CN207143970U - A kind of foundation pit enclosure stake - Google Patents

Abstract

The utility model discloses a foundation pit surrounding protection pile, which comprises a pile body, a plurality of supporting steel bars are arranged through the pile body along the axial direction, and an inner circumferential direction is arranged perpendicular to the axial direction of the pile body on the side of the supporting steel bars adjacent to the center of the pile body. Stirrups, the side of the supporting steel bar adjacent to the surface of the pile body is provided with outer circumferential stirrups perpendicular to the axis of the pile body, and the supporting steel bars are also sleeved with circumferential reinforcing steel bars; grooves are opened on the side walls of the pile body, and the grooves The inside is filled with a filling board, and the filling board is fixedly connected with the pile body through a hoop iron wire; the pile body is penetrated with pre-embedded steel bars. The utility model replaces part of the pile body with grooves and filling plates, which can save space and facilitate the installation of the main structure of the foundation pit, and has the advantages of simple structure, high bearing performance, convenient construction, space saving, relatively low engineering cost, and wide application range advantage.

Description

foundation pit protection pile

technical field

The utility model relates to the technical field of foundation pit protection, in particular to a foundation pit protection pile.

Background technique

The foundation pit is an underground space that is often encountered in the design and construction of urban underground engineering and municipal engineering. It is necessary to adopt various measures to reinforce the rock and soil around the foundation pit to protect the stability and safety of the rock and soil on the wall of the foundation pit, and piles are one of the most commonly used measures in foundation pit engineering.

At present, my country's urban rail transit represented by the subway is developing very rapidly. In order to alleviate the pressure of urban public transportation and promote the rapid development of urban society and economy, major cities have incorporated subway and light rail into the priority development strategy of urban construction. In addition, in order to build a sponge city and solve the waterlogging problem that often occurs during summer rainstorms, various cities are building a large number of urban underground comprehensive utility corridors. Due to the limited urban ground land resources, and the urban ground is often busy with traffic and dense buildings, it is impossible to build subways and municipal underground pipe corridors on the ground in the above-mentioned areas. It is a more feasible and reasonable solution at present.

Due to the influence of the existing buildings, road traffic and other underground piles and foundations of municipal facilities in the city, the scope of foundation pit excavation is limited when constructing underground projects such as subway underground stations, interval tunnels and urban municipal underground pipe corridors. At the same time, in order to protect the stability of the wall rock and soil around the foundation pit and prevent the collapse and instability of the foundation pit, it is necessary to set a certain number of surrounding protection piles around the foundation pit. When the excavation range of the foundation pit is limited and is affected by the underground foundation of the surrounding existing buildings or structures, there will often be no redundant positions around the foundation pit to set the surrounding protection piles of the foundation pit, which will affect the Safety and stability of foundation pits during excavation.

In addition, if the excavation range of the foundation pit is limited, if it is necessary to install the surrounding protection piles of the foundation pit, there will be a situation that the surrounding protection piles will occupy the building space or position of the main structure in the foundation pit after being installed, so the underground main construction project in the foundation pit will be affected. The design and construction of the foundation pit will bring interference and difficulties, and will inevitably affect the intended function and safety of the main building in the foundation pit.

At present, our country is in the prosperous period of urban underground space development and utilization. The development and construction of a large number of underground space projects requires the excavation of a large number of foundation pits. The technical problem of enclosing the foundation pit and the enclosing piles encroaching on the space position of the main building in the foundation pit after being set up requires finding a new type of enclosing piles suitable for enclosing the foundation pit in a complex urban environment.

Contents of the invention

The utility model aims at the above-mentioned deficiencies of the prior art, and provides a foundation pit surrounding protection pile which can save space and facilitate the installation of the main structure of the foundation pit.

In order to solve the problems of the technologies described above, the utility model adopts the following technical solutions:

Provided is a foundation pit enclosure protection pile, which includes a pile body, in which a number of supporting steel bars are arranged through the pile body along the axial direction, and inner circumferential stirrups perpendicular to the axis of the pile body are arranged adjacent to the center side of the supporting steel bars, and the supporting steel bars The side adjacent to the surface of the pile body is provided with outer circumferential stirrups perpendicular to the axis of the pile body, and at least three supporting steel bars are sleeved with circumferential reinforcement bars; grooves are opened on the side walls of the pile body, and filling holes are provided in the grooves. The slab and the filling slab are fixedly connected to the pile body through hoop iron wires; the pile body is penetrated with pre-embedded steel bars.

In the above technical solution, preferably, the cross section of the pile body is circular, oval or polygonal.

In the above technical solution, preferably, the length of the filling plate along the axis of the pile body is less than the total length of the pile body, and the thickness of the filling plate is less than or equal to the height of the groove.

In the above technical solution, preferably, the inner surface of the filling plate adjacent to the pile body is set to a plane that fits with the bottom surface of the groove, and the shape of the outer surface of the filling plate is the same as that of the outer surface of the pile body.

In the above technical solution, preferably, the supporting steel bars are arranged at equal intervals in the pile body; the supporting steel bars adjacent to the filling plate are arranged in a straight line, and the distances between the supporting steel bars away from the filling plate and the outer surface of the pile are equal.

In the above technical solution, preferably, there are at least three circumferential reinforcing bars, the circumferential reinforcing bars are sheathed on the three supporting bars and form a triangular structure, and the spacing of the plurality of circumferential reinforcing bars along the axis of the pile body is equal.

In the above technical solution, preferably, there are at least three inner hoop stirrups and outer hoop hoop stirrups, the intervals between multiple inner hoop hoop stirrups are equal, and the intervals between multiple outer hoop hoop stirrups are equal.

In the above technical solution, preferably, the pre-embedded steel bar is perpendicular to the axis of the pile body, the middle part of the pre-embedded steel bar is parallel to the inner surface of the adjacent filling plate, and the two ends of the pre-embedded steel bar are located outside the pile body.

In the above technical solution, preferably, the hoop iron wire passes through the supporting steel bar on the side adjacent to the filler plate, and is sheathed on the filler plate, and there are at least two hoop iron wires.

In the above technical solution, preferably, the filling board is a foam board.

The main beneficial effects of the above-mentioned foundation pit surrounding protection pile provided by the utility model are:

Partial length of the pile body around the foundation pit is filled with a filling plate of a certain thickness, so that the pile body becomes an incomplete pile. There is no need to pour concrete in the pile body filled with the filling board, and the price of the filling board is much lower than that of concrete, so the engineering cost of the enclosure pile can be reduced.

After the retaining piles are set as incomplete piles, on the one hand, they can withstand the water and soil pressure generated by the strata outside the foundation pit, ensuring the stability of the rock and soil on the wall of the foundation pit, and preventing the foundation pit from being unstable and collapsing. Partial structures of the main structure of the foundation pit, such as side walls, waist beams, etc., are poured in the groove section after the filling board is removed on the body, so as to make up for the lack of space of the main structure in the foundation pit due to the pouring of the enclosure piles, or solve the problem caused by the foundation pit. The pit site is narrow and it is impossible to pour the technical problem of the surrounding piles.

By making a part of the main structure in the foundation pit extend into the preset groove on the surrounding protection piles, the main structure and the surrounding protection piles can be reasonably connected, and the bearing performance of the piles can be improved to solve the problem of space when the foundation pit is excavated. Insufficient, and then the problem of mutual interference between the pile and the main structure, also makes the surrounding protection pile and the main structure of the foundation pit form a common bearing structure.

Description of drawings

Figure 1 is a schematic diagram of the front view structure of the foundation pit surrounding protection pile.

Fig. 2 is a cross-sectional view along the A-A direction of the foundation pit surrounding protection pile.

Fig. 3 is a cross-sectional view along the B-B direction of the foundation pit surrounding protection pile.

Among them, 1. Pile body, 2. Filling plate, 3. Supporting steel bar, 4. Inner hoop hoop, 5. Outer hoop hoop, 6. Hoop reinforcement, 7. Embedded steel bar, 8, hoop iron wire.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Fig. 1 to Fig. 3, they are structural schematic diagrams of foundation pit surrounding protection piles.

The protection pile for the foundation pit of the utility model includes a pile body 1 and a filling plate 2. The pile body 1 is concrete poured in a borehole formed after the rock and soil body is excavated in the stratum. The side wall of the pile body 1 is provided with a concave Groove, filling board 2 is filled in the groove, and the material of filling board 2 can choose foam board; Pile body 1 and filled foam board material 2 together constitute the drilling space formed by excavating the pile body in the formation.

The section of the pile body 1 without grooves is a closed and complete pile, and the cross section of the pile body 1 can be set as a circle, ellipse or polygon. Here, the cross section of the pile body is circular as an example for illustration; the filling plate 2 The inner surface in contact with the pile body 1 is set as a plane that fits with the bottom surface of the groove, and the shape of the outer surface of the filling plate 2 is the same as that of the pile body 1 .

A number of supporting steel bars 3 are arranged in parallel at equal intervals along the axial direction in the pile body 1, and the supporting steel bars 3 run through the upper and lower ends of the pile body 1, and the supporting steel bars 3 are arranged in the pile body 1 at equal intervals; The sides are arranged in a straight line, and the distances between the supporting steel bars 3 away from the filling plate 2 and the outer surface of the pile body 1 are equal.

The support reinforcement bar 3 is provided with an inner hoop 4 perpendicular to the axis of the pile body 1 adjacent to the center of the pile body 1, there are at least three inner hoop hoops 4, and the spacing between multiple inner hoop hoops 4 is equal; The side of the steel bar 3 adjacent to the surface of the pile body 1 is provided with several outer hoop stirrups 5 perpendicular to the axial direction of the pile body 1. There are at least three outer hoop hoop stirrups 5, and the distance between the plurality of outer hoop hoop stirrups 5 is equal. .

There are at least three circumferential reinforcing bars 6 on the supporting steel bars 3. The circumferential reinforcing bars 6 are set on the three supporting bars 3 and have a triangular structure. Multiple circumferential reinforcing bars 6 The spacing between them is equal; the spacing and quantity of the inner hoop 4, outer hoop 5 and hoop reinforcement 6 along the axis of the pile body 1 should be determined according to the depth of the pile, formation water, earth pressure and other factors .

A pre-embedded steel bar 7 is installed through the pile body 1, and the pre-embedded steel bar 7 is arranged along a direction perpendicular to the axis of the pile body 1. The middle part of the pre-embedded steel bar 7 is parallel to the inner surface of the adjacent filling plate 2. The outside of the body 1; between the filling plate 2 and the pile body 1, there are also hoop iron wires 8, at least two hoop iron wires 8, the filling plate 2 is fixedly connected with the pile body 1 through the hoop iron wires 8, and the hoop iron wires 8 Pass through the supporting steel bar 3 on one side adjacent to the filling plate 2 and sleeve on the filling plate 2 .

The filling plate 2 is arranged in the groove outside the pile body 1, the length of the filling plate 2 along the axial direction of the pile body 1 is less than the total length of the pile body 1, and the thickness of the filling plate 2 is less than or equal to the height of the groove. The section length and thickness of the pile body 1 filled with the filling plate 2 can be determined according to the ground water and soil pressure that the pile bears and the main building in the foundation pit.

Below is the working principle of the utility model in the actual practical process:

In actual implementation, the supporting steel bar 3, the inner hoop hoop 4, the outer hoop hoop 5, the hoop reinforcing bar 6 and the pre-embedded steel bar 7 are arranged according to the size of the pile body 1, the cross-sectional shape, and the depth of the pile. and formation water, earth pressure, etc. are calculated and configured, and processed into a reinforcement cage. The position of the groove on the pile body determined according to the calculation is reserved on the reinforcement cage, and the supporting steel bar 3 is also adjusted accordingly according to the groove position. And fix the filler plate 2 to the supporting steel bars 3 arranged in a straight line at the groove part with the hoop iron wire 8, and at the same time bend the two ends of the embedded steel bar 7 out of the steel cage along the cross-sectional direction of the pile body 1 and make it Close to the filling plate 2, it is convenient to hoist the reinforcement cage into the drilled hole.

The specific position, length and thickness of the filler plate 2 provided on the groove portion of the reinforcement cage need to be determined through calculation according to the size, depth and condition of the foundation pit of the pile body 1 .

After the rock and soil in the surrounding retaining pile boreholes that meet the design depth around the foundation pit are excavated, the steel cage bound with the filling plate 2 is hoisted into the dug borehole. When hoisting the reinforcement cage, the side bound with the filling board 2 faces the foundation pit, while the side without the filling board 2 faces the outside of the foundation pit, and the reinforcement cage is positioned, and then the underwater concrete is poured into the drilled hole until The top of the pile, and the concrete in the pile body 1 is cured until it reaches the determined design strength.

Since part of the pile body 1 is filled by the filling board 2, the concrete cannot be poured in the area where the filling board 2 is located, so that there is no hardened concrete in the area where the pile body 1 is filled by the filling board, thereby forming an enclosure Incomplete enclosure piles for foundation pits.

When the retaining piles are poured and reach the designed concrete strength level, the rock and soil in the foundation pit can be excavated under the protection of the retaining piles until the bottom of the foundation pit reaches the determined design height, and the pile body 1 The position filled by the filling board 2 is exposed. At this moment, the enclosure pile with the filling plate 2 that has been poured can be exposed on the wall of the foundation pit.

Since some sections of the pile body 1 are filled by the filling board 2, before pouring the main structure in the foundation pit, the filling board 2 bound with the hoop iron wire 8 on the exposed pile body 1 can be removed, and after the filling board 2 is removed, the pile The corresponding area on the body 1 will vacate the vacant position corresponding to the pre-set groove, and straighten the pre-bent ends of the pre-embedded steel bar 7 so as to be connected with the steel bar of the main structure of the foundation pit. Part of the concrete of the underground main structure in the foundation pit can be poured at the vacant position, so that the pile and the main structure of the foundation pit can jointly bear formation pressure and groundwater pressure.

The above is a description of the specific implementation of the present utility model, so that those skilled in the art understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation, for those of ordinary skill in the art, As long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the utility model are included in the protection list.

Claims (10)

1. a kind of foundation pit enclosure stake, it is characterised in that including pile body (1), be provided through in the axial direction in the pile body (1) Some spacer bars (3), neighbouring pile body (1) central side of spacer bar (3) are provided perpendicular to the inner side ring of pile body (1) axis Stirrup (4), the side on neighbouring pile body (1) surface of spacer bar (3) are provided perpendicular to the outside ring stirrup of pile body (1) axis (5), at least it is arranged with ring stiffener (6) on three spacer bars (3)；Opened up in pile body (1) side wall it is fluted, in groove Provided with filling plate (2), the filling plate (2) is fixedly connected by ring iron wire (8) with pile body (1)；Through setting on pile body (1) There is embedded bar (7).

2. foundation pit enclosure stake according to claim 1, it is characterised in that circular in cross-section, the ellipse of the pile body (1) Shape or polygon.

3. foundation pit enclosure stake according to claim 1, it is characterised in that the plate (2) of filling is along pile body (1) axis direction Length be less than pile body (1) total length, filling plate (2) thickness be less than or equal to groove height.

4. foundation pit enclosure stake according to claim 3, it is characterised in that the inner side of the neighbouring pile body (1) of filling plate (2) Face is arranged to the plane being bonded with groove floor, and the shape of the lateral surface of filling plate (2) is identical with facial contour on the outside of pile body (1).

5. foundation pit enclosure stake according to claim 1, it is characterised in that spacer bar (3) spaced set is in stake In body (1)；The spacer bar (3) at neighbouring filling plate (2) place is arranged in a linear, spacer bar (3) and stake away from filling plate (2) The distance of body (1) outer surface is equal.

6. foundation pit enclosure stake according to claim 1, it is characterised in that the ring stiffener (6) at least provided with Three, ring stiffener (6) is sheathed on three spacer bars (3) and structure triangular in shape, multiple ring stiffeners (6) It is equal along the spacing of pile body (1) axis direction.

7. foundation pit enclosure stake according to claim 1, it is characterised in that the inner side ring stirrup (4) and outside ring Stirrup (5) at least three, the spacing between multiple inner side ring stirrups (4) is equal, between multiple outside ring stirrups (5) Spacing it is equal.

8. foundation pit enclosure stake according to claim 1, it is characterised in that the embedded bar (7) is perpendicular to pile body (1) axle Line, embedded bar (7) middle part is parallel with the medial surface of neighbouring filling plate (2), and the both ends of embedded bar (7) are located at pile body (1) outside Portion.

9. foundation pit enclosure stake according to claim 1, it is characterised in that the ring iron wire (8) passes through neighbouring filling plate (2) spacer bar (3) of side, and be sheathed on filling plate (2), at least two, ring iron wire (8).

10. foundation pit enclosure stake according to claim 1, it is characterised in that the filling plate (2) is cystosepiment.