CN115288146A - Supporting structure and construction method of pit continuous waterproof wall - Google Patents
Supporting structure and construction method of pit continuous waterproof wall Download PDFInfo
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- CN115288146A CN115288146A CN202210026230.XA CN202210026230A CN115288146A CN 115288146 A CN115288146 A CN 115288146A CN 202210026230 A CN202210026230 A CN 202210026230A CN 115288146 A CN115288146 A CN 115288146A
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000005192 partition Methods 0.000 claims abstract description 130
- 239000002689 soil Substances 0.000 claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 210000001503 joint Anatomy 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims 5
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 239000004567 concrete Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000002912 waste gas Substances 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0283—Retaining or protecting walls characterised by constructional features of mixed type
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- General Engineering & Computer Science (AREA)
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- Hydrology & Water Resources (AREA)
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Abstract
The invention relates to a supporting structure of a pit continuous waterproof wall, which comprises a soil-retaining and water-retaining double composite cement soil wall structure with a built-in precast slab, integrated supporting columns cast on the inner sides of the cement soil wall in situ and a prefabricated inner partition wall transversely connected between the opposite supporting columns; vertical grooves are formed in the end part of the prefabricated inner partition wall and the surface of the support column, when the end part of the prefabricated inner partition wall is connected with the surface of the support column, two grooves form a pair column hole, and a cast-in-place tenon column is formed by grouting in the pair column hole; and grouting pipes are embedded in the prefabricated inner partition walls and fill the connecting surfaces between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall through grouting. The cast-in-place support column is arranged on the inner side of the soil-blocking and water-retaining double composite cement soil wall structure, the prefabricated inner partition wall is connected between the opposite support columns, the prefabricated inner partition wall transversely supports the support columns, the support columns are attached to the cement soil wall, and the prefabricated plates are arranged in the cement soil wall, so that the support of the pit continuous waterproof wall is completed, the inner partition wall adopts a prefabricated structure, the time for cast-in-place and solidification is saved, the construction time is shortened, and the engineering progress is improved.
Description
Technical Field
The invention belongs to the field of pit construction, and particularly relates to a pit continuous waterproof wall supporting structure and a pit continuous waterproof wall construction method.
Background
The construction of civil engineering can not leave the development of foundation ditch engineering, especially the high-rise building in city, foundation ditch engineering's importance and security seem more outstanding, in foundation ditch engineering, interim enclosure such as stock in the past, the concrete shotcrete, drilling bored concrete pile etc. after the project completion, can be abandoned inside the soil body, cause very big wasting of resources, and the extension to future follow-up engineering causes the difficulty, the main reason is that these interim supports demolish the difficulty, influence the construction progress, interim enclosure expense is high and difficult the pull-out, consequently more need an energy-conservation, green and economic novel system of strutting.
Considering that the excavation depth of the foundation pit is deeper and deeper due to extremely limited land resources in urban dense areas, the existing subway stations, a large number of municipal pipelines buried underground and structures close to the foundation pit are arranged in the cities, and the foundation pit supporting means in the part of areas mostly adopt a combined supporting mode of an ultra-deep underground continuous wall and an inner support. However, with the development of the green low-carbon concept, the underground continuous wall has some problems: 1. a large amount of slurry protecting walls are needed in the process of forming the groove, the waste gas and slurry are difficult to discharge, and a large environmental protection pressure is formed; 2. the site construction process is complex, and the construction time is long; 3. the wall forming construction process has certain disturbance on the adjacent foundation, and the longer the groove forming time is, the deeper the wall body is, the larger the wall thickness is, and the greater the difficulty of environmental protection is; 4. the quality control of the underwater poured concrete is difficult, and the hidden trouble of seam water leakage is easily formed due to improper treatment. Therefore, designers propose a structure of a cemented soil continuous wall to form a continuous waterproof wall. However, the cement-soil continuous wall has a weak capability of resisting lateral soil pressure, a continuous wall needs to be constructed on the inner side of the continuous waterproof wall to serve as a retaining wall, a lining wall is constructed on the inner side of the continuous wall, and an inner partition wall is manufactured in a pit to support the continuous wall. Meanwhile, a gap is reserved between the diaphragm wall on the inner side of the waterproof wall and the waterproof wall, so that the reverse waterproof wall is lack of sufficient transverse support, the waterproof wall cannot bear lateral soil pressure, the phenomena of inclination and cracks occur, and the waterproof effect of the waterproof wall is reduced.
Disclosure of Invention
The invention provides a supporting structure of a deep pit continuous waterproof wall and a construction method, wherein a prefabricated wall plate is placed in a cement soil wall to form a soil retaining and water retaining structure, an integrated supporting column is cast in situ at a connecting part corresponding to the prefabricated wall plate on the inner side of the cement soil wall, a prefabricated inner partition wall is placed in a deep pit to support an opposite supporting column, meanwhile, the inner partition wall adopts a top-down construction mode, a cast-in-situ tenon column is adopted between the inner partition wall and the supporting column, a grouting pipe is pre-buried in the inner partition wall, and the upper inner partition wall and the lower inner partition wall are connected in a closed mode through the grouting pipe, so that the supporting structure of the continuous waterproof wall is built, the whole engineering quantity is simplified, and the construction efficiency is improved.
The specific technical scheme of the invention is as follows: a pit continuous waterproof wall supporting structure comprises a soil-retaining and water-retaining double composite cement soil wall structure with a built-in precast slab, an integrated support column cast inside a cement soil wall in a cast-in-place mode and a precast inner partition wall transversely connected between the opposite support columns; vertical grooves are formed in the end part of the prefabricated inner partition wall and the surface of the support column, when the end part of the prefabricated inner partition wall is connected with the surface of the support column, two grooves form a matched column hole, and a cast-in-place tenon column is formed by grouting in the matched column hole; and grouting pipes are embedded in the prefabricated inner partition walls and fill the connecting surfaces between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall through grouting.
The cast-in-place support columns are arranged on the inner side of the soil-blocking and water-retaining double composite cement soil wall structure, the prefabricated inner partition wall is connected between the opposite support columns, the prefabricated inner partition wall transversely supports the support columns, the support columns are attached to the cement soil wall, prefabricated plates are arranged in the cement soil wall, and accordingly the support of the deep-pit continuous waterproof wall is completed, the inner partition wall is of a prefabricated structure, the time for cast-in-place and solidification is saved, the construction time is shortened, the engineering progress is improved, and the inner partition wall is prefabricated in a factory, and can be better prevented from being influenced by weather compared with cast-in-place.
Preferably, the steel bars extend out of the groove bottom in the groove on the surface of the support column, the length of the steel bars is smaller than the depth of the groove, the steel bars extend out of the groove bottom in the groove at the end part of the prefabricated inner partition wall, and the length of the steel bars is smaller than the depth of the groove. The reinforcing steel bars extend out of the surfaces of the supporting columns, the end parts of the prefabricated inner partition walls extend out of the reinforcing steel bars, and the reinforcing steel bars are wrapped by concrete in the cast-in-place process of the tenon columns, so that the connection strength of the tenon columns is improved.
Preferably, the support column is square, and the width of the support column is larger than that of the connection part of the cement-soil wall; one side of the support column is a plane, the plane is fixedly connected with the inner side surface of the cement soil wall, and grooves are formed in the other three sides. The prefabricated plates in the cement soil wall are connected with each other, the width of the supporting column ensures that an enough lateral supporting surface is provided, the prefabricated connecting plates in the cement soil wall can be supported, the prefabricated wall plates in the cement soil wall can also be supported, and the soil retaining effect of the cement soil wall is more prominent.
Preferably, the upper side and the lower side of the prefabricated inner partition wall are provided with inward-concave filling grooves extending along the length of the prefabricated inner partition wall, the filling grooves are communicated with the grouting pipes, the opposite filling grooves of the upper prefabricated inner partition wall and the lower prefabricated inner partition wall are butted, and the connecting beams of the upper prefabricated inner partition wall and the lower prefabricated inner partition wall are formed in the filling grooves after grouting. Due to the existence of the filling grooves on the lower side of the prefabricated inner partition wall, mortar can be filled between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall after the prefabricated inner partition wall is installed, and the upper prefabricated inner partition wall and the lower prefabricated inner partition wall are connected.
Preferably, the prefabricated inner partition wall is internally provided with connecting screw pipes for connecting lifting hooks, screw openings of the connecting screw pipes face the side faces of the prefabricated inner partition wall, the number of the connecting screw pipes is at least four, the screw openings are evenly distributed on two side faces of the prefabricated inner partition wall, and the end parts of the connecting screw pipes are flush with the side faces of the prefabricated inner partition wall. The connection screw pipe is connected with the lifting hook in a threaded mode, and the prefabricated inner partition wall can be suspended through the lifting hook, so that the installation is convenient.
Preferably, the prefabricated slab comprises prefabricated wallboards and prefabricated connecting plates for connecting the prefabricated wallboards, the length of each prefabricated wallboard is matched with the distance between the prefabricated inner partition walls, and the positions of the prefabricated connecting plates correspond to the positions of the inner partition walls; the prefabricated wallboard is connected with the prefabricated connecting plate in a tongue-and-groove fastening mode, and the height of the prefabricated connecting plate is larger than that of the prefabricated wallboard.
Preferably, the vertical edges on the two sides of the prefabricated wall board adopt a tenon structure, bayonets are arranged on the two sides of the root of the tenon, the two vertical edges of the prefabricated connecting board adopt C-shaped grooves matched with the tenon structure, the notches of the C-shaped grooves extend towards the middle to form buckling edges, and the buckling edges are matched with the bayonets.
Preferably, the lower side surface of the prefabricated wall board is provided with protruding pins, the upper side surface of the prefabricated wall board is provided with concave slots, the shapes of the pins are matched with those of the slots, and the positions of the pins and the slots are in one-to-one vertical correspondence.
A construction method of a pit continuous waterproof wall supporting structure comprises the following steps: firstly, constructing a cement soil wall, wherein a prefabricated plate is inserted into a groove in the groove milling process of a groove milling machine, and constructing a soil-retaining and water-retaining double composite cement soil wall structure;
secondly, casting reinforced concrete support columns on the inner side of the cement-soil wall in situ;
thirdly, excavating earth to a set elevation, then placing the prefabricated internal partition wall, butting the end part of the prefabricated internal partition wall with the surface of the corresponding support pillar, and then grouting the involutory pillar hole between the support pillar and the end part of the prefabricated internal partition wall to form a cast-in-situ tenon pillar;
fourthly, continuing to excavate the earth to a set elevation, then prefabricating an inner partition wall below to enable the end part of the prefabricated inner partition wall to be in butt joint with the surface of the corresponding support column, aligning the upper prefabricated inner partition wall and the lower prefabricated inner partition wall to the same vertical plane, then grouting into the hole of the butt joint column to form a cast-in-situ tenon column, and grouting through a grouting pipe of the prefabricated inner partition wall to fill the position between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall;
and fifthly, repeating the fourth step until the earthwork is excavated to the elevation of the substrate, and finishing the installation of the last prefabricated inner partition wall.
The earthwork is excavated from top to bottom, the prefabricated inner partition wall is arranged from top to bottom, and the earthwork is excavated to form a layer, namely, the prefabricated inner partition wall is arranged, so that the support column does not have the support of the earthwork, but can be used for supporting through the prefabricated inner partition wall, and the safety of the earthwork is not influenced.
Preferably, when the reinforced concrete support column is cast in situ, the three outer side surfaces of the reinforcement cage are wrapped by the trapezoidal support plates, the support plates are provided with through holes, and the reinforcing steel bars extending out of the side surfaces of the support column penetrate through the through holes.
The invention has the beneficial effects that: the cast-in-place support column is arranged on the inner side of the soil-blocking and water-retaining double composite cement soil wall structure, the prefabricated inner partition wall is connected between the opposite support columns, the prefabricated inner partition wall transversely supports the support columns, the support columns are attached to the cement soil wall, and the prefabricated plates are arranged in the cement soil wall, so that the support of the pit continuous waterproof wall is completed, the inner partition wall adopts a prefabricated structure, the time for cast-in-place and solidification is saved, the construction time is shortened, and the engineering progress is improved.
Drawings
FIG. 1 is a schematic view of one embodiment of the present invention;
FIG. 2 is an enlarged schematic view at I of the structure of FIG. 1 according to the present invention;
FIG. 3 is a side elevational schematic view of the present invention;
FIG. 4 is a side cross-sectional view of the present invention;
FIG. 5 is a schematic end view of a prefabricated interior partition wall of the present invention;
FIG. 6 is a schematic view of a support post according to the present invention;
FIG. 7 is a schematic view illustrating a connection structure of prefabricated panels of a cement wall according to the present invention;
in the figure: 1. cement-soil wall, 2 prefabricated plate, 3 prefabricated connecting plate, 4 support column, 5 tenon column, 6 prefabricated internal partition wall, 7 reinforcement, 8 connecting screw pipe, 9 grouting pipe, 10 groove, 11 filling groove, 12 prefabricated wall plate, 13 slot, 14 tenon, 15C-shaped groove, 16 plug pin.
Detailed Description
The invention is further described by the following specific embodiments in conjunction with the accompanying drawings.
Example (b):
as shown in fig. 1, fig. 2, fig. 3 and fig. 4, the support structure for the continuous waterproof wall in the pit comprises a soil-retaining and water-retaining dual composite cement-soil wall 1 structure with built-in precast slabs 2, cast-in-place integrated supporting columns 4 on the inner side of the cement-soil wall, and precast inner partition walls 6 transversely connected between the opposite supporting columns.
The whole pit is rectangular, four sides and four corners, the positions of the sides are planar, and a cross structure is formed at the positions of the corners. The cement soil wall adopts prefabricated wallboard and prefabricated connecting plate to adopt the mode of tongue-and-groove lock joint to connect in the position that corresponds the limit, and the position that corresponds the angle adopts prefabricated cross wallboard and prefabricated connecting plate to adopt the mode of tongue-and-groove lock joint to connect, and prefabricated connecting plate is connected with prefabricated wallboard. The length of prefabricated wallboard is identical with the distance between the prefabricated interior partition wall, and the position of prefabricated connecting plate corresponds with the position of interior partition wall, and the height of prefabricated connecting plate is greater than the height of prefabricated wallboard.
As shown in FIG. 7, the prefabricated wall panel 12 is planar, the cross section of the prefabricated cross wall panel is cross-shaped, the vertical edges of the two sides of the prefabricated wall panel adopt a tenon 14 structure, and the two adjacent vertical edges of the prefabricated cross wall panel adopt a tenon structure. The vertical terminal surface of tenon has the rake and makes the width of the both sides face of tenon different, promptly, and the width of the side of orientation in the pit is less than the width of the side of opposite side, and the both sides position of the root of tenon sets up the bayonet socket. The two vertical edges of the prefabricated connecting plate adopt C-shaped grooves 15 matched with the tenon structures, the notches of the C-shaped grooves extend towards the middle to form buckling edges, the buckling edges are matched with the bayonets, and the bayonets can prevent the C-shaped grooves from transversely separating. The middle of the prefabricated connecting plate is an inner plate, and two side faces of the inner plate are in a shape matched with the vertical end face of the tenon. The tenon extends along the vertical edge of the prefabricated plate, the C-shaped groove is arranged along the vertical edge of the prefabricated connecting plate, the prefabricated plate is also arranged in a vertical mode when being arranged, and the prefabricated connecting plate can be vertically inserted into the C-shaped groove and the tenon to be connected. The height of the prefabricated wall boards and the height of the prefabricated cross wall boards are 2.7-3m, the height of the prefabricated wall boards generally corresponds to the height of one layer of a pit building, and the height of the prefabricated connecting boards is larger than that of the prefabricated wall boards, so that the prefabricated connecting boards can be used for connecting at least two prefabricated wall boards. The thickness of tenon is less than the thickness of prefabricated wall plate, and after prefabricated connecting plate and prefabricated wallboard pegged graft, the outside surface parallel and level of prefabricated plate, the inboard surface parallel and level of prefabricated plate also make the soil cement layer of prefabricated plate outward appearance have sufficient thickness like this. The prefabricated wall board is of a stacked inserting structure from top to bottom, protruding plug pins 16 are arranged on the lower side surface of the prefabricated wall board, concave inserting grooves 13 are formed in the upper side surface of the prefabricated wall board, the shapes of the plug pins are matched with those of the inserting grooves, and the positions of the plug pins and the positions of the inserting grooves are in one-to-one vertical correspondence. The lower side surface of the prefabricated cross wall plate is provided with protruding pins, the upper side surface of the prefabricated cross wall plate is provided with concave slots, the shapes of the pins are matched with those of the slots, and the positions of the pins and the slots are in one-to-one vertical correspondence. When the prefabricated wall panel is placed, the pin is inserted into the slot when the prefabricated cross wall panel is placed, and the upper prefabricated plate and the lower prefabricated plate establish a stable splicing structure. The cross section of the pin is divided into two parts, including a rectangular part and a trapezoidal part, and the length of the short side of the trapezoidal part is equal to that of the rectangular part. The inclined plane of trapezoidal portion is equivalent to the guide structure who participates in, can guide to participate in smoothly with the slot cooperation.
As shown in fig. 6, the supporting column is square, the width of the supporting column is greater than that of the prefabricated connecting plate, one side surface of the supporting column is a plane, the plane is fixedly connected with the inner side surface of the cement-soil wall, and trapezoidal grooves 10 are formed in the other three side surfaces. And reinforcing steel bars 7 extend out of the groove bottom in the grooves on the surfaces of the supporting columns, the length of the reinforcing steel bars is smaller than the depth of the grooves, the reinforcing steel bars extend out of the groove bottom in the grooves at the end parts of the prefabricated inner partition walls, and the length of the reinforcing steel bars is smaller than the depth of the grooves. The end part of the prefabricated inner partition wall is provided with a vertical groove, when the end part of the prefabricated inner partition wall is connected with the surface of a support column, the two grooves form a closing column hole, and a cast-in-situ tenon column 5 is formed by grouting in the closing column hole.
As shown in fig. 4 and 5, a grouting pipe 9 is pre-buried in the prefabricated inner partition wall, the upper side and the lower side of the prefabricated inner partition wall are provided with inward-recessed filling grooves 11 extending along the length of the prefabricated inner partition wall, the filling grooves are communicated with the grouting pipe, the opposite filling grooves of the upper prefabricated inner partition wall and the lower prefabricated inner partition wall are butted, and a connecting beam of the upper prefabricated inner partition wall and the lower prefabricated inner partition wall is formed in the filling grooves after grouting. Be provided with in the prefabricated interior partition wall and be used for connecting the connecting solenoid 8 of lifting hook, the screw opening of connecting the solenoid is towards the side of prefabricated interior partition wall, and connecting the solenoid is four at least, and screw opening evenly divides on two sides of prefabricated interior partition wall, and the tip of connecting the solenoid is parallel and level mutually with the side of prefabricated interior partition wall. Considering the convenience of the cast-in-place of the support column, the end part of the prefabricated inner partition wall is provided with a notch, the notch is just communicated with the groove at the end part of the prefabricated inner partition wall, and the grouting can be performed in the hole of the involutory column through the notch.
A construction method of a pit continuous waterproof wall supporting structure comprises the following steps: firstly, constructing a cement soil wall, wherein during the groove milling process of a groove milling machine, prefabricated plates are inserted into a groove, prefabricated cross wall plates are inserted into corner positions, prefabricated wall plates are inserted into side positions, and the prefabricated wall plates are connected through prefabricated connecting plates to form a soil-retaining and water-retaining double composite cement soil wall structure;
secondly, casting a reinforced concrete support column on the inner side of the cement-soil wall in situ, digging soil to form a deep hole before casting the support column, then covering a trapezoidal support plate on three outer side surfaces of a reinforcement cage, arranging a through hole on the support plate, enabling a reinforcement extending out of the side surface of the support column to pass through the through hole, and pouring concrete mortar from top to bottom after the reinforcement cage is placed;
thirdly, excavating earth to a set elevation, then placing the prefabricated inner partition wall, butting the end part of the prefabricated inner partition wall with the surface of a corresponding support column, grouting a joint column hole between the support column and the end part of the prefabricated inner partition wall to form a cast-in-place tenon column, when the inner partition wall is prefabricated below, screwing a lifting hook into a connecting screw pipe, putting down the prefabricated inner partition wall from the side surface of the installed prefabricated inner partition wall, and transversely moving the prefabricated inner partition wall until the prefabricated inner partition wall is connected with the support column; the transverse movement can be realized in a way of placing a rail at the bottom, and can also be realized in a way of increasing a lifting hook to suspend the other side of the installed prefabricated inner partition wall;
fourthly, continuously excavating the earth to a set elevation, then continuously prefabricating an inner partition wall below, enabling the end part of the prefabricated inner partition wall to be in butt joint with the surface of a corresponding support column, aligning the upper prefabricated inner partition wall and the lower prefabricated inner partition wall to the same vertical plane, then grouting into the hole of the butt joint column to form a cast-in-situ tenon column, and grouting through a grouting pipe of the prefabricated inner partition wall to fill the position between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall;
and fifthly, repeating the fourth step until the earth is excavated to the elevation of the substrate, and finishing the installation of the last prefabricated inner partition wall.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modifications, alterations and equivalent changes made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A pit continuous waterproof wall supporting structure is characterized by comprising a soil-retaining and water-retaining double composite cement soil wall structure with a built-in precast slab, integrated supporting columns cast on the inner sides of the cement soil wall in a cast-in-place mode, and a precast inner partition wall transversely connected between the opposite supporting columns; vertical grooves are formed in the end part of the prefabricated inner partition wall and the surface of the support column, when the end part of the prefabricated inner partition wall is connected with the surface of the support column, two grooves form a pair column hole, and a cast-in-place tenon column is formed by grouting in the pair column hole; and grouting pipes are pre-embedded in the prefabricated inner partition walls and the connecting surfaces between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall are filled by grouting.
2. The support structure for a diaphragm waterproof wall in a pit according to claim 1, wherein the reinforcing bars are extended from the bottom of the groove in the surface of the support column, the length of the reinforcing bars is smaller than the depth of the groove, the reinforcing bars are extended from the bottom of the groove in the groove at the end of the prefabricated inner partition wall, and the length of the reinforcing bars is smaller than the depth of the groove.
3. The pit continuous waterproof wall supporting structure according to claim 1 or 2, wherein the supporting columns are square, and the width of each supporting column is larger than that of a cement-soil wall connecting part; one side of the support column is a plane, the plane is fixedly connected with the inner side surface of the cement soil wall, and grooves are formed in the other three sides.
4. The support structure for the continuous waterproof wall of the pit according to claim 1, wherein the upper and lower sides of the prefabricated inner partition wall are provided with inward filling grooves extending along the length of the prefabricated inner partition wall, the filling grooves are communicated with grouting pipes, the opposite filling grooves of the upper and lower prefabricated inner partition walls are butted, and connecting beams of the upper and lower prefabricated inner partition walls are formed in the filling grooves after grouting.
5. The support structure for the continuous waterproof wall of the pit according to claim 1, 2 or 4, wherein the prefabricated inner partition wall is internally provided with connecting screw pipes for connecting the lifting hooks, screw hole openings of the connecting screw pipes face to the side face of the prefabricated inner partition wall, the number of the connecting screw pipes is at least four, the screw hole openings are evenly distributed on two side faces of the prefabricated inner partition wall, and the end parts of the connecting screw pipes are flush with the side faces of the prefabricated inner partition wall.
6. The support structure of a deep pit continuous waterproof wall according to claim 1, 2 or 4, wherein the prefabricated panels comprise prefabricated wall panels and prefabricated connecting plates for connecting the prefabricated wall panels, the length of the prefabricated wall panels is matched with the distance between the prefabricated inner partition walls, and the positions of the prefabricated connecting plates correspond to the positions of the inner partition walls; the prefabricated wallboard is connected with the prefabricated connecting plate in a tongue-and-groove fastening mode, and the height of the prefabricated connecting plate is larger than that of the prefabricated wallboard.
7. The support structure for the continuous waterproof wall in the pit as claimed in claim 6, wherein the vertical edges of the prefabricated wall boards are in tenon structures, the bayonets are arranged at the two sides of the root parts of the tenons, the vertical edges of the prefabricated connecting boards are in C-shaped grooves matched with the tenon structures, the notches of the C-shaped grooves extend towards the middle to form buckling edges, and the buckling edges are matched with the bayonets.
8. The support structure for the continuous waterproof wall in a pit according to claim 6, wherein the lower surface of the prefabricated wall panel is provided with protruding pins, the upper surface of the prefabricated wall panel is provided with concave slots, the shape of the pins is matched with that of the slots, and the positions of the pins and the slots are in one-to-one vertical correspondence.
9. A method for constructing a pit continuous waterproof wall supporting structure according to any one of claims 1 to 8, comprising the steps of: firstly, constructing a cement soil wall, wherein a prefabricated plate is inserted into a groove in the groove milling process of a groove milling machine, and constructing a soil-retaining and water-retaining double composite cement soil wall structure;
secondly, casting reinforced concrete support columns on the inner side of the cement-soil wall in situ;
thirdly, excavating earth to a set elevation, then placing a prefabricated inner partition wall, butting the end part of the prefabricated inner partition wall with the surface of a corresponding supporting column, and then grouting in a matched column hole between the supporting column and the end part of the prefabricated inner partition wall to form a cast-in-situ tenon column;
fourthly, continuing to excavate the earth to a set elevation, then prefabricating an inner partition wall below to enable the end part of the prefabricated inner partition wall to be in butt joint with the surface of the corresponding support column, aligning the upper prefabricated inner partition wall and the lower prefabricated inner partition wall to the same vertical plane, then grouting into the hole of the butt joint column to form a cast-in-situ tenon column, and grouting through a grouting pipe of the prefabricated inner partition wall to fill the position between the upper prefabricated inner partition wall and the lower prefabricated inner partition wall;
and fifthly, repeating the fourth step until the earthwork is excavated to the elevation of the substrate, and finishing the installation of the last prefabricated inner partition wall.
10. The construction method according to claim 9, wherein when the reinforced concrete support column is cast in place, three outer sides of the reinforcement cage are covered with trapezoidal support plates, through holes are formed in the support plates, and the reinforcing bars protruding from the sides of the support column pass through the through holes.
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| JPH09158473A (en) * | 1995-12-08 | 1997-06-17 | Taisei Corp | Construction method for concrete structure |
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| JPH09158473A (en) * | 1995-12-08 | 1997-06-17 | Taisei Corp | Construction method for concrete structure |
| CN103321231A (en) * | 2013-06-10 | 2013-09-25 | 叶长青 | Construction method of foundation pit support |
| CN210797533U (en) * | 2019-07-16 | 2020-06-19 | 武汉谦诚桩工科技股份有限公司 | Assembled prestressing force underground continuous wall structure |
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