Foundation pit soil resource utilization construction method

Abstract

The application relates to the technical field of foundation pit soil and discloses a foundation pit soil resource utilization construction method, which comprises the following construction steps: 1) separating fine materials from coarse materials in foundation pit soil, mixing the fine materials with water to form mud slurry, and discharging the coarse materials along a vibrating screen; 2) crushing the coarse materials to form crushed materials; and making the crushed materials pass through multiple layers of screens to form powder materials; 3) making the mud slurry pass through pressing to form mud materials; 4) mixing and stirring the mud materials and the powder materials to form aggregates; 5) mixing and stirring the aggregates, cement and water to form mixed materials; 6) conveying the mixed materials to multiple mold cavities to perform vibration pressing to form green bricks; and 7) curing the green bricks for a set time to form finished bricks. The foundation pit soil generated in construction is processed layer by layer to form aggregates, the aggregates are mixed and stirred with cement and water to form mixed materials, the mixed materials are formed into green bricks in a table mold vibration press, the land utilization rate is improved, the environmental protection effect is improved, and the foundation pit soil is effectively treated.

Description

Technical Field

[0001] This invention patent relates to the technical field of foundation pit soil, and more specifically, to a construction method for the resource utilization of foundation pit soil. Background Technology

[0002] With the sustained and rapid growth of my country's economy and the booming development of the construction industry, the amount of various types of construction waste has been increasing year by year, among which the amount of soil from deep foundation pit excavation is becoming increasingly large.

[0003] The foundation pit soil also contains coarse and fine materials. Coarse materials generally refer to particles with a diameter greater than 4mm, with rounded gravel and angular gravel accounting for more than 50% of the mass. Fine materials are generally mainly plastic cake-shaped silty clay.

[0004] In existing technologies, with the popularization of comprehensive utilization of construction waste, the soil in the foundation pit is generally washed and filtered to separate coarse and fine materials. The fine material is formed into mud, which is then pressed to form mud cakes. The coarse material and mud are then transported off-site for landfilling. This not only results in a large amount of off-site transportation but also makes it difficult to achieve the effect of resource utilization of foundation pit soil, failing to meet the goals of green construction and resource treatment and reuse. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for the resource utilization of foundation pit soil, aiming to solve the problem that it is difficult to effectively treat foundation pit soil in the existing technology.

[0006] This invention is implemented as follows: a construction method for the resource utilization of foundation pit soil, comprising the following construction steps:

[0007] 1) The soil in the foundation pit is washed and filtered through a soil vibrating screen. The fine material in the foundation pit soil is mixed with water to form mud, which is discharged into a mud pit for later use. The coarse material in the foundation pit soil is discharged through the vibrating screen.

[0008] 2) The coarse material is placed in a crusher for crushing to form crushed material; the crushed material is then passed through multiple screening layers to form powder.

[0009] 3) The mud slurry is pressed through a press to remove water, forming mud material;

[0010] 4) Mix the mud and powder together to form aggregate;

[0011] 5) Mix the aggregate with cement and water to form a mixture;

[0012] 6) The mixture is conveyed to the mold of the table mold vibratory press, the mold having multiple cavities; the mixture placed in the mold cavity is vibrated and pressed to form a brick blank;

[0013] 7) Remove the brick blank from the mold, cure it for a set time, and form a finished brick.

[0014] Furthermore, in the construction step 1), a washing and filtering pool is arranged at the construction site, the soil vibrating screen is arranged above the washing and filtering pool, and a top water spray pipe is provided above the soil vibrating screen.

[0015] During the vibration transmission process of the foundation pit soil placed on the soil vibrating screen, water is sprayed downwards from the top water spray pipe. The water mixes with the foundation pit soil. The fine materials in the foundation pit soil and the water pass through the soil vibrating screen and are placed in the washing and filtering tank to form slurry. The coarse materials in the foundation pit soil are discharged along the soil vibrating screen.

[0016] Furthermore, the soil vibrating screen is equipped with a bottom water spray pipe arranged in a mesh pattern, and the bottom water spray pipe is distributed along the plane direction of the soil vibrating screen; in the construction step 1), when the foundation pit soil is placed on the soil vibrating screen for vibration transmission, the bottom water spray pipe sprays water intermittently from bottom to top to wash the foundation pit soil from bottom to top, and the top water spray pipe sprays water from top to bottom to wash the foundation pit soil from top to bottom.

[0017] Furthermore, in construction step 2), the crusher is a cone crusher, and the coarse material is placed in the cone crusher for crushing;

[0018] The cone crusher has a crushing chamber, the outer periphery of the middle part of the crushing chamber has a fixed crushing wall, the crushing chamber is provided with an eccentrically rotating cone head, and the outer periphery of the rotating cone head is provided with a rotating crushing wall;

[0019] Along the direction from bottom to top in the crushing chamber, the fixed crushing wall and the rotating crushing wall are respectively arranged inwardly at an angle. A crushing gap is formed between the fixed crushing wall and the movable crushing wall. The crushing gap is arranged around the outer periphery of the rotating cone. The middle part of the fixed crushing wall protrudes towards the movable crushing wall, forming a pointed bent protrusion. The bent protrusion is arranged around the outer periphery of the rotating cone.

[0020] In construction step 2), the coarse material is crushed by the compression of the fixed crushing wall and the movable crushing wall as it passes through the crushing interval from top to bottom, forming the crushed material.

[0021] Furthermore, in construction step 2), the crushed material is screened through a screening structure to form powder.

[0022] The screening structure includes multiple material vibrating screens arranged sequentially up and down, all of which are inclined and have vibrating screen holes; in the construction step 2), during the process of the crushed material being transported from top to bottom along the material vibrating screen, the crushed material with a diameter smaller than the vibrating screen hole falls through the vibrating screen hole to form the powder.

[0023] Furthermore, a return conveyor belt is provided between the material vibrating screen and the cone crusher.

[0024] In construction step 2), the crushed material that does not fall through the vibrating screen holes moves downward with the vibrating screen and falls onto the return conveyor belt, which then transports it back to the cone crusher.

[0025] Furthermore, in construction step 3), after the mud is fed into the mud press, flocculant is added to the mud and after it is left to stand for a set time, the mud is fed into the dewatering zone. In the dewatering zone, the mud is placed in two mesh belts that move in the same direction and moves synchronously with the mesh belts.

[0026] During the synchronous transmission of the mud along the conveyor belt, the mud is crushed by rolling rollers to form the mud material.

[0027] Furthermore, in construction step 4), the mud and powder are placed in a mixer and mixed to form the aggregate;

[0028] In construction step 5), the measured aggregate and cement are placed in a mixer. After the aggregate and cement are mixed and stirred in the mixer for a set time, a measured amount of water is injected into the mixer. The water is then mixed and stirred with the mixed aggregate and cement for a set time to form the mixture.

[0029] Furthermore, the table mold vibratory press is equipped with a vibrating table, a support plate on the vibrating table, and the mold placed on the support plate. The mold has multiple mold cavities arranged in an array. The mold is equipped with a pressure head, and the pressure head has multiple corresponding lower pressure plates inserted into the mold cavities.

[0030] In construction step 6), during the process of placing the mixture into multiple mold cavities, the vibrating table drives the mold to vibrate up and down and horizontally, and performs preliminary vibration and compression on the mixture placed in the mold cavity;

[0031] In construction step 6), after the mold cavity is filled with the mixture, the pressure head moves toward the mold until multiple lower pressure plates press down on the mixture in the mold cavity from top to bottom. The lower pressure plates apply downward static load pressure to the mixture. The vibration table drives the mold to vibrate up and down, and performs secondary vibration and pressure on the mixture in the mold cavity so that the mixture in the mold cavity forms a brick blank.

[0032] Furthermore, the vibration table is provided with a placement position for placing the tray, and the interior of the placement position is provided with a lower air chamber, which is connected to the air filling and suction device; the placement position is provided with multiple lower air holes, which are distributed throughout the placement position; a sealing ring is provided on the outer periphery of the placement position.

[0033] The pallet has multiple upper air chambers, and the bottom of the pallet has multiple vent holes, which are respectively connected to the multiple upper air chambers. The pallet has multiple brick support positions corresponding to the mold cavity, and the multiple brick support positions are respectively arranged vertically aligned with the multiple upper air chambers. The brick support positions have multiple upper air holes, which are connected to the upper air chambers.

[0034] In construction step 6), the pallet is placed on the placement position, and the bottom of the pallet abuts against the sealing ring to seal the outer periphery of the lower air chamber. The lower air chamber is connected to multiple upper air chambers through multiple vent holes.

[0035] In construction step 6), when the mixture is placed in the mold cavity, the upper air chamber is kept at normal pressure. When the lower pressure plate is inserted into the mold cavity and presses the mixture in the mold cavity downward, and the vibrating table drives the mold to vibrate up and down, the air filling and suction device injects high-pressure gas into the lower air chamber. The high-pressure gas presses the mixture from bottom to top through the upper air hole.

[0036] In construction step 7), during the process of the lower pressure plate removing the brick blank from the mold cavity, the air filling and suction device fills the lower air chamber with gas so that the upper air chamber forms a negative pressure state.

[0037] Compared with existing technologies ， The construction method for resource utilization of foundation pit soil provided by this invention involves washing and filtering the foundation pit soil generated during construction to form slurry and coarse material. The coarse material is crushed by a crusher and then screened through multiple layers to form powder. The slurry is pressed to form mud. The mud and powder are mixed to form aggregate. The aggregate is then mixed with cement and water to form a mixture. The mixture is formed into brick blanks in a vibratory press. After curing, the brick blanks become finished bricks. This method achieves the reuse of foundation pit soil, improves land use efficiency, and protects the environment, thus effectively treating foundation pit soil. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating the construction method for the resource utilization of foundation pit soil provided by the present invention.

[0039] Figure 2 This is a partial schematic diagram of the cone crusher provided by the present invention;

[0040] Figure 3 This is a front view schematic diagram of the table mold vibratory press provided by the present invention;

[0041] Figure 4 This is a front view schematic diagram of the separation of the pressure head and the mold provided by the present invention;

[0042] Figure 5 This is a front view schematic diagram of the cooperation between the pressure head and the mold provided by the present invention;

[0043] Figure 6 This is a cross-sectional schematic diagram of the vibration table and the support plate provided by the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0045] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0046] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0047] Reference Figure 1-6 The image shows a preferred embodiment of the present invention.

[0048] The construction method for resource utilization of foundation pit soil includes the following construction steps:

[0049] 1) The soil in the foundation pit is washed and filtered through a soil vibrating screen. The fine material in the foundation pit soil is mixed with water to form mud, which is discharged into a mud pit for later use. The coarse material 106 in the foundation pit soil is discharged through the vibrating screen.

[0050] 2) Place the coarse material 106 into a crusher for crushing to form crushed material 206; pass the crushed material 206 through multiple screens to form powder.

[0051] 3) The mud slurry is pressed through a press to remove the water, forming mud material;

[0052] 4) Mix the mud and powder together to form aggregate;

[0053] 5) Mix the aggregate with cement and water to form mixture 306;

[0054] 6) The mixture 306 is conveyed to the mold 301 of the table mold vibratory press, and the mold 301 has multiple mold cavities; the mixture 306 placed in the mold cavity is vibrated and pressed to form a brick blank;

[0055] 7) Remove the brick blank from mold 301, cure it for a set time, and form the finished brick.

[0056] The above-mentioned construction method for the resource utilization of foundation pit soil involves washing and filtering the foundation pit soil generated during construction to form mud and coarse material 106. The coarse material 106 is crushed by a crusher and then screened through multiple layers to form powder. The mud is pressed to form mud. The mud and powder are mixed to form aggregate. The aggregate is then mixed with cement and water to form mixture 306. The mixture 306 is formed into brick blanks in a vibratory press. After curing, the brick blanks become finished bricks. This method achieves the reuse of foundation pit soil, improves land use efficiency, and protects the environment, thus effectively treating foundation pit soil.

[0057] In this embodiment, in construction step 1), a washing and filtering pool is arranged at the construction site, a soil vibrating screen is arranged above the washing and filtering pool, and a top water spray pipe is provided above the soil vibrating screen.

[0058] During the vibration transmission process of the foundation pit soil on the soil vibrating screen, water is sprayed out from the top water spray pipe downwards. The water mixes with the foundation pit soil. The fine material in the foundation pit soil and the water pass through the soil vibrating screen and are placed in the washing and filtering tank to form mud. The coarse material 106 in the foundation pit soil is discharged along the soil vibrating screen.

[0059] The water sprayed from the top water pipe can break up the soil in the foundation pit. The fine materials in the foundation pit soil mix with cement to form mud, while the coarse materials 106 in the foundation pit soil are separated from the foundation pit soil.

[0060] In this embodiment, the soil vibrating screen is equipped with a bottom water spray pipe arranged in a mesh pattern, and the bottom water spray pipe is distributed along the plane direction of the soil vibrating screen; in construction step 1), when the foundation pit soil is placed on the soil vibrating screen for vibration transmission, the bottom water spray pipe sprays water intermittently from bottom to top to scour the foundation pit soil from bottom to top, and the top water spray pipe sprays water from top to bottom to scour the foundation pit soil from top to bottom.

[0061] In this way, the top and bottom water spray pipes spray water synchronously, and the bottom water spray pipe sprays water intermittently, which can create an up-and-down scouring effect on the foundation pit soil, making the foundation pit soil disperse faster and more efficiently, and mix more evenly with the water. The fine and coarse materials in the foundation pit soil are separated more quickly.

[0062] In this embodiment, in construction step 2), the crusher is a cone crusher 201, and the coarse material 106 is placed in the cone crusher 201 for crushing.

[0063] The cone crusher 201 has a crushing chamber, and a fixed crushing wall 2011 is provided on the outer periphery of the middle part of the crushing chamber. An eccentrically rotating rotating cone head 202 is provided in the crushing chamber, and a rotating crushing wall 2021 is provided on the outer periphery of the rotating cone head 202.

[0064] Along the direction from bottom to top in the crushing chamber, the fixed crushing wall 2011 and the rotating crushing wall 2021 are respectively arranged inwardly at an inward angle. A crushing gap 200 is formed between the fixed crushing wall 2011 and the movable crushing wall. The crushing gap 200 is arranged around the outer periphery of the rotating cone head 202. The middle part of the fixed crushing wall 2011 protrudes towards the movable crushing wall, forming a pointed bent protrusion. The bent protrusion is arranged around the outer periphery of the rotating cone head 202.

[0065] In construction step 2), as the coarse material 106 passes through the crushing interval 200 from top to bottom, the rotating cone head 202 rotates eccentrically. During the process of passing through the crushing interval 200, the coarse material 106 is crushed by the compression of the fixed crushing wall 2011 and the movable crushing wall, forming crushed material 206.

[0066] The cone crusher 201 can be the MPC-CS cone crusher 201, with a total power of 313kw, a processing capacity of 350t / h, and a maximum feed size of 210mm.

[0067] Before the coarse material 106 enters the cone crusher 201, the cone crusher 201 should be started under no-load. Only after confirming that the cone crusher 201 is operating normally can it begin operation. During the process of the coarse material 106 entering the cone crusher 201, a uniform feed rate should be maintained to prevent the coarse material 106 from accumulating, which would increase the load on the motor, causing excessive starting current and potentially burning out the motor.

[0068] In this embodiment, in construction step 2), the crushed material 206 is screened through a screening structure to form powder.

[0069] The screening structure includes multiple material vibrating screens arranged sequentially up and down, all of which are inclined and have vibrating screen holes; in the construction step 2), during the process of the crushed material 206 being transported from top to bottom along the material vibrating screen, the crushed material 206 with a diameter smaller than the vibrating screen hole falls through the vibrating screen hole to form powder.

[0070] The multi-layer vibrating screen can perform multi-layer screening of crushed material 206, and the materials after each layer of screening can be transferred accordingly, such as screening crushed stone first, then screening medium sand, and finally screening powder, etc. Using a vibrating motor as the excitation source, there is no transmission loss, the excitation force is stronger, the amplitude is larger, and the initial screening material is quickly screened step by step under the action of vibration.

[0071] A return conveyor belt is provided between the material vibrating screen and the cone crusher 201. In construction step 2), the crushed material 206 that does not fall through the holes of the vibrating screen moves downward with the material vibrating screen and falls onto the return conveyor belt, which then transports it back to the cone crusher 201.

[0072] In this embodiment, in construction step 3), after the mud is fed into the mud press, flocculant is added to the mud and it is left to stand for a set time before being fed into the dewatering zone. In the dewatering zone, the mud is placed in two mesh belts that move in the same direction and moves synchronously with the mesh belts.

[0073] During the synchronous transmission of the mud along the conveyor belt, the mud is crushed into mud material by rolling rollers.

[0074] After the mud is pumped into the press, a flocculant solution with a concentration of 0.05-0.1% is added and mixed with the mud. After the mixture reacts fully, the tiny solid particles (or suspended matter) in the mud agglomerate into larger flocculent clumps.

[0075] In construction step 4), the mud and powder are placed in a mixer and mixed to form aggregate.

[0076] In this embodiment, in construction step 5), the measured aggregate and cement are placed in a mixer. After the aggregate and cement are mixed and stirred in the mixer for a set time, the measured water is injected into the mixer. The water is then mixed and stirred with the mixed aggregate and cement for a set time to form a mixture 306.

[0077] Aggregates, cement, and water are mixed in a specific ratio to form a mixture 306. When cement comes into contact with water, it reacts to form hydrates and a paste, which carries the powder. As the hydration reaction of the cement continues, the water gradually decreases, the paste loses its plasticity and begins to solidify, and over time, crystals are formed.

[0078] The colloids and crystals intertwine to form a network. The colloids act as a binder, binding the powder together, while the powder and crystals act as a framework. All three grow together and are tightly bonded. After a certain period of curing, the strength of the cement gradually increases. Its setting and hardening process promotes the separation of the materials into solidified and strong particles, forming a dense and robust solid.

[0079] In this embodiment, the table mold vibratory press is provided with a vibrating table 300, a support plate 302 on the vibrating table 300, a mold 301 placed on the support plate 302, a plurality of mold cavities in the mold 301, the plurality of mold cavities being arranged in an array; a pressure head 400 is provided on the mold 301, and a plurality of lower pressure plates 401 corresponding to be inserted into the mold cavities are provided on the pressure head 400.

[0080] In construction step 6), during the process of placing the mixture 306 into multiple mold cavities, the vibrating table 300 drives the mold 301 to vibrate up and down and horizontally, and performs preliminary vibration and compression on the mixture 306 placed in the mold cavity.

[0081] In construction step 6), after the mold cavity is filled with the mixture 306, the press head 400 moves toward the mold 301 until multiple lower pressure plates 401 press down on the mixture 306 in the mold cavity from top to bottom. The lower pressure plates 401 apply downward static load pressure to the mixture 306. The vibrating table 300 drives the mold 301 to vibrate up and down, and performs secondary vibration and pressure on the mixture 306 in the mold cavity so that the mixture 306 in the mold cavity forms a brick blank.

[0082] In this embodiment, in construction step 7), after the brick blank has been formed in the mold cavity for a set time, the mold 301 and the pressure head 400 move upward away from the support plate 302, and the upward movement speed of the pressure head 400 is lower than the upward movement speed of the mold 301. Multiple lower pressure plates 401 detach the brick blank from the mold cavity, and the support plate 302 carries multiple brick blanks to a set position for curing.

[0083] The brick blanks are cured naturally, reaching their full strength in 28 days. The curing time is approximately 24 hours. Only after curing can the brick blanks be moved or removed from the pallet 302. The stacking height of the brick blanks should not exceed 1.3m.

[0084] In this embodiment, the vibration table 300 is provided with a placement position for the placement plate 302. The interior of the placement position is provided with a lower air chamber 601, which is connected to the air filling and suction device. The placement position is provided with multiple lower air holes 602, which are distributed throughout the placement position. A sealing ring 603 is provided on the outer periphery of the placement position.

[0085] The support plate 302 is provided with multiple upper air chambers 501, and the bottom of the support plate 302 is provided with multiple air holes 503, which are respectively connected to the multiple upper air chambers 501. The support plate 302 is provided with multiple brick support positions corresponding to the mold cavity, and the multiple brick support positions are respectively arranged vertically aligned with the multiple upper air chambers 501. The brick support positions are provided with multiple upper air holes 502, which are connected to the upper air chambers 501.

[0086] In construction step 6), the pallet 302 is placed on the placement position, and the bottom of the pallet 302 abuts against the sealing ring 603 to seal the outer periphery of the lower air chamber 601. The lower air chamber 601 is connected to the upper air chamber 501 through multiple vent holes 503.

[0087] In construction step 6), when the mixture 306 is placed in the mold cavity, the upper air chamber 501 is kept at normal pressure. When the lower pressure plate 401 is inserted into the mold cavity and presses down on the mixture 306 in the mold cavity, and the vibrating table 300 drives the mold 301 to vibrate up and down, the air filling and suction device injects high-pressure gas into the lower air chamber 601. The high-pressure gas presses the mixture 306 from bottom to top through the upper air hole 502.

[0088] In this way, during the process of vibrating and compacting the mixture 306, not only can the downward pressure of the lower platen 401 and the vibration of the vibrating table 300 make the mixture 306 compacted in the mold cavity, but the upward impact of high-pressure gas on the mixture 306 further compacts the mixture 306.

[0089] In construction step 7), during the process of the lower pressure plate 401 detaching the brick blank from the mold cavity, the air filling and suction device fills the lower air chamber 601 with gas so that the upper air chamber 501 forms a negative pressure state.

[0090] The upper air hole 502 can be used to adhere to the bottom of the brick blank, making it easier for the brick blank to be removed from the mold cavity. Of course, the diameter of the upper air hole 502 is small enough to prevent the mixture 306 from falling through the upper air hole 502. In addition, the mixture 306 forms a dense integral structure during the vibration and pressing process, and will not fall through the upper air hole 502.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for the resource utilization of foundation pit soil, characterized in that, The construction steps include the following: 1) The soil in the foundation pit is washed and filtered through a soil vibrating screen. The fine material in the foundation pit soil is mixed with water to form mud, which is discharged into a mud pit for later use. The coarse material in the foundation pit soil is discharged through the vibrating screen. 2) The coarse material is placed in a crusher for crushing to form crushed material; the crushed material is then passed through multiple screening layers to form powder. 3) The mud slurry is pressed through a press to remove water, forming mud material; 4) Mix the mud and powder together to form aggregate; 5) Mix the aggregate with cement and water to form a mixture; 6) The mixture is conveyed to the mold of the table mold vibratory press, the mold having multiple cavities; the mixture placed in the mold cavity is vibrated and pressed to form a brick blank; 7) Remove the brick blank from the mold, cure it for a set time, and form a finished brick; The table mold vibratory press is equipped with a vibrating table, a support plate on the vibrating table, and a mold placed on the support plate. The mold has multiple mold cavities arranged in an array. The mold is equipped with a pressure head, and the pressure head has multiple lower pressure plates that are correspondingly inserted into the mold cavities. In construction step 6), during the process of placing the mixture into multiple mold cavities, the vibrating table drives the mold to vibrate up and down and horizontally, and performs preliminary vibration and compression on the mixture placed in the mold cavity; In construction step 6), after the mold cavity is filled with the mixture, the pressure head moves toward the mold until multiple lower pressure plates press down on the mixture in the mold cavity from top to bottom. The lower pressure plates apply downward static load pressure to the mixture. The vibration table drives the mold to vibrate up and down, and performs secondary vibration and pressure on the mixture in the mold cavity so that the mixture in the mold cavity forms a brick blank. The vibration table is provided with a placement position for placing a tray, and the interior of the placement position is provided with a lower air chamber, which is connected to an air filling and suction device; the placement position is provided with multiple lower air holes, which are distributed throughout the placement position; a sealing ring is provided on the outer periphery of the placement position; The pallet has multiple upper air chambers, and the bottom of the pallet has multiple vent holes, which are respectively connected to the multiple upper air chambers. The pallet has multiple brick support positions corresponding to the mold cavity, and the multiple brick support positions are respectively arranged vertically aligned with the multiple upper air chambers. The brick support positions have multiple upper air holes, which are connected to the upper air chambers. In construction step 6), the pallet is placed on the placement position, and the bottom of the pallet abuts against the sealing ring to seal the outer periphery of the lower air chamber. The lower air chamber is connected to multiple upper air chambers through multiple vent holes. In construction step 6), when the mixture is placed in the mold cavity, the upper air chamber is kept at normal pressure. When the lower pressure plate is inserted into the mold cavity and presses the mixture in the mold cavity downward, and the vibrating table drives the mold to vibrate up and down, the air filling and suction device injects high-pressure gas into the lower air chamber. The high-pressure gas presses the mixture from bottom to top through the upper air hole. In construction step 7), during the process of the lower pressure plate removing the brick blank from the mold cavity, the air filling and suction device fills the lower air chamber with gas so that the upper air chamber forms a negative pressure state.

2. The construction method for resource utilization of foundation pit soil as described in claim 1, characterized in that, In construction step 1), a washing and filtering pool is arranged at the construction site, and the soil vibrating screen is arranged above the washing and filtering pool. A top water spray pipe is provided above the soil vibrating screen. During the vibration transmission process of the foundation pit soil placed on the soil vibrating screen, water is sprayed downwards from the top water spray pipe. The water mixes with the foundation pit soil. The fine materials in the foundation pit soil and the water pass through the soil vibrating screen and are placed in the washing and filtering tank to form slurry. The coarse materials in the foundation pit soil are discharged along the soil vibrating screen.

3. The construction method for resource utilization of foundation pit soil as described in claim 2, characterized in that, The soil vibrating screen is equipped with a bottom water spray pipe arranged in a mesh pattern, and the bottom water spray pipe is distributed along the plane direction of the soil vibrating screen; in the construction step 1), when the foundation pit soil is placed on the soil vibrating screen for vibration transmission, the bottom water spray pipe sprays water intermittently from bottom to top to wash the foundation pit soil from bottom to top, and the top water spray pipe sprays water from top to bottom to wash the foundation pit soil from top to bottom.

4. The construction method for resource utilization of foundation pit soil as described in any one of claims 1 to 3, characterized in that, In construction step 2), the crusher is a cone crusher, and the coarse material is placed in the cone crusher for crushing; The cone crusher has a crushing chamber, the outer periphery of the middle part of the crushing chamber has a fixed crushing wall, the crushing chamber is provided with an eccentrically rotating cone head, and the outer periphery of the rotating cone head is provided with a rotating crushing wall; Along the direction from bottom to top in the crushing chamber, the fixed crushing wall and the rotating crushing wall are respectively arranged inwardly at an angle, and a crushing gap is formed between the fixed crushing wall and the rotating crushing wall. The crushing gap is arranged around the outer periphery of the rotating cone. The middle part of the fixed crushing wall protrudes towards the rotating crushing wall, forming a pointed bent protrusion. The bent protrusion is arranged around the outer periphery of the rotating cone. In construction step 2), the coarse material is crushed by the compression of the fixed crushing wall and the rotating crushing wall as it passes through the crushing interval from top to bottom, forming the crushed material.

5. The construction method for resource utilization of foundation pit soil as described in any one of claims 1 to 3, characterized in that, In construction step 2), the crushed material is screened through a screening structure to form powder. The screening structure includes multiple material vibrating screens arranged sequentially up and down, all of which are inclined and have vibrating screen holes; in construction step 2), during the process of the crushed material being transported from top to bottom along the material vibrating screen, the crushed material with a diameter smaller than the vibrating screen hole falls through the vibrating screen hole to form the powder.

6. The construction method for resource utilization of foundation pit soil as described in claim 5, characterized in that, A return conveyor belt is provided between the vibrating screen and the cone crusher. In construction step 2), the crushed material that does not fall through the vibrating screen holes moves downward with the vibrating screen and falls onto the return conveyor belt, which then transports it back to the cone crusher.

7. The construction method for resource utilization of foundation pit soil as described in any one of claims 1 to 3, characterized in that, In construction step 3), after the mud is fed into the mud press, flocculant is added to the mud and it is left to stand for a set time before being fed into the dewatering zone. In the dewatering zone, the mud is placed in two mesh belts that move in the same direction and moves synchronously with the mesh belts. During the synchronous transmission of the mud along the conveyor belt, the mud is crushed by rolling rollers to form the mud material.

8. The construction method for resource utilization of foundation pit soil as described in any one of claims 1 to 3, characterized in that, In construction step 4), the mud and powder are placed in a mixer and mixed to form the aggregate; In construction step 5), the measured aggregate and cement are placed in a mixer. After the aggregate and cement are mixed and stirred in the mixer for a set time, a measured amount of water is injected into the mixer. The water is then mixed and stirred with the mixed aggregate and cement for a set time to form the mixture.

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