A deep foundation pit retaining system and construction method

Abstract

The present invention discloses a deep foundation pit retaining system and a construction method, which relates to the technical field of foundation pit retaining. The present invention includes steel piles arranged at intervals in a staggered manner along the side wall of the foundation pit. A purlin is fixed on each of the two side surfaces of the steel pile. A capping beam is fixed at the top of the steel pile. A support seat is clamped between the top of the steel pile and the bottom of the capping beam. A base cooperating with the steel pile is fixed at the bottom of the steel pile. An anchor is penetrated through the base, and the steel pile is fixedly connected to the base through the anchor. A plurality of adjusting rods are hinged to the side surface of the purlin away from the steel pile. In the foundation pit retaining system of the present invention, steel piles arranged at intervals in a staggered manner are used as the main fixed piles. A support seat is arranged at the top of the steel pile to fix the capping beam, and a base penetrated with an anchor is arranged at the bottom of the steel pile as the foundation, so that the installation of the entire retaining system is more firm, the stability of the entire retaining system is improved, and each component constituting the retaining system can be removed after use, enabling the components in the retaining system to be recycled.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit retaining, and particularly relates to a deep foundation pit retaining system and a construction method. Background Technique

[0002] The excavation of deep foundation pits is an important construction procedure for underground structures of modern large-scale buildings. In the prior art, the retaining and support of foundation pits mostly adopt reinforced concrete structures. However, the construction period of the retaining of reinforced concrete structures is long, the deformation of the retaining during the construction process of the foundation pit cannot be adjusted, and the workload of demolishing the ring beams and diaphragm walls of the retaining is very large and they cannot be recycled.

[0003] In the foundation pit retaining system of underground engineering, the section of the steel section is simple, with good mechanical properties. Moreover, as a component of this kind of temporary project such as the foundation pit, it can be recycled and reused multiple times after the foundation pit is used, which has good economy. Therefore, it is widely used in underground engineering. However, the mechanical properties of a single row of steel sections are limited. When the depth of the foundation pit gradually increases, only by increasing the number of support rows can the force and deformation requirements of the retaining structure be met. Even so, restricted by the ultimate performance index of the cross-section of a single row of steel sections, the maximum applicable excavation depth of the foundation pit generally does not exceed 13 meters, and its applicability to deep foundation pits is poor.

[0004] The retaining system is composed of a sheet pile wall, a waling, a capping beam and accessory components, among which the sheet pile wall is mostly constructed with steel sections. The cross-section of the steel sections commonly used in conventional foundation pit retaining bodies is too simple. If the retaining body adopts two rows or multiple rows of ordinary steel sections, due to the inability to effectively connect between the ordinary steel sections, it cannot bear the horizontal deformation of the foundation pit as a whole, and it is difficult to play a better retaining role. Summary of the Invention

[0005] The purpose of the invention is to provide a deep foundation pit retaining system and a construction method. By arranging steel piles at intervals in a staggered manner along the side wall of the foundation pit, a support seat for bearing the capping beam is arranged at the top of the steel pile, a base is arranged at the bottom, and an adjusting rod is arranged on the waling, so that the retaining structure forms a firm overall structure, enhancing the ability to resist water pressure and soil pressure, bearing the horizontal deformation of the foundation pit as a whole, enabling the retaining to be applicable to deeper foundation pits, and being able to play a better retaining role.

[0006] To solve the above technical problems, the invention is realized through the following technical solutions:

[0007] The present invention relates to a deep foundation pit retaining system and a construction method, which includes a number of steel piles arranged at intervals in a staggered manner along the side wall of the foundation pit. The number of the steel piles forms a retaining wall in the retaining system. A waling is fixed on each of the two side surfaces of the number of the steel piles. A capping beam is fixed on the tops of the number of the steel piles. A support base matching with the number of the steel piles is clamped at the position between the tops of the number of the steel piles and the bottom of the capping beam, and the capping beam is arranged inside the support base. A base matching with the steel piles is fixed at the bottom of the number of the steel piles. An anchor is penetrated through the base. The steel pile is fixedly connected with the base through the anchor. A number of adjusting rods are hinged on the side surface of the waling far away from the steel pile, and one ends of the number of the adjusting rods far away from the waling are respectively hinged with the support base and the base.

[0008] As a preferred technical solution of the present invention, the cross-section of the steel pile is an isosceles trapezoid. Mutually matching card slots are arranged on the two side surfaces of the steel pile along its axial direction. Through holes matching with the support base and the anchor are opened at both ends of the steel pile. A limit slot matching with the waling is fixed on one bottom surface of the steel pile.

[0009] As a preferred technical solution of the present invention, the cross-section of the main body of the support base is in a groove shape. A through hole matching with the through hole is opened at the inner bottom of the support base. The support base is fixedly connected with the steel pile through a bolt passing through the through hole and the through hole. One end of the bolt located inside the support base extends into the capping beam. A number of first connecting seats hinged with the adjusting rods are fixed at the bottom edge of the support base.

[0010] As a preferred technical solution of the present invention, a number of upper limit baffles matching with the steel piles are fixed at the bottom of the support base. A number of first reinforcing ribs are fixed on the two side surfaces of the support base.

[0011] As a preferred technical solution of the present invention, the cross-section of the base is in a groove shape with an opening facing downwards. A lower limit baffle matching with the steel pile is fixed at the top of the base. An installation hole matching with the anchor is opened on the base. A number of second connecting seats hinged with the adjusting rods are fixed at the top edge of the base.

[0012] As a preferred technical solution of the present invention, the anchor includes an anchor rod passing through the through hole and the installation hole. A spiral earth-breaking fan blade is fixed on the outer circular surface of a section of the anchor rod located at the bottom of the base. A locking nut is threadedly connected to the outer surface of one end of the anchor rod located inside the steel pile. A hexagonal adjusting column is opened at the top end of the anchor rod.

[0013] As a preferred technical solution of the present invention, the waling is a channel steel. The waling is fixed on the steel pile. A third connecting seat hinged with the adjusting rod is fixed on the side surface far away from the steel pile.

[0014] As a preferred technical solution of the present invention, the adjusting rod includes an internally threaded sleeve, and externally threaded rods are threadedly connected to both ends of the internally threaded sleeve. A hinge seat that is hinged to the first connecting seat and the second connecting seat is fixed to the end of the externally threaded rod away from the internally threaded sleeve.

[0015] A construction method for a deep foundation pit retaining system includes the following steps:

[0016] SS01: According to the length, width, and height of the excavated foundation pit, select steel piles, purlins, support seats, and bases with appropriate lengths;

[0017] SS02: Fix the anchor fittings at the bottom of the foundation pit according to the installation holes opened on the base. Then, lay the base on the bottom of the foundation pit with the installation holes aligned.

[0018] SS03: Install the steel piles on the top of the base according to the lower limit baffles and installation holes on the base. During installation, the through holes are aligned with the installation holes, and lock nuts are used for fixation. Then, install purlins on both sides of the steel piles arranged at staggered intervals.

[0019] SS04: Install the support seat on the top of the retaining wall formed by the steel piles by passing bolts through the through holes. After the support seat is installed, install the adjusting rod, and tighten the entire retaining system by rotating the internally threaded sleeve.

[0020] SS05: Pour a capping beam made of reinforced concrete on the support seat to complete the construction of the deep foundation pit retaining system.

[0021] The present invention has the following beneficial effects:

[0022] 1. The foundation pit retaining system of the present invention uses steel piles arranged at staggered intervals as the main fixing piles, sets a support seat at the top of the steel piles for fixing the capping beam, and sets a base with anchor fittings passing through at the bottom of the steel piles as the foundation, making the installation of the entire retaining system more firm, improving the stability of the entire retaining system, and enabling the components of the entire retaining system to be dismantled after use, so that the components in the retaining system can be recycled.

[0023] 2. The present invention enhances the structural stability between the steel piles, purlins, capping beam, support seat, and base by hinging the adjusting rod on the purlin and hinging the adjusting rod to the support seat and the base respectively, and improves the strength of the entire retaining system against water pressure and soil pressure, and the overall structure bears the horizontal deformation of the foundation pit, enabling the retaining system to be applicable to deeper foundation pits and being adjustable according to needs during installation and use to ensure the firmness of the entire structure during long-term use.

[0024] 3. In the present invention, a base is provided at the bottom, and an anchor is provided on the base for connecting the steel pile and anchoring the base to the bottom of the foundation pit. During use, the installation of the base can be ensured to be stable, avoiding the displacement of the steel pile caused by a large side impact force and preventing the foundation pit from being damaged.

[0025] Of course, it is not necessary for any product implementing the present invention to achieve all of the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of a deep foundation pit retaining system and construction method of the present invention.

[0028] Figure 2 It is a schematic structural diagram from another perspective of the present invention.

[0029] Figure 3 It is a schematic structural diagram in which the steel piles are arranged staggeredly at intervals.

[0030] Figure 4 It is a schematic structural diagram of the steel pile.

[0031] Figure 5 It is a schematic structural diagram from another perspective of the steel pile.

[0032] Figure 6 It is a schematic structural diagram of the cooperation between the base and the anchor.

[0033] Figure 7 It is a schematic structural diagram of the base.

[0034] Figure 8 It is a schematic structural diagram of the anchor.

[0035] Figure 9 It is a schematic structural diagram of the support seat.

[0036] Figure 10 It is a schematic structural diagram of the adjusting rod.

[0037] Figure 11 It is a schematic structural diagram of the waling.

[0038] In the drawings, the list of components represented by each reference numeral is as follows:

[0039] 1. Steel pile; 2. Brace; 3. Capping beam; 4. Support seat; 5. Base; 6. Anchor; 7. Adjusting rod; 8. Bolt; 101. Card slot; 102. Through hole; 103. Limit slot; 201. Third connecting seat; 401. Through hole; 402. First connecting seat; 403. Upper limit baffle; 404. First reinforcing rib plate; 501. Lower limit baffle; 502. Installation hole; 503. Second connecting seat; 601. Anchor rod; 602. Spiral earth-breaking fan blade; 603. Locking nut; 604. Hexagonal adjusting column; 701. Internal thread sleeve; 702. External threaded rod; 703. Hinge seat. Detailed implementation mode

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Specific embodiment 1:

[0042] Please refer to Figures 1-11 As shown in the figure, the present invention is a deep foundation pit retaining system and construction method, including a number of steel piles 1 arranged at intervals in a staggered manner along the side wall of the foundation pit. The number of steel piles 1 constitutes a retaining wall in the retaining system. A brace 2 is fixed on each of the two side surfaces of the number of steel piles 1. A capping beam 3 is fixed on the top of the number of steel piles 1. A support seat 4 matching with the number of steel piles 1 is clamped at the position between the top of the number of steel piles 1 and the bottom of the capping beam 3, and the capping beam 3 is arranged inside the support seat 4. A base 5 matching with the steel pile 1 is fixed at the bottom of the number of steel piles 1. An anchor 6 penetrates through the base 5, and the steel pile 1 is fixedly connected with the base 5 through the anchor 6. A number of adjusting rods 7 are hinged on the side surface of the brace 2 away from the steel pile 1, and the ends of the number of adjusting rods 7 away from the brace 2 are respectively hinged with the support seat 4 and the base 5.

[0043] Among them, the cross-section of the steel pile 1 is an isosceles trapezoid. Card slots 101 that cooperate with each other are arranged along the axial direction on the two side surfaces of the steel pile 1. Through holes 102 that cooperate with the support seat 4 and the anchor 6 are opened at both ends of the steel pile 1. A limit slot 103 that cooperates with the brace 2 is fixed on one bottom surface of the steel pile 1.

[0044] Among them, the cross-section of the base 5 is a groove shape with an open bottom. A lower limit baffle 501 that cooperates with the steel pile 1 is fixed on the top of the base 5. Installation holes 502 that cooperate with the anchor 6 are opened on the base 5. A number of second connecting seats 503 that are hinged with the adjusting rods 7 are fixed on the edge of the top of the base 5.

[0045] Among them, the brace 2 is a channel steel. The brace 2 is fixed on the steel pile 1, and a third connecting seat 201 that is hinged with the adjusting rod 7 is fixed on the side surface away from the steel pile 1.

[0046] Among them, the adjusting rod 7 includes an internally threaded sleeve 701. External threaded rods 702 are threadedly connected to both ends of the internally threaded sleeve 701. A hinge seat 703 that is hinged to the first connection seat 402 and the second connection seat 503 is fixed to one end of the external threaded rod 702 away from the internally threaded sleeve 701.

[0047] A construction method for a deep foundation pit retaining system includes the following steps:

[0048] SS01: According to the length, width, and height of the excavated foundation pit, select steel piles 1, purlins 2, support seats 4, and bases 5 with appropriate lengths;

[0049] SS02: Fix the anchor 6 to the bottom of the foundation pit according to the installation holes 503 opened on the base 5. Then, align the installation holes 503 and lay the base 5 on the bottom of the foundation pit;

[0050] SS03: Install the steel piles 1 on the top of the base 5 according to the lower limit baffle 501 and the installation holes 503 on the base 5. During installation, the through holes 102 are aligned with the installation holes 503, and use locking nuts 603 to fix them. Then, install the purlins 2 on both sides of the alternately arranged steel piles 1;

[0051] SS04: Use bolts 8 to install the support seat 4 through the through holes 102 at the top of the wall formed by the steel piles. After the installation of the support seat 4 is completed, install the adjusting rod 7, and tighten the entire maintenance system by rotating the internally threaded sleeve 701;

[0052] SS05: Pour a capping beam 3 made of reinforced concrete on the support seat 4 to complete the construction of the deep foundation pit retaining system. Specific Embodiment Two:

[0054] Based on Specific Embodiment One, the difference in this embodiment is:

[0055] As Figure 9 shown, the cross-section of the main body of the support seat 4 is in a groove shape. A through hole 401 that cooperates with the through hole 102 is opened at the inner bottom of the support seat 4. The support seat 4 is fixedly connected to the steel pile 1 through bolts 8 passing through the through holes 102 and 401. One end of the bolt 8 located inside the support seat 4 extends into the capping beam 3. A number of first connection seats 402 that are hinged to the adjusting rod 7 are fixed to the bottom edge of the support seat 4. A number of upper limit baffles 403 that cooperate with the steel piles 1 are fixed to the bottom of the support seat 4. A number of first reinforcing ribs 404 are fixed to both side surfaces of the support seat 4. The support seat 4 is arranged at the top of the wall formed by the steel piles 1 to limit the steel piles 1 so that the tops of each steel pile 1 receive uniform pressure from the capping beam 3, avoiding the situation of local settlement of the steel piles 1 during construction and improving the stability of the retaining system. Specific Embodiment Three:

[0057] On the basis of the second specific embodiment, the difference of this embodiment lies in that:

[0058] As Figure 8 shown, the anchor 6 includes an anchor rod 601 passing through the through hole 102 and the mounting hole 502. A spiral earth-breaking fan blade 602 is fixed on the outer circumferential surface of a section of the anchor rod 601 at the bottom of the base 5. A locking nut 603 is threadedly connected to the outer surface of one end of the anchor rod 601 located inside the steel pile 1. A hexagonal adjusting column 604 is provided at the top end of the anchor rod 601. The cooperation of the anchor 6 and the base 5 makes the support of the retaining system at the bottom of the deep foundation pit more stable, and the force is evenly distributed on the base 5, ensuring the firmness of the overall structure of the retaining system.

[0059] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0060] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A deep foundation pit retaining system, comprising a plurality of steel piles (1) arranged at intervals in a staggered manner along the side wall of the foundation pit. The plurality of steel piles (1) form a retaining wall in the retaining system. A waling (2) is fixed to each of the two side surfaces of the plurality of steel piles (1), and a capping beam (3) is fixed to the top of the plurality of steel piles (1). It is characterized in that: A support seat (4) matching with the plurality of steel piles (1) is clamped at the position between the top of the plurality of steel piles (1) and the bottom of the capping beam (3), and the capping beam (3) is arranged inside the support seat (4); A base (5) matching with the steel piles (1) is fixed to the bottom of the plurality of steel piles (1). An anchor (6) passes through the base (5), and the anchor (6) is fixed to the bottom of the foundation pit. The steel pile (1) is fixedly connected to the base (5) through the anchor (6); A plurality of adjusting rods (7) are hinged to the side surface of the waling (2) away from the steel piles (1), and the support seat (4) and the base (5) are respectively hinged to the corresponding adjusting rods (7).

2. The retaining system for deep foundation pit according to claim 1, wherein The cross-section of the steel pile (1) is an isosceles trapezoid. Claw slots (101) that cooperate with each other are arranged along the axial direction on the two side surfaces of the steel pile (1). Through holes (102) that cooperate with the support seat (4) and the anchor (6) are opened at both ends of the steel pile (1). A limit groove (103) that cooperates with the waling (2) is fixed to one side surface of the steel pile (1).

3. A deep foundation pit retaining system according to claim 2, characterized in that, The main cross-section of the support seat (4) is in a groove shape. A through hole (401) that cooperates with the through hole (102) is opened at the inner bottom of the support seat (4). The support seat (4) is fixedly connected to the steel pile (1) through a bolt (8) passing through the through hole (102) and the through hole (401). One end of the bolt (8) located inside the support seat (4) extends into the capping beam (3). A plurality of first connection seats (402) that are hinged to the adjusting rods (7) are fixed to the bottom edge of the support seat (4).

4. The retaining system for deep foundation pit according to claim 3, characterized in that A plurality of upper limit baffles (403) that cooperate with the steel piles (1) are fixed to the bottom of the support seat (4), and a plurality of first reinforcing ribs (404) are fixed to the two side surfaces of the support seat (4).

5. A deep foundation pit retaining system according to claim 4, characterized in that, The cross-section of the base (5) is a groove shape with an open bottom. A lower limit baffle (501) that cooperates with the steel pile (1) is fixed to the top of the base (5). An installation hole (502) that cooperates with the anchor (6) is opened on the base (5). A plurality of second connection seats (503) that are hinged to the adjusting rods (7) are fixed to the top edge of the base (5).

6. A deep foundation pit retaining system according to claim 5, characterized in that, The anchor (6) includes an anchor rod (601) passing through the through hole (102) and the installation hole (502). A spiral earth-breaking fan blade (602) is fixed to the outer circumferential surface of a section of the anchor rod (601) located at the bottom of the base (5). A locking nut (603) is threadedly connected to the outer surface of one end of the anchor rod (601) located inside the steel pile (1). A hexagonal adjusting column (604) is opened at the top end of the anchor rod (601).

7. A deep foundation pit retaining system according to claim 6, characterized in that, The waling (2) is a channel steel. The waling (2) is fixed to the steel pile (1), and a third connection seat (201) that is hinged to the adjusting rod (7) is fixed to the side surface away from the steel pile (1).

8. A deep foundation pit retaining system according to claim 7, characterized in that, The adjusting rod (7) includes an internally threaded sleeve (701). External threaded rods (702) are threadedly connected to both ends of the internally threaded sleeve (701). A hinge seat (703) that is hinged to the first connection seat (402) and the second connection seat (503) is fixed to the end of the external threaded rod (702) away from the internally threaded sleeve (701).

9. The construction method of a deep foundation pit retaining system as claimed in claim 8, characterized in that, It includes the following steps: SS01: Select steel piles (1), waling beams (2), support seats (4), and bases (5) with appropriate lengths according to the length, width, and height of the excavated foundation pit. SS02: Fix the anchor (6) to the bottom of the foundation pit according to the mounting holes (502) provided on the base (5). Then, align the mounting holes (502) and lay the base (5) on the bottom of the foundation pit. SS03: Install the steel piles (1) on the top of the base (5) according to the lower limit baffles (501) and mounting holes (502) on the base (5). During installation, the through holes (102) are aligned with the mounting holes (502), and locking nuts (603) are used for fixation. Then, install the waling beams (2) on both sides of the steel piles (1) arranged at staggered intervals. SS04: Install the support seat (4) on the top of the sheet wall formed by the steel piles (1) using bolts (8) to pass through the through holes (102). After the installation of the support seat (4) is completed, install the adjusting rod (7), and tighten the entire maintenance system by rotating the internally threaded sleeve (701). SS05: Pour a capping beam (3) made of reinforced concrete on the support seat (4) to complete the construction of the deep foundation pit retaining system.

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