Foundation pit support structure for forming underground diaphragm wall based on H-shaped steel piles

Abstract

The utility model relates to the field of foundation pit support, in particular to a foundation pit support structure for forming an underground diaphragm wall based on H-shaped steel piles, which comprises the H-shaped steel piles, reinforcement cages, profiled steel sheets, additional tie bars and fine aggregate concrete, the H-shaped steel piles are arranged along the outer edge of a foundation pit, the reinforcement cages are arranged between every two adjacent H-shaped steel piles, and the profiled steel sheets are arranged on the outer edge of the foundation pit. The profiled steel sheets are fixed to wing plates, close to the inner side of the foundation pit, of every two adjacent H-shaped steel piles through bolts. The additional tie bar is arranged on a web of the H-shaped steel pile in a penetrating mode, and anchoring plates are arranged at the two ends of the additional tie bar and extend into the two reinforcement cages respectively. The fine aggregate concrete is poured among the H-shaped steel piles, the profiled steel sheets and the soil body outside the foundation pit, and an underground diaphragm wall is formed. The overall structure of the utility model adopts an enclosure structure which is supported by H-shaped steel piles, enclosed by underground diaphragm walls, reinforced by additional tie bars and formed by post-pouring concrete, so that the connection of all components of the enclosure structure is strengthened, and the bearing effect of the enclosure structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of foundation pit support, in particular to the foundation pit support structure based on H type steel pile formation underground continuous wall. BACKGROUND

[0002] Deep foundation pit support construction new technology research and application have become the major issue faced by the transformation development of the construction industry, the traditional underground continuous wall adopts wet operation "underwater concrete pouring" process and has many problems, such as process is difficult to operate, mud pollutes the environment, underwater construction blindness is bigger, concealed engineering is difficult to accept, underground continuous wall forming quality is poor, finally leads to the insufficient bearing capacity of support structure, affects construction safety, therefore, foundation pit support safety construction has become the key technical problem that urgently needs to be solved at present.

[0003] In order to solve the industry pain point problem in deep foundation pit support system, such as efficient construction, bearing safety problem in foundation pit support structure, the problem that the connection of support system is not firm leads to the excessive deformation or failure of support structure, the safety and economy problem of layered and segmented support structure hoisting construction, the bearing and water stop problem of support structure, the construction integration problem of support structure and main structure, the team of the side learns the technical premise of relevant scholars, and puts forward the present application. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing the foundation pit support structure based on H type steel pile formation underground continuous wall, to solve the industry pain point problem in deep foundation pit support system.

[0005] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: the foundation pit support structure based on H type steel pile formation underground continuous wall, including H type steel pile, steel reinforcement cage, profiled steel plate, additional reinforcement and fine stone concrete, the H type steel pile is arranged along the outer edge of foundation pit, is equipped with the steel reinforcement cage between two adjacent H type steel piles, the web of H type steel pile is equipped with additional reinforcement, and the both ends of additional reinforcement are equipped with anchor plate and respectively extend into two steel reinforcement cages, the flange plate close to the inner side of foundation pit of two adjacent H type steel piles is fixed with the profiled steel plate through bolt, and the H type steel pile, the profiled steel plate and the fine stone concrete between the outer soil body of foundation pit are poured and form underground continuous wall.

[0006] Preferably, the flange plate close to the inner side of foundation pit of the H type steel pile at the corner of foundation pit is also equipped with additional rib plate, the additional rib plate is integrally formed with the H type steel pile, the additional rib plate is perpendicular to the flange plate of H type steel pile, and the profiled steel plate at the corner of foundation pit is installed through bolt.

[0007] Preferably, the anchor rod is also punched on the underground continuous wall, one end of the anchor rod is punched into the soil layer outside the foundation pit, and the other end is anchored to the profiled steel plate.

[0008] Preferably, the length of the anchor rod is not less than 1500mm, and the diameter is not less than 25mm; each layer, each section, each module of the enclosure structure is provided with not less than 6 anchor rods, and the distance between two adjacent anchor rods is not more than 900mm, and the end anchor rod close to the H-shaped steel pile is not more than 300mm away from the H-shaped steel pile.

[0009] Preferably, the web of the H-shaped steel pile is provided with a plurality of reserved holes, the reserved holes are arranged along the web, the hole distance is 500mm, and the hole diameter is not less than 20mm; the reserved hole distance is 350mm within the range of 600mm above and below the layered part of the underground continuous wall; the wing plate close to the inner side of the foundation pit of the H-shaped steel pile is also provided with bolt holes, and the hole distance is not more than 450mm.

[0010] Preferably, the thickness of the profiled steel plate is not less than 5mm, the profiled steel plate is also provided with bolt holes, and the bolt holes are accurately aligned with the bolt holes of the profiled steel plate.

[0011] Preferably, the profiled steel plate is installed in layers, sections and modules along with the earth excavation, and the bottom of each section of the profiled steel plate is also provided with a grouting hole, and one grouting hole is arranged on each layering and module section for high-pressure supplementary grouting.

[0012] Preferably, the diameter of the additional reinforcement is not less than 20mm, and is 2mm-3mm smaller than the diameter of the reserved hole on the web of the H-shaped steel pile; the arrangement distance of the additional reinforcement is the same as the reserved hole distance on the web of the H-shaped steel pile, the additional reinforcement passes through the reserved hole, and the two ends of the additional reinforcement extend into the steel reinforcement cage on the left and right sides by not less than 600mm; the length of the additional reinforcement is not less than 1200mm, and the anchoring plate is arranged on the additional reinforcement at 100%.

[0013] Preferably, the distance between the two ends of the steel reinforcement cage and the web of the H-shaped steel pile is 20mm, the diameter of the steel reinforcement is not less than 10mm, and the distribution distance of the steel reinforcement is not more than 150mm; the steel reinforcement cage is installed in layers, sections and modules along with the earth excavation, and the steel reinforcement cages between the upper and lower layers are firmly supported by the close type reinforcement.

[0014] Preferably, after the earth excavation reaches each layering position, a water stop steel plate is arranged between the upper and lower underground continuous walls, the water stop steel plate is pressed into the lower soil body, and the upper part extends into the steel reinforcement cage.

[0015] Compared with the prior art, the utility model has the beneficial effects that: the overall structure adopts the enclosure structure of "H-shaped steel pile support, underground continuous wall enclosure, additional reinforcement strengthening, and post-poured concrete forming", so as to strengthen the connection of each component of the enclosure structure and improve the bearing effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a top view of the embodiment of the utility model. DETAILED DESCRIPTION

[0017] Please refer to Figure 1 , the utility model discloses a foundation pit support structure based on H type steel pile formation underground continuous wall, including H type steel pile 1, reinforcement cage 2, profiled steel sheet 33, additional reinforcement 44 and fine stone concrete.H type steel pile 1 is along the edge of foundation pit and is arranged, is equipped with reinforcement cage 2 between two adjacent H type steel piles 1, and the wing plate of two adjacent H type steel piles 2 close to the inside of foundation pit is fixed with profiled steel sheet 3 through bolt 5, and additional reinforcement 4 is arranged on the web of H type steel pile 1, and the both ends of additional reinforcement 4 are equipped with anchor plate 6, and the cavity after the overall structure installation pours fine stone concrete, to form underground continuous wall.

[0018] Specifically:

[0019] The design size of H type steel pile 1 should be considered according to the factors such as earth excavation depth, geological condition, underground water dynamic water pressure condition, etc., the web of H type steel pile 1 is equipped with reserved hole, the diameter of reserved hole is not less than 20mm, reserved hole is arranged along the web, and the hole distance is 500mm, and the reserved hole spacing is 350mm within the range of 600mm above and below underground continuous wall layered position, and the wing plate of H type steel pile 1 close to the inside of foundation pit is also equipped with bolt hole, and the bolt hole spacing is not more than 450mm.

[0020] Reinforcement cage 2 is arranged between adjacent H type steel piles 1, and reinforcement cage 2 is arranged with earth layering, segmentation, and the both ends are inserted into the inside of H type steel pile 1 and are 20mm away from the web, and reinforcement cage 2 is arranged with double layers and double directions, and the diameter of reinforcement is not less than 10mm, and the spacing of distribution reinforcement is not more than 150mm, and the reinforcement is layered and segmented, and is arranged in modules between adjacent two H type steel piles 1, and the upper and lower two layers of reinforcement cage 2 are supported firmly using close type reinforcement.

[0021] In order to realize that underground support structure does underground main structure wall, the thickness of profiled steel sheet 3 arranged between adjacent two H type steel piles 1 is not less than 5mm, and profiled steel sheet 3 is installed in place with earth excavation layering, segmentation and module, and is fixed on the wing plate of H type steel pile 1 using bolt 5.Profiled steel sheet 3 is one of important components of underground continuous wall construction, and also does permanent grouting formwork in construction process.Each section of profiled steel sheet 3 is also provided with a grouting hole.

[0022] The diameter of bolt 5 for fixing H type steel pile 1 and profiled steel sheet 3 is not less than 20mm, and the diameter of bolt 5 should be 2mm to 3mm smaller than the diameter of bolt hole on the wing plate of H type steel pile 1, and the bolt hole on H type steel pile 1 and the bolt hole on profiled steel sheet 3 should be accurately aligned, and the single-hole error is not more than 1mm, to ensure that accurate hole connection can be achieved during on-site construction.

[0023] In order to strengthen the joint connection strength between the H-shaped steel pile 1 and each sectional underground continuous wall, and improve the overall enclosure bearing capacity, the diameter of the additional reinforcing bar 4 passing through the web of the H-shaped steel pile 1 is not less than 20 mm, and is 2 mm to 3 mm smaller than the diameter of the reserved hole on the web of the H-shaped steel pile 1. The length of the additional reinforcing bar 4 is not less than 1200 mm, and the two ends of the additional reinforcing bar 4 after being perforated are each extended into the steel reinforcement cage 2 of the left and right underground continuous walls by not less than 600 mm. The spacing of the additional reinforcing bar 4 is the same as the spacing of the reserved hole on the web of the H-shaped steel pile 1. An anchor plate 6 is screwed at the end of each additional reinforcing bar 4, and the anchor plate 6 is arranged on 100% of the additional reinforcing bars 4.

[0024] After all the components are installed, fine stone concrete is poured in the cavity between the H-shaped steel pile 1, the profiled steel plate 3 and the soil outside the foundation pit. The fine stone concrete is micro-expanding and has a strength of not less than C30. In order to ensure the fine stone concrete pouring work between each layer and each module, and solve the water stop problem between the upper and lower underground continuous walls, after the earthwork is excavated to each layer position, a water stop steel plate is pressed into the lower soil, and the upper part of the water stop steel plate extends into the steel reinforcement cage 2. The concrete pouring adopts a "two-time grouting method", that is, after the fine stone concrete is poured for the first time, high-pressure supplementary grouting is performed from the grouting hole at the bottom of each sectional profiled steel plate 3 by 200 mm.

[0025] In order to further optimize the enclosure structure and reduce the consumption of materials, an additional rib plate 7 is arranged on the wing plate of the H-shaped steel pile 1 close to the inner side of the foundation pit at the corner of the foundation pit. The additional rib plate 7 is integrally formed with the H-shaped steel pile 1 in the factory, and bolt holes are also arranged on the additional rib plate 7, which are mainly used for the installation of the profiled steel plate 3 at the corner of the foundation pit. The size of the additional rib plate 7 and the reserved holes thereon are consistent with the design requirements of the wing plate of the H-shaped steel pile 1.

[0026] In order to further improve the bearing effect of the overall enclosure structure, anchor rods 8 are also arranged on each sectional underground continuous wall to reinforce the enclosure structure and the soil outside the foundation pit. One end of the anchor rod 8 is punched into the soil layer, and the other end is anchored on the profiled steel plate 3. The length of the anchor rod 8 is not less than 1500 mm, and the diameter is not less than 25 mm. There are not less than 6 anchor rods 8 on each layer, each section and each module of the enclosure structure. The spacing between adjacent anchor rods 8 is not more than 900 mm. The end of the anchor rod 8 close to the H-shaped steel pile 1 is not more than 300 mm away from the H-shaped steel pile 1. The spacing between the upper and lower anchor rods 8 should be appropriately increased.

[0027] In summary, the overall enclosure structure of the utility model adopts the "H-shaped steel pile support, underground continuous wall enclosure, additional reinforcing bar reinforcement, post-poured concrete forming and anchor rod strengthening" structure, so as to strengthen the connection of each component of the enclosure structure and improve the bearing effect thereof.

[0028] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A foundation pit enclosure structure based on H-shaped steel pile forming a diaphragm wall, characterized in that: The H-shaped steel pile, the reinforcement cage, the profiled steel plate, the additional reinforcement and the fine stone concrete are arranged along the outer edge of the foundation pit, the reinforcement cage is arranged between two adjacent H-shaped steel piles, the additional reinforcement is arranged on the web of the H-shaped steel pile, the two ends of the additional reinforcement are provided with anchor plates and extend into the two reinforcement cages respectively, the profiled steel plate is fixed on the wing plate near the inner side of the foundation pit of two adjacent H-shaped steel piles by bolts, the fine stone concrete is poured between the H-shaped steel pile, the profiled steel plate and the soil outside the foundation pit, and the underground continuous wall is formed.

2. The excavation enclosure according to claim 1, wherein: The additional rib plate is arranged on the wing plate of the H-shaped steel pile near the inner side of the foundation pit at the corner of the foundation pit, the additional rib plate is integrally formed with the H-shaped steel pile, the additional rib plate is perpendicular to the wing plate of the H-shaped steel pile, and the profiled steel plate at the corner of the foundation pit is installed by bolts.

3. The excavation enclosure according to claim 1, wherein: The anchor rod is further arranged on the underground continuous wall, one end of the anchor rod is punched into the soil layer outside the foundation pit, and the other end is anchored to the profiled steel plate.

4. A retaining structure according to claim 3, wherein: The length of the anchor rod is not less than 1500 mm, and the diameter is not less than 25 mm; the enclosure structure of each layer, each section and each module is provided with not less than six anchor rods, the spacing between two adjacent anchor rods is not more than 900 mm, and the end anchor rod near the H-shaped steel pile is away from the H-shaped steel pile by not more than 300 mm.

5. The excavation enclosure according to claim 1, wherein: A plurality of reserved holes are arranged on the web of the H-shaped steel pile, the reserved holes are arranged along the web, the hole spacing is 500 mm, and the hole diameter is not less than 20 mm; the reserved hole spacing is 350 mm within the range of 600 mm above and below the layered part of the underground continuous wall; the wing plate of the H-shaped steel pile near the inner side of the foundation pit is further provided with bolt holes, and the hole spacing is not more than 450 mm.

6. A retaining structure according to claim 5, wherein: The thickness of the profiled steel plate is not less than 5 mm, the profiled steel plate is also provided with bolt holes, and the bolt holes of the profiled steel plate are accurately aligned.

7. The excavation enclosure of claim 1, wherein: The profiled steel plate is installed in layers, sections and modules according to the earth excavation, the bottom of each section of the profiled steel plate is further provided with a grouting hole, one grouting hole is arranged on each layer and each module section, and the grouting hole is used for high-pressure supplementary grouting.

8. The excavation enclosure of claim 2, wherein: The diameter of the additional reinforcement is not less than 20 mm, and is smaller than the diameter of the reserved hole on the web of the H-shaped steel pile by 2 mm to 3 mm; the arrangement spacing of the additional reinforcement is the same as the spacing of the reserved hole on the web of the H-shaped steel pile, the additional reinforcement passes through the reserved hole, and the two ends of the additional reinforcement extend into the reinforcement cages on the left and right sides by not less than 600 mm; the length of the additional reinforcement is not less than 1200 mm, and the anchor plate is arranged on the additional reinforcement by 100%.

9. The excavation enclosure of claim 1, wherein: The distance between the two ends of the reinforcement cage and the web of the H-shaped steel pile is 20 mm, the diameter of the reinforcement is not less than 10 mm, and the spacing of the distributed reinforcement is not more than 150 mm; the reinforcement cage is installed in layers, sections and modules according to the earth excavation, and the reinforcement cages in the upper and lower layers are firmly supported by the close type reinforcement.

10. The excavation enclosure of claim 1, wherein: After the earth excavation reaches each layer position, the water stop steel plate is arranged between the underground continuous walls in the upper and lower layers, the water stop steel plate is pressed into the lower soil body, and the upper part extends into the reinforcement cage.

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