CN214614090U - Composite pre-stressed precast pile foundation pit supporting structure - Google Patents

Abstract

The utility model relates to a compound prestressing force precast pile foundation pit supporting construction, including arranging in proper order and a plurality of cement mixing piles of mutual interlock cylinder shape, a plurality of cement mixing piles form the water shutoff curtain, be equipped with a plurality of square tubular precast piles of end to end in the water shutoff curtain, pile body one side of precast pile is protruding type tooth, and the opposite side is the concave groove of indent with protruding type tooth matched with, the compound prestressing force precast pile foundation pit supporting construction, form the water shutoff curtain through the cement mixing pile who arranges in proper order and mutual interlock, prevent groundwater from getting into the foundation pit; the prestressed precast pile is fixed in the cement mixing pile, is of a square tubular structure and is connected end to form a stiff body of the composite prestressed precast pile formed by the precast pile and the cement mixing pile, and the stiff body bears the water pressure and the soil pressure of the side wall of the foundation pit and protects the foundation pit.

Description

Composite pre-stressed precast pile foundation pit supporting structure

Technical Field

The utility model relates to an engineering's underground structure field such as industry, civilian, municipal administration, specific is a compound prestressing force precast pile underground structure.

Background

Along with the continuous development of urbanization and underground space utilization in recent years, high-rise and super high-rise buildings are increasingly increased, various large-scale projects such as underground stations, underground parking lots, underground shopping malls, underground passages, bridge foundations and the like are continuously developed, the rapid development of foundation pit engineering theories and technical levels is promoted, and foundation pit supporting technology is greatly developed and improved. Common soil nailing wall supporting structure is applicable to the foundation ditch that ground water level is darker, the soil layer is compacter, and soil cement gravity type supporting structure cement quantity is big, the working face is big, the cost is high to simple cement soil pile bending resistance bearing capacity is poor, the steel sheet pile is strutted and is applicable to the softer, the shallow engineering of foundation ditch of soil layer, underground continuous wall supporting structure reinforcing bar quantity is big, the construction cycle is long, the cost is high, current technique lacks a foundation ditch supporting structure that can adapt to the shallower all kinds of soil layers of ground water level.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem who exists among the prior art, a compound prestressing force precast pile underground structure is provided.

The technical scheme of the utility model specifically does:

the utility model provides a compound prestressing force precast pile foundation ditch supporting construction, is including arranging a plurality of cement mixing piles of the cylinder shape of mutual interlock in proper order, a plurality of cement mixing piles form the water containment curtain, be equipped with a plurality of end to end's square tubular precast pile in the water containment curtain, pile body one side of precast pile is bellied protruding type tooth, and the opposite side is the concave groove with protruding type tooth matched with indent.

The cross section length of precast pile is more than or equal to 600mm, and the width is more than or equal to 600 mm.

The precast pile is of a hollow structure, and the hollow structure of the precast pile is located in the mutual occlusion area of the cement soil mixing pile.

The protruding height of convex tooth equals the recess degree of depth of concave groove, is 100 mm.

The precast pile comprises a high-strength concrete pile body serving as a main body structure, prestressed reinforcements and common reinforcements which are distributed on four sides of the precast pile in an intersecting mode, and stirrups which are perpendicular to the prestressed reinforcements and the common reinforcements, wherein the wall thickness of the precast pile is 110-130 mm.

The material of pile body is high strength concrete material, high strength concrete intensity grade more than or equal to C60, the material of prestressing steel is tensile strength more than or equal to 1420MPa, 35 levels of ductile spiral groove steel bar for the low relaxation prestressing concrete.

The pile top of the precast pile and the cement soil mixing pile is provided with a reinforced concrete anchor beam, and a soil anchor rod is arranged and fixed in the anchor beam in a penetrating manner.

Compared with the prior art, the composite prestressed precast pile foundation pit supporting structure of the utility model forms a closed water curtain by the cement soil mixing piles which are arranged in sequence and mutually engaged, so that the underground water is prevented from entering the foundation pit; the prestressed precast pile is fixed in the cement mixing pile, is of a square tubular structure and is connected end to form a stiff body of the composite prestressed precast pile formed by the precast pile and the cement mixing pile, and the stiff body bears the water pressure and the soil pressure of the side wall of the foundation pit and protects the foundation pit.

The precast pile is structurally provided with convex teeth and concave grooves, the convex teeth and the concave grooves are matched with each other, two adjacent precast piles are connected with each other to form a row of supporting structures, the bending resistance bearing capacity of the cement soil mixing pile is obviously increased, the hollow structure of the precast pile is located in the crossed occlusion area of the cement soil mixing pile, the precast pile and the cement soil mixing pile are combined with each other in strength, and a composite pile body with excellent rigidity, strength and water blocking performance is formed. The precast pile adopts prestressing steel and ordinary reinforcing bar to combine together, has effectively saved the quantity of reinforcing bar, has increaseed precast pile's bearing capacity, and to the great foundation ditch of lateral pressure, sets up the anchor beam on the pile bolck to the fixed soil stock, undertakes soil pressure and water pressure on the foundation ditch lateral wall jointly by compound prestressing force precast pile and soil stock, ensures foundation ditch safety. Composite prestressing force precast pile foundation ditch supporting construction can adapt to the more shallow multiple soil layer structure of ground water level, the construction is swift, the water proof is effectual, can be used for deep basal pit engineering, and can regard as the permanent enclosure of basement, save the major structure investment, reduce engineering cost.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a precast pile.

Fig. 3 is a schematic view of the use state of the anchor rod without soil.

Fig. 4 is a schematic view of the utility model in use after the earth anchor rod is installed.

Wherein, 1 is a precast pile; 2 is a cement soil mixing pile; 3 is a pile body; 4 is prestressed reinforcement; 5 is common steel bar; 6 is a stirrup; 7 is an anchor beam; 8 is a soil anchor rod; 9 is the bite area; 10 is a male tooth; 11 is a concave groove; 12 is a foundation pit; 13 is a foundation pit bottom; 14 is the design ground; 15 is a water or water-weakly permeable layer.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

As shown in fig. 1-4, the utility model provides a compound prestressing force precast pile foundation ditch supporting construction, including precast pile 1 and cement mixing pile 2, cement mixing pile 2 is the cylinder shape, and the vertical fixation is around foundation ditch 12, and a plurality of cement mixing piles 2 arrange in proper order and mutual interlock formation closed water curtain, with foundation ditch 12 surround all around, prevents groundwater from getting into foundation ditch 12. A plurality of precast piles 1 connected end to end are fixed in the water-tight curtain, the axis of each precast pile 1 is overlapped with that of the water-tight curtain, each precast pile 1 is of a hollow square tube structure, the hollow structure of each precast pile 1 is located in the mutual occlusion area of the cement soil mixing piles 2, and the wall thickness of each precast pile 1 is 110-130 mm. Pile body one side of precast pile 1 is bellied protruding type tooth 10, and the opposite side structure relative with protruding type tooth 10 is the concave groove 11 of indent, and the protruding height of protruding type tooth 10 equals with the groove depth of concave groove 11, and optimal length is 100mm, and protruding type tooth 10 and concave groove 11 mutually support, make two adjacent precast piles 1 can link up each other, and the distance between two adjacent precast piles 1 is preferred to be established to 30 mm. The length L1 of the cross section of the precast pile 1 is more than or equal to 600mm, and the width L2 is more than or equal to 600 mm.

Further, precast pile 1 includes pile body 3, prestressing steel 4, ordinary reinforcing bar 5 and stirrup 6, pile body 3 is as precast pile 1's major structure, ordinary reinforcing bar 5 and prestressing steel 4 are vertical to be fixed in pile body 3, ordinary reinforcing bar 5 evenly distributed is on two edges at protruding type tooth 10 and concave groove 11 place, prestressing steel 4 evenly distributed with protruding type tooth 10, two edges of concave groove 11 place limit vertically, stirrup 6 centers on prestressing steel 4 and ordinary reinforcing bar 5's periphery, with prestressing steel 4 and ordinary reinforcing bar 5 looks perpendicular and connection, provide oblique cross-section shear strength for precast pile 1.

Furthermore, the pile body 3 of the precast pile 1 is made of high-strength concrete, the strength grade of the high-strength concrete is greater than or equal to C60, and the prestressed reinforcement 4 is made of a spiral-groove steel bar for low-relaxation prestressed concrete with the tensile strength of greater than or equal to 1420MPa and 35 grades ductility. The normal reinforcing steel bars 5 can adopt HPB300 grade or HRB400 grade reinforcing steel bars, and the specifications and the number of the prestressed reinforcing steel bars 4 and the normal reinforcing steel bars 5 can be determined according to the actual engineering requirements.

Further, for the foundation pit engineering which needs to be supported by the foundation pit and has larger lateral pressure of the foundation pit supporting, an anchor rod supporting structure can be added, a reinforced concrete coping anchor beam 7 is fixed on the pile top of the composite pre-stressed precast pile formed by the precast pile 1 and the cement soil mixing pile 2, a hole is punched on the anchor beam 7 to serve as a construction hole of the soil anchor rod 8, the soil anchor rod 8 penetrates through the construction hole on the anchor beam 7 to be inserted into the soil body, the end part of the soil anchor rod 8 at the anchor beam 7 is fixed, and the composite pre-stressed precast pile supporting structure and the anchor rod supporting structure are formed to share the soil pressure and the water pressure on the side wall of the foundation pit.

When the composite prestressed precast pile foundation pit supporting structure is used, the precast pile 1 is pressed in before the cement soil mixing pile 2 is initially set, the bottom of the pile is inserted into the waterproof or weakly permeable layer 15 below the foundation pit bottom 13, and the pile top is pressed to the height of the designed ground 14; if the top of the composite prestressed precast pile is provided with an anchor rod supporting structure, the top of the anchor beam 7 is pressed down to the designed ground 14 height. The cement-soil mixing pile 2 in the composite pre-stressed precast pile foundation pit supporting structure forms a water-closing curtain to prevent underground water from entering a foundation pit, after the precast pile 1 is pressed into the cement-soil mixing pile 2, the adjacent precast piles 1 are connected end to end, bending strength is provided for the cement-soil mixing pile 2, the bearing capacity of the foundation pit supporting structure formed by the cement-soil mixing pile 2 and the precast pile 1 is enhanced, the water-blocking performance is good, the foundation pit supporting structure can be suitable for soil layers such as silt with shallow underground water level, mucky soil, silt, silty clay, sandy soil and saturated loess, the precast pile is simple to manufacture, the cement-soil mixing pile is quick to construct, the construction technical requirement is low, the foundation pit supporting structure is strong in soil layer adaptability and can be used for deep foundation pit engineering, the supporting structure can be used as permanent enclosure of a basement, the investment of a main structure is saved, and the construction cost is reduced.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the general inventive concept, and it is intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims (7)

1. The utility model provides a compound prestressing force precast pile foundation ditch supporting construction, includes a plurality of cement mixing piles (2) of the cylindrical shape of arranging in proper order and mutual interlock, a plurality of cement mixing piles (2) form closed water curtain, its characterized in that: a plurality of square tubular precast piles (1) connected end to end are arranged in the water-tight curtain, one side of a pile body of each precast pile (1) is provided with a convex tooth (10), and the other side of the pile body of each precast pile is provided with a concave groove (11) which is concave and matched with the convex tooth (10).

2. The composite pre-stressed precast pile foundation pit supporting structure of claim 1, wherein: the cross section length of precast pile (1) is greater than or equal to 600mm, and the width is greater than or equal to 600 mm.

3. The composite pre-stressed precast pile foundation pit supporting structure of claim 1, wherein: the precast pile (1) is of a hollow structure, and the hollow structure of the precast pile (1) is located in the mutual occlusion area of the cement soil mixing pile (2).

4. The composite pre-stressed precast pile foundation pit supporting structure of claim 1, wherein: the protruding height of the convex teeth (10) is equal to the depth of the grooves of the concave grooves (11), and the protruding height is 100 mm.

5. The composite pre-stressed precast pile foundation pit supporting structure of claim 1, wherein: precast pile (1) is including high-strength concrete pile body (3) as major structure, crossing prestressing steel (4) and ordinary reinforcing bar (5) of distributing on precast pile (1) four sides and stirrup (6) with prestressing steel (4) and ordinary reinforcing bar (5) perpendicular setting, precast pile (1) wall thickness is 110~130 mm.

6. The composite pre-stressed precast pile foundation pit supporting structure of claim 5, wherein: the material of pile body (3) is the high strength concrete material, high strength concrete intensity grade more than or equal to C60, the material of prestressing steel bar (4) is tensile strength more than or equal to 1420MPa, 35 levels ductile spiral groove steel bar for the low relaxation prestressed concrete.

7. The composite pre-stressed precast pile foundation pit supporting structure of claim 1, wherein: the pile top of the precast pile (1) and the cement soil mixing pile (2) is provided with a reinforced concrete anchor beam (7), and a soil anchor rod (8) is arranged in the anchor beam (7) in a penetrating manner and is fixed.

Images