CN211922637U

CN211922637U - A-shaped double-row pile foundation pit support with inter-pile inclined struts

Info

Publication number: CN211922637U
Application number: CN202020094847.1U
Authority: CN
Inventors: 聂东清; 周质炎; 翟之阳; 王刚
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-11-13
Anticipated expiration: 2030-01-16

Abstract

The utility model discloses an A-shaped double-row pile foundation pit support with inter-pile diagonal braces, which comprises a front row of piles and a rear row of piles, and is characterized in that the front row of piles are inclined to enter a soil body, and pile heads point to the inside of the foundation pit; the rear row of piles are vertically arranged, or the pile heads are obliquely arranged in the direction pointing to the outside of the pit; the pile tops of the front row of piles and the pile tops of the rear row of piles are connected through the crown beams, the purlins are constructed by the rear row of piles facing one side in the foundation pit, and the inter-pile diagonal braces are arranged between the purlins and the front row of piles. The utility model has the advantages that, compare general double row pile and have higher bulk rigidity, anti side ability of moving is stronger. Can be used as a supporting structure of a foundation pit with larger excavation depth.

Description

A-shaped double-row pile foundation pit support with inter-pile inclined struts

Technical Field

The utility model belongs to the technical field of the building foundation ditch, concretely relates to set up A style of calligraphy double row pile foundation ditch support of bracing between stake.

Background

The row pile support is a common support form in the current foundation pit engineering. The double-row pile support is a portal foundation pit support structure formed by arranging piles in two rows, namely front and rear rows, and connecting pile top crown beams of the front and rear rows by using connecting beams. Compared with the row piles, the double-row piles have higher bending strength and lateral displacement resistance and can be applied to foundation pits with larger excavation depth. However, the double-row piles applied at present are basically vertical piles, and the defects are obvious. Firstly, the deformation mode of the double-row piles is still close to a cantilever support mode, when the excavation depth is large, the pile top displacement is large, and the soil body outside the pit is large in settlement. Secondly, the double-row pile comprises a front row of piles, a rear row of piles, a front row of crown beams, a rear row of crown beams, a connecting beam and the like, and in order to improve the integrity of the double-row pile, the soil body between the front row of piles and the rear row of piles needs to be reinforced, so that the overall cost of the double-row pile is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a set up A style of calligraphy double row pile excavation supporting of bracing between stake according to the weak point of above-mentioned prior art, compare general double row pile and have higher bulk rigidity, the anti side ability of moving is stronger. Can be used as a supporting structure of a foundation pit with larger excavation depth.

In order to achieve the above purpose, the technical solution of the present invention is as follows: a-shaped double-row pile foundation pit support with inter-pile diagonal braces comprises front row piles and rear row piles, and is characterized in that the front row piles are inclined to enter a soil body, and pile heads point to the inside of a foundation pit; the rear row of piles are vertically arranged, or the pile heads are obliquely arranged in the direction pointing to the outside of the pit; the pile tops of the front row of piles and the pile tops of the rear row of piles are connected through the crown beams, the purlins are constructed by the rear row of piles facing one side in the foundation pit, and the inter-pile diagonal braces are arranged between the purlins and the front row of piles.

Furthermore, the front row of piles are reinforced concrete piles, the included angle between the pile body of the front row of piles and the vertical direction is 10-60 degrees, the rear row of piles are reinforced concrete piles, the front row of piles and the vertical direction are arranged vertically or obliquely, and the front row of piles and the vertical direction are arranged obliquely at included angles of 5-30 degrees.

Further, the front row of piles are cast-in-place piles, precast piles, long spiral drilled piles, high-pressure jet grouting piles or stiff composite piles.

Further, the pile spacing of the front row of piles is 2-6 m.

Furthermore, the pile body of the front row of piles and the purlin of the rear row of piles are respectively provided with embedded steel plates or reserved steel bars, so that the piles are connected through inclined struts.

In addition, when the front row of piles bear larger axial load, a bottom expanding method can be adopted, the bearing capacity of the front row of piles is improved, and deformation is reduced.

Further, the crown beam is a reinforced concrete beam.

Furthermore, the top of the rear row of piles is provided with a crown beam, the joint of the top of the front row of piles and the top of the rear row of piles is provided with a raised head connected with the front row of piles, or the width of the crown beam is larger than the sum of the diameters of the front row of piles and the rear row of piles.

Further, the horizontal supports among the piles are reinforced concrete supports or steel supports.

The inter-pile inclined strut is a reinforced concrete strut or a steel strut. When the inter-pile diagonal brace is supported by reinforced concrete, reinforcing steel bars are reserved at corresponding positions of the pile bodies of the front row of piles and the enclosing purlins of the rear row of piles, so that the connection between the pile bodies of the front row of piles and the enclosing purlins of the rear row of piles is facilitated; when the connecting beam is a steel beam, the corresponding position of the pile body of the front row of piles and the surrounding purlin of the rear row of piles are embedded with steel plates in advance, so that the connecting beam is conveniently connected with the inclined struts among the piles. The inclined strut between the piles forms an included angle with the groundβThe setting value is generally consistent with the value of the inclination angle a of the front row of piles in the vertical direction. The inclined struts between the piles can be arranged for 1-3 times according to different requirements of foundation pit excavation depth and deformation control.

Enclosing purlins between the connecting beams and the rear row piles are generally reinforced concrete enclosing purlins, so that the inclined struts between the piles are connected with the rear row piles conveniently.

The utility model discloses a set up the crown beam, enclose bracing between purlin and stake, form the double row pile structure of the similar A style of calligraphy of section, the bulk rigidity is high, and anti side is moved the ability reinforce. And a horizontal inner support structure is not arranged in the foundation pit, so that the earthwork excavation and the underground structure construction are facilitated, and the construction cost is reduced.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

fig. 3 is a view illustrating a crown beam according to an embodiment of the present invention;

FIG. 4 is a view showing a crown beam according to another embodiment of the present invention;

fig. 5 is the utility model discloses a pre-buried steel sheet schematic diagram of front row pile shaft.

The figure includes: the pile comprises front row piles 1, rear row piles 2, crown beams 3, inter-pile diagonal braces 4, surrounding purlins 5, front row pile expanded bottoms 6, pre-buried steel plates 7, longitudinal steel bars 8 in piles and stirrups 9.

Detailed Description

The following describes the embodiments of the present invention with reference to the drawings.

Fig. 1 and 2 are schematic structural diagrams of the present invention. The A-shaped double-row pile with the inter-pile diagonal braces comprises a front row of piles 1, a rear row of piles 2, a crown beam 3, the inter-pile diagonal braces 4 and surrounding purlins 5, and when necessary, the pile bottom of the front row of piles can be expanded to form a front row of pile expanded bottom 6. It should be noted that the row piles near the inside of the foundation pit are called front row piles, and the row piles near the outside of the foundation pit are called rear row piles 2. The pile head of the front row of piles 1 points to the inside of the foundation pit and enters the soil body at an included angle a with the vertical direction, and the value of a is 10-60 degrees. The rear row of piles 2 vertically enter the soil body. And a crown beam 3 is constructed at the tops of the front row of piles and the rear row of piles, so that the tops of the front row of piles 1 and the rear row of piles 2 are reliably connected. The form of the crown beam 3 can be two types, as shown in fig. 3, the form of the crown beam is that the crown beam is arranged at the top of the rear row of piles 2, and a raised head is arranged at the joint of the top of the front row of piles 1 and the top of the rear row of piles 2 to be connected with the front row of piles 1; as shown in fig. 4, the form of the crown beam is that the crown beam with the width larger than the sum of the diameters of the front row piles 1 and the rear row piles 2 is adopted, and a convex head is not needed. The foundation pit is excavated to the depth of the inter-pile diagonal brace 4, soil between the front row of piles 1 and the rear row of piles 2 is excavated, and the enclosing purlin 5 and the inter-pile diagonal brace 4 are constructed on one side, facing the inside of the foundation pit, of the front row of piles 1.

According to the utility model discloses an other embodiments, back row pile also can incline to arrange, and when the slope was arranged, it was 5 ~30 contained angle slope arrangement to be with vertical direction.

The inter-pile inclined strut is a reinforced concrete strut or a steel strut. When the inter-pile diagonal brace is supported by reinforced concrete, reinforcing steel bars are reserved at corresponding positions of the pile bodies of the front row of piles and the enclosing purlins of the rear row of piles, so that the connection between the pile bodies of the front row of piles and the enclosing purlins of the rear row of piles is facilitated; when the connecting beam is a steel beam, the corresponding position of the pile body of the front row of piles and the surrounding purlin of the rear row of piles are embedded with steel plates, so that the front row of piles and the surrounding purlin of the rear row of piles can be conveniently connected with the inclined struts between the piles and the pilesThe means may be welding or bolting. The inclined strut between the piles forms an included angle with the groundβAnd setting, generally consistent with the inclination angle a of the front row pile. The inclined struts between the piles can be arranged for 1-3 times according to different requirements of foundation pit excavation depth and deformation control.

The utility model discloses implement and can go on according to following step:

(1) the front row of piles 1 are placed into the soil body at an inclination angle a, and if the front row of piles 1 are cast-in-situ bored piles, high-pressure jet grouting piles and the like, the bottom expanding 6 can be carried out according to the needs. A steel plate 7 is embedded in the pile body before the front row of piles 1 are placed in the soil body;

(2) vertically placing the rear row of piles 2 into a soil body;

(3) constructing the crown beam 3, and selecting the form shown in figure 3 or the form shown in figure 4 according to calculation requirements;

(4) excavating a foundation pit to the bottoms of the inter-pile inclined struts 4 and the surrounding purlins 5;

(5) constructing an enclosing purlin 5 and an inter-pile diagonal brace 4;

(6) and (5) repeating the steps (4) and (5) until the bottom of the foundation pit is excavated if a plurality of connecting beams are arranged (shown in figure 4).

Claims

1. A-shaped double-row pile foundation pit support with inter-pile diagonal braces comprises front row piles and rear row piles, and is characterized in that the front row piles are inclined to enter a soil body, and pile heads point to the inside of a foundation pit; the rear row of piles are vertically arranged, or the pile heads are obliquely arranged in the direction pointing to the outside of the pit; the pile tops of the front row of piles and the pile tops of the rear row of piles are connected through the crown beams, the purlins are constructed by the rear row of piles facing one side in the foundation pit, and the inter-pile diagonal braces are arranged between the purlins and the front row of piles.

2. The double row pile foundation pit support of claim 1, wherein the front row piles are reinforced concrete piles, the included angle between the pile bodies of the front row piles and the vertical direction is 10-60 degrees, the rear row piles are reinforced concrete piles, the rear row piles are arranged vertically or obliquely, and the rear row piles are arranged obliquely with the vertical direction at an included angle of 5-30 degrees.

3. The double row pile foundation pit support of claim 1, wherein the front row pile is a bored pile, a precast pile, a long spiral bored pile, a high pressure jet grouting pile, or a stiff composite pile.

4. The double row pile foundation pit support of claim 1, wherein the pile pitch of the front row piles is 2-6 m.

5. The double-row pile foundation pit support of claim 1, wherein the pile bodies of the front row of piles and the purlin of the rear row of piles are respectively provided with embedded steel plates or reserved steel bars so as to facilitate the connection of the diagonal braces between the piles.

6. The double row pile foundation pit support of claim 1, wherein the crown beam is a reinforced concrete beam.

7. The double row pile foundation pit support of claim 6, wherein a top beam is provided at the top of the rear row pile, a raised head is provided at the joint of the top of the front row pile and the top of the rear row pile to connect with the front row pile, or the width of the top beam is larger than the sum of the diameters of the front row pile and the rear row pile.

8. The double row pile foundation pit support of claim 1, wherein the horizontal inter-pile supports are reinforced concrete supports or steel supports.