CN112030980B

CN112030980B - Foundation pit supporting structure with tunnel on side wall of foundation pit and using method

Info

Publication number: CN112030980B
Application number: CN202010726694.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Tieneng Construction Engineering Co ltd
Current assignee: SHANGHAI TIENENG CONSTRUCTION ENGINEERING Co.,Ltd.
Priority date: 2020-07-25
Filing date: 2020-07-25
Publication date: 2021-11-16
Anticipated expiration: 2040-07-25
Also published as: CN112030980A

Abstract

The invention discloses a foundation pit supporting structure with a tunnel on the side wall of a foundation pit and a using method thereof. The invention discloses a method for supporting the soil layer of a tunnel, which is characterized in that a fixing hole positioned above and below the tunnel is arranged in a foundation pit, an upright post which is provided with an embedded floor bolt and is abutted against the side wall of the foundation pit is deeply arranged in the fixing hole, and a primary clamp and a secondary clamp which can lock and limit one end of a slurry plate and one end of a floor are arranged by the upright post so as to provide limit support for the foundation pit and the tunnel soil layer; the tunnel structure is provided with a buffer plate elastically supported by a primary spring, and a connecting plate elastically supported by a secondary spring is arranged by utilizing a sleeve rod and an inner rod which are sleeved and connected, so that the tunnel structure is reinforced and protected by utilizing a primary concrete layer and a secondary concrete layer which are formed by pouring; through setting up the second grade anchor clamps between two adjacent stands to in the fixed floor that sets up in foundation ditch upper end, and through set up two as a set of bayonet socket in the floor, utilize the bayonet socket to set up the spacing seat that offsets, so that carry out the structure at the soil layer of foundation ditch upper end and fix.

Description

Foundation pit supporting structure with tunnel on side wall of foundation pit and using method

Technical Field

The invention relates to the technical field of foundation pit infrastructure security and protection maintenance, in particular to a foundation pit supporting structure with a tunnel on the side wall of a foundation pit and a using method thereof.

Background

The foundation pit is a soil pit excavated at a foundation design position according to the base elevation and the base plane size, and a corresponding tunnel structure can be arranged in part of the foundation pit according to actual needs. Excavation of foundation pits generally has a large engineering quantity, and in order to guarantee normal operation of engineering, an excavation scheme must be determined according to geological and hydrological data and the conditions of buildings nearby the site before excavation, and waterproof and drainage work is performed. The person who is not excavated can use the method of putting the side slope to stabilize the earth slope, and the size of the slope is determined according to the relevant construction regulations.

The foundation ditch of different gradients can lead to the soil layer to collapse and has the possibility of equidimension not, moreover because foundation ditch relief is low-lying, soil extremely easily causes soil erosion and water loss with the earth's surface flowing water to cause the damaged accident that causes to collapse of foundation ditch soil layer structure. In order to ensure the firmness and the safety of a foundation pit structure, a mode of excavating deeper and adjacent buildings is generally adopted under the traditional technology, a foundation pit wall supporting and concrete-spraying wall protecting means is adopted to realize the protection of the foundation pit structure, large foundation pits even adopt methods such as interlocking of underground continuous walls and columnar cast-in-situ bored piles and the like to prevent the outside soil layer from collapsing, but the technical means lack sufficient supporting measures for the foundation pit with a tunnel structure, and particularly when the opening of the tunnel in the foundation pit is large, the tunnel is subjected to huge extrusion acting force from all directions, and the tunnel is more prone to collapse accidents than the foundation pit.

Disclosure of Invention

The invention aims to solve the problem that a supporting structure of a foundation pit with a tunnel is difficult to construct in the prior art, and provides a foundation pit supporting structure with a tunnel on the side wall of the foundation pit and a using method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a foundation pit supporting structure with tunnels on the side wall of a foundation pit comprises a pit body, wherein the side wall of the pit body is respectively provided with a tunnel and two rows of fixing holes, the side wall of the tunnel is obliquely provided with three watering cavities, two rows of fixing holes are fixedly sleeved with floor bolts, the floor bolts are fixedly connected with stand columns, and two primary clamps and one secondary clamp are respectively connected between every two adjacent stand columns;

the inner walls of the upper end and the lower end of the tunnel are fixedly nested with fixed plates, primary springs are welded on the fixed plates, buffer plates are welded on the primary springs, loop bars are welded at the inner ends of the tunnel, inner rods are sleeved in the loop bars in a sliding mode, the inner rods are connected with secondary springs and connecting plates respectively, a side plate is connected between the two connecting plates, the side plates are integrally connected with pouring plates sleeved in a pouring cavity, connecting rods are connected to the two buffer plates through bolts, two ends of each connecting rod are fixedly connected with mud plates corresponding to the primary clamps and the side plates, sleeves are fixedly sleeved in the two mud plates, frames are sleeved between the two mud plates, and sleeves sleeved in the sleeves are fixedly connected to the upper end and the lower end of each frame;

the upper end of the pit body is provided with a floor corresponding to the secondary clamp, a plurality of groups of two bayonets which are a group are arranged in the floor, and the bayonets are sleeved with limiting seats positioned on the pit body.

Preferably, the tunnel is located in the middle of the side wall of the pit body, and the two rows of fixing holes are located above and below the tunnel respectively.

Preferably, the two first-stage clamps correspond to the two mud plates respectively, the second-stage clamps correspond to the upper ends of the pit bodies, first-stage clamping openings for sleeving the mud plates are formed in the two first-stage clamps, and second-stage clamping openings for sleeving the floors are formed in the second-stage clamps.

Preferably, the connecting plate is connected to one end of the inner rod which penetrates through the buffer plate in a sliding manner, and two ends of the secondary spring sleeved on the inner rod are respectively welded with the buffer plate and the connecting plate.

Preferably, the curb plate is the slot-like structure, and the curb plate offsets with the tunnel inner wall, the filling has one-level concrete layer in watering board and the watering chamber, and the filling has second grade concrete layer between buffer board and the mud board.

A use method of a foundation pit supporting structure with a tunnel on the side wall of a foundation pit comprises the following steps:

step S1, two rows of fixing holes are arranged in the side wall of the pit body and are positioned above and below the tunnel, a floor bolt is fixedly nested in the fixing holes, and an upright post abutting against the side wall of the pit body is fixedly arranged by utilizing the free end of the floor bolt;

step S2, pressing the two connecting plates up and down to conveniently arrange a side plate vertically between the two connecting plates, nesting the pouring plates outside the side plates in the three pouring cavities, and filling a primary concrete layer in the pouring cavities through the pouring plates;

step S3, arranging horizontally distributed mud plates by using connecting rods, respectively sleeving one ends of the two mud plates in primary clamping openings of two primary clamps, and locking and fixing one ends of the mud plates in the upright posts by using bolts;

step S4, sleeving a frame of a groove-shaped structure between two mud plates, respectively sleeving sleeves at the upper end and the lower end of the frame in sleeves on the two mud plates, locking and fixing the corresponding frame, the mud plates, the side plates and one end of the connecting plate by using bolts at the inner end of the tunnel, and filling a secondary concrete layer between the buffer plate and the mud plates;

and step S5, horizontally laying a floor on the upper end of the pit body, sleeving one end of the floor in a secondary clamping opening on a secondary clamp, locking and fixing the floor by using bolts, sleeving a limiting seat positioned at the upper end of the pit body in two adjacent bayonets of the floor, and screwing a fixing bolt between the limiting seat and the floor.

Preferably, in the step S1, the floor plug is horizontally inserted into the fixing hole, and the lower end of the upright post is vertically inserted into the lower end of the pit body.

Preferably, the height positions of the primary clamp and the secondary clamp between two adjacent upright posts in the steps S3 and S5 can be adjusted up and down, so that the two primary clamps correspond to two mud boards and the two secondary clamps correspond to the floor level.

Preferably, in the step S4, two ends of the sleeve are communicated with each other, and one end of the sleeve extending out of the sleeve is fixedly embedded in the secondary concrete layer.

Compared with the prior art, the invention has the following advantages:

1. the side wall of the foundation pit body is provided with the fixing holes positioned above and below the tunnel, the fixing holes are used for deeply inserting the embedded floor bolts to form the stand columns which are abutted against the side wall of the foundation pit, and the stand columns are used for forming the primary clamp and the secondary clamp which can lock and limit one ends of the slurry plate and the floor, so that the soil layer on the side wall of the foundation pit can be intercepted and limited, and the slurry plate and the floor can be used for providing limiting support for the foundation pit and the tunnel soil layer.

2. The invention arranges buffer plates elastically supported by primary springs at the upper and lower ends of the tunnel, and arranges connecting plates elastically supported by secondary springs by using sleeve rods and inner rods which are sleeved and connected so as to arrange mud plates and side plates connected with pouring plates in the tunnel respectively, thereby pouring and forming a primary concrete layer and a secondary concrete layer so as to perform solid limit support on the upper and lower ends and the side wall soil layer of the tunnel.

3. According to the invention, the two-stage clamp is arranged between two adjacent upright posts, so that the floor is fixedly arranged at the upper end of the foundation pit, and two bayonets which are a group are arranged in the floor, and the bayonets are used for arranging the abutted limiting seats, so that the soil layer at the upper end of the foundation pit is structurally fixed, and the water and soil loss caused by surface water is avoided.

In summary, the invention opens a fixing hole on the upper and lower sides of the tunnel in the foundation pit, and uses the embedded floor bolt to set the upright column which is pressed against the side wall of the foundation pit, and uses the upright column to set the primary clamp and the secondary clamp which can lock and limit the mud plate and one end of the floor, so as to provide limit support for the foundation pit and the tunnel soil layer; the tunnel structure is provided with a buffer plate elastically supported by a primary spring, and a connecting plate elastically supported by a secondary spring is arranged by utilizing a sleeve rod and an inner rod which are sleeved and connected so as to be convenient for arranging a mud plate and a side plate connected with an irrigation plate in the tunnel respectively, thereby utilizing a primary concrete layer and a secondary concrete layer which are formed by irrigation to strengthen and protect the tunnel structure; through setting up the second grade anchor clamps between two adjacent stands to in the fixed floor that sets up in foundation ditch upper end, and through set up two as a set of bayonet socket in the floor, utilize the bayonet socket to set up the spacing seat that offsets, so that carry out the structure at the soil layer of foundation ditch upper end and fix.

Drawings

Fig. 1 is a schematic structural diagram of a foundation pit supporting structure provided with a tunnel on a side wall of a foundation pit according to the invention;

fig. 2 is an enlarged schematic view of a part a of a structure of a foundation pit supporting structure with a tunnel on a side wall of the foundation pit, which is provided by the invention;

fig. 3 is a schematic diagram of a pit body structure of a foundation pit supporting structure with a tunnel on a side wall of a foundation pit according to the invention;

fig. 4 is a schematic view of a connection structure of a floor bolt, an upright post, a primary clamp and a secondary clamp of a foundation pit supporting structure with a tunnel on the side wall of the foundation pit, provided by the invention;

fig. 5 is a schematic side plate structure of a foundation pit supporting structure with a tunnel on the side wall of the foundation pit according to the invention;

fig. 6 is a schematic diagram of a frame structure of a foundation pit supporting structure provided with a tunnel on a side wall of a foundation pit according to the present invention;

fig. 7 is a schematic view of a connection structure of a floor and a limiting seat of a foundation pit supporting structure with a tunnel on a side wall of a foundation pit according to the present invention.

In the figure: 1 pit body, 2 tunnels, 3 fixed holes, 4 pouring cavities, 5 floor bolts, 6 upright posts, 7 primary clamps, 71 primary clamping openings, 8 secondary clamps, 81 secondary clamping openings, 9 fixed plates, 10 primary springs, 11 buffer plates, 12 loop bars, 13 inner rods, 14 secondary springs, 15 connecting plates, 16 side plates, 17 pouring plates, 18 primary concrete layers, 19 connecting rods, 20 mud plates, 21 sleeves, 22 frames, 23 sleeves, 24 secondary concrete layers, 25 floors, 26 bayonets and 27 limiting seats.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-7, a foundation pit supporting structure with a tunnel on a side wall of a foundation pit comprises a pit body 1, and specifically referring to fig. 3 for description, the side wall of the pit body 1 is of a vertical structure, a tunnel 2 and two rows of fixing holes 3 are respectively formed in the side wall of the pit body 1, three pouring cavities 4 are obliquely formed in the side wall of the tunnel 2, the pouring cavities 4 are vertically formed and are used for being sleeved with pouring plates 17 obliquely connected to side plates 16 so as to facilitate concrete slurry in a fluid state to flow in automatically, floor bolts 5 are fixedly sleeved in the two rows of fixing holes 3, the floor bolts 5 are fixedly connected with stand columns 6, and two primary clamps 7 and one secondary clamp 8 are respectively connected between two adjacent stand columns 6;

the inner walls of the upper end and the lower end of the tunnel 2 are fixedly nested with fixed plates 9, the fixed plates 9 are welded with primary springs 10, the primary springs 10 can adopt strong springs, the primary springs 10 are welded with buffer plates 11, the inner end of the tunnel 2 is welded with loop bars 12, the loop bars 12 are sleeved with inner rods 13 in a sliding manner, the inner rods 13 are respectively connected with secondary springs 14 and connecting plates 15, by pressing the two connecting plates 15 upwards or downwards, side plates 16 are sleeved in the tunnel 2, a side plate 16 is connected between the two connecting plates 15, the side plates 16 are integrally connected with pouring plates 17 sleeved in the pouring cavity 4, the two buffer plates 11 are respectively connected with connecting rods 19 through bolts, the connecting rods 19 are obliquely arranged and are distributed at equal intervals in a straight line, so that the slurry plates 20 are fixedly installed on the buffer plates 11, and the connecting rods 19 are fixedly connected with the slurry plates 20 of which two ends correspond to the primary clamps 7 and correspond to the side plates 16, the two mud plates 20 are fixedly sleeved with sleeves 21, a frame 22 is sleeved between the two mud plates 20, the upper end and the lower end of the frame 22 are fixedly connected with sleeves 23 sleeved in the sleeves 21, and the free ends, far away from the frame 22, of the sleeves 23 extend out of the sleeves 21 so as to be embedded into a secondary concrete layer 24 to realize fixed connection;

referring to fig. 7 for details, the upper end of the pit body 1 is provided with a floor 25 corresponding to the secondary clamp 8, the floor 25 is provided with a plurality of sets of two bayonets 26, each set of two bayonets 26 is a set, and the bayonets 26 are sleeved with a limiting seat 27 located on the pit body 1, so as to fix the soil layer on the upper end of the pit body 1 and reduce the possibility of soil erosion and water loss.

The tunnel 2 is located the middle part of the side wall of the pit body 1, and two rows of fixing holes 3 are respectively located above and below the tunnel 2, so that the upright posts 6 which are distributed in a straight line and at equal intervals are arranged at the side wall.

Referring to the accompanying drawing 4, two first-stage clamps 7 correspond to two mud plates 20, and a second-stage clamp 8 corresponds to the upper end of the pit body 1, a first-stage clamping opening 71 for sleeving the mud plates 20 is formed in each of the two first-stage clamps 7, a second-stage clamping opening 81 for sleeving the floor 25 is formed in each of the second-stage clamps 8, and the mud plates 20 and the floor 24 can be locked and fixed by screwing bolts on one side of the upright 6.

The connecting plate 15 is connected to one end of the inner rod 13 which penetrates through the buffer plate 11 in a sliding manner, and two ends of the secondary spring 14 sleeved on the inner rod 13 are respectively welded with the buffer plate 11 and the connecting plate 15.

The curb plate 16 is the slot-shaped structure, and curb plate 16 offsets with 2 inner walls in tunnel, and the filling has one-level concrete layer 18 in watering board 17 and the watering chamber 4, and has second grade concrete layer 24 between buffer board 11 and the mud slab 20, utilizes slot-shaped structure's curb plate 16 can carry out spacing support to 2 inner walls in tunnel.

The using method comprises the following steps:

step S1, opening two rows of fixing holes 3 positioned at the upper and lower positions of the tunnel 2 in the side wall of the pit body 1, fixedly nesting floor bolts 5 in the fixing holes 3, fixedly arranging upright posts 6 abutting against the side wall of the pit body 1 by using the free ends of the floor bolts 5, and performing limit support on the side wall of the pit body 1 by using the upright posts 6;

step S2, pressing the two connecting plates 15 up and down to conveniently vertically arrange the side plates 16 between the two connecting plates 15, embedding the pouring plates 17 outside the side plates 16 in the three pouring cavities 4, filling the first-stage concrete layer 18 into the pouring cavities 4 through the pouring plates 17, and fixing the pouring plates 17 in the inner wall of the tunnel 2 by using the first-stage concrete layer 18 so as to limit and support the side plates 16 and the inner wall of the tunnel 2;

step S3, arranging the horizontally distributed mud plates 20 by using the connecting rods 19, respectively sleeving one ends of the two mud plates 20 in the primary clamping openings 71 of the two primary clamps 7, and locking and fixing one ends of the mud plates 20 in the upright 6 by using bolts;

step S4, sleeving a frame 22 of a groove-shaped structure between two mud plates 20, sleeving sleeves 23 on the upper end and the lower end of the frame 22 in sleeves 21 on the two mud plates 20 respectively, locking and fixing the corresponding frame 22, the mud plates 20, side plates 16 and one end of a connecting plate 15 by using bolts in the inner end of the tunnel 2, filling a secondary concrete layer 24 between the buffer plate 11 and the mud plates 20, and firmly supporting the upper end and the lower end of the tunnel 2 by using the secondary concrete layer 24;

step S5, laying the floor 25 horizontally on the upper end of the pit body 1, so that one end of the floor 25 is sleeved in the second-stage clamping opening 81 of the second-stage clamp 8 and is locked and fixed by using bolts, specifically referring to the description of fig. 2, and then sleeving the limiting seats 27 on the upper end of the pit body 1 in the two adjacent bayonets 26 of the floor 25, and screwing the fixing bolts between the limiting seats 27 and the floor 25 to limit and fix the soil layer on the upper end of the pit body 1.

The floor plug 5 is horizontally inserted into the fixing hole 3 and the lower end of the upright post 6 is vertically inserted into the lower end of the pit body 1 in step S1 to ensure the stability of the upright post 6.

In steps S3 and S5, the height positions of the primary clamp 7 and the secondary clamp 8 can be adjusted up and down between two adjacent upright posts 6, so that the two primary clamps 7 horizontally correspond to the two mud plates 20 and the secondary clamp 8 horizontally corresponds to the floor 25, and the horizontal stability of the mud plates 20 and the floor 25 is ensured.

In step S4, the two ends of the sleeve 21 are connected with each other, and the end of the sleeve 23 extending out of the sleeve 21 is fixedly embedded in the secondary concrete layer 24.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A foundation pit supporting structure with tunnels on the side wall of a foundation pit comprises a pit body (1) and is characterized in that a tunnel (2) and two rows of fixing holes (3) are respectively formed in the side wall of the pit body (1), three watering cavities (4) are obliquely formed in the side wall of the tunnel (2), floor bolts (5) are fixedly sleeved in the two rows of fixing holes (3), stand columns (6) are fixedly connected to the floor bolts (5), and two primary clamps (7) and one secondary clamp (8) are respectively connected between every two adjacent stand columns (6);

the tunnel is characterized in that fixing plates (9) are fixedly nested on the inner walls of the upper end and the lower end of the tunnel (2), primary springs (10) are welded on the fixing plates (9), buffer plates (11) are welded on the primary springs (10), loop bars (12) are welded on the upper end and the lower end of the inner end of the tunnel (2), inner rods (13) are slidably sleeved in the loop bars (12), secondary springs (14) and connecting plates (15) are connected to the inner rods (13) respectively, the connecting plates (15) are connected to one ends, penetrating through the buffer plates (11), of the inner rods (13) in a sliding mode, and two ends of the secondary springs (14) sleeved on the inner rods (13) are welded with the buffer plates (11) and the connecting plates (15) respectively; side plates (16) are respectively connected between connecting plates (15) at the upper end and the lower end of the tunnel (2) and the mud plates (20), the side plates (16) are integrally connected with irrigation plates (17) sleeved in the irrigation cavity (4), two buffer plates (11) are respectively connected with connecting rods (19) through bolts, one sides of the primary clamps (7) corresponding to the side plates (16) are provided with the mud plates (20), one ends of the connecting rods (19) far away from the buffer plates (11) are fixedly connected with the mud plates (20), sleeves (21) are fixedly sleeved in the two mud plates (20), a frame (22) is sleeved between the two mud plates (20), and the upper end and the lower end of the frame (22) are respectively fixedly connected with sleeves (23) sleeved in the sleeves (21);

the upper end of the pit body (1) is horizontally paved with a floor (25), one end of the floor (25) is sleeved in the secondary clamp (8), a plurality of groups of two bayonets (26) which are one group are arranged in the floor (25), and limiting seats (27) which are positioned on the pit body (1) are sleeved in the bayonets (26).

2. The foundation pit supporting structure with the tunnel on the side wall of the foundation pit according to claim 1, wherein the tunnel (2) is positioned in the middle of the side wall of the pit body (1), and the two rows of fixing holes (3) are respectively positioned above and below the tunnel (2).

3. The foundation pit supporting structure with the tunnel on the side wall of the foundation pit according to claim 2, wherein two primary clamps (7) correspond to two mud plates (20) respectively, a secondary clamp (8) corresponds to the upper end of the pit body (1), a primary clamping opening (71) for sleeving the mud plates (20) is formed in each of the two primary clamps (7), and a secondary clamping opening (81) for sleeving the floor (25) is formed in each of the secondary clamps (8).

4. The foundation pit supporting structure with the tunnel on the side wall of the foundation pit as claimed in claim 2, wherein the side plates (16) are groove-shaped structures, the side plates (16) abut against the inner wall of the tunnel (2), the pouring plate (17) and the pouring cavity (4) are filled with a primary concrete layer (18), and a secondary concrete layer (24) is filled between the buffer plate (11) and the mud plate (20).

5. A method of using the excavation supporting structure with the tunnel on the side wall of the excavation as claimed in any one of claims 1 to 4, wherein the method of using comprises the steps of:

step S1, opening two rows of fixing holes (3) which are positioned above and below the tunnel (2) in the side wall of the pit body (1), fixedly nesting floor bolts (5) in the fixing holes (3), and fixedly arranging upright posts (6) which are abutted against the side wall of the pit body (1) by utilizing the free ends of the floor bolts (5);

s2, pressing the two connecting plates (15) up and down to conveniently vertically arrange the side plates (16) between the two connecting plates (15), nesting the pouring plates (17) outside the side plates (16) in the three pouring cavities (4), and filling the pouring cavities (4) with a primary concrete layer (18) through the pouring plates (17);

step S3, arranging horizontally distributed mud plates (20) by using connecting rods (19), respectively sleeving one ends of the two mud plates (20) in primary clamping openings (71) of two primary clamps (7), and locking and fixing one ends of the mud plates (20) in the upright posts (6) by using bolts;

step S4, sleeving a frame (22) with a groove-shaped structure between two mud plates (20), respectively sleeving sleeves (23) on the upper end and the lower end of the frame (22) in sleeves (21) on the two mud plates (20), locking and fixing the corresponding frame (22), the mud plates (20), side plates (16) and one end of a connecting plate (15) by using bolts in the inner end of the tunnel (2), and filling a secondary concrete layer (24) between the buffer plate (11) and the mud plates (20);

step S5, a floor (25) is horizontally laid on the upper end of the pit body (1), one end of the floor (25) is sleeved in a secondary clamping opening (81) on a secondary clamp (8) and locked and fixed by bolts, a limiting seat (27) positioned on the upper end of the pit body (1) is sleeved in two adjacent bayonets (26) of the floor (25), and the bolts are screwed between the limiting seat (27) and the floor (25).

6. The method for using the foundation pit supporting structure with the tunnel on the side wall of the foundation pit as claimed in claim 5, wherein the floor bolts (5) are horizontally inserted into the fixing holes (3) and the lower ends of the columns (6) are vertically inserted into the lower ends of the pit bodies (1) in the step S1.

7. The method for using the foundation pit supporting structure with the tunnel on the side wall of the foundation pit as claimed in claim 5, wherein in the step S3 and the step S5, the height positions of the primary clamp (7) and the secondary clamp (8) are adjusted up and down between two adjacent upright posts (6) so that the two primary clamps (7) and the two mud plates (20) and the two secondary clamps (8) horizontally correspond to the floor (25).

8. The method for using the foundation pit supporting structure with the tunnel on the side wall of the foundation pit as claimed in claim 5, wherein in the step S4, two ends of the sleeve (21) are communicated with each other, and one end of the sleeve (23) extending out of the sleeve (21) is fixedly embedded in the secondary concrete layer (24).