A soil solidification underground foundation structure and construction method thereof

Abstract

The present application relates to a soil solidification underground foundation structure and a construction method thereof, and belongs to the technical field of underground structures. It comprises a rectangular frame surrounded by a plurality of vertical side panels, wherein a plurality of bearing layers are arranged at intervals in the upper and lower parts of the rectangular frame, and each bearing layer comprises a plurality of horizontal plates arranged at intervals, and the two ends of the horizontal plates are fixedly connected to the side panels through connectors. The angle between the horizontal plates of the upper and lower adjacent bearing layers is 90°. The present application directly installs a rectangular frame with a plurality of bearing layers in the foundation pit, and backfills the materials in the rectangular frame layer by layer, thereby improving the foundation strength and not being affected by rainy weather.

Description

Technical Field

[0001] The present application belongs to the technical field of underground structures, and specifically relates to a soil solidification underground foundation structure and a construction method thereof. Background Art

[0002] When installing some accessories on the ground or temporarily fixing large lifting equipment, it is necessary to treat the ground to increase the strength of the ground to avoid ground subsidence and tilting of the lifting equipment when the large lifting equipment is in use. The current solution for foundation treatment is mainly to dig a pit, then backfill, compact the backfill soil, and then increase the foundation strength. This treatment method is not effective in the rainy season and is prone to loosening. Summary of the invention

[0003] The technical problem to be solved by the present application is: to overcome the shortcomings of the prior art and provide a soil solidification underground foundation structure and a construction method thereof. The present application directly installs a rectangular frame with several bearing layers inside the foundation pit, and backfills materials layer by layer inside the rectangular frame, thereby improving the foundation strength and not being affected by rainy weather.

[0004] The technical solution adopted by this application to solve the problems existing in the prior art is:

[0005] A soil solidification underground foundation structure comprises a rectangular frame surrounded by a plurality of vertical side plates, wherein a plurality of bearing layers are arranged at intervals up and down inside the rectangular frame, and each bearing layer comprises a plurality of horizontal plates arranged at intervals, wherein both ends of the horizontal plates are fixedly connected to the side plates through connectors.

[0006] The angle between the horizontal plates of the upper and lower adjacent bearing layers is 90°.

[0007] Preferably, two adjacent side panels are detachably connected via a connecting plate, a connecting pipe is provided at an end corner of the rectangular frame, and a side panel is detachably connected to two adjacent vertical surfaces of the connecting pipe.

[0008] Preferably, two L-shaped clamping plates arranged opposite to each other are convexly provided at both ends of the side plate, and clamping grooves are concavely provided at both ends of the connecting plate, and the clamping plates of the side plates on both sides of the connecting plate are clamped together in the clamping grooves.

[0009] Preferably, two adjacent end surfaces of the connecting pipe are convexly provided with plug plates, the included angle between the two plug plates is 90°, and the plug plates are inserted into the cavity between the two clamping plates on the same side of the side plate.

[0010] Preferably, the side plate is provided with a plurality of layers of first through holes.

[0011] A vertical plate is protruding from the end of the horizontal plate, a second through hole is provided on the vertical plate, and the connector is used to fix the horizontal plate and the side plate through the first through hole and the second through hole.

[0012] Preferably, the connector comprises a first plug rod and a second plug rod arranged coaxially, an end plate is provided at one end of the first plug rod facing away from the second plug rod, the outer diameter of the end plate is larger than the outer diameter of the first plug rod, the outer diameter of the first plug rod is larger than the outer diameter of the second plug rod, and the outer diameter of the first plug rod is the same as the inner diameter of the first through hole and the second through hole.

[0013] A plurality of layers of elastic anti-return devices are sleeved on the circumferential surface of the second insertion rod, and the anti-return devices include two states: a fitted state and an open state.

[0014] When the anti-return device is in the fitted state, it is in close contact with the second insertion rod, and the outer diameter of the anti-return device is smaller than the outer diameter of the first insertion rod.

[0015] When the anti-return device is in an open state, it opens into a truncated cone shape, and the end facing the end plate is a large end, and the outer diameter is larger than the outer diameter of the first insertion rod.

[0016] Preferably, the anti-return device comprises a plurality of spring plates, which are distributed in a ring array around the axis of the second insertion rod, and one end of the spring plate away from the end plate is connected to the circumferential surface of the second insertion rod.

[0017] Preferably, a cone head is coaxially fixedly connected to the end of the second insertion rod, and the outer diameter of the large end of the cone head is the same as the outer diameter of the second insertion rod.

[0018] A soil solidification construction method, including a soil solidification underground foundation structure, comprises the following steps:

[0019] S01. Use a total station to survey the site, determine the scope of the foundation, and use white lime to mark the lines;

[0020] S02. Dig a rectangular foundation pit with a depth of 2.8m-3.5m and compact the bottom of the foundation pit;

[0021] S03, erecting connecting pipes at the four corners of the rectangular foundation pit, and then plugging the side panels and the connecting plates in sequence, and assembling the side panels, the connecting plates and the connecting pipes into a rectangular frame inside the foundation pit;

[0022] S04, laying a bearing layer at the bottom of the rectangular frame, wherein the bottom of the horizontal plate of the bearing layer abuts against the bottom surface of the foundation pit;

[0023] S05. Backfill the material above the bearing layer and compact the material. After compaction, perform local leveling with weathered material;

[0024] S06, laying a bearing layer on the backfill material, repeating step S05 on the bearing layer, repeating steps S06 and S05 multiple times to form multiple bearing layers until the final height of the backfill material reaches the elevation;

[0025] S07. Carry out bearing capacity test on the treated foundation.

[0026] Preferably, the backfill material includes earth, rubble stone, concrete or cement.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The underground foundation is isolated from the external soil through a rectangular frame to prevent external soil erosion, rainwater erosion, etc. from affecting the underground foundation.

[0029] (2) The side panels 1, the connecting panels 2 and the connecting pipes 3 of the rectangular frame are detachably connected by plugging, which makes installation more convenient and reduces transportation costs.

[0030] (3) An anti-corrosion device with a sacrificial anode is connected to the outside of the rectangular frame to prevent corrosion of the rectangular frame and maintain the strength of the entire foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Figure 1 This is a first structural diagram of a soil solidification underground foundation structure of this application.

[0033] Figure 2 for Figure 1 A top view of

[0034] Figure 3 for Figure 1 A cross-sectional view of

[0035] Figure 4 This is a first structural diagram of a soil solidification underground foundation structure after being buried underground.

[0036] Figure 5 This is a structural diagram of the side plate connection in a soil solidification underground foundation structure of this application.

[0037] Figure 6 for Figure 5 A top view of

[0038] Figure 7 This is a side plate structure diagram of a soil solidification underground foundation structure for this application.

[0039] Figure 8 for Figure 7 Top view,

[0040] Fig. 9 This is a structural diagram of a connecting plate in a soil solidification underground foundation structure of this application.

[0041] Fig.10 for Fig. 9 A top view of

[0042] Fig.11 This is a structural diagram of a corner connection in a soil solidification underground foundation structure of this application.

[0043] Fig.12 for Fig.11 A top view of

[0044] Fig.13 This is a diagram of a connecting pipe structure in a soil solidification underground foundation structure of this application.

[0045] Fig.14 for Fig.13 A top view of

[0046] Fig.15 This is a structural diagram of a transverse connection in a soil solidification underground foundation structure of this application.

[0047] Fig.16 This is a horizontal plate structure diagram of a soil solidification underground foundation structure in this application.

[0048] Fig.17 This is a structural diagram of a connector in a soil solidification underground foundation structure of this application.

[0049] Fig.18 This is a second structural diagram of a soil solidification underground foundation structure of this application.

[0050] Fig.19 This is a second structural diagram of a soil solidification underground foundation structure after being buried underground.

[0051] Fig. 20 for Fig.18 Exploded view,

[0052] Fig.21 This is an exploded view of the corner of the upper cover of a soil solidification underground foundation structure of this application.

[0053] Fig. 22 This is a sensor arrangement diagram in a soil solidification underground foundation structure of this application.

[0054] Fig.23 This is a connection structure diagram of an anti-corrosion device in a soil solidification underground foundation structure of this application.

[0055] Fig.24 This is a structural diagram of an anti-corrosion device in a soil solidification underground foundation structure of this application.

[0056] Fig.25 for Fig.24 A partial enlarged view of the middle A.

[0057] Fig.26 for Fig.23 Sectional view,

[0058] Fig. 27 for Fig.24 Section view.

[0059] In the figure: 1-side plate, 101-card plate, 102-first through hole, 2-connecting plate, 201-card slot, 3-connecting pipe, 301-plug plate, 4-horizontal plate, 401-vertical plate, 402-second through hole, 5-connector, 501-first plug rod, 502-end plate, 503-second plug rod, 504-spring clip, 505-cone head, 6-U-shaped channel steel, 7-right angle tube, 701-plug rod, 8-square tube, 9-earth pressure gauge, 10-soil moisture sensor, 11-sacrificial anode, 1101-gasket, 12-connecting block, 13-first nut, 14-wire, 15-vertical rod, 16-connecting rod, 17-inner pad, 18-second nut, 01-first layer of backfill, 02-second layer of backfill, 03-third layer of backfill, 04-fourth layer of backfill. DETAILED DESCRIPTION

[0060] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0061] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present application.

[0062] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] The following is a further detailed description of a soil solidification underground foundation structure and a construction method of the present application in conjunction with the accompanying drawings, but it is not intended to limit the present application.

[0064] A soil solidification underground foundation structure, comprising Figures 1 to 17 As shown, it includes a rectangular frame formed by a plurality of vertical side panels 1, a plurality of bearing layers are arranged at intervals in the upper and lower parts of the rectangular frame, each bearing layer includes a plurality of horizontal plates 4 arranged at intervals, and both ends of the horizontal plates 4 are fixedly connected to the side panels 1 through connectors 5, and the angle between the horizontal plates 4 of the upper and lower adjacent bearing layers is 90°.

[0065] The entire rectangular frame is buried inside the underground foundation pit, and then the material is backfilled layer by layer on the bearing layer to fix the entire rectangular frame in the foundation pit to form a solid underground foundation so that accessories can be added to the underground foundation later.

[0066] The side panels 1 form a tight rectangular frame side wall, which is used to isolate the underground foundation inside the rectangular frame from the external soil, so as to prevent external soil erosion, rainwater erosion, etc. from affecting the underground foundation.

[0067] In this embodiment, the rectangular frame mainly includes a side plate 1, a connecting plate 2 and a connecting pipe 3. Two adjacent side plates 1 are detachably connected through the connecting plate 2. The connecting pipe 3 is provided at the end corner of the rectangular frame. Fig.11 as well as Fig.12 As shown, two adjacent vertical surfaces of the connecting pipe 3 are detachably connected to a side plate 1. The side plate 1 and the connecting plate 2 as well as the side plate 1 and the connecting pipe 3 are detachably connected, which is convenient for the transportation of parts and components and can be assembled inside the excavated foundation pit, thereby improving assembly efficiency and reducing transportation costs.

[0068] In order to further facilitate disassembly and assembly, in this embodiment, Figure 6 , Figure 8 as well as Fig.10 As shown, two L-shaped clamping plates 101 arranged opposite to each other are convexly provided at both ends of the side plate 1 , and clamping grooves 201 are concavely provided at both ends of the connecting plate 2 , and the clamping plates 101 of the side plates 1 on both sides of the connecting plate 2 are clamped together in the clamping grooves 201 .

[0069] Two adjacent end surfaces of the connecting pipe 3 are convexly provided with plug plates 301 , the included angle between the two plug plates 301 is 90°, and the plug plates 301 are inserted into the cavity between the two clamping plates 101 on the same side of the side plate 1 .

[0070] In this way, the side panel 1, the connecting plate 2 and the connecting pipe 3 are connected by plugging, which makes installation more convenient and positioning more accurate.

[0071] The side plate 1 is provided with a plurality of first through holes 102. The end of the horizontal plate 4 is provided with a vertical plate 401, and the vertical plate 401 is provided with a second through hole 402. The connector 5 is used to fix the horizontal plate 4 and the side plate 1 through the first through hole 102 and the second through hole 402.

[0072] Depend on Fig.17 As shown, the connector 5 includes a coaxially arranged first plug rod 501 and a second plug rod 503, an end plate 502 is provided at one end of the first plug rod 501 away from the second plug rod 503, the outer diameter of the end plate 502 is larger than the outer diameter of the first plug rod 501, the outer diameter of the first plug rod 501 is larger than the outer diameter of the second plug rod 503, and the outer diameter of the first plug rod 501 is the same as the inner diameter of the first through hole 102 and the second through hole 402.

[0073] The circumferential surface of the second insertion rod 503 is sleeved with a plurality of layers of elastic anti-return devices, and the anti-return devices include two states: a fitted state and an open state.

[0074] When the anti-return device is in the fitted state, it is in close contact with the second insertion rod 503, and the outer diameter of the anti-return device is smaller than the outer diameter of the first insertion rod 501;

[0075] When the anti-return device is in the open state, it opens into a frustum, and the end facing the end plate 502 is the large end, and the outer diameter is larger than the outer diameter of the first insertion rod 501 .

[0076] In this embodiment, the anti-return device includes a plurality of inclined spring pieces 504 , which are distributed in a ring array around the axis of the second plug rod 503 , and one end of the spring piece 504 away from the end plate 502 is connected to the circumferential surface of the second plug rod 503 .

[0077] The end of the second insertion rod 503 is coaxially fixedly connected with a cone head 505 , and the outer diameter of the larger end of the cone head 505 is the same as the outer diameter of the second insertion rod 503 .

[0078] When in use, the cone head 505 of the connector 5 is passed through the second through hole 402 and the first through hole 102 in sequence. During the penetration process, the spring sheet 504 is elastic and is pressed down during the penetration process, and fits with the second insertion rod 503, and then can pass through the second through hole 402 and the first through hole 102. After passing through the first through hole 102, the spring sheet 504 opens under the action of elastic force. The cone head 505 is inserted into the soil outside the rectangular frame. Under the action of the squeezing force of the soil, the soil wraps the anti-return device. Since the spring sheet 504 opens in an umbrella shape, it can effectively play a anti-return effect and prevent the connector 5 from loosening.

[0079] In this embodiment, the end plate 502 is threadedly connected to the first insertion rod 501. When the horizontal plate 4 needs to be removed, the lower end plate 502 can be rotated, and then the first insertion rod 501 can be hammered into the outside of the rectangular frame to complete the separation of the horizontal plate 4 and the side plate 1.

[0080] Since the entire rectangular frame needs to be buried deep underground in a humid environment, corrosion is likely to occur, and if corrosion is severe, the strength of the entire foundation will be affected. In order to prevent the rectangular frame from corroding, in this embodiment, an anti-corrosion device is connected to the outside of the rectangular frame.

[0081] Depend on Figure 23 to Figure 27 As shown, the anti-corrosion device comprises a sacrificial anode 11, a connecting block 12, a first nut 13, a wire 14, a vertical rod 15, a connecting rod 16 and a second nut 18. In this embodiment, the sacrificial anode 11 is a magnesium alloy sacrificial anode, specifically a magnesium rod with a screw rod passing through the middle.

[0082] The connection block 12 is provided with a plurality of through holes, and the screw exposed above the sacrificial anode 11 passes through the through hole. A gasket 1101 is sleeved on the screw located inside the through hole, and a first nut 13 is threadedly connected to the screw. The first nut 13 presses the gasket 1101 to ensure the abutment between the sacrificial anode 11 and the connection block 12.

[0083] At the same time, one connection block 12 is connected to 1 to 7 vertically arranged sacrificial anodes 11. The connection block 12 is conductively connected to the vertical rod 15 through the wire 14. The vertical rod 15 is inserted into the cavity in the side plate 1, or arranged inside the rectangular frame. A number of horizontally arranged connecting rods 16 are fixed on the vertical rod 15. The connecting rod 16 is sleeved with an inner side pad 17. The connecting rod 16 passes through the first through hole 102 on the side plate 1. The connecting rod 16 adopts a screw rod, on which a second nut 18 is threadedly connected. The second nut 18 and the inner side pad 17 clamp the outer wall of the side plate 1 together to achieve a fixed connection between the connecting rod 16 and the side plate 1. At the same time, the two are in contact and can conduct electricity.

[0084] The entire anti-corrosion device is buried outside the rectangular frame in the soil which is convenient for excavation, so as to facilitate the regular replacement of the sacrificial anode 11 .

[0085] A soil solidification construction method includes the above-mentioned soil solidification underground foundation structure, and the steps are as follows:

[0086] S01. Use a total station to survey the site, determine the scope of the foundation, and use white lime to mark the lines;

[0087] S02. Dig a rectangular foundation pit with a depth of 2.8m-3.5m and compact the bottom of the foundation pit;

[0088] S03, erecting connecting pipes 3 at the four corners of the rectangular foundation pit, and then plugging the side panels 1 and the connecting plates 2 in sequence, and assembling the side panels 1, the connecting plates 2 and the connecting pipes 3 into a rectangular frame inside the foundation pit;

[0089] S04, laying a bearing layer at the bottom of the rectangular frame, the bottom of the horizontal plate 4 of the bearing layer abuts against the bottom surface of the foundation pit;

[0090] S05. Backfill the material above the bearing layer and compact the material. After compaction, perform local leveling with weathered material;

[0091] S06, laying a bearing layer on the backfill material, repeating step S05 on the bearing layer, repeating steps S06 and S05 multiple times to form multiple bearing layers until the final height of the backfill material reaches the elevation;

[0092] S07. Carry out bearing capacity test on the treated foundation.

[0093] The backfill materials include earth, rough stone, concrete or cement. The backfill materials on each bearing layer in this application have the following forms:

[0094] The first type: the backfill above each bearing layer is made of soil excavated from the foundation pit. This backfill form is all done through the soil, so it is necessary to pay attention to the impact of rainy weather on the foundation strength. Using this backfill form, in this embodiment, an earth pressure gauge 9 is set in the gap between the horizontal plates of each bearing layer, and at least two earth pressure gauges 9 are set for each bearing layer. The wire of the earth pressure gauge 9 passes through the first through hole 102 of the side plate 1 to the cavity in the middle of the side plate 1, and then is arranged upward through the cavity until the side plate 1 is exposed.

[0095] In order to monitor whether there is water seepage at the bottom of the foundation pit in real time, a soil moisture sensor 10 is provided at the bottom of the foundation pit. The wire of the soil moisture sensor 10 also passes through the first through hole 102 of the side plate 1 into the cavity in the middle of the side plate 1, and then is arranged upward through the cavity until the side plate 1 is exposed.

[0096] The wires of the soil pressure gauge 9 and the soil moisture sensor 10 are finally connected to the ground control box after being gathered. To this end, in this embodiment, a wire box is provided above the rectangular frame, and the wire box includes an inverted U-shaped channel steel 6, a right angle tube 7 connecting two adjacent U-shaped channel steels 6 arranged at 90 degrees, and a plug rod 701 is fixed at the bottom of the right angle tube 7, and the plug rod 701 is inserted into the cavity in the middle of the connecting tube 3.

[0097] A square tube 8 is inserted between the right-angle tube 7 and the U-shaped channel steel 6 to improve the connection strength between the two. The wire is inserted into the U-shaped channel steel 6, and a threading hole is opened on the outside of the U-shaped channel steel 6 to facilitate the wire to pass through. Through the arrangement of the wire box, the direction of the wire can be planned, the site is not messy, and it also protects the wire from being pressed.

[0098] The advantage of this arrangement is that it is easy to recycle and reuse later.

[0099] The second type: by Figure 4 As shown, the bearing layer inside the rectangular frame divides the backfill into a first backfill layer 01, a second backfill layer 02, a third backfill layer 03 and a fourth backfill layer 04. A mixture of construction waste and concrete or cement is backfilled inside the first backfill layer 01, and then cement is used for leveling. After hardening, other backfills, including earth or concrete or cement, are backfilled in the second backfill layer 02, the third backfill layer 03 and the fourth backfill layer 04.

[0100] The rectangular frame is directly isolated from the bottom of the foundation pit by the first layer of backfill 01, thereby preventing bottom water seepage.

[0101] The implementation methods of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A soil solidification underground foundation structure, characterized in that: It comprises a rectangular frame formed by a plurality of vertical side panels (1), wherein a plurality of bearing layers are arranged at intervals in the upper and lower parts of the rectangular frame, and each bearing layer comprises a plurality of horizontal panels (4) arranged at intervals, and both ends of the horizontal panels (4) are fixedly connected to the side panels (1) via connectors (5); The angle between the horizontal plates (4) of the upper and lower adjacent bearing layers is 90°; Two adjacent side panels (1) are detachably connected via a connecting plate (2); a connecting pipe (3) is provided at an end corner of the rectangular frame; and a side panel (1) is detachably connected to two adjacent vertical surfaces of the connecting pipe (3); The side plate (1) is provided with a plurality of layers of first through holes (102); The end of the horizontal plate (4) is provided with a vertical plate (401), the vertical plate (401) is provided with a second through hole (402), and the connector (5) is used to fix the horizontal plate (4) and the side plate (1) via the first through hole (102) and the second through hole (402); The connector (5) comprises a first plug rod (501) and a second plug rod (503) which are coaxially arranged; an end plate (502) is provided at one end of the first plug rod (501) which is away from the second plug rod (503); the outer diameter of the end plate (502) is larger than the outer diameter of the first plug rod (501); the end plate (502) is threadedly connected to the first plug rod (501); the outer diameter of the first plug rod (501) is larger than the outer diameter of the second plug rod (503); the outer diameter of the first plug rod (501) is the same as the inner diameter of the first through hole (102) and the second through hole (402); The circumferential surface of the second insertion rod (503) is sleeved with a plurality of layers of elastic anti-return devices, the anti-return devices having two states: a fitted state and an open state; When the anti-return device is in a fitted state, it is tightly attached to the second insertion rod (503), and the outer diameter of the anti-return device is smaller than the outer diameter of the first insertion rod (501); When the anti-return device is in an open state, it opens into a truncated cone shape, and the end facing the end plate (502) is a large end, and the outer diameter is larger than the outer diameter of the first insertion rod (501); The anti-return device comprises a plurality of spring pieces (504), the spring pieces (504) being distributed in a ring array around the axis of the second insertion rod (503), and one end of the spring piece (504) facing away from the end plate (502) being connected to the circumferential surface of the second insertion rod (503); An anti-corrosion device is connected in the soil outside the rectangular frame for easy excavation, the anti-corrosion device comprising a sacrificial anode (11), a connecting block (12), a first nut (13), a wire (14), a vertical rod (15), a connecting rod (16) and a second nut (18); The sacrificial anode (11) is in contact with the connecting block (12); the connecting block (12) is conductively connected to the vertical rod (15) via a wire (14); the vertical rod (15) is inserted into a cavity in the side plate (1); a plurality of horizontally arranged connecting rods (16) are fixed to the vertical rod (15); an inner pad (17) is sleeved on the connecting rod (16); the connecting rod (16) passes through a first through hole (102) on the side plate (1); the connecting rod (16) is a screw rod, on which a second nut (18) is threadedly connected; the second nut (18) and the inner pad (17) together clamp the outer wall of the side plate (1).

2. The soil solidification underground foundation structure according to claim 1, characterized in that: Two L-shaped clamping plates (101) are convexly provided at both ends of the side plate (1) and are arranged opposite to each other. Clamping grooves (201) are concavely provided at both ends of the connecting plate (2). The clamping plates (101) of the side plates (1) on both sides of the connecting plate (2) are clamped together inside the clamping grooves (201).

3. The soil solidification underground foundation structure according to claim 2, characterized in that: Two adjacent end surfaces of the connecting pipe (3) are provided with plug plates (301) protruding therefrom, the included angle between the two plug plates (301) is 90°, and the plug plates (301) are inserted into the cavity between two clamping plates (101) on the same side of the side plate (1).

4. The soil solidification underground foundation structure according to claim 3, characterized in that: The end of the second insertion rod (503) is coaxially fixedly connected with a cone head (505), and the outer diameter of the large end of the cone head (505) is the same as the outer diameter of the second insertion rod (503).

5. A soil solidification construction method, comprising a soil solidification underground foundation structure according to claim 4, characterized in that: The following steps are involved: S01. Use a total station to survey the site, determine the scope of the foundation, and use white lime to mark the lines; S02. Dig a rectangular foundation pit with a depth of 2.8m-3.5m and compact the bottom of the foundation pit; S03, connecting pipes (3) are erected at the four corners of the rectangular foundation pit, and then the side panels (1) and the connecting plates (2) are plugged in one by one, and a rectangular frame is assembled inside the foundation pit through the side panels (1), the connecting plates (2) and the connecting pipes (3); S04, laying a bearing layer at the bottom of the rectangular frame, wherein the bottom of the horizontal plate (4) of the bearing layer abuts against the bottom surface of the foundation pit; S05. Backfill the material above the bearing layer and compact the material. After compaction, perform local leveling with weathered material; S06, laying a bearing layer on the backfill material, repeating step S05 on the bearing layer, repeating steps S06 and S05 multiple times to form multiple bearing layers until the final height of the backfill material reaches the elevation; S07. Carry out bearing capacity test on the treated foundation.

6. A soil solidification construction method according to claim 5, characterized in that: The backfill material includes earth, rough stone, concrete or cement.

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