CN215406092U - Combination steel constructs foundation ditch retaining structure - Google Patents
Combination steel constructs foundation ditch retaining structure Download PDFInfo
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- CN215406092U CN215406092U CN202121357343.5U CN202121357343U CN215406092U CN 215406092 U CN215406092 U CN 215406092U CN 202121357343 U CN202121357343 U CN 202121357343U CN 215406092 U CN215406092 U CN 215406092U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 198
- 239000010959 steel Substances 0.000 title claims abstract description 198
- 239000002689 soil Substances 0.000 claims abstract description 84
- 239000004568 cement Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000003831 antifriction material Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 2
- 230000003588 decontaminative effect Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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Abstract
A combined steel structure foundation pit support structure comprises a waterproof curtain and supporting row piles, and a deep foundation pit closed type assembly support system which integrates soil retaining and water stopping and has high rigidity and high bearing capacity is formed jointly. The elements supporting the row piles are assembled at the construction site. Can retrieve the support campshed after the foundation ditch uses and accomplish, carry out reuse. The waterproof curtain is a triaxial cement soil mixing pile, the supporting row piles are constructed by a resonance-free vibration hammer through a vibration sinking method, and the construction site is environment-friendly and free of mud pollution. The utility model overcomes the defects of the prior pile arrangement or underground continuous wall foundation pit support structure and realizes the green development and the industrialized construction of deep foundation pit engineering.
Description
Technical Field
The utility model belongs to the field of foundation foundations, and particularly relates to a fabricated steel structure foundation pit support structure.
Background
At present, an enclosure structure in a supporting and retaining type deep foundation pit project mainly comprises a reinforced concrete pile wall, a steel sheet pile, an SMW construction method and the like. Because the deep foundation pit support is mainly deformation control, row piles or underground continuous walls with high rigidity and bearing capacity are mostly adopted as the enclosure structure of the foundation pit, and after the reinforced concrete pile wall type enclosure structure of the foundation pit is used in the foundation pit engineering, except that a few of the row piles or the underground continuous walls are used as a part of the underground structure, most of the row piles or the underground continuous walls are abandoned underground to become construction waste, so that resources are wasted, and the row piles or the underground continuous walls become obstacles in the subsequent underground space development, and great difficulty is brought to the development and utilization of the subsequent underground space.
Although the steel sheet pile and the SMW construction method foundation pit support structure are adopted, the steel sheet pile and the SMW construction method foundation pit support structure are recycled after the use function of the foundation pit engineering is completed, and can be repeatedly utilized, so that the waste of resources is obviously reduced. However, the steel sheet piles and the SMW construction method enclosure structure have low bending rigidity, so that the steel sheet piles and the SMW construction method enclosure structure cannot be used in deep foundation pit engineering with large foundation pit depth and strict deformation control, and the application range is limited.
Therefore, under the environment of green construction and sustainable development of civil engineering, the problem of how to realize green construction and industrialization of deep foundation pit engineering is always a problem explored by engineers in the field of foundation pit engineering.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a combined steel structure foundation pit support structure, which aims to solve the technical problems that the traditional concrete support structure is not environment-friendly in construction and serious in material waste, and also aims to solve the technical problems that the conventional section steel and steel sheet pile support structure is small in bending rigidity and low in bearing capacity and cannot effectively control support deformation.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a combined steel structure foundation pit support structure comprises a water-stop curtain and supporting row piles which are arranged in soil around a foundation pit, wherein the water-stop curtain is a triaxial cement soil pile water-stop curtain, the triaxial cement soil pile water-stop curtain is arranged around the periphery of the foundation pit to form a closed water-stop system, the triaxial cement soil pile water-stop curtain comprises a group of triaxial cement soil pile parallel units which are arranged in parallel with the side wall of the foundation pit and a group of triaxial cement soil pile vertical units which are arranged perpendicular to the side wall of the foundation pit,
the parallel units of the triaxial cement-soil pile are connected by repeated trepanning drilling of one pile position of adjacent units, the repeated trepanning drilling pile is a connecting pile, the number of the vertical units of the triaxial cement-soil pile is matched with the number of the connecting pile, the vertical unit of the triaxial cement-soil pile comprises three pile positions which are two lateral vertical piles and a central vertical pile respectively, wherein the central vertical pile is aligned with the center of the connecting pile and is connected by repeated trepanning drilling,
the supporting row piles comprise a group of bent frame type double-row pile units, the number of the bent frame type double-row pile units is matched with the number of the triaxial cement-soil pile vertical units, the bent frame type double-row pile units are also arranged perpendicular to the side wall of the foundation pit and comprise two steel pipe piles, a combined connecting steel plate and a cross central water stop steel plate, the combined connecting steel plate extending out of the inner side of each steel pipe pile is fixedly connected to the inner side of each steel pipe pile along the height direction of the steel pipe pile, the combined connecting steel plate is planar, and the plane penetrates through the longitudinal axis of the steel pipe pile,
the cross-shaped central water stop steel plate is arranged along the height direction of the steel pipe pile and comprises parallel wing plates arranged in parallel with the side wall of the foundation pit and vertical wing plates arranged perpendicular to the side wall of the foundation pit, the cross-shaped central water stop steel plate is positioned in the middle of the combined connecting steel plates at two sides, the steel pipe piles with the combined connecting steel plates at two sides are arranged at two sides of the vertical wing plates at equal intervals, the plane of the vertical wing plates is coplanar with the plane of the combined connecting steel plates,
the bent frame type double-row pile units are buried in the soil body along the positions of the three-axis cement soil pile vertical units.
The combined connection steel plate and the cross center water stop steel plate are embedded into the range of the vertical unit of the triaxial cement soil pile, the width of the vertical unit of the triaxial cement soil pile is not smaller than the clear distance between the front steel pipe pile and the rear steel pipe pile of the bent double-row pile unit, the steel pipe pile is meshed with the side vertical pile, the vertical central axis of the cross center water stop steel plate coincides with the central axis of the center vertical pile, the plane of the vertical wing plate is coplanar with the plane of the central line of the vertical unit of the triaxial cement soil pile, and the plane of the parallel wing plate is coplanar with the plane of the central line of the parallel unit of the triaxial cement soil pile.
The triaxial cement-soil pile parallel unit comprises three pile positions, namely two side parallel piles and a center parallel pile, and the side parallel piles of two adjacent triaxial cement-soil pile parallel units are connected by repeated trepanning drilling.
The combined connection steel plate comprises an extension arm steel plate and an inter-plate connection plate, the extension arm steel plate is arranged along the height direction of the steel pipe pile, the end face of the connection end of the extension arm steel plate is fixedly connected with a bus of the steel pipe pile, the cantilever end of the extension arm steel plate is fixedly connected with one end of the inter-plate connection plate, and the other end of the inter-plate connection plate is fixedly connected with the end of the vertical wing plate.
The inter-plate connecting plates are a group of horizontal strips which are arranged in a grid shape along the height direction of the steel pipe pile at intervals, the horizontal strips are connected with the outrigger steel plates through bolts, and the number of the connecting bolts of each horizontal strip and the outrigger steel plate is not less than two.
The cantilever steel plate is connected with the steel pipe pile through fillet welding, and the inter-plate connecting plate is connected with the vertical wing plate through three-side girth welding.
The outer diameter of the steel pipe pile is not smaller than 600mm, the wall thickness of the steel pipe pile is not smaller than 8mm, the two steel pipe piles of each bent frame type double-row pile unit are divided into a front row of steel pipe piles and a rear row of steel pipe piles according to the distance from the edge of a foundation pit, and the central shaft distance between the front row of steel pipe piles and the rear row of steel pipe piles is 2.5-4 times of the pile diameter.
The width of the parallel wing plate and the width of the vertical wing plate of the cross-shaped central water stop steel plate are 150-200 mm, the thickness of the parallel wing plate and the thickness of the vertical wing plate are 10-15 mm, the width of the arm extending steel plate is 150-200 mm, the thickness of the arm extending steel plate is 10-15 mm, the width of the horizontal slat is 150-200 mm, the thickness of the horizontal slat is 10-15 mm, and the distance between the horizontal center lines of the two adjacent horizontal slats is 1.5-2.5 m.
The lowest point of the bottom end of the extension arm steel plate does not exceed the bottom end of the steel pipe pile downwards, the bottom end of the extension arm steel plate is provided with a bevel angle, and the bottom end of the cross-shaped central water stop steel plate is flush with the bottom end of the vertical unit of the triaxial cement soil pile in the soil body.
Compared with the prior art, the utility model has the following characteristics and beneficial effects:
the utility model combines a new waterproof curtain form with the support row piles to form an enclosure structure which can not only retain soil but also stop water, and is a closed enclosure system which integrates the functions of retaining soil and stopping water.
In the enclosure system, water and soil pressure is borne by the support row piles, and because the support row piles are steel pipe piles with larger diameters and form a multi-layer row frame type structure through the horizontal connecting steel plates, compared with the conventional double-row piles, the stress state of the enclosure structure under the action of the water and soil pressure is obviously improved, and the bearing capacity is greatly improved. Meanwhile, the lateral stiffness of the structure is also obviously improved, the structure is a large-stiffness foundation pit support structure, deformation control of a foundation pit support system is facilitated, the surrounding environment is protected, the number of the inner supports and the number of the anchor cables can be reduced under the same deformation control condition, the construction process and the construction period are shortened, and the economic benefit is obvious.
Meanwhile, the central cross-shaped steel plate is additionally arranged in the support row piles, so that the water stopping effect of the enclosure system is obviously improved. And the supporting row piles are vibrated by the resonance-free vibration hammer to sink into the stratum, grooving in advance is not needed, no wall protection slurry pollutes the environment, and the construction site is civilized and environment-friendly. The waterproof curtain is positioned in the range of the support row piles, so that the occupied area of the enclosure system is reduced, the space of the enclosure structure is saved, and conditions are created for improving the use space of the underground structure. The connecting positions of different components in the supporting row piles are all located in the cement soil piles, so that the difficulty of vibration-sinking construction of the multilayer row-frame type double-row piles in the stratum is remarkably reduced.
After the foundation pit is used, the supporting row piles can be pulled out through vibration, all components of the supporting row piles are recycled and repeatedly utilized, energy and materials are saved, and the foundation pit is low-carbon and environment-friendly.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic plan view of the structure of the present invention.
Fig. 2 is a schematic structural view of a bent double row pile unit of the present invention.
Fig. 3 is a schematic plane structure view of a triaxial cement-soil pile parallel unit according to the present invention.
Fig. 4 is a schematic plan view showing the structure of the vertical unit of the triaxial soil-cement pile according to the present invention.
Fig. 5 is a schematic structural plan view of the triaxial cement-soil pile waterproof curtain of the present invention.
FIG. 6 is a schematic diagram showing the completion of step a in step four of the construction method of the present invention.
FIG. 7 is a schematic view showing the completion of step b in step four of the construction method of the present invention.
FIG. 8 is a schematic diagram showing the completion of step c in step four of the construction method of the present invention.
FIG. 9 is a schematic diagram of the completion of step six in the construction method of the present invention.
Reference numerals: the method comprises the following steps of 1-soil body, 2-supporting row piles, 21-steel pipe piles, 22-combined connecting steel plates, 221-cantilever steel plates, 222-inter-plate connecting plates, 23-cross central water stop steel plates, 231-parallel wing plates, 232-vertical wing plates, 24-bolts, 3-water stop curtains, 31-triaxial cement soil pile parallel units, 311-side parallel piles, 312-central parallel piles, 32-triaxial cement soil pile vertical units, 321-side vertical piles, 322-central vertical piles and 33-connecting piles.
Detailed Description
Embodiment referring to fig. 1-5, a composite steel foundation pit enclosure structure comprises a waterproof curtain 3 and supporting row piles 2, wherein the waterproof curtain 3 is a triaxial cement soil pile waterproof curtain, the triaxial cement soil pile waterproof curtain is arranged around the periphery of a foundation pit to form a closed waterproof system, and the triaxial cement soil pile waterproof curtain comprises a group of triaxial cement soil pile parallel units 31 arranged in parallel with the side wall of the foundation pit, as shown in fig. 3 and 5; as shown in fig. 4 and 5, the three-axis vertical cement-soil pile unit 32 is arranged perpendicular to the side wall of the foundation pit.
Referring to fig. 5, the three-axis soil-cement pile parallel units 31 are connected by repeated trepanning of a pile position of adjacent units, the repeated trepanning pile is a connecting pile 33, the number of the three-axis soil-cement pile vertical units 32 is adapted to the number of the connecting piles 33, the three-axis soil-cement pile vertical unit 32 comprises three pile positions, namely two side vertical piles 321 and a central vertical pile 322, wherein the central vertical pile 322 is aligned with the center of the connecting pile 33 and is connected by repeated trepanning. The triaxial cement-soil pile parallel unit 31 comprises three pile positions, namely two side parallel piles 311 and a center parallel pile 312, and the side parallel piles 311 of two adjacent triaxial cement-soil pile parallel units 31 are connected in a repeated drilling manner.
Referring to fig. 2, the supporting row pile 2 includes a set of bent frame type double-row pile units, the number of the bent frame type double-row pile units is adapted to the number of the triaxial cement-soil pile vertical units 32, the bent frame type double-row pile units are also perpendicular to the side wall of the foundation pit and include two steel pipe piles 21, a combined connection steel plate 22 and a cross center water stop steel plate 23, the combined connection steel plate 22 extending out of the inner side of each steel pipe pile 21 is fixedly connected to the inner side of each steel pipe pile 21 in the height direction of the steel pipe pile 21, the combined connection steel plate 22 is planar, and the plane penetrates through the longitudinal axis of the steel pipe pile 21.
The cross-shaped central water stop steel plate 23 is arranged along the height direction of the steel pipe pile 21 and comprises a parallel wing plate 231 arranged parallel to the side wall of the foundation pit and a vertical wing plate 232 arranged vertical to the side wall of the foundation pit, the cross-shaped central water stop steel plate 23 is positioned in the middle of the combined connection steel plates 22 on the two sides, the steel pipe piles 21 with the combined connection steel plates 22 on the two sides are arranged on the two sides of the vertical wing plate 232 at equal intervals, and the plane where the vertical wing plate 232 is located is coplanar with the plane where the combined connection steel plates 22 are located.
Referring to fig. 1, the bent frame type double-row pile unit is embedded in the soil along the position of the triaxial cement-soil pile vertical unit 32, the combined connecting steel plate 22 and the character center positioning steel plate 23 are embedded in the range of the triaxial cement-soil pile vertical unit 32, the width of the triaxial cement-soil pile vertical unit 32 is not less than the clear distance between the front steel pipe pile 21 and the rear steel pipe pile 21 of the bent frame type double-row pile unit, the steel pipe piles 21 are meshed with the edge side vertical piles 321, the vertical central axis of the cross center water stop steel plate 23 coincides with the central axis of the center vertical pile 322, the plane of the vertical wing plate 232 is coplanar with the plane of the central line of the triaxial cement-soil pile vertical unit 32, and the plane of the parallel wing plate 231 is coplanar with the plane of the central line of the triaxial cement-soil pile parallel unit 31.
Referring to fig. 2, the combined connection steel plate 22 includes a cantilever steel plate 221 and an inter-plate connection plate 222, the cantilever steel plate 221 is disposed along the height direction of the steel pipe pile 21, the connection end face of the cantilever steel plate 221 is fixedly connected to a bus of the steel pipe pile 21, the cantilever end of the cantilever steel plate 221 is fixedly connected to one end of the inter-plate connection plate 222, and the other end of the inter-plate connection plate 222 is fixedly connected to the end of the vertical wing plate. The inter-plate connecting plates 222 are a group of horizontal strips arranged in a grid shape at intervals along the height direction of the steel pipe pile 21, the horizontal strips are connected with the outrigger steel plates 221 through bolts 24, and the number of the connecting bolts of each horizontal strip and the outrigger steel plates 221 is not less than two. The lowest point of the bottom end of the outrigger steel plate 221 does not exceed the bottom end of the steel pipe pile 21 downwards, the bottom end of the outrigger steel plate 221 is provided with a chamfer angle 25, and the bottom end of the cross-shaped central water stop steel plate 23 is flush with the bottom end of the triaxial cement-soil pile vertical unit 32 in the soil body.
In this embodiment, the outrigger steel plate 221 and the steel pipe pile 21 are connected by fillet welding, and the inter-plate connection plate 222 and the vertical wing plate 232 are connected by triple fillet welding.
The outer diameter of the steel pipe pile 21 is not smaller than 600mm, the wall thickness of the steel pipe pile 21 is not smaller than 8mm, the two steel pipe piles 21 of each bent frame type double-row pile unit are divided into a front row of steel pipe piles 211 and a rear row of steel pipe piles 212 according to the distance from the edge of a foundation pit, and the central shaft distance of the front row of steel pipe piles and the rear row of steel pipe piles is 2.5-4 times of the pile diameter.
The width of the parallel wing plate 231 and the vertical wing plate 232 of the cross-shaped central water stop steel plate is 150 mm-200 mm, the thickness of the parallel wing plate is 10 mm-15 mm, the width of the cantilever steel plate 221 is 150 mm-200 mm, the thickness of the cantilever steel plate is 10 mm-15 mm, the width of the horizontal lath is 150 mm-200 mm, the thickness of the horizontal lath is 10 mm-15 mm, and the distance between the horizontal central lines of the two adjacent upper and lower horizontal laths is 1.5 m-2.5 m.
Referring to fig. 2, in this embodiment, the boom steel plate may be divided into a front boom steel plate and a rear boom steel plate according to the front and rear positions of the bent frame type double-row pile unit, and the inter-plate connecting plate is divided into a front connecting steel plate and a rear horizontal connecting steel plate; the front row of the extending arm steel plates are welded with the front row of the steel pipe piles, and the rear row of the extending arm steel plates are welded with the rear row of the steel pipe piles; the front end of the front connecting steel plate is connected with the front row extending arm steel plate through bolts, and the rear end of the front connecting steel plate is connected with the central cross-shaped steel plate in a welding mode; the front end of the rear connecting steel plate is welded with the central cross-shaped steel plate, and the rear end of the rear connecting steel plate is connected with the rear row extension arm steel plate through bolts.
The construction method of the combined steel structure foundation pit support structure comprises the following construction steps:
step one, calculating the size of each component of each bent frame type double-row pile unit through design according to hydrogeological conditions of a construction site, excavation depth of a foundation pit, surrounding environment and site conditions, prefabricating and processing each component in a factory, and transporting each component to a construction site for assembly to form a bent frame type double-row pile unit whole; the size of the welding leg during welding needs to meet the requirements of construction and stress.
And step two, measuring and setting out along the soil body 1 around the foundation pit, and marking the positions of the waterproof curtain and the support row piles.
And step three, carrying out rust removal and decontamination treatment on the support row piles, and after carrying out rust removal and decontamination treatment on steel, brushing an antifriction agent on the surface of a part, buried in the waterproof curtain, of the support row piles, wherein the thickness of the antifriction agent is 2 mm.
Step four, constructing a first construction cycle, and completing the three-axis cement-soil pile parallel unit 31 and the three-axis cement-soil pile vertical unit 32 by matching two three-axis mixing pile machines: the cement-soil mixing pile constructed by the triaxial mixing pile machine is mainly used for sealing water, and the cement mixing amount, the diameter and the lap joint length of the mixing pile during construction need to meet the requirement of sealing water of a foundation pit;
referring to fig. 6, in step a, a first triaxial mixing pile machine firstly constructs a first triaxial cement-soil pile parallel unit 31, and when constructing a cement-soil mixing pile, the first triaxial mixing pile machine constructs cement-soil pile parallel units successively and continuously from one side to the other side;
referring to fig. 7, step b, constructing adjacent triaxial cement-soil pile parallel units 31, wherein the drilling of the connecting piles 33 is repeated;
referring to fig. 8, in step c, the triaxial cement-soil pile vertical unit 32, the central vertical pile 322 and the connecting pile 33 of the second triaxial mixing pile machine are repeatedly drilled; the depth of the triaxial cement-soil mixing pile is consistent with the depth of the bottom end of a cross-shaped central water stop steel plate for supporting the row piles, the lapping length of a pile body needs to meet the requirement that the pile body does not split under the set verticality, and the diameter of the pile body needs to ensure that the width of the triaxial cement-soil pile vertical unit 32 is not less than the clear distance between front and rear row piles in the bent double-row pile unit; after the triaxial cement soil pile vertical unit 32 is constructed, the pile foundation for vibration sinking construction is in place in time, the level of a pile machine chassis and the verticality of the upright post guide frame are kept, and the verticality deviation of the pile frame is adjusted to be smaller than 1/250.
Step five, hoisting and positioning a bent frame type double-row pile unit: during positioning, the bent frame type double-row pile units are required to be integrally vertical, and the central line of the cross-shaped central water stop steel plate 23 coincides with the central line of the triaxial cement-soil pile vertical unit 32.
Referring to fig. 9, in step six, before the cement soil of the vertical unit 32 of the triaxial cement soil pile is initially set, the vertical unit 32 of the triaxial cement soil pile is vibrated and sunk into the ground layer by the resonance-free vibration hammer; in the vibration sinking process, the front row of steel pipe piles 211 and the rear row of steel pipe piles 212 need to be kept sinking synchronously; and stopping the vibration sinking when the vibration sinking reaches the set elevation, and moving to the next pile position.
And step seven, repeating the step four, the step five and the step six, and entering the next construction cycle until all the waterproof curtains and the supporting row piles are constructed.
And step eight, completing foundation pit excavation, adopting a vibration and sinking method to pull out the supporting row piles after the underground structure is constructed out of the ground, and timely grouting and backfilling after pulling out.
Claims (9)
1. The utility model provides a combination steel constructs foundation ditch retaining structure which characterized in that: the waterproof curtain comprises a waterproof curtain (3) and supporting row piles (2) which are arranged in a soil body (1) around a foundation pit, wherein the waterproof curtain (3) is a triaxial cement soil pile waterproof curtain, the triaxial cement soil pile waterproof curtain is arranged around the periphery of the foundation pit to form a closed waterproof system, the triaxial cement soil pile waterproof curtain comprises a group of triaxial cement soil pile parallel units (31) which are arranged in parallel with the side wall of the foundation pit and a group of triaxial cement soil pile vertical units (32) which are arranged in vertical with the side wall of the foundation pit,
the connection is realized through the repeated trepanning of a pile position of adjacent unit between triaxial cement soil pile parallel unit (31), and the stake is bored for connecting pile (33) to repeated trepanning, the number of the perpendicular unit of triaxial cement soil pile (32) suits with the number of connecting pile (33), and the perpendicular unit of triaxial cement soil pile (32) includes three pile positions, is two avris vertical pile (321) and a central vertical pile (322) respectively, wherein central vertical pile (322) is aligned with connecting pile (33) center and is realized being connected through repeated trepanning,
the supporting row piles (2) comprise a group of bent frame type double-row pile units, the number of the bent frame type double-row pile units is matched with the number of the triaxial cement soil pile vertical units (32), the bent frame type double-row pile units are also arranged perpendicular to the side wall of the foundation pit and comprise two steel pipe piles (21), a combined connecting steel plate (22) and a cross center water stop steel plate (23), the combined connecting steel plate (22) extending out of the inner side of each steel pipe pile (21) is fixedly connected with the inner side of each steel pipe pile (21) along the height direction of the steel pipe pile (21), the combined connecting steel plate (22) is planar, and the plane penetrates through the longitudinal axis of each steel pipe pile (21),
the cross-shaped central water stop steel plate (23) is arranged along the height direction of the steel pipe pile (21) and comprises a parallel wing plate (231) arranged in parallel with the side wall of the foundation pit and a vertical wing plate (232) arranged perpendicular to the side wall of the foundation pit, the cross-shaped central water stop steel plate (23) is positioned in the middle of the combined connecting steel plates (22) at two sides, the steel pipe piles (21) with the combined connecting steel plates (22) at two sides are arranged at two sides of the vertical wing plate (232) at equal intervals, the plane where the vertical wing plate (232) is positioned is coplanar with the plane where the combined connecting steel plates (22) are positioned,
the bent frame type double-row pile units are buried in the soil body along the position of the triaxial cement soil pile vertical unit (32).
2. The built-up steel structure foundation pit support structure of claim 1, characterized in that: the combined connection steel plate (22) and the cross center water stop steel plate (23) are embedded into the range of a triaxial cement soil pile vertical unit (32), the width of the triaxial cement soil pile vertical unit (32) is not smaller than the clear distance between the front steel pipe pile (21) and the rear steel pipe pile (21) of a framed-bent double-row pile unit, the steel pipe piles (21) are meshed with the side vertical piles (321) and connected, the vertical central axis of the cross center water stop steel plate (23) coincides with the central axis of the center vertical pile (322), the plane where the vertical wing plate (232) is located is coplanar with the plane where the central line of the triaxial cement soil pile vertical unit (32) is located, and the plane where the parallel wing plate (231) is located is coplanar with the plane where the central line of the triaxial cement soil pile parallel unit (31) is located.
3. The built-up steel structure foundation pit support structure of claim 1, characterized in that: triaxial soil cement pile parallel unit (31) includes three stake position, is two avris parallel pile (311) and a central parallel pile (312) respectively, and the avris parallel pile (311) of two adjacent triaxial soil cement pile parallel unit (31) carry out repeated trepanning and bore the connection.
4. The built-up steel structure foundation pit support structure of claim 2, characterized in that: the combined connecting steel plate (22) comprises an outrigger steel plate (221) and an inter-plate connecting plate (222), the outrigger steel plate (221) is arranged along the height direction of the steel pipe pile (21), the end face of the connecting end of the outrigger steel plate (221) is fixedly connected with a bus of the steel pipe pile (21), the cantilever end of the outrigger steel plate (221) is fixedly connected with one end of the inter-plate connecting plate (222), and the other end of the inter-plate connecting plate (222) is fixedly connected with the end of the vertical wing plate.
5. The built-up steel structure foundation pit support structure of claim 4, characterized in that: the inter-plate connecting plates (222) are a group of horizontal strips which are arranged in a grid shape at intervals along the height direction of the steel pipe pile (21), the horizontal strips are connected with the outrigger steel plates (221) through bolts (24), and the number of the connecting bolts of each horizontal strip and the outrigger steel plates (221) is not less than two.
6. The built-up steel structure foundation pit support structure of claim 4, characterized in that: the cantilever steel plate (221) is connected with the steel pipe pile (21) through fillet welding, and the inter-plate connecting plate (222) is connected with the vertical wing plate (232) through three-side girth welding.
7. The built-up steel structure foundation pit support structure of any one of claims 1-6, characterized in that: the outer diameter of the steel pipe piles (21) is not smaller than 600mm, the wall thickness of the steel pipe piles (21) is not smaller than 8mm, two steel pipe piles (21) of each bent frame type double-row pile unit are divided into a front row of steel pipe piles (211) and a rear row of steel pipe piles (212) according to the distance from the edge of a foundation pit, and the central shaft distance of the front row of steel pipe piles and the rear row of steel pipe piles is 2.5-4 times of the pile diameter.
8. The built-up steel structure foundation pit envelope of claim 5, characterized in that: the width of the parallel wing plate (231) and the width of the vertical wing plate (232) of the cross-shaped central water stop steel plate are 150-200 mm, the thickness of the cross-shaped central water stop steel plate is 10-15 mm, the width of the cantilever steel plate (221) is 150-200 mm, the thickness of the cantilever steel plate is 10-15 mm, the width of the horizontal slat is 150-200 mm, the thickness of the horizontal slat is 10-15 mm, and the distance between the horizontal center lines of the two adjacent upper and lower horizontal slats is 1.5-2.5 m.
9. The built-up steel structure foundation pit support structure of any one of claims 4-6, characterized in that: the lowest point of the bottom end of the cantilever steel plate (221) does not exceed the bottom end of the steel pipe pile (21) downwards, the bottom end of the cantilever steel plate (221) is provided with a chamfer angle (25), and the bottom end of the cross-shaped central water stop steel plate (23) is flush with the bottom end of the triaxial cement-soil pile vertical unit (32) in a soil body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121357343.5U CN215406092U (en) | 2021-06-18 | 2021-06-18 | Combination steel constructs foundation ditch retaining structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121357343.5U CN215406092U (en) | 2021-06-18 | 2021-06-18 | Combination steel constructs foundation ditch retaining structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114016514A (en) * | 2021-06-18 | 2022-02-08 | 中国建筑第二工程局有限公司 | Fabricated foundation pit support structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114016514A (en) * | 2021-06-18 | 2022-02-08 | 中国建筑第二工程局有限公司 | Fabricated foundation pit support structure and construction method thereof |
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