CN112942310A - Construction process of equal-thickness cement-soil stirring continuous wall - Google Patents
Construction process of equal-thickness cement-soil stirring continuous wall Download PDFInfo
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- CN112942310A CN112942310A CN202110104509.0A CN202110104509A CN112942310A CN 112942310 A CN112942310 A CN 112942310A CN 202110104509 A CN202110104509 A CN 202110104509A CN 112942310 A CN112942310 A CN 112942310A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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Abstract
The application relates to the field of underground continuous engineering, in particular to a construction process of an equal-thickness cement-soil stirring continuous wall, which comprises the following steps: exploring geological conditions and exploring the soil property characteristics in the depth range; carrying out double-wheel milling deep-stirring cutting construction, and cleaning broken stones in the grooving of the underground diaphragm wall; the cutting box is driven into the ground for digging; filling light aggregate in the grooving of the underground diaphragm wall; constructing a cement-soil mixing wall; the cutting box is pulled out and decomposed. The construction problem of when thickness cement soil stirring continuous wall is thicker, the higher closely knit stereoplasm stratum of intensity in the stratum has been solved to this application, has improved underground continuous wall's efficiency of construction and quality, has reduced the waste of material.
Description
Technical Field
The application relates to the field of underground continuous engineering, in particular to a construction process of an equal-thickness cement-soil stirring continuous wall.
Background
The continuous wall is constructed by forming a groove section by using drilling equipment, has high structural rigidity, can well play a supporting role, is suitable for various geological conditions, and can be used as a part of an underground building main body.
The equal-thickness cement-soil mixed continuous wall is different from a column type cement-soil mixed continuous wall formed by a traditional single-shaft or multi-shaft spiral drilling machine in construction method. The equal-thickness cement-soil stirring continuous wall is constructed by firstly inserting a chain saw type cutting tool into a foundation, excavating to the designed depth of a wall body, then injecting a curing agent, mixing with an in-situ soil body, continuously and transversely excavating, stirring and horizontally propelling. The equal-thickness cement-soil mixing continuous wall is formed by driving a chain saw type cutting box through a power box hydraulic motor, connecting and drilling to a preset depth in a segmented mode, excavating and propelling horizontally and transversely, injecting curing liquid into the bottom of the cutting box, enabling the curing liquid to be mixed and stirred with an in-situ soil body forcibly, and adding section steel to increase the rigidity and strength of the mixing wall.
The method changes the stirring mode of the cement-soil stirring wall from the traditional horizontal layered stirring mode of a vertical shaft spiral drill rod into the horizontal shaft saw chain type cutting box which is vertically and integrally stirred along the depth of the wall. However, due to the limited cutting ability of the equal-thickness cement-soil stirring continuous wall construction equipment, in a dense hard stratum with a thick stratum and high strength, the equipment is difficult to cut, the construction progress is slow, and even the construction cannot be carried out.
Disclosure of Invention
In order to solve the construction problem of the equal-thickness cement-soil mixing continuous wall in a thick stratum and a high-strength compact hard stratum, the application provides a construction process of the equal-thickness cement-soil mixing continuous wall.
The application provides a construction process of equal-thickness cement-soil stirring continuous wall, which adopts the following technical scheme:
a construction process of an equal-thickness cement-soil stirring continuous wall comprises the following steps:
s1, exploring geological conditions and exploring the soil property characteristics in the depth range;
s2, carrying out double-wheel milling deep stirring cutting construction, and cleaning broken stones in the grooves of the underground continuous wall;
s3, driving the cutting box into the excavator by itself;
s4, filling lightweight aggregate in the forming groove of the underground continuous wall;
s5, constructing a cement-soil mixing wall;
and S6, pulling out and decomposing the cutting box.
By adopting the technical scheme, when the diaphragm wall is constructed in the environment of the compact hard stratum with a thicker stratum and higher strength, the compact hard stratum is firstly cut by the cutting equipment to damage the stratum structure, so that the stratum becomes soft, and the construction difficulty of the later equipment is reduced; after the broken stones in the grooving of the underground continuous wall are cleaned, the construction stratum is softer, and the cutting construction difficulty of the cutting box is reduced; and the light aggregate is filled in the underground continuous wall forming groove, so that the stratum structure can be supplemented, the water absorption of the constructed underground continuous wall is better, the wall body fluidity is low, the constructed underground continuous wall is more stable, and the construction quality is better.
Optionally, in S2, when the crushed stone is cleaned, the crushed stone with a particle size of more than 10cm is cleaned, and the crushed stone with a particle size of less than 10cm is backfilled in the groove of the underground continuous wall.
By adopting the technical scheme, the crushed stones with the granularity of more than 10cm are cleaned, so that the cutting difficulty and the cutting resistance of the cutter of the cutting box can be reduced, and the small-granularity crushed stones are not easy to influence the vertical movement of the cutter; the broken stones and the sandy soil with the granularity of less than 10cm are reserved, the small-granularity sandy stones are more easily hidden in the continuous wall and are more fully combined with cement and soil, the mixing and stirring uniformity of the continuous wall is improved, and meanwhile, the using amount of backfill materials in the groove of the underground continuous wall is reduced, so that the materials are more saved in engineering construction.
Optionally, the S3 includes the following steps:
A. measuring and paying off, and performing center line lofting on the diaphragm wall in the diaphragm wall grooving;
B. paving steel plate reinforcement treatment measures on the construction site to ensure that the construction site meets the requirement of mechanical equipment on the bearing capacity of the foundation, and excavating working grooves in the direction parallel to the central line of the continuous wall by using excavating equipment;
C. hoisting the pre-buried box, excavating a pre-buried hole by using excavating equipment, and hoisting the pre-buried box into the pre-buried hole by using a crane;
d, the trd device is in place;
E. hanging the cutting boxes section by section into the pre-buried holes and supporting and fixing; the TRD equipment host computer moves to pre-buried acupuncture point and puts the connection cutting case, and the host computer returns predetermined construction position again and carries out the cutting case and squeeze into the excavation process by oneself.
By adopting the technical scheme, the cutting box is automatically driven into the excavation stage to firstly carry out measurement and pay-off so as to ensure that the construction direction of the continuous wall is correct and the construction error is reduced; the steel plates are paved on the construction site for reinforcement, so that the placement requirement of equipment can be met, and the condition that stratum is pressed and collapsed around the continuous wall grooving is reduced; working grooves are excavated around the center line of the continuous wall, so that the equipment is convenient to install and fix; after the TRD equipment is in place, the multi-section cutting box is connected, and then the cutting box is connected with the TRD equipment host, so that the position deviation of the TRD equipment can not be caused, the construction direction of the continuous wall can meet the design requirement, and the deviation error of the direction can be reduced.
Optionally, the step S3 further includes installing an inclinometer, installing the inclinometer after the cutting box is driven into the designed depth by itself, and installing the multi-section inclinometer inside the cutting box to manage the vertical accuracy of the wall and ensure the accuracy within 0.01.
By adopting the technical scheme, the inclinometer is arranged on the cutting box to measure the cutting-in verticality of the cutting box, and the cutting-in direction of the cutting box is adjusted according to measured data, so that the verticality and the construction quality of the continuous wall are guaranteed.
Optionally, when the underground continuous wall grooving step in S4 is filled with the lightweight aggregate, the lightweight aggregate includes one or more of pumice, ceramsite, shale or expanded perlite, and the surface layer of the lightweight aggregate is backfilled with a layer of surface soil.
By adopting the technical scheme, a layer of surface soil is paved on the lightweight aggregate, and the excavated original soil is recycled, so that the use of raw materials such as the lightweight aggregate can be reduced, and the original stratum foundation can be used more.
Optionally, the S5 includes the following steps:
F. firstly, excavating, namely injecting excavating fluid at the bottom of the cutting box to cut a soil layer for a certain distance in advance;
G. withdrawing and excavating, namely withdrawing and excavating the cutting box to the starting point of the prior excavation;
H. and (4) injecting a curing liquid into the cutting box to forcibly mix and stir the curing liquid and the in-situ soil body to form the equal-thickness cement soil underground continuous wall.
Through adopting above-mentioned technical scheme, advance in the excavation process and withdraw again, can more fully smash former stratum structure, make the material distribution in the diaphragm wall more even, let in the curing liquid to the cutting box again, make the quality of finished wall better.
Optionally, the step S5 further includes retreating excavation, after the cutting box forcibly mixes and stirs the solidification liquid and the in-situ soil body, continuing excavation forward, avoiding the solidified underground continuous wall during excavation, and repeating the step F-H.
By adopting the technical scheme, the step of retreating and excavating is added, the solidified wall body can be better avoided, the damage to the wall body structure is reduced, the structural strength of the continuous wall body is higher, the continuous wall is constructed in a segmented mode, and the construction direction and the perpendicularity of the wall body are more controllable.
Optionally, a slurry fluidity test is performed after the step S5, a slurry sample is taken from the upper layer of the diaphragm wall, the fluidity test is performed, and the water amount in the excavation fluid is adjusted according to the fluidity test result.
Through adopting above-mentioned technical scheme, through taking a sample to the thick liquid on wall body upper strata to measure the mobility, can learn the liquid content in the wall body, can control the addition of the liquid in the wall body raw materials, make the diaphragm wall can not the liquid content too high and appear collapsing, also can not be because the liquid content is too low and can not solidify completely.
Optionally, after the step S5, surface mud cleaning is performed, and the surface mud is pumped out and accumulated by a sewage pump at one end of the continuous wall for uniform treatment.
Through adopting above-mentioned technical scheme, the surface mud is in time cleared up, can avoid the excessive thick liquid of infiltration in the diaphragm wall and cause the condition that the wall body flows or collapses to appear, also can provide a relatively dry construction environment for whole work progress, alleviates the construction pressure of engineering when rainy season.
Optionally, in the step S6, after the construction of the continuous wall on the first working face is finished, the TRD device host is used to pull out the cutting box in sections and disassemble the cutting box, the whole device is moved to the other working face for assembly, the construction is continued, and after the construction is finished, the device is moved back.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the process is used for constructing the continuous wall in the environment of the compact hard stratum with a thicker stratum and higher strength, the compact hard stratum is firstly cut by the cutting equipment to destroy the stratum structure, so that the stratum becomes soft, and the construction difficulty of later equipment is reduced; after the broken stones in the grooving of the underground continuous wall are cleaned, the construction stratum is softer, and the cutting construction difficulty of the cutting box is reduced; and the light aggregate is filled in the underground continuous wall forming groove, so that the stratum structure can be supplemented, the water absorption of the constructed underground continuous wall is better, the wall body fluidity is low, the constructed underground continuous wall is more stable, and the construction quality is better.
2. The cement-soil mixing wall construction stage of the process increases the step of retreating excavation, can better avoid the cured wall body, reduces the damage to the wall body structure, has higher structural strength of the continuous wall body, carries out construction on the continuous wall in a segmented mode, and is more controllable in construction direction and perpendicularity of the wall body.
3. After the stirring of diaphragm wall is accomplished, in time clear up the top layer mud as early as possible, can avoid the excessive thick liquid of infiltration in the diaphragm wall and cause the condition that the wall body flows or collapses to appear, also can provide a relatively dry construction environment for whole work progress, alleviate the construction pressure of engineering when rainy season, can accelerate the solidification speed of diaphragm wall more.
Drawings
FIG. 1 is a flow chart of the process of the embodiment of the present application.
Fig. 2 is a process flow diagram of the self-driving excavation stage of the cutting box according to the embodiment of the present application.
FIG. 3 is a process flow diagram of the construction phase of the cement-soil mixing wall according to the embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a construction process of an equal-thickness cement-soil stirring continuous wall. Referring to fig. 1, the construction process includes the following steps;
s1, exploring geological conditions and exploring the soil property characteristics in the depth range;
when geological conditions are detected, the depth of a rock stratum is detected, a construction scheme is designed according to the detected result, and an excavation scheme is determined according to the soil property characteristics.
S2, carrying out double-wheel milling deep stirring cutting construction, and cleaning broken stones in the grooves of the underground continuous wall;
selecting double-wheel milling deep-stirring equipment with strong cutting performance for cutting, digging a soil layer before cutting, placing and stacking the soil layer on two sides of the continuous wall, cutting a gravel layer below the soil layer, and controlling the speed in the cutting process; when the broken stones are cleaned, the broken stones with the granularity of more than 10cm are cleaned, the cutting difficulty and the cutting resistance of a cutter of the cutting box can be reduced, the broken stones with the granularity of less than 10cm are backfilled in the groove of the underground continuous wall, small-granularity sand and stones are more easily hidden in the continuous wall and are more fully combined with cement and soil, the mixing and stirring uniformity of the continuous wall is improved, and meanwhile, the using amount of backfilling materials in the groove of the underground continuous wall is reduced.
S3, driving the cutting box into the excavator by itself;
with reference to fig. 1 and 2, the specific self-driving excavation phase of the cutting box comprises the following steps:
A. measuring and paying off, and performing center line lofting on the diaphragm wall in the underground diaphragm wall grooving to ensure that the construction direction of the diaphragm wall is correct and the construction error is reduced; firstly, accurately calculating the coordinates of the corner points of the center line of the enclosure wall according to a design drawing and coordinate reference points provided by an owner, lofting by using a measuring instrument, rechecking coordinate data, and simultaneously preparing a fender pile;
B. according to the weight of TRD equipment, after the center line of the continuous wall is lofted, steel plates are laid on a construction site for reinforcement, the construction site is guaranteed to meet the requirement of mechanical equipment on the bearing capacity of a foundation, a working groove is excavated by excavating equipment along the parallel direction of the center line of the continuous wall, the groove width is about 1.2m, and the groove depth is about 1.0 m.
C. Hoisting the pre-buried box, excavating a pre-buried hole with the depth of about 3m, the length of about 2m and the width of about 1m by using an excavator, and hoisting the pre-buried box into the pre-buried hole by using a crane;
d, conveying TRD equipment to a construction site to be in place, wherein the TRD equipment in the embodiment adopts a TRD-D type construction machine, uniformly commanding the pile machine to be in place, clearly seeing the conditions of the upper, lower, left and right aspects before moving, timely removing the obstacles when finding out the obstacles, checking the positioning condition and timely correcting after moving, and stabilizing the TRD equipment;
E. the cutting boxes are hoisted section by section into the pre-buried holes by a crawler crane, and a support table is built to support and stably build the cutting boxes; the TRD equipment main machine moves to the pre-buried acupuncture point position to be connected with the cutting box, and the main machine returns to the preset construction position to carry out the self-driving of the cutting box into the excavation process.
After the cutting box is installed, the inclinometer is continuously installed, the inclinometer is installed after the cutting box is driven into the designed depth by itself, the inclinometer can be installed again, the inclinometer can adopt a multi-section inclinometer, one section is kept at every two meters according to the depth of the wall body, each section is installed, the vertical precision management of the wall body is carried out, the cutting direction of the cutting box is adjusted if the inclination of the wall body is larger within 0.01, and therefore the perpendicularity and the construction quality of the continuous wall are guaranteed.
S4, filling light aggregate in the underground continuous wall forming groove, wherein the light aggregate is one or more of pumice, ceramsite, shale or expanded perlite, the light aggregate needs to be stirred uniformly before filling, after the light aggregate is filled, a layer of excavated surface soil is backfilled on the surface layer of the light aggregate, and the thickness of the light aggregate layer is kept the same as that of the surface soil layer.
S5, constructing the cement-soil mixing wall, which comprises the following steps:
F. firstly, excavating, namely, injecting excavating fluid at the bottom of a cutting box to pre-cut a soil layer for a certain distance, namely excavating for a certain length;
G. the cutting box is retracted and excavated to the starting point of the prior excavation, so that the original stratum structure is more fully broken, and the broken stone, the light aggregate and the surface soil in the continuous wall grooving are more uniformly distributed;
H. injecting curing liquid into the cutting box to forcibly mix and stir the curing liquid and the materials in the continuous wall forming groove to form the equal-thickness cement-soil underground continuous wall;
I. after a section of construction is finished, retreating and excavating are carried out, the cutting box carries out forced mixing and stirring on the curing liquid and the materials in the finished groove, then, excavating is continued forwards, the cured underground continuous wall is avoided during excavating, the cured underground continuous wall is prevented from being damaged, and then, the F-H steps are repeated for continuing construction;
J. during the continuous construction process, slurry fluidity testing is required, slurry samples are taken from the upper layer of the continuous wall, the fluidity testing is carried out, the water quantity in the excavating fluid is adjusted according to the fluidity testing result, if the fluidity is too high, the water content in the additive is reduced, and if the fluidity is too low, the water content is increased;
K. meanwhile, surface mud cleaning is needed, the surface mud is pumped out of the field through a sewage pump at one end of the diaphragm wall and is accumulated in a soil collecting pit for storage, unified treatment is carried out, a relatively dry construction environment is provided for the whole construction process, and the construction pressure of the engineering in rainy seasons is relieved.
And S6, finally, pulling out and decomposing the cutting box, after the construction of the continuous wall of one section of the working face is finished, pulling out the cutting box in sections by using the TRD equipment host machine and decomposing the cutting box, integrally moving the equipment to the other section of the working face for assembly, continuing the construction, and after the construction is finished, withdrawing the equipment.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The construction process of the equal-thickness cement-soil stirring continuous wall is characterized by comprising the following steps of:
s1, exploring geological conditions and exploring the soil property characteristics in the depth range;
s2, carrying out double-wheel milling deep stirring cutting construction, and cleaning broken stones in the grooves of the underground continuous wall;
s3, driving the cutting box into the excavator by itself;
s4, filling lightweight aggregate in the forming groove of the underground continuous wall;
s5, constructing a cement-soil mixing wall;
and S6, pulling out and decomposing the cutting box.
2. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: in the step S2, when the crushed stone is cleaned, the crushed stone with the granularity of more than 10cm is cleaned, and the crushed stone with the granularity of less than 10cm is backfilled in the groove of the underground continuous wall.
3. The process of claim 1, wherein the step S3 comprises the steps of:
A. measuring and paying off, and performing center line lofting on the diaphragm wall in the diaphragm wall grooving;
B. paving steel plate reinforcement treatment measures on the construction site to ensure that the construction site meets the requirement of mechanical equipment on the bearing capacity of the foundation, and excavating working grooves in the direction parallel to the central line of the continuous wall by using excavating equipment;
C. hoisting the pre-buried box, excavating a pre-buried hole by using excavating equipment, and hoisting the pre-buried box into the pre-buried hole by using a crane;
d, the trd device is in place;
E. hanging the cutting boxes section by section into the pre-buried holes and supporting and fixing; the TRD equipment host computer moves to pre-buried acupuncture point and puts the connection cutting case, and the host computer returns predetermined construction position again and carries out the cutting case and squeeze into the excavation process by oneself.
4. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: and step S3, the method further comprises the steps of installing an inclinometer, installing the inclinometer after the cutting box is driven into the designed depth by itself, installing the multi-section inclinometer in the cutting box, managing the vertical precision of the wall body, and ensuring the precision within 0.01.
5. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: and S4, when the grooves of the underground continuous wall are filled with the lightweight aggregate in the step, the lightweight aggregate comprises one or more of pumice, ceramsite, shale or expanded perlite, and the surface layer of the lightweight aggregate is backfilled with a layer of surface soil.
6. The process of claim 1, wherein the step S5 comprises the steps of:
F. firstly, excavating, namely injecting excavating fluid at the bottom of the cutting box to cut a soil layer for a certain distance in advance;
G. withdrawing and excavating, namely withdrawing and excavating the cutting box to the starting point of the prior excavation;
H. and (4) injecting a curing liquid into the cutting box to forcibly mix and stir the curing liquid and the in-situ soil body to form the equal-thickness cement soil underground continuous wall.
7. The process for constructing the cement-soil mixed continuous wall with the equal thickness as claimed in claim 6, wherein; and step S5, the method also comprises the steps of retreating excavation, forcibly mixing and stirring the curing liquid and the in-situ soil body by the cutting box, continuing excavation forwards, avoiding the cured underground continuous wall during excavation, and repeating the steps F-H.
8. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: and step S5, performing slurry fluidity test, taking a slurry sample on the upper layer of the continuous wall, performing fluidity test, and adjusting the water amount in the excavating fluid according to the fluidity test result.
9. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: and cleaning surface mud after the step of S5, and pumping and accumulating the surface mud at one end of the continuous wall through a sewage pump for uniform treatment.
10. The construction process of the equal-thickness cement-soil stirring continuous wall as claimed in claim 1, wherein the process comprises the following steps: in the step S6, after the construction of the continuous wall on one working face is finished, the TRD device host is used to pull out the cutting box in sections and disassemble the cutting box, the whole device is moved to another working face for assembly, the construction is continued, and the device is moved back after the construction is finished.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113638422A (en) * | 2021-09-04 | 2021-11-12 | 浙江艮威水利建设有限公司 | Deep foundation pit construction method |
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Application publication date: 20210611 |
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