A deep foundation pit support structure

Abstract

The present invention discloses a deep foundation pit support structure, comprising: an anchor mechanism; an anchoring mechanism; a steel mesh; a group of arc-shaped bottom plates, the bottom surfaces of which are respectively abutted against the bottoms of the transverse anchor holes on both sides of the limiting holes; a pulling mechanism, comprising a fixed wedge fixedly welded to the inner side of the anchor steel bar, between two adjacent fixed wedges, the outer end of the upper fixed wedge is arranged inside the outer end of the lower fixed wedge, so that the top-tightening wedge will not push the fixed wedges one by one as a whole during the downward process, ensuring that the top-tightening wedge can form an inward tightening on the corresponding fixed wedges respectively, so as to pull and press the steel mesh as a whole on the surface of the foundation pit slope, so as to greatly improve the overall structural stability. The present invention can effectively improve the support effect of the deep foundation pit slope, effectively ensure the stability of the deep foundation pit slope; and can effectively adapt to the influence of the vibration caused by the construction, and further prevent the collapse of the foundation pit slope with poor soil quality.

Description

Technical Field

[0001] The invention relates to the technical field of supporting structures for foundation pit construction, and in particular to a deep foundation pit supporting structure, which is mainly used to ensure the stability of a deep foundation pit slope. Background Art

[0002] Deep foundation pit support refers to the measures of support, reinforcement and protection of the side walls of deep foundation pits and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. At present, the commonly used support structures for deep foundation pits mainly include underground continuous walls, channel steel sheet piles, pile rows, anchor support, soil nail walls, etc.

[0003] Among them, the advantages of soil nail wall are stability, reliability, simple construction, short construction period, good effect and good economy, so it has been widely used in areas with good soil quality. However, its use is limited by soil conditions and it is difficult to apply in areas with poor soil quality. In order to break through the application scope of soil nail wall, many construction parties have begun to improve the traditional soil nail wall structure and its construction method, such as by setting longitudinal fixed piles to form longitudinal limit for the anchor steel bars arranged side by side, so as to improve the overall stability of the soil nail wall. However, due to the insufficient combination of fixed piles and anchor steel bars, the stability improvement effect is extremely limited; and under the influence of external construction, the vibration caused by construction is easy to be transmitted in the soil nail wall structure, which leads to the collapse of slopes with poor soil quality. Therefore, soil nail wall with simple construction, short construction period and good economy is still difficult to be applied in areas with poor soil quality.

[0004] Therefore, the purpose of this invention is to design a deep foundation pit support structure that can effectively improve the support effect of deep foundation pit slopes, thereby effectively ensuring the stability of deep foundation pit slopes; and can effectively adapt to the influence of vibration caused by construction, thereby further preventing the collapse of foundation pit slopes with poor soil quality. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a deep foundation pit supporting structure, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is:

[0007] A deep foundation pit support structure, comprising:

[0008] The anchoring mechanism comprises transverse anchoring holes drilled side by side on the foundation pit slope in accordance with height, wherein corresponding anchoring steel bars are respectively inserted into the transverse anchoring holes;

[0009] The anchor mechanism comprises limiting holes arranged side by side longitudinally in the rock and soil body on the inner side of the foundation pit slope, the aperture of the limiting holes is smaller than the aperture of the transverse anchor holes, and the limiting holes pass through the middle of the transverse anchor holes in the same row, the limiting holes are respectively fixedly inserted with corresponding anchor rods, and the middle of the anchor rods is provided with a clamping groove for clamping the anchor steel bar;

[0010] A steel mesh is covered on the foundation pit slope, and the steel mesh is fixedly welded to the outer ends of the anchor steel bars;

[0011] A group of arc bottom plates are fixed to the bottom of the anchoring steel bars at intervals through corresponding connecting rods, and the bottom surfaces of the group of arc bottom plates are respectively abutted against the bottoms of the transverse anchoring holes on both sides of the limiting holes;

[0012] The pulling mechanism includes a fixed wedge block fixedly welded to the inner side of the anchor steel bar, and a guide hole matched with the clamping groove of the anchor rod is provided in the middle part of the fixed wedge block; between two adjacent fixed wedge blocks above and below, the outer end portion of the fixed wedge block located at the upper part is arranged on the inner side of the outer end portion of the fixed wedge block located at the lower part, and the outer side surface of the fixed wedge block is arranged in an inclined surface shape; a tightening wedge block matched with the fixed wedge block is fixedly welded on the anchor rod, and in the process of the anchor rod being inserted downward into the limiting hole, the tightening wedge blocks respectively form inward tightening on the fixed wedge blocks to drive the anchor steel bar to anchor the steel mesh inward; after the anchor rod is inserted into place, cement slurry is filled into the transverse anchor hole by pressurization.

[0013] The foundation pit slope is covered with a corresponding concrete layer.

[0014] The outer end of the anchor steel bar extends to the outside of the concrete layer and is fixedly connected with a layer of isolation steel mesh spaced apart from the concrete layer.

[0015] A corresponding polymer damping material layer is laid between the isolation steel mesh and the concrete layer.

[0016] The tightening wedge block has a plurality of corresponding abutting balls rollingly mounted on a side surface opposite to the fixed wedge block, and the ends of the abutting balls respectively roll and abut against the end surface of the fixed wedge block.

[0017] The rear ends of a group of arc-shaped bottom plates are folded upwards and provided with guide protrusions.

[0018] A guide groove for guiding the abutting ball is arranged on the end surface of the fixed wedge, and the upper end portions of the guide groove are respectively arranged in an open shape.

[0019] The outer end of the anchor rod abuts against the outer end of the limiting hole.

[0020] The space between the anchor rod and the limiting hole is pressurized and filled with corresponding cement slurry.

[0021] Advantages of the present invention:

[0022] 1) The present invention uses a group of arc bottom plates to lift the corresponding position of the anchoring steel bar, so that when the anchor rod is inserted into the limiting hole downward, that is, when the top wedge blocks the fixed wedge, the anchoring steel bar will not be directly embedded in the bottom of the transverse anchoring hole, thereby ensuring that the top wedge can smoothly block the fixed wedge in the downward process; on this basis, the present invention further sets the outer end of the fixed wedge located at the upper part to the inner side of the outer end of the fixed wedge located at the lower part, so that the top wedge will not push the fixed wedge one by one in the downward process, thereby ensuring that the top wedge can form an inward push on the corresponding fixed wedge respectively, thereby pulling and pressing the steel mesh as a whole on the surface of the foundation pit slope, so as to greatly improve the overall structural stability of the present invention; and the present invention can significantly improve the connection effect between the anchor rod and the anchoring steel bar by clamping the clamping groove and the wedge pushing cooperation. Thereby effectively improving the support effect of the deep foundation pit slope, so as to effectively ensure the stability of the deep foundation pit slope.

[0023] 2) The foundation pit slope of the present invention is covered with a corresponding concrete layer, the outer end of the anchor steel bar extends to the outside of the concrete layer, and is fixedly connected to a layer of isolation steel mesh spaced apart from the concrete layer. Under the action of the concrete layer and the isolation steel mesh, the integrity of the present invention is effectively improved to further improve the support effect on the foundation pit slope; the most important thing is that a corresponding polymer damping material layer is laid between the isolation steel mesh and the concrete layer. The polymer damping material layer firmly laid through the interlayer effectively isolates and eliminates the vibration caused by the construction, thereby further preventing the foundation pit slope with poor soil quality from collapsing due to the transmission of construction vibration.

[0024] 3) The tightening wedge block of the present invention is rollingly installed with an abutment ball on the side surface opposite to the fixed wedge block, thereby reducing the friction force of the tightening wedge block when pushing the fixed wedge block, thereby improving the construction convenience of the present invention; on this basis, the present invention further folds upwards at the rear end portions of a group of arc-shaped bottom plates to form a guide convex edge, thereby forming a lifting effect during the inward movement of the fixed wedge block and the anchoring steel bar, thereby further preventing the position of the anchoring steel bar from excessively collapsing, thereby effectively and reasonably controlling the height of the anchoring steel bar; and a guide groove for guiding the abutment ball is provided on the end surface of the fixed wedge block of the present invention, and under the action of the guide groove, a lateral limit is formed on the abutment ball, thereby effectively and reasonably controlling the lateral position of the anchoring steel bar, thereby ensuring that the insertion position of the anchoring steel bar is not excessively offset, thereby ensuring the practical effect of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure when cement slurry is poured in the transverse anchoring holes and the limiting holes of the present invention.

[0027] Figure 3 for Figure 2 A partial enlarged view of part A in .

[0028] Figure 4 for Figure 2 A partial enlarged view of part B in FIG.

[0029] In the accompanying drawings: anchoring mechanism 1, transverse anchoring hole 101, anchoring steel bar 102, foundation pit slope 2, anchoring mechanism 3, limiting hole 301, anchoring rod 302, steel mesh 4, pulling mechanism 5, fixed wedge 501, top wedge 502, arc bottom plate 6, guide convex edge 601, connecting rod 7, abutting sphere 8, concrete layer 9, isolation steel mesh 10, polymer damping material layer 11. DETAILED DESCRIPTION

[0030] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments in conjunction with the accompanying drawings:

[0031] refer to Figure 1-4 , a deep foundation pit support structure, comprising:

[0032] The anchoring mechanism 1 comprises transverse anchoring holes 101 drilled side by side on the foundation pit slope 2 in accordance with height, and corresponding anchoring steel bars 102 are respectively inserted into the transverse anchoring holes 101;

[0033] The anchor mechanism 3 comprises limiting holes 301 longitudinally arranged side by side in the rock and soil body on the inner side of the foundation pit slope 2, the aperture of the limiting holes 301 is smaller than the aperture of the transverse anchor holes 101, and the limiting holes 301 pass through the middle of the transverse anchor holes 101 in the same row, and corresponding anchor rods 302 are fixedly inserted in the limiting holes 301, and the middle of the anchor rods 302 is provided with a clamping groove for clamping the anchor steel bar 102;

[0034] A steel mesh 4 is covered on the foundation pit slope 2, and the steel mesh 4 is fixedly welded to the outer ends of the anchor steel bars 102;

[0035] A group of arc bottom plates 6 are fixed to the bottom of the anchoring steel bars 102 at intervals through corresponding connecting rods 7, and the bottom surfaces of the group of arc bottom plates 6 are respectively abutted against the bottoms of the transverse anchoring holes 101 on both sides of the limiting hole 301;

[0036] The pulling mechanism 5 includes a fixed wedge 501 fixedly welded to the inner side of the anchor steel bar 102, and a guide hole matched with the clamping groove of the anchor rod 302 is provided in the middle of the fixed wedge 501; between two adjacent fixed wedges 501 above and below, the outer end of the fixed wedge 501 located at the upper part is arranged on the inner side of the outer end of the fixed wedge 501 located at the lower part, and the outer side surface of the fixed wedge 501 is arranged in an inclined surface shape; a tightening wedge 502 matched with the fixed wedge 501 is fixedly welded on the anchor rod 302, and when the anchor rod 302 is inserted downward into the limiting hole 301, the tightening wedge 502 respectively tightens the fixed wedge 501 inwardly to drive the anchor steel bar 102 to anchor the steel mesh 4 inwardly; after the anchor rod 302 is inserted into place, cement slurry is filled into the transverse anchor hole 101 by pressurization.

[0037] By intervening a group of arc-shaped bottom plates 6, the corresponding positions of the anchoring steel bars 102 are lifted, so that when the anchoring rod 302 is inserted downward into the limiting hole 301, that is, when the tightening wedge block 502 pushes the fixed wedge block 501, the anchoring steel bars 102 will not be directly embedded in the bottom of the transverse anchoring hole 101, thereby ensuring that the tightening wedge block 502 can smoothly push the fixed wedge block 501 in the downward process; on this basis, the present invention further sets the outer end of the fixed wedge block 501 located at the upper portion The inner side of the outer end of the fixed wedge 501 at the bottom prevents the tightening wedge 502 from pushing the fixed wedge 501 one by one as a whole during the downward process, thereby ensuring that the tightening wedge 502 can respectively press the corresponding fixed wedge 501 inward, thereby pulling and pressing the steel mesh 4 as a whole on the surface of the foundation pit slope 2, so as to greatly improve the overall structural stability of the present invention; and the present invention can significantly improve the connection effect between the anchor rod 302 and the anchor steel bar 102 through the clamping groove clamping and the wedge pushing cooperation. Thereby effectively improving the support effect of the deep foundation pit slope, so as to effectively ensure the stability of the deep foundation pit slope.

[0038] The foundation pit slope 2 is covered with a corresponding concrete layer 9. The outer end of the anchoring steel bar 102 extends to the outside of the concrete layer 9 and is fixed with a layer of isolation steel mesh 10 spaced apart from the concrete layer 9. A corresponding polymer damping material layer 11 is laid between the isolation steel mesh 10 and the concrete layer 9.

[0039] The foundation pit slope 2 of the present invention is covered with a corresponding concrete layer 9, the outer end of the anchor steel bar 102 extends to the outside of the concrete layer 9, and is fixedly connected to an isolation steel mesh 10 spaced apart from the concrete layer 9. Under the action of the concrete layer 9 and the isolation steel mesh 10, the integrity of the present invention is effectively improved to further improve the support effect on the foundation pit slope 2; the most important thing is that a corresponding polymer damping material layer 11 is laid between the isolation steel mesh 10 and the concrete layer 9. The polymer damping material layer 11 firmly laid through the interlayer effectively isolates and eliminates the vibration caused by the construction, thereby further preventing the foundation pit slope with poor soil quality from collapsing due to the transmission of construction vibration.

[0040] The tightening wedge 502 has a plurality of corresponding abutting balls 8 rollingly mounted on a side surface opposite to the fixed wedge 501, and the ends of the abutting balls 8 respectively roll and abut against the end surface of the fixed wedge 501. A group of the rear ends of the arc bottom plates 6 are respectively folded upwards and provided with guide convex edges 601. The end surface of the fixed wedge 501 is provided with a guide groove for guiding the abutting balls 8, and the upper ends of the guide grooves are respectively provided in an open shape.

[0041] By setting the abutment ball 8, the friction force of the tightening wedge block 502 when pushing the fixed wedge block 501 can be reduced, so as to improve the construction convenience of the present invention; on this basis, the present invention further provides a guide ridge 601 which is folded upward at the rear end portion of a group of arc-shaped bottom plates 6, thereby forming a lifting effect during the inward movement of the fixed wedge block 501 and the anchoring steel bar 102, so as to further prevent the position of the anchoring steel bar 102 from excessively collapsing, thereby effectively and reasonably controlling the height of the anchoring steel bar 102; and a guide groove for guiding the abutment ball is provided on the end face of the fixed wedge block 501 of the present invention, and under the action of the guide groove, a lateral limit is formed on the abutment ball 8, thereby effectively and reasonably controlling the lateral position of the anchoring steel bar 102, so as to ensure that the insertion position of the anchoring steel bar 102 is not excessively offset, so as to ensure the practical effect of the invention.

[0042] The outer end of the anchor rod 302 abuts against the outer end of the limiting hole 301. The gap between the anchor rod 302 and the limiting hole 301 is filled with corresponding cement slurry under pressure.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A deep foundation pit support structure, characterized in that: include: The anchoring mechanism (1) comprises transverse anchoring holes (101) drilled side by side in height on the foundation pit slope (2), wherein corresponding anchoring steel bars (102) are respectively inserted into the transverse anchoring holes (101); The anchoring mechanism (3) comprises limiting holes (301) arranged side by side longitudinally in the rock and soil body inside the foundation pit slope (2), the aperture of the limiting holes (301) being smaller than the aperture of the transverse anchoring holes (101), and the limiting holes (301) passing through the middle of the transverse anchoring holes (101) in the same row, the limiting holes (301) respectively having corresponding anchoring rods (302) fixedly inserted therein, and the middle of the anchoring rods (302) being provided with a clamping groove for clamping the anchoring steel bars (102); A steel mesh (4) covering the foundation pit slope (2), the steel mesh (4) being respectively fixedly welded to the outer ends of the anchor steel bars (102); A group of arc-shaped bottom plates (6) are fixedly connected to the bottom of the anchoring steel bars (102) at intervals through corresponding connecting rods (7), and the bottom surfaces of the group of arc-shaped bottom plates (6) are respectively abutted against the bottoms of the transverse anchoring holes (101) on both sides of the limiting hole (301); The pulling mechanism (5) comprises a fixed wedge (501) fixedly welded to the inner side of the anchoring steel bar (102), wherein the middle part of the fixed wedge (501) is provided with a guide hole adapted to the clamping groove of the anchoring rod (302); between two adjacent fixed wedges (501) above and below, the outer end of the upper fixed wedge (501) is arranged inside the outer end of the lower fixed wedge (501), and the outer side surface of the fixed wedge (501) is arranged in an inclined shape; the anchoring rod (302) is provided with a guide hole adapted to the clamping groove of the anchoring rod (302); between two adjacent fixed wedges (501) above and below, the outer end of the upper fixed wedge (501) is arranged inside the outer end of the lower fixed wedge (501), and the outer side surface of the fixed wedge (501) is arranged in an inclined shape; 2) A tightening wedge block (502) matched with the fixed wedge block (501) is fixedly welded on the top, and when the anchor rod (302) is inserted downward into the limiting hole (301), the tightening wedge block (502) respectively presses the fixed wedge block (501) inward to drive the anchoring steel bar (102) to anchor the steel mesh (4) inward; after the anchor rod (302) is inserted into place, cement slurry is filled into the transverse anchor hole (101) by means of pressurization.

2. A deep foundation pit support structure according to claim 1, characterized in that: The foundation pit slope (2) is covered with a corresponding concrete layer (9).

3. A deep foundation pit support structure according to claim 2, characterized in that: The outer end of the anchoring steel bar (102) extends to the outside of the concrete layer (9) and is fixedly connected to a layer of isolation steel mesh (10) spaced apart from the concrete layer (9).

4. A deep foundation pit support structure according to claim 3, characterized in that: A corresponding polymer damping material layer (11) is laid between the isolation steel mesh (10) and the concrete layer (9).

5. A deep foundation pit support structure according to claim 1, characterized in that: The tightening wedge block (502) has a plurality of corresponding abutment balls (8) rollingly mounted on a side surface opposite to the fixed wedge block (501), and the ends of the abutment balls (8) respectively roll and abut against the end surface of the fixed wedge block (501).

6. A deep foundation pit support structure according to claim 5, characterized in that: The rear ends of a group of the arc-shaped bottom plates (6) are respectively folded upwards and provided with guide convex edges (601).

7. A deep foundation pit support structure according to claim 6, characterized in that: A guide groove for guiding the abutting ball (8) is provided on the end surface of the fixed wedge block (501), and the upper ends of the guide grooves are respectively provided in an open shape.

8. The deep foundation pit support structure according to claim 1, characterized in that: The outer end of the anchor rod (302) abuts against the outer end of the limiting hole (301).

9. A deep foundation pit support structure according to claim 8, characterized in that: The space between the anchor rod (302) and the limiting hole (301) is pressurized and filled with corresponding cement slurry.

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