CN112211199A - Large deep foundation pit supporting construction structure and method thereof - Google Patents
Large deep foundation pit supporting construction structure and method thereof Download PDFInfo
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- CN112211199A CN112211199A CN202010262342.6A CN202010262342A CN112211199A CN 112211199 A CN112211199 A CN 112211199A CN 202010262342 A CN202010262342 A CN 202010262342A CN 112211199 A CN112211199 A CN 112211199A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3261—Safety-nets; Safety mattresses; Arrangements on buildings for connecting safety-lines
- E04G21/3266—Safety nets
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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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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Abstract
The invention relates to the technical field of intelligent environment-friendly engineering construction, in particular to a large-scale deep foundation pit supporting construction structure and a method thereof, wherein the large-scale deep foundation pit supporting construction structure comprises a road surface, a side slope, a side surface of a foundation pit, an upper soil nailing wall arranged on the surface of the side slope, a lower soil nailing wall arranged on the side surface of the foundation pit, a crown beam, a concrete support column, a concrete pile arranged on the road surface, a steel pipe, a blocking net and a steel wire; the method also comprises the steps of building concrete piles, building soil nailing walls, building crown beams, concrete support columns, building retaining facilities and building soil nailing walls. The invention solves the technical problems of insecure support and large occupied area of the arranged protective net in the construction process of the deep foundation pit in the prior art.
Description
Technical Field
The invention relates to the technical field of intelligent environment-friendly engineering construction, in particular to a large-scale deep foundation pit supporting construction structure and a method thereof.
Background
The deep foundation pit refers to an engineering with excavation depth of more than 5 meters (including 5 meters) or more than three layers (including three layers) of a basement, or a construction with excavation depth of less than 5 meters, but particularly complex geological conditions, surrounding environment and underground pipelines. The deep foundation pit engineering mainly comprises foundation pit supporting system design and construction and earthwork excavation, wherein the foundation pit supporting mainly aims at preventing the side edge of a foundation pit from collapsing and preventing vehicle personnel at the top of the foundation pit from falling. In the prior art, a foundation pit support facility is generally constructed by building a side slope, then building a soil nailing concrete net on the side slope, and building a crown beam and a strut on the side surface of the foundation pit, wherein the mode of arranging a protective net is to arrange a concrete column on the bottom surface of the foundation pit and support a rope lifting net. Foundation pits constructed in this way are not firm in the soil, and if the foundation pit is close to the road surface, vehicles on the road surface are likely to cause collapse of the soil. If the support is added into the soil layer, the stress capacity of the soil layer can be increased, and the soil layer can be well stabilized. And can occupy the very large tracts of land of foundation ditch bottom when setting up the foundation ditch protection network among the prior art, need set up many concrete columns in addition in the foundation ditch bottom, both consumed the material, also not convenient to be under construction in the foundation ditch.
Therefore, there is a need for improvement of the prior art to solve the above technical problems.
Disclosure of Invention
In view of the above, the invention aims to provide a large-scale deep foundation pit supporting construction structure and a method thereof, and solve the technical problems that in the prior art, in the deep foundation pit construction process, supporting is not firm, and the occupied area for arranging a protective net is large. The method is realized by the following technical scheme:
the designed large-scale deep foundation pit supporting construction structure comprises a road surface, a side slope, a side surface of a foundation pit, an upper soil nailing wall arranged on the surface of the side slope, a lower soil nailing wall arranged on the side surface of the foundation pit, a crown beam, a concrete support column, a concrete pile arranged on the road surface, a steel pipe, a blocking net and a steel wire; the side surface of the foundation pit is arranged below the side slope, the side surface of the foundation pit can be arranged to be vertical to the ground for foundation geology with good soil quality and shallow depth, a certain included angle can be formed between the side surface of the foundation pit and the ground for a deep foundation pit with bad foundation geology condition or depth more than 5m, the specific included angle can be determined according to site construction conditions, both the side slope and the side surface of the foundation pit can be excavated by adopting an excavator, after a large excavator digs out the contour of the side slope and the side surface of the foundation pit, the slope is repaired by manually matching with a small excavator, meanwhile, a slope ruler is used for controlling and checking the slopes of the side slope and the side surface of the foundation pit, whether the slope meets design requirements or not is checked, the slopes of the formed side; the upper soil nailing wall and the lower soil nailing wall are formed by pouring soil nails, reinforcing steel bars and concrete, soil nails are installed by adopting a horizontal drill after the side faces of the side slopes and the foundation pits are formed, the hole forming angle is 15-20 degrees, the soil nails are bound by reinforcing steel bar meshes after hole forming, the reinforcing steel bar meshes adopt HPB300 reinforcing steel bars, phi 6@250 multiplied by 250, the thickness of a protective layer is 30mm, then panel concrete is sprayed, C20 fine stone concrete is sprayed from bottom to top by adopting air compression equipment in a subsection mode, the spraying process is carried out so that the spraying resilience is small, the spraying layer strength is high, the spraying thickness is 80mm, and when the slope faces of the side slopes and the side faces of the foundation pits are; the top beam is connected with the side face of the foundation pit, a prestressed anchor rod inserted into a soil layer on the side face of the foundation pit can be arranged on the side face of the foundation pit, when the top beam is installed, the top beam is made of reinforced concrete cast steel bars, the anchor rod penetrates through the top beam, after the casting strength of the top beam reaches the design requirement, prestress is applied to the anchor rod in a stretching mode, and an anchor backing plate is installed for fixing; the concrete support column is connected with the crown beam, the side surface of the foundation pit, the lower concrete nail wall and the bottom surface of the foundation pit, the concrete support column is vertically drilled downwards, a reinforcement cage is placed after the concrete support column is formed, the support column is poured, the foundation pit is dug after the strength of the concrete meets the design requirement, and the concrete support column is tightly attached to the side slope; the concrete piles are perpendicular to the ground and penetrate through soil layers in the direction perpendicular to the side faces of the side slopes and the side faces of the foundation pits, the top of each concrete pile is higher than the road surface, the concrete piles can be built adjacent to the edges of the road surface, the edges close to the road surface are close to the side slopes, retaining nets beside the road surface can be arranged on the inner sides of the concrete piles, dense nets can be used as retaining nets beside the road surface, the concrete piles can be arranged in multiple numbers along the road surface, the specific number and the specific interval of the concrete piles can be designed according to the soil layer condition, the depth of the foundation pits and the like, the distance between each concrete pile and each side slope is equal, crown beams for connecting the piles can be excavated and designed on the ground; the steel pipes are arranged in a plurality of numbers, the length, the height and the angle of each steel pipe are the same, the steel pipes are arranged at the connecting positions of the side slopes and the side faces of the foundation pit, the steel pipes can be arranged to form 90 degrees with the side slopes, the lower parts of the steel pipes are arranged in the soil layer, and the upper parts of the steel pipes are arranged outside the soil layer; the blocking net is arranged among the steel pipes and is bound and connected with the upper parts of the steel pipes, and the blocking net can be a rope net; the upper portion of steel pipe and the top of concrete pile are connected to the steel wire, the steel wire can be in the state of straining, there is oblique ascending pulling force to the steel pipe, the steel pipe plays the supporting role to the fag end, the steel pipe that sets up many vertically concrete pile and insert the soil layer to one side in the soil layer can play the effect firm to the soil layer, the decompression, concrete pile itself also can the atress, reduce the atress on side slope place soil layer, concrete pile runs through the soil layer that side slope and foundation ditch side place simultaneously, equivalent to increased many concrete support in the soil layer, prevent that the soil layer from collapsing also having an effect to firm soil layer, the degree of depth that concrete pile set up is greater than the total of side slope and foundation ditch side vertical height, can further prevent that the soil layer from collapsing.
Further, the lower part of steel pipe is connected with the concrete pile, can place the steel reinforcement cage at the concrete pile after, pour before with the steel pipe lower part insert in the space between the steel reinforcement cage, then pour the concrete pile again, the concrete pile pours as an organic wholely with the steel pipe, sets up the steel pipe and is connected with the concrete pile, steel pipe, steel wire form stable triangle-shaped, the effect of firm side slope is better, the soil layer is difficult to collapse more.
Further, large-scale deep basal pit supporting construction structures still includes the lower stock of setting in the foundation ditch side, the stock runs through soil nail wall down, and one end sets up in the soil horizon, and the other end sets up in the soil nail wall outside down, sets up down the stock, further stabilizes soil nail wall, and the stock can further stabilize the soil horizon down simultaneously.
Further, the anchor rod sets up with ground level down, and the one end that sets up in the soil horizon is connected with the concrete pile, and the anchor rod can adopt and be connected with the concrete pile with the same mode of steel pipe down, and the effect of firm soil layer after anchor rod and concrete pile are connected is better down.
Further, the lower anchor rod is a prestressed anchor rod, prestress is applied to the lower anchor rod between the lower soil nailing wall and the concrete pile, after the pouring completion strength of the lower soil nailing wall reaches the design requirement, tension is applied to the lower anchor rod, an anchor backing plate is matched, force applied to the concrete pile direction is generated to the soil nailing wall, the wall body is stabilized, and collapse is prevented.
Furthermore, the large-scale deep foundation pit supporting construction structure also comprises a water-stop sheet and an upper anchor rod, wherein the water-stop sheet is arranged on the surface of the upper soil nailing wall, the water-stop sheet is horizontal to the side slope, the deep foundation pit supporting facilities are placed in the open air and often meet the raining condition, if rainwater directly falls on the upper soil nailing wall, the rainwater easily permeates into the soil layer where the side slope is located, the pressure on the upper soil nailing wall can be increased after the soil layer absorbs water, the soil layer is easily collapsed, the water-stop sheet is designed, the rainwater flows down along the water-stop sheet after raining, the soil layer where the side slope is located is prevented from being wetted by the water, the water-stop sheet can be installed when the concrete is not solidified before the upper soil nailing wall is poured, the water is directly fixed on the upper soil nailing wall through the concrete, the upper anchor rod penetrates through the water-stop sheet and the upper soil nailing wall and is connected with the concrete, the drainage system is arranged in the foundation pit, drainage of underground water or rainwater in the foundation pit is facilitated, or the automatic pumping device is arranged at the edge of the foundation pit and connected with the ground drainage system, and the pumping device is automatically started after the underground water or rainwater enables the water level in the foundation pit to reach a certain depth, so that water in the foundation pit is pumped out and drained into the ground drainage system.
Furthermore, the large deep foundation pit supporting construction structure also comprises a pressure display device, the pressure display device is connected with the side surface of the foundation pit and is used for displaying the pressure value inside a soil layer where the side surface of the foundation pit is located, the pressure display device is provided with a plurality of pressure display devices in the vertical direction, the pressure display device can be set as a voltage force display device and also can be provided with a main rod, a spring plate arranged in the soil layer, a big gear connected with the spring plate, a connecting rod, a small gear and an opening and closing plate connected with the small gear, the main rod is hinged with the spring plate and the opening and closing plate, a switch can be arranged on the spring plate, the spring plate can be closed by penetrating the spring plate into the soil layer, the switch controls the spring plate to generate the opening and closing trend after penetrating the spring plate into the soil layer, the spring plate can drive the big, the rotation that the shell fragment is tiny can transmit for the piece that opens and shuts through gear wheel, connecting rod, pinion, makes the piece that opens and shuts produce great rotation, can show the inside pressure of soil layer through the piece that opens and shuts degree, sets up a plurality of pressure display device, when the pressure sudden change in soil layer inside, can discover as early as possible, prevents that the soil layer from collapsing.
Further, the angle between the side slope and the ground is set to be 75-45 degrees, collapse easily occurs when the angle between the side slope and the ground is too large, and other buildings in the foundation pit are inconvenient to arrange when the angle is too small.
A large-scale deep foundation pit supporting construction method is designed, and comprises the following steps:
s1, building concrete pile: determining the depth of a foundation pit and the position of a side slope, drilling a hole on a pavement, wherein the depth of the hole is greater than that of the foundation pit, arranging a reinforcement cage in the hole, pouring concrete into a concrete pile, constructing the part of the concrete pile, which is higher than the ground, by using the concrete and reinforcing steel bars, wherein the concrete pile penetrates into a soil layer, and after the side slope and the foundation pit are dug, the soil layer is stabilized, a crown beam for connecting piles can be dug and designed on the ground, and a plurality of concrete piles are connected through pile crown beams;
s2, building a soil nailing wall: digging out a side slope by using an excavator, drilling holes on the side slope by using soil nails, connecting the drilled soil nails by using reinforcing steel bars, and spraying concrete to manufacture a soil nailing wall, wherein the soil nailing wall plays a role in stabilizing the side slope and prevents the side slope from collapsing;
s3, building crown beam and concrete support column: after the soil nailing wall is built, drilling the ground below the side slope by using a drilling machine, wherein the depth of the hole is greater than the vertical height of the side surface of the foundation pit, placing a steel reinforcement cage in the hole and pouring a concrete support column, wherein the specific depth of the hole is determined according to the concrete conditions such as the on-site soil quality, the depth of a foundation pit and the like, the arranged concrete support column is arranged to enter rock, installing a crown beam template on the upper part of a concrete support column, binding crown beam reinforcing steel bars, pouring concrete, removing the crown beam template after the crown beam is formed, connecting the concrete support column and the crown beam into a whole, connecting the concrete support column serving as a foundation pit support column with the side surface of the foundation pit, arranging prestressed reinforcing steel bars at the part of a soil layer at the side surface of the foundation pit, arranging the crown beam, after the strength of the crown beam meets the design requirement, prestress is applied to connect the crown beam and the concrete support column into a whole, and the crown beam and the concrete support column can also greatly prevent the collapse of a soil layer;
s4, building blocking facilities: inserting a plurality of steel pipes at the bottom of the side slope, wherein the lower ends of the steel pipes penetrate into the soil layer, the upper ends of the steel pipes are arranged outside the soil layer, connecting the upper ends of the steel pipes with the top of the concrete pile by using steel wires, enabling the steel wires to be in a tensioned state, fixing the blocking nets on the plurality of steel pipes, and forming a stable triangle by the steel pipes, the steel wires and the concrete pile which penetrate into the soil layer, so that the soil layer is further stabilized, and the side slope is prevented;
s5, constructing a lower soil nailing wall: the excavator is used for excavating the foundation pit to the bottom of the foundation pit, the side face of the foundation pit is drilled by the soil nails, the drilled soil nails are connected by the reinforcing steel sheets and are made into a lower soil nail wall by spraying concrete, and the lower soil nail wall stabilizes the side face of the foundation pit and prevents the side face of the foundation pit from collapsing.
Further, in the step S1, after the steel reinforcement cage is placed in the hole, the steel pipe in the step S4 is inserted into the gap between the steel reinforcement cages, and then the steel reinforcement cage and the steel pipe inserted into the steel reinforcement cage are cast into a whole with concrete, the steel pipe and the concrete pile are integrally formed, and a triangle formed by the steel pipe, the steel wire and the concrete pile can bear a larger force, so that the soil layer is further stabilized.
The positive and beneficial technical effects of the invention comprise:
(1) the concrete pile penetrating through the soil layer where the side slope and the side face of the foundation pit are located is arranged, and can bear force, so that the force directly borne by the soil layer where the side slope is located is reduced, the stress capability of the soil layer is improved, the soil layer can be stabilized, and the soil layer is prevented from collapsing;
(2) the steel pipes, the steel wires and the blocking nets which penetrate into the soil layer are arranged to form a stable structure together with the concrete piles, so that the soil layer is further stabilized, and the blocking nets are arranged on the steel pipes, so that a large-area protective building is not required to be arranged on the bottom surface of a foundation pit, materials are saved, and construction is facilitated;
(3) arranging an upper anchor rod and a lower anchor rod to further stabilize the side slope and the side surface of the foundation pit;
(4) a plurality of pressure display devices are arranged in the vertical direction of the soil layer, so that when pressure in the soil layer changes suddenly, the pressure display devices can find the pressure in the soil layer in time, measures are taken, and accidents are reduced;
(5) the invention designs a large-scale deep foundation pit supporting construction structure by arranging a road surface, a side slope, a side surface of a foundation pit, an upper soil nailing wall arranged on the surface of the side slope, a lower soil nailing wall arranged on the side surface of the foundation pit, a crown beam, a concrete support column, a concrete pile arranged on the road surface, a steel pipe, a blocking net and a steel wire, and provides a large-scale deep foundation pit supporting construction method, thereby solving the technical problems of insecure supporting and large occupied area of a protective net in the deep foundation pit construction process in the prior art.
Other advantageous effects of the present invention will be further described with reference to the following specific examples.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a perspective view of a portion of the structure of the present invention;
FIG. 3 is an enlarged cross-sectional view of the pressure display apparatus 1:10 of the present invention;
FIG. 4 is a flow chart of the present invention;
in the figure, 1, road surface; 2. side slope; 3. the side surface of the foundation pit; 4. mounting a soil nailing wall; 5. a soil nailing wall is arranged; 6. a crown beam; 7. a concrete support column; 8. concrete piles; 9. a steel pipe; 10. blocking; 11. a steel wire; 12. a lower anchor rod; 13. a water-stop sheet; 14. an anchor rod is arranged; 15. a pressure display device; 16. a main rod; 17. a spring plate; 18. a bull gear; 19. a connecting rod; 20. a pinion gear; 21. and (4) opening and closing the sheet.
Detailed Description
Example (b): a large-scale deep foundation pit supporting construction structure is shown in figures 1-4 and comprises a road surface 1, a side slope 2, a foundation pit side surface 3, an upper soil nailing wall 4 arranged on the surface of the side slope 2, a lower soil nailing wall 5 arranged on the foundation pit side surface 3, a crown beam 6, a concrete support column 7, a concrete pile 8 arranged on the road surface 1, a steel pipe 9, a blocking net 10 and a steel wire 11; the side face 3 of the foundation pit is arranged below the side slope 2, the side face 3 of the foundation pit can be arranged to be vertical to the ground for foundation geological soil with good soil quality and shallow depth, a certain included angle can be formed between the side face 3 of the foundation pit and the ground for a deep foundation pit with bad foundation geological condition or depth more than 5m, the specific included angle can be determined according to site construction conditions, the side slope 2 and the side face 3 of the foundation pit can be excavated by adopting an excavator, after a large excavator excavates the contour of the side slope 2 and the side face 3 of the foundation pit, the slope of the side slope 2 and the side face 3 of the foundation pit is manually matched with a small excavator to repair the slope, meanwhile, a slope ruler is used for controlling and checking the slope, whether the slope meets design requirements is checked, the slope surfaces of the formed side slope 2 and the side; the upper soil nailing wall 4 and the lower soil nailing wall 5 are made by pouring soil nails, reinforcing steel bars and concrete, the soil nails are installed by adopting horizontal drill drilling after the side slope 2 and the side face 3 of the foundation pit are formed, the hole forming angle is 15-20 degrees, the soil nails are bound by reinforcing steel bars meshes after hole forming, the reinforcing steel meshes adopt HPB300 reinforcing steel bars, phi 6@250 x 250, the thickness of a protective layer is 30mm, then panel concrete is sprayed, C20 fine stone concrete is sprayed from bottom to top by adopting air compression equipment in a segmented mode, the spraying process achieves that the spraying rebound quantity is small, the spraying layer strength is high, the spraying thickness is 80mm, when the slope faces of the side slope 2 and the side face 3 of the foundation pit are smooth, and the internal and external; the top beam 6 is connected with the side surface 3 of the foundation pit, the side surface 3 of the foundation pit can be provided with a prestressed anchor rod inserted into a soil layer of the side surface 3 of the foundation pit, when the top beam 6 is installed, the top beam 6 is made of reinforced concrete poured steel bars, the anchor rod penetrates through the top beam 6, after the pouring strength of the top beam 6 reaches the design requirement, the anchor rod is tensioned and prestressed, and an anchor backing plate is installed for fixation; the concrete support column 7 is connected with the top beam 6, the side surface 3 of the foundation pit, the lower soil nailing wall 5 and the bottom surface of the foundation pit, the concrete support column 7 is vertically drilled downwards, a reinforcement cage is placed after forming, the support column is poured, the foundation pit is dug after the concrete strength meets the design requirement, and the concrete support column 7 is tightly attached to the side slope 2; the concrete piles 8 are perpendicular to the ground and penetrate through soil layers in the direction perpendicular to the side slope 2 and the side face 3 of the foundation pit, the top of each concrete pile 8 is higher than the road surface 1, the concrete piles 8 can be built adjacent to the edge of the road surface 1 and are close to the side slope 2 and the edge of the road surface 1, a blocking net beside the road surface 1 can be arranged on the inner side of each concrete pile 8, a dense mesh net can be used as the blocking net beside the road surface 1, a plurality of concrete piles 8 can be arranged along the road surface 1, the specific number and the spacing of the concrete piles 8 can be designed according to the soil layer condition, the depth of the foundation pit and the like, the distance between each concrete pile 8 and the side slope 2 is equal, crown beams 6 for connecting piles can be excavated and designed on the ground, and; the steel pipes 9 are arranged in a plurality of numbers, the length, the height and the angle of each steel pipe 9 are the same, the steel pipes 9 are arranged at the joint of the side slope 2 and the side face 3 of the foundation pit, the steel pipes 9 can be arranged to form a 90-degree angle with the side slope 2, the lower parts of the steel pipes 9 are arranged in the soil layer, and the upper parts of the steel pipes are arranged outside the soil layer; the barrier net 10 is arranged among the steel pipes 9 and is bound and connected with the upper parts of the steel pipes 9, and the barrier net 10 can be a rope net; the upper portion of steel pipe 9 and concrete pile 8's top are connected to steel wire 11, steel wire 11 can be in tight state, there is oblique ascending pulling force to steel pipe 9, steel pipe 9 plays the supporting role to the fag end, the steel pipe 9 that sets up many vertically concrete pile 8 and insert the soil layer to one side in the soil layer can play the effect firm to the soil layer, the decompression, prevent that the soil layer from collapsing, the degree of depth that concrete pile 8 set up is greater than the total of side slope 2 and 3 vertical height in foundation ditch side, can further prevent that the soil layer from collapsing.
In this embodiment, steel pipe 9's lower part is connected with concrete pile 8, can be after concrete pile 8 places the steel reinforcement cage, in inserting the steel pipe 9 lower part into the space between the steel reinforcement cage before pouring, then pour concrete pile 8, concrete pile 8 pours as an organic wholely with steel pipe 9, it is connected with concrete pile 8 to set up steel pipe 9, concrete pile 8, steel pipe 9, steel wire 11 forms stable triangle-shaped structure, firm slope 2's effect is better, the soil layer is difficult to collapse more.
In this embodiment, large-scale deep basal pit supporting construction structures still includes the lower stock 12 of setting in foundation ditch side 3, the stock 12 runs through soil nailing wall 5 down, and one end setting is in the soil horizon, and the other end setting is in the soil nailing wall 5 outside down, sets up stock 12 down, further stabilizes soil nailing wall, and the stock 12 can further stabilize the soil horizon down simultaneously.
In this embodiment, anchor 12 sets up with ground level down, and the one end that sets up in the soil horizon is connected with concrete pile 8, and anchor 12 can adopt and be connected with concrete pile 8 with the same mode of steel pipe 9 down, and anchor 12 is connected the effect of the firm soil layer after with concrete pile 8 better down.
In this embodiment, the lower anchor rod 12 is a prestressed anchor rod, a prestress is applied to the lower anchor rod 12 between the lower soil nailing wall 5 and the concrete pile 8, and after the pouring of the lower soil nailing wall 5 is completed and the strength reaches the design requirement, a pulling force is applied to the lower anchor rod 12, and an anchor backing plate is matched to generate a force applied to the concrete pile 8 direction on the soil nailing wall, so that the wall body is stabilized, and meanwhile, a soil layer can be stabilized, and the soil layer stress capacity is increased.
In this embodiment, the large deep foundation pit supporting construction structure further includes a water-stop sheet 13 and an upper anchor 14, the water-stop sheet 13 is disposed on the surface of the upper soil nailing wall 4, the water-stop sheet 13 is horizontal to the side slope 2, the deep foundation pit supporting facilities are placed in the open air, and often under the rain condition, if the rain water falls directly onto the upper soil nailing wall 4, the rain water easily permeates into the soil layer where the side slope 2 is located, the pressure on the upper soil nailing wall 4 is increased after the soil layer absorbs water, the soil layer is unstable, and the slope is easily collapsed, the water-stop sheet 13 is designed, the rain water flows down along the water-stop sheet 13 after the rain, the soil layer where the side slope 2 is located is prevented from being wetted by the water, the soil layer is prevented from collapsing, the water-stop sheet 13 can be installed when the upper soil nailing wall 4 is poured and the concrete is not solidified, the water-stop sheet 13 is directly fixed on the upper soil nailing wall 4 by the concrete, the water-stop sheet 13 can be adhered, and is connected with concrete pile 8, the upper anchor rod 14 can also play a fixed role to the water-stop sheet 13, can also set up the drainage pipe in the soil horizon where the side slope 2, 3 vertical directions of foundation ditch side are located, help to discharge rainwater from the soil horizon, set up the drainage system among the prior art in the foundation ditch, facilitate the drainage of groundwater or rainwater in the foundation ditch, or set up the automatic pumping device and connect with ground drainage system in the foundation ditch, the automatic starting of pumping device after groundwater or rainwater make the water level reach certain depth in the foundation ditch, take the water in the foundation ditch out and discharge into the drainage system where the ground locates.
In this embodiment, the large deep foundation pit supporting construction structure further includes a pressure display device 15, the pressure display device 15 is connected to the side surface 3 of the foundation pit and is configured to display a pressure value inside a soil layer where the side surface 3 of the foundation pit is located, the pressure display device 15 is provided in a plurality in the vertical direction, the pressure display device 15 may be a voltage display device 15, or may be provided with a main rod 16, a resilient piece 17 disposed in the soil layer, a large gear 18 connected to the resilient piece 17, a connecting rod 19, a small gear 20, and an opening and closing piece 21 connected to the small gear 20, the main rod 16 is hinged to the resilient piece 17 and the opening and closing piece 21, the resilient piece 17 may be provided with a switch, the resilient piece 17 is closed before penetrating into the soil layer, the resilient piece 17 penetrates into the soil layer and then controls the opening and closing tendency of the resilient piece 17, the resilient piece 17 rotates, the teeth of a cogwheel and gear wheel 18, the meshing of pinion 20, pinion 20 rotates and can drive the piece 21 that opens and shuts and rotate for mobile jib 16, and the small rotation of shell fragment 17 can pass through gear wheel 18, connecting rod 19, pinion 20 transmits for the piece 21 that opens and shuts, makes the piece 21 that opens and shuts produce great rotation, can show the inside pressure in soil layer through the piece 21 degree of opening and shutting, sets up a plurality of pressure display device 15, when the inside pressure sudden change in soil layer, can discover early, prevent that the soil layer from collapsing.
In this embodiment, the angle between the side slope 2 and the ground is set to 75 degrees to 45 degrees, the angle between the side slope 2 and the ground is too large, collapse is easy to happen, and the angle is too small and other buildings in the foundation pit are inconvenient to set.
A large-scale deep foundation pit supporting construction method is designed, and comprises the following steps:
s1, building concrete pile 8: determining the depth of a foundation pit and the position of a side slope 2, drilling a hole in a pavement 1, wherein the depth of the hole is greater than the total depth of the foundation pit, arranging a reinforcement cage in the hole, pouring concrete into a concrete pile 8, building the part of the concrete pile 8, which is higher than the ground, by using the concrete and reinforcing steel bars, and making the concrete pile 8 go deep into a soil layer, so that the side slope 2 and the foundation pit are dug, the soil layer is stabilized, a crown beam 6 for connecting piles can be dug and designed on the ground, and a plurality of concrete piles 8 are connected through pile crown beams 6;
s2, building soil nailing wall 4: digging out the side slope 2 by using an excavator, drilling holes on the side slope 2 by using soil nails, connecting the drilled soil nails by using reinforcing steel sheets and spraying concrete to manufacture a soil nailing wall 4, wherein the soil nailing wall 4 plays a role in stabilizing the side slope 2 and preventing the side slope 2 from collapsing;
s3, building crown beam 6 and concrete support column 7: after the soil nailing wall 4 is built, a drilling machine is used for drilling the soil layer below the side slope 2, the depth of the hole is greater than the vertical height of the side surface 3 of the foundation pit, placing a steel reinforcement cage in the hole and pouring a concrete support pillar 7, wherein the specific depth of the hole is determined according to the concrete conditions such as the on-site soil quality, the depth of a foundation pit and the like, the arranged concrete support pillar 7 is arranged in rock, installing a crown beam 6 template on the upper part of a concrete support column 7, binding a crown beam 6 reinforcing steel bar, pouring concrete, removing the crown beam 6 template after the crown beam 6 is formed, connecting the concrete support column 7 and the crown beam 6 into a whole, connecting the concrete support column 7 as a foundation pit support column with the side surface 3 of the foundation pit, or arranging prestressed reinforcing steel bars at the part of the soil layer of the side surface 3 of the foundation pit where the crown beam 6 is arranged, after the strength of the crown beam 6 meets the design requirement, prestress is applied to connect the crown beam 6 and the concrete support column 7 into a whole, and the crown beam 6 and the concrete support column 7 can also greatly prevent the soil layer from collapsing;
s4, building blocking facilities: inserting a plurality of steel pipes 9 into the bottom of the side slope 2, enabling the lower ends of the steel pipes 9 to go deep into a soil layer, enabling the upper ends of the steel pipes 9 to be arranged outside the soil layer, connecting the upper ends of the steel pipes 9 with the top of the concrete pile 8 by using steel wires 11, enabling the steel wires 11 to be in a tensioned state, fixing the blocking nets 10 on the plurality of steel pipes 9, enabling the steel pipes 9 going deep into the soil layer, the steel wires 11 and the concrete pile 8 to form a stable triangular structure, further stabilizing the soil layer, and preventing the side slope 2 from collapsing;
s5, constructing a lower soil nailing wall 5: the excavator is used for excavating the foundation pit to the bottom of the foundation pit, the side face of the foundation pit is drilled by the soil nails, the drilled soil nails are connected by the reinforcing steel sheets and are made into the lower soil nail wall 4 by spraying concrete, the lower soil nail wall 5 stabilizes the side face 3 of the foundation pit, and the side face 3 of the foundation pit is prevented from collapsing.
In this embodiment, in the step S1, after the steel reinforcement cage is placed in the hole, the steel pipe 9 in the step S4 is inserted into the gap between the steel reinforcement cages, and then the steel reinforcement cage and the steel pipe 9 inserted into the steel reinforcement cage are cast with concrete to form a whole, the steel pipe 9 and the concrete pile 8 are integrally formed, and a triangle formed by the steel pipe 9, the steel wire 11 and the concrete pile 8 can bear a larger force, so as to further stabilize the soil layer.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a large-scale deep basal pit supporting construction structures which characterized in that: the concrete pile foundation comprises a pavement, a side slope, a foundation pit side face, an upper soil nailing wall arranged on the surface of the side slope, a lower soil nailing wall arranged on the side face of the foundation pit, a crown beam, a concrete support column, a concrete pile arranged on the pavement, a steel pipe, a blocking net and a steel wire; the side face of the foundation pit is arranged below the side slope; the upper soil nailing wall and the lower soil nailing wall are made by pouring soil nails, reinforcing steel bars and concrete; the crown beam is connected with the side surface of the foundation pit; the concrete support column is connected with the crown beam, the side surface of the foundation pit, the lower soil nailing wall and the bottom surface of the foundation pit; the concrete pile is vertical to the ground and penetrates through soil layers in the vertical direction of the side slopes and the side faces of the foundation pit, and the top of the concrete pile is higher than the road surface; the steel pipes are arranged at the joints of the side slopes and the side faces of the foundation pit, the lower parts of the steel pipes are arranged in the soil layer, and the upper parts of the steel pipes are arranged outside the soil layer; the blocking net is arranged among the steel pipes and is connected with the upper parts of the steel pipes; the steel wire is connected with the upper part of the steel pipe and the top of the concrete pile.
2. A large-sized deep foundation pit supporting construction structure according to claim 1, wherein: the lower part of the steel pipe is connected with the concrete pile.
3. A large-sized deep foundation pit supporting construction structure according to claim 2, wherein: the anchor rod penetrates through the lower soil nailing wall, one end of the anchor rod is arranged in the soil layer, and the other end of the anchor rod is arranged on the outer side of the lower soil nailing wall.
4. A large-sized deep foundation pit supporting construction structure according to claim 3, wherein: the lower anchor rod is horizontally arranged with the ground, and one end of the lower anchor rod arranged in the soil layer is connected with the concrete pile.
5. A large-scale deep foundation pit supporting construction structure according to claim 4, characterized in that: the lower anchor rod is a prestressed anchor rod, and prestress is applied to the lower anchor rod between the lower soil nailing wall and the concrete pile.
6. A large-scale deep foundation pit supporting construction structure according to claim 5, characterized in that: still include water-stop sheet and go up the stock, the water-stop sheet sets up on soil nail wall surface, water-stop sheet and side slope level, it runs through water-stop sheet and soil nail wall to go up the stock, and is connected with the concrete pile.
7. A large-scale deep foundation pit supporting construction structure according to claim 6, characterized in that: the pressure display device is connected with the side face of the foundation pit and used for displaying the pressure value inside a soil layer where the side face of the foundation pit is located, and the pressure display device is arranged in a plurality in the vertical direction.
8. A large-scale deep foundation pit supporting construction structure according to claim 7, characterized in that: the angle of the side slope and the ground is set to be 75-45 degrees.
9. A large deep foundation pit supporting construction method is characterized by comprising the following steps:
s1, building concrete pile: determining the depth of a foundation pit and the position of a side slope, drilling a hole in the pavement, wherein the depth of the hole is greater than the depth of the foundation pit, arranging a reinforcement cage in the hole, pouring concrete into a concrete pile, and building the part of the concrete pile, which is higher than the ground, by using the concrete and reinforcing steel bars;
s2, building a soil nailing wall: digging out a side slope by using an excavator, drilling holes on the side slope by using soil nails, connecting the drilled soil nails by using steel bars, and spraying concrete to manufacture a soil nailing wall;
s3, building crown beam and concrete support column: drilling a hole by using a drilling machine, wherein the depth of the hole is greater than the vertical height of the side face of the foundation pit, placing a reinforcement cage in the hole to pour a concrete support column, then installing a crown beam template on the upper part of the concrete support column, binding crown beam reinforcements, placing the crown beam reinforcements in the crown beam template to pour, removing the crown beam template after the crown beam is formed, and connecting the concrete support column with the side face of the foundation pit;
s4, building blocking facilities: inserting a plurality of steel pipes at the bottom of the side slope, inserting the lower ends of the steel pipes into the soil layer, arranging the upper ends of the steel pipes outside the soil layer, connecting the upper ends of the steel pipes with the top of the concrete pile by using steel wires, enabling the steel wires to be in a tensioned state, and fixing the blocking nets on the steel pipes;
s5, constructing a lower soil nailing wall: and excavating the foundation pit to the bottom of the foundation pit by using an excavator, drilling holes on the side surface of the foundation pit by using soil nails, connecting the drilled soil nails by using reinforcing steel bars, and spraying concrete to manufacture a lower soil nail wall and an upper soil nail wall.
10. A large-sized deep foundation pit support construction method according to claim 9, wherein: the step S1 further includes, after the steel reinforcement cages are placed in the holes, inserting the steel pipes into the gaps between the steel reinforcement cages in the step S4, and then pouring the steel reinforcement cages and the steel pipes inserted into the steel reinforcement cages into a whole with concrete.
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| CN202010262342.6A CN112211199A (en) | 2020-04-06 | 2020-04-06 | Large deep foundation pit supporting construction structure and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174961A (en) * | 2021-03-31 | 2021-07-27 | 中海建筑有限公司 | Side slope foundation pit supporting method |
| CN113235615A (en) * | 2021-05-27 | 2021-08-10 | 中交投资咨询(北京)有限公司 | Deep foundation pit reinforcing device and construction method thereof |
| CN113279604A (en) * | 2021-06-09 | 2021-08-20 | 广州市鲁班建筑科技集团股份有限公司 | External protection connecting structure for ancient tomb translation and construction method |
| CN113417293A (en) * | 2021-05-28 | 2021-09-21 | 陶琳 | Building construction deep basal pit bearing structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007277979A (en) * | 2006-04-10 | 2007-10-25 | Tokyo Seiko Co Ltd | Anchor for suspension structure on slope |
| CN204418187U (en) * | 2014-12-31 | 2015-06-24 | 广东省重工建筑设计院有限公司 | Subway protection region soil nail wall is in conjunction with double-row pile deep foundation ditch composite supporting construction |
| CN105926639A (en) * | 2016-06-28 | 2016-09-07 | 南华大学 | Supporting system and monitoring method of foundation pit near city expressway |
| CN106049558A (en) * | 2016-05-26 | 2016-10-26 | 东北大学 | Comprehensive pipe gallery information pre-warning system and method |
| CN106677192A (en) * | 2017-03-03 | 2017-05-17 | 周同和 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
| CN206844130U (en) * | 2017-06-26 | 2018-01-05 | 中国葛洲坝集团三峡建设工程有限公司 | A kind of scaffold is encorbelmented protector |
| CN110685286A (en) * | 2019-10-22 | 2020-01-14 | 中铁八局集团第四工程有限公司 | Deep foundation pit supporting construction process for adjacent road under complex geological condition |
-
2020
- 2020-04-06 CN CN202010262342.6A patent/CN112211199A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007277979A (en) * | 2006-04-10 | 2007-10-25 | Tokyo Seiko Co Ltd | Anchor for suspension structure on slope |
| CN204418187U (en) * | 2014-12-31 | 2015-06-24 | 广东省重工建筑设计院有限公司 | Subway protection region soil nail wall is in conjunction with double-row pile deep foundation ditch composite supporting construction |
| CN106049558A (en) * | 2016-05-26 | 2016-10-26 | 东北大学 | Comprehensive pipe gallery information pre-warning system and method |
| CN105926639A (en) * | 2016-06-28 | 2016-09-07 | 南华大学 | Supporting system and monitoring method of foundation pit near city expressway |
| CN106677192A (en) * | 2017-03-03 | 2017-05-17 | 周同和 | Row pile anchoring cement soil pile continuous wall supporting structure and construction process thereof |
| CN206844130U (en) * | 2017-06-26 | 2018-01-05 | 中国葛洲坝集团三峡建设工程有限公司 | A kind of scaffold is encorbelmented protector |
| CN110685286A (en) * | 2019-10-22 | 2020-01-14 | 中铁八局集团第四工程有限公司 | Deep foundation pit supporting construction process for adjacent road under complex geological condition |
Non-Patent Citations (1)
| Title |
|---|
| 曹友杰等: "郑州郑东新区某深基坑桩锚支护施工与监测", 《探矿工程/岩土钻掘工程》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174961A (en) * | 2021-03-31 | 2021-07-27 | 中海建筑有限公司 | Side slope foundation pit supporting method |
| CN113235615A (en) * | 2021-05-27 | 2021-08-10 | 中交投资咨询(北京)有限公司 | Deep foundation pit reinforcing device and construction method thereof |
| CN113417293A (en) * | 2021-05-28 | 2021-09-21 | 陶琳 | Building construction deep basal pit bearing structure |
| CN113417293B (en) * | 2021-05-28 | 2023-09-05 | 华中伟业建设集团有限公司 | Deep foundation pit supporting structure for building construction |
| CN113279604A (en) * | 2021-06-09 | 2021-08-20 | 广州市鲁班建筑科技集团股份有限公司 | External protection connecting structure for ancient tomb translation and construction method |
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