Inclined pile supporting structure for external corner of foundation pit

Abstract

The utility model provides an inclined pile supporting structure of a foundation pit external corner, and relates to the technical field of foundation pit engineering, the inclined pile supporting structure comprises a fender post, an inclined pile rod, a coupling beam, an anchor cable and a reinforced concrete slab, the top end of the fender post is fixedly provided with a top beam, the surface of the top beam is fixedly provided with the coupling beam, the bottom end of the coupling beam is fixedly provided with the inclined pile rod, and the anchor cable is fixedly inserted in the surface of the coupling beam. And a reinforced concrete plate is fixedly mounted in the connecting beam. The inclined pile rods are located on the out-of-pit diagonal lines of the external corner of the foundation pit, the inclined pile rods, the connecting beams and the top beam of the foundation pit form a plurality of triangular stable systems, the overall rigidity is large, a favorable structural system is provided for restraining deformation of the external corner of the foundation pit, and the bearing capacity of the pile is improved through inclined arrangement; therefore, the strength and the rigidity of the foundation pit support structure at the external corner of the foundation pit are greatly improved, the anchor cables effectively transmit tensile force for resisting deformation of the foundation pit to a soil body far away from the external corner of the foundation pit, the rigidity of the support structure is further improved, and deformation of the support structure at the external corner of the foundation pit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a foundation pit engineering technical field especially relates to a foundation pit external corner's inclined pile support structure. BACKGROUND

[0002] In the complex special-shaped foundation pit, due to the constraint and limitation of topography, the foundation pit external corner is prone to appear, and the two sides of the foundation pit external corner are empty, which is often the weaker place of the foundation pit, the deformation of the support structure at the external corner is larger than that of the general position, especially if there is a nearby existing building at the foundation pit external corner, the foundation pit excavation needs to consider the protection of the surrounding adjacent building, and higher requirements are put forward for the deformation and stability of the enclosure structure at the external corner, therefore, the inclined pile support structure needs to be installed in the foundation pit external corner.

[0003] The defects of the traditional inclined pile support structure are that the overall rigidity and strength of the existing part of the inclined pile support structure are small, and the deformation of the foundation pit external corner is prone to occur in the actual use process, the surrounding soil is disturbed during the foundation pit excavation, and the stability of the overall foundation pit external corner is not high.

[0004] Therefore, an inclined pile support structure that can solve the above problems is needed. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at solving the defects in the prior art, solving the problem that the overall rigidity and strength of the existing part of the inclined pile support structure are small, and the stability of the overall foundation pit external corner is not high.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: an inclined pile support structure of a foundation pit external corner, which comprises a retaining pile, an inclined pile rod, a connecting beam, an anchor cable and a reinforced concrete slab, the top end of the retaining pile is fixedly installed with a corbel, the surface of the corbel is fixedly installed with the connecting beam, the bottom end of the connecting beam is fixedly installed with the inclined pile rod, the surface of the connecting beam is fixedly inserted with the anchor cable, and the inside of the connecting beam is fixedly installed with the reinforced concrete slab.

[0007] Preferably, the retaining pile and the corbel are connected through the connecting beam, the inclined pile rod is arranged on the outer diagonal line of the foundation pit external corner, the number of the inclined pile rods is three groups, the connecting beam is perpendicular to the diagonal line of the foundation pit, and two groups of connecting beams are arranged.

[0008] Preferably, the overall length of the inclined pile rod is not less than the overall length of the retaining pile, the overall pile diameter of the inclined pile rod is not less than the overall pile diameter of the retaining pile, and the included angle between the center line of the inclined pile rod and the plumb line ranges from ten to thirty degrees.

[0009] Preferably, the lower end of the inclined pile rod is inclined towards the inside of the foundation pit, the inclined pile rod bears pressure in the axial direction when in use, the top end of the inclined pile rod is fixedly connected with the bottom end of the coupling beam, the surface of the coupling beam is provided with a circular through hole, and the anchor cable is matched with the size of the circular through hole provided on the surface of the coupling beam.

[0010] Preferably, the anchor cable acts on the outermost coupling beam perpendicular to the diagonal line of the foundation pit corner, the anchor cable is made of high-strength prestressed steel strand as a raw material, and the anchor cable is prestressed and tensioned to reach the design value after the slurry strength in the hole reaches the requirement during construction.

[0011] Preferably, the reinforced concrete slab is located between the outermost two coupling beams perpendicular to the diagonal line of the foundation pit corner, and the coupling beam and the reinforced concrete slab are integrally poured and formed.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The inclined pile rod is located on the outside diagonal line of the foundation pit corner, the inclined pile rod, the coupling beam and the crown beam of the foundation pit form a plurality of triangular stable systems, the overall rigidity is large, and a favorable structural system is provided for restraining deformation at the foundation pit corner;

[0014] 2. The lower end of the inclined pile rod is inclined towards the inside of the foundation pit, the inclined pile rod bears pressure in the axial direction under the coupling effect of the deformation of the foundation pit, the reinforced concrete pile can bear large pressure but cannot bear large tension, the inclination improves the bearing capacity of the pile, and thus the strength and rigidity of the foundation pit enclosure structure at the foundation pit corner are greatly improved.

[0015] 3. A row of prestressed anchor cables are arranged on the outermost coupling beam perpendicular to the diagonal line of the foundation pit corner, the anchor cables effectively transmit the tension resisting the deformation of the foundation pit to the soil far away from the foundation pit corner, and thus the rigidity of the supporting structure is further improved, and the deformation of the supporting structure at the foundation pit corner is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A three-dimensional schematic view of the foundation pit corner supporting structure is shown Figure 1 ;

[0017] Figure 2 A perspective view of the foundation pit corner supporting structure is shown

[0018] Figure 3 A Figure 2 sectional view of AA in the figure is shown

[0019] Figure 4 A plan view of the foundation pit corner supporting structure is shown

[0020] Figure 5 A three-dimensional schematic view of the foundation pit corner supporting structure is shown Figure 2 ;

[0021] Figure 6 A three-dimensional schematic diagram of the external corner support of the hidden foundation pit retaining structure is shown;

[0022] Figure 7 A three-dimensional schematic diagram of the corner support structure of the foundation pit, showing the ground inside and outside the pit, is shown.

[0023] Legend:

[0024] 1. Retaining piles; 2. Crown beam; 3. Inclined piles; 4. Connecting beams; 5. Anchor cables; 6. Reinforced concrete slab. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0027] like Figures 1-7 As shown in the embodiment of this utility model: an inclined pile support structure for the external corner of a foundation pit includes retaining piles 1, inclined pile rods 3, connecting beams 4, anchor cables 5, and reinforced concrete slabs 6.

[0028] In specific operation, a capping beam 2 is fixedly installed at the top of the retaining pile 1, a connecting beam 4 is fixedly installed on the surface of the capping beam 2, an inclined pile rod 3 is fixedly installed at the bottom of the connecting beam 4, an anchor cable 5 is fixedly inserted on the surface of the connecting beam 4, and a reinforced concrete slab 6 is fixedly installed inside the connecting beam 4.

[0029] The retaining piles 1 and the capping beam 2 are connected by a connecting beam 4. The inclined piles 3 are set on the diagonal outside the pit at the external corner of the pit. There are three sets of inclined piles 3. The connecting beam 4 is perpendicular to the diagonal of the pit and there are two sets of connecting beams 4. The connecting beam 4 is set away from the external corner of the pit.

[0030] By using the above technical solution, and by setting the inclined pile 3 on the diagonal line of the foundation pit, the mutual influence between the construction of the retaining pile 1 and the inclined pile 3 can be reduced, thus reducing disturbance and achieving maximum protection for the soil outside the pit.

[0031] The overall length of the inclined pile 3 shall not be less than the overall length of the retaining pile 1, the overall diameter of the inclined pile 3 shall not be less than the overall diameter of the retaining pile 1, and the angle between the center line of the inclined pile 3 and the plumb line shall be between 10 and 30 degrees.

[0032] Through the technical scheme, the number of the inclined pile 3 is less, so the comprehensive cost can be saved, and the construction machinery and the construction method have been reported in the known technology, and the construction of the inclined pile 3 is relatively mature.

[0033] The lower end of the inclined pile 3 is inclined towards the inside of the foundation pit, the axial direction of the inclined pile 3 bears pressure in use, the top end of the inclined pile 3 is fixedly connected with the bottom end of the beam 4, and the surface of the beam 4 is provided with a circular through hole.

[0034] Through the technical scheme, the reinforced concrete pile can bear larger pressure but cannot bear larger tension, the inclined arrangement effectively utilizes the compressive strength of the reinforced concrete pile body, improves the pile foundation bearing capacity, and further greatly improves the strength and rigidity of the foundation pit support structure at the foundation pit external corner.

[0035] The anchor cable 5 acts on the outermost beam 4 perpendicular to the diagonal line of the foundation pit external corner, the anchor cable 5 is made of high-strength prestressed steel strand as a raw material, and the anchor cable 5 is prestressed and tensioned to reach the design value after the hole slurry strength reaches the requirement in construction.

[0036] Through the technical scheme, the prestressed anchor cable 5 can effectively constrain the deformation of the support structure, effectively transmit the tensile force resisting the deformation of the foundation pit to the soil far away from the foundation pit external corner, and further improve the rigidity of the support structure and reduce the deformation of the support structure at the foundation pit external corner.

[0037] The reinforced concrete slab 6 is located between the outermost two beams 4 perpendicular to the diagonal line of the foundation pit external corner, and the beam 2, the beam 4 and the reinforced concrete slab 6 are integrally poured and formed.

[0038] Through the technical scheme, the reinforced concrete slab 6 is used to connect the beams 4 to form a whole, the rigidity of the support structure is further improved, the reinforced concrete slab 6 is constructed on the ground, so the construction is convenient and cost-effective, the beam 4 has a certain height, and the reinforced concrete slab 6 is arranged along the bottom of the beam 4, so that the upper space of the beam 4 is not occupied.

[0039] In summary, the working principle of the utility model is as follows: when it is needed to reinforce the base pit external corner by using the batter pile supporting structure, the base pit supporting structure is designed as a whole according to the engineering geological conditions, the surrounding environment and the base pit parameters, wherein the supporting design at the base pit external corner is included, the supporting design at the base pit external corner includes the batter pile 3, the connecting beam 4, the anchor cable 5 and the reinforced concrete slab 6 in addition to the enclosure pile 1 and the corbel 2, the design includes the size, the position, the reinforcement, the mutual lapping requirement and the like of each component, when the enclosure pile 1 at the base pit external corner is constructed, the batter pile 3 at the position is constructed synchronously or within a short time interval, according to the position of the anchor cable 5 in the design scheme, the anchor hole is measured and placed, the hole is drilled, the steel strand is placed and the grouting construction is carried out, the main body of the anchor cable 5 is formed, the matching protection sleeve is arranged at the joint position of the anchor cable 5 and the connecting beam 4 to temporarily protect the head of the anchor cable 5, according to the design scheme, when the corbel 2, the connecting beam 4 and the reinforced concrete slab 6 are constructed, the steel bars between the top of the batter pile 3, the connecting beam 4, the reinforced concrete slab 6, the top of the enclosure pile 1 and the corbel 2 should be effectively connected, the relevant lapping should meet the relevant regulations, the protection sleeve of the anchor cable 5 is inserted into the steel cage of the outermost connecting beam 4, the connecting beam 4, the reinforced concrete slab 6 and the corbel 2 are integrally poured and formed, after the strength of the connecting beam 4 reaches the design strength, the anchor device of the connecting beam 4 and the head of the anchor cable 5 is installed, the anchor device and the anchor are fixed by clamping with the fastener, the pre-stressed steel strand of the anchor cable 5 is tensioned by using the tensioning equipment, the total tension reaches the design requirement, the construction of the anchor cable 5 is carried out according to the relevant regulations. After the supporting structure is constructed, the subsequent layering, slicing and zoned excavation of the base pit can be carried out.

[0040] The above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms, any skilled person in the art can change or modify the above disclosed technical content into equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the technical scheme content of the utility model still belongs to the protection scope of the technical scheme of the utility model.

Claims

1. A batter pile support structure of a foundation pit external corner, comprising a retaining pile, a batter pile rod, a coupling beam, an anchor cable and a reinforced concrete slab, characterized in that: The top end of the fender pile is fixedly installed with a crown beam, the surface of the crown beam is fixedly installed with a connecting beam, the bottom end of the connecting beam is fixedly installed with an inclined pile rod, the surface of the connecting beam is fixedly inserted with an anchor cable, and the inside of the connecting beam is fixedly installed with a reinforced concrete plate. The fender pile and the crown beam are connected through the connecting beam, the inclined pile rod is arranged on the outside diagonal line of the pit corner, the number of the inclined pile rod is three groups, the connecting beam is perpendicular to the diagonal line of the pit, and the connecting beam is provided with two groups. The overall length of the inclined pile rod is not less than the overall length of the fender pile, the overall pile diameter of the inclined pile rod is not less than the overall pile diameter of the fender pile, and the included angle between the center line of the inclined pile rod and the plumb line is 10-30 degrees.

2. The batter pile support structure for a corner of a foundation pit according to claim 1, characterized in that: The lower end of the inclined pile rod is inclined towards the inside of the pit, the axial direction of the inclined pile rod bears pressure during use, the top end of the inclined pile rod is fixedly connected with the bottom end of the connecting beam, the surface of the connecting beam is provided with a circular through hole, and the anchor cable is matched with the size of the circular through hole provided on the surface of the connecting beam.

3. The batter pile support structure for a corner of an excavation of claim 1, wherein: The anchor cable acts on the outermost connecting beam perpendicular to the diagonal line of the pit corner, the anchor cable is made of high-strength prestressed steel wire, and the slurry strength in the hole reaches the requirement during construction, and then the prestressed tension is carried out to reach the design value.

4. The batter pile support structure for a corner of an excavation of claim 1, wherein: The reinforced concrete plate is located between the two outermost connecting beams perpendicular to the diagonal line of the pit corner, and the crown beam, the connecting beam and the reinforced concrete plate are integrally poured and formed.

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