CN212316942U

CN212316942U - Inclined support foundation pit supporting system

Info

Publication number: CN212316942U
Application number: CN202020888684.4U
Authority: CN
Inventors: 汪小健; 陈家冬; 吴亮
Original assignee: Jiangsu Foundation Engineering Co ltd
Current assignee: Jiangsu Foundation Engineering Co ltd
Priority date: 2020-05-23
Filing date: 2020-05-23
Publication date: 2021-01-08
Anticipated expiration: 2030-05-23

Abstract

The utility model relates to an inclined supporting excavation supporting system relates to the technical field of building foundation ditch construction, and it includes the deep basal pit body, and the edge of deep basal pit body is provided with fender pile and stagnant water stake, and one side of fender pile is provided with the stand pile, is provided with the link between stand pile and the fender pile, and one side of link is connected with a plurality of inclined supporting frames. The utility model provides a link can strengthen the joint strength between stand pile and the fender pile, and bearing diagonal frame and link fixed connection can make a plurality of bearing diagonal frame link together on overall structure to can make the joint strength between a plurality of bearing diagonal frames play better supporting role to deep basal pit more greatly.

Description

Inclined support foundation pit supporting system

Technical Field

The utility model belongs to the technical field of the technique of building foundation ditch construction and specifically relates to a bearing diagonal excavation supporting system is related to.

Background

Along with the speed of urbanization in China, people develop and utilize underground spaces increasingly widely, building foundation pit engineering has the characteristics of large size, depth, tightness, closeness and the like, and various novel enclosure forms and construction processes are continuously developed. For large-area deep foundation pit engineering, the horizontal supporting structure is generally adopted, huge soil pressure is transmitted to the supporting body on the other side through the horizontal supporting structure, when the plane size of the foundation pit is large, the large-length supporting structure is needed to transmit the soil pressure, and in addition, when the support is dismantled, the supports on two sides are also symmetrically dismantled, so that the construction difficulty is large.

In order to solve the above problems, the prior art has developed an inclined supporting structure, for example, the utility model patent with publication number CN108978670A specifically discloses a supporting method for deep foundation pit local deep pit inclined throwing, which includes the following steps: a. excavating a deep foundation pit, b, pouring a concrete support, c, arranging a plurality of inclined cast supports, and completing the support of the inclined cast supports of the local deep pit of the deep foundation pit.

Although the technical scheme can reduce the construction difficulty through the arrangement of the inclined supports, the local inclined cast support of the deep foundation pit has no method for forming a plurality of local inclined cast support supports into a whole independently, so that the support strength of a single inclined cast support is limited, and no method has a better support effect on the support of the deep foundation pit.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing an inclined strut excavation supporting system, this support system can strengthen the connection between a plurality of inclined struts, makes the support intensity of inclined strut bigger, can play better supporting role to deep basal pit.

The above object of the present invention is achieved by the following technical solutions:

an inclined support foundation pit supporting system comprises a deep foundation pit body, wherein a fender post and a water stop post are arranged at the edge of the deep foundation pit body, a stand column pile is arranged on one side, facing the center of the deep foundation pit body, of the fender post, a connecting frame is arranged between the stand column pile and the fender post, and one side, facing the center of the deep foundation pit body, of the connecting frame is connected with a plurality of inclined support frames;

the connecting frame comprises a first support column fixedly connected with the upper end of the fender post, a second support column fixedly connected with the upper end of the upright post pile and a first horizontal supporting frame arranged between the first support column and the second support column;

one end and the second pillar fixed connection of bearing diagonal frame, the other end and deep basal pit body diapire fixed connection.

Through adopting above-mentioned technical scheme, the link between stand pile and the fender pile can strengthen the joint strength between stand pile and the fender pile, bearing diagonal frame and link fixed connection, can make a plurality of bearing diagonal frame link together on overall structure, thereby can make the joint strength between a plurality of bearing diagonal frames bigger, when the bearing diagonal played the supporting role to the deep basal pit body, a plurality of bearing diagonal interconnect can make the bearing strength of bearing diagonal bigger, can play better supporting role to the deep basal pit.

The present invention may be further configured in a preferred embodiment as: the first horizontal support frame is provided with first connecting structures along two sides of the length direction, the first connecting structures on the two sides are arranged in a staggered mode, each first connecting structure comprises a pouring groove, a connecting groove and a connecting rod, the pouring groove is formed in the first horizontal support frame along the vertical direction, the connecting groove is formed in the horizontal support frame along the horizontal direction, the connecting rods are fixedly connected in the pouring grooves, the pouring grooves are communicated with the connecting grooves, and the connecting rods are arranged in extending spaces of the connecting grooves;

one sides of the first supporting column and the second supporting column, which face the horizontal supporting frame, are respectively provided with a second connecting structure matched with the first connecting structure, each second connecting structure comprises a step plate fixedly connected with the side walls of the first supporting column and the second supporting column, an inserting block fixedly connected with the step plate and a connecting hole formed in the end face, far away from the step plate, of the inserting block, the inserting block is in inserting fit with the connecting groove, and the connecting rod is in inserting fit with the connecting hole;

and a concrete layer is filled between the pouring groove and the inserting block.

Through adopting above-mentioned technical scheme, when first horizontal support frame is connected with first stand and second stand, the grafting piece of first stand and second stand lateral wall can be pegged graft to the spread groove in, and the connecting rod in the casting groove can peg graft to the connecting hole on the grafting piece, consequently first stand and second stand are great with first horizontal support frame's joint strength, in the cooperation of pegging graft piece and spread groove, to pouring the inslot intussuseption concrete, after the concrete solidifies, the joint strength between grafting piece and the first horizontal support frame is bigger, thereby can make the joint strength of link bigger, can play better supporting role when bearing diagonal frame is connected with the link.

The present invention may be further configured in a preferred embodiment as: the inclined supporting frame comprises a plurality of third supporting columns which are parallel to each other, and a horizontal cross rod and an inclined rod which are fixedly connected with the third supporting columns, wherein the horizontal cross rod and the inclined rod are intersected with each other to form a plurality of triangular structures.

Through adopting above-mentioned technical scheme, horizontal pole and down tube can play the effect of connecting to the third pillar, and horizontal pole and down tube enclose synthetic triangle column structure comparatively steadily stable to can make the bearing diagonal have stronger supporting power, can play better supporting role to the deep basal pit body.

The present invention may be further configured in a preferred embodiment as: a horizontal truss is arranged between the inclined support frame and the second support column, the horizontal truss comprises a support column fixedly connected with the deep foundation pit body and a second horizontal support frame arranged between the support column and the second support column, one side of the second horizontal support frame is fixedly connected with the second support column, and the other side of the second horizontal support frame is fixedly connected with the upper end of the support column;

the second horizontal support frame comprises two connecting columns which are parallel to each other and a plurality of supporting rods which are arranged between the two connecting columns, the two ends of each supporting rod are fixedly connected with the side walls of the two connecting columns respectively, and the two supporting rods are adjacent to each other to form a triangular structure between the supporting rods.

Through adopting above-mentioned technical scheme, support column and the second horizontal support frame in the horizontal truss can further play the effect of support to the bearing diagonal frame, make being connected between bearing diagonal frame and the deep basal pit body more firm to spliced pole and branch in the second horizontal support frame can guarantee the certain joint strength of horizontal truss self, thereby can play certain supporting role to the bearing diagonal frame, guarantee the strong supporting role of bearing diagonal frame to the deep basal pit body.

The present invention may be further configured in a preferred embodiment as: be provided with the prestressed beam between bearing diagonal frame and the second pillar, the prestressed beam includes a plurality of bracing pieces and the extension roof beam structure with second pillar fixed connection, the bracing piece sets up and end to end fixed connection with the extension roof beam structure interval, the extension roof beam structure sets up the symmetrical structure of width in the middle of the narrow both ends, the bearing diagonal frame set up in one side of bracing piece and with bracing piece fixed connection.

Through adopting above-mentioned technical scheme, the joint strength between a plurality of bearing diagonal frames can further be strengthened to the prestressing force roof beam to the wide structure in the middle of extending the roof beam structure both ends narrow can offset certain bearing capacity on the bearing diagonal frame, thereby can make the bearing diagonal frame bigger to the support intensity of deep basal pit body, and the support effect is better.

The present invention may be further configured in a preferred embodiment as: and a circular oblique arch is arranged between the adjacent oblique support frames and comprises a circular support frame fixedly connected with the oblique support frames and a fourth support column fixedly connected with the circular support frame, one end, far away from the circular support frame, of the fourth support column is fixedly connected with the second support column, and the center position of the circular support frame in the length direction is fixedly connected with the second support column.

Through adopting above-mentioned technical scheme, circular support frame and fourth pillar in the circular skew arch can play the effect of connecting to two adjacent bearing diagonal frames, make the joint strength between two adjacent bearing diagonal frames bigger to can play stable support to the deep basal pit body.

The present invention may be further configured in a preferred embodiment as: this internal supporting platform that is provided with of deep basal pit, supporting platform is including inlaying the reinforcement platform of establishing in deep basal pit body diapire and setting up the bearing platform on reinforcing the bench, the one end and the bearing platform fixed connection of second pillar are kept away from to the bearing diagonal frame.

Through adopting above-mentioned technical scheme, this internal reinforcing platform of deep basal pit and bearing platform can play certain supporting role to the bearing platform, when the bearing platform is under construction bearing platform, with bearing platform looks fixed connection of bearing platform, has not only strengthened bearing strength of bearing platform, also can prevent that the sunken phenomenon from appearing in the deep basal pit body under the action of gravity of bearing platform simultaneously.

The present invention may be further configured in a preferred embodiment as: be provided with third connection structure between bearing platform and the bearing diagonal frame, third connection structure includes with bearing diagonal frame lower extreme fixed connection's connecting block, sets up pre-installation hole and the fixed orifices on the bearing platform, the pre-installation hole is provided with a plurality ofly, and is a plurality of pre-installation hole and fixed orifices intercommunication, connecting block and pre-installation hole grafting cooperation, set up the spacing hole that corresponds with the fixed orifices on the connecting block, spacing dead lever has been pegged graft in fixed orifices and the spacing hole.

Through adopting above-mentioned technical scheme, when making bearing diagonal frame and supporting platform be connected, make the connecting block of bearing diagonal frame lower extreme and the pre-installation hole on the bearing platform be pegged graft mutually and cooperate, connect spacing dead lever to spacing hole in again, spacing dead lever can connect to in the connecting block in can inserting simultaneously, can play spacing fixed effect to bearing diagonal frame, make bearing diagonal frame and supporting platform's joint strength bigger, guarantee the support intensity of bearing diagonal frame to the deep basal pit body.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the connecting frame between the upright post pile and the guard post can enhance the connecting strength between the upright post pile and the guard post, the inclined support frames are fixedly connected with the connecting frame, and a plurality of inclined support frames can be connected together on the whole structure, so that the connecting strength between the inclined support frames can be higher, and when the inclined support supports the deep foundation pit body, the inclined support can better support the deep foundation pit;

2. the connecting strength between a plurality of inclined support frames can be enhanced by the arrangement of the horizontal truss, the prestressed beam and the circular inclined arch, so that the supporting strength of the plurality of inclined support frames to the deep foundation pit body can be ensured.

Drawings

Fig. 1 is an overall schematic view of a deep foundation pit body supporting structure;

FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;

FIG. 3 is an enlarged partial schematic view of portion B of FIG. 1;

FIG. 4 is an exploded view of the structure between the diagonal bracing frame and the support platform;

fig. 5 is an overall schematic view of a foundation pit supporting structure in the second embodiment;

fig. 6 is an overall schematic view of the foundation pit supporting structure in the third embodiment.

In the figure, 1, a deep foundation pit body; 2. a fender pile; 3. water stopping piles; 4. a vertical column pile; 5. a connecting frame; 51. a first support; 52. a second support; 53. a first horizontal support frame; 6. an inclined support frame; 61. a third support; 62. a horizontal cross bar; 63. a diagonal bar; 7. a support platform; 71. a reinforcing table; 72. a bearing table; 8. a first connecting structure; 81. pouring a groove; 82. connecting grooves; 83. a connecting rod; 9. a second connecting structure; 91. a step plate; 92. an insertion block; 93. connecting holes; 10. a horizontal truss; 101. a support pillar; 102. a second horizontal support frame; 103. connecting columns; 104. a strut; 11. a third connecting structure; 111. connecting blocks; 112. pre-installing holes; 113. a fixing hole; 114. a limiting hole; 115. a limiting fixing rod; 12. a prestressed beam; 121. a support bar; 122. an extension beam frame; 13. a circular skew arch; 131. a circular support frame; 132. and a fourth support.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows: referring to fig. 1, for the utility model discloses an inclined supporting foundation pit supporting system, including deep basal pit body 1, the edge of deep basal pit body 1 is provided with fender pile 2 and stagnant water stake 3, and stagnant water stake 3 can be completely cut off the outside groundwater of deep basal pit body 1 in the outside of deep basal pit body 1, can prevent that groundwater from entering into deep basal pit body 1 inside at the in-process of construction, guarantees deep basal pit body 1's normal construction. Fender pile 2 is provided with stand pile 4 towards one side at deep basal pit body 1 center, is provided with link 5 between stand pile 4 and the fender pile 2, and stand pile 4 can play certain supporting role to the lateral wall of deep basal pit body 1 with fender pile 2, can not lead to collapsing of deep basal pit body 1 inside wall earthwork in the construction stage.

Referring to fig. 1, one side of the connecting frame 5 facing the center of the deep foundation pit body 1 is connected with a plurality of inclined support frames 6 (only two are shown in the figure), one end of each inclined support frame 6 is fixedly connected with the connecting frame 5, and the other end of each inclined support frame is fixedly connected with the bottom wall of the deep foundation pit body 1. Be provided with supporting platform 7 in the deep basal pit body 1, supporting platform 7 is including inlaying reinforcing platform 71 and the bearing platform 72 of setting on reinforcing platform 71 of establishing in the deep basal pit body 1 diapire, and the one end and the bearing platform 72 fixed connection of link 5 are kept away from to bearing diagonal frame 6.

Referring to fig. 1, the connecting frame 5 includes a first supporting column 51 fixedly connected to the upper end of the fender pile 2, a second supporting column 52 fixedly connected to the upper end of the stud pile 4, and a first horizontal supporting frame 53 disposed between the first supporting column 51 and the second supporting column 52, and the upper end of the inclined supporting frame 6 far away from the stud pile 4 is fixedly connected to the second supporting column 52.

Referring to fig. 1, the inclined support frame 6 includes a plurality of third pillars 61 parallel to each other, and a horizontal cross bar 62 and an inclined bar 63 fixedly connected to the third pillars 61, the horizontal cross bar 62 and the inclined bar 63 are intersected with each other to form a plurality of triangle structures, two sides of the inclined support frame 6 in the width direction can be connected with reinforcing bars, and the lower ends of the reinforcing bars are extended and embedded into the soil layer at the bottom of the deep foundation pit body 1.

Referring to fig. 2, a horizontal truss 10 is arranged between the inclined support frame 6 and the second support column 52, the horizontal truss 10 includes a support column 101 fixedly connected with the deep foundation pit body 1 and a second horizontal support frame 102 arranged between the support column 101 and the second support column 52, one side of the second horizontal support frame 102 is fixedly connected with the second support column 52, and the other side is fixedly connected with the upper end of the support column 101. The second horizontal support frame 102 comprises two connecting columns 103 which are parallel to each other and a plurality of struts 104 which are arranged between the two connecting columns 103, two ends of the struts 104 are fixedly connected with the side walls of the two connecting columns 103 respectively, a triangular structure is formed between the adjacent struts 104, and the triangular structure formed by the struts 104 can strengthen the connecting structure of the whole horizontal truss 10.

Referring to fig. 3, the first horizontal support frame 53 is provided with the first connecting structures 8 along both sides of the length direction, the first connecting structures 8 on both sides are arranged in a staggered manner, the first connecting structures 8 include a pouring groove 81 formed in the first horizontal support frame 53 along the vertical direction, a connecting groove 82 formed in the horizontal support frame along the horizontal direction, and a connecting rod 83 fixedly connected in the pouring groove 81, the pouring groove 81 is communicated with the connecting groove 82, and the connecting rod 83 is arranged in an extending space of the connecting groove 82.

Referring to fig. 3, the first support columns 51 and the second support columns 52 are provided with second connecting structures 9 on one sides facing the horizontal support frame, the second connecting structures 9 are matched with the first connecting structures 8, and the second connecting structures 9 on the first support columns 51 and the second support columns 52 are also arranged in a staggered manner. The second connecting structure 9 includes a step plate 91 fixedly connected to the side walls of the first support column 51 and the second support column 52, an inserting block 92 fixedly connected to the step plate 91, and a connecting hole 93 formed in the end face of the inserting block 92 away from the step plate 91, the inserting block 92 is inserted into and matched with the connecting groove 82, the connecting rod 83 is inserted into and matched with the connecting hole 93, when the inserting block 92 is matched with the connecting groove 82, concrete is poured into the pouring groove 81, so that a concrete layer is formed between the inserting block 92 and the connecting groove 82, and the connecting of the inserting block 92 and the first horizontal support frame 53 can be more tightly and firmly connected.

Referring to fig. 4, one end of the inclined support frame 6, which is far away from the second support column 52, is fixedly connected with the bearing table 72, one end of the inclined support frame 6, which is connected with the bearing table 72, is embedded in a deep foundation pit soil layer, a third connecting structure 11 is arranged between the inclined support frame 6 and the bearing table 72, the third connecting structure 11 comprises a connecting block 111, a pre-installation hole 112 and a fixing hole 113, which are fixedly connected with the lower end of the inclined support frame 6, the pre-installation hole 112 is formed in the bearing table 72, the pre-installation hole 112 is provided with a plurality of pre-installation holes 112, the connecting block 111 is in inserted fit with the pre-installation hole 112, a limiting hole 114 corresponding to the fixing hole 113 is formed in the connecting block 111, and a limiting.

The implementation principle of the embodiment is as follows: after the water piles 3, the guard piles 2 and the upright piles 4 are driven, the first support columns 51 are erected at the upper ends of the guard piles 2, the first support columns 51 are connected end to end, the second support columns 52 are erected at the upper ends of the upright piles 4, the first horizontal support frames 53 are erected between the first support columns 51 and the second support columns 52, when the first horizontal support frames 53 are erected, the first connecting structures 8 and the second connecting structures 9 are connected in an aligned mode, concrete is poured into the pouring grooves 81, and therefore the first horizontal support frames 53 can be connected with the first support columns 51 and the second support columns 52 more firmly.

After the connecting frame 5 is erected, the horizontal truss 10 is installed on one side of the second support column 52, the inclined support frame 6 is installed on one side of the horizontal truss 10, one end, far away from the second support column 52, of the inclined support frame 6 is connected with the bearing table 72 when the inclined support frame 6 is installed, the connecting block 111 at the lower end of the inclined support frame 6 is matched with the pre-installation hole 112 in an inserted mode, then the limiting fixing rod 115 is inserted into the limiting hole 114, and the inclined support frame 6 is connected with the bearing table 72 in an installed mode.

Example two: for the utility model discloses a bearing diagonal excavation supporting system, refer to fig. 5, the difference with embodiment one lies in, be provided with prestressed girder 12 between bearing diagonal frame 6 and the second pillar 52, prestressed girder 12 includes a plurality of bracing pieces 121 with second pillar 52 fixed connection and extends roof beam structure 122, bracing piece 121 and extend roof beam structure 122 interval setting and end to end fixed connection, bracing piece 121 and extension roof beam structure 122 can be connected through reinforcing bolt with being connected of second pillar 52, bracing piece 121 and the connected mode that extends between the roof beam structure 122 can be the welding, it sets up to the narrow middle wide symmetrical structure in both ends to extend roof beam structure 122, bearing diagonal frame 6 sets up in one side of bracing piece 121 and with bracing piece 121 fixed connection, the joint strength between a plurality of bearing diagonal frames 6 can be strengthened to prestressed girder 12.

Example three: for the utility model discloses a bearing diagonal excavation supporting system, refer to fig. 6, with embodiment one and embodiment two the difference lie in, be provided with circular skew arch 13 between the adjacent bearing diagonal frame 6, circular skew arch 13 include with 6 fixed connection's of bearing diagonal frame circular support frame 131 and with circular support frame 131 fixed connection's fourth pillar 132, circular support frame 131's one end and second pillar 52 fixed connection are kept away from to fourth pillar 132, circular support frame 131 length direction's central point puts and second pillar 52 fixed connection, fixed connection's mode can adopt connecting piece fixed connection such as welding and bolt.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides an inclined strut excavation supporting system, includes deep basal pit body (1), its characterized in that: a fender post (2) and a water stop pile (3) are arranged at the edge of the deep foundation pit body (1), a stand post (4) is arranged on one side, facing the center of the deep foundation pit body (1), of the fender post (2), a connecting frame (5) is arranged between the stand post (4) and the fender post (2), and one side, facing the center of the deep foundation pit body (1), of the connecting frame (5) is connected with a plurality of inclined support frames (6);

the connecting frame (5) comprises a first support column (51) fixedly connected with the upper end of the fender post (2), a second support column (52) fixedly connected with the upper end of the upright post pile (4) and a first horizontal support frame (53) arranged between the first support column (51) and the second support column (52);

one end of the inclined support frame (6) is fixedly connected with the second support column (52), and the other end of the inclined support frame is fixedly connected with the bottom wall of the deep foundation pit body (1).

2. The diagonal bracing foundation pit supporting system according to claim 1, wherein: the first horizontal support frame (53) is provided with first connecting structures (8) along two sides of the length direction, the first connecting structures (8) on two sides are arranged in a staggered mode, each first connecting structure (8) comprises a pouring groove (81) formed in the first horizontal support frame (53) along the vertical direction, a connecting groove (82) formed in the horizontal support frame along the horizontal direction and a connecting rod (83) fixedly connected in the pouring groove (81), the pouring groove (81) is communicated with the connecting groove (82), and the connecting rod (83) is arranged in an extending space of the connecting groove (82);

one sides of the first supporting column (51) and the second supporting column (52) facing the horizontal supporting frame are respectively provided with a second connecting structure (9) matched with the first connecting structure (8), each second connecting structure (9) comprises a step plate (91) fixedly connected with the side walls of the first supporting column (51) and the second supporting column (52), an inserting block (92) fixedly connected with the step plate (91) and a connecting hole (93) formed in the end face, far away from the step plate (91), of the inserting block (92), the inserting block (92) is in inserting fit with the connecting groove (82), and the connecting rod (83) is in inserting fit with the connecting hole (93);

and a concrete layer is filled between the pouring groove (81) and the insertion block (92).

3. The diagonal bracing foundation pit supporting system according to claim 1, wherein: the inclined support frame (6) comprises a plurality of third supporting columns (61) which are parallel to each other, and a horizontal cross rod (62) and an inclined rod (63) which are fixedly connected with the third supporting columns (61), wherein the horizontal cross rod (62) and the inclined rod (63) are intersected with each other to form a plurality of triangular structures.

4. The diagonal bracing excavation supporting system of claim 3, wherein: a horizontal truss (10) is arranged between the inclined support frame (6) and the second support column (52), the horizontal truss (10) comprises a support column (101) fixedly connected with the deep foundation pit body (1) and a second horizontal support frame (102) arranged between the support column (101) and the second support column (52), one side of the second horizontal support frame (102) is fixedly connected with the second support column (52), and the other side of the second horizontal support frame is fixedly connected with the upper end of the support column (101);

the second horizontal support frame (102) comprises two connecting columns (103) which are parallel to each other and a plurality of struts (104) which are arranged between the two connecting columns (103), the two ends of each strut (104) are fixedly connected with the side walls of the two connecting columns (103) respectively, and the struts (104) form a triangular structure.

5. The diagonal bracing excavation supporting system of claim 3, wherein: be provided with prestressed beam (12) between bracing frame (6) and second pillar (52), prestressed beam (12) include with second pillar (52) fixed connection a plurality of bracing pieces (121) and extend roof beam structure (122), bracing piece (121) and extend roof beam structure (122) interval set up and end to end fixed connection, extend roof beam structure (122) set up to the narrow symmetrical structure in middle of both ends, bracing frame (6) set up in one side of bracing piece (121) and with bracing piece (121) fixed connection.

6. The diagonal bracing excavation supporting system of claim 3, wherein: it is adjacent be provided with circular skew arch (13) between bearing diagonal frame (6), circular skew arch (13) include with bearing diagonal frame (6) fixed connection's circular support frame (131) and with circular support frame (131) fixed connection's fourth pillar (132), the one end and second pillar (52) fixed connection of circular support frame (131) are kept away from in fourth pillar (132), circular support frame (131) length direction's central point puts and second pillar (52) fixed connection.

7. A bracing excavation supporting system according to claim 4 or 5 or 6, wherein: be provided with supporting platform (7) in deep basal pit body (1), supporting platform (7) are including inlaying reinforcement platform (71) of establishing in deep basal pit body (1) diapire and bearing platform (72) of setting on reinforcement platform (71), the one end and bearing platform (72) fixed connection of second pillar (52) are kept away from in bearing diagonal frame (6).

8. The diagonal bracing excavation supporting system of claim 7, wherein: be provided with third connection structure (11) between bearing platform (72) and bearing diagonal frame (6), third connection structure (11) include with bearing diagonal frame (6) lower extreme fixed connection connecting block (111), set up pre-installation hole (112) and fixed orifices (113) on bearing platform (72), pre-installation hole (112) are provided with a plurality ofly, and are a plurality of pre-installation hole (112) are linked together with fixed orifices (113), connecting block (111) and pre-installation hole (112) are pegged graft the cooperation, set up spacing hole (114) corresponding with fixed orifices (113) on connecting block (111), spacing dead lever (115) have been pegged graft in fixed orifices (113) and spacing hole (114).