A static pressure advanced steel pipe inclined support structure system

Abstract

The utility model discloses a static pressure advanced steel pipe oblique bracing support structure system, which belongs to the field of deep foundation pit support, and includes: supporting piles, crown beams, corbels, steel casings, and oblique bracing steel pipes; the crown beams are arranged on the top of the supporting piles; corbels with inclined working surfaces are arranged at intervals on the top of the crown beams, which are used to support the static pressure equipment of anchor rods; anchor bolts are embedded in the corbels, and the crown beams and corbels are cast at the same time to form a whole; steel casings are embedded in the crown beams and corbels, and the axis of the steel casings is perpendicular to the inclined surface of the corbels. The supporting piles, crown beams, and corbels support structure system itself provide a reaction force system, and the oblique bracing steel pipe is pressed from the steel casing into the soil in the foundation pit to the designed depth at a fixed angle through the static pressure equipment of anchor rods, and the inside of the oblique bracing steel pipe is filled with fine stone concrete; the upper and lower ends of the steel casings and the gaps around the oblique bracing steel pipes are welded for consolidation connection. The structural system provided by the utility model has the advantages of precise angle control, small required operating space, high efficiency, large bearing capacity, and convenient detection.

Description

Technical Field

[0001] The utility model relates to the field of deep foundation pit support, in particular to a static pressure advanced steel pipe oblique bracing support structure system. Background Art

[0002] The advanced inclined steel pipe bracing support technology is a new deep foundation pit support technology in recent years. It has been gradually widely used in the construction of urban underground space in my country. It is particularly suitable for foundation pit projects with large plane area and one-story basement. It has the advantages of convenient excavation, low cost, strong deformation control ability, saving construction period, and no need to leave post-casting strips or construction joints. The principle is to vibrate or statically press the advanced steel pipe inclined bracing into the soil in the foundation pit to the designed depth to provide support for the advanced steel pipe inclined bracing. The enclosure structure and the advanced steel pipe inclined bracing are combined as the foundation pit support structure to control the deformation of the foundation pit and the stability of the enclosure structure.

[0003] Currently, the most common advanced steel pipe inclined throw support is to be pressed into the soil in the foundation pit by means of mechanical arm vibration or static pressure machinery with built-in counterweight blocks after the construction of the supporting piles is completed and before the cap beam is cast. After the construction of the steel pipe inclined throw support is completed, the upper end of the steel pipe inclined throw support and the cap beam are cast as a whole. This technology has the following problems: (1) The angle of the advanced steel pipe diagonal brace is difficult to control and often depends on the experience level of the machine operator. The angle of the steel pipe diagonal brace has a great influence on its bearing capacity. (2) The use of a mechanical arm to vibrate and press in will disturb the soil layer below the bottom of the pit, thereby affecting the bearing capacity of the steel pipe diagonal brace. The mechanical arm is a modified excavator, and the bearing capacity of a single pile is limited. At the same time, the mechanical vibration brings noise pollution, especially in downtown areas and residential areas, causing complaints and delays in construction. (3) A static pressure machine with its own counterweight is used to press the steel pipe diagonal brace into the soil in the foundation pit, which requires a large site space, high site requirements, low work efficiency, and high cost. (4) It is inconvenient to detect the bearing capacity of the advanced steel pipe diagonal brace in the later stage. Counterweight blocks or separate reaction frames are required as reaction support structures, which takes a long time to install and has poor economic efficiency. Utility Model Content

[0004] Purpose of the utility model: The utility model mainly solves the technical problems existing in the existing advanced steel pipe diagonal bracing, and proposes a method of utilizing the retaining structure itself as the reaction system of the anchor static pressure equipment. By pre-burying fixed-angle steel casings in the crown beam and the corbel as guides, during the process of the advanced steel pipe diagonal bracing being pressed into the soil, the load system of the static pressure equipment can detect the bearing capacity of the advanced steel pipe diagonal bracing, and provide feedback to the design and construction, thereby dynamically adjusting the foundation pit support design plan to avoid the occurrence of foundation pit accidents.

[0005] To solve the above technical problems, the utility model is: a static pressure advanced steel pipe oblique bracing support structure system, including: support piles 10, crown beams 20, crown beam upper corbels 30, anchor bolts 40, shear bolts 50, steel casings 60, anchor static pressure equipment 70, oblique bracing steel pipes 80, fine stone concrete 90, bottom plate cushion layer 100, basement bottom plate 110, concrete force transmission belt 120, basement outer wall 130.

[0006] The upper end of the support pile 10 is fixedly connected to the crown beam 20; the upper part of the crown beam 20 is provided with a corbel 30 with an inclined static pressure working surface for supporting the anchor static pressure equipment 70; the lower end of the anchor bolt 40 is embedded in the corbel 30, and the upper end is extended to fix the anchor static pressure equipment 70; the crown beam 20 and the corbel 30 are embedded with a steel casing 60, and the side wall of the steel casing 60 is installed with a shear bolt 50; the crown beam 20 and the corbel 30, the anchor bolt 40, and the steel casing 60 are integrally cast and fixed to form a whole;

[0007] The support piles 10, the crown beams 20, and the corbels 30 form a static pressure reaction system; the diagonal brace steel pipe 80 is pressed from the steel casing 60 into the soil in the foundation pit to the designed depth through the anchor static pressure device 70; after the diagonal brace steel pipe 80 is pressed into the designed depth, the diagonal brace steel pipe 80 is filled with fine stone concrete 90 to increase the bearing capacity of the diagonal brace steel pipe;

[0008] The steel casing 60 is a cylindrical hollow structure, the inner diameter of the steel casing 60 is slightly larger than the outer diameter of the diagonal bracing steel pipe 80, the steel casing 60 is integrally cast in the corbel 30 and the crown beam 20, and the upper and lower circles of the diagonal bracing steel pipe 80 in the corbel 30 and the crown beam 20 are welded and connected to the gaps at the upper and lower ends of the steel casing 60;

[0009] The axes of the anchor bolts 40 and the steel casing 60 are perpendicular to the inclined working surface of the corbel 30, so that the diagonal bracing steel pipe 80 can be better pressed into the soil in the foundation pit;

[0010] The brackets 30 are arranged on the crown beam 20 at intervals according to the arrangement of the diagonal bracing steel pipes;

[0011] The diagonal bracing steel pipe 80 passes through the basement floor 110 and the floor cushion 100; the inner side of the supporting pile 10 is connected to the basement floor 110 and the floor cushion 100, and a concrete force transmission belt 120 is provided in the gap between the basement floor 110 and the supporting pile 10, and the concrete force transmission belt 120 is fixedly connected to the inner side of the supporting pile 10; the function of the concrete force transmission belt 120 is to transmit the lateral pressure generated by the supporting pile 10 to the basement floor 110 with sufficient bearing capacity through the concrete force transmission belt 120;

[0012] The basement exterior wall 130 is arranged on the basement floor 110 ; the basement floor 110 is located above the floor cushion layer 100 , and the diagonal bracing steel pipe 80 is provided with a waterproof structure at the inner position of the basement floor 110 through which it passes.

[0013] After the basement floor 110 and the concrete force transmission belt 120 reach the designed strength, the diagonal bracing steel pipe 80 is cut off, and the cutting range is from the upper surface of the basement floor 110 to the lower end of the steel casing 60.

[0014] The implementation steps are as follows:

[0015] First, the support pile 10 is constructed, and the anchor bolts 40, the steel casing 60 and the shear bolts 50 are embedded on the top of the support pile 10, and the crown beam 20 and the bracket 30 with the inclined working surface on the upper part of the crown beam are integrally cast;

[0016] Furthermore, the inclined surface of the bracket 30 is a static pressure working surface, and the anchor static pressure device 70 is fixedly installed by the anchor bolt 40. The center of the anchor static pressure device 70 coincides with the center of the steel sleeve 60. The inclined working surface of the bracket 30 is perpendicular to the axis of the anchor static pressure device 70, the steel sleeve 60, and the anchor bolt 40, so that the diagonal brace steel pipe 80 can be smoothly pressed in;

[0017] Furthermore, the anchor static pressure device 70 holds the diagonal bracing steel pipe 80 tightly, and presses the diagonal bracing steel pipe 80 into the soil in the foundation pit to the required design depth through the pre-buried fixed-angle hollow structural steel casing 60 as a guide;

[0018] Further, the anchor static pressure equipment 70 is evacuated, and the diagonal bracing steel pipe 80 is filled with fine stone concrete 90;

[0019] Furthermore, the upper and lower ends of the steel casing 60 and the upper and lower gaps of the diagonal bracing steel pipe 80 are fixedly connected by welding;

[0020] Beneficial effects: Most of the existing advanced steel pipe diagonal braces are pressed into the soil in the foundation pit by mechanical arm vibration, and there are defects such as the inability to detect the bearing capacity of the advanced diagonal brace steel pipe during the pressing process, high noise, inaccurate angle control, and low bearing capacity. Compared with the existing technology, the utility model provides a static pressure advanced steel pipe diagonal brace support structure system, which uses the enclosure structure system itself as the reaction system of the anchor static pressure equipment, and pre-buries a fixed angle steel casing in the crown beam and the corbel as a guide. During the process of the advanced steel pipe diagonal brace being pressed into the soil, the bearing capacity of the advanced steel pipe diagonal brace can be detected by the load system of the static pressure equipment, which solves the current deficiencies and defects of the advanced steel pipe diagonal brace. This structure has the advantages of simple operation, small required operating space, convenient construction, high efficiency, low cost, large bearing capacity, energy saving and environmental protection, high accuracy, and convenient bearing capacity detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a static pressure advanced steel pipe inclined bracing support structure system;

[0022] Figure 2 It is a three-dimensional schematic diagram of a static pressure advanced steel pipe inclined bracing support structure system;

[0023] Figure 3 It is a top view of the crown beam and corbel;

[0024] Figure 4 It is the side projection diagram of the connection between the steel casing and the diagonal bracing steel pipe;

[0025] Figure 5 Front projection view of the connection between steel casing and diagonal bracing steel pipe.

[0026] In the figure: 10, supporting piles; 20, crown beam; 30, corbel (upper part of crown beam); 40, anchor bolts; 50, shear bolts; 60, steel casing; 70, anchor static pressure equipment; 80, diagonal bracing steel pipe; 90, fine stone concrete; 100, bottom plate cushion; 110, basement floor; 120, concrete force transfer belt; 130, basement exterior wall. DETAILED DESCRIPTION

[0027] The present invention is further explained in detail below in conjunction with the accompanying drawings. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art (including but not limited to steel lattices, steel sections and other advanced diagonal bracing steel components) all fall within the scope defined by the claims attached to this application.

[0028] refer to Figure 1-5 As shown, the utility model provides a static pressure advanced steel pipe oblique support structure system:

[0029] in Figure 1 It is a schematic diagram of a static pressure advanced steel pipe inclined bracing support structure system; Figure 2 A three-dimensional schematic diagram of a static pressure advanced steel pipe inclined bracing support structure system; Figure 3 It is a top view of the crown beam and corbel; Figure 4 It is the side projection diagram of the connection between the steel casing and the diagonal bracing steel pipe; Figure 5 The utility model device comprises: support piles 10, crown beams 20, upper corbels 30 of crown beams, anchor bolts 40, shear bolts 50, steel casings 60, anchor static pressure equipment 70, braced steel pipes 80, fine stone concrete 90, bottom plate cushion 100, basement bottom plate 110, concrete force transmission belt 120, and basement outer wall 130.

[0030] The upper end of the support pile 10 is fixedly connected to the crown beam 20;

[0031] The crown beam 20 and the corbel 30 are integrally cast and fixedly connected;

[0032] Before pouring concrete on the crown beam 20 and the corbel 30, the anchor bolts 40, the steel casing 60 and the shear bolts 50 on the steel casing 60 are embedded. The anchor bolts 40 are used to fix the anchor static pressure equipment 70 on the inclined working surface of the corbel 30. The steel casing 60 is a cylindrical hollow structure with an inner diameter slightly larger than the outer diameter of the diagonal bracing steel pipe 80. The anchor bolts 40 and the steel casing 60 are perpendicular to the inclined working surface of the corbel 30.

[0033] The support piles 10, the crown beam 20, the corbels 30 with inclined working surfaces, and the anchor bolts 40 are pre-buried to form a static pressure system reaction force;

[0034] The anchor static pressure device 70 holds the diagonal brace steel pipe 80 tightly, and presses the diagonal brace steel pipe 80 into the soil in the foundation pit through the fixed angle steel casing 60 to the required design depth;

[0035] The anchor static pressure equipment 70 is removed, and the diagonal bracing steel pipe 80 is filled with fine stone concrete 90;

[0036] The upper and lower ends of the steel casing 60 and the upper and lower gaps of the diagonal bracing steel pipe 80 are connected by welding.

[0037] The diagonal bracing steel pipe 80 passes through the basement floor 110 and the floor cushion 100; the inner side of the support pile 10 is connected to the basement floor 110 and the floor cushion 100 through a concrete force transmission belt 120. The basement outer wall 130 is set on the basement floor 110;

[0038] The diagonal bracing steel pipe 80 is provided with a waterproof structure at an inner position of the basement floor 110 through which it passes; the waterproof structure is a well-known technology.

[0039] The diagonal bracing steel pipe 80 is cut off after the basement floor 110 and the concrete force transmission belt 120 reach the designed strength, and the cutting range is from the upper surface of the basement floor 110 to the lower end of the steel casing 60 .

[0040] The specific construction steps are as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown,

[0041] First construct support piles 10;

[0042] Then, the crown beam 20 and the corbel 30 steel bars with the inclined static pressure working surface are tied, and according to the angle of the steel pipe inclined brace 80 required by the design, the anchor bolts 40, the steel casing 60 and the shear bolts 50 on the steel casing 60 are buried at a fixed angle, and the angles of the anchor bolts 40 and the steel casing 60 are perpendicular to the inclined working surface of the corbel 30;

[0043] The crown beam 20 and the corbel 30 are then cast and consolidated to form a whole;

[0044] Then, the anchor rod static pressure equipment 70 is fixedly installed on the inclined static pressure working surface bracket 30 by means of anchor bolts 40;

[0045] The rear anchor static pressure device 70 holds the diagonal bracing steel pipe 80 tightly, and presses the diagonal bracing steel pipe 80 into the soil in the foundation pit through the fixed angle steel casing 60 to the design required depth;

[0046] Then, the anchor static pressure equipment 70 is evacuated, and the steel pipe inclined support 80 is filled with fine stone concrete 90 to the upper end of the steel pipe inclined support;

[0047] The upper and lower ends of the rear steel casing 60 and the upper and lower gaps of the diagonal bracing steel pipe 80 are welded and connected;

[0048] After the support structure system is formed, the earthwork is excavated to the bottom of the basement cushion layer, the basement cushion layer 100 is poured, the diagonal bracing steel pipe 80 is provided with a waterproof structure at the inner position of the basement floor 110 that passes through, and the basement floor 110 and the concrete force transmission belt 120 are poured to the inner side of the support pile 10;

[0049] After the basement floor 110 and the concrete force transmission belt 120 reach the designed strength, the diagonal bracing steel pipe 80 is cut off and recycled;

[0050] Afterwards, the basement outer wall 130 is constructed to the ground, and the fertilizer trough between the support pile 10 and the basement outer wall 130 is backfilled according to the structural design requirements, so as to solve the shortcomings or defects such as inaccurate angle control, serious noise pollution, difficult bearing capacity detection, and low bearing capacity in the existing advanced steel pipe inclined support construction.

Claims

1. A static pressure advanced steel pipe inclined bracing support structure system, comprising: Support piles (10), crown beams (20), corbels (30), anchor bolts (40), shear bolts (50), steel casings (60), anchor static pressure equipment (70), diagonal bracing steel pipes (80), fine stone concrete (90), basement cushion (100), basement floor (110), concrete force transmission belt (120), basement exterior wall (130); The invention is characterized in that: the upper end of the support pile (10) is fixedly connected to the crown beam (20); the upper part of the crown beam (20) is provided with a corbel (30) with an inclined static pressure working surface for supporting the anchor static pressure equipment (70); the lower end of the anchor bolt (40) is pre-buried in the corbel (30), and the upper end is extended to fix and install the anchor static pressure equipment (70); the crown beam (20) and the corbel (30) are pre-buried with steel casing (60), and the side wall of the steel casing (60) is installed with shear bolts (50); the crown beam (20) and the corbel (30), the anchor bolt (40), and the steel casing (60) are integrally cast and fixedly connected to form a whole; The support piles (10), the crown beams (20), and the corbels (30) form a static pressure reaction system; the diagonal brace steel pipe (80) is pressed from the steel casing (60) into the soil in the foundation pit to a designed depth through the anchor static pressure device (70); after the diagonal brace steel pipe (80) is pressed into the designed depth, fine stone concrete (90) is filled into the diagonal brace steel pipe (80) to increase the bearing capacity of the diagonal brace steel pipe; The steel casing (60) is a cylindrical hollow structure. The inner diameter of the steel casing (60) is slightly larger than the outer diameter of the diagonal bracing steel pipe (80). The steel casing (60) is integrally cast in the corbel (30) and the crown beam (20). The upper and lower circles of the diagonal bracing steel pipe (80) in the corbel (30) and the crown beam (20) are welded and fixedly connected to the gaps at the upper and lower ends of the steel casing (60). The axes of the anchor bolts (40) and the steel sleeve (60) are perpendicular to the inclined working surface of the bracket (30), so that the diagonal bracing steel pipe (80) can be better pressed into the soil in the foundation pit; The brackets (30) are arranged on the crown beam (20) at intervals according to the arrangement of the diagonal bracing steel pipes; The diagonal bracing steel pipe (80) passes through the basement floor (110) and the floor cushion layer (100); the inner side of the supporting pile (10) is connected to the basement floor (110) and the floor cushion layer (100); a concrete force transmission belt (120) is provided in the gap between the basement floor (110) and the supporting pile (10); the concrete force transmission belt (120) is fixedly connected to the inner side of the supporting pile (10); the function of the concrete force transmission belt (120) is to transmit the lateral pressure generated by the supporting pile (10) to the basement floor (110) having sufficient bearing capacity through the concrete force transmission belt (120); The basement exterior wall (130) is arranged on the basement floor (110); the basement floor (110) is located above the floor cushion layer (100).

2. According to claim 1, a static pressure advanced steel pipe oblique bracing support structure system is characterized by: After the basement floor (110) and the concrete force transmission belt (120) reach the designed strength, the diagonal bracing steel pipe (80) is cut off, and the cutting range is from the upper surface of the basement floor (110) to the lower end of the steel casing (60).

3. The static pressure advanced steel pipe oblique bracing support structure system according to claim 1 is characterized in that: The diagonal bracing steel pipe (80) is provided with a waterproof structure at an inner position of the basement floor (110) through which it passes.

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