CN113123362A - Design and construction method for side wall with fabricated underground diaphragm wall serving as main structure - Google Patents
Design and construction method for side wall with fabricated underground diaphragm wall serving as main structure Download PDFInfo
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- CN113123362A CN113123362A CN202110404762.8A CN202110404762A CN113123362A CN 113123362 A CN113123362 A CN 113123362A CN 202110404762 A CN202110404762 A CN 202110404762A CN 113123362 A CN113123362 A CN 113123362A
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- 238000010276 construction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 163
- 239000010959 steel Substances 0.000 claims description 163
- 239000004567 concrete Substances 0.000 claims description 23
- 239000002689 soil Substances 0.000 claims description 22
- 238000004873 anchoring Methods 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims 2
- 210000001503 joint Anatomy 0.000 description 9
- 238000005253 cladding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
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- 238000009434 installation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention discloses a design and construction method of an assembled underground continuous wall serving as a main structure side wall, which comprises a prefabricated upper side wall and a prefabricated lower side wall, wherein embedded sleeves are arranged in the upper side wall and the lower side wall respectively, each embedded sleeve comprises a positioning sleeve and an embedded grouting pipe, the upper side wall and the lower side wall are fixedly connected through a vertical connecting node to form the prefabricated side wall, the embedded sleeves of the upper side wall are communicated with the embedded sleeves of the lower side wall, the prefabricated side wall is provided with a plurality of connecting notches, and the prefabricated side wall is connected with a main board structure through the connecting notches. The invention designs a structure and a method for using a fabricated underground station continuous wall as a side wall, the structure can realize accurate positioning, ensure that the perpendicularity and the deflection degree of the wall body meet the engineering requirements, has higher adaptability to the stratum, and can adapt to most geological environments.
Description
Technical Field
The invention relates to the technical field of underground station engineering construction, in particular to a side wall design and construction method of an assembled underground continuous wall serving as a main structure.
Background
In the prior art, the side walls of underground structures such as subway stations and the like are generally of two structures, one is a composite wall structure, and the side walls are generally of parallel structures of underground continuous walls, molded concrete side walls or fender piles and molded concrete side walls; the other type is an integral wall structure, however, the integral wall is difficult to sink to a designed elevation due to a large friction coefficient with a soil body, has high requirements for geological conditions, poor stratum adaptability and large volume, is difficult to position by adopting mechanical equipment, has large deflection error and is difficult to meet engineering positioning requirements.
The above disadvantages need to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a design and construction method of a side wall with an assembled underground continuous wall serving as a main structure.
The technical scheme of the invention is as follows:
the utility model provides an assembled underground continuous wall does major structure side wall design concurrently, includes prefabricated last side wall and downside wall, go up the side wall with all be provided with buried sleeve in the downside wall, buried sleeve includes position sleeve and pre-buried slip casting pipe, go up the side wall with the side wall passes through vertical connected node fixed connection down and forms prefabricated side wall, go up the buried sleeve of side wall with the buried sleeve intercommunication of side wall down, prefabricated side wall sets up a plurality of connection notches, prefabricated side wall passes through connect notch and mainboard structural connection.
The assembled underground continuous wall is designed to be a main structure side wall, the embedded sleeves vertically penetrate through the upper side wall and the lower side wall, and the positioning steel pipes are anchored in the grooves of the underground continuous wall, and the positioning sleeves are connected with the positioning steel pipes, so that the upper side wall and the lower side wall sink along the positioning steel pipes.
The design of foretell assembled underground continuous wall is done main structure side wall concurrently, vertical connected node includes connecting plate, connection shaped steel and concrete placement body, connecting plate connects respectively go up the bottom of side wall with the top of lower side wall forms confined surrounding structure, connection shaped steel sets up respectively go up the bottom of side wall with the top and mutual fixed connection of lower side wall, go up the side wall down the side wall reaches the inside concrete placement that fills in space that connecting plate surrounded forms the concrete placement body.
Furthermore, a connecting batten plate is erected between the connecting section steels and is respectively connected with the connecting section steels on the upper side and the lower side through connecting bolts.
Furthermore, the bottom of the upper side wall and the top of the lower side wall are both provided with connecting angle steel, and the connecting steel plates are fixedly connected with the connecting angle steel on the upper side and the lower side respectively.
Furthermore, an L-shaped blanking pipe is arranged at the lower part of the upper side wall.
The assembled underground continuous wall is designed to be a side wall of a main structure, the upper side wall is provided with a plurality of middle plate preformed grooves, the lower side wall is provided with a bottom plate preformed groove, and the middle plate preformed grooves and the bottom plate preformed grooves are both internally provided with channel steel and are provided with fillers.
The assembled underground continuous wall also serves as the side wall of the main structure, the upper side wall comprises a first rectangular section and a second rectangular section, the longitudinal sections of the first rectangular section and the second rectangular section are rectangular, and the thickness of the first rectangular section is smaller than that of the second rectangular section;
the lower side wall comprises a third rectangular section and a trapezoidal section, the longitudinal section of the third rectangular section is rectangular, and the longitudinal section of the trapezoidal section is in an inverted isosceles trapezoid shape;
the thickness of the third rectangular section is the same as the thickness of the second rectangular section.
Foretell assembled underground continuous wall does major structure side wall design concurrently, through wall connection node fixed connection between the prefabricated side wall, wall connection node includes a plurality of spouts soon stake and is connected the body of casting, it sets up to spout soon the stake both sides of prefabricated side wall junction, set up the steel reinforcement cage between the prefabricated side wall, the steel reinforcement cage is pour and is formed the connection is cast the body.
Foretell assembled underground continuous wall does major structure side wall design concurrently, the bottom of lower side wall is provided with the steel shoe board, fixed a plurality of hoisting structure on the steel shoe board, hoisting structure includes rings and lifting hook.
Foretell assembled underground continuous wall does major structure side wall design concurrently, underground continuous wall tip sets up the prefabricated side wall group of a plurality of groups, prefabricated side wall group includes two wedge wall width of cloth that set up opposite direction, the wedge wall width of cloth is right trapezoid.
A construction method for designing a side wall with an assembled underground continuous wall serving as a main structure comprises the following construction steps:
s1, arranging guide wall platforms at two ends of an underground continuous wall groove, excavating the underground continuous wall groove, and backfilling silt soft soil after the groove is formed;
s2, installing a positioning steel pipe, and grouting the bottom of the positioning steel pipe for anchoring;
s3, installing hoisting equipment, moving the lower side wall to a notch of the underground continuous wall, butting the lower side wall with the positioning steel pipe, controlling the lower side wall to sink through a pulley block and a steel wire rope, and fixing the lower side wall on the guide wall platform after the lower side wall sinks to a set depth;
s4, transporting an upper side wall to the position above the lower side wall and butting the upper side wall with the positioning steel pipe, and arranging a vertical connecting node between the upper side wall and the lower side wall to connect the upper side wall and the lower side wall to form a prefabricated side wall;
s5, removing a fixed structure of the lower side wall, operating the prefabricated side wall to hoist and sink to a designed elevation through the steel wire rope and the pulley block, and fixing the position of the prefabricated side wall;
s6, grouting is conducted on the pre-buried grouting pipe inside the prefabricated side wall and the positioning steel pipe, and soft silt soil in the underground continuous wall groove is replaced;
s7, cutting off redundant positioning steel pipes and steel wire ropes, plugging the positioning steel pipes and the embedded grouting pipes, and completing the construction of the side wall;
s8, repeating the steps S1-S7, and continuing the construction of the subsequent wall panels so as to finish the construction of the underground continuous wall;
and S9, performing seam treatment between the prefabricated side walls.
In the construction method for designing the side wall with the fabricated underground continuous wall serving as the main structure, in step S2, the sleeve valve steel pipes are arranged to extend to the lower side of the positioning steel pipes, and soil around the anchoring points is anchored by grouting through the sleeve valve steel pipes.
In the construction method for designing the side wall with the fabricated underground continuous wall serving as the main structure, in the steps S3 and S5, reaction frames and jacks are respectively arranged on the two sides and the top of the prefabricated side wall to assist in sinking, the jacks comprise vertical jacks and horizontal jacks, the vertical jacks assist in sinking, and the horizontal jacks assist in deviation rectification.
In the construction method for designing the side wall with the assembly type underground continuous wall serving as the main structure, in-situ molding prefabrication of the upper side wall and the lower side wall is completed before step S3, the upper side wall is provided with the middle plate preformed groove, and the lower side wall is provided with the bottom plate preformed groove.
In the above construction method for designing the side wall with the fabricated underground diaphragm wall also serving as the main structure, step S9 includes
A1, arranging a plurality of rotary spraying piles on two sides of a joint between the prefabricated side walls, wherein the bottoms of the rotary spraying piles are flush with the bottom of the lower side wall;
step A2, flushing the joints between the prefabricated side walls by adopting a water drilling method, then pumping away slurry, and pouring concrete to a position 1 m below the bottom plate;
step A3, cleaning the wall bodies in the underground continuous wall groove, and arranging primary and secondary steel plates between the prefabricated side walls for lock catch connection;
and step A4, chiseling the wall surfaces of the prefabricated side walls, and hoisting a reinforcement cage and pouring concrete through a grouting pipe between the prefabricated side walls.
In the construction method for designing the side wall doubling as the main structure of the fabricated underground continuous wall, in step S8, after the first prefabricated side wall arranged at the end of the underground continuous wall is completed, when the construction of the second prefabricated side wall is performed according to steps S1-S7, the second prefabricated side wall is lowered to the bottom of the underground continuous wall groove from top to bottom along the edge of the first prefabricated side wall.
The invention according to the above scheme has the advantages that,
1. the upper side wall and the lower side wall are prefabricated by in-situ molding, and the manufacturing is finished on a construction site, so that the transportation cost is saved.
2. The method has the advantages that the silt soft soil is used for backfilling after the underground continuous wall is grooved, so that holes can not collapse in the grooves, the geological condition suitable for the sinking of the prefabricated side wall is artificially created, the side friction between the prefabricated side wall and the soil body is reduced, the side wall sinks uniformly, and meanwhile, the geological application range of the method can be expanded.
3. The upper side wall and the lower side wall are both provided with positioning sleeves, the sinking positions and the verticality of the upper side wall and the lower side wall can be accurately positioned through the butt joint of the positioning sleeves and positioning steel pipes in the grooves of the underground diaphragm wall, and the bottom soil body of the positioning steel pipes is subjected to grouting anchoring by adopting sleeve valve steel pipes, so that the verticality of the positioning steel pipes is ensured, and the prefabricated side wall formed by the upper side wall and the lower side wall can be accurately positioned.
4. The bottom of the prefabricated side wall is provided with a blade steel shoe plate for controlling sinking, and meanwhile, the bottom of the side wall can be protected.
5. The upper side wall and the lower side wall are provided with embedded grouting pipes, after the prefabricated side wall is sunk to the set elevation, grouting is conducted to the inside of the underground continuous wall groove through the embedded grouting pipes, the backfilled sludge soft soil is replaced out and the prefabricated side wall is reinforced, the prefabricated side wall is guaranteed not to generate excessive settlement after being sunk to the designed elevation, gaps between the outer side of the prefabricated side wall and the back soil body can be filled, and the prefabricated side wall is further reinforced.
6. The prefabricated side wall is divided into an upper side wall and a lower side wall, so that the height of the template trolley for transportation can be reduced, and the requirement on using equipment is lowered.
7. The side wall includes the rectangle section of two sections different thickness and is provided with the medium plate and reserves the groove, and the side wall sets up the bottom plate and reserves the groove down for its fashioned prefabricated side wall reserves has the notch of being connected with roof, medium plate and bottom plate, fuses the function of underground continuous wall and main part side wall on all fusing the prefabricated side wall, shortens construction period, improves the engineering quality, and the notch is peripheral to use the channel-section steel protection, and inside packing foam guarantees that later stage engineering can be effectively connected with station semi-structure.
8. The two sides of the prefabricated side wall are provided with the reaction frames, when the self-sinking of the prefabricated side wall is blocked, the top of the prefabricated side wall can be assisted to sink by using the jack, the jack comprises a vertical jack and a horizontal jack, the vertical jack plays a role in assisting in sinking, the horizontal jack assists in rectifying deviation, and the prefabricated side wall in the sinking assisting process is guaranteed not to deviate.
9. The prefabricated side wall is lifted and suspended and sunk by using the pulley block and the steel wire rope, the prefabricated side wall is guaranteed to sink uniformly by adjusting the length and the tension of the steel wire rope, and sudden sinking and deflection of the prefabricated side wall are prevented.
10. The prefabricated side walls are provided with primary and secondary steel plates for lock catch connection, positioning of underground continuous wall grooves is achieved, the two sides of the joint between the prefabricated side walls are provided with anti-seepage walls, water is stopped through the jet grouting piles, the joint between the prefabricated side walls is washed through a water drilling method, and reinforced concrete is poured at the joint after the prefabricated side walls are drained and cleaned, so that the structural strength and the waterproof performance of the joint between the prefabricated side walls are guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of an upper side wall.
Fig. 2 is a schematic cross-sectional view of 1-1 in fig. 1.
Fig. 3 is a sectional structure view of the connection between the public gateway and the station main body.
Fig. 4 is a schematic structural view of the lower side wall.
Fig. 5 is a schematic cross-sectional view of 1-1 in fig. 4.
Fig. 6 is a schematic view of a connection structure of the upper side wall and the lower side wall.
Fig. 7 is a schematic view of a connection structure of the connection gusset plate and the connection section steel.
Fig. 8 is a schematic cross-sectional view of 1-1 in fig. 6.
Fig. 9 is a schematic view of a hoisting structure of the upper side wall.
Fig. 10 is a schematic structural view of a wedge-shaped wall web at the end of an underground diaphragm wall.
Fig. 11 is a schematic structural view of the guide wall platform and the underground continuous wall slot.
FIG. 12 is a schematic structural view of the positioning steel pipe and the anchoring body in the underground continuous wall groove.
Fig. 13 is a schematic structural view of hoisting the lower side wall.
FIG. 14 is a schematic view of the structure of the lower side wall reaching a set elevation.
FIG. 15 is a schematic structural view of the prefabricated side wall formed by connecting the upper side wall and the lower side wall during hoisting.
FIG. 16 is a schematic structural diagram of the prefabricated side wall sinking to the designed elevation.
Fig. 17 is a schematic structural view of a wall connection node between prefabricated side walls.
Wherein, in the figures, the respective reference numerals:
01. an upper sidewall; 011. a middle plate preformed groove; 012. a boss; 013. hoisting a steel plate; 014. main ribs are arranged inside; 015. L-shaped blanking pipe;
02. a lower sidewall; 021. a bottom plate preformed groove; 022. a steel shoe plate; 023. hoisting the structure;
03. a vertical connecting node; 031. connecting profile steel; 032. connecting the batten plate; 033. a connecting bolt; 034. pouring concrete; 035. connecting angle steel; 036. connecting steel plates;
04. connecting nodes on the wall; 041. pouring a reinforcement cage; 042. carrying out jet grouting pile;
05. prefabricating a side wall; 051. embedding a grouting pipe; 052. positioning the sleeve; 053. a wedge-shaped wall panel; 054. a middle side wall;
06. a top plate; 07. a middle plate;
08. an underground diaphragm wall groove; 081. positioning the steel pipe; 082. an anchor;
09. a wall guide platform;
10. hoisting equipment; 101. a pulley block; 102. a steel cord.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "fixed" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and should not be construed as limiting the technical solution. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
The utility model provides an assembled underground continuous wall does major structure side wall design concurrently, includes prefabricated last side wall 01 and lower side wall 02, goes up side wall 01 and lower side wall 02 and forms side wall concurrently underground continuous wall through vertical connected node 03 fixed connection.
As shown in fig. 1 and 2, the upper side wall 01 includes a first rectangular section and a second rectangular section, the longitudinal sections of the first rectangular section and the second rectangular section are rectangular, the thickness of the first rectangular section is smaller than that of the second rectangular section, and a boss 012 is formed on the upper portion of the upper side wall 01. The two sides of the second rectangular section are concave. A plurality of positioning sleeves 052 and pre-buried grouting pipes 051 penetrating up and down are arranged in the upper side wall 01, and the positioning sleeves 052 extend downwards to the outside of the upper side wall 01. Go up the bottom of side wall 01 and use angle connector 035 cladding to set up connection steel 031, angle connector 035 forms annular cladding around the last side wall round, connection steel 031 imbeds inside the side wall 01 and with inside arrangement of reinforcement fixed connection. The lower part of going up side wall 01 is provided with medium plate reservation groove 011, and the periphery of medium plate reservation groove 011 sets up the channel-section steel and protects, and packs the foam in the groove to be connected with station main wall structure. As shown in fig. 3, at the entrance and exit of the public area, the upper side wall 01 is connected with the top plate 06 and the middle plate 07 of the station main body, the top plate 06 abuts against and is fixed at the boss 012 where the sectional area of the upper side wall 01 changes suddenly, and the middle plate 07 is embedded into the middle plate reservation slot 011 and fixed.
As shown in fig. 4 and 5, the lower side wall 02 includes a third rectangular section and a trapezoidal section, the longitudinal section of the third rectangular section is rectangular, and the longitudinal section of the trapezoidal section is an inverted isosceles trapezoid. Both sides of the trapezoidal section are concave. A plurality of positioning sleeves 052 and pre-buried grouting pipes 051 penetrating up and down are arranged in the lower side wall 02, and the positioning sleeves 052 extend to the lower part of the lower side wall 02. Connecting angle steel 035 is used to the top of lower side wall 02 cladding to set up connecting steel 031, connecting angle steel 035 forms annular cladding around the last side wall round, connecting steel 031 imbeds inside the upper side wall 01 and with inside arrangement of reinforcement fixed connection. In the third rectangular section, a bottom plate reserved groove 021 which penetrates horizontally is arranged, the periphery of the groove opening is provided with channel steel protection, and the inside of the groove opening is filled with foam. The terminal surface of trapezoidal section both sides slope sets up steel shoe plate 022, fixes hoisting structure 023 on steel shoe plate 022.
In this application, the third rectangle section is the same with the thickness of the second rectangle section of upper sidewall 01, and the pre-buried slip casting 051 of upper sidewall 01 and lower sidewall 02 is unanimous with the position sleeve 052 model, and connection shaped steel 031 is H shaped steel.
As shown in fig. 6, 7 and 8, the upper side wall 01 and the lower side wall 02 are fixedly connected through vertical connecting nodes 03 to form a prefabricated side wall 05 which is also a underground continuous wall. Vertical connected node 03 includes connecting steel plate 036, connection shaped steel 031 and concrete casting 034. Connecting section steel 031 of upper sidewall 01 bottom aligns with connecting section steel 031 at lower side wall 02 top, erects between two connecting section steel 031 and connects batten plate 032, connects the connecting section steel 031 of both sides about connecting batten plate 032 passes through connecting bolt 033 and connects respectively. In this application, connect batten plate 032 and connect batten plate for the I-steel, be provided with a plurality of connecting bolt holes, connect batten plate 032 and set up respectively in the outside of connecting profiled steel 031, connect batten plate 032 through bolted connection two for connect batten plate 032 respectively with the connecting profiled steel 031 fixed connection of last side wall 01, lower side wall 02. The connecting steel plate 036 is welded with the angle steel of the upper side wall 01 and the lower side wall 02 respectively to form a closed surrounding structure consisting of the bottom of the upper side wall, the top of the lower side wall and the connecting steel plate 036. The built-in main ribs of the upper side wall 01 and the lower side wall 02 extend out of the surface of the wall body and are fixedly connected with each other, so that the connection strength between the upper side wall 01 and the lower side wall 02 is enhanced. The lower part of the upper side wall 01 is provided with a plurality of L-shaped blanking pipes 015, grouting is conducted into the surrounding structure through the L-shaped blanking pipes 015, and gaps of the connecting section steel 031 are filled, so that concrete casting 034 is formed in the space surrounded by the upper side wall 01, the lower side wall 02 and the connecting steel plates 036.
In this application, lower side wall 02 adopts the bottom hoist and mount, and lower side wall 02's bottom sets up steel shoe plate 022 cladding to set up hoisting structure 023 on steel shoe plate 022, hoisting structure 023 includes rings and lifting hook. The upper side wall 01 is combined with the lower side wall 02 in the later period to form an integral side wall, so that a hoisting structure for hoisting is only arranged at the top. As shown in fig. 9, a plurality of hoisting steel plates 013 with hoisting holes are arranged at the top of the upper side wall 01, the hoisting steel plates 013 are uniformly distributed at the front end and the rear end of the top of the upper side wall 01, and the built-in main ribs 014 extend upwards to extend out of the upper side wall 01 and are welded with the hoisting steel plates 013, so that the hoisting steel plates 013 are fixed with the upper side wall 01.
The upper side wall 01 and the lower side wall 02 are connected through the vertical connecting nodes 03 to form an integral prefabricated side wall 05, the plurality of prefabricated side walls 05 are arranged to form an underground continuous wall, the prefabricated side walls 05 are connected through the wall connecting nodes 04, and the anti-seepage wall is arranged outside the prefabricated side walls 05, so that the structural strength and the waterproof performance of the underground continuous wall are improved. In the application, as shown in fig. 17, 4 jet grouting piles 042 are respectively arranged on two sides of a joint between prefabricated side walls 05, slurry is pumped out of the prefabricated wall bodies by hollowing, and a reinforcement cage pouring body 041 is arranged, so that the connection strength between the prefabricated side walls 05 is improved, and gaps between underground continuous walls are connected.
The rectangular prefabricated side wall is mostly used as a middle side wall 054 of the underground continuous wall, and wedge-shaped prefabricated side walls 05, namely wedge-shaped wall widths 053, are mostly adopted in special terrains such as a closed part at the end part of the underground continuous wall, and as shown in fig. 10, the wedge-shaped wall widths 053 are in a right trapezoid shape. The wedge-shaped wall width 053 arranged at the end part of the underground continuous wall and the adjacent wedge-shaped wall width 053 are arranged in opposite directions, after the wedge-shaped wall width 053 at the end part is fixed, the adjacent wedge-shaped wall width 053 is inverted, the adjacent wedge-shaped wall width 053 is inserted into the wall bottom from top to bottom along the edge of the wedge-shaped wall width 053 at the end part, and the wedge-shaped wall width 053 at the end part and the adjacent wedge-shaped wall width 053 are connected more tightly and firmly under the action of self weight. And the end part continuous wall is a rectangular side wall formed by splicing two wedge-shaped wall sheets 053, and the splicing parts of the two side walls are matched with each other, so that the downward placing deviation of the end part side wall of the ground wire continuous wall can be reduced, the middle side wall 054 part of the underground continuous wall can be smoothly placed, and the problem of the placement of the subsequent prefabricated side wall caused by the deviation of the end part of the underground continuous wall can be avoided.
A construction method for designing a side wall with an assembled underground continuous wall serving as a main structure comprises the following construction steps:
and S1, arranging guide wall platforms 09 at two ends of an underground continuous wall groove 08, excavating the underground continuous wall groove 08, and backfilling silt soft soil after grooving. As shown in fig. 11.
The guide wall platform 09 serves as a construction foundation of the underground diaphragm wall, plays a role in guiding for excavating the underground diaphragm wall groove 08, bears the load of subsequent construction machinery such as a grooving machine and a crane, and provides calibration and reference for the arrangement of side walls, positioning steel pipes 081 and the like. And homogeneous muddy soft soil is backfilled after the underground continuous wall groove 08 is excavated, so that geological conditions suitable for the sinking of the prefabricated wall body are created for the placement of subsequent side walls, the side friction resistance between the prefabricated wall body and the soil body is effectively reduced, and the problems of difficult sinking, easy deflection and the like caused by uneven hardness of the soil are solved.
In the present application, the wall guiding platform 09 is in a downward L shape and is made of C30 concrete.
And S2, installing a positioning steel pipe 081, and grouting the bottom of the positioning steel pipe 081 for anchoring. As shown in fig. 12.
Drilling a hole in the underground continuous wall groove 08 to the depth of a designed positioning steel pipe 081, installing the positioning steel pipe 081 on the guide wall platform 09 by using mechanical positioning, and controlling the verticality of the positioning steel pipe 081 to be less than or equal to 1/500. In order to accurately determine the sinking position and the verticality of the underground diaphragm wall, sleeve valve steel tubes are adopted for grouting to form anchoring bodies 082. And (3) extending the sleeve valve steel pipe to the bottom of the positioning steel pipe 081, grouting soil at the bottom of the positioning steel pipe 081 to the height of the grouting till 2 meters below the design wall, thus finishing anchoring of the positioning steel pipe 081, further stabilizing the position of the positioning steel pipe 081 and ensuring the verticality of the positioning steel pipe 081. After the sleeve valve steel pipe is grouted, the positioning and fixing device on the wall guiding platform 09 can be released.
And S3, installing the hoisting equipment 10, moving the lower side wall 02 to the opening 08 of the underground continuous wall, butting the lower side wall with a positioning steel pipe 081, controlling the lower side wall 02 to sink through a pulley block 101 and a steel wire rope 102, and fixing the lower side wall 02 on a guide wall platform 09 after the lower side wall 02 sinks to a set depth. As shown in fig. 13 and 14.
The prefabricated lower side wall 02 is transported to the opening of the underground diaphragm wall channel 08 using a movable formwork trolley. The bottom of the lower side wall 02 is provided with a steel shoe plate 022, two sides of the steel shoe plate 022 are provided with hanging rings, a hoisting device 10 consisting of a pulley block 101, a movable mounting bracket and the like is arranged on the guide wall platform 09, and the lower side wall 02 is hoisted to a position 1500 mm above a 08 opening of the underground continuous wall groove through the pulley block 101 and a steel wire rope 102. After the embedded sleeve is lifted, the embedded sleeve in the lower side wall 02 and the anchored positioning steel pipe 081 are installed in an aligned mode through the sleeves, grease is coated outside the embedded sleeve for lubrication before alignment, the installation difficulty of the embedded sleeve and the positioning steel pipe 081 is reduced, butt joint installation of the embedded sleeve and the positioning steel pipe 081 is completed more efficiently, and butt joint is avoided being completed in modes of collision and the like.
When the lower side plate is hoisted, the hoisting length of the steel wire rope is cooperatively controlled to control the sinking depth of the lower side wall 02, and the tensile force of the steel wire rope 102 is continuously reduced along with the fact that the lower side wall 02 is deep into the underground continuous wall groove 08, so that the lower side wall 02 slowly sinks in the backfilled sludge soft soil. And when the natural sinking of the lower side wall 02 is blocked and the lower side wall cannot sink by itself, the top of the lower side wall 02 is assisted by a reaction frame and a jack. In the process of sinking assisting, the length of the steel wire rope 102 is adjusted step by step according to the stroke of the jack and the sinking depth of the lower side plate.
The rings of the lower side wall 02 are arranged at the bottom, the positions are the sinking front end positions of the lower side wall 02, the control of the sinking rhythm and the sinking direction of the bottom is completed, and the control of the sinking of the lower prefabricated side wall 05 is equivalently completed, so that the rings are arranged at the bottom, and the control of the sinking direction and the verticality of the lower side wall 02 is facilitated.
In the hoisting process, an engineer can change the length and the tension of the steel wire ropes 102 of the hoisting devices 10 on the two sides by adjusting the steel wire ropes 102, including the tightness, the inclination angle, the hoisting length and the like of the steel wire ropes 102, so that the sinking speed and the stability of the lower side wall 02 are controlled, the wall is guaranteed to sink uniformly, and the wall is prevented from sinking suddenly and inclining.
The lower side wall 02 sinks gradually along the positioning steel pipe 081 under the drive of the steel wire rope 102, the reaction frame and the jack. When the top of the lower side wall 02 is 1 meter away from the 08 opening of the underground continuous wall groove, the work of the steel wire rope 102, the reaction frame and the jack is stopped, the connecting steel plate 036 is connected with the steel shoe plates 022 on the two sides of the lower side wall 02 through bolts, and the lifting rings on the two sides of the lower side wall 02 are controlled, so that the lower side wall 02 is fixed on the guide wall platform 09 and does not sink any more.
S4, transporting the upper side wall 01 to the position above the lower side wall 02 and butting the upper side wall 01 with the positioning steel pipe 081, and arranging a vertical connecting node 03 between the upper side wall 01 and the lower side wall 02 to connect the upper side wall 01 and the lower side wall 02. As shown in fig. 15.
And (3) roughening the top of the lower side wall 02, and finishing and flattening the joint of the lower side wall 02 and the upper side wall 01. And hoisting the upper side wall 01 by using hoisting equipment, and lifting the upper side wall 01 to a position 500 mm above the top of the lower side wall 02. Meanwhile, the embedded sleeves inside the upper side wall 01 are aligned with the positioning steel pipes 081 in a sleeved mode, butt joint of the sleeves is completed, grease is also coated on the outer portions of the embedded sleeves before alignment, and the butt joint efficiency is improved.
After the upper side wall 01 is in butt joint with the positioning steel pipe 081, the bottom of the upper side wall 01 is fixedly connected with the longitudinal middle section steel at the top of the lower side wall 02 through the connecting batten plate 032 and the bolts, the steel plate is welded on the side face to be sealed, and micro-expansion concrete is poured in situ through blanking holes in the side face of the upper side wall 01 to form a vertical connecting node, so that the upper side wall 01 is fixedly connected with the lower side wall 02. In the process of fixedly connecting the upper side wall 01 and the lower side wall 02, the embedded grouting pipes 051 inside the upper side wall 01 and the lower side wall 02 are connected by steel sleeves, and a plurality of vertical grouting pipes communicated from the upper side wall 01 to the lower side wall 02 are formed.
And S5, removing the fixed structure of the lower side wall 02, operating the prefabricated side wall 05 through the steel wire rope 102 and the pulley block 101 to hoist and sink to a designed elevation, and fixing the position of the prefabricated side wall 05. As shown in fig. 16.
After micro-expansion concrete is poured between the upper side wall 01 and the lower side wall 02 to form a connecting node, after the connecting node reaches a certain strength, the fixed structure of the lower side wall 02 is removed, and the steel wire ropes 102 of the hoisting devices 10 on the two sides are continuously controlled to sink the prefabricated side wall 05 formed by combining the upper side wall 01 and the lower side wall 02. The same as the hoisting of the lower side wall 02 which sinks, the sinking speed and the stability of the prefabricated side wall 05 are controlled by adjusting the steel wire rope 102, the prefabricated side wall 05 cannot naturally sink and is blocked, when the prefabricated side wall cannot sink, the top of the upper side wall 01 is assisted by using a reaction frame and a jack, and the length of the steel wire rope 102 is gradually adjusted according to the stroke of the jack. Therefore, the lower city of the prefabricated side wall 05 reaches the designed elevation, the steel wire rope 102 is tensioned, the work of the steel wire rope 102, the reaction frame and the jack is stopped, and the position of the prefabricated side wall 05 is fixed.
And S6, grouting is carried out on the pre-buried grouting pipe 051 and the positioning steel pipe 081 inside the prefabricated side wall 05, and soft silt soil in the underground continuous wall groove 08 is replaced.
After the prefabricated side wall 05 consisting of the upper side wall 01 and the lower side wall 02 sinks, pressure is applied to the interior of the underground continuous wall groove 08 for grouting through an embedded grouting pipe 051 and a positioning steel pipe 081 which are arranged in the prefabricated side wall 05 and are communicated, so that the backfilled sludge soft soil in the step S1 is replaced, the concrete is filled in the underground continuous wall groove 08 to reinforce the prefabricated side wall 05, the prefabricated side wall 05 is guaranteed not to sink excessively after sinking to the designed elevation, a gap between the outer side of the prefabricated side wall 05 and a back soil body is filled and reinforced, and the strength of the prefabricated side wall 05 is improved.
And S7, cutting off redundant positioning steel pipes 081 and steel wire ropes 102, plugging the positioning steel pipes 081 and the pre-buried grouting pipes 051, and finishing the construction of the side wall.
After the replaced concrete is reinforced, the positioning steel pipe 081 and the steel wire rope 102 above the top of the prefabricated side wall 05 are cut off, self-compacting concrete is poured into the positioning steel pipe 081 and the pre-buried grouting pipe 051 for plugging, and the construction of the side wall is completed.
And S8, repeating the steps S1-S7, and continuing the construction of the subsequent wall panels, thereby finishing the construction of the underground continuous wall.
In this step, the wedge-shaped wall strips 053 at the end of the underground diaphragm wall are lowered to the bottom of the underground diaphragm wall channel 08 in accordance with steps S1 to S7, and then the wedge-shaped wall strips 053 adjacent thereto are lowered along the edge of the wedge-shaped wall strips 053 at the end and are brought into close contact with the wedge-shaped wall strips 053 at the end under the action of their own weight, so that the wedge-shaped wall strips 053 at the end and the wedge-shaped wall strips 053 adjacent thereto are tightly fitted.
And S9, performing seam treatment on the prefabricated side wall 05. As shown in fig. 17.
And a primary and secondary steel plate is arranged at the joint between the prefabricated side walls 05 for locking connection to realize positioning and fixing, and two sides of the joint are provided with the anti-seepage walls. The method comprises the following specific steps:
and a primary and a secondary steel plates are arranged between the prefabricated wall panels for locking, the two sides of the prefabricated wall panels are provided with the anti-seepage walls, and reinforced concrete is poured after the soil body between the joints is cleaned and drained, so that the structural strength and the waterproof performance of the joints can be ensured.
Step A1, after the construction of all the side walls is finished, arranging a plurality of jet grouting piles 042 on two sides of the joint between the prefabricated side walls 05, wherein the bottoms of the jet grouting piles 042 are flush with the bottom of the lower side wall 02;
step A2, flushing the joint between the prefabricated side walls 05 by adopting a water drilling method, pumping away slurry, and pouring concrete to a position 1 m below the bottom plate;
step A3, manually cleaning the wall body in the underground continuous wall groove 08, and welding a primary and secondary steel plate between the prefabricated side walls 05 for connection and positioning;
and step A4, chiseling the wall surfaces of the prefabricated side walls 05, hoisting a reinforcement cage between the prefabricated side walls 05 and pouring concrete with a grouting pipe, wherein the concrete needs to be reinforced and vibrated to ensure the quality.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an assembled underground continuous wall does major structure side wall design concurrently, its characterized in that, including prefabricated last side wall and downside wall, go up the side wall with all be provided with buried sleeve in the downside wall, buried sleeve includes position sleeve and pre-buried slip casting pipe, go up the side wall with the side wall passes through vertical connected node fixed connection down and forms prefabricated side wall, go up the buried sleeve of side wall with the buried sleeve intercommunication of side wall down, prefabricated side wall sets up a plurality of connection notches, prefabricated side wall passes through connect notch and mainboard structural connection.
2. The design of the side wall with the main structure of the assembled underground continuous wall as claimed in claim 1, wherein the pre-buried sleeve vertically penetrates through the upper side wall and the lower side wall, a positioning steel tube is anchored in the groove of the underground continuous wall, and the positioning sleeve is connected with the positioning steel tube, so that the upper side wall and the lower side wall sink along the positioning steel tube.
3. The design of the assembled underground diaphragm wall doubling as a main structure side wall as claimed in claim 1, wherein the vertical connecting nodes comprise connecting steel plates, connecting section steel and concrete castings, the connecting steel plates are respectively connected with the bottom of the upper side wall and the top of the lower side wall and form a closed surrounding structure, the connecting section steel is respectively arranged at the bottom of the upper side wall and the top of the lower side wall and fixedly connected with each other, and the concrete is filled in the space surrounded by the upper side wall, the lower side wall and the connecting steel plates to form the concrete castings.
4. The design of the side wall with the assembled underground continuous wall also serving as the main structure is characterized in that a connecting batten plate is erected between the connecting section steels, and the connecting batten plate is connected with the connecting section steels on the upper side and the lower side through connecting bolts.
5. The design of the side wall with the fabricated underground continuous wall also serving as the main structure is characterized in that the bottom of the upper side wall and the top of the lower side wall are both provided with connecting angle steel, and the connecting steel plates are respectively and fixedly connected with the connecting angle steel on the upper side and the lower side.
6. The design of the side wall with the main structure of the assembled underground continuous wall as claimed in claim 1, wherein the upper side wall is provided with a plurality of middle plate preformed grooves, the lower side wall is provided with bottom plate preformed grooves, and the middle plate preformed grooves and the bottom plate preformed grooves are both provided with built-in channel steel and filler.
7. The design of the side wall with the fabricated underground continuous wall also serving as the main structure is characterized in that the prefabricated side walls are fixedly connected through wall connecting nodes, the wall connecting nodes comprise a plurality of jet grouting piles and connecting casting bodies, the jet grouting piles are arranged on two sides of the connecting position of the prefabricated side walls, reinforcing cages are arranged between the prefabricated side walls, and the connecting casting bodies are formed by casting the reinforcing cages.
8. A construction method for designing a side wall with an assembled underground continuous wall serving as a main structure is characterized by comprising the following construction steps:
s1, arranging guide wall platforms at two ends of an underground continuous wall groove, excavating the underground continuous wall groove, and backfilling silt soft soil after the groove is formed;
s2, installing a positioning steel pipe, and grouting the bottom of the positioning steel pipe for anchoring;
s3, installing hoisting equipment, moving the lower side wall to a notch of the underground continuous wall, butting the lower side wall with the positioning steel pipe, controlling the lower side wall to sink through a pulley block and a steel wire rope, and fixing the lower side wall on the guide wall platform after the lower side wall sinks to a set depth;
s4, transporting an upper side wall to the position above the lower side wall and butting the upper side wall with the positioning steel pipe, and arranging a vertical connecting node between the upper side wall and the lower side wall to connect the upper side wall and the lower side wall to form a prefabricated side wall;
s5, removing a fixed structure of the lower side wall, operating the prefabricated side wall to hoist and sink to a designed elevation through the steel wire rope and the pulley block, and fixing the position of the prefabricated side wall;
s6, grouting is conducted on the pre-buried grouting pipe inside the prefabricated side wall and the positioning steel pipe, and soft silt soil in the underground continuous wall groove is replaced;
s7, cutting off redundant positioning steel pipes and steel wire ropes, plugging the positioning steel pipes and the embedded grouting pipes, and completing the construction of the side wall;
s8, repeating the steps S1-S7, and continuing the construction of the subsequent wall panels so as to finish the construction of the underground continuous wall;
and S9, performing seam treatment between the prefabricated side walls.
9. The construction method of the side wall design of the fabricated underground continuous wall concurrently serving as the main structure as claimed in claim 8, wherein in step S2, sleeve valve steel tubes are arranged to extend below the positioning steel tubes, and soil around the anchoring points is anchored by grouting through the sleeve valve steel tubes.
10. The method as claimed in claim 8, wherein step S9 includes designing the side wall of the prefabricated underground diaphragm wall as the main structure
A1, arranging a plurality of rotary spraying piles on two sides of a joint between the prefabricated side walls, wherein the bottoms of the rotary spraying piles are flush with the bottom of the lower side wall;
step A2, flushing the joints between the prefabricated side walls by adopting a water drilling method, then pumping away slurry, and pouring concrete to a position 1 m below the bottom plate;
step A3, cleaning the wall bodies in the underground continuous wall groove, and arranging primary and secondary steel plates between the prefabricated side walls for lock catch connection;
and step A4, chiseling the wall surfaces of the prefabricated side walls, and hoisting a reinforcement cage and pouring concrete through a grouting pipe between the prefabricated side walls.
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