CN119593385A - A joint bite water-stop reinforced ultra-deep 100-meter milling groove ground wall construction technology - Google Patents
A joint bite water-stop reinforced ultra-deep 100-meter milling groove ground wall construction technology Download PDFInfo
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- CN119593385A CN119593385A CN202411718035.9A CN202411718035A CN119593385A CN 119593385 A CN119593385 A CN 119593385A CN 202411718035 A CN202411718035 A CN 202411718035A CN 119593385 A CN119593385 A CN 119593385A
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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
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
- E02D19/185—Joints between sheets constituting the sealing aprons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention relates to a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process which comprises the steps of groove forming, groove bottom sediment treatment, steel reinforcement cage hoisting, conduit lowering, bottom sealing concrete pouring, broken stone backfilling, joint box hoisting, integral concrete pouring and the like. The grooving adopts a grabbing and milling combination process, and is divided into a first period groove section and a second period groove section, wherein the first period groove is designed to be full-first-width-opening, the two cutters are used for grooving, H-shaped steel water stop joints and full-wrapping anti-winding grout stop iron sheets are arranged at two ends of a reinforcement cage, sealing bottom concrete is poured after the reinforcement cage is hung in sections, broken stone is backfilled, the broken stone is compacted, and the pouring is continued to form a wall body. The second-stage groove is designed to be a full-closed width, the three cutters form grooves, and the joint is brushed with a wall brushing device to finish the rest process. The first-stage groove and the second-stage groove adopt a construction sequence of a 'jump bin method', and the continuous wall is formed by cyclic reciprocation. The process innovates the existing construction process of the ultra-deep milling joint ground wall, and solves the problems of low concrete milling speed, poor water stopping effect, large hoisting weight of the reinforcement cage and the like of the milling joint.
Description
Technical Field
The invention relates to the technical field of ultra-deep foundation pit construction in constructional engineering, in particular to a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process.
Background
With the deep excavation and efficient utilization of urban underground space resources, the development of shallow underground space is gradually saturated, and foundation pit excavation is forced to extend to a deeper level. Currently, the deep foundation pit excavation depth of a domestic soft soil area is approaching 60 meters, and future exploration to a deeper field is predicted. This trend has set unprecedented high standard requirements for the design and construction quality and safety performance of the enclosure structure of deep foundation pit engineering.
Aiming at ultra-deep foundation pit construction, underground continuous walls are generally adopted as building enclosures in China, the design depth of the building enclosures often reaches twice as much as the excavation depth of the foundation pit, so that the construction challenge of the underground continuous walls with the depth exceeding hundred meters is induced, and the severe test is provided for the exquisite degree and innovation capability of the construction process. The main technical bottlenecks faced by ultra-deep underground continuous wall construction include:
1. The grooving difficulty is high, the hardness of deep soil is obviously enhanced along with the increase of the grooving depth, the traditional grooving machine is difficult to reach the preset depth, and especially the grooving machine works in an ultra-deep hard sand layer, so that the grooving efficiency is low, even the grooving machine cannot effectively work, and the grooving machine becomes a serious obstacle in the initial stage of construction.
2. The steel reinforcement cage is complicated to hoist, the steel reinforcement cage required by the ultra-deep foundation pit is dense in reinforcement, the length and the weight are far and extremely regular, the technical difficulty of hoisting operation is greatly increased, the risk coefficient is also increased along with the increase, and higher requirements are put on the performance and the operation precision of hoisting equipment.
3. The joint has the technical problems that the joint is limited in form, the structural strength and the water stopping effect can be enhanced by using the rigid joint, but the weight of the reinforcement cage can be obviously increased, the hoisting load is increased, higher requirements are put on hoisting equipment, and meanwhile, the bearing capacity of a foundation and the stability of a groove section are influenced. In addition, the connection of the rigid joint is complex, the time consumption is long, the joint quality control is threatened, and the safety excavation of the deep foundation pit is difficult to ensure under the condition that soil at the joint is not thoroughly cleaned.
In order to solve the problems, the industry explores a construction scheme of adopting a grooving machine to form grooves and combining a sleeve milling joint, optimizes a reinforcement cage structure, lightens hoisting weight and realizes controllable risk. However, this solution is also not perfect and still suffers from the following drawbacks:
1. and the construction of the second-stage groove section requires milling of first-stage hard concrete, if the concrete strength on two sides is uneven, the perpendicularity of the groove section is affected, the first-stage reinforcement cage is possibly damaged, the joint quality is affected, and the whole stability of the underground continuous wall is endangered due to the splitting phenomenon of the deep joint.
2. The joint water-stopping effect is poor, namely, the sleeve milling joint depends on the concrete joint formed by the burrs formed by milling, the water-stopping effect is limited, the mud skin adhesion problem is more remarkable, the water-stopping performance is influenced, and a serious challenge is formed for ultra-deep foundation pit construction needing pumping down the pressure-bearing water. Although additional reinforcing water stopping measures can be taken, the technical reliability and cost control of the reinforcing water stopping measures in deep hard soil bodies remain difficult.
Therefore, how to provide a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process with low hoisting risk, high construction speed, strong wall rigidity and excellent joint water stop performance becomes a key technical problem to be solved urgently at present. The foundation stone is not only an innovation of the traditional construction technology, but also an important foundation stone for guaranteeing the safety and high-efficiency propulsion of ultra-deep foundation pit engineering.
Disclosure of Invention
The invention provides a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process, which aims to solve the technical problems.
In order to solve the technical problems, the invention provides a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process which is divided into a first-stage groove section and a second-stage groove section, wherein the first-stage groove section is positioned at two sides, the second-stage groove section is positioned between the first-stage groove sections at two sides,
The construction steps of the first-stage tank section comprise tank forming, tank bottom sediment treatment, first-stage tank section reinforcement cage processing and lifting, conduit lowering, bottom sealing concrete pouring, broken stone backfilling, joint box lifting and integral concrete pouring;
the construction steps of the secondary tank section comprise the steps of tank forming, tank bottom sediment treatment, wall brushing, secondary tank section reinforcement cage processing and hoisting, conduit lowering and integral concrete pouring of the secondary tank section to form a unit wall;
The first-stage groove section and the second-stage groove section are formed by adopting a grabbing and milling combined process, and the first-stage groove section and the second-stage groove section are formed into a wall by adopting a construction sequence of a 'jump bin method', and the continuous wall is formed in a circulating and reciprocating mode;
the tank bottom sediment treatment adopts a tank milling machine device to pump and reversely circulate to exchange slurry after descending to the tank bottom;
Brushing the wall by adopting a wall brushing device arranged at the grab bucket of the grooving machine;
The steel reinforcement cage of the first-stage groove section is provided with H-shaped steel water stop joints at the ends of two sides of the steel reinforcement cage, two sides of the joint are provided with anti-winding grouting iron sheets, two sides of the steel reinforcement cage of the second-stage groove section are provided with sealing steel bars, the sealing steel bars are matched with the H-shaped steel water stop joints, the steel reinforcement cage adopts a segmented hanging groove loading mode, when in butt joint, longitudinal steel bars are connected through lengthened straight thread sleeves, and the H-shaped steel water stop joints are connected through bolts.
Preferably, the grabbing and milling combination process comprises the steps of grooving the upper part of the groove section by a grooving machine within the range of 0-10 meters, and milling the groove to the bottom of the groove section by a grooving machine below the depth of 10 meters.
Preferably, the first-stage groove section adopts full-first open width, the groove forming width is 5m, the groove section width is 3 m, the two sides of the groove section are respectively reserved with 1m of backfill broken stone and are provided with the joint box, the groove forming adopts two cutters to form grooves, the first cutter milling groove width is 2.8 m, and the second cutter milling groove width is 2.2 m.
Preferably, the second-stage groove section adopts a full-closed width, the width of the groove section is 5-6 m, three cutters form grooves, a middle cutter is firstly constructed by adopting a grabbing and milling combined process, two cutters on two sides respectively adopt a grab bucket of a groove forming machine to grab backfill broken stones and soil bodies which are not milled, aiming at an area where the backfill broken stones cannot be grabbed and milled, the groove section is grabbed by the grab bucket after the wall brushing device is adopted to scoop backfill broken stones, and the wall brushing construction is carried out at the butt joint position by adopting the wall brushing device after the groove formation of the second-stage groove section is completed.
Preferably, the H-shaped steel water stop joint comprises H-shaped steel consisting of a web plate and two flanges and a water stop steel plate arranged in the middle of the web plate.
Preferably, the anti-winding flow grout stop iron sheet is arranged on H-shaped steel on two sides of the reinforcement cage of the first-stage groove section, the top through length of the reinforcement cage is set to the bottom of the cage, the anti-winding flow grout stop iron sheet is 4 sheets, the width is 1.5m, and the whole reinforcement cage is covered and wrapped.
Preferably, the joint box adopts two independent pieces, one end of the joint box is clamped between grooves formed by the water stop steel plate and the flange, the joint box is fully contacted with the web, and the other side of the joint box props against soil.
Preferably, the thickness of the water stop steel plate is 14mm, and the width of the water stop steel plate is 400mm.
Preferably, the height of the crushed stone backfill is less than 5 meters of the depth of the excavation surface and avoids the range of the connecting position by 3 meters.
Preferably, the crushed stone adopts regenerated stone with the grain diameter not smaller than 5cm, and is backfilled after being packed without a woven bag.
Compared with the prior art, the joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process provided by the invention has the following advantages:
1. The invention combines the advantages of a grooving machine and a milling machine by adopting a milling and grabbing combined process, effectively solves the problem of high hardness of deep soil and difficult grooving, solves the problem that the grooving of the second-stage groove section of the ground wall of the conventional milling joint needs to be carried out to mill the first-stage groove section hard concrete, remarkably improves the grooving efficiency and shortens the construction period;
2. the invention adopts the H-shaped steel water-stopping joint, reduces the overall weight of the reinforcement cage by reducing the width of the reinforcement cage of the first-period slot section ground wall, realizes that the ultra-deep ground wall adopts a rigid joint, ensures the tight engagement of the joint between the first-period slot and the second-period slot, reduces the hoisting risk and ensures the connection strength and water-stopping effect of the joint;
3. By using the wall brushing device, the invention can effectively treat backfill broken stone, mud clamping, turbulent mortar and the like at the joint, further improve joint quality and provide powerful guarantee for deep foundation pit excavation;
4. the construction process disclosed by the invention is suitable for various geological conditions and engineering requirements, and particularly has excellent performance in ultra-deep foundation pit construction in soft soil areas and high-hardness soil layers.
Drawings
FIG. 1 is a flow chart of a joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process in an embodiment of the invention;
FIG. 2 is a schematic view of a construction step of a first-stage trough section according to an embodiment of the present invention;
FIG. 3 is a schematic view of a construction step of a second-stage trough section according to an embodiment of the present invention;
FIG. 4 is a schematic view of a secondary trough section trough-forming grab bucket and brush wall according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a wall forming sequence of "skip bin method" according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a first-stage trough section wall according to one embodiment of the present invention;
FIG. 7 is a schematic view of a water stop joint for H-steel in accordance with an embodiment of the present invention;
fig. 8 is an enlarged view of a portion a of fig. 7.
In the figure, the steel bar cage for the first period of tank section, the steel bar cage for the second period of tank section, 21-sealing steel bars, 30-H-shaped steel water stop joints, 31-flanges, 32-webs, 33-water stop steel plates, 34-first angle steel, 35-second angle steel, 36-layering steel plates, 40-winding-proof grouting iron sheets, 50-back cover concrete, 51-guide pipes, 60-broken stones, 70-joint boxes, 80-groove forming machine grab buckets and 90-wall brushing devices are shown.
Detailed Description
In order to more fully describe the technical aspects of the invention, specific examples are set forth below to demonstrate technical effects, and it should be emphasized that these examples are intended to illustrate the invention and not to limit the scope of the invention.
The invention provides a joint occlusion water-stop reinforced ultra-deep hundred-meter-level slot milling ground wall construction process, which is divided into a first-stage slot section and a second-stage slot section as shown in fig. 1 to 8, wherein the first-stage slot section is positioned at two sides, and the second-stage slot section is positioned between the first-stage slot sections at two sides, wherein:
The construction steps of the first-stage tank section comprise the steps of tank forming of the first-stage tank section, tank bottom sediment treatment, processing and hoisting of the first-stage tank section reinforcement cage 10, lowering of a guide pipe 51, pouring of bottom sealing concrete 50, backfilling of broken stone 60, hoisting of a joint box 70 and integral concrete pouring, specifically, after the first-stage tank section reinforcement cage 10 is hoisted in place, placing of the guide pipe 51, pouring of the bottom sealing concrete 50, backfilling of broken stone 60, hoisting of the joint box 70 to compact the broken stone 60, backfilling and filling of the gap between the joint box 70 and one side of a soil body by the broken stone 60 after the joint box 70 is hoisted in place, and integral concrete pouring to form a unit wall body.
The construction steps of the secondary tank section comprise the steps of tank forming of the secondary tank section, sediment treatment at the tank bottom, wall brushing, processing and hoisting of the reinforcement cage 20 of the secondary tank section, lowering of the guide pipe 51 and integral concrete pouring, so that a unit wall is formed. Specifically:
The first-stage tank section and the second-stage tank section are formed by adopting a grabbing and milling combined process, and the first-stage tank section and the second-stage tank section are formed into a wall by adopting a construction sequence of a 'jump bin method', and the continuous wall is formed by circulating and reciprocating. The invention combines the advantages of a grooving machine and a milling machine by adopting a grabbing and milling combined process, effectively solves the problem of high hardness of deep soil and difficult grooving, solves the problem that the grooving of the second-stage groove section of the ground wall of the conventional milling joint needs to be carried out to mill the first-stage groove section hard concrete, remarkably improves the grooving efficiency and shortens the construction period.
And pumping reverse circulation slurry exchange is carried out after the tank bottom sediment treatment adopts a tank milling machine device to descend to the tank bottom.
The wall brushing device 90 arranged at the grab bucket 80 of the grooving machine is adopted for brushing walls, the wall brushing device 90 is matched with the H-shaped steel water stop joint 30, and the process requirements of backfilling broken stone 60 at the shoveling joint and brushing walls of the joint can be met, so that the backfilling broken stone, mud clamping, turbulent mortar and the like at the joint can be effectively treated, the joint quality is further improved, and powerful guarantee is provided for deep foundation pit excavation.
Because the reinforcement cage in this embodiment is a hundred-meter-level overlong overweight reinforcement cage, the two side ends of the first-stage groove section reinforcement cage 10 are provided with H-steel water stop joints 30, two sides of each joint are provided with anti-winding grouting iron sheets 40, two sides of the second-stage groove section reinforcement cage 20 are provided with sealing reinforcement 21, the sealing reinforcement 21 is matched with the H-steel water stop joints 30, in this embodiment, the sealing reinforcement 21 is in an M shape, the reinforcement cage (comprising the first-stage groove section reinforcement cage 10 and the second-stage groove section reinforcement cage 20) is hung in a groove-loading mode in sections, and when in butt joint, longitudinal reinforcement is connected quickly by adopting lengthened straight thread sleeves, the number of the reinforcement joints with the same section is staggered according to the standard requirement, and the H-steel water stop joints 30 are connected by bolts. The H-shaped steel water stop joint 30 adopted by the invention can reduce the overall weight of the reinforcement cage by reducing the width of the reinforcement cage of the first-stage groove section ground wall, realize that the ultra-deep ground wall adopts a rigid joint, ensure the tight engagement of the joints of the first-stage groove section and the second-stage groove section, reduce the lifting risk and ensure the connection strength and the water stop effect of the joint.
The invention has obvious beneficial effects in the aspects of improving construction efficiency, enhancing safety of the enclosure structure, optimizing seam water stop effect, reducing construction cost and environmental influence, improving construction flexibility and adaptability and the like, and has important significance for promoting deep development and utilization of urban underground space.
In some embodiments, the grabbing and milling combined process comprises the steps of grooving the upper part of the groove section by adopting a grooving machine within the range of 0-10 meters, enabling a milling bucket of the grooving machine to enter the groove section, and milling the groove to the bottom of the groove section by adopting the grooving machine below the depth of 10 meters, so as to ensure that the grooving verticality reaches 1/1000.
In some embodiments, please refer to fig. 2, the first-stage trough section adopts a full-open width, the trough forming width is 5 meters, the trough section width is 3 meters, the two sides of the trough section are respectively reserved with 1 meter-wide backfilled crushed stones 60 and the joint box 70 is installed, the trough forming adopts two cutters for forming the trough, the first cutter is 2.8 meters in width, and the second cutter is 2.2 meters in width.
In some embodiments, please refer to fig. 3 and fig. 4 with emphasis on the point, the second-stage tank section adopts a full-closed width, the width of the tank section is 5m to 6m, three-knife tank forming is performed, a middle one knife is firstly constructed by adopting a combination process of grabbing and milling, two sides of each one knife adopt a grab bucket 80 of a tank forming machine to grab backfilled gravels 60 and non-milled soil bodies, aiming at the area where the butt joint cannot grab and mill, the backfilled gravels 60 are shoveled by adopting the wall brushing device 90 and then the tank section is grabed by the grab bucket, and after the second-stage tank section tank forming is completed, the wall brushing construction is performed at the butt joint by adopting the wall brushing device 90.
In some embodiments, please refer to fig. 5, the construction sequence of the "skip method" is shown as1→3→5→2→7→4 according to the number of the slot segments (the singular number is the first slot segment and the plural number is the second slot segment), and the second slot segment needs to start to form a slot after the first slot segment on both sides is completed for 24 hours.
In some embodiments, please refer to fig. 6 and 7, the water stop joint 30 of the H-steel includes an H-steel (the height of the H-steel is selected according to the design of the channel section and the width of the channel section should be smaller) formed by a web 32 and two flanges 31, and a water stop steel plate 33 installed in the middle of the web 32, specifically, the water stop steel plate 33 and the web 32 are fully welded to promote the water stop effect at the joint of the H-steel, and in addition, a first angle steel 34 is welded at the joint of the water stop steel plate 33 and the web 32 to ensure the connection strength of the water stop steel plate 33 and the H-steel. In some embodiments, the water stop steel plate 33 has a thickness of 14mm and a width of 400mm.
In some embodiments, please refer to fig. 2 and fig. 6 to fig. 8, the anti-winding grouting stop sheet iron 40 is installed on the H-shaped steel at two sides of the first-stage groove section steel reinforcement cage 10, the length of the steel reinforcement cage is set to the bottom of the cage, the anti-winding grouting stop sheet iron 40 is 4 sheets, the width is 1.5 meters, the whole steel reinforcement cage is covered and wrapped, and when the joint box 70 and the gravel 60 backfill area for preventing the concrete mortar from entering the outer side of the H-shaped steel in a winding manner are reached, the backfill gravel 60 can be prevented from entering the first-stage groove section steel reinforcement cage 10, thereby affecting the quality of the wall concrete. Specifically, the flange 31 is welded with a second angle steel 35, each second angle steel 35 is provided with a bolt hole at 50cm intervals, and the anti-winding grouting iron sheet 40 is fixed on the H-shaped steel water stop joint 30 by adopting a layering steel plate 36 through a bolt fixing mode.
In some embodiments, please refer to fig. 6, the method of installing the reinforcement cage in the trough by section hanging is that the section position of the reinforcement cage top cage is preferably set 5 meters or more below the bottom surface of the foundation pit, in addition, because other conditions cannot meet the requirement of the section position, the section position is preferably avoided from the range of 5 meters above and below the bottom surface, then a suitable hanging device is selected according to the weight and length of the section cage, and the installation is suspended in the trough by adopting a double-machine lifting hanging method. According to the invention, the construction process is optimized, the hoisting risk is reduced, and the dependence on large hoisting equipment is reduced, so that the construction cost is reduced.
In some embodiments, the backfilling height of the broken stone 60 is less than 5 meters of the depth of the excavation surface and avoids the range of the connecting position of 3 meters, so that huge lateral pressure formed by concrete pouring is prevented from causing the joint weak part of the I-steel to be propped open to enable concrete to flow into the backfilling section and affect the secondary groove section to form grooves, in some embodiments, the broken stone 60 can adopt regenerated stone, resources are saved, waste emission is reduced, the concept of green construction is met, and the construction cost and the influence on the environment are reduced. The particle size of the stone is not less than 5cm, in the embodiment, 5-10 cm, so that the phenomenon that the broken stone 60 flows into a reinforcement cage to affect the quality of a wall body is prevented, and in addition, the broken stone 60 is filled into bags without woven bags and backfilled, so that the woven bags are prevented from blocking a sand suction opening and a slurry pipe of a slot milling machine, and normal slot milling cannot be caused.
In some embodiments, please refer to fig. 2, the joint box 70 is two independent pieces, one end of the joint box 70 is clamped between the grooves formed by the water stop steel plate 33 and the flange 31, and is fully contacted with the web plate 32, and the other side of the joint box is propped against the soil, so that lateral pressure formed by casting concrete is transferred to the soil, and the situation that the H-shaped steel water stop joint 30 is deviated is prevented from affecting the joint quality.
The construction process is suitable for various geological conditions and engineering requirements, and particularly has excellent performance in the construction of ultra-deep foundation pits in soft soil areas and high-hardness soil layers. Through flexible joint form and steel reinforcement cage processing mode, can adjust and optimize according to specific engineering condition, improve flexibility and the adaptability of construction.
In conclusion, the joint occlusion water-stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process provided by the invention not only solves the problems of low milling speed of a milling joint, low water-stop effect of a joint, but also solves the problems of heavy hoisting weight, complex operation and high risk of a rigid joint ground wall reinforcement cage, and is not suitable for ultra-deep underground continuous wall construction. The underground continuous wall formed by the method has the advantages of controllable hoisting risk, high wall forming speed, high wall rigidity, good joint water stopping effect and the like, and can enable the depth of the ultra-deep foundation pit to be further deeper under the condition of ensuring controllable influence of surrounding environment.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process is characterized by being divided into a first-stage groove section and a second-stage groove section, wherein the first-stage groove section is positioned at two sides, the second-stage groove section is positioned between the first-stage groove sections at two sides,
The construction steps of the first-stage tank section comprise tank forming, tank bottom sediment treatment, first-stage tank section reinforcement cage processing and lifting, conduit lowering, bottom sealing concrete pouring, broken stone backfilling, joint box lifting and integral concrete pouring;
the construction steps of the secondary tank section comprise the steps of tank forming, tank bottom sediment treatment, wall brushing, secondary tank section reinforcement cage processing and hoisting, conduit lowering and integral concrete pouring of the secondary tank section to form a unit wall;
The first-stage groove section and the second-stage groove section are formed by adopting a grabbing and milling combined process, and the first-stage groove section and the second-stage groove section are formed into a wall by adopting a construction sequence of a 'jump bin method', and the continuous wall is formed in a circulating and reciprocating mode;
the tank bottom sediment treatment adopts a tank milling machine device to pump and reversely circulate to exchange slurry after descending to the tank bottom;
Brushing the wall by adopting a wall brushing device arranged at the grab bucket of the grooving machine;
The steel reinforcement cage of the first-stage groove section is provided with H-shaped steel water stop joints at the ends of two sides of the steel reinforcement cage, two sides of the joint are provided with anti-winding grouting iron sheets, two sides of the steel reinforcement cage of the second-stage groove section are provided with sealing steel bars, the sealing steel bars are matched with the H-shaped steel water stop joints, the steel reinforcement cage adopts a segmented hanging groove loading mode, when in butt joint, longitudinal steel bars are connected through lengthened straight thread sleeves, and the H-shaped steel water stop joints are connected through bolts.
2. The joint occlusion water-stop reinforced ultra-deep hundred-meter-level groove milling ground wall construction process is characterized in that the grabbing and milling combined process comprises the steps of grooving the upper portion of a groove section by a grooving machine in the range of 0-10 meters, and milling the groove to the bottom of the groove section by the grooving machine below the depth of 10 meters.
3. The joint occlusion water-stop reinforced ultra-deep hundred-meter-level groove milling ground wall construction process according to claim 2, wherein the first-stage groove section adopts full-head open width, the groove forming width is 5 meters, the groove section width is 3 meters, backfill gravels with a width of 1 meter are reserved on two sides of the groove section, the joint box is installed, the groove forming adopts two cutters to form grooves, the width of the first cutter groove milling is 2.8 meters, and the width of the second cutter groove milling is 2.2 meters.
4. The joint occlusion water-stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process according to claim 3, wherein the secondary groove section is of a full-closed width, the width of the groove section is 5-6 meters, three cutters are used for grooving, a middle cutter is firstly constructed by adopting a grabbing and milling combined process, backfill gravels and non-milled soil bodies are grabbed out by adopting a grab bucket of a grooving machine on two sides, aiming at a region where the backfill gravels cannot be grabbed and milled, the backfill gravels are grabbed out of the groove section by the grab bucket after being shoveled by adopting the wall brushing device, and the wall brushing device is adopted for wall brushing construction at the butt joint after the groove section is formed.
5. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process according to claim 1, wherein the H-shaped steel water stop joint comprises an H-shaped steel consisting of a web plate and two flanges and a water stop steel plate arranged in the middle of the web plate.
6. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process of claim 5, wherein the anti-winding flow stop iron sheets are arranged on H-shaped steel on two sides of a reinforcement cage of the primary groove section, are arranged to the bottom of the cage from the top through length of the reinforcement cage, are 4 sheets and are 1.5 m in width, and cover and wrap the whole reinforcement cage.
7. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process according to claim 5, wherein the joint box is two independent pieces, one end of the joint box is clamped between grooves formed by the water stop steel plate and the flange, the joint box is fully contacted with the web, and the other end of the joint box is propped against soil.
8. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process of claim 5, wherein the water stop steel plate has a thickness of 14mm and a width of 400mm.
9. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process of claim 1, wherein the crushed stone backfill height is less than 5 meters deep of the excavation surface and avoids the connection position by 3 meters.
10. The joint occlusion water stop reinforced ultra-deep hundred-meter-level milling groove ground wall construction process according to claim 9, wherein the crushed stone is regenerated stone with the grain size not smaller than 5cm, and the crushed stone is backfilled after being bagged without a woven bag.
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Cited By (1)
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| CN120486363A (en) * | 2025-07-18 | 2025-08-15 | 杭州江润科技有限公司 | Ultra-deep special-shaped underground continuous wall and construction method thereof |
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