CN115045299B - Deep foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method - Google Patents
Deep foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method Download PDFInfo
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- CN115045299B CN115045299B CN202210885144.4A CN202210885144A CN115045299B CN 115045299 B CN115045299 B CN 115045299B CN 202210885144 A CN202210885144 A CN 202210885144A CN 115045299 B CN115045299 B CN 115045299B
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- 238000005370 electroosmosis Methods 0.000 title claims abstract description 48
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 27
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 138
- 239000010959 steel Substances 0.000 claims abstract description 138
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 230000001737 promoting effect Effects 0.000 claims abstract description 18
- 230000005684 electric field Effects 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 101150054854 POU1F1 gene Proteins 0.000 claims description 31
- 239000002689 soil Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 10
- 238000009412 basement excavation Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000012466 permeate Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000001556 precipitation 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
- 230000002265 prevention Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000011440 grout Substances 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000007569 slipcasting Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- 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 foundation pit side wall reinforcing structure with an electroosmosis drainage function and a construction method, comprising the following steps: foundation pit design and construction preparation; designing and preparing a component; setting a triaxial stirring pile wall; digging and reinforcing a foundation pit; connecting the devices and injecting electroosmotic liquid; draining water behind the foundation pit wall; continuously excavating and monitoring deformation of the foundation pit; and (5) subsequent ending work. The beneficial effects of the invention are as follows: the arch-shaped frame structure, the I-steel connecting piece and the I-steel form a stressed whole, and meanwhile, the steel purlin and the steel support are matched, so that the stability of the structure is effectively improved; the insulating connecting piece is used for insulating treatment, the electroosmosis drainage range is enlarged by promoting electroosmosis liquid, underground water is collected around the arch frame by utilizing the action of an electric field, and finally the underground water is discharged out of the foundation pit; the grouting opening and the grouting channel are reserved, so that the rapid grouting operation when the foundation pit is excessively deformed can be realized; each component is prefabricated in advance, so that 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 electroosmosis drainage function and a construction method.
Background
Along with the increasing shortage of urban underground space, the excavation of a deep and large foundation pit often causes disturbance to adjacent pile foundations, tunnels and the like; on the other hand, because the excavation depth of the foundation pit is large, groundwater in the soil body behind the wall easily affects the foundation pit, so that the side wall of the foundation pit leaks water, deforms and even collapses. Therefore, the foundation pit is supported timely and stably in the excavation process, and meanwhile, the groundwater outside the foundation pit is discharged timely and critically.
Traditional foundation ditch support reinforcement technique includes modes such as support reinforcement in the foundation ditch, promotion fender post intensity. The inner support reinforcing structures are connected simply, the stability is poor, and certain potential safety hazards exist; the mode of increasing the strength of the fender post has limited effect on improving the deformation resistance of the side wall, and the cost is greatly increased.
Aiming at the problem of groundwater, the traditional treatment method comprises the steps of setting a water stop wall and dewatering a foundation pit. The water stop wall is generally formed by piling and pouring a triaxial stirring pile driver, offset is easy to generate, gaps are generated, groundwater is caused to flow into a foundation pit along the gaps together with sand, piping is generated, and risks are caused; the foundation pit dewatering method comprises various technologies, and the effect is different.
In summary, the existing foundation pit support and precipitation measures have the disadvantages of poor stability, limited control effect, high cost and the like, and the problems need to be solved by improved technology.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a deep foundation pit side wall reinforcing structure with an electroosmosis drainage function and a construction method.
This kind of contain dark foundation ditch lateral wall reinforced structure of electroosmosis drainage function, its characterized in that includes: foundation pit, arch frame structure, steel purlin, steel support and triaxial stirring pile wall;
the side wall of the foundation pit is provided with a triaxial stirring pile wall, a plurality of layers of steel purlins and steel supports are arranged in the side wall of the foundation pit, the steel supports are arranged between the steel purlins, and a plurality of arch-shaped frame structures are arranged between every two adjacent steel purlins;
the arch frame structure comprises an arch frame and vertical rods, wherein the arch frame is semicircular, and the upper end and the lower end of the vertical rods are connected with the two ends of the arch frame; a plurality of support rods are horizontally arranged between the arch centering and the vertical rods, and inclined rods are obliquely connected between the support rods; wires are buried in the arch frame and the vertical rod; insulating connecting pieces are arranged at the connecting parts among the arch centering, the supporting rods, the vertical rods and the diagonal rods;
i-steel is continuously arranged in the triaxial mixing pile wall, adjacent I-steel is connected through an I-steel connecting piece, and a hollow An Chacao is arranged in the center of the I-steel connecting piece; the arch frame structure is inserted into the earth behind the wall through the hollow An Chacao.
As preferable: the electric wires in the arch centering are buried at one side, far away from the vertical rod, outside the drainage channel; the electric wires in the vertical rods are buried outside the grouting channel and are far away from one side of the arch center; the electric wires inside the arch frame and the vertical rod are respectively connected with the arch frame power interface and the vertical rod power interface.
As preferable: the cross section of the arch frame 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; a plurality of circular drain holes are arranged on the pipe wall of one side of the arch centering, which is close to the vertical rod, and the pipe walls of the two adjacent sides at equal intervals, the circular drain holes are connected with the drain channel, and the orifices of the circular drain holes are provided with filter screens.
As preferable: the support rod is internally provided with a hollow pipeline and is communicated with the outer surface through slurry outlets which are arranged on the surface at equal intervals; the inside center of montant sets up the slip casting passageway, and slip casting passageway and the inside hollow pipeline intercommunication of every bracing piece.
As preferable: protruding bolts are arranged at two ends of the insulating connecting piece, and threads are arranged on the surfaces of the bolts; bolt holes corresponding to the threads are reserved on the vertical rods and the arch centering, and the sections at the two ends of the insulating connecting piece are cambered surfaces attached to the surfaces of the components.
As preferable: the I-steel connecting pieces are arranged into a multi-layer structure, and the center of each layer of I-steel connecting piece is provided with a hollow An Chacao; the notch positions at the two ends of the hollow inserting groove are provided with blocking steel sheets which are opened in one direction; the hollow mounting slot is fixed between the adjacent I-steel through four fixing arms arranged at the upper end and the lower end;
the height and thickness of the arch-type frame structure are smaller than the inner wall of the hollow safety slot, the arch-type frame structure is inserted into soil body after the wall of the foundation pit through the middle Kong Ancha slot, and the vertical rods are fixed inside the hollow safety slot.
The construction method of the deep foundation pit side wall reinforcing structure with the electroosmosis drainage function comprises the following steps of:
s1, foundation pit design and construction preparation: designing the size and depth of a foundation pit according to engineering requirements, leveling a field, completing measurement and positioning work on the ground surface in advance, and performing precipitation work;
s2, component design and preparation: determining the number of reinforcement layers according to the depth of the foundation pit, and designing the height of an arch-shaped frame structure according to the height between two adjacent layers of steel purlins, wherein the number of I-steel connectors is the same as the number of reinforcement layers of the foundation pit; the arch-shaped frame structure, the steel purlin, the steel support, the I-steel and the I-steel connecting piece with corresponding sizes for later use are prefabricated in advance by factories, and are prepared properly before construction;
s3, setting a triaxial stirring pile wall: moving the triaxial mixing pile machine to a designed position, sequentially driving triaxial mixing piles, and completing insertion of the I-steel and the I-steel connecting piece before hardening the pile body; marking the position of the embedded I-steel connecting piece after finishing construction, and marking the position of the corresponding hollow installation slot;
s4, excavating and reinforcing a foundation pit: after the triaxial stirring pile wall is hardened to the specified strength, carrying out layered excavation on the foundation pit according to the designed depth, installing all arch-type frame structures of the layers, and installing a steel enclosing purlin and a steel support at the bottom of each layer for reinforcement;
s5, connecting equipment and injecting electroosmosis promoting liquid: then, connecting the water outlet pipe at the lower part of each arch-shaped frame structure by using a plastic hose, wherein arch-shaped frame power interfaces of the left and right adjacent arch-shaped frame structures are respectively connected with the positive electrode and the negative electrode of a direct-current power supply, so that arches of the adjacent arch-shaped frame structures are respectively an anode and a cathode; then, electroosmosis promoting liquid is injected by utilizing a water outlet pipe on the anode arch type frame structure, so that the electroosmosis promoting liquid is injected into surrounding soil through a drainage channel and a drainage hole; the power supply is turned on, so that electroosmosis promoting liquid around the original anode arch frame structure flows to the cathode, and the power supply is turned off after the electroosmosis promoting liquid uniformly permeates between the adjacent arch frame structures;
s6, draining water after the foundation pit wall: connecting a power supply anode with a vertical rod power supply interface of each arch-type frame structure, connecting a power supply cathode with an arch-type frame structure power supply interface of each arch-type frame structure, enabling each vertical rod to be an electroosmosis anode, enabling each arch to be an electroosmosis cathode, enabling groundwater near the side wall of a foundation pit to flow to the vicinity of the arch under the action of an electric field after the power supply is turned on, enabling the groundwater to enter an internal drainage channel through a drainage hole reserved in the arch, and finally discharging the groundwater out of the foundation pit through a water outlet pipe;
s7, continuously excavating and monitoring deformation of the foundation pit: continuously excavating a foundation pit downwards, repeating the steps S4, S5 and S6 to complete the installation and the use of an arch-shaped frame structure, a steel purlin and a steel support after the foundation pit is excavated to a designated depth, synchronously performing the drainage work after the upper wall is excavated, and closely monitoring the deformation condition of the side wall of the foundation pit;
s8, subsequent ending work: and after the foundation pit integral structure is constructed and stabilized, dismantling the recovered steel purlin and the steel support.
Preferably, in step S3: the I-steel is continuously applied in each triaxial mixing pile, and the I-steel connecting pieces are applied at intervals; in the inserting process, the I-steel and the I-steel connecting piece are vertically inserted into the triaxial stirring pile wall, and meanwhile, the fixing arms on two sides of the I-steel connecting piece 17 are lapped in the I-steel.
Preferably, in step S4: when the two layers of the steel plates are dug to the appointed depth of the bottom of each layer, finding the position where the I-steel connecting piece is buried in advance; the reinforced soil on the surface of the hollow safety slot is stripped in advance, the surface rust prevention treatment is carried out on the arch-shaped frame structure prefabricated and assembled in advance, and then the arch-shaped frame structure is inserted into the hollow An Chacao, so that the vertical rod 5 is fixed in the hollow safety slot.
Preferably, in step S7: when the deformation value of the side wall at a certain position is detected to be too large in the foundation pit excavation process, grouting is carried out by utilizing a grouting opening reserved on the arch-shaped frame structure; the slurry is injected into the soil body through the slurry injection channel from the slurry outlet on the surface of the support rod, so as to perform grouting reinforcement on the surrounding soil body.
The beneficial effects of the invention are as follows:
1) According to the invention, 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 stirring pile wall, so that a stressed whole is formed, and the strength of the side wall is effectively improved; meanwhile, the steel purlin is matched with the steel support for use, so that the stability of the structure is improved, and the deformation resistance is enhanced.
2) According to the invention, each part of the arch-type frame structure is insulated by using the insulating connecting piece, and the positive and negative electrodes of the power supply are connected, so that the whole vertical rod is used as an anode, the whole arch frame is used as a cathode, underground water is far away from the side wall of the foundation pit under the action of an electric field and is collected around the arch frame, and then the underground water is discharged out of the foundation pit through the drain hole, the drain channel and the water outlet pipe, so that the effects of reinforcing soil body and eliminating the harm of the underground water are achieved; and the electroosmosis liquid is injected before electroosmosis drainage, so that the electroosmosis drainage range is enlarged, and the drainage effect is effectively improved.
3) The structure of the invention is reserved with the grouting opening and the grouting channel, which can realize the rapid grouting operation when the foundation pit is excessively deformed, and the slurry is uniformly filled into the soil around the rear wall, thereby playing the roles of reinforcing the soil and effectively preventing the further development of deformation.
4) The construction parts are prefabricated and assembled in advance by factories, and the construction site can be installed and used after simple treatment, so that the construction method is convenient and quick to operate, can reduce field work errors, ensure engineering quality and can effectively shorten the construction period.
Drawings
FIG. 1 is a schematic front view of the overall structure of the present invention;
FIG. 2 is a schematic illustration of the installation of adjacent arch frame structures of the foundation pit side walls;
FIG. 3 is an overall schematic 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 rod B-B of FIG. 3;
FIG. 6 is a three-dimensional schematic view of a I-steel connector;
FIG. 7 is a schematic view of the mounting location of the I-steel coupler;
FIG. 8 is a schematic view of an installation process of an arch frame structure;
FIG. 9 is a schematic view of the diffusion direction of electroosmotic liquid in the earth;
FIG. 10 is a schematic illustration of electroosmotic drainage;
fig. 11 is a schematic view of grouting reinforcement.
Reference numerals illustrate: foundation pit 1, arch frame structure 2, arch 3, bracing piece 4, montant 5, insulating connecting piece 6, arch power interface 7, montant power interface 8, slip casting mouth 9, outlet pipe 10, wash port 11, play thick liquid hole 12, steel enclose purlin 13, steel support 14, triaxial stirring stake wall 15, I-steel 16, I-steel connecting piece 17, fixed arm 18, cavity and install slot 19, separation steel sheet 20, electric wire 21, drainage channel 22, filter screen 23, slip casting passageway 24, diagonal rod 25.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
As an embodiment, as shown in fig. 1 to 11, the deep foundation pit side wall reinforcing structure with electroosmosis drainage function comprises a foundation pit 1, an arch frame structure 2, an arch 3, a supporting rod 4, a vertical rod 5, an insulating connecting piece 6, an arch power interface 7, a vertical rod power interface 8, a grouting opening 9, a water outlet pipe 10, a drainage hole 11, a grouting hole 12, a steel enclosing purlin 13, a steel support 14, a triaxial stirring pile wall 15, an i-steel 16, an i-steel connecting piece 17, a fixing arm 18, a hollow safety 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, a foundation pit 1 is enclosed by adopting a triaxial stirring pile wall 15, and multiple layers of reinforcing structures are arranged according to depth, each layer of reinforcing structure comprises steel enclosing purlins 13 and steel supports 14 arranged on the side walls of the foundation pit 1, and an arch-type frame structure 2 is arranged in a soil body behind the wall between the upper layer and the lower layer of adjacent steel enclosing purlins 13 to play roles in reinforcing and draining.
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 are arranged vertically adjacently, and the arch frame structures 2 adjacent to each other vertically 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 support rods 4 and two diagonal rods 25 are arranged between the semicircular arch 3 and the vertical rod for reinforcement, so that the whole structure is more stable; both ends of each supporting rod 4 and each diagonal rod 25 are connected to the arch frame 3 and the vertical rods 5 through insulating connecting pieces 6; the arch 3 is a hollow steel pipe, a plurality of groups of drain holes 11 are circumferentially and equidistantly arranged on the surface, a drain channel 22 and an electric wire 21 are arranged in the arch, an arch power interface 7 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 communicated with the drain channel 22; the support rods 4 are horizontally arranged and are hollow steel pipes, a plurality of groups of grouting holes 12 are circumferentially and equidistantly arranged on the surfaces, and grouting channels 24 are arranged in the grouting holes; the inside slip casting passageway 24 and the electric wire 21 that set up of montant 5, slip casting mouth 9 is connected to slip casting passageway 24 upper end, inside three bracing piece 4 inside of intercommunication respectively, and inside electric wire 21 then connects montant power interface 8 of montant 5 upper end.
As shown in fig. 4, the arch 3 is provided with a plurality of groups of drainage sections, the section A-A is a drainage section, the section A-A is a rectangular section, a drainage channel 22 is arranged in the center, an electric wire 21 is embedded in the side wall far away from one side of the vertical rod 5, and the side walls in the other three directions are provided with a drainage hole 11, each drainage hole 11 is cylindrical, and the orifice is provided with a filter screen 23 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 rod 5, and is a rectangular section, a grouting channel 24 is arranged in the center, an electric wire 21 is arranged on one side far away from the arch 3, and a channel connecting support rod 4 is arranged on one side near the arch 3, and the grouting channel 24 is arranged inside.
As shown in fig. 6, the i-steel connecting piece 17 has a double-layer structure, in actual engineering, more layers of structures can be designed according to the depth of the foundation pit 1, each layer of main structure of the i-steel connecting piece 17 is hollow An Chacao 19, and the size of the main structure is slightly larger than the height and thickness of the arch frame structure 2, so that the arch frame structure 2 can pass through; four fixing arms 18 are arranged at the upper end and the lower end of the hollow mounting groove 19 and used for fixing the whole I-steel connecting piece 17 between the adjacent I-steels 16.
As shown in fig. 7, the triaxial mixing pile wall 15 is formed by overlapping a triaxial mixing pile, each triaxial mixing pile is inserted with an i-steel 16 in the center, an i-steel connecting piece 17 can be arranged between two adjacent i-steels 16, the i-steel connecting piece 17 is divided into a hollow safety slot 19 and a fixing arm 18, the hollow An Chacao is perpendicular to the triaxial mixing pile wall 15, two ports are respectively provided with a blocking steel sheet 20, the soil outside the foundation pit 1 is prevented from entering the hollow safety 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 body behind the triaxial stirring pile wall 15 wall through the hollow An Chacao 19 on the i-steel connecting piece 17, and the vertical rod 5 position can be just fixed inside the hollow installation slot 19 and is tightly attached.
As shown in fig. 9, before electroosmosis drainage, the arch frame power supply interfaces 7 of the adjacent arch frame structures 2 are respectively connected with the positive electrode and the negative electrode of the power supply, so that the arches 3 on the adjacent arch frame structures 2 are respectively anode electrodes and cathode electrodes, electroosmosis promoting liquid is injected into the water outlet pipes 10 corresponding to the anode arches 3, the electroosmosis promoting liquid passes through the drainage channels 22, is injected into surrounding soil bodies from the drainage holes 11, and gradually permeates into the vicinity of the negative electrode from the anode under the action of an electric field, and after the electroosmosis promoting liquid uniformly permeates into surrounding soil layers, the power supply is turned off to complete the process.
As shown in fig. 10, before electroosmosis drainage, the positive electrode of the power supply is required to be connected with the vertical rod power supply interface 8, the negative electrode of the power supply is connected with the arch frame power supply interface 7, the vertical rod 5 and the arch frame 3 are respectively made into an electroosmosis anode and a cathode, then the soil water near the side wall of the foundation pit 1 can permeate around the cathode arch frame 3 under the action of an electric field, enters into the internal drainage channel 22 through the drainage hole 11 arranged on the arch frame 3, finally is discharged out of the foundation pit 1 through the water outlet pipe 10, and a plurality of arch frame structures 2 can be reasonably distributed on the side wall of the foundation pit 1 for joint use, thereby improving the overall drainage effect and eliminating the damage of underground water to the deformation of the foundation pit 1.
As shown in fig. 11, if the deformation of a certain place of the foundation pit 1 is too large, the grouting can be quickly reinforced through the grouting openings 9, the slurry can flow along the grouting channels 24 and is injected into the soil body behind the wall through the grouting holes 12, so that the whole arch frame structure 2 and the surrounding soil body are connected into a whole reinforcing body, the anchoring effect is enhanced, and the deformation of the foundation pit 1 is controlled.
Example two
According to the deep foundation pit side wall reinforcing structure with electroosmosis drainage function provided in the first embodiment, the second embodiment provides a construction method of the deep foundation pit side wall reinforcing structure with electroosmosis drainage function, which comprises the following steps:
s1, designing and constructing preparation of a foundation pit 1: the size and depth of the foundation pit 1 are designed according to engineering requirements, the field is leveled, measurement and positioning work is finished on the ground surface in advance, and precipitation work is finished.
S2, component design and preparation: the number of reinforcement layers is determined according to the depth of the foundation pit 1, the height of the arch-type frame structure 2 is designed according to the height between the upper layer steel purlin 13 and the lower layer steel purlin 13, the number of I-steel connecting pieces 17 is the same as that of the foundation pit 1, the width and the height of each hollow installation slot 19 are slightly larger than those of the arch-type frame structure 2, the arch-type frame structure 2 can penetrate through the hollow An Chacao 19, vertical rods 5 can be fixed in the hollow installation slots 19, the arch-type frame structure 2, the steel purlin 13, the steel support 14, the I-steel 16 and the I-steel connecting pieces 17 with the corresponding sizes for later use are prefabricated in advance by factories, and the construction is prepared properly.
S3, setting a triaxial stirring pile wall 15: the triaxial mixing pile machine is moved to a design position, triaxial mixing piles are sequentially driven, insertion of the I-steel 16 and the I-steel connecting pieces 17 is sequentially completed before the pile body is hardened, the I-steel 16 is continuously driven in each triaxial mixing pile, the I-steel connecting pieces 17 are driven at intervals, the specific density degree is designed in advance according to the earlier engineering requirements and hydrogeological conditions, the inclination degree needs to be strictly measured and controlled in the insertion process, the I-steel 16 and the I-steel connecting pieces 17 can be vertically inserted into the triaxial mixing pile wall 15, meanwhile, the mounting direction of the I-steel connecting pieces 17 needs to be ensured to be correct, fixing arms 18 on two sides are overlapped in the I-steel 16, and marks are made on the positions of the embedded I-steel connecting pieces 17 after the construction is completed and the positions of corresponding hollow installation slots 19 are marked.
S4, excavating and reinforcing the foundation pit 1: after the triaxial stirring pile wall 15 is hardened to the appointed intensity, the foundation pit 1 is excavated in a layered mode according to the designed depth, when the appointed depth of every two layers of bottoms is excavated, the position of the pre-buried I-steel connecting piece 17 is found, a small amount of reinforcing soil on the surface of the hollow installation slot 19 is stripped in advance, the surface rust prevention treatment is carried out on the arch-shaped frame structure 2 prefabricated and assembled in advance factory, the arch-shaped frame structure 2 is vertically and slowly inserted into the hollow installation slot 19, the whole arch-shaped frame structure 2 enters the soil body after the wall, the vertical rods 5 are fixed in the hollow installation slot 19, and then the steel purlin 13 and the steel support 14 are installed at the bottom of each layer to be reinforced.
S5, connecting equipment and injecting electroosmosis promoting liquid: the above steps are repeated to complete the installation of all arch frame structures 2, then the plastic hose is used to connect the water outlet pipe 10 at the lower part of each arch frame structure 2, the arch frame power interfaces 7 of the left and right adjacent arch frame structures 2 are respectively connected with the positive pole and the negative pole of the direct current power source, the arches 3 of the adjacent arch frame structures 2 become the positive pole and the negative pole respectively, then electroosmosis promoting liquid is injected by the water outlet pipe 10 on the anode arch frame structures 2 and injected into the surrounding soil body through the water outlet channel 22 and the water outlet holes 11, under the action of an electric field, the electroosmosis promoting liquid around the original anode arch frame structures 2 slowly flows to the negative pole, and after the electroosmosis promoting liquid uniformly permeates between the adjacent arch frame structures 2, the power source is turned off.
S6, draining water behind the foundation pit 1 wall: the positive electrode of a power supply is connected with the vertical rod power supply interface 8 of each arch-type frame structure 2, the negative electrode of the power supply is connected with the arch-type power supply interface 7 of each arch-type frame structure 2, each vertical rod 5 is made to be an electroosmosis anode, each arch 3 is made to be an electroosmosis cathode, after the power supply is turned on, the soil water close to the side wall of the foundation pit 1 flows to the vicinity of the arch 3 under the action of an electric field, and the water drain hole 11 reserved on the arch 3 enters the internal water drain channel 22 and is finally discharged out of the foundation pit 1 through the water outlet pipe 10, so that the purpose of stabilizing the soil body behind the wall is achieved.
S7, continuously excavating and monitoring deformation of the foundation pit 1: continuously excavating the foundation pit 1 downwards, repeating the steps S4, S5 and S6 to finish the installation and the use of the arch-shaped frame structure 2, the steel purlin 13 and the steel support 14 after the foundation pit 1 is excavated to a designated depth, synchronously carrying out the water drainage work behind the upper wall when the foundation pit 1 at the lower layer is excavated, and closely monitoring the deformation condition of the side wall of the foundation pit 1; if the deformation value of the side wall of a certain position is too large in the process of excavating the foundation pit 1, grouting is performed by utilizing the grouting openings 9 reserved on the arch-shaped frame structure 2, the slurry is injected into the soil body through the grouting channels 24 at the positions of the grouting holes 12 circumferentially arranged on the surface of the support rods 4, grouting reinforcement is performed on the surrounding soil body, the stability is increased, and further deformation of the foundation pit 1 is controlled.
S8, subsequent ending work: after the whole structure of the foundation pit 1 is finished and stabilized, the recycled steel purlin 13 and the steel support 14 are removed.
Claims (7)
1. The utility model provides a contain dark foundation ditch lateral wall reinforced structure of electroosmosis drainage function which characterized in that includes: the device comprises a foundation pit (1), an arch-shaped frame structure (2), a steel purlin (13), a steel support (14) and a triaxial stirring pile wall (15);
the side wall of the foundation pit (1) is provided with a triaxial stirring pile wall (15), a plurality of layers of steel purlins (13) and steel supports (14) are arranged in the side wall of the foundation pit (1), the steel supports (14) are arranged between the steel purlins (13), and a plurality of arch-shaped frame structures (2) are arranged between every two adjacent steel purlins (13);
the arch-type frame structure (2) comprises an arch (3) and vertical rods (5), the arch (3) is semicircular, and the upper end and the lower end of the vertical rods (5) are connected with the two ends of the arch (3); a plurality of support rods (4) are horizontally arranged between the arch centering (3) and the vertical rods (5), and inclined rods (25) are obliquely connected between the support rods (4); the electric wires (21) are buried in the arch (3) and the vertical rod (5); the connection parts among the arch centering (3), the supporting rod (4), the vertical rod (5) and the diagonal rod (25) are provided with insulating connecting pieces (6); the cross section of the arch (3) is a hollow rectangular cross section, the center of the cross section is 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 arranged on the pipe wall of one side, close to the vertical rods (5), of the arch frame (3) and two adjacent sides at equal intervals, the circular drain holes (11) are connected with a drain channel (22), and a filter screen (23) is arranged at the orifice of each circular drain hole (11); the support rod (4) is internally provided with a hollow pipeline and is communicated with the outer surface through slurry outlets (12) which are arranged on the surface at equal intervals; a grouting channel (24) is arranged in the center of the inside of the vertical rod (5), the upper end of the grouting channel (24) is connected with a grouting port (9), and the grouting channel (24) is communicated with a hollow pipeline in each supporting rod (4); the electric wire (21) in the arch (3) is buried outside the drainage channel (22) at one side far away from the vertical rod (5); the electric wire (21) in the vertical rod (5) is buried outside the grouting channel (24) and is far away from one side of the arch (3); the electric wires (21) inside the arch (3) and the vertical rod (5) are respectively connected with the arch power interface (7) and the vertical rod power interface (8)
I-steel (16) is continuously arranged in the triaxial stirring pile wall (15), adjacent I-steel (16) are connected through I-steel connecting pieces (17), and a hollow An Chacao (19) is arranged in the center of each I-steel connecting piece (17); the arch-type frame structure (2) is inserted into the soil body behind the wall through the hollow An Chacao (19).
2. The deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, wherein: protruding bolts are arranged at two ends of the insulating connecting piece (6), and threads are arranged on the surfaces of the bolts; bolt holes corresponding to the threads are reserved on the vertical rods (5) and the arch frames (3), and the sections of the two ends of the insulating connecting piece (6) are cambered surfaces attached to the surfaces of the components.
3. The deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, wherein: the I-steel connecting pieces (17) are of a multi-layer structure, and the center of each layer of I-steel connecting piece (17) is provided with a hollow An Chacao (19); the two ends of the hollow An Chacao (19) are provided with baffle steel sheets (20), and the baffle steel sheets (20) are opened in one direction; the hollow An Chacao (19) is fixed between the adjacent I-steel (16) through four fixing arms (18) arranged at the upper end and the lower end;
the height and thickness of the arch-shaped frame structure (2) are smaller than the inner wall of the hollow An Chacao (19), the arch-shaped frame structure (2) is inserted into a soil body behind the wall from the inside of the foundation pit (1) through the middle Kong Ancha groove (19), and the vertical rods (5) are fixed inside the hollow An Chacao (19).
4. The construction method of the deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 1, which is characterized by comprising the following steps:
s1, foundation pit design and construction preparation: designing the size and depth of a foundation pit (1) according to engineering requirements, leveling a field, completing measurement and positioning work on the ground surface in advance, and performing precipitation work;
s2, component design and preparation: the number of reinforcement layers is determined according to the depth of the foundation pit (1), the height of the arch-shaped frame structure (2) is designed according to the height between the upper and lower adjacent steel purlins (13), and the number of I-steel connecting pieces (17) is the same as the number of reinforcement layers of the foundation pit (1); the arch-shaped frame structure (2), the steel purlin (13), the steel support (14), the I-steel (16) and the I-steel connecting piece (17) with corresponding sizes for later use are prefabricated in advance by factories, and are prepared properly before construction;
s3, setting a triaxial stirring pile wall: moving the triaxial mixing pile machine to a designed position, sequentially driving triaxial mixing piles, and completing the insertion of the I-steel (16) and the I-steel connecting piece (17) before hardening the pile body; after the construction is finished, marking the position of the embedded I-steel connecting piece (17) and marking the position of the corresponding hollow An Chacao (19);
s4, excavating and reinforcing the foundation pit 1: after the triaxial stirring pile wall (15) is hardened to the designated strength, carrying out layered excavation on the foundation pit (1) according to the designed depth, installing all arch-type frame structures (2) of the layers, and installing a steel enclosing purlin (13) and a steel support (14) at the bottom of each layer for reinforcement;
s5, connecting equipment and injecting electroosmosis promoting liquid: then, a plastic hose is used for connecting a water outlet pipe (10) at the lower part of each arch-shaped frame structure (2), and arch-shaped power supply interfaces (7) of the left and right adjacent arch-shaped frame structures (2) are respectively connected with the positive pole and the negative pole of a direct-current power supply, so that arches (3) of the adjacent arch-shaped frame structures (2) are respectively an anode and a cathode; then, electroosmosis promoting liquid is injected by utilizing a water outlet pipe (10) on the anode arch frame structure (2), so that the electroosmosis promoting liquid is injected into surrounding soil through a drainage channel (22) and a drainage hole (11); the power supply is turned on, so that electroosmosis promoting liquid around the original anode arch-type frame structure (2) flows to the cathode, and the power supply is turned off after the electroosmosis promoting liquid uniformly permeates between the adjacent arch-type frame structures (2);
s6, draining water after the foundation pit wall: connecting a power supply anode with a vertical rod power supply interface (8) of each arch-shaped frame structure (2), connecting a power supply cathode with an arch-shaped frame power supply interface (7) of each arch-shaped frame structure (2), enabling each vertical rod (5) to be an electroosmosis anode, enabling each arch (3) to be an electroosmosis cathode, enabling groundwater close to the side wall of a foundation pit (1) to flow to the vicinity of the arch (3) under the action of an electric field after the power supply is turned on, enabling the groundwater to enter an internal drainage channel (22) through a drainage hole (11) reserved in the arch (3), and finally discharging the groundwater out of the foundation pit (1) through a water outlet pipe (10);
s7, continuously excavating and monitoring deformation of the foundation pit: continuously excavating a foundation pit (1) downwards, repeating the steps S4, S5 and S6 to finish the installation and the use of the arch-shaped frame structure (2), the steel purlin (13) and the steel support (14) after the foundation pit (1) is excavated to a specified depth, and synchronously performing drainage work behind the upper wall when excavating a lower foundation pit (1), and monitoring the deformation condition of the side wall of the monitoring foundation pit (1);
s8, subsequent ending work: and after the integral structure of the foundation pit (1) is completely constructed and stabilized, dismantling the recovered steel purlin (13) and the steel support (14).
5. The construction method of the deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 4, wherein in step S3: the I-steel (16) is continuously applied in each triaxial mixing pile, and the I-steel connecting pieces (17) are applied at intervals; in the inserting process, the I-steel (16) and the I-steel connecting piece (17) are vertically inserted into the triaxial stirring pile wall (15), and meanwhile, the fixing arms (18) on two sides of the I-steel connecting piece (17) are lapped in the I-steel (16).
6. The construction method of the deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 4, wherein in step S4: when the two layers of the steel plates are dug to the appointed depth of the bottom of each layer, the position of the pre-buried I-steel connecting piece (17) is found; the reinforced soil on the surface of the hollow An Chacao (19) is stripped in advance, the surface rust prevention treatment is carried out on the arch-shaped frame structure (2) prefabricated and assembled in advance in a factory, and then the arch-shaped frame structure (2) is inserted into the hollow An Chacao (19), so that the vertical rod (5) is fixed in the hollow An Chacao (19).
7. The construction method of the deep foundation pit side wall reinforcing structure with electroosmosis drainage function according to claim 4, wherein in step S7: when the deformation value of the side wall at a certain position is detected to be too large in the excavation process of the foundation pit (1), grouting is carried out by utilizing a grouting opening (9) reserved on the arch-shaped frame structure (2); the grout is injected into the soil body through the grouting channel (24) at the grout outlet hole (12) on the surface of the supporting rod (4) to perform grouting reinforcement on the surrounding soil body.
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