CN115045299A - Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method - Google Patents
Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method Download PDFInfo
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- CN115045299A CN115045299A CN202210885144.4A CN202210885144A CN115045299A CN 115045299 A CN115045299 A CN 115045299A CN 202210885144 A CN202210885144 A CN 202210885144A CN 115045299 A CN115045299 A CN 115045299A
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- 238000005370 electroosmosis Methods 0.000 title claims abstract description 44
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 134
- 239000010959 steel Substances 0.000 claims abstract description 134
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000001737 promoting effect Effects 0.000 claims abstract description 17
- 230000005684 electric field Effects 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 33
- 101150054854 POU1F1 gene Proteins 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 10
- 239000011440 grout Substances 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 230000000087 stabilizing effect 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
- 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
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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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
-
- 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
- E02D5/22—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
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Foundations (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a deep and large foundation pit side wall reinforcing structure with electroosmosis and drainage functions and a construction method, which comprises the following steps: designing a foundation pit and preparing construction; designing and preparing components; driving a triaxial mixing pile wall; excavating and reinforcing a foundation pit; connecting the device and injecting an electroosmosis promoting liquid; draining water behind the foundation pit wall; continuously excavating the foundation pit and monitoring deformation; and (5) subsequent ending work. The beneficial effects of the invention are: the arch frame structure, the I-steel connecting piece and the I-steel form a stressed whole, and the steel purlin and the steel support are matched, so that the stability of the structure is effectively improved; insulating treatment is carried out by using an insulating connecting piece, an electroosmosis drainage range is expanded by using an electroosmosis promoting liquid, and underground water is collected around the arch centering by using the action of an electric field and is finally drained out of the foundation pit; a grouting opening and a grouting channel are reserved, so that rapid grouting operation when the foundation pit is excessively deformed can be realized; each component is prefabricated in advance, and the construction period is effectively shortened.
Description
Technical Field
The invention belongs to the technical field of foundation pit excavation and reinforcement, and particularly relates to a deep and large foundation pit side wall reinforcing structure with an electro-osmosis water drainage function and a construction method.
Background
With the increasing shortage of urban underground space, the excavation of deep and large foundation pits often causes disturbance to adjacent pile foundations, tunnels and the like; on the other hand, the excavation depth of the foundation pit is large, and the underground water in the soil body behind the wall easily influences the foundation pit, so that the side wall of the foundation pit leaks water, deforms and even collapses. Therefore, the foundation pit is timely and stably supported in the excavation process, and meanwhile, the underground water outside the foundation pit is timely discharged.
Traditional foundation pit supporting reinforcement technology includes modes such as support reinforcement in the foundation pit, promotion fender pile intensity. The inner support reinforcing structures are simple in connection, poor in stability and prone to certain potential safety hazards; and the mode of increasing fender post intensity is limited to the resistance to deformation ability effect of promotion lateral wall, and has improved the cost greatly.
Aiming at the problem of underground water, the traditional treatment method comprises the steps of arranging a water stop wall and lowering water in a foundation pit. The water stop wall is generally formed by piling and pouring a triaxial mixing pile machine, deviation is easy to generate, gaps are generated, underground water mixed with sandy soil flows into a foundation pit along the gaps, piping occurs, and risks are caused; the foundation pit dewatering method comprises various technologies and has different effects.
In summary, the existing foundation pit supporting and dewatering measures have the defects of poor stability, limited control effect, high cost and the like, and need to be solved by improving the technology urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a deep and large foundation pit side wall reinforcing structure with an electro-osmosis water drainage function and a construction method.
This kind of contain deep and big foundation ditch lateral wall reinforced structure of electroosmosis drainage function, its characterized in that includes: the foundation pit, the arch frame structure, the steel purlin, the steel support and the triaxial mixing pile wall;
the side wall of the foundation pit is provided with a triaxial mixing pile wall, a plurality of layers of steel purlins and steel supports are arranged inside the side wall of the foundation pit, the steel supports are arranged between the steel purlins, and a plurality of arch-type frame structures are arranged between every two circles of steel purlins which are adjacent up and down;
the arch type frame structure comprises an arch frame and a vertical rod, wherein the arch frame is semicircular, and the upper end and the lower end of the vertical rod are connected with two ends of the arch frame; a plurality of support rods are horizontally arranged between the arch center and the vertical rods, and inclined rods are obliquely connected between the support rods; wires are embedded in the arch center and the vertical rods; insulating connecting pieces are arranged at the joints among the arch frame, the supporting rods, the vertical rods and the inclined rods;
i-shaped steel is continuously arranged in the triaxial mixing pile wall, adjacent I-shaped steel is connected through an I-shaped steel connecting piece, and a hollow inserting groove is formed in the center of the I-shaped steel connecting piece; the arch frame structure is inserted into the soil body behind the wall through the hollow slot.
Preferably, the method comprises the following steps: the electric wire in the arch center is embedded outside the drainage channel at one side far away from the vertical rod; the electric wire in the vertical rod is embedded outside the grouting channel and far away from one side of the arch center; the electric wires in the arch frame and the vertical rod are respectively connected with the arch frame power interface and the vertical rod power interface.
Preferably, the method comprises the following steps: the cross section of the arch center is a hollow rectangular cross section, the center of the cross section is a drainage channel, and the lower end of the drainage channel is connected with a water outlet pipe; the pipe walls of one side of the arch centering close to the vertical rod and the two adjacent sides are provided with a plurality of circular drain holes at equal intervals, the circular drain holes are connected with a drain passage, and the orifices of the circular drain holes are provided with filter screens.
Preferably, the method comprises the following steps: the supporting rod is internally provided with a hollow pipeline and is communicated with the outer surface through pulp outlet holes arranged on the surface at equal intervals; the inside center of montant sets up the slip casting passageway, and the hollow pipeline intercommunication in slip casting passageway and each bracing piece.
Preferably, the method comprises the following steps: the two ends of the insulating connecting piece are provided with protruding pins, and the surfaces of the pins are provided with threads; bolt holes corresponding to the threads are reserved on the vertical rods and the arch center, and the sections of the two ends of the insulating connecting piece are cambered surfaces attached to the surface of the component.
Preferably, the method comprises the following steps: the I-steel connecting piece is of a multilayer structure, and a hollow inserting groove is formed in the center of each layer of the I-steel connecting piece; blocking steel sheets are arranged at the notches at the two ends of the hollow insertion groove, and are opened in a single direction; the hollow inserting slot is fixed between the adjacent I-shaped steels through four fixing arms arranged at the upper end and the lower end;
the height and the thickness of the arch-type frame structure are smaller than the size of the inner wall of the hollow inserting groove, the arch-type frame structure is inserted into the soil body behind the wall from the inside of the foundation pit through the middle hole inserting groove, and the vertical rod is fixed inside the hollow inserting groove.
The construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmosis drainage function comprises the following steps:
s1, foundation pit design and construction preparation: designing the size and the depth of a foundation pit according to engineering requirements, leveling the field, completing measurement and positioning work on the ground surface in advance, and well performing precipitation work;
s2, designing and preparing components: determining the number of reinforcing layers according to the depth of the foundation pit, designing the height of the arch-shaped frame structure according to the height between two adjacent layers of steel enclosing purlins, wherein the number of layers of I-steel connecting pieces is the same as the number of reinforcing layers of the foundation pit; the arch frame structure, the steel purlin, the steel support, the I-steel and the I-steel connecting piece which are used later and have corresponding sizes are prefabricated in advance by a factory and are prepared properly before construction;
s3, constructing a triaxial stirring pile wall: moving a triaxial mixing pile machine to a design position, sequentially driving triaxial mixing piles, and sequentially completing the insertion of I-shaped steel and I-shaped steel connecting pieces before a pile body is hardened; after the construction is finished, marking the position where the I-shaped steel connecting piece is embedded, and marking the position of the corresponding hollow inserting groove;
s4, excavation and reinforcement of the foundation pit: after the triaxial mixing pile wall is hardened to a specified strength, carrying out layered excavation on the foundation pit according to the design depth, installing all arch-type frame structures of the layer, and installing a steel purlin and a steel support at the bottom of each layer for reinforcement;
s5, connecting the device and injecting an electroosmosis promoting liquid: then, a plastic hose is used for connecting a water outlet pipe at the lower part of each arch-type frame structure, and arch power interfaces of left and right adjacent arch-type frame structures are respectively connected with the positive pole and the negative pole of a direct-current power supply, so that the arches of the adjacent arch-type frame structures respectively become a positive pole and a negative pole; then, injecting electroosmosis promoting liquid by using a water outlet pipe on the anode arch type frame structure, and injecting the electroosmosis promoting liquid into the surrounding soil body through a drainage channel and a drainage hole; turning on a power supply to enable the electroosmosis liquid around the arch-shaped frame structure of the original anode to flow to a cathode, and turning off the power supply after the electroosmosis liquid uniformly permeates between the adjacent arch-shaped frame structures;
s6, draining water behind the foundation pit wall: connecting the positive pole of a power supply with the vertical pole power supply interface of each arch frame structure, connecting the negative pole of the power supply with the arch frame power supply interface of each arch frame structure, enabling each vertical pole to become an electroosmosis anode and each arch frame to become an electroosmosis cathode, after the power supply is turned on, enabling underground water close to the side wall of the foundation pit to flow to the vicinity of the arch frames under the action of an electric field, enabling the underground water to enter an internal drainage channel through a reserved drainage hole in the arch frames, and finally discharging the underground water out of the foundation pit through a water outlet pipe;
s7, continuously excavating the foundation pit and monitoring deformation: continuously excavating the foundation pit downwards, repeating the steps S4, S5 and S6 after excavating to a specified depth to complete the installation and use of the arch frame structure, the steel purlin and the steel support, synchronously performing drainage work behind the upper wall when excavating the foundation pit at the lower layer, and simultaneously strictly monitoring the deformation condition of the side wall of the foundation pit;
s8, subsequent ending work: and after the integral structure of the foundation pit is constructed and stabilized, dismantling the recycled steel purlin and the steel support.
Preferably, in step S3: i-shaped steel is continuously driven in each triaxial mixing pile, and I-shaped steel connecting pieces are driven at intervals; in the inserting process, I-shaped steel and the I-shaped steel connecting piece are vertically inserted into the triaxial mixing pile wall, and meanwhile, fixing arms on two sides of the I-shaped steel connecting piece 17 are lapped in the I-shaped steel.
Preferably, in step S4: when the depth of the bottom of each two layers is dug to a specified depth, finding out the position where the I-shaped steel connecting piece is embedded in advance; the reinforced soil on the surface of the hollow inserting groove is stripped in advance, the surface of the arch type frame structure prefabricated and assembled in advance in a factory is subjected to rust prevention treatment, and then the arch type frame structure is inserted into the hollow inserting groove, so that the vertical rod 5 is fixed in the hollow inserting groove.
Preferably, in step S7: when the deformation value of a side wall at a certain position is detected to be overlarge in the excavation process of the foundation pit, grouting by using a grouting opening reserved on the arch type frame structure; and grout is injected into the soil body from the grout outlet hole on the surface of the supporting rod through the grouting channel to perform grouting reinforcement on the surrounding soil body.
The invention has the beneficial effects that:
1) the arch-type frame structure is adopted to reinforce the side wall of the foundation pit, the arch-type frame structure is fixed in the I-steel connecting piece, and the I-steel connecting piece is fixed between adjacent I-steels in the triaxial mixing pile wall, so that a stressed whole is formed, and the strength of the side wall is effectively improved; and meanwhile, the steel enclosing purlin and the steel support are matched for use, so that the stability of the structure is improved, and the deformation resistance is enhanced.
2) The invention uses the insulating connecting piece to insulate each part of the arch frame structure, and connects the positive pole and the negative pole of the power supply, so that the whole vertical pole becomes the positive pole, the whole arch frame becomes the negative pole, the underground water is far away from the side wall of the foundation pit under the action of the electric field and is collected around the arch frame, and then is discharged out of the foundation pit through the drain hole, the drain channel and the water outlet pipe, thus playing the roles of reinforcing the soil body and eliminating the harm of the underground water; and the electroosmosis drainage range is enlarged by injecting the electroosmosis promoting liquid before electroosmosis drainage, and the drainage effect is effectively improved.
3) The structure of the invention is reserved with a grouting opening and a grouting channel, which can realize the rapid grouting operation when the foundation pit has overlarge deformation, and the grout is uniformly filled into the soil around the rear wall of the foundation pit, thereby playing the effects of reinforcing the soil and effectively preventing the further development of deformation.
4) According to the invention, all structural parts are prefabricated and assembled in advance by a factory, and can be installed and used after simple treatment on a construction site, so that the operation is convenient and rapid, the field working errors can be reduced, the engineering quality can be ensured, and the construction period can be effectively shortened.
Drawings
FIG. 1 is a schematic front view of the overall structure of the present invention;
FIG. 2 is a schematic view of the installation of adjacent arch frame structures on the sidewalls of a foundation pit;
FIG. 3 is a general schematic view of an arch frame structure;
FIG. 4 is a schematic cross-sectional view of the arch A-A of FIG. 3;
FIG. 5 is a schematic cross-sectional view of the vertical bar B-B of FIG. 3;
FIG. 6 is a three-dimensional schematic view of an I-steel joint;
FIG. 7 is a schematic view of the installation location of the I-beam connection;
FIG. 8 is a schematic illustration of the installation process of the arched frame structure;
FIG. 9 is a schematic view of the diffusion direction of the electroosmotic fluid in the earth;
FIG. 10 is a schematic view of electroosmotic drainage;
fig. 11 is a schematic view of grouting reinforcement.
Description of reference numerals: the foundation pit supporting structure comprises a foundation pit 1, an arch frame structure 2, an arch frame 3, a supporting rod 4, a vertical rod 5, an insulating connecting piece 6, an arch frame power supply interface 7, a vertical rod power supply interface 8, a grouting opening 9, a water outlet pipe 10, a water outlet hole 11, a grout outlet hole 12, a steel surrounding purlin 13, a steel support 14, a triaxial stirring pile wall 15, I-shaped steel 16, an I-shaped steel connecting piece 17, a fixing arm 18, a hollow inserting groove 19, a blocking steel sheet 20, electric wires 21, a water outlet channel 22, a filter screen 23, a grouting channel 24 and an inclined rod 25.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
Example one
As an embodiment, as shown in fig. 1 to 11, the deep and large foundation pit side wall reinforcing structure with the electro-osmosis drainage function includes a foundation pit 1, an arch frame structure 2, an arch 3, a support rod 4, a vertical rod 5, an insulating connector 6, an arch power interface 7, a vertical rod power interface 8, a grouting port 9, a water outlet pipe 10, a drainage hole 11, a grout outlet hole 12, a steel purlin 13, a steel support 14, a triaxial mixing pile wall 15, an i-steel 16, an i-steel connector 17, a fixing arm 18, a hollow inserting slot 19, a blocking steel sheet 20, an electric wire 21, a drainage channel 22, a filter screen 23, a grouting channel 24, and an inclined rod 25.
As shown in fig. 1, the foundation pit 1 is surrounded by a triaxial mixing pile wall 15, and a plurality of layers of reinforcing structures are arranged according to the depth, each layer of reinforcing structure comprises a steel surrounding purlin 13 and a steel support 14 which are arranged on the side wall of the foundation pit 1, and an arch frame structure 2 is arranged in the wall back soil body between the adjacent steel surrounding purlins 13 of the upper layer and the lower layer, so that the functions of reinforcement and drainage are achieved.
As shown in fig. 2, the arch frame structures 2 are arranged on the side wall of the foundation pit 1 at intervals in the transverse direction and adjacently in the vertical direction, and the arch frame structures 2 adjacent to each other in the vertical direction are arranged on the same i-steel connecting piece 17.
As shown in fig. 3, the arch frame structure 2 is formed by connecting a semicircular arch 3 and a vertical rod 5 through an insulating connecting piece 6, and three supporting rods 4 and two inclined rods 25 are arranged between the semicircular arch and the vertical rod for reinforcement, so that the overall structure is more stable; two ends of each supporting rod 4 and each inclined rod 25 are connected to the arch frame 3 and the vertical rod 5 through the insulating connecting piece 6; the arch frame 3 is a hollow steel pipe, a plurality of groups of drain holes 11 are annularly arranged on the surface at equal intervals, a drain passage 22 and an electric wire 21 are arranged in the arch frame, the power supply interface 7 of the arch frame is arranged at the tail end of the upper part, and a water outlet pipe 10 is arranged at the tail end of the lower part and is communicated with the internal drain passage 22; the support rod 4 is horizontally arranged and is a hollow steel pipe, a plurality of groups of grout outlet holes 12 are annularly and equidistantly arranged on the surface of the support rod, and a grouting channel 24 is arranged inside the support rod; the inside slip casting passageway 24 and the electric wire 21 that sets up of montant 5, slip casting mouth 9 is connected to slip casting passageway 24 upper end, inside three spinal branch vaulting poles 4 inside of intercommunication respectively, and inside electric wire 21 then connects the montant power source 8 of montant 5 upper end.
As shown in fig. 4, a plurality of sets of drainage sections are arranged on the arch frame 3, the section a-a is a drainage section, the section is a rectangular section, a drainage channel 22 is arranged at the center, the electric wire 21 is embedded in the side wall far away from the vertical rod 5, a drainage hole 11 is arranged on the side wall in the other three directions, each drainage hole 11 is cylindrical, and a filter screen 23 is arranged at the hole opening to prevent external soil from entering, thereby blocking the drainage hole 11 or the drainage channel 22.
As shown in fig. 5, the section B-B is a cross section on the vertical bar 5, and is a rectangular section, the center of the section B-B is provided with a grouting channel 24, the side far away from the arch 3 is provided with an electric wire 21, and the side near the arch 3 is provided with a channel connecting support bar 4 internal grouting channel 24.
As shown in fig. 6, the i-steel connecting member 17 has a double-layer structure, and in actual engineering, a multi-layer structure can be designed according to the depth of the foundation pit 1, and each layer of the main structure of the i-steel connecting member 17 is a hollow inserting slot 19, and the size of the main structure is slightly larger than the height and thickness of the arch-shaped frame structure 2, so that the arch-shaped frame structure 2 can pass through the main structure; four fixing arms 18 are arranged at the upper end and the lower end of the hollow inserting groove 19 and are used for fixing the whole I-shaped steel connecting piece 17 between the adjacent I-shaped steels 16.
As shown in fig. 7, the triaxial mixing pile wall 15 is formed by overlapping three triaxial mixing piles, an i-steel 16 is inserted into the center of each triaxial mixing pile, an i-steel connector 17 can be arranged between adjacent i-steels 16, the i-steel connector 17 is divided into a hollow insertion slot 19 and a fixing arm 18, the hollow insertion slot 19 is perpendicular to the triaxial mixing pile wall 15, two end openings are respectively provided with a blocking steel sheet 20 to prevent soil outside the foundation pit 1 from entering the hollow insertion slot 19, and the fixing arm 18 is overlapped on the adjacent i-steel 16.
As shown in fig. 8, the arch frame structure 2 can be inserted into the soil behind the wall of the triaxial mixing pile wall 15 through the hollow inserting slot 19 of the i-steel connecting member 17, and the vertical rod 5 can be just fixed inside the hollow inserting slot 19 and tightly attached.
As shown in fig. 9, before electroosmotic drainage, the power supply interface 7 of the arch frame structure 2 is connected to the positive electrode and the negative electrode of the power supply, respectively, so that the arch frames 3 on the adjacent arch frame structure 2 become the positive electrode and the negative electrode, respectively, then the electroosmotic promoting liquid is injected into the water outlet pipe 10 corresponding to the positive arch frame 3, the electroosmotic promoting liquid passes through the drainage channel 22 and is injected into the surrounding soil body from the drainage hole 11, under the action of the electric field, the electroosmotic promoting liquid will gradually permeate to the vicinity of the negative electrode from the positive electrode, and after the electroosmotic promoting liquid uniformly permeates into the surrounding soil layer, the power supply is turned off to complete the process.
As shown in fig. 10, before electroosmosis drainage, the anode of the power supply needs to be connected with the power supply interface 8 of the vertical rod, the cathode of the power supply needs to be connected with the power supply interface 7 of the arch centering, so that the vertical rod 5 and the arch centering 3 become an electroosmosis anode and a cathode respectively, then the water in the soil close to the side wall of the foundation pit 1 can permeate around the cathode arch centering 3 under the action of an electric field, enter the internal drainage channel 22 through the drainage hole 11 arranged on the arch centering 3, and finally drain out of the foundation pit 1 through the water outlet pipe 10, and a plurality of arch frame structures 2 can be reasonably arranged on the side wall of the foundation pit 1 for combined use, thereby improving the overall drainage effect and eliminating the harm of underground water to the deformation of the foundation pit 1.
As shown in fig. 11, if the deformation of a certain part of the foundation pit 1 is too large, rapid grouting reinforcement can be realized through the grouting opening 9, slurry will flow along the grouting channel 24 and be injected into the soil behind the wall through the slurry outlet 12, so that the whole arch-shaped frame structure 2 and the surrounding soil are connected into a whole reinforcement body, the anchoring effect is enhanced, and the deformation of the foundation pit 1 is controlled.
Example two
According to the deep and large foundation pit side wall reinforcing structure with the electro-osmosis drainage function provided in the first embodiment, the second embodiment provides a construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmosis drainage function, which comprises the following steps:
s1, designing and constructing a foundation pit 1: designing the size and the depth of the foundation pit 1 according to engineering requirements, leveling the site, completing measurement and positioning work on the ground surface in advance, and well performing precipitation work.
S2, component design and preparation: the number of reinforcing layers is determined according to the depth of a foundation pit 1, the height of the arch-shaped frame structure 2 is designed according to the height between two adjacent layers of steel enclosing purlins 13, the number of layers of the I-steel connecting pieces 17 is the same as that of the reinforcing layers of the foundation pit 1, the width and the height of each layer of hollow inserting groove 19 are slightly larger than that of the arch-shaped frame structure 2, the arch-shaped frame structure 2 can penetrate through the hollow inserting grooves 19, vertical rods 5 can be fixed in the hollow inserting grooves 19, and the arch-shaped frame structure 2, the steel enclosing purlins 13, the steel supports 14, the I-steel 16 and the I-steel connecting pieces 17 which are used subsequently and correspond to the sizes are prefabricated in advance by a factory and are prepared properly before construction.
S3, setting the triaxial mixing pile wall 15: moving a triaxial mixing pile machine to a design position, sequentially driving and arranging triaxial mixing piles, inserting I-steel 16 and I-steel connecting pieces 17 before hardening of a pile body, continuously driving the I-steel 16 in each triaxial mixing pile, designing the I-steel connecting pieces 17 at intervals, strictly measuring and controlling the gradient in the inserting process according to early engineering requirements and hydrogeological conditions, ensuring that the I-steel 16 and the I-steel connecting pieces 17 can be vertically inserted into a triaxial mixing pile wall 15, ensuring that the mounting direction of the I-steel connecting pieces 17 is correct, overlapping fixing arms 18 on two sides in the I-steel 16, marking the position where the I-steel connecting pieces 17 are embedded and marking the position of a corresponding hollow mounting slot 19 after the driving is finished.
S4, excavation and reinforcement of the foundation pit 1: after the triaxial mixing pile wall 15 hardens to appointed intensity, carry out the layering excavation to foundation ditch 1 according to the design depth, when digging to the appointed depth of every two layers of bottoms, find the position of burying I-steel connecting piece 17 underground in advance, strip a small amount of reinforcement soil on cavity ann slot 19 surface in advance, carry out surface rust-resistant treatment to the arch frame construction 2 of factory prefabrication equipment in advance, later vertically slowly insert in cavity ann slot 19, arch frame construction 2 wholly gets into behind the wall in the soil body, montant 5 is fixed in cavity ann slot 19, later install steel purlin 13 and steel shotcrete 14 and consolidate in each layer of bottom.
S5, connecting the device and injecting an electroosmosis promoting liquid: the installation of all the arch frame structures 2 on the layer is completed by repeating the installation steps, then the water outlet pipe 10 at the lower part of each arch frame structure 2 is connected by a plastic hose, the arch power supply interfaces 7 of the left and right adjacent arch frame structures 2 are respectively connected with the positive pole and the negative pole of a direct current power supply, so that the arches 3 of the adjacent arch frame structures 2 respectively become the positive pole and the negative pole, then the electroosmosis promoting liquid is injected by the water outlet pipe 10 on the anode arch frame structure 2 and is injected into the surrounding soil body through the drainage channel 22 and the drainage hole 11, under the action of an electric field, the electroosmosis promoting liquid around the anode arch frame structure 2 originally flows to the negative pole slowly, and after the electroosmosis promoting liquid uniformly permeates between the adjacent arch frame structures 2, the power supply is closed.
S6, draining water behind the wall of the foundation pit 1: the positive pole of a power supply is connected with a vertical pole power supply interface 8 of each arch type frame structure 2, the negative pole of the power supply is connected with an arch frame power supply interface 7 of each arch type frame structure 2, each vertical pole 5 becomes an electroosmosis anode, each arch frame 3 becomes an electroosmosis cathode, after the power supply is turned on, the water in the soil close to the side wall of the foundation pit 1 flows to the position near the arch frames 3 under the action of an electric field, then enters an internal drainage channel 22 through a drainage hole 11 reserved on the arch frames 3, and finally is discharged out of the foundation pit 1 through a water outlet pipe 10, so that the purpose of stabilizing the soil body behind the wall is achieved.
S7, continuously excavating the foundation pit 1 and monitoring deformation: continuously excavating the foundation pit 1 downwards, after excavating to a specified depth, repeating the steps S4, S5 and S6 to complete the installation and use of the arch-shaped frame structure 2, the steel purlin 13 and the steel support 14, and when excavating the foundation pit 1 at the lower layer, synchronously performing drainage work behind the upper wall and simultaneously strictly monitoring the deformation condition of the side wall of the foundation pit 1; if in the excavation process of foundation ditch 1, a certain lateral wall deformation value is too big, then utilize grout mouth 9 of reserving on the arch-type frame structure 2 to carry out the slip casting, the thick liquid will be through slip casting passageway 24, by the grout outlet 12 department of bracing piece 4 surface ring setting pour into the soil body into, carry out the slip casting reinforcement to the soil body on every side, increase stability, control foundation ditch 1 further deformation.
S8, subsequent ending work: and after the whole structure of the foundation pit 1 is constructed and stabilized, the recycled steel surrounding purlin 13 and the steel support 14 are dismantled.
Claims (10)
1. The utility model provides a contain deep and large foundation ditch lateral wall reinforced structure of electroosmosis drainage function which characterized in that includes: the foundation pit (1), the arch frame structure (2), the steel purlin (13), the steel support (14) and the triaxial mixing pile wall (15);
the side wall of the foundation pit (1) is provided with a triaxial stirring pile wall (15), multiple layers of steel enclosing purlins (13) and steel supports (14) are arranged inside the side wall of the foundation pit (1), the steel supports (14) are arranged between the steel enclosing purlins (13), and a plurality of arch-type frame structures (2) are arranged between every two circles of steel enclosing purlins (13) which are adjacent from top to bottom;
the arch type frame structure (2) comprises an arch frame (3) and a vertical rod (5), wherein the arch frame (3) is semicircular, and the upper end and the lower end of the vertical rod (5) are connected with two ends of the arch frame (3); a plurality of supporting rods (4) are horizontally arranged between the arch frame (3) and the vertical rod (5), and inclined rods (25) are obliquely connected between the supporting rods (4); electric wires (21) are embedded in the arch center (3) and the vertical rod (5); insulating connecting pieces (6) are arranged at the joints among the arch center (3), the supporting rods (4), the vertical rods (5) and the inclined rods (25);
i-shaped steel (16) is continuously arranged in the triaxial mixing pile wall (15), adjacent I-shaped steel (16) are connected through an I-shaped steel connecting piece (17), and a hollow inserting groove (19) is formed in the center of the I-shaped steel connecting piece (17); the arch frame structure (2) is inserted into the soil body behind the wall through the hollow inserting groove (19).
2. The deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, characterized in that: the electric wire (21) in the arch center (3) is embedded at one side of the drainage channel (22) far away from the vertical rod (5); the electric wire (21) in the vertical rod (5) is buried outside the grouting channel (24) and far away from one side of the arch center (3); the electric wires (21) in the arch frame (3) and the vertical rod (5) are respectively connected with the arch frame power interface (7) and the vertical rod power interface (8).
3. The deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, characterized in that: the cross section of the arch center (3) is a hollow rectangular cross section, the center of the cross section is provided with a drainage channel (22), and the lower end of the drainage channel (22) is connected with a water outlet pipe (10); a plurality of circular drain holes (11) are formed in the side, close to the vertical rod (5), of the arch center (3) and the pipe walls of the two adjacent sides at equal intervals, the circular drain holes (11) are connected with a drainage channel (22), and a filter screen (23) is arranged in an orifice of each circular drain hole (11).
4. The deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, characterized in that: a hollow pipeline is arranged in the supporting rod (4) and is communicated with the outer surface through pulp outlet holes (12) arranged on the surface at equal intervals; a grouting channel (24) is arranged in the center of the inner part of each vertical rod (5), and the grouting channel (24) is communicated with a hollow pipeline in each supporting rod (4).
5. The deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, characterized in that: two ends of the insulating connecting piece (6) are provided with convex pins, and the surfaces of the pins are provided with threads; bolt holes corresponding to the threads are reserved on the vertical rods (5) and the arch center (3), and the sections of the two ends of the insulating connecting piece (6) are cambered surfaces attached to the surfaces of the components.
6. The deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, characterized in that: the I-shaped steel connecting pieces (17) are arranged in a multilayer structure, and a hollow inserting groove (19) is formed in the center of each layer of I-shaped steel connecting piece (17); blocking steel sheets (20) are arranged at the notches at the two ends of the hollow inserting groove (19), and the blocking steel sheets (20) are opened in one direction; the hollow inserting groove (19) is fixed between the adjacent I-shaped steels (16) through four fixing arms (18) arranged at the upper end and the lower end;
the height and the thickness of the arch-type frame structure (2) are smaller than the size of the inner wall of the hollow inserting groove (19), the arch-type frame structure (2) is inserted into the wall rear soil body from the inside of the foundation pit (1) through the middle hole inserting groove (19), and the vertical rod (5) is fixed inside the hollow inserting groove (19).
7. The construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmotic drainage function according to claim 1, comprising the steps of:
s1, foundation pit design and construction preparation: designing the size and the depth of a foundation pit (1) according to engineering requirements, leveling the ground, completing measurement and positioning work on the ground surface in advance, and well performing precipitation work;
s2, component design and preparation: the number of reinforcing layers is determined according to the depth of the foundation pit (1), the height of the arch frame structure (2) is designed according to the height between two adjacent layers of steel enclosing purlins (13), and the number of layers of the I-steel connecting pieces (17) is the same as the number of reinforcing layers of the foundation pit (1); the subsequent arch frame structure (2) with the corresponding size, the steel purlin (13), the steel support (14), the I-steel (16) and the I-steel connecting piece (17) to be used are prefabricated in advance by a factory and are prepared before construction;
s3, constructing a triaxial stirring pile wall: moving the triaxial mixing pile machine to a design position, sequentially driving the triaxial mixing piles, and sequentially completing the insertion of I-shaped steel (16) and I-shaped steel connecting pieces (17) before the pile body is hardened; after the construction is finished, marking the position where the I-shaped steel connecting piece (17) is embedded, and marking the position of the corresponding hollow inserting groove (19);
s4, excavation and reinforcement of the foundation pit 1: after the triaxial mixing pile wall (15) is hardened to a specified strength, the foundation pit (1) is excavated in layers according to the design depth, all arch-type frame structures (2) of the layer are installed, and a steel purlin (13) and a steel support (14) are installed at the bottom of each layer for reinforcement;
s5, connecting the device and injecting an electroosmosis promoting liquid: then, a plastic hose is used for connecting a water outlet pipe (10) at the lower part of each arch-type frame structure (2), and arch power interfaces (7) of the left and right adjacent arch-type frame structures (2) are respectively connected with the positive pole and the negative pole of a direct-current power supply, so that the arches (3) of the adjacent arch-type frame structures (2) respectively become a positive pole and a negative pole; then, injecting electroosmosis promoting liquid by using a water outlet pipe (10) on the anode arch type frame structure (2) so that the electroosmosis promoting liquid is injected into the surrounding soil body through a drainage channel (22) and a drainage hole (11); turning on a power supply to enable the electroosmosis liquid around the arch-shaped frame structures (2) of the original anode to flow to the cathode, and turning off the power supply after the electroosmosis liquid uniformly permeates between the adjacent arch-shaped frame structures (2);
s6, draining water behind the foundation pit wall: connecting the positive pole of a power supply with a vertical pole power supply interface (8) of each arch frame structure (2), connecting the negative pole of the power supply with an arch power supply interface (7) of each arch frame structure (2), enabling each vertical pole (5) to become an electroosmosis anode, enabling each arch frame (3) to become an electroosmosis cathode, after the power supply is turned on, enabling underground water close to the side wall of the foundation pit (1) to flow to the vicinity of the arch frame (3) under the action of an electric field, enabling the underground water to enter an internal drainage channel (22) through a drainage hole (11) reserved in the arch frame (3), and finally discharging the underground water out of the foundation pit (1) through a water outlet pipe (10);
s7, continuous excavation and deformation monitoring of the foundation pit: continuously downwards excavating the foundation pit (1), after excavating to a specified depth, repeating the steps S (4), S (5) and S (6) to complete the installation and use of the arch-shaped frame structure (2), the steel purlin (13) and the steel support (14), and when excavating the lower-layer foundation pit (1), synchronously performing drainage work behind the upper wall to monitor the deformation condition of the side wall of the foundation pit (1);
s8, subsequent ending work: and after the integral structure of the foundation pit (1) is constructed and stabilized, the recycled steel purlin (13) and the steel support (14) are dismantled.
8. The construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmotic drainage function according to claim 7, wherein in step S3: i-steel (16) is continuously driven in each triaxial mixing pile, and I-steel connecting pieces (17) are driven at intervals; in the inserting process, I-shaped steel (16) and I-shaped steel connecting pieces (17) are vertically inserted into the triaxial mixing pile wall (15), and fixing arms (18) on two sides of the I-shaped steel connecting pieces (17) are overlapped in the I-shaped steel (16).
9. The construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmotic drainage function according to claim 7, wherein in step S4: when the depth of the bottom of each two layers is dug to a specified depth, the position where the I-shaped steel connecting piece (17) is embedded in advance is found; the reinforced soil on the surface of the hollow inserting groove (19) is stripped in advance, the surface rust prevention treatment is carried out on the arch type frame structure (2) prefabricated and assembled in advance, and then the arch type frame structure (2) is inserted into the hollow inserting groove (19), so that the vertical rod (5) is fixed in the hollow inserting groove (19).
10. The construction method of the deep and large foundation pit side wall reinforcing structure with the electro-osmotic drainage function according to claim 7, wherein in step S7: when the deformation value of the side wall of a certain position is detected to be overlarge in the excavation process of the foundation pit (1), grouting is performed by using a reserved grouting opening (9) on the arch type frame structure (2); the grout is injected into the soil body from the grout outlet hole (12) on the surface of the support rod (4) through the grouting channel (24) to perform grouting reinforcement on the surrounding soil body.
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