CN114753382A - Combined portal type foundation pit supporting system and construction method thereof - Google Patents
Combined portal type foundation pit supporting system and construction method thereof Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 239000011435 rock Substances 0.000 claims abstract description 28
- 239000011378 shotcrete Substances 0.000 claims abstract description 22
- 239000002344 surface layer Substances 0.000 claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 claims description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 10
- 239000011440 grout Substances 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 235000019994 cava Nutrition 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000011161 development Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
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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
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Mining & Mineral Resources (AREA)
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Abstract
The invention provides a combined portal foundation pit supporting system and a construction method thereof, and relates to the technical field of deep foundation pit engineering. The combined portal foundation pit supporting system comprises a portal supporting structure, a longitudinal connecting beam, a groutable steel pipe, an anchor rod and a sprayed concrete surface layer. The combined portal support system has the advantages of clear stress system, high rigidity, high stability and high deformation resistance, and is very favorable for controlling the deformation of strata and environment; the self-stability capability of the rock stratum is utilized for supporting, so that the construction quantity of the drilled piles in the rock stratum is reduced, and the construction difficulty is reduced; supporting a shallow soil layer by using a groutable steel pipe, and simultaneously grouting from the ground surface as required to fill karst caves, thereby eliminating the influence of the karst caves on foundation pits and permanent buildings; the construction method has the advantages of clear construction steps, low requirement on site, simple construction process, high construction speed, high economy and remarkable social and economic benefits.
Description
Technical Field
The invention relates to the technical field of deep foundation pit engineering, in particular to a combined portal type foundation pit supporting system and a construction method thereof.
Background
The surrounding of urban deep foundation pit engineering is often built with a plurality of structures and dense municipal pipelines, and the foundation pit construction site is very limited. The deformation requirements of building structures and pipelines around the urban deep foundation pit are generally strict. In order to fully utilize limited site space and meet various requirements, the urban deep foundation pit engineering is constructed by excavating a foundation pit after a vertical supporting structure is constructed.
The method is limited by the development and utilization conditions of urban underground space, and the current deep foundation pit supporting mode in the soil layer mainly adopts a supporting structure combined with an inner support. The main supporting structure has: underground continuous walls, cast-in-place bored piles, bored secant piles, SMW construction method piles, precast concrete piles, Larsen steel plate piles and the like. The first three support modes have high rigidity, deep support depth, large construction machinery and high construction cost, and are suitable for deep foundation pit engineering under various stratum conditions; the last three support modes have small rigidity, shallow support depth, capability of being partially recycled, high construction speed, large construction site requirement and relatively low construction cost, and are suitable for soft soil foundation pits with shallow depth. The supporting structure forms have good application in deep foundation pits of soil layers, but are not suitable for rock stratum foundation pits. Underground continuous walls, bored piles and bored secant piles are difficult to construct in rock strata, high in manufacturing cost and uneconomical, and SMW construction method piles, precast concrete piles and Larsen steel plate piles cannot be constructed in rock strata. The inner support is mainly concrete support and steel pipe support, and the small foundation pit is supported by section steel.
The method is limited by the development and utilization conditions of urban underground space, and the current deep foundation pit supporting mode in a rock stratum mainly comprises the steps of supporting structure combination with inner support and anchor spraying. The main supporting structure has: cast-in-situ bored piles, hanging foot piles, anchor-shotcrete supports and the like. The supporting modes can achieve the purpose of supporting the rock stratum foundation pit, but the bored pile is difficult to construct and high in manufacturing cost, the foot-hanging pile has higher requirements on the integrity degree of the rock stratum and the geological exploration accuracy, and the anchor-jet supporting is only suitable for foundation pit engineering with shallow depth and good rock stratum conditions. The inner support is mainly concrete support and steel pipe support, and the rock stratum is internally supported by bolting and shotcreting.
For a deep foundation pit in a karst polar development area, the deep foundation pit has the characteristics that the rock stratum surface undulation is large, the spatial distribution of the karst caves is difficult to find, the states of fillers in the karst caves are difficult to find, and the like. The deep foundation pit supporting mode adopted in the karst development stratum has a series of problems:
(1) the height fluctuation of the rock layer interface in the range of the foundation pit is irregular, and the construction is difficult and uneconomical by adopting the supporting structure and the inner support with the same depth; the length of the supporting structure is difficult to determine by adopting the supporting structure which changes along with the rock stratum;
(2) the size of the karst cave and the state of the karst cave filler influence the size determination of a supporting structure and the construction of the supporting structure, and the karst cave needs to be treated in advance;
(3) a section with complete rock stratum and a section with karst cave development may exist in one foundation pit at the same time, and the supporting structure is difficult to be considered differently;
(4) the construction of denser bored piles in the complete rock stratum is difficult and uneconomical; the foot-locking anchor cable needs to be arranged on the foot-hanging pile, and the underground space around the foundation pit is affected.
Therefore, a deep foundation pit supporting structure suitable for a karst development area needs to be considered, so that the safety of the foundation pit can be guaranteed, and the economic purpose can be achieved.
Aiming at the deep foundation pit support of a karst area, the currently successful cases all adopt relatively conservative support systems such as cast-in-situ bored piles, foot hanging piles and the like, and the research on the aspects of safety and economy is less. The research and development of a novel deep foundation pit supporting system special for a karst development section has important economic and practical significance for improving the economical efficiency and guaranteeing the engineering safety of similar deep foundation pits. Therefore, a combined portal type foundation pit supporting system and a construction method thereof are provided to solve the problem
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a combined portal foundation pit supporting system and a construction method thereof, which solve the problems that the height fluctuation of a rock stratum interface in the range of a foundation pit is irregular in the prior art, the supporting structure and the inner support with the same depth are difficult and uneconomical to construct, the supporting structure which changes along with the rock stratum is adopted, the length of the supporting structure, the size of a karst cave and the state of a karst cave filler are difficult to determine, the size determination of the supporting structure is influenced, the construction of the supporting structure is influenced, a complete region of the rock stratum and a region where the karst cave develops and a denser bored pile possibly exist in the foundation pit at the same time are difficult and uneconomical to construct in the complete rock stratum; the foot-locking anchor cable is needed to be arranged on the foot-hanging pile, and the underground space around the foundation pit is affected.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a combined portal foundation pit supporting system comprises a portal supporting structure, longitudinal connecting beams, groutable steel pipes, anchor rods and a sprayed concrete surface layer.
Preferably, each truss in the portal supporting structure is composed of two vertical drilling piles and one horizontal supporting beam.
Preferably, the cross section of the vertical drilled pile is circular, the diameter of the cross section is 0.8m to 1.2m, reinforcing steel bars are arranged in the pile, the cross section of the horizontal supporting beam is rectangular, and reinforcing steel bars are arranged in the beam.
Preferably, the upper beam of the longitudinal connecting beam is arranged along the top of the vertical drilled pile and is connected with each roof truss type supporting structure and the groutable steel pipe.
Preferably, the diameter of the steel pipe of the groutable steel pipe is 0.15m to 0.2m, a grout outlet is arranged along the axis of the steel pipe, the diameter of the grout outlet is 10mm, and the distance between the grout outlet is 0.5 m.
Preferably, the anchor rod is a mortar anchor rod, the rod body material of the anchor rod is deformed steel bar with the diameter of 22mm, and the length of the anchor rod is 3.5 m.
Preferably, the surface course in the shotcrete surface course is the wet shotcrete, distributes in the foundation ditch four walls, the shotcrete surface course is located the outside of vertical bored pile, the steel pipe that can slip casting, the thickness of shotcrete surface course 80 mm.
A construction method of a combined door frame type foundation pit supporting system comprises the following construction parts: the first part comprises the construction of vertical drilled piles, the construction of horizontal supporting beams and longitudinal connecting beams, the second part comprises the construction of grouting steel pipes, and the third part comprises the construction of anchor rods and a sprayed concrete surface layer;
s1, construction of the vertical drilled pile: the vertical drilled piles are paired, cast-in-place reinforced concrete is adopted for construction, and the depth of a pile body penetrating into the position below the bottom of a foundation pit is not less than 2 m;
s2, construction of horizontal support beams: cast-in-place reinforced concrete is adopted for construction, and the reinforcing steel bars of the cast-in-place reinforced concrete are mutually anchored with the reinforcing steel bars of the vertical drilled piles 1;
s3, construction of the groutable steel pipe: adopting borehole embedding construction, wherein the top of the borehole is anchored in the longitudinal connecting beam, the top opening of the borehole is 0.3m higher than the longitudinal connecting beam, the bottom of the borehole is anchored in the complete rock stratum, the bottom of the borehole enters the complete rock stratum by 1m, the grouting hole faces the outer side of the foundation pit, and cement mortar is injected from the earth surface after the construction of the steel pipe is finished;
s4, construction of the longitudinal connecting beam: the cast-in-place reinforced concrete is adopted for construction, the steel bars of the cast-in-place reinforced concrete are mutually anchored with the vertical drilled piles and the horizontal supporting beams, and the cast-in-place reinforced concrete, the vertical drilled piles, the horizontal supporting beams and the groutable steel pipes form a whole after construction is completed;
s5, construction of the anchor rod: constructing when the foundation pit is excavated to be close to the bottom of the grouting steel pipe, and welding the end part of the anchor rod with the grouting anchor rod;
s6, construction of the sprayed concrete surface layer: and (5) constructing the foundation pit every time when the depth of the foundation pit is excavated to 2m until the foundation pit is excavated to the designed elevation.
(III) advantageous effects
The invention provides a combined portal type foundation pit supporting system and a construction method thereof. The method has the following beneficial effects:
according to the combined portal frame type supporting system, the structure is clear in stress system, large in rigidity, strong in stability and strong in deformation resistance, and is very beneficial to control of stratum and environmental deformation; the self-stability capability of the rock stratum is utilized for supporting, so that the construction quantity of the drilled piles in the rock stratum is reduced, and the construction difficulty is reduced; supporting a shallow soil layer by using a groutable steel pipe, and simultaneously performing grouting from the ground surface as required to fill a karst cave, thereby eliminating the influence of the karst cave on a foundation pit and a permanent building; the construction method has the advantages of clear construction steps, low requirement on site, simple construction process, high construction speed, high economy and remarkable social and economic benefits.
Drawings
FIG. 1 is a plan view of a door frame type supporting system;
FIG. 2 is a cross-sectional view of a door frame type supporting system;
FIG. 3 is a sectional view of a portal support structure;
FIG. 4 is a sectional view of a groutable steel pipe supporting structure;
FIG. 5 is a treatment diagram of a groutable steel pipe karst cave (node A);
FIG. 6 is a bottom end processing diagram (node B) of a groutable steel pipe;
FIG. 7 is a structural diagram of a groutable steel pipe;
FIG. 8 is a connection diagram of the bored piles and the horizontal support beams of the portal support structure;
FIG. 9 is a connection diagram of a bored pile, a horizontal support beam, a groutable steel pipe and a longitudinal connecting beam.
Wherein, 1, vertically drilling a pile; 2. a horizontal support beam; 3. a longitudinal connecting beam; 4. grouting the steel pipe; 5. an anchor rod; 6. and spraying a concrete surface layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-9, an embodiment of the present invention provides a combined portal foundation pit supporting system, including a portal supporting structure, longitudinal connecting beams 3, steel pipes 4 capable of grouting, anchor rods 5 and a sprayed concrete surface layer 6, where L is a length of a foundation pit L, W, a is a width of the foundation pit, a is a distance between the portal supporting structures, AWEI1 is used for karst cave treatment, and B is a bottom end of the steel pipe capable of grouting, where the combined portal deep foundation pit supporting system is formed by connecting the portal supporting structures and the steel pipes capable of grouting through the longitudinal connecting beams into a whole to achieve vertical supporting of the deep foundation pit, the distance between the portal supporting structures and the distance between the steel pipes capable of grouting need to be calculated and determined according to a soil pressure borne by each supporting structure, a diameter of a vertical bored pile 1 is calculated and determined according to specific geological conditions, a section size of a horizontal supporting beam 2 and a number of reinforcing bars are determined according to a calculation result of the portal supporting structures, the top of the portal type supporting structure is flush with the ground, the lower drilling pile extends 2m below the bottom of a foundation pit, the stability of the portal type supporting structure is guaranteed, the groutable steel pipe 4 is used for supporting and blocking soil outside the pit, when a karst cave or a local soil layer is weak, grouting is conducted through the groutable steel pipe 4, the mortar anchor rod 5 located at the bottom end of the groutable steel pipe 4 is used for limiting horizontal displacement of the lower end of the groutable steel pipe 4, and after a foundation pit is excavated, concrete with the thickness of 80mm is sprayed on the four walls of the foundation pit, so that the overall stability of the supporting system is kept;
each portal type supporting structure consists of two vertical drilling piles 1 and a horizontal supporting beam 2 to form a main stressed component of a supporting system, and has enough strength, rigidity and stability, the section of each vertical drilling pile 1 is circular, the diameter of the section is 0.8-1.2 m, reinforcing steel bars are arranged in the piles, the section of each horizontal supporting beam 2 is rectangular, reinforcing steel bars are arranged in the beams, the upper beam of a longitudinal connecting beam 3 is arranged along the top of each vertical drilling pile 1 and is connected with each portal type supporting structure and a groutable steel pipe 4, the diameter of the steel pipe of each groutable steel pipe 4 is 0.15-0.2 m, a row of grout outlet holes are arranged along the axis of the steel pipe, the diameter of each grout outlet hole is 10mm, the distance between each grout outlet hole is 0.5m, each anchor rod 5 is made of threaded steel with the diameter of 22mm, the length of each anchor rod is 3.5m, wet sprayed concrete is distributed in a sprayed concrete surface layer 6 and distributed on four walls of a foundation pit, the sprayed concrete surface layer 6 is located on the outer sides of the vertical drilled pile 1 and the groutable steel pipe 4, and the thickness of the sprayed concrete surface layer 6 is 80 mm.
Through the above description, the material, characteristics, use, parameter determination method of each member are mainly described.
A construction method of a combined door frame type foundation pit supporting system comprises the following construction parts: the first part includes the construction of vertical bored pile 1, level to supporting beam 2 and longitudinal tie beam 3, and the second part includes the construction of grouting steel pipe 4, and the third part includes the construction of stock 5 and shotcrete surface course 6:
s1, forming a portal support structure with the bottom end embedded in a stable rock stratum and the top rigidly connected with the bottom end by the horizontal support beams 2 in the two vertical bored piles 1 at the two sides of the foundation pit;
s2, grouting steel pipes 4 between every two portal support structures, wherein the tops of the grouting steel pipes 4 are 0.3m higher than the top surface of the longitudinal connecting beam, and the bottoms of the grouting steel pipes 4 are embedded in a stable rock stratum;
s3, horizontally closing the longitudinal connecting beam 3 into a ring, connecting each portal frame type supporting structure and the groutable steel pipe 4, and connecting each component into a foundation pit supporting system to achieve the foundation pit excavation condition;
s4, rigidly connecting the vertical bored piles 1 of the portal support structure with the horizontal support beams 2, and mutually anchoring the reinforcing steel bars of the two members to ensure the strength, rigidity and stability of the portal support structure;
s5, the reinforcing steel bars of the longitudinal connecting beams 3 extend into the door frame type supporting structure for reliable anchoring, the groutable steel pipes 4 penetrate through the longitudinal connecting beams 3, the groutable steel pipes 4 are wrapped in the longitudinal connecting beams 3 when concrete is poured, the grout outlet holes of the groutable anchor rods 5 face the outer side of the foundation pit, and cement mortar is injected from the ground surface after the steel pipe construction penetrating through the karst cave is finished;
and S6, after the portal type foundation pit supporting system is formed, foundation pit excavation is carried out, concrete surface layer 6 is sprayed on the four walls of the foundation pit when the foundation pit is excavated for 2m, when the foundation pit is excavated to the soil-rock boundary surface, mortar anchor rods 5 are arranged on the side edges of each grouting steel pipe 4, and the concrete surface layer 6 is sprayed.
Through the above description, the sequential implementation steps of the components are mainly described, and the portal foundation pit supporting system is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a combination portal formula excavation supporting system which characterized in that: the concrete grouting support comprises a portal support structure, a longitudinal connecting beam (3), a groutable steel pipe (4), an anchor rod (5) and a sprayed concrete surface layer (6).
2. The combination portal foundation pit supporting system of claim 1, wherein: each truss in the portal support structure is composed of two vertical drilling piles (1) and one horizontal support beam (2).
3. The combination door frame foundation pit supporting system of claim 2, wherein: the section form of vertical bored pile (1) is circular, and section diameter 0.8m to 1.2m disposes the reinforcing bar in the stake, the section form of level to a supporting beam (2) is the rectangle, the reinforcing bar in the roof beam.
4. The combination door frame foundation pit supporting system of claim 1, wherein: and the upper beam of the longitudinal connecting beam (3) is arranged along the top of the vertical drilled pile (1) and is connected with each portal supporting structure and the groutable steel pipe (4).
5. The combination door frame foundation pit supporting system of claim 1, wherein: the diameter of the steel pipe of the groutable steel pipe (4) is 0.15-0.2 m, a row of grout outlet holes are arranged along the axis of the steel pipe, the diameter of the grout outlet holes is 10mm, and the distance between the grout outlet holes is 0.5 m.
6. The combination portal foundation pit supporting system of claim 1, wherein: the anchor rod (5) is a mortar anchor rod, the rod body material of the anchor rod (5) is deformed steel bar with the diameter of 22mm, and the length of the deformed steel bar is 3.5 m.
7. The combination door frame foundation pit supporting system of claim 1, wherein: the surface course is wet shotcrete among shotcrete surface course (6), distributes in foundation ditch four walls, shotcrete surface course (6) are located vertical bored pile (1), can the outside of slip casting steel pipe (4), the thickness 80mm of shotcrete surface course (6).
8. A construction method of a combined portal type foundation pit supporting system is characterized by comprising the following steps: the construction method comprises the following construction parts: the first part comprises the construction of a vertical drilled pile (1), the construction of a horizontal supporting beam (2) and a longitudinal connecting beam (3), the second part comprises the construction of a groutable steel pipe (4), and the third part comprises the construction of an anchor rod (5) and a sprayed concrete surface layer (6);
s1, construction of the vertical drilling pile (1): the vertical drilled piles (1) are paired, cast-in-place reinforced concrete is adopted for construction, and the depth of a pile body penetrating into the position below the foundation pit bottom is not less than 2 m;
s2, construction of the horizontal support beam (2): cast-in-place reinforced concrete is adopted for construction, and the reinforcing steel bars of the cast-in-place reinforced concrete are mutually anchored with the reinforcing steel bars of the vertical drilled piles 1;
s3, construction of the groutable steel pipe (4): adopting a drill hole to embed and construct, wherein the top of the drill hole is anchored in the longitudinal connecting beam (3), the top opening is 0.3m higher than the longitudinal connecting beam, the bottom of the drill hole is anchored in the complete rock stratum, the bottom of the pipe enters 1m of the complete rock stratum, the grouting hole faces the outer side of the foundation pit, and cement mortar is injected from the ground surface after the construction of the steel pipe is finished;
s4, construction of the longitudinal connecting beam (3): the cast-in-place reinforced concrete is adopted for construction, the steel bars of the cast-in-place reinforced concrete are mutually anchored with the vertical drilled piles (1) and the horizontal supporting beams (2), and the cast-in-place reinforced concrete, the vertical drilled piles (1), the horizontal supporting beams (2) and the groutable steel pipes (4) form a whole after construction is completed;
s5, construction of the anchor rod (5): constructing when the foundation pit is excavated to be close to the bottom of the grouting steel pipe (4), and welding the end part of the anchor rod (5) with the grouting anchor rod;
s6, construction of the sprayed concrete surface layer (6): and constructing the foundation pit every 2m deep excavation until the foundation pit is excavated to the designed elevation.
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