CN113216152A - Underground diaphragm wall anti-streaming structure under medium-thickness sand layer condition and construction method thereof - Google Patents
Underground diaphragm wall anti-streaming structure under medium-thickness sand layer condition and construction method thereof Download PDFInfo
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- CN113216152A CN113216152A CN202110527798.5A CN202110527798A CN113216152A CN 113216152 A CN113216152 A CN 113216152A CN 202110527798 A CN202110527798 A CN 202110527798A CN 113216152 A CN113216152 A CN 113216152A
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- 239000004576 sand Substances 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 230000002787 reinforcement Effects 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 239000010721 machine oil Substances 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- 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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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses an anti-streaming structure of a diaphragm wall under the condition of a medium-thickness sand layer and a construction method thereof, wherein the anti-streaming structure comprises I-shaped steels arranged at two ends of a reinforcement cage, the side surfaces of the I-shaped steels close to the wall of the cage are connected with anti-streaming iron sheets, one ends of the anti-streaming iron sheets are fixedly connected with the I-shaped steels, and the other ends of the anti-streaming iron sheets extend towards the opposite direction of the movement of concrete when the concrete is poured; according to the invention, the anti-streaming iron sheet is arranged on the outer side of the I-shaped steel wing plate, so that the streaming of concrete can be initially blocked; the square hole is designed on the surface of the joint box, so that the joint box can enter the groove, the buoyancy force applied when the joint box is transferred is reduced, and the transfer difficulty of the joint box is reduced; according to the invention, the connecting plate is arranged at the top of the joint box, and the connecting hole is arranged at the bottom of the joint box, so that the splicing of a plurality of sections of joint boxes is facilitated.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to an underground diaphragm wall anti-streaming structure under the condition of a medium-thickness sand layer and a construction method thereof.
Background
Along with the stereo continuous amplification of city scale, the required size of the foundation pit of the building is continuously increased and deepened. The diaphragm wall serves as a foundation pit supporting structure body, the effect of the diaphragm wall is more prominent, and the diaphragm wall has the functions of blocking soil, inhibiting permeation and the like. During the construction of underground continuous walls, the walls are formed by casting in a framing manner, all groove sections are connected by end structures, and most of the existing underground continuous wall joints adopt I-shaped steel. However, in the construction process of pouring concrete into the diaphragm wall, because the reinforcement cage needs a certain concrete protective layer thickness, a larger space is formed between the i-steel at the two ends of the reinforcement cage and the wall of the diaphragm wall, the poured concrete is easy to flow around to the other side of the i-steel from the position, and a concrete block is formed at the web of the i-steel, so that the descending construction of the next diaphragm wall reinforcement cage is influenced, particularly under the geological condition of a medium-thickness sand layer, the stability of the sand layer is poor, and a hole collapse is easy to occur during the grooving construction, so that a larger concrete flow-around channel is formed at the i-steel; meanwhile, if the I-shaped steel web plates have concrete blocks, a through gap is easily formed between the two underground diaphragm walls, a water leakage channel is formed after the foundation pit is excavated, and hidden danger is brought to the excavation of the foundation pit.
At present, the existing construction method for preventing the streaming of the diaphragm wall generally adopts a sand bag filled in a joint, so that a gap in the joint is blocked, and the streaming of concrete is blocked. However, the method for blocking the concrete from flowing around needs to consume a large amount of labor and time, has low construction efficiency and poor construction effect, and a certain gap still exists between the sand bags.
Disclosure of Invention
The invention provides an anti-streaming structure of a diaphragm wall under the condition of a medium-thickness sand layer, which aims to solve the problems that the existing method for blocking concrete streaming in the background art needs to consume a large amount of labor and time, has low construction efficiency and poor construction effect, and certain gaps still exist among sand bags.
The technical scheme of the invention is realized as follows:
the anti-streaming structure of the diaphragm wall under the condition of the medium-thickness sand layer comprises I-shaped steel arranged at two ends of a reinforcement cage, wherein the side surface of the I-shaped steel close to the wall of the reinforcement cage is connected with an anti-streaming iron sheet, one end of the anti-streaming iron sheet is fixedly connected with the I-shaped steel, and the other end of the anti-streaming iron sheet extends towards the opposite direction of the movement of concrete when the concrete is poured;
the ground connecting wall anti-streaming structure further comprises a joint box arranged in an I-shaped steel outer groove, wing plates extending outwards are arranged at the edge positions of two sides of the joint box, and the wing plates are arranged at one end far away from the I-shaped steel; the distance between the edges of the two wing plates is larger than the opening distance of the I-shaped steel; the bottom of the joint box is of an open structure, and a connecting plate which is convenient to insert into the open position of the bottom of the joint box is welded at the top of the joint box.
Preferably, the bottom of the joint box is of an open structure, a connecting plate which is convenient to insert into the opening position of the bottom of the joint box is welded at the top of the joint box, a first through connecting hole is formed in the middle of the connecting plate, the width of the connecting plate is smaller than that of the opening of the bottom of the joint box, and a second connecting hole is formed below the joint box.
Preferably, a hanging plate is fixedly mounted above the connecting plate, and a through hanging hole is formed in the middle of the hanging plate.
Preferably, the number of the connecting plates is two.
Preferably, the back of the joint box is provided with a plurality of through holes for facilitating the passing of slurry.
Preferably, the through-holes are square holes, and the plurality of square holes are arranged at equal intervals in the longitudinal direction of the joint housing.
In addition, the invention also provides a construction method of the underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer, which comprises the following steps:
s1, treating the medium-thickness sand layer foundation: before the underground diaphragm wall is constructed, constructing three-axis stirring piles on two sides of the underground diaphragm wall to reinforce the foundation;
s2, manufacturing an anti-streaming iron sheet on the side surface of the I-shaped steel: welding an anti-streaming iron sheet on the outer side of the I-shaped steel, wherein one end of the anti-streaming iron sheet is a fixed end, and the other end of the anti-streaming iron sheet is a movable end;
s3, hoisting of the joint box: after the reinforcement cage and the I-steel at two ends are placed in the underground diaphragm wall groove, hoisting a joint box, coating engine oil on the surface of the joint box contacting the I-steel during hoisting, hoisting a hoisting hook on a hoisting plate at the top of a first joint box by using a hoisting machine, placing the hoisting hook along an opening on the outer side of the I-steel, keeping the joint box tightly attached to the I-steel, and fixing the joint box at the notch when the head of the joint box is hoisted to the notch position; then hoisting a second joint box, sleeving the bottom of the second joint box on the connecting plate at the top of the first joint box, aligning the connecting holes I and II, inserting the cylindrical steel bolts into the connecting holes I and II, and fixing to complete the connection of the two joint boxes; the hoisting of the plurality of joint boxes is repeated until the joint boxes are lowered to the designed height;
s4, backfilling a sand bag: after the joint box is hoisted, backfilling a sand bag in a space behind the joint box to ensure that the sand bag is backfilled compactly, and meanwhile, extruding the joint box to be tightly attached to the I-shaped steel until the sand bag is filled above a pouring surface;
s5, hanging and pulling of the joint box: the hydraulic jacking machine is hung at a joint box on the notch, the joint box penetrates through a slotted hole in the middle of the hydraulic jacking machine, the height of the jack is adjusted, a round hole of a cross bar at the top of the jack is aligned to a first connecting hole of a joint box connecting plate, and the joint box can be hung and pulled through connection and fixation of a cylindrical steel bolt; after initial setting of concrete pouring, a hydraulic jacking machine is needed to lift and pull the joint box, the joint box is lifted once every 30min, and the lifting is 50-100 mm each time, so that the joint box cannot be pulled out due to concrete condensation; after the concrete is initially set for 4 hours, the joint box is loosened by the hydraulic jacking machine, the hydraulic jacking machine is removed, and the joint box is completely pulled out by adopting a crane.
In the step S3, after the connector box is lowered to the designed height, the connector box is pressed into the soil layer at the bottom of the groove by a press machine for 30-50 cm; the top of the joint box is higher than the notch by more than 2 m.
In step S4, the sand bag is backfilled by a small amount of continuous backfilling, and the sand bag is tamped by a heavy hammer after each backfilling for 5m height, so as to make the sand bag backfill tightly.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the anti-streaming iron sheet is arranged on the outer side of the I-shaped steel wing plate, so that the streaming of concrete can be initially blocked;
(2) the square hole is designed on the surface of the joint box, so that the joint box can enter the groove, the buoyancy force applied when the joint box is transferred is reduced, and the transfer difficulty of the joint box is reduced;
(3) according to the invention, the connecting plate is arranged at the top of the joint box, and the connecting hole is arranged at the bottom of the joint box, so that the splicing of a plurality of sections of joint boxes is facilitated;
(4) after the reinforcement cage is put in place, the joint box is put down behind the I-shaped steel, so that the I-shaped steel can be prevented from deforming and shifting in the concrete pouring process, and meanwhile, the effect of preventing concrete from flowing around is achieved;
(5) the invention can effectively prevent the concrete from flowing around, simultaneously reduce the manpower and material resources required by the backfilling of the sand bag, greatly improve the construction efficiency, reduce the construction cost and ensure the construction quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a construction structure view of the present invention;
FIG. 2 is an enlarged partial view of the present invention;
FIG. 3 is a front view of the joint box of the present invention;
FIG. 4 is a rear view of the joint box of the present invention;
FIG. 5 is a side view of the joint box of the present invention;
FIG. 6 is a bottom view of the joint box of the present invention;
FIG. 7 is a first schematic view of the hoisting of the joint box of the present invention;
FIG. 8 is a second schematic view of the hoisting of the joint box of the present invention;
FIG. 9 is a schematic view of the hanging and pulling joint box of the present invention.
Wherein:
1. i-shaped steel; 2. a flow-around prevention iron sheet; 3. a sandy soil bag; 4. a reinforcement cage; 5. a joint box; 6. a connecting plate; 7. a first connecting hole; 8. a hanger plate; 9. hoisting holes; 10. a wing plate; 11. a square hole; 12. a second connecting hole; 13. hoisting a crane; 14. and (4) a hydraulic jacking machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, the anti-streaming structure for the underground diaphragm wall under the condition of the medium-thickness sand layer comprises I-shaped steel 1 installed at two ends of a reinforcement cage 4, wherein the side surface of the I-shaped steel 1 close to the wall of the reinforcement cage is connected with an anti-streaming iron sheet 2, one end of the anti-streaming iron sheet 2 is fixedly connected with the I-shaped steel 1, and the other end of the anti-streaming iron sheet extends towards the opposite direction of the movement of concrete when the concrete is poured;
the ground connecting wall anti-streaming structure further comprises a joint box 5 arranged in a groove outside the I-shaped steel 1, wing plates 10 extending outwards are arranged at the edge positions of two sides of the joint box 5, the wing plate 10 is arranged at one end far away from the I-shaped steel 1, the bottom of the joint box 5 is of an open structure, the top of the joint box 5 is welded with a connecting plate 6 which is convenient to be inserted into the opening position at the bottom of the joint box 5, the middle part of the connecting plate 6 is provided with a through connecting hole I7, the width of the connecting plate 6 is less than that of the opening at the bottom of the joint box 5, a second connecting hole 12 is arranged below the joint boxes 5, so that when the joint boxes 5 are lowered, a plurality of joint boxes 5 are connected end to end, the connecting plate 6 is inserted into the bottom of the joint box 5 above, and after the connecting hole I7 and the connecting hole II 12 are mutually corresponding, the steel bolt is inserted to realize the connection of the upper joint box 5 and the lower joint box 5.
Specifically, a hanging plate 8 is fixedly mounted above the connecting plate 6, and a through hanging hole 9 is formed in the middle of the hanging plate 8 and used for inserting a lifting hook of a crane into the hanging hole 9 to complete the hoisting construction of the joint box 5.
Specifically, the number of the connecting plates 6 is two, so as to improve the firm stability of the connection between the joint boxes 5, and also ensure the stable connection between the joint boxes 5 when one of the connecting plates 6 is damaged.
Specifically, a plurality of through-holes that are convenient for mud to pass through are seted up to joint box 5's back position, and this through-hole is square hole 11, and a plurality of square holes 11 are arranged along the length direction of joint box 5's equidistant range and are set up for in-process that joint box 5 transferred, the bottom opening and the square hole 11 position of joint box 5 can be followed to the mud of inslot pass through, avoid mud to block up and form the cavity in joint box 5 is inside, prevent to produce great buoyancy, influence the transferring of joint box 5.
Specifically, the distance between the edges of the two wing plates 10 is larger than the opening distance of the I-shaped steel 1, the two wing plates 10 are tightly attached to the I-shaped steel 1 in the process of lowering the joint box 5, a certain guiding effect is achieved, and a certain limiting effect is achieved when the sand bag 3 is filled.
A construction method of an underground diaphragm wall anti-streaming structure under the condition of a medium-thickness sand layer comprises the following steps:
s1, treating the medium-thickness sand layer foundation: because the geological stability of the sand layer is poor, the hole collapse phenomenon is easy to occur in the process of grooving construction of the diaphragm wall, so that a larger concrete streaming channel is formed, and the medium-thickness sand layer needs to be treated on the foundation, so that before the diaphragm wall is constructed, three-shaft mixing piles are constructed on two sides of the diaphragm wall to reinforce the foundation, and the streaming channel is prevented from being enlarged;
s2, manufacturing an anti-streaming iron sheet 2 on the side surface of the I-steel 1: the anti-streaming iron sheet 2 is welded on the outer side of the I-shaped steel 1, one end of the anti-streaming iron sheet 2 is a fixed end, and the other end of the anti-streaming iron sheet 2 is a movable end, so that the anti-streaming iron sheet 2 is opened due to the impact of concrete and is tightly attached to the wall of a wall to have a certain blocking effect on the concrete streaming;
s3, hoisting of the joint box 5: after the reinforcement cage 4 and the I-steel 1 at two ends are placed in the underground diaphragm wall groove, hoisting the joint box 5, coating engine oil on the surface of the joint box 5 contacting the I-steel 1 during hoisting, hoisting a hoisting hook on a hoisting plate 8 at the top of the first joint box 5 by using a hoisting machine 13, placing the hoisting hook down along an opening on the outer side of the I-steel 1, keeping the joint box 5 tightly attached to the I-steel 1, and fixing the joint box 5 at the notch when the head of the joint box 5 is hoisted to the notch position; then, hoisting a second joint box 5, sleeving the bottom of the second joint box 5 on the connecting plate 6 at the top of the first joint box 5, aligning the connecting holes I7 and II 12, inserting the cylindrical steel bolts into the connecting holes I7 and II 12, and fixing to complete the connection of the two joint boxes 5; the hoisting of the plurality of joint boxes 5 is repeated until the joint boxes 5 are lowered to the designed height;
s4, backfilling a sand bag 3: after the joint box 5 is hoisted, backfilling a sand bag 3 in a space behind the joint box 5 to ensure that the sand bag 3 is backfilled compactly, and meanwhile extruding the joint box 5 to be tightly attached to the I-shaped steel 1 until the sand bag 3 is filled above a pouring surface;
s5, hanging and pulling of the joint box 5: under the action of the backfilled sand bag 3 and the poured concrete, the joint box 5 is completely attached to the I-shaped steel 1, the hoisting construction can not be carried out by the hoisting machine 13, the joint box 5 can be hoisted only after the joint box 5 is loosened and hoisted by the hydraulic jacking machine 14, the hydraulic jacking machine 14 is hoisted at the joint box 5 on the notch, the joint box 5 penetrates through a slotted hole in the middle of the hydraulic jacking machine 14, the height of the jack is adjusted, a round hole of a cross bar at the top of the jack is aligned to a first connecting hole 7 of a connecting plate 6 of the joint box 5, and the joint box 5 can be hoisted and pulled through the connection and fixation of a cylindrical steel bolt; after the concrete is poured and initially set, the joint box 5 needs to be lifted and pulled up by a hydraulic jacking machine 14, the joint box is lifted up once every 30min, and the lifting is 50-100 mm each time, so that the joint box 5 cannot be pulled out due to concrete condensation; after the concrete is initially set for 4 hours, the joint box 5 is loosened by the hydraulic jack 14 at this time, the hydraulic jack 14 is removed, and the joint box 5 is completely pulled out by the crane 13.
In step S3, after the joint box 5 is lowered to the designed height, the joint box 5 is pressed into the soil layer at the bottom of the groove by a press machine for 30-50cm so as to prevent the concrete from flowing around from the bottom of the joint box 5; the top of the joint box 5 is higher than the notch by more than 2m so as to facilitate the pulling out of the joint box 5.
In step S4, the sand bag 3 is backfilled by a small amount of continuous backfilling to prevent a large amount of sand bags 3 from entering the tank and blocking, which affects the backfilling effect, and after each backfilling for 5m, the sand bag 3 is hammered by a heavy hammer to make the sand bag 3 backfilled densely.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a ground is wall around structure of flowing under medium thickness sand bed condition which characterized in that: the steel bar anti-streaming concrete pouring device comprises I-shaped steel (1) arranged at two ends of a steel reinforcement cage (4), wherein the side surface of the I-shaped steel (1) close to the wall of a groove is connected with an anti-streaming iron sheet (2), one end of the anti-streaming iron sheet (2) is fixedly connected with the I-shaped steel (1), and the other end of the anti-streaming iron sheet extends towards the opposite direction of concrete movement when concrete is poured;
the ground-connecting wall anti-streaming structure further comprises a joint box (5) arranged in an outer groove of the I-shaped steel (1), wing plates (10) extending outwards are arranged at the edge positions of two sides of the joint box (5), the wing plates (10) are arranged at one end far away from the I-shaped steel (1), and the distance between the edges of the two wing plates (10) is larger than the opening distance of the I-shaped steel (1); the bottom of the joint box (5) is of an open structure, and a connecting plate (6) which is convenient to insert into the open position at the bottom of the joint box (5) is welded at the top of the joint box (5).
2. The underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 1, characterized in that: the middle part of the connecting plate (6) is provided with a through connecting hole I (7), the width of the connecting plate (6) is smaller than that of an opening at the bottom of the joint box (5), and a connecting hole II (12) is formed below the joint box (5).
3. The underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 1, characterized in that: and a hanging plate (8) is fixedly arranged above the connecting plate (6), and a through hanging hole (9) is formed in the middle of the hanging plate (8).
4. The underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 1, characterized in that: the number of the connecting plates (6) is two.
5. The underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 1, characterized in that: the back position of joint box (5) is seted up a plurality of through-holes of being convenient for mud to pass through.
6. The underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 4, characterized in that: the through holes are square holes (11), and the square holes (11) are arranged at equal intervals along the length direction of the joint box (5).
7. A construction method of the ground connecting wall anti-streaming structure as claimed in claims 1-6, characterized by comprising the following steps:
s1, treating the medium-thickness sand layer foundation: before the underground diaphragm wall is constructed, constructing three-axis stirring piles on two sides of the underground diaphragm wall to reinforce the foundation;
s2, manufacturing an anti-streaming iron sheet (2) on the side surface of the I-shaped steel (1): an anti-streaming iron sheet (2) is welded on the outer side of the I-shaped steel (1), one end of the anti-streaming iron sheet (2) is a fixed end, and the other end of the anti-streaming iron sheet is a movable end;
s3, hoisting of the joint box (5): after a steel reinforcement cage (4) and I-beams (1) at two ends are placed in a ground wall groove, hoisting a joint box (5), coating machine oil on the surface of the joint box (5) contacting the I-beams (1) during hoisting, hoisting a lifting hook on a lifting plate (8) at the top of the first joint box (5) by using a hoisting machine (13), lowering the lifting hook along an opening on the outer side of the I-beam (1), keeping the joint box (5) tightly attached to the I-beam (1), and fixing the joint box (5) at a notch when the head of the joint box (5) is hoisted to the notch position; then, hoisting a second joint box (5), sleeving the bottom of the second joint box (5) on a connecting plate (6) at the top of the first joint box (5), aligning the connecting hole I (7) and the connecting hole II (12), inserting the cylindrical steel bolt into the connecting hole I (7) and the connecting hole II (12), and fixing to complete the connection of the two joint boxes (5); the hoisting of the plurality of joint boxes (5) is repeated until the joint boxes (5) are lowered to the designed height;
s4, backfilling the sandy soil bag (3): after the joint box (5) is hoisted, backfilling the sandy soil bag (3) in the space behind the joint box (5) to ensure that the sandy soil bag (3) is backfilled compactly, and meanwhile, extruding the joint box (5) to be tightly attached to the I-shaped steel (1) until the sandy soil bag (3) is filled above a pouring surface;
s5, hanging and pulling of the joint box (5): the hydraulic jacking machine (14) is hung at the joint box (5) on the notch, the joint box (5) penetrates through a slotted hole in the middle of the hydraulic jacking machine (14), the height of the jack is adjusted, a round hole of a cross bar at the top of the jack is aligned to a first connecting hole (7) of a connecting plate (6) of the joint box (5), and the joint box (5) can be hung and pulled through connection and fixation of a cylindrical steel bolt; after the concrete is poured and initially set, the joint box (5) needs to be lifted by a hydraulic jacking machine (14) and lifted once every 30min, wherein the lifting is 50-100 mm each time, so that the joint box (5) cannot be pulled out due to the concrete condensation is prevented; after the concrete is initially set for 4 hours, the joint box (5) is loosened through the hydraulic jacking machine (14), the hydraulic jacking machine (14) is removed, and the joint box (5) is completely pulled out by the crane (13).
8. The construction method of the underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 7, characterized in that: in the step S3, after the joint box (5) is lowered to the designed height, the joint box (5) is pressed into the soil layer of the groove bottom by 30-50cm through a press machine; the top of the joint box (5) is higher than the notch by more than 2 m.
9. The construction method of the underground diaphragm wall anti-streaming structure under the condition of the medium-thickness sand layer according to claim 7, characterized in that: in the step S4, the sand bag (3) is backfilled in a small quantity continuous backfilling mode, and after the sand bag (3) is backfilled for 5m each time, the sand bag (3) is hammered by a heavy hammer, so that the sand bag (3) is backfilled densely.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110527798.5A CN113216152A (en) | 2021-05-14 | 2021-05-14 | Underground diaphragm wall anti-streaming structure under medium-thickness sand layer condition and construction method thereof |
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| CN202110527798.5A CN113216152A (en) | 2021-05-14 | 2021-05-14 | Underground diaphragm wall anti-streaming structure under medium-thickness sand layer condition and construction method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11310918A (en) * | 1998-04-30 | 1999-11-09 | Shimizu Corp | Joint structure of underground continuous wall |
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2021
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| CN211646489U (en) * | 2019-12-04 | 2020-10-09 | 中国电建市政建设集团有限公司 | Underground continuous wall concrete is prevented around flowing and is used joint box |
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