CN220847623U - Integrated foundation pit supporting structure for building engineering construction - Google Patents
Integrated foundation pit supporting structure for building engineering construction Download PDFInfo
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- CN220847623U CN220847623U CN202420552853.5U CN202420552853U CN220847623U CN 220847623 U CN220847623 U CN 220847623U CN 202420552853 U CN202420552853 U CN 202420552853U CN 220847623 U CN220847623 U CN 220847623U
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 72
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 174
- 239000010959 steel Substances 0.000 claims abstract description 174
- 239000004567 concrete Substances 0.000 claims abstract description 64
- 239000002689 soil Substances 0.000 claims abstract description 17
- 238000004080 punching Methods 0.000 claims description 32
- 239000004568 cement Substances 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 239000011150 reinforced concrete Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 7
- 239000004570 mortar (masonry) Substances 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 10
- 238000005553 drilling Methods 0.000 description 7
- 239000003673 groundwater Substances 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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Abstract
The utility model relates to the field of foundation pit supporting structures, in particular to an integrated foundation pit supporting structure for construction of constructional engineering, which comprises a bored pile, a steel pipe, a punched steel plate, an enclosing purlin, a diagonal supporting structure and a waterproof curtain; according to the utility model, the steel reinforced concrete supporting structure of the side wall of the foundation pit is formed by the steel pipes, the punched steel plates and concrete poured among the pipes, compared with the traditional stirring pile supporting structure, the concrete and mortar consumption is saved, meanwhile, the steel pipes provide larger rigidity, the steel structural members in the scheme are easier to strip than steel reinforced concrete supporting structures such as SMW (soil mixing wall) construction piles and the like after being recovered, the punched steel plates are inserted into the side wall of the foundation pit for pressure grouting and permeation to form a waterproof curtain mortar layer which is in transverse connection with the supporting structure, so that the stability between the supporting structure and the side wall of the foundation pit is further improved while water seepage is avoided, and the problems that the existing deep foundation pit supporting structure is large in material consumption, easy in water seepage of the foundation pit and difficult in steel recovery of the supporting structure in a steel reinforced concrete form are solved.
Description
Technical Field
The utility model relates to the field of foundation pit supporting structures, in particular to an integrated foundation pit supporting structure for building engineering construction.
Background
In the construction field of building engineering, the foundation pit with the excavation depth exceeding 5 meters or the depth not exceeding 5 meters is often faced, but the geological conditions, the surrounding environment and underground pipelines are particularly complex, so that the foundation pit or the underground structure of the building is constructed, and in order to ensure the safety of the construction of the foundation pit, the periphery of the foundation pit is required to be constructed as a supporting structure, so that accidents caused by collapse of the foundation pit are prevented.
The existing deep and large foundation pit supports have various modes, such as cement stirring pile supports, steel pipe pile supports, SMW construction method pile supports and the like, and the supporting structures have the characteristics of high strength and rigidity and good supporting effect, but for the cement stirring pile, the construction cost is high, the material consumption is large and the steel pipe pile supports are not recyclable, structural gaps exist in the steel pipe pile supports, foundation pit water seepage is easy to occur, the SMW construction method pile adopts a supporting mode of combining section steel and concrete, the section steel can be stripped and recovered after construction is finished, but the section steel is spliced in the concrete, the section steel is tightly combined with the concrete, and stripping work is difficult.
Therefore, aiming at a plurality of problems existing in the existing deep and large foundation pit supporting form, an integrated supporting structure based on combination of steel pipes and steel sheet piles can be designed, and concrete is poured between the steel pipes and the steel sheets in a matching manner, so that stripping and recycling of steel after construction is finished are facilitated.
Disclosure of utility model
In order to solve the problems that the existing deep and large foundation pit supporting structure has large material consumption, the foundation pit is easy to permeate water and steel materials of the supporting structure in a steel-concrete form are not easy to recover.
The technical scheme of the utility model is as follows: the integrated foundation pit supporting structure for building engineering construction comprises bored piles, steel pipes, punched steel plates, enclosing purlins, diagonal supporting structures and waterproof curtains; the bored pile is positioned at four corners of a foundation pit, the pile bottom stretches into 50cm-100cm below the design elevation of the foundation pit bottom, Q235B steel pipes with the pipe diameter of 60-80cm are distributed along the side wall of the foundation pit at intervals of 30cm-50cm, punching steel plates are longitudinally welded and fixed at equal intervals on two sides of the steel pipes positioned on the same axis, the intervals between adjacent punching steel plates are 15cm-45cm, concrete is poured and filled between the steel pipes, surrounding purlins positioned at the top surface of the foundation pit are poured at the upper ends of the steel pipes positioned on the same axis, four surrounding purlins positioned at the top surface of the foundation pit are integrally poured into an integral rectangular frame structure, the inner wall of each surrounding purlin is poured and molded into a diagonal supporting structure consisting of two mutually-intersected rectangular concrete frames, and a waterproof curtain formed by pressure grouting is arranged on one side of the steel pipes facing the side wall of the foundation pit.
Preferably, before the foundation pit is constructed, drilling bored concrete piles are laid out at four corners of the foundation pit, after the grooves are dug along two adjacent drilling bored concrete piles, welding components of steel pipes and punching steel plates are installed, when the top of the foundation pit is dug, a diagonal bracing structure is firstly applied as a pit top supporting structure, holes on the side wall of the foundation pit are drilled through holes on the punching steel plates while the layer-by-layer excavation is continued, a waterproof curtain is formed by pressure grouting, concrete is poured between the steel pipes, and the waterproof curtain is connected with the drilling bored concrete piles to form a whole, so that the drilling bored concrete piles, the steel pipes, the punching steel plates and the concrete between the steel pipes are connected, and a cement slurry anchor rod between the punching steel plates and the waterproof curtain forms an integrated steel-concrete supporting structure.
Preferably, the depth of the foundation pit is 5m-7m, the pile bottom of the bored pile penetrates 50cm below the design elevation of the foundation pit bottom, the steel pipe is a Q235B steel pipe 2 with the pipe diameter of 60cm, the transverse distance between the outer walls of two adjacent steel pipes is 50cm, the longitudinal distance is 45cm, the two sides of the outer walls of the steel pipes on the same axis are welded and fixed by punching steel plates, C25 concrete is poured and filled between the pipes, the diameter of holes on the punching steel plates is 8cm-10cm, for the deep foundation pit with the depth of about 5m-7m, the underground water level is lower, the influence is smaller, the consumption of materials is saved, the distance between the steel pipes and the distance between the punching steel plates can be adjusted, C25 plain concrete is used for completely filling the gap between the steel pipes and the punching steel plates, and the wall supporting structure with the strength and rigidity being enough to resist the soil pressure of the side wall of the foundation pit is formed.
Preferably, the depth of the foundation pit is 7m-13m, the pile bottom of the bored pile penetrates 100cm below the design elevation of the foundation pit bottom, the steel pipe is a Q235B steel pipe with the pipe diameter of 80cm, the transverse distance between the outer walls of two adjacent steel pipes is 30cm, the punching steel plates with the longitudinal distance of 15cm are welded and fixed on the two sides of the outer walls of the steel pipe on the same axis, C30 concrete is poured and filled between the pipes, the diameters of holes on the punching steel plates are 8cm-10cm, for the deep foundation pit with the depth of about 7m-13m, the underground water level is higher, the influence is larger, the distance between the steel pipes and the distance between the punching steel plates can be adjusted, C30 plain concrete with a larger number is used for ensuring the supporting strength, the gap between the steel pipes and the punching steel plates is completely filled, and the wall supporting structure with the strength and rigidity being enough to resist the soil pressure of the side wall of the foundation pit is formed.
Preferably, the height of the enclosing purlin is 30cm-60cm, the end part of the enclosing purlin is fixedly connected with the adjacent bored pile 1 in a pouring manner, and 8mm-14mm reinforcing steel bars are arranged in the connecting points, the bottom of the enclosing purlin is tied with the concrete between the pipes below the enclosing purlin through the 8mm-14mm reinforcing steel bars, the enclosing purlin is used for maintaining the stability of the top surface of a foundation pit, the top of the steel pipe at the same side is covered to form a whole, and the enclosing purlin is connected with the bored pile and the concrete between the pipes to form a sheet, so that a whole force transmission system is formed.
Preferably, the diagonal support structure comprises gussets and braces; the gusset pouring is connected at the inflection point of two adjacent enclosing purlins, two mutually crossed rectangular concrete frames are poured between four gussets and form a crossed pair of two concrete slab structures between the two adjacent gussets, the pair of the two concrete slab structures is integrally poured on the gussets at four corners of the foundation pit, and a crossed concrete beam is formed between the two adjacent gussets and has four fulcrums, so that the supporting effect is good.
Preferably, a grouting pipe penetrating through a 60cm-80cm of soil layer of the side wall of the foundation pit is inserted into a separation hole on a punched steel plate, cement slurry is injected into the grouting pipe, the cement slurry is penetrated into the soil layer of the side wall of the foundation pit in a crossing manner to form a waterproof curtain, the hole spacing on the punched steel plate is 50cm-80cm, the cement slurry is injected into the grouting pipe through a cement slurry pressure pumping machine at a pressure greater than 0.2MPA, the cement slurry penetrates into the soil layer of the side wall of the foundation pit under the action of the pressure, and is connected into a sheet to form the waterproof curtain, so that the underground water is prevented from penetrating into the foundation pit, or a supporting structure is disturbed.
As the preference, enclose pre-buried waterproof board of purlin upper end department near the foundation ditch lateral wall, the waterproof board is thickness 1mm-2 mm's Q235B steel sheet, and waterproof board top surface is in 50cm above the foundation ditch top surface design height, welded fastening between two adjacent waterproof board tip, and the waterproof board plays the water blocking effect to the foundation ditch top surface, avoids the rivers foundation ditch on ground, also avoids subaerial grit, and construction tool falls into the foundation ditch, causes constructor to hit the injury.
The utility model has the beneficial effects that:
1. The steel reinforced concrete supporting structure of the side wall of the foundation pit is formed by the steel pipes, the punched steel plates and concrete poured among the pipes, compared with the traditional stirring pile supporting, the consumption of concrete and mortar is saved, meanwhile, the steel pipes provide larger rigidity, the steel structural members in the scheme are compared with the steel reinforced concrete supporting structures such as SMW construction method piles and the like, because the concrete is filled among the steel pipes instead of wrapping the steel members, after the steel members are recovered, the concrete is stripped more easily, the punched steel plates are inserted into the pressure grouting for penetrating through the side wall of the foundation pit to form a waterproof curtain mortar layer with transverse connection with the supporting structure, and the stability between the supporting structure and the side wall of the foundation pit is further improved while water seepage is avoided;
2. Through pre-burying waterproof plates on the enclosing purlin, a circle of ground water blocking structure is formed on the top surface of the foundation pit, so that the ground water is prevented from flowing into the foundation pit, and the construction safety of the foundation pit is ensured;
3. The crossed rectangular opposite supporting structural members are integrally poured on the corner support pieces at the four corners of the foundation pit, and the crossed concrete beam is formed between two adjacent corner supports, so that four supporting points are provided, and the supporting effect is good.
Drawings
FIG. 1 shows a schematic view of a first three-dimensional structure of an integrated foundation pit supporting structure for construction of a building engineering according to the present utility model;
FIG. 2 is a schematic view showing a second perspective construction of the integrated foundation pit supporting structure for construction of the building engineering according to the present utility model;
FIG. 3 shows a schematic view of a cross-sectional perspective construction of an integrated foundation pit supporting structure for construction of a building engineering according to the present utility model;
FIG. 4 shows a schematic view of a first three-dimensional structure of a pit wall supporting structure of an integrated foundation pit supporting structure for construction of a building engineering according to the present utility model;
FIG. 5 shows a schematic diagram of a second perspective construction of a pit wall supporting structure of a building engineering construction integrated foundation pit supporting structure according to the present utility model;
Fig. 6 shows a schematic perspective view of a diagonal support structure of an integrated foundation pit support structure for construction of building engineering according to the present utility model.
Reference numerals illustrate: 1. drilling a filling pile; 2. a steel pipe; 3. punching a steel plate; 4. enclosing purlin; 6. grouting pipe; 7. a waterproof curtain; 8. a waterproof board; 501. a gusset; 502. and (5) opposite bracing.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
The concrete implementation mode is used for an integral foundation pit supporting structure for building engineering construction, referring to fig. 1-6, the foundation pit supporting structure comprises a bored pile 1, a steel pipe 2, a punched steel plate 3, an enclosing purlin 4, a diagonal supporting structure and a waterproof curtain 7; the method comprises the steps that a bored pile 1 is positioned at four corners of a foundation pit, the pile bottom penetrates 50cm-100cm below the design elevation of the pit bottom of the foundation pit, Q235B steel pipes 2 with the pipe diameter of 60-80cm are distributed along the side wall of the foundation pit at intervals of 30cm-50cm, punching steel plates 3 are longitudinally welded and fixed at equal intervals on two sides of the steel pipes 2 positioned on the same axis, 15cm-45cm are distributed among adjacent punching steel plates 3, concrete is poured between the steel pipes 2, an enclosing purlin 4 positioned at the top of the foundation pit is poured at the upper end of the steel pipes 2 positioned on the same axis, a rectangular frame structure is integrally poured on the four enclosing purlins 4 at the top of the foundation pit, a diagonal support structure consisting of two mutually-intersected rectangular concrete frames is formed on the inner wall of the enclosing purlins 4, a pressure grouting waterproof curtain 7 is arranged on one side of the steel pipes 2 facing the side wall of the foundation pit, before construction of the foundation pit, after the grooves are dug on the four corners of the foundation pit, welding members of the steel pipes 2 and the steel pipes 3 are installed, when the top of the foundation pit is dug, an angle support structure is firstly used as a top support structure, and the steel pipes 3 are sequentially cut, and cement slurry is continuously connected with the steel pipes 3 through the enclosing purlinking structures, and the steel pipes 3, and the waterproof curtain 7 are formed between the steel pipes 3 and the integral grouting structure, and the sealing curtain 7 is formed between the steel piles and the hole 3 and the hole structure and the hole.
Referring to fig. 3-5, in this embodiment, the depth of the foundation pit is 5m-7m, the pile bottom of the bored pile 1 is deeper than the designed elevation of the foundation pit bottom, the steel pipes 2 are Q235B steel pipes 2 with the pipe diameter of 60cm, the lateral distance between the outer walls of two adjacent steel pipes 2 is 50cm, the punching steel plates 3 with the longitudinal distance of 45cm are welded and fixed on two sides of the outer wall of the steel pipe 2 on the same axis, C25 concrete is poured and filled between the pipes, the diameters of holes on the punching steel plates 3 are 8cm-10cm, for the deep foundation pit with the depth of about 5m-7m, the groundwater level is lower, the influence is smaller, in order to save the material consumption, the distance between the steel pipes 2 and the distance between the punching steel plates 3 can be adjusted, the space between the steel pipes 2 and the punching steel plates 3 is completely filled with C25 plain concrete, the wall supporting structure with strength and rigidity sufficient to resist the soil pressure of the side wall of the foundation pit is formed, the depth of the foundation pit is 7m-13m, the pile bottom of the bored pile 1 is deeper than the designed elevation of the foundation pit bottom by 100cm, the steel pipe 2 is a Q235B steel pipe 2 with the pipe diameter of 80cm, the transverse distance between the outer walls of two adjacent steel pipes 2 is 30cm, the punching steel plates 3 with the longitudinal distance of 15cm are welded and fixed on the two sides of the outer wall of the steel pipe 2 on the same axis, C30 concrete is poured and filled between the pipes, the diameter of holes on the punching steel plates 3 is 8cm-10cm, for the deep foundation pit with the depth of about 7m-13m, the groundwater level is higher, the influence is larger, the spacing between the steel pipes 2 and the spacing between the punching steel plates 3 can be selectively adjusted to ensure the supporting strength, the gap between the steel pipes 2 and the punching steel plates 3 is completely filled with C30 plain concrete with a large mark, the wall supporting structure with strength and rigidity enough to resist the soil pressure of the side wall of the foundation pit is 30cm-60cm, the end part of the enclosing purlin 4 is fixedly connected with the adjacent cast-in-situ bored pile 1 in a pouring manner, and 8-14 mm steel bars are arranged in the connecting points, the bottom of the enclosing purlin 4 is tied with the concrete between the pipes below the enclosing purlin through the 8-14 mm steel bars, the enclosing purlin 4 is used for maintaining the stability of the top surface of a foundation pit, the top of the steel pipe 2 positioned on the same side is coated to form a whole, and the whole is connected with the cast-in-situ bored pile 1 and the concrete between the pipes to form a sheet, so that a whole force transfer system is formed.
Referring to fig. 6, in this embodiment, the diagonal support structure includes a gusset 501, a pair of braces 502; the corner supports 501 are poured and connected at the inflection points of the two adjacent enclosing purlins 4, two mutually-intersected rectangular concrete frames are poured between the four corner supports 501 and form two crossed concrete slab-shaped structural opposite supports 502 between the two adjacent corner supports 501, the opposite supports 502 are integrally poured on the corner supports 501 at the four corners of the foundation pit, and crossed concrete beams are formed between the two adjacent corner supports 501, so that the four supporting points are provided, and the supporting effect is good.
Referring to fig. 1, 2, 4 and 5, in this embodiment, a grouting pipe 6 penetrating into the soil layer of the side wall of the foundation pit is inserted into a spacer hole on a punched steel plate 3, cement slurry is injected into the grouting pipe 6 at a pressure of 60cm-80cm, the cement slurry is penetrated into the soil layer of the side wall of the foundation pit in a crossing manner to form a waterproof curtain 7, the hole spacing on the punched steel plate 3 is 50cm-80cm, cement slurry is injected into the grouting pipe 6 by a cement slurry pressure pumping machine at a pressure of more than 0.2MPA, cement slurry penetrates into the soil layer of the side wall of the foundation pit under the action of the pressure, the grouting pipes are connected to form a waterproof curtain 7, groundwater is prevented from penetrating into the foundation pit, or a supporting structure is disturbed, a waterproof plate 8 is embedded near the side wall of the foundation pit at the upper end of the surrounding purlin 4, the waterproof plate 8 is a Q235B steel plate with a thickness of 1mm-2mm, the top surface of the waterproof plate 8 is 50cm above the designed height of the top surface of the foundation pit, the two adjacent waterproof plates 8 are welded and fixed, the waterproof plates play a water role on the top surface, the foundation pit is avoided from entering the foundation pit, and the construction tools on the ground are prevented from falling down due to the damage caused by the construction tools on the ground.
Embodiment one:
When the excavation depth of the foundation pit is about 5m-7m, drilling holes at four corners of the foundation pit to construct bored piles 1, wherein the elevation of the pile bottom is 50cm below the design elevation of the foundation pit bottom, then excavating a groove between two adjacent bored piles 1, and hanging a pipe and plate combination part welded by a steel pipe 2 with the pipe diameter of 60cm and the pipe spacing of 50cm and a punched steel plate 3 with the longitudinal distance of 45cm into the groove;
Excavating foundation pit layer by layer, wherein the first excavation depth is 50cm, constructing an enclosing purlin 4, cladding the tops of the steel pipes 2 on the same side into a whole, connecting the whole with the bored pile 1 and the concrete between the pipes into a piece, reserving a steel bar head under the enclosing purlin 4 for waiting for the concrete between the connecting pipes, and embedding a waterproof board 8 on the enclosing purlin 4 for blocking water;
Then, a gusset 501 and a pair of braces 502 are applied to the enclosing purlin 4, and a horizontal support force transfer system is formed on the top surface of the foundation pit by using a concrete beam which forms a cross between the two gussets 501;
Continuously excavating downwards layer by layer, wherein each excavation depth is 50cm-100cm, the punched steel plate 3 is gradually exposed above an excavation surface while excavating, a hole is drilled on the side wall of a foundation pit through the holes on the exposed punched steel plate 3, a grouting pipe 6 is inserted into the hole, cement slurry is injected into the grouting pipe 6 by a cement slurry pressure pumping machine at a pressure greater than 0.2MPA, the cement slurry permeates into the soil layer of the side wall of the foundation pit under the pressure effect and is connected into a sheet to form a waterproof curtain 7, and the grouting pipe 6 and the internal cement slurry form a cement anchor rod structure between the punched steel plate 3 and the steel pipe 2;
after the cement slurry is initially set, C25 plain concrete is poured between the steel pipes 2, gaps between the steel pipes 2 and the punched steel plates 3 are completely filled, a wall body supporting wall with strength and rigidity sufficient for resisting the soil pressure of the side wall of the foundation pit is formed, and according to the mode, water-stop curtains 7 and concrete between the pipes are excavated downwards layer by layer.
Embodiment two:
When the excavation depth of the foundation pit is about 7-13 m, drilling holes at four corners of the foundation pit to construct bored piles 1, wherein the pile bottom elevation is 100cm below the design elevation of the foundation pit bottom, then excavating a groove between two adjacent bored piles 1, and hanging a pipe and plate combination part welded by a steel pipe 2 with the pipe diameter of 80cm and the pipe spacing of 30cm and a punched steel plate 3 with the longitudinal distance of 15cm into the groove;
Excavating foundation pit layer by layer, wherein the first excavation depth is 50cm, constructing an enclosing purlin 4, cladding the tops of the steel pipes 2 on the same side into a whole, connecting the whole with the bored pile 1 and the concrete between the pipes into a piece, reserving a steel bar head under the enclosing purlin 4 for waiting for the concrete between the connecting pipes, and embedding a waterproof board 8 on the enclosing purlin 4 for blocking water;
Then, a gusset 501 and a pair of braces 502 are applied to the enclosing purlin 4, and a horizontal support force transfer system is formed on the top surface of the foundation pit by using a concrete beam which forms a cross between the two gussets 501;
Continuously excavating downwards layer by layer, wherein each excavation depth is 50cm-100cm, the punched steel plate 3 is gradually exposed above an excavation surface while excavating, a hole is drilled on the side wall of a foundation pit through the holes on the exposed punched steel plate 3, a grouting pipe 6 is inserted into the hole, cement slurry is injected into the grouting pipe 6 by a cement slurry pressure pumping machine at a pressure greater than 0.2MPA, the cement slurry permeates into the soil layer of the side wall of the foundation pit under the pressure effect and is connected into a sheet to form a waterproof curtain 7, and the grouting pipe 6 and the internal cement slurry form a cement anchor rod structure between the punched steel plate 3 and the steel pipe 2;
After the cement slurry is initially set, C30 plain concrete is poured between the steel pipes 2, gaps between the steel pipes 2 and the punched steel plates 3 are completely filled, a wall body supporting wall with strength and rigidity sufficient for resisting the soil pressure of the side wall of the foundation pit is formed, and according to the mode, water-stop curtains 7 and concrete between the pipes are excavated downwards layer by layer.
Through the steps, the steel pipe 2, the punched steel plate 3 and concrete poured among the pipes form a reinforced concrete supporting structure of the side wall of the foundation pit, compared with the traditional stirring pile supporting structure, the concrete and mortar consumption is saved, meanwhile, the steel pipe provides larger rigidity, steel structural members in the scheme are used for supporting structures of reinforced concrete such as SMW construction method piles and the like, because the concrete is filled among the steel pipes instead of wrapping steel members, after the reinforced concrete is recovered, the concrete is stripped more easily, the punched steel plate 3 is inserted into the side wall of the foundation pit for pressure grouting to permeate to form a waterproof curtain 7 mortar layer with transverse connection with the supporting structure, the stability between the supporting structure and the side wall of the foundation pit is further improved while water seepage is avoided, and the problems that the existing deep and large foundation pit supporting structure is large in material consumption, the foundation pit is easy to infiltrate and steel in the reinforced concrete form is difficult to recover are solved.
Claims (7)
1. An integrated foundation pit supporting structure for building engineering construction comprises a bored pile (1); the method is characterized in that: the waterproof curtain also comprises a steel pipe (2), a punched steel plate (3), an enclosing purlin (4), a diagonal supporting structure and a waterproof curtain (7); the bored pile (1) is positioned at four corners of a foundation pit, the pile bottom is deep into 50cm-100cm below the design elevation of the pit bottom of the foundation pit, Q235B steel pipes (2) with the pipe diameter of 60-80cm are distributed along the side wall of the foundation pit at intervals of 30cm-50cm, punching steel plates (3) are longitudinally welded and fixed at equal intervals on two sides of the steel pipes (2) positioned on the same axis, the intervals between the adjacent punching steel plates (3) are 15cm-45cm, concrete is filled between the steel pipes (2), surrounding purlins (4) positioned on the top surface of the foundation pit are cast at the upper ends of the steel pipes (2) positioned on the same axis, four surrounding purlins (4) on the top surface of the foundation pit are integrally cast into an integral rectangular frame structure, the inner wall of the surrounding purlins (4) is cast into a diagonal support structure consisting of two mutually-intersected rectangular concrete frames, and a waterproof curtain (7) formed by pressure grouting is arranged on one side of the steel pipes (2) towards the side of the side wall of the foundation pit.
2. The construction integrated foundation pit supporting structure of claim 1, wherein: the depth of the foundation pit is 5m-7m, the pile bottom of the bored pile (1) is 50cm below the design elevation of the foundation pit bottom, the steel pipes (2) are Q235B steel pipes (2) with the pipe diameter of 60cm, the transverse distance between the outer walls of two adjacent steel pipes (2) is 50cm, the punching steel plates (3) with the longitudinal distance of 45cm are welded and fixed on two sides of the outer walls of the steel pipes (2) on the same axis, C25 concrete is poured and filled between the pipes, and the diameters of holes on the punching steel plates (3) are 8cm-10cm.
3. The construction integrated foundation pit supporting structure of claim 1, wherein: the depth of the foundation pit is 7m-13m, the pile bottom of the bored pile (1) is deeper than the design elevation of the foundation pit bottom by 100cm, the steel pipes (2) are Q235B steel pipes (2) with the pipe diameter of 80cm, the transverse distance between the outer walls of two adjacent steel pipes (2) is 30cm, the punching steel plates (3) with the longitudinal distance of 15cm are welded and fixed on two sides of the outer walls of the steel pipes (2) on the same axis, C30 concrete is poured and filled between the pipes, and the diameters of holes on the punching steel plates (3) are 8cm-10cm.
4. The construction integrated foundation pit supporting structure of claim 1, wherein: the height of the enclosing purlin (4) is 30cm-60cm, the end part of the enclosing purlin (4) is fixedly connected with the adjacent bored cast-in-place pile (1) in a pouring mode, and 8mm-14mm steel bars are arranged in the connecting point to form a tie, and the bottom of the enclosing purlin (4) is tied with the concrete between the pipes below the enclosing purlin through the 8mm-14mm steel bars.
5. The construction integrated foundation pit supporting structure of claim 1, wherein: the diagonal support structure comprises a gusset (501) and a pair of braces (502); the corner supports (501) are connected at the inflection points of two adjacent enclosing purlins (4) in a pouring mode, two mutually-intersected rectangular concrete frames are poured between the four corner supports (501) and form two crossed concrete slab-shaped structural counter supports (502) between the two adjacent corner supports (501).
6. The construction integrated foundation pit supporting structure of claim 1, wherein: the punching steel plate (3) is inserted with a grouting pipe (6) which penetrates through a soil layer of the side wall of the foundation pit by 60cm-80cm in a spacing hole, cement slurry is injected into the grouting pipe (6), and the cement slurry is penetrated in the soil layer of the side wall of the foundation pit in a crossing way to form a waterproof curtain (7).
7. The construction integrated foundation pit supporting structure of claim 1, wherein: enclose purlin (4) upper end and be close to pre-buried waterproof board (8) of foundation ditch lateral wall department, waterproof board (8) are thickness 1mm-2 mm's Q235B steel sheet, and waterproof board (8) top surface is in 50cm above the foundation ditch top surface design height, welded fastening between two adjacent waterproof board (8) tip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420552853.5U CN220847623U (en) | 2024-03-21 | 2024-03-21 | Integrated foundation pit supporting structure for building engineering construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420552853.5U CN220847623U (en) | 2024-03-21 | 2024-03-21 | Integrated foundation pit supporting structure for building engineering construction |
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