system, transporting the broken rocks outwards after deposition, and depositing fine-grain soil into the drilled holes through mud grooves in a circulating mode to form a uniform and loose stratum;
s5, wall forming by a TRD construction method: constructing a cement soil wall by adopting a TRD construction method machine at the drilling completion section;
s6, pulling out the cutting box: after the cement soil wall construction is finished, the cutting box is pulled out while the curing liquid with the same proportion is injected into the pulling-out area of the cutting box, the fact that the cutting box occupies a cavity is guaranteed to be compactly filled and effectively reinforced, and the construction of a straightway wall body is finished.
Further, in S2, the width of the active trench is 1.0m, and the depth of the trench is 1.0 m.
Further, in S4, the diameter of the drilled hole is consistent with the wall thickness of the cement soil wall, and the designed depth of the drilled hole is consistent with the designed depth of the cement soil wall.
Further, in S4, the interval between the respective bores is 1.5 to 3 times the wall thickness.
Further, in S4, the mud trench is shared with the cemented earth working trench.
Further, in S4, fine-grained soil is circularly precipitated into the drill hole from the mud groove to form a uniform stratum with a loose coefficient of 1.2-1.3.
The invention has the beneficial effects that:
according to the invention, by arranging the slurry reverse circulation system, before the construction of the TRD working machine, the reverse circulation drilling machine is used for drilling at the central line position of the cement soil wall, the thick pebble ballast and the crushed drilling ballast in the original stratum are discharged out of the drilled hole by using the slurry reverse circulation system, meanwhile, the slurry reverse circulation system is used for depositing fine-grained soil into the hole, the original soil layer structure is not broken, the natural deposition is uniform and compact, the effect of effectively improving the original stratum is achieved, and the transverse cutting resistance during the construction of the TRD working machine and the longitudinal resistance of the bedrock during the sinking of the TRD cutting box are greatly reduced; the invention effectively solves the problems of large abrasion, large cutting resistance, low cutting efficiency, high mechanical failure rate and high quality accident rate of the cutter row of the traditional TRD construction method in the pebble layer in the ultra-deep complex strata containing the pebble layer, the rock stratum and the like, and simultaneously ensures that the cement soil wall after stirring is more uniform and stable and has better water stopping effect. The invention has the advantages of reasonable design, safe construction, simple and efficient process, low construction cost and suitability for popularization.
Description of the drawings:
FIG. 1 is a schematic view of a slurry reverse circulation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a reverse circulation drilling construction sequence according to an embodiment of the present invention;
the reference numbers in the drawings are: 1. a reverse circulation mud pit; 2. a slurry groove; 3. a reverse circulation drilling machine; 4. the drilling is completed; 5. drilling in construction; 6. coarse crushing and drilling of pebbles; A. reverse circulation drilling construction sequence; B. and (5) reverse circulation drilling construction direction.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a construction method of an ultra-deep equal-thickness cement soil wall capable of falling into rock, which comprises the steps of drilling a hole at the center line position of the cement soil wall through a reverse circulation drilling machine before the construction of a TRD construction machine, discharging pebble coarse slag in an original stratum and drill slag crushed by a reverse circulation drill bit out of the drilled hole through a mud reverse circulation system, and simultaneously depositing fine-grain-size soil into the hole through the mud reverse circulation system so as to reduce the transverse and longitudinal cutting resistance during the construction of the TRD construction machine.
Specifically, the method comprises the following steps:
s1, measurement and setting: accurately calculating the coordinates of the corner points of the center line of the cement soil wall, lofting by using a measuring instrument, rechecking coordinate data, and meanwhile, manufacturing a pile protector;
s2, reinforcing the construction site and excavating a cement soil wall working groove: according to the weight of the TRD construction method equipment, after the center of the cement soil wall is lofted, a steel plate is laid on a construction site for reinforcement, the construction site is ensured to meet the requirement of mechanical equipment on the bearing capacity of a foundation, and the stability of the pile machine is ensured; excavating a working groove along the direction parallel to the center line of the cement-soil wall by using an excavator; the width of the working groove is 1.0m, the depth of the groove is 1.0m, and the upper layer of miscellaneous fill is cleaned.
S3, determining the drilling pile position of the reverse circulation drilling machine: determining the drilling pile positions of the reverse circulation drilling machines according to the center line of the cement-soil wall, wherein the center connection line of the drilling pile positions of each reverse circulation drilling machine is consistent with the center line of the cement-soil wall;
s4, drilling: setting a mud reverse circulation system, and referring to fig. 1, wherein the system comprises a reverse circulation mud pit, a mud groove and a reverse circulation drilling machine; according to the position of the pile hole determined in the S3, drilling is carried out through a reverse circulation drilling machine, pebbles and broken rocks are discharged to a reverse circulation mud pit along with a reverse circulation system, the pebbles and the broken rocks are transported outside after deposition, fine-grained soil is deposited into the drilled hole through a mud groove in a circulating mode, the purpose of natural deposition is achieved, a uniform stratum with a bulk coefficient of 1.2-1.3 is formed, the deposited soil is uniform and loose, the transverse cutting resistance in the subsequent construction of a TRD construction method machine can be greatly reduced, and the vertical resistance of bedrock when a TRD cutting box sinks is also greatly reduced; the diameter of the drilled hole is consistent with the wall thickness of the cement soil wall, and the designed depth of the drilled hole is consistent with the designed depth of the cement soil wall; the distance between every two drill holes is controlled to be 1.5 to 3 times of the wall thickness according to the self-stability condition of the stratum; the mud groove and the cement soil wall working groove are shared; the construction direction of the reverse circulation drilling hole is consistent with the construction direction of the TRD cement soil wall, and specifically, the construction sequence of the reverse circulation drilling hole refers to fig. 2.
S5, wall forming by a TRD construction method: constructing a cement soil wall by adopting a TRD construction method machine at the drilling completion section; specifically, an excavator is used for excavating an embedded hole with the depth of about 3m, the length of about 2m and the width of about 1m, and a crane is used for hoisting the embedded box into the embedded hole; the cutting box is connected with the host; injecting an excavating liquid into the bottom of the cutting box to cut the soil layer for a certain distance in advance, then withdrawing and excavating to the original position, and beginning to inject a curing liquid to forcibly mix and stir the curing liquid with the in-situ soil body to form the equal-thickness cement soil underground continuous wall.
S6, pulling out the cutting box: after the cement soil wall construction is finished, the cutting box is pulled out while the curing liquid with the same proportion is injected into the pulling-out area of the cutting box, the fact that the cutting box occupies a cavity is guaranteed to be compactly filled and effectively reinforced, and the construction of a straightway wall body is finished.
Before the construction of the TRD construction machine, the invention firstly drills holes at the central line position of the cement soil wall by a reverse circulation drilling machine, discharges coarse pebble dregs and crushed drilling dregs in the original stratum out of the drilled holes by using a slurry reverse circulation system, and simultaneously deposits fine-grain-diameter soil into the holes by using the slurry reverse circulation system to naturally deposit, thereby achieving the effect of effectively improving the original stratum, greatly reducing the transverse cutting resistance during the construction of the TRD construction machine and the longitudinal resistance of a bed rock during the sinking of a TRD cutting box, effectively solving the problems of large abrasion, large cutting resistance, low cutting efficiency, high mechanical failure rate and high quality accident rate of the cutter rows in the ultra-deep stratum containing a pebble layer, rock stratum and other complex stratums, and simultaneously ensuring that the stirred cement soil wall is more uniform, more stable and better in water stop effect.
Compared with the prior art, the slurry reverse circulation system and the TRD construction method are combined, the process is simple, the guide wall structure and the reinforcement of the groove wall are not needed, the cost of the reverse circulation drilling machine applied in the scheme is only one tenth of that of grooving machine equipment, the construction process is greatly simplified, the construction cost is reduced, the construction efficiency is improved, and 6 holes 1.8 meters =10.4 (plane extension meter) can be constructed every day. More importantly, the scheme adopts the slurry reverse circulation system to naturally precipitate fine-grained soil into the hole, earthwork does not need to be purchased, the original soil layer structure is not damaged, the natural precipitation is uniform and compact, the loosening coefficient can reach 1.25 after rocks and pebbles are removed, the wall body is uniform after the wall is formed, the integrity is good, and the water stop effect is good. The invention essentially solves the defects of low efficiency, abrasion and high accident rate (the cutting box is buried) caused by the difficulty of adapting to complex stratums such as pebble stratums, rock stratums and the like by a single TRD construction method, and breaks the regional limitation of the process. And the problems that the wall forming quality of a single TRD device is not uniform (the wall forming is easy to layer) under the condition of a complex stratum, and the strength of a cement-soil wall formed by the same cement mixing ratio is different due to different stratums are solved. The improved mud reverse circulation system has uniform stratum, and can determine the optimal cement mixing ratio through experiments to ensure the wall forming quality.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention, it should be noted that, for those skilled in the art, several modifications and decorations without departing from the principle of the present invention should be regarded as the protection scope of the present invention.
Claims (7)
1. A construction method of an ultra-deep equal-thickness cement soil wall capable of falling into a rock is characterized in that before construction of a TRD construction method machine, a reverse circulation drilling machine is used for drilling a hole in the center line position of the cement soil wall, thick pebble ballast in an original stratum and drill ballast crushed by a reverse circulation drill bit are discharged out of the drilled hole through a slurry reverse circulation system, meanwhile, fine-grain-size soil is deposited into the hole through the slurry reverse circulation system, and therefore transverse and longitudinal cutting resistance during subsequent construction of the TRD construction method machine is reduced.
2. A method of constructing an ultra-deep and rock-allowed equal thickness concrete earth wall according to claim 1, comprising the steps of:
s1, measurement and setting: calculating the coordinates of the corner points of the center line of the cement soil wall, lofting by using a measuring instrument, rechecking coordinate data, and meanwhile, preparing pile protectors;
s2, reinforcing the construction site and excavating a cement soil wall working groove: after the center of the cement soil wall is lofted, laying steel plates on a construction site for reinforcement, ensuring that the construction site meets the requirement of mechanical equipment on the bearing capacity of a foundation and ensuring the stability of a pile machine; excavating a working groove along the direction parallel to the center line of the cement-soil wall by using an excavator;
s3, determining the drilling pile position of the reverse circulation drilling machine: determining the drilling pile positions of the reverse circulation drilling machines according to the center line of the cement-soil wall, wherein the center connection line of the drilling pile positions of each reverse circulation drilling machine is consistent with the center line of the cement-soil wall;
s4, drilling: arranging a mud reverse circulation system, wherein the system comprises a reverse circulation mud pool, a mud groove and a reverse circulation drilling machine; drilling holes through a reverse circulation drilling machine according to the position of the pile hole determined in the step S3, discharging broken rocks and pebbles to a reverse circulation mud pit along with a reverse circulation system, transporting the broken rocks and pebbles out after sedimentation, and circularly settling fine-grained soil into the drilled holes through mud grooves to form a uniform and loose stratum;
s5, wall forming by a TRD construction method: constructing a cement soil wall by adopting a TRD construction method machine at the drilling completion section;
s6, pulling out the cutting box: after the cement soil wall construction is finished, the solidifying liquid is injected into the pulling area of the cutting box while pulling, the fact that the cutting box occupies a cavity is guaranteed, the cavity is compactly filled and effectively reinforced, and the straight-line-segment wall construction is finished.
3. A method of constructing an ultra-deep and rock-submersible constant-thickness concrete earth wall as recited in claim 2, wherein in S2, the working groove width is 1.0m and the groove depth is 1.0 m.
4. The method of constructing an ultra-deep equal-thickness cement-soil wall capable of falling into a rock as claimed in claim 2, wherein in S4, the diameter of the drilled hole is identical to the thickness of the cement-soil wall, and the designed depth of the drilled hole is identical to the designed depth of the cement-soil wall.
5. A method of constructing an ultra-deep and rock-allowed equal thickness soil cement wall according to claim 2, wherein the interval between the respective drilled holes is 1.5 to 3 times the wall thickness in S4.
6. The method of constructing an ultra-deep and rock-capable equal thickness cement soil wall according to claim 2, wherein the mud trench is shared with the cement soil wall working trench at S4.
7. The method of constructing an ultra-deep and rock-submersible constant-thickness cement soil wall as recited in claim 2, wherein in S4, fine-grained soil is circularly deposited into the borehole from the mud trench, forming a uniform formation with a loosening coefficient of 1.2-1.3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115354649A (en) * | 2022-08-26 | 2022-11-18 | 中建五局华东建设有限公司 | TRD construction method for pebble bed ultra-deep falling-bottom rock |
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Application publication date: 20201009 |