H-shaped steel and Larsen steel sheet pile combined deep foundation pit supporting construction method

Abstract

The invention discloses an H-shaped steel and Larsen steel sheet pile combined deep foundation pit support construction method, which comprises a support water stop device, the support water stop device comprises H-shaped steel and Larsen steel sheet piles, and the deep foundation pit support construction method comprises the following steps: (1) carrying out driving operation on a plurality of H-shaped steel; (2) a Larsen steel sheet pile is inserted between the two pieces of H-shaped steel; (3) after construction of the H-shaped steel and the Larsen steel sheet piles is completed, an enclosing purlin on the upper portion of the foundation pit is constructed; and (4) a steel pipe is adopted as a support in a middle support system in the foundation pit. The structure is convenient, the construction cost is saved, the construction period is shortened, operation is convenient and fast, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of building foundation pit support construction, and more specifically to a deep foundation pit support construction method combining H-shaped steel and Larsen steel sheet piles. Background Art

[0002] In the construction field, foundation pit refers to the space below the ground excavated for the construction of the foundation and basement of a building (including structures). It is usually a pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. The excavation depth of a deep foundation pit exceeds 5 meters.

[0003] Deep foundation pits require support construction because the excavation depth of deep foundation pits is large, which destroys the original balance of the soil. Under the action of soil pressure, water pressure, etc., the slope soil is prone to lose stability and collapse. The support structure can provide sufficient lateral resistance, restrain the deformation of the slope soil, prevent the occurrence of collapse accidents, and ensure the safety of construction personnel and equipment. At the same time, avoid the base uplift. Excavation unloading will cause the soil at the bottom of the foundation pit to rebound upward. When the foundation pit is deep and the soil quality is poor, the base uplift may occur. The support structure can play a certain restraining role on the base soil, reduce the possibility of base uplift, and avoid affecting the construction in the foundation pit.

[0004] In coastal areas, the geological conditions such as deep silt and miscellaneous fill are poor. In the construction of high-speed wire production line projects, slag flushing ditches will be involved. The depth of the slag flushing ditches is relatively deep. Deep foundation pit operations will bring many unfavorable safety factors, causing the foundation pit to become unstable and the buildings around the foundation pit to deform. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a deep foundation pit support construction method combining H-shaped steel + Larsen steel sheet piles to avoid the safety hazards caused by constructing deep foundation pits on silty soil.

[0006] The present invention adopts the following technical solution:

[0007] A deep foundation pit support construction method using an H-shaped steel + Larsen steel sheet pile combination includes a support water-stopping device, the support water-stopping device includes an H-shaped steel and a Larsen steel sheet pile, and the deep foundation pit support construction method includes the following steps:

[0008] (1) Perform injection molding operations on multiple H-beams;

[0009] (2) Insert Larsen steel sheet piles between two H-shaped steels;

[0010] (3) After the H-shaped steel and Larsen steel sheet piles are completed, the upper purlin of the foundation pit is constructed;

[0011] (4) Steel pipes are used as supports in the intermediate support system inside the foundation pit.

[0012] Furthermore, the size of the H-shaped steel is 488*300*11*18 mm, and the interval between two adjacent H-shaped steels is 600 mm.

[0013] Furthermore, the model of the Larsen steel sheet pile is Type IV Larsen steel sheet pile, the size is 400*170*15.5mm, and the interval between two adjacent Larsen steel sheet piles is 600mm.

[0014] Furthermore, the purlin is a 700*1300mm reinforced concrete beam, and the H-shaped steel is wrapped in the reinforced concrete beam.

[0015] Further, the purlin includes purlin one, purlin two, purlin three, purlin four, purlin five, purlin six, purlin seven, purlin eight and purlin nine, purlin two and purlin three are parallel, purlin one connects purlin two and one end of purlin three, purlin four, purlin five and purlin six are connected in sequence, purlin four is connected to one end of purlin two, purlin six is ​​connected to one end of purlin three, purlin seven, purlin eight and purlin nine are connected in sequence, purlin seven is connected to purlin six and purlin three, and purlin nine is connected to purlin three.

[0016] Furthermore, the second purlin is parallel to the third purlin, an even number of steel pipes 1 are arranged between the second purlin and the third purlin, and every two steel pipes 1 are grouped together, and the middle of each group of steel pipes 1 is connected by steel pipe 2.

[0017] Furthermore, steel pipe three is installed between the first purlin, the second purlin and the third purlin, and the steel pipe three is inclined.

[0018] Furthermore, the seventh purlin is parallel to the ninth purlin, and a plurality of parallel steel pipes four are installed between the seventh purlin and the ninth purlin, and the steel pipes four are parallel to the eighth purlin.

[0019] Furthermore, the first purlin is perpendicular to the second purlin, the H-shaped steel at the connection between the first purlin and the second purlin is arranged horizontally or vertically, and the horizontally arranged H-shaped steel and the vertically arranged H-shaped steel are connected by inclined Larsen steel sheet piles.

[0020] Beneficial Effects

[0021] The present invention is safer, more convenient and faster during construction. Compared with the traditional deep foundation pit solidification process, it greatly saves labor costs, reduces safety risks and speeds up the construction progress. The overall H-shaped steel + Larsen steel sheet pile combined support structure is convenient to construct, saves construction costs and construction period, is easy and quick to operate, and greatly increases work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] As shown in the figure, the present invention discloses a deep foundation pit support construction method of H-shaped steel + Larsen steel sheet pile combination, including a support water-stopping device, the support water-stopping device includes an H-shaped steel 1 and a Larsen steel sheet pile 2, and the deep foundation pit support construction method includes the following steps:

[0026] (1) Performing injection molding operations on a plurality of H-shaped steels 1;

[0027] (2) Insert the Larsen steel sheet pile 2 between the two H-shaped steels 1;

[0028] (3) After the H-shaped steel 1 and Larsen steel sheet pile 2 are completed, the upper purlin of the foundation pit is constructed;

[0029] (4) Steel pipes are used as supports in the intermediate support system inside the foundation pit.

[0030] The present invention innovatively uses a combined support method of H-shaped steel + Larsen steel sheet piles to achieve support, which utilizes the water-stopping property of the Larsen steel sheet piles and the strength of the H-shaped steel. The entire support structure is easy to construct, construction costs and construction period are saved, the operation is convenient and quick, and work efficiency is greatly increased.

[0031] In one embodiment of the present invention, the size of the H-shaped steel is 488*300*11*18 mm, and the interval between two adjacent H-shaped steels is 600 mm.

[0032] In one embodiment of the present invention, the Larsen steel sheet pile model is Type IV Larsen steel sheet pile, the size is 400*170*15.5mm, and the interval between two adjacent Larsen steel sheet piles is 600mm.

[0033] In one embodiment of the present invention, the surrounding purlin is a 700*1300mm reinforced concrete beam, and the H-shaped steel 1 is wrapped in the reinforced concrete beam, which improves the stability of the overall support.

[0034] In one embodiment of the present invention, the purlin includes purlin one 3, purlin two 4, purlin three 5, purlin four 6, purlin five 7, purlin six 8, purlin seven 9, purlin eight 10 and purlin nine 11. Purlin two 4 and purlin three 5 are parallel. Purlin one 3 connects purlin two 4 and one end of purlin three 5. Purlin four 6, purlin five 7 and purlin six 8 are connected in sequence. Purlin four 6 is connected to one end of purlin two 4. Purlin six 8 is connected to one end of purlin three 5. Purlin seven 9, purlin eight 10 and purlin nine 11 are connected in sequence. Purlin seven 9 is connected to purlin six 8 and purlin three 5. Purlin nine 11 is connected to purlin three 5. The surrounding purlin structure of the present invention realizes the supporting and water-stopping functions.

[0035] In one embodiment of the present invention, the second purlin 4 and the third purlin 5 are parallel, and an even number of steel pipes 12 are arranged between the second purlin 4 and the third purlin 5, and every two steel pipes 12 are grouped together, and the middle of each group of steel pipes 12 is connected by a second steel pipe 13. The design of the steel pipe 12 ensures the structural stability of the second purlin 4 and the third purlin 5.

[0036] In one embodiment of the present invention, a steel pipe 3 14 is installed between the first purlin 3 and the second purlin 4 and the third purlin 5, and the steel pipe 3 14 is tilted. The steel pipe 3 14 ensures the structural stability of the first purlin 3, the second purlin 4, and the third purlin 5.

[0037] In one embodiment of the present invention, the seventh purlin 9 and the ninth purlin 11 are parallel, and a plurality of parallel steel pipes 15 are installed between the seventh purlin 9 and the ninth purlin 11, and the steel pipes 15 are parallel to the eighth purlin 10. The steel pipes 15 ensure the structural stability of the seventh purlin 9 and the ninth purlin 11.

[0038] In one embodiment of the present invention, the first purlin 3 is perpendicular to the second purlin 4, the H-shaped steel 1 at the connection between the first purlin 3 and the second purlin 4 is horizontally or vertically arranged, and the horizontally arranged H-shaped steel 1 and the vertically arranged H-shaped steel 1 are connected by an inclined Larsen steel sheet pile 2.

[0039] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deep foundation pit support construction method using H-shaped steel + Larsen steel sheet piles, characterized in that: Including a support water-stopping device, the support water-stopping device includes H-shaped steel and Larsen steel sheet piles, and the deep foundation pit support construction method includes the following steps: (1) Perform injection molding operations on multiple H-beams; (2) Insert Larsen steel sheet piles between two H-shaped steels; (3) After the H-shaped steel and Larsen steel sheet piles are completed, the upper purlin of the foundation pit is constructed; (4) Steel pipes are used as supports in the intermediate support system inside the foundation pit.

2. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 1 is characterized by: The size of H-beam is 488*300*11*18mm, and the interval between two adjacent H-beams is 600mm.

3. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 2 is characterized by: The model of Larsen steel sheet pile is Type IV Larsen steel sheet pile, the size is 400*170*15.5mm, and the interval between two adjacent Larsen steel sheet piles is 600mm.

4. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 1 is characterized by: The purlin is a 700*1300mm reinforced concrete beam, and the H-shaped steel is wrapped in the reinforced concrete beam.

5. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 1 is characterized by: The perimeter purlin includes perimeter purlin one, perimeter purlin two, perimeter purlin three, perimeter purlin four, perimeter purlin five, perimeter purlin six, perimeter purlin seven, perimeter purlin eight and perimeter purlin nine. Perimeter purlin two and perimeter purlin three are parallel. Perimeter purlin one is connected to one end of perimeter purlin two and perimeter purlin three. Perimeter purlin four, perimeter purlin five and perimeter purlin six are connected in sequence. Perimeter purlin four is connected to one end of perimeter purlin two. Perimeter purlin six is ​​connected to one end of perimeter purlin three. Perimeter purlin seven, perimeter purlin eight and perimeter purlin nine are connected in sequence. Perimeter purlin seven is connected to perimeter purlin six and perimeter purlin three. Perimeter purlin nine is connected to perimeter purlin three.

6. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 5 is characterized by: The second purlin is parallel to the third purlin, an even number of steel pipes 1 are arranged between the second purlin and the third purlin, every two steel pipes 1 are grouped together, and the middle of each group of steel pipes 1 is connected by steel pipe 2.

7. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 6 is characterized by: Steel pipe three is installed between the first purlin, the second purlin and the third purlin, and the steel pipe three is inclined.

8. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 7 is characterized by: The seventh and ninth surrounding purlins are parallel, and a plurality of parallel steel pipes four are installed between the seventh and ninth surrounding purlins, and the steel pipes four are parallel to the eighth surrounding purlin.

9. The H-beam + Larsen steel sheet pile combined deep foundation pit support construction method according to claim 8, characterized in that: The first purlin is perpendicular to the second purlin, the H-shaped steel at the connection between the first purlin and the second purlin is arranged horizontally or vertically, and the horizontally arranged H-shaped steel and the vertically arranged H-shaped steel are connected by inclinedly arranged Larsen steel sheet piles.

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