CN115434334A - Large-diameter meat and vegetable secant pile anchor supporting structure and construction method thereof - Google Patents
Large-diameter meat and vegetable secant pile anchor supporting structure and construction method thereof Download PDFInfo
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- CN115434334A CN115434334A CN202211258517.1A CN202211258517A CN115434334A CN 115434334 A CN115434334 A CN 115434334A CN 202211258517 A CN202211258517 A CN 202211258517A CN 115434334 A CN115434334 A CN 115434334A
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- 238000010276 construction Methods 0.000 title claims abstract description 71
- 235000013311 vegetables Nutrition 0.000 title claims abstract description 27
- 235000013372 meat Nutrition 0.000 title claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 168
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 41
- 238000009434 installation Methods 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010079 rubber tapping 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
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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Abstract
The invention provides a large-diameter meat and vegetable secant pile anchor supporting structure and a construction method thereof. The pile anchor supporting structure comprises a reinforced concrete pile and a plain concrete pile which are mutually occluded, wherein an anchor cable mounting rack is pre-embedded in the plain concrete pile; the anchor cable mounting rack comprises two vertical embedded plates and at least two anchor cable mounting pipes fixed between the two vertical embedded plates. The anchor rope mounting bracket is installed downthehole at the stake through the horizontal location board of fixing at plain concrete pile stake hole drill way, has seted up the concrete placement hole on horizontal location board, pours plain concrete to downthehole the stake through the concrete placement hole on the horizontal location board to through anchor rope installation pipe construction anchor rope or stock after pile body concrete placement and maintenance are accomplished. The method reduces the step of drilling the inclined hole on the large-diameter pile body, avoids the risk of damage caused by the pile body, ensures the integrity of the pile body, improves the engineering quality of a pile anchor supporting system, and can greatly improve the construction efficiency of the foundation pit.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering construction, in particular to an anchor supporting structure for a large-diameter meat and vegetable secant pile and a construction method thereof, which are mainly applied to the condition that a secant pile is designed with a plurality of rows of anchor cables (rods).
Background
A 'concrete pile' is a so-called secant pile in the engineering field, and is a foundation pit supporting structure for supporting engineering of an underground structure foundation pit. Wherein, the plain concrete pile mainly has the functions of water stop, seepage prevention and soil blocking between piles; the reinforced concrete pile has a good bending moment resistance effect due to the arrangement of the reinforcement cage, can effectively support and block water and soil pressure in an active area, ensures the stability of a foundation pit, organically combines meat and vegetable concrete piles, can effectively play the roles of supporting and blocking the foundation pit in retaining soil, stopping water and preventing seepage, has the advantages of quickness in construction, good water stopping effect and the like, and is widely used in foundation pit engineering.
Still be provided with multirow anchor rope (pole) when foundation ditch engineering adopts secant pile supporting construction for a few, the conventional construction flow of this support system is that promptly meat and vegetable concrete stake anchor system: the construction method comprises the following steps of plain concrete pile construction, reinforced concrete pile construction, first-layer earthwork excavation, pile head breaking, first-layer anchor cable (rod) construction, crown beam construction, second-layer earthwork excavation, anchor cable (rod) hole drilling of a pile body, second-layer anchor cable (rod) and waist beam construction, wherein construction is carried out by adopting the method, the secant piles are embedded mutually to form a pile wall, inclined holes need to be drilled in the large-diameter pile body which is cured and formed in the later-period anchor cable (rod) construction below the first layer, the drilling of the inclined holes can easily damage the pile body to cause failure of a supporting system, the construction efficiency is low, the period is long, and the foundation pit is easily exposed for a long time to influence the safety and stability of the foundation pit; meanwhile, the produced concrete construction waste can cause environmental pollution, waste of concrete materials and increase labor and material costs.
Disclosure of Invention
The invention aims to design a large-diameter meat and vegetable secant pile anchor supporting structure and a construction method thereof, and the method does not need to drill an anchor cable (rod) inclined hole on the secant pile wall again, avoids the risk of damaging a pile body, ensures the integrity of the pile body, improves the engineering quality of a pile anchor supporting system, can greatly improve the construction efficiency of a foundation pit, and can effectively save the cost of human materials and protect the environment.
In order to achieve the technical purpose, the invention provides a large-diameter meat and vegetable occlusive pile anchor supporting structure which comprises a reinforced concrete pile and a vegetable concrete pile which are occluded with each other, wherein the pile diameter of the vegetable concrete pile is 500-1000 mm, the pile diameter of the reinforced concrete pile is more than or equal to 800mm, and the diameter of the vegetable concrete pile is 200-400 mm smaller than that of the reinforced concrete pile; the plain concrete pile comprises an anchor cable mounting frame pre-embedded in a pile hole, pile body concrete poured in the pile hole and a plurality of layers of anchor cables or anchor rods distributed in the plain concrete pile through the anchor cable mounting frame; the anchor cable mounting frame comprises two vertical pre-embedded plates and at least two anchor cable mounting pipes fixed between the two vertical pre-embedded plates, the at least two anchor cable mounting pipes are dispersedly distributed at positions of the vertical pre-embedded plates at different heights from bottom to top, each anchor cable mounting pipe is inclined, and pipe caps are arranged at two ends of each anchor cable mounting pipe; the anchor cable mounting frame is mounted in the pile hole through a horizontal positioning plate fixed at the pile hole opening of the plain concrete pile, a concrete pouring hole is formed in the horizontal positioning plate, the horizontal positioning plate is clamped with the two vertical embedded plates, and the plain concrete pile and the anchor cable or the anchor rod are dismounted after construction of the plain concrete pile and the anchor cable or the anchor rod is completed; the plain concrete pile body is formed by pouring plain concrete into the pile hole through the concrete pouring hole on the horizontal positioning plate after the anchor cable mounting frame is pre-buried to the pile hole; and the anchor cable or the anchor rod is installed in the plain concrete pile through the anchor cable installation pipe after the concrete of the pile body is poured and maintained.
The invention has the advantages that: the reinforced concrete pile and the plain concrete pile are mutually occluded by 100-200 mm, the pile bottom of the plain concrete pile exceeds the position 2-3 m below the excavation surface of the foundation pit, and the pile length of the reinforced concrete pile is longer than that of the plain concrete pile.
The invention has the following excellent technical scheme: the anchor cable mounting pipes are made of PVC pipes, the anchor cable mounting pipes obliquely penetrate through the vertical embedded plate on the other side from the vertical embedded plate on one side, the inclination angle is 15-30 degrees, and the inner diameter of each anchor cable mounting pipe is 140-160 mm; the inclination angles of at least two anchor cable mounting pipes are the same, and the arrangement position of each anchor cable mounting pipe corresponds to the anchor cable mounting position designed by the pile-anchor supporting structure; the distance between two adjacent anchor cable installation pipes is equal.
The invention has the following excellent technical scheme: the horizontal positioning plate is made of steel plates, the length of the horizontal positioning plate is greater than the diameter of a pile hole of a plain concrete pile, the width of the horizontal positioning plate is smaller than the diameter of the pile hole of the plain concrete pile, a vertical embedded plate mounting groove matched with the diameter of the pile hole of the plain concrete pile is formed in the length direction of the horizontal positioning plate, a concrete pouring hole is formed in the width direction of the horizontal positioning plate, and the aperture of the concrete pouring hole is 280-320 mm; and embedded plate clamping grooves are correspondingly arranged on two sides of the inner wall of the mounting groove, and the two vertical embedded plates are correspondingly inserted into the mounting groove along the clamping grooves respectively.
The invention has the following excellent technical scheme: the vertical embedded plates are PP plates, and the top of each vertical embedded plate is provided with a hanging ring; the vertical embedded plate close to the outer side of the foundation pit is provided with a split type body, the split type body comprises two plate bodies and an adjusting plate for connecting the two plate bodies, the anchor cable installation pipe is located on the same plate body, bolt connecting holes are reserved in the connecting positions of the two plate bodies respectively, adjusting screw holes are correspondingly formed in the adjusting plate, the two plate bodies are connected through the adjusting plate and locking bolts, the length of the vertical embedded plate close to the outer side of the foundation pit is adjusted, and therefore the inclination angle of the anchor cable installation pipe is adjusted.
In order to achieve the technical purpose, the invention also provides a construction method of the large-diameter meat and vegetable secant pile anchor supporting structure, which is characterized by comprising the following specific steps of:
(1) Manufacturing a guide wall, accurately measuring and positioning the pile center position of each secant pile according to drawing coordinates, wherein the error is not more than 20mm; constructing a secant pile reinforced concrete guide wall, wherein the inner width of the guide wall is at least 100mm larger than the two sides of the pile diameter, the thickness is 200-300 mm, and the width of each of the two sides is 800-1200 mm;
(2) The method comprises the following steps of forming holes in plain concrete piles, drilling holes by adopting a rotary drilling rig or full-rotation full-casing equipment, forming the holes at intervals of one pile by adopting a drilling-one-jump mode in the drilling sequence, and finishing the plain concrete pile holes, wherein the plane error of the formed holes is not more than 50mm; the aperture of a pile hole of the plain concrete pile is 500-1000 mm;
(3) Installing an anchor cable installation frame: after a single plain concrete pile hole is formed, installing an anchor cable installation frame in the plain concrete pile hole, longitudinally placing a plain concrete pile hole orifice on a horizontal positioning plate, wherein an installation groove and a concrete pouring hole on the horizontal positioning plate are opposite to the plain concrete pile hole, adjusting the plane position, and the central line of a vertical pre-embedded plate reserved by the positioning plate and the central line of the plain concrete pile hole are on the same straight line; then, vertically inserting an anchor cable mounting rack manufactured according to a design drawing into a plain concrete pile hole through a mounting groove on a horizontal positioning plate by using hoisting equipment;
(4) Pouring plain concrete piles: after the anchor cable mounting frame is installed, the hoisting concrete pouring guide pipes are sequentially lowered from the concrete pouring holes in the horizontal positioning plate to reach positions 300-500 mm away from the bottoms of the pile holes, and after the guide pipes are installed, concrete of plain concrete piles is poured underwater;
(5) Dismantling the positioning plate: after the concrete pouring of the plain concrete pile is finished, dismantling the positioning plate, finishing the construction of the first plain concrete pile, and then repeating the steps (2) to (4) to construct the next plain concrete pile;
(6) And (3) construction of the reinforced concrete pile: after 2-3 plain concrete piles are constructed, constructing a reinforced concrete pile with the pile diameter of 1600mm between the two plain concrete piles, wherein the construction of the reinforced concrete pile sequentially comprises hole forming, steel reinforcement cage laying and concrete pouring, the depth of the reinforced concrete pile is greater than that of the plain concrete pile, and the reinforced concrete pile and the two adjacent plain concrete piles are respectively mutually occluded by 200mm;
(7) Repeating the steps (5) and (6) to complete the construction of the meat and vegetable secant pile wall, then excavating a first layer of earthwork, and constructing a first layer of anchor cable or anchor rod and a crown beam at the position of the first layer of anchor cable mounting hole;
(8) Then continuing to excavate a second layer of earthwork, excavating the second layer of earthwork to a position 300-500 mm below the designed elevation of a second layer of anchor cable or anchor rod, directly constructing a second layer of construction anchor cable or anchor rod at the position of a reserved second layer of anchor cable mounting hole, and then completing the construction of a waist beam to form a support system;
(9) And (5) after the second layer of anchor cables or anchor rods and the waist beam are maintained, repeating the step (8), continuing earth excavation, constructing the lower layer of anchor cables or anchor rods and the waist beam according to a design drawing or reaching the designed foundation pit bottom elevation, gradually constructing, finally completing foundation pit construction, and entering a foundation construction stage.
The invention has the following excellent technical scheme: the process of manufacturing the anchor cable mounting frame according to the design drawing in the step (3) is to determine the length of the vertical pre-embedded plate and the elevation inside and outside the anchor cable mounting pipe pit according to the elevation of the orifice of the anchor cable or the anchor rod on the design drawing, wherein the upper end of the vertical pre-embedded plate is 300-500 mm higher than the horizontal positioning plate, the lower end of the vertical pre-embedded plate is 300-500 mm longer than the center elevation of the anchor hole at the bottommost layer, the middle length and the position of the anchor cable mounting pipe are determined according to the design drawing, then mounting holes matched with the anchor cable mounting pipe are formed in the corresponding position on the vertical pre-embedded plate, and the anchor cable mounting pipe is fixedly embedded in the mounting holes in the vertical pre-embedded plate; after the mounting hole is designed, the inclination angle of the anchor hole can be adjusted and adjusted by adjusting the length of the vertical embedded plate close to the outer side of the foundation pit, and the inclination angle of the anchor hole is ensured to be 15-30 degrees.
The invention has the advantages that: and (3) hoisting the anchor cable mounting frame by adopting a 25T crane, vertically placing the assembled vertical embedded plate and the anchor cable mounting pipe into a preset position of a pile hole, and measuring and controlling the direction and the elevation of the device, wherein the error is not more than 20mm.
The invention has the advantages that: the diameter of the conduit in the step (4) is 180 mm-220 mm.
The invention has the following excellent technical scheme: during anchor cable or anchor rod construction in the step (6) and the step (7), a pipe cap of the anchor cable installation pipe close to the inner side end of the foundation pit is directly removed, the position of the reserved anchor hole is rechecked, then the drilling machine is put in place, the angle of the drill rod is adjusted, the anchor cable drilling machine directly drills the anchor rod or anchor cable hole towards the outer side of the foundation pit through the anchor cable installation hole, and after the hole is formed to the designed depth, anchor cable or anchor rod installation and grouting construction are sequentially carried out.
The invention has the beneficial effects that:
(1) The method reduces the step that inclined holes need to be drilled on the cured and molded large-diameter pile body during anchor cable construction after earth excavation in the later period of the foundation pit, avoids the risk of damage to the pile body, ensures the integrity of the pile body, improves the engineering quality of a pile-anchor supporting system, and can greatly improve the construction efficiency of the foundation pit.
(2) According to the invention, the anchor cable mounting pipe frame is pre-embedded into the pile hole, then concrete is poured, so that the waste of concrete materials caused by pouring concrete and drilling holes is avoided, and the anchor cable mounting pipe frame embedded into the pile hole can play a certain supporting role, so that the waste of concrete materials is further reduced, and the construction cost is reduced.
(3) The invention reduces the investment of the later-stage tapping equipment and saves the labor; and no redundant building rubbish is generated in the whole construction process, so that the environmental pollution is avoided.
(4) The anchor cable mounting frame comprises the support frame and the anchor cable mounting reserved pipes, can be manufactured in advance and integrally mounted in pile holes in the construction process, can realize the mounting of multiple rows of the pre-buried pipes with different heights at one time, and saves the mounting process of the pre-buried pipes.
(5) The inclination angles of the multiple rows of the embedded pipes of the anchor cable mounting rack can be adjusted, the inclination angles of the anchor cable embedded pipes can be adjusted according to construction design, and different construction requirements are met.
(6) The anchor cable mounting rack is provided with the positioning plate and the grouting holes, so that positioning and mounting of the anchor cable mounting rack can be guaranteed, and after the anchor cable mounting rack is mounted, concrete is poured into the whole pile hole through the grouting holes, so that the anchor cable mounting rack is simple and convenient to construct.
Drawings
FIG. 1 is a schematic plan view of a meat-vegetable bite pile in the invention;
fig. 2 is a schematic elevation view of a pile-anchor supporting structure according to the present invention;
FIG. 3 is a plan view of the horizontal positioning plate of the present invention;
fig. 4 is a perspective view of a stationary cable bolt mounting bracket according to the present invention;
FIG. 5 is a schematic view of an adjustable cable mount according to the present invention;
FIG. 6 is a schematic view of the cable mount adjustment of FIG. 5;
FIG. 7 is an elevation view of the vertical embedment plate away from the outer side of the foundation pit in accordance with the present invention;
fig. 8 is an elevation view of a vertical embedment plate adjacent to the outer side of the foundation pit in accordance with the present invention.
In the figure: the concrete anchor pile comprises 1-reinforced concrete pile, 2-plain concrete pile, 3-anchor rope mounting frame, 300-vertical embedded plate, 301-horizontal positioning plate, 302-anchor rope mounting pipe, 303-concrete pouring hole, 304-pipe cap, 305-mounting groove, 306-embedded plate clamping groove, 307-hanging ring, 308-bolt connecting hole, 309-adjusting plate, 310-adjusting screw hole, 311-locking bolt, 4-pile body concrete, and 5-anchor rope or anchor rod.
Detailed Description
The invention will be further explained with reference to the drawings. Fig. 1 to 5 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The embodiment provides a large-diameter meat and vegetable secant pile anchor supporting structure, which comprises a reinforced concrete pile 1 and a vegetable concrete pile 2 which are mutually meshed, wherein the pile diameter of the vegetable concrete pile 2 is 500-1000 mm, the pile diameter of the reinforced concrete pile 1 is more than or equal to 800mm, and the diameter of the vegetable concrete pile 2 is 200-400 mm smaller than that of the reinforced concrete pile 1; the reinforced concrete pile 1 and the plain concrete pile 2 are mutually occluded for 100-200 mm, the pile bottom of the plain concrete pile 2 exceeds the position 2-3 m below the excavation surface of the foundation pit, and the pile length of the reinforced concrete pile 1 is larger than that of the plain concrete pile 2. The plain concrete pile 2 comprises an anchor cable mounting frame 3 pre-buried in a pile hole, pile body concrete 4 poured in the pile hole and a plurality of layers of anchor cables or anchor rods 5 arranged in the plain concrete pile 2 through the anchor cable mounting frame 3. The anchor cable mounting rack 3 is arranged in a pile hole through a horizontal positioning plate 301 fixed on the hole opening of the pile hole of the plain concrete pile, and is dismantled after the construction of the plain concrete pile 2 and the anchor cable or anchor rod 5 is finished; the plain concrete pile body 4 is formed by pouring plain concrete into a pile hole through a concrete pouring hole 303 on a horizontal positioning plate 301 after the anchor cable mounting frame 3 is pre-embedded to the pile hole; the anchor cable or anchor rod 5 is installed in the plain concrete pile 2 through the anchor cable installation pipe 302 after the pile body concrete is poured and maintained.
As shown in fig. 4 to 6, the anchor cable mounting bracket 3 includes two vertical embedded plates 300 and two anchor cable mounting pipes 302 fixed between the two vertical embedded plates 300, the two anchor cable mounting pipes 302 are dispersedly arranged at different heights of the vertical embedded plates 300 from bottom to top, each anchor cable mounting pipe 302 is inclined, and pipe caps 304 are arranged at two ends of each anchor cable mounting pipe 302; the vertical embedded plates 300 are PP plates, and the top of each vertical embedded plate 300 is provided with a hanging ring 307; the anchor cable installation pipe 302 is made of a PVC pipe. The vertical embedded plates 300 are correspondingly provided with through holes, the anchor cable mounting pipes 302 obliquely penetrate through the vertical embedded plate on the other side from the vertical embedded plate on one side, the inclination angle is 15-30 degrees, and the inner diameter of each anchor cable mounting pipe 302 is 140-160 mm. The inclination angles of at least two anchor cable mounting pipes 302 are the same, and the arrangement position of each anchor cable mounting pipe 302 corresponds to the anchor cable mounting position designed by the pile anchor supporting structure; the distance between two adjacent anchor cable installation pipes 302 is equal.
In the accompanying drawings, two types of anchor cable mounting brackets are shown in the embodiment, wherein the anchor cable mounting bracket 3 in fig. 4 is fixed, the lengths of the vertical embedded plates 300 on both sides are not adjustable, and the anchor cable mounting bracket 3 determines the position of an anchor cable mounting pipe 302 according to the designed position of an anchor cable or a bolt, and fixedly connects the anchor cable mounting pipe with the anchor bolt. The anchor cable mounting frame 3 shown in fig. 5 and 6 is adjustable, a vertical embedded plate 300 close to the outer side of the foundation pit is set into a split type, and comprises two plate bodies and an adjusting plate 309 for connecting the two plate bodies, the anchor cable mounting pipe 302 is located on the plate body on the lower side, bolt connecting holes 308 are reserved at the connecting part of the two plate bodies respectively, an adjusting screw hole 310 is correspondingly arranged on the adjusting plate 309, the two plate bodies are connected through the adjusting plate 309 and a locking bolt 311, when adjustment is needed, as shown in fig. 6, the position of the upper side plate body is fixed, the two locking bolts 311 are loosened, the position of the lower side plate body is adjusted, the adjusting screw hole 310 on the adjusting plate 310 corresponds to the bolt connecting hole 308 of the two plate body trusses, and then locking is performed, so that the length of the vertical embedded plate close to the outer side of the foundation pit can be adjusted, and the inclination angle of the mounting pipe 302 can be adjusted.
As shown in fig. 3, the horizontal positioning plate 301 is made of a steel plate, the length of the horizontal positioning plate is greater than the diameter of a pile hole of a plain concrete pile 2, the width of the horizontal positioning plate is less than the diameter of the pile hole of the plain concrete pile 2, a vertical pre-embedded plate mounting groove 305 matched with the diameter of the pile hole of the plain concrete pile 2 is formed in the length direction of the horizontal positioning plate 301, a concrete pouring hole 303 is formed in the horizontal positioning plate 301, the concrete pouring hole 303 is formed in the width direction of the horizontal positioning plate 301, and the aperture of the concrete pouring hole 303 is 280 mm-320 mm; embedded board slots 306 are correspondingly formed on two sides of the inner wall of the mounting groove 305, and the two vertical embedded boards 300 are correspondingly inserted into the mounting groove 305 along the slots 306. As shown in fig. 4, the horizontal positioning plate 301 is engaged with two vertical embedded plates 300,
the invention is further explained by combining the embodiment, the method is used for a certain foundation pit project, the foundation pit project is positioned in a coastal beach area, the excavation depth is about 10m, one side of the foundation pit adopts a meat-vegetable secant pile anchor supporting system, and the pile spacing is 1600mm; the pile diameter of the plain reinforced concrete pile is 1000mm, the pile length is 13.4m, the concrete strength grade is C20, the pile diameter of the reinforced concrete pile is 1200mm, the pile length is 27.4m, and the concrete strength grade is C35; 3 layers of prestressed anchor cables are arranged, the diameter of each anchor cable is 150mm, one pile is arranged, one anchor is arranged, and the row spacing of the anchor cables is 2.2m. The invention relates to a construction method of a large-diameter meat and vegetable secant pile anchor supporting system, which comprises the following steps of:
(1) Manufacturing a guide wall, accurately measuring and positioning the pile center position of each secant pile according to drawing coordinates, wherein the error is not more than 20mm; and constructing the secant pile reinforced concrete guide wall, wherein the inner width of the guide wall is greater than 100mm on each of two sides of the pile diameter, the thickness of the guide wall is 300mm, and the widths of the two sides of the guide wall are 1200mm respectively.
(2) The plain concrete pile is drilled, a 360-degree rotary drilling rig can be adopted for drilling, holes are formed at intervals of one pile in a drilling-one-jump-one mode in the drilling sequence, the plain concrete pile hole is completed, and the error of a hole forming plane is not more than 50mm; the aperture of the pile hole of the plain concrete pile is 1000mm.
(3) Installing an anchor cable installation frame: after a single plain concrete pile hole is formed, installing an anchor cable installation frame in the plain concrete pile hole: a. firstly, a horizontal positioning plate is longitudinally placed at the orifice of a plain concrete pile hole, a mounting groove and a concrete pouring hole on the horizontal positioning plate are both over against the plain concrete pile hole, the position of a plane is adjusted, and the central line of a vertical embedded plate reserved on the positioning plate is on the same straight line with the central line of the plain concrete pile hole; the positioning plate 301 is a 3mm thick steel plate, the length is 1400mm, the width is 900mm, a plain concrete pile body concrete pouring hole is formed in the positioning plate 301, and the diameter of the hole is 300mm;
b. manufacturing an anchor cable mounting rack according to a design drawing, specifically determining the length of a vertical pre-embedded plate and the elevation inside and outside a hole of an anchor cable mounting pipe according to the elevation of a hole opening of an anchor cable or an anchor rod on the design drawing, wherein the pre-embedded plate vertical plate 300 is a PP plate with the thickness of 2mm and the length of 7m, mounting holes of the anchor cable mounting pipe are formed in the anchor cable (rod) elevation position according to the inclination angle of the anchor cable of 15 degrees, the hole diameter is 165mm, the distance from the center of a first hole of the vertical pre-embedded plate inside the hole to the plate end is 4m, and the distance from the center of a second hole of the vertical pre-embedded plate inside the hole to the plate end is 6.2m; the center of the first hole of the vertical embedded plate outside the pit is 4.25m from the plate end, and the center of the second hole of the vertical embedded plate 2 outside the pit is 6.45m from the plate end; the plate width of the vertical embedded plate 300mm above the horizontal positioning plate is 400mm, and the plate width of the lower vertical embedded plate is 300mm; the anchor cable installation pipe is a PVC pipe, the inner diameter of the PVC pipe is 150mm, the length of the PVC pipe is 1200mm, and two ends of the PVC pipe are blocked by pipe caps;
c. and (3) vertically placing the assembled embedded plate and embedded pipe integral device into a preset position of a pile hole by adopting a 25T crane, measuring and controlling the direction and the elevation of the device, wherein the error is not more than 20mm.
(4) Pouring plain concrete piles: after the anchor cable mounting frame is installed, the hoisting concrete pouring guide pipes are sequentially placed from the concrete pouring holes in the horizontal positioning plate to reach positions 300-500 mm away from the bottoms of the pile holes, after the guide pipes are installed, concrete of plain concrete piles is poured underwater, and the diameter of each concrete pouring guide pipe is 200mm.
(5) Dismantling the positioning plate: after the concrete pouring of the plain concrete pile is finished, removing the positioning plate, finishing the construction of the first plain concrete pile, then repeating the steps (2) to (4), and constructing the next plain concrete pile;
(6) And (3) construction of the reinforced concrete pile: after 2-3 plain concrete piles are constructed, constructing a reinforced concrete pile with the pile diameter more than or equal to 800mm between the two plain concrete piles, wherein the diameter of the plain concrete pile is 200-400 mm smaller than that of the reinforced concrete pile; the construction of the reinforced concrete pile sequentially comprises hole forming, steel reinforcement cage lowering and concrete pouring, wherein the depth of the reinforced concrete pile is larger than that of the plain concrete pile, and the reinforced concrete pile and two adjacent plain concrete piles are mutually meshed by 100-200 mm respectively;
(7) Repeating the steps (5) and (6) to complete the construction of the meat and vegetable secant pile wall, then excavating a first layer of earthwork, and constructing a first layer of anchor cable or anchor rod and a crown beam at the position of the first layer of anchor cable mounting hole; during anchor cable or anchor rod construction in the step (6) and the step (7), a pipe cap of the end part, close to the inner side end part of the foundation pit, of the anchor cable installation pipe is directly detached, the position of the reserved anchor hole is rechecked, then the drilling machine is put in place, the angle of the drill rod is adjusted, the anchor cable drilling machine directly drills the anchor rod or anchor cable hole towards the outer side of the foundation pit through the anchor cable installation hole, and after the hole is formed to the designed depth, anchor cable or anchor rod installation and grouting construction are sequentially carried out.
(8) Then, continuously excavating a second layer of earthwork to a position 300-500 mm below the design elevation of a second layer of anchor cable or anchor rod, directly constructing a second layer of construction anchor cable or anchor rod at the position of a reserved second layer of anchor cable mounting hole, and then completing construction of a waist beam to form a supporting system;
(9) And (5) after the second layer of anchor cables or anchor rods and the waist beam are maintained, repeating the step (8), continuing earth excavation, constructing the lower layer of anchor cables or anchor rods and the waist beam according to a design drawing or reaching the designed foundation pit bottom elevation, gradually constructing, finally completing foundation pit construction, and entering a foundation construction stage.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a meat vegetable interlock stake anchor supporting construction of major diameter which characterized in that: the supporting structure comprises a reinforced concrete pile (1) and a plain concrete pile (2) which are mutually meshed, the pile diameter of the plain concrete pile (2) is 500-1000 mm, the pile diameter of the reinforced concrete pile (1) is more than or equal to 800mm, and the diameter of the plain concrete pile (2) is 200-400 mm smaller than that of the reinforced concrete pile (1); the plain concrete pile (2) comprises an anchor cable mounting rack (3) pre-embedded in a pile hole, pile body concrete (4) poured in the pile hole and a plurality of layers of anchor cables or anchor rods (5) distributed in the plain concrete pile (2) through the anchor cable mounting rack (3); the anchor cable mounting rack (3) comprises two vertical embedded plates (300) and at least two anchor cable mounting pipes (302) fixed between the two vertical embedded plates (300), the at least two anchor cable mounting pipes (302) are dispersedly distributed at different heights of the vertical embedded plates (300) from bottom to top, each anchor cable mounting pipe (302) is inclined, and pipe caps (304) are arranged at two ends of each anchor cable mounting pipe; the anchor cable mounting rack (3) is mounted in a pile hole through a horizontal positioning plate (301) fixed at the pile hole orifice of a plain concrete pile, a concrete pouring hole (303) is formed in the horizontal positioning plate (301), the horizontal positioning plate (301) is clamped with the two vertical embedded plates (300), and the plain concrete pile (2) and the anchor cable or anchor rod (5) are dismounted after construction is completed; the plain concrete pile body (4) is formed by pouring plain concrete into a pile hole through a concrete pouring hole (303) on a horizontal positioning plate (301) after the anchor cable mounting rack (3) is pre-buried to the pile hole; and the anchor cable or the anchor rod (5) is installed in the plain concrete pile (2) through the construction of the anchor cable installation pipe (302) after the concrete of the pile body is poured and maintained.
2. The large-diameter meat and vegetable secant pile anchor supporting structure according to claim 1, is characterized in that: the reinforced concrete pile (1) and the plain concrete pile (2) are mutually occluded by 100-200 mm, the pile bottom of the plain concrete pile (2) exceeds the lower part of the excavation surface of the foundation pit by 2-3 m, and the pile length of the reinforced concrete pile (1) is longer than that of the plain concrete pile (2).
3. A large-diameter meat and vegetable secant pile anchor supporting structure according to claim 1 or 2, characterized in that: the anchor cable mounting pipes (302) are PVC pipes, the anchor cable mounting pipes (302) obliquely penetrate through the vertical embedded plate on the other side from the vertical embedded plate on one side, the inclination angle is 15-30 degrees, and the inner diameter of each anchor cable mounting pipe (302) is 140-160 mm; the inclination angles of at least two anchor cable installation pipes (302) are the same, and the arrangement position of each anchor cable installation pipe (302) corresponds to the anchor cable installation position designed by a pile anchor supporting structure; the distance between two adjacent anchor cable installation pipes (302) is equal.
4. The large-diameter meat-vegetable secant pile anchor supporting structure according to claim 1 or 2, characterized in that: the horizontal positioning plate (301) is made of steel plates, the length of the horizontal positioning plate is greater than the diameter of a pile hole of the plain concrete pile (2), the width of the horizontal positioning plate is smaller than the diameter of the pile hole of the plain concrete pile (2), a vertical embedded plate mounting groove (305) matched with the diameter of the pile hole of the plain concrete pile (2) is formed in the length direction of the horizontal positioning plate (301), the concrete pouring hole (303) is formed in the width direction of the horizontal positioning plate (301), and the aperture of the concrete pouring hole is 280-320 mm; embedded plate clamping grooves (306) are correspondingly formed in two sides of the inner wall of the mounting groove (305), and the two vertical embedded plates (300) are correspondingly inserted into the mounting groove (305) along the clamping grooves (306).
5. The large-diameter meat-vegetable secant pile anchor supporting structure according to claim 1 or 2, characterized in that: the vertical embedded plates (300) are PP plates, and the top of each vertical embedded plate (300) is provided with a hanging ring (307); the vertical embedded plate (300) close to the outer side of the foundation pit is arranged into a split type, and comprises two plate bodies and an adjusting plate (309) connected with the two plate bodies, the anchor cable mounting pipe (302) is located on the same plate body, bolt connecting holes (308) are reserved at the connecting positions of the two plate bodies respectively, an adjusting screw hole (310) is correspondingly formed in the adjusting plate (309), the two plate bodies are connected through the adjusting plate (309) and a locking bolt (311), the length of the vertical embedded plate close to the outer side of the foundation pit is adjusted, and therefore the inclination angle of the anchor cable mounting pipe (302) is adjusted.
6. A construction method of a large-diameter meat-vegetable secant pile anchor supporting structure according to any one of claims 1 to 5 is characterized by comprising the following specific steps:
(1) Manufacturing a guide wall, namely accurately measuring and positioning the pile center position of each occlusive pile according to drawing coordinates, wherein the error is not more than 20mm; constructing a secant pile reinforced concrete guide wall, wherein the inner width of the guide wall is at least 100mm larger than the two sides of the pile diameter, the thickness is 200-300 mm, and the width of each of the two sides is 800-1200 mm;
(2) The method comprises the following steps of forming holes in plain concrete piles, drilling holes by adopting a rotary drilling rig or full-rotation full-casing equipment, forming the holes at intervals of one pile by adopting a drilling-one-jump mode in the drilling sequence, and finishing the plain concrete pile holes, wherein the plane error of the formed holes is not more than 50mm; the aperture of a pile hole of the plain concrete pile is 500 mm-1000 mm;
(3) Installing an anchor cable installation frame: after a single plain concrete pile hole is formed, installing an anchor cable installation frame in the plain concrete pile hole, longitudinally placing a plain concrete pile hole orifice on a horizontal positioning plate, wherein an installation groove and a concrete pouring hole on the horizontal positioning plate are opposite to the plain concrete pile hole, adjusting the plane position, and the central line of a vertical pre-embedded plate reserved by the positioning plate and the central line of the plain concrete pile hole are on the same straight line; then, vertically inserting an anchor cable mounting rack manufactured according to a design drawing into a plain concrete pile hole through a mounting groove on a horizontal positioning plate by using hoisting equipment;
(4) Pouring plain concrete piles: after the anchor cable mounting frame is installed, hoisting concrete pouring guide pipes are placed one by one from concrete pouring holes in the horizontal positioning plate to reach positions 300-500 mm away from the bottom of a pile hole, and after the guide pipes are installed, underwater concrete of plain concrete piles is poured;
(5) Dismantling the positioning plate: after the concrete pouring of the plain concrete pile is finished, removing the positioning plate, finishing the construction of the first plain concrete pile, then repeating the steps (2) to (4), and constructing the next plain concrete pile;
(6) And (3) construction of the reinforced concrete pile: after 2-3 plain concrete piles are constructed, constructing a reinforced concrete pile with the pile diameter more than or equal to 800mm between the two plain concrete piles, wherein the diameter of the plain concrete pile is 200-400 mm smaller than that of the reinforced concrete pile; the construction of the reinforced concrete pile sequentially comprises pore forming, steel reinforcement cage laying and concrete pouring, wherein the depth of the reinforced concrete pile is greater than that of the plain concrete pile, and the reinforced concrete pile and two adjacent plain concrete piles are mutually occluded by 100-200 mm respectively;
(7) Repeating the steps (5) and (6) to complete the construction of the meat and vegetable secant pile wall, then excavating a first layer of earthwork, and constructing a first layer of anchor cable or anchor rod and a crown beam at the position of the first layer of anchor cable mounting hole;
(8) Then continuing to excavate a second layer of earthwork, excavating the second layer of earthwork to a position 300-500 mm below the designed elevation of a second layer of anchor cable or anchor rod, directly constructing a second layer of construction anchor cable or anchor rod at the position of a reserved second layer of anchor cable mounting hole, and then completing the construction of a waist beam to form a support system;
(9) And (5) after the second layer of anchor cables or anchor rods and the waist beam are maintained, repeating the step (8), continuing earth excavation, constructing the lower layer of anchor cables or anchor rods and the waist beam according to a design drawing or reaching the designed foundation pit bottom elevation, gradually constructing, finally completing foundation pit construction, and entering a foundation construction stage.
7. The construction method of the large-diameter meat and vegetable secant pile anchor supporting structure according to claim 6 is characterized in that: the process of manufacturing the anchor cable mounting frame according to the design drawing in the step (3) is to determine the length of the vertical pre-buried plate and the elevation inside and outside the anchor cable mounting pipe pit according to the elevation of the orifice of the anchor cable or the anchor rod on the design drawing, wherein the upper end of the vertical pre-buried plate is 300-500 mm higher than the horizontal positioning plate, the lower end of the vertical pre-buried plate is 300-500 mm longer than the center elevation of the anchor hole at the bottommost layer, the middle length and the position of the anchor cable mounting pipe are determined according to the design drawing, then mounting holes matched with the anchor cable mounting pipe are formed in the corresponding position on the vertical pre-buried plate, and the anchor cable mounting pipe is fixedly embedded in the mounting holes on the vertical pre-buried plate; after the mounting hole is designed, the inclination angle of the anchor hole can be adjusted and adjusted by adjusting the length of the vertical embedded plate close to the outer side of the foundation pit, and the inclination angle of the anchor hole is ensured to be 15-30 degrees.
8. The construction method of the large-diameter meat and vegetable secant pile anchor supporting structure according to claim 6, characterized in that: and (3) hoisting the anchor cable mounting frame by adopting a 25T crane, vertically placing the assembled vertical embedded plate and the anchor cable mounting pipe into a preset position of a pile hole, and measuring and controlling the direction and the elevation of the device, wherein the error is not more than 20mm.
9. The construction method of the large-diameter meat and vegetable secant pile anchor supporting structure according to claim 6, characterized in that: the diameter of the conduit in the step (4) is 180 mm-220 mm.
10. The construction method of the large-diameter meat and vegetable secant pile anchor supporting structure according to claim 6 is characterized in that: during anchor cable or anchor rod construction in the step (6) and the step (7), a pipe cap of the anchor cable installation pipe close to the inner side end of the foundation pit is directly removed, the position of the reserved anchor hole is rechecked, then the drilling machine is put in place, the angle of the drill rod is adjusted, the anchor cable drilling machine directly drills the anchor rod or anchor cable hole towards the outer side of the foundation pit through the anchor cable installation hole, and after the hole is formed to the designed depth, anchor cable or anchor rod installation and grouting construction are sequentially carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211258517.1A CN115434334B (en) | 2022-10-14 | 2022-10-14 | Large-diameter meat-vegetable occluding pile anchor supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211258517.1A CN115434334B (en) | 2022-10-14 | 2022-10-14 | Large-diameter meat-vegetable occluding pile anchor supporting structure and construction method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853556A (en) * | 2019-01-22 | 2019-06-07 | 华北有色工程勘察院有限公司 | The ultra-deep that can bear explosion influence adopts hole supporting and retaining system and its construction method |
| CN212585890U (en) * | 2020-08-12 | 2021-02-23 | 河南高建工程管理有限公司 | Prestressed anchor cable tension detector |
| CN113700000A (en) * | 2021-08-26 | 2021-11-26 | 中建八局第二建设有限公司 | Supporting construction of binary geology hitching leg stake |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109853556A (en) * | 2019-01-22 | 2019-06-07 | 华北有色工程勘察院有限公司 | The ultra-deep that can bear explosion influence adopts hole supporting and retaining system and its construction method |
| CN212585890U (en) * | 2020-08-12 | 2021-02-23 | 河南高建工程管理有限公司 | Prestressed anchor cable tension detector |
| CN113700000A (en) * | 2021-08-26 | 2021-11-26 | 中建八局第二建设有限公司 | Supporting construction of binary geology hitching leg stake |
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