Expansive soil roadbed stabilizing structure and construction method

Abstract

The invention discloses an expansive soil roadbed stabilizing structure and a construction method, and relates to the technical field of engineering construction, the expansive soil roadbed stabilizing structure comprises a water-resisting layer laid on a foundation, a reinforced layer is arranged above the water-resisting layer, and an improved soil layer is arranged above the reinforced layer. In the construction process of the expansive soil roadbed stabilizing structure, foundation treatment is firstly carried out to ensure the stability of the foundation, then the water-resisting layer is laid to prevent surface water from permeating into the roadbed in the construction process, then construction of the improved soil layer is carried out, in the construction process of the improved soil layer, the reinforced layers are laid in a layered mode, and finally construction of the drainage system is carried out. According to the expansive soil roadbed stabilizing structure, the drainage facility is completed before the roadbed main body engineering, so that accumulated water is drained in time in the construction process, in the construction process, the reinforced layer is prevented from tilting in the laying process through the extrusion assembly and the pressure assembly, and stable use of the expansive soil roadbed stabilizing structure is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction, and particularly to a swelling soil subgrade stability structure and a construction method therefor. Background Technique

[0002] Swelling soil is a special soil rich in hydrophilic clay minerals (such as montmorillonite, illite, etc.), which has the characteristics of swelling when encountering water and shrinking when losing water, and the swelling and shrinking deformation is repetitive. The swelling soil subgrade stability structure is a series of engineering structure measures designed for this characteristic of swelling soil, aiming to restrain the swelling and shrinking deformation of swelling soil, prevent the roadbed from being damaged due to the volume change of swelling soil, and ensure the stability of the roadbed during long-term use.

[0003] The principle of the swelling soil subgrade stability structure is mainly to achieve stability by changing the physical environment and mechanical state of swelling soil. On the one hand, isolation measures are adopted to prevent water from entering the swelling soil subgrade, reducing the inducement of its swelling and shrinking deformation; on the other hand, the overall strength and deformation resistance of the swelling soil subgrade are enhanced through reinforcement and restraint structures. For example, setting a water isolation layer can prevent surface water from seeping into the roadbed, while the reinforcement material can improve the tensile strength of the roadbed and restrain the lateral deformation of swelling soil.

[0004] The swelling soil subgrade stability structure generally consists of a water isolation layer, a reinforcement layer and a modified soil layer. During the construction process, first, the foundation is treated to ensure the stability of the foundation, then the water isolation layer is laid to prevent surface water from seeping into the roadbed during construction, and then the construction of the modified soil layer is carried out. If lime or cement is used for modification, attention should be paid to the uniform mixing of materials to ensure the modification effect. During or after the construction of the modified soil layer, the reinforcement layer is laid in layers, and it is ensured that the reinforcement material is closely combined with the soil mass. Finally, the construction of the drainage system is carried out, and the drainage facilities should be completed prior to the main roadbed project to timely drain the accumulated water during construction. For example, in a new swelling soil subgrade project, first, the original foundation is compacted and leveled, etc., then a geomembrane water isolation layer is laid, then lime and swelling soil are uniformly mixed in proportion and filled in layers, and the thickness of each filling layer does not exceed the specified value. During the filling process of each layer of soil, a geogrid reinforcement layer is laid, and finally drainage facilities such as side ditches and blind ditches are built.

[0005] During the process of laying and constructing the reinforcement layer on the water isolation layer, due to improper operation, the laid reinforcement layer will be warped and wrinkled, resulting in stress concentration, affecting the stable use of the swelling soil subgrade stability structure. For this reason, we propose a swelling soil subgrade stability structure and a construction method therefor. Summary of the Invention

[0006] The purpose of the present invention is to provide a swelling soil subgrade stability structure and a construction method therefor, so as to solve the problems raised in the above background technique.

[0007] To achieve the above object, the present invention provides the following technical solution: A swelling soil subgrade stability structure, characterized in that it includes a waterproof layer laid on the foundation;

[0008] Above the waterproof layer, there is a reinforced layer, above the reinforced layer, there is a modified soil layer. The reinforced layer is a geogrid. Between the waterproof layer and the reinforced layer, there is a positioning component for assisting in positioning during the laying process of the reinforced layer and an extrusion component for preventing wrinkles and extruding the reinforced layer during the positioning process. Above the reinforced layer, there is a pressure component for preventing the reinforced layer from warping up after laying.

[0009] In a more optimal solution: The positioning component includes positioning grooves evenly distributed around the reinforced layer. Multiple groups of positioning blocks respectively inserted and positioned with each group of positioning grooves are fixed in the waterproof layer. The positioning blocks are exposed above the waterproof layer, and the positioning blocks and the positioning grooves are matched with each other.

[0010] In a more optimal solution: The extrusion component includes an installation groove opened on the positioning block. A pressing plate is slidably connected to the installation groove. An expansion and contraction component for telescopically connecting the pressing plate is arranged inside the installation groove. On one side of the pressing plate, there is an inclined surface for abutting and transmitting with the inner wall of the positioning groove.

[0011] In a more optimal solution: The expansion and contraction component includes multiple groups of first sleeves fixed inside the installation groove. A first sliding rod is slidably connected to each group of first sleeves. One end of the first sliding rod is fixed to one side of the pressing plate. A first spring is sleeved outside the first sleeve, and both ends of the first spring abut against the inner wall of the installation groove and the pressing plate respectively.

[0012] In a more optimal solution: Multiple groups of pressure components are provided, and each group of pressure components is evenly distributed around the upper part of the reinforced layer. The pressure component includes a lifting plate arranged above the reinforced layer. Between the lifting plate and the reinforced layer, there is a pressure plate for extruding and pushing the reinforced layer. Between the pressure plate and the lifting plate, there is an elastic force component for elastically connecting the pressure plate. On the reinforced layer, there is a sliding component for assisting the slidable connection of the lifting plate, and on the reinforced layer, there is a transmission component for transmitting to the lifting plate.

[0013] In a more optimal solution: The elastic force component includes multiple groups of second sleeves fixed on the pressure plate. A second sliding rod is slidably connected to the second sleeve. One end of the second sliding rod is fixed to the lifting plate. A second spring is sleeved outside the second sleeve, and both ends of the second spring are respectively connected to the lifting plate and the pressure plate.

[0014] In a more optimal solution: The sliding component includes two sets of symmetrically arranged mounting rods slidably connected to the lifting plate. One end of the mounting rod is fixed to the upper end of the reinforcing layer, and a strip-shaped plate is fixed to the other end of the mounting rod.

[0015] In a more optimal solution: The transmission component includes a mounting frame centered at the upper end of the reinforcing layer. A rectangular plate is connected to the mounting frame through a connecting component, and a transmission plate is fixedly connected between the rectangular plate and the lifting plate;

[0016] A connecting structure with its top exposed is installed inside the isolation layer. A plurality of circumferentially distributed connecting flaps are installed on the top of the connecting structure, and connecting claws are arranged on the inner wall of the connecting flaps;

[0017] The bottom of the mounting frame is provided with a connecting hole that is large at the top and small at the bottom. An expansion body is installed in the connecting hole, and a connecting groove is installed on the outer wall of the expansion body. The connecting groove and the connecting claw are unidirectionally connected and hooked.

[0018] In a more optimal solution: The connecting component includes multiple groups of third sleeves fixed inside the mounting frame. A third sliding rod is slidably connected to the third sleeve. One end of the third sliding rod is fixed to the rectangular plate, and a third spring is sleeved outside the third sleeve. The two ends of the third spring are respectively connected to the inner wall of the mounting frame and the rectangular plate.

[0019] A construction method for a swelling soil subgrade stability structure includes the following steps:

[0020] S1: During the construction of the swelling soil subgrade stability structure, first perform foundation treatment to ensure the stability of the foundation, then lay a waterproof layer to prevent surface water from seeping into the subgrade during construction. Then, carry out the construction of the improved soil layer. During the construction of the improved soil layer, lay the reinforcing layer in layers. Finally, carry out the construction of the drainage system. The drainage facilities should be completed prior to the main subgrade project to timely drain the accumulated water during construction;

[0021] S2: During the process of laying the reinforcing layer on the waterproof layer, make each group of positioning grooves on the reinforcing layer respectively abut and align with each group of positioning blocks on the waterproof layer. Through the interaction between each group of positioning grooves and positioning blocks, position the laying of the reinforcing layer to facilitate a more accurate laying operation of the reinforcing layer;

[0022] S3: And during the process of positioning the laying of the reinforcing layer through the positioning grooves and positioning blocks, as the positioning blocks move towards the inside of the positioning grooves, the inclined surface of the extrusion plate abuts against the inside of the positioning grooves. During the abutting process, push the extrusion plate to move towards the inside of the positioning grooves under force. During the movement of the extrusion plate, push each group of first sliding rods to slide on each group of first sleeves respectively and make the first spring deform under force to generate elastic force;

[0023] S4: After the positioning and laying of the reinforced layer, through the extrusion and pushing action of the first spring on the extrusion plate, the extrusion plates on each group of positioning blocks are abutted against the inner wall of the positioning groove. Through the abutting and extrusion action, the periphery of the laid reinforced layer is extruded and pushed. Through the extrusion and pushing action, the corners of the reinforced layer during laying are prevented from warping.

[0024] S5: During the laying process of the improved soil layer after the laying of the reinforced layer, through the pressure action of the laid improved soil layer on the rectangular plate on the installation frame, the rectangular plate is pushed to move towards the inside of the installation frame under force. During the movement, each group of transmission plates respectively push each group of lifting plates to move towards the reinforced layer.

[0025] S6: During the process of the lifting plate moving towards the reinforced layer, through the connection action of the elastic component, the pressure plate is driven to abut against the upper edge side of the reinforced layer. Through the extrusion action on the reinforced layer, the corners of the laid reinforced layer are prevented from warping, ensuring the flatness of the laid reinforced layer, and further ensuring the stable use of the stable structure of the expansive soil subgrade.

[0026] S7: When the pressure plate abuts against the upper end of the reinforced layer due to the descent of the pressure plate, as the lifting plate continues to descend, the lifting plate moves towards the pressure plate that is abutted and limited. During the movement, each group of second sliding rods are respectively pushed to slide on each group of second sleeves and the second spring is deformed under force to generate elastic force. Through the elastic force of the second spring, the pressure plate is pushed to abut against the upper end of the reinforced layer with a greater force, ensuring the effect of preventing warping of the reinforced layer by the extrusion of the pressure plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] During the construction of the stable structure of the expansive soil subgrade of the present invention, first, the foundation is treated to ensure the stability of the foundation, then a water isolation layer is laid to prevent surface water from seeping into the subgrade during construction. Next, the construction of the improved soil layer is carried out. During the construction of the improved soil layer, the reinforced layer is laid in layers. Finally, the construction of the drainage system is carried out. The drainage facilities should be completed prior to the main subgrade project to timely drain the accumulated water during construction. And during the construction process, through the extrusion component and the pressure component, the warping of the reinforced layer during laying is avoided, ensuring the stable use of the stable structure of the expansive soil subgrade. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall external structure of the present invention;

[0030] Figure 2 is a schematic diagram of the structure of the positioning component of the present invention;

[0031] Figure 3 is a schematic diagram of the structure of the water isolation layer of the present invention;

[0032] Figure 4 Schematic diagram of the extrusion component and the telescopic component of the present invention;

[0033] Figure 5 Schematic diagram of the reinforcing layer structure of the present invention;

[0034] Figure 6 Schematic diagram of the pressure component, elastic component and sliding component of the present invention;

[0035] Figure 7 Schematic diagram of the transmission component and the connection component of the present invention;

[0036] Figure 8 Connection relationship diagram of the isolation layer and the mounting frame of the present invention;

[0037] Figure 9 is Figure 8 Partial enlarged view of part A in

[0038] In the figure: 101, water isolation layer; 102, reinforcing layer; 103, improved soil layer; 201, positioning groove; 202, positioning block; 301, installation groove; 302, extrusion plate; 303, inclined surface; 401, first sleeve; 402, first sliding rod; 403, first spring; 501, lifting plate; 502, pressure plate; 601, second sleeve; 602, second sliding rod; 603, second spring; 701, installation rod; 702, strip plate; 801, mounting frame; 802, rectangular plate; 803, transmission plate; 804, connecting petal; 805, connecting claw; 806, connecting hole; 807, outer expansion body; 808, connecting groove; 901, third sleeve; 902, third sliding rod; 903, third spring. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1

[0041] Please refer to Figures 1 - 7, A swelling soil subgrade stability structure in the figure includes a water isolation layer 101 laid on the foundation. Above the water isolation layer 101, a reinforced layer 102 is provided. Above the reinforced layer 102, a modified soil layer 103 is provided. The reinforced layer 102 is a geogrid. Between the water isolation layer 101 and the reinforced layer 102, a positioning component for assisting in the positioning during the laying process of the reinforced layer 102 and an extrusion component for anti-wrinkle extrusion of the reinforced layer 102 during the positioning process are provided. Above the reinforced layer 102, a pressure component for preventing the reinforced layer 102 from warping up after laying is provided;

[0042] It should be noted here that: during the construction of the swelling soil subgrade stability structure, first, the foundation is treated to ensure the stability of the foundation, and then the water isolation layer 101 is laid. The water isolation layer 101 is composed of an anti-seepage geotextile and a dense layer with a thickness of at least 5 cm (the hardness is slightly greater than that of the modified soil layer 103) from bottom to top. The positioning component is fixed on the anti-seepage geotextile and partially embedded in the dense layer to prevent surface water from seeping into the subgrade during construction. Then, the construction of the modified soil layer 103 is carried out. During the construction of the modified soil layer 103, the reinforced layer 102 is laid in layers. Finally, the construction of the drainage system is carried out. The drainage facilities should be completed prior to the main subgrade project to timely drain the accumulated water during construction. And during the construction process, through the extrusion component and the pressure component, the reinforced layer 102 is prevented from warping up during the laying process, ensuring the stable use of the swelling soil subgrade stability structure.

[0043] In the swelling soil subgrade stability structure, the positioning component includes positioning grooves 201 evenly distributed around the reinforced layer 102. A plurality of groups of positioning blocks 202 respectively inserted and positioned with the groups of positioning grooves 201 are fixed in the water isolation layer 101. The positioning blocks 202 are exposed above the water isolation layer 101, and the positioning blocks 202 and the positioning grooves 201 are mutually matched;

[0044] It should be noted here that: during the laying process of the reinforced layer 102 on the water isolation layer 101, the groups of positioning grooves 201 on the reinforced layer 102 are respectively abutted and aligned with the groups of positioning blocks 202 on the water isolation layer 101. Through the interaction between the groups of positioning grooves 201 and the positioning blocks 202, the laying of the reinforced layer 102 is positioned, facilitating the more accurate laying operation of the reinforced layer 102.

[0045] In the swelling soil subgrade stability structure, the extrusion component includes an installation groove 301 opened on the positioning block 202. A pressing plate 302 is slidably connected to the installation groove 301. An expansion and contraction component for telescopically connecting the pressing plate 302 is arranged inside the installation groove 301. On one side of the pressing plate 302, an inclined surface 303 for abutting and transmitting with the inner wall of the positioning groove 201 is opened;

[0046] It should be noted here that after the reinforcing layer 102 is positioned and laid, through the extrusion and pushing action of the first spring 403 on the extrusion plate 302, the extrusion plates 302 on each group of positioning blocks 202 are abutted against the inner wall of the positioning groove 201. Through the abutting and extrusion action, the periphery of the laid reinforcing layer 102 is extruded and pushed, and through the extrusion and pushing action, the corners of the reinforcing layer 102 are prevented from warping during the laying process.

[0047] In the expansive soil subgrade stability structure, the telescopic assembly includes multiple groups of first sleeves 401 fixed inside the installation groove 301. A first sliding rod 402 is slidably connected to each group of first sleeves 401. One end of the first sliding rod 402 is fixed to one side of the extrusion plate 302. A first spring 403 is sleeved outside the first sleeve 401. The two ends of the first spring 403 are respectively abutted against the inner wall of the installation groove 301 and the extrusion plate 302.

[0048] It should be noted here that through the first sleeve 401 and the first sliding rod 402, it is convenient for the telescopic connection of the extrusion plate 302, and through the first spring 403, it is convenient for pushing the retracted extrusion plate 302.

[0049] In the expansive soil subgrade stability structure, multiple groups of pressure components are provided, and each group of pressure components is evenly distributed around the upper part of the reinforcing layer 102. The pressure component includes a lifting plate 501 arranged above the reinforcing layer 102. A pressure plate 502 for extruding and pushing the reinforcing layer 102 is arranged between the lifting plate 501 and the reinforcing layer 102. An elastic component for elastically connecting the pressure plate 502 is arranged between the pressure plate 502 and the lifting plate 501. A sliding component for assisting the slidable connection of the lifting plate 501 is arranged on the reinforcing layer 102. A transmission component for transmitting the lifting plate 501 is arranged on the reinforcing layer 102.

[0050] It should be noted here that during the laying process of the improved soil layer 103 after the reinforcing layer 102 is laid, through the pressure action of the laid improved soil layer 103 on the rectangular plate 802 of the installation frame 801, the rectangular plate 802 is pushed to move towards the inside of the installation frame 801 under force. During the movement process, each group of lifting plates 501 is respectively pushed by each group of transmission plates 803 to move towards the reinforcing layer 102. During the process of the lifting plate 501 moving towards the reinforcing layer 102, through the connection action of the elastic component, the pressure plate 502 is driven to abut against the upper edge side of the reinforcing layer 102. Through the extrusion action on the reinforcing layer 102, the corners of the laid reinforcing layer 102 are prevented from warping, ensuring the flatness of the laid reinforcing layer 102, and further ensuring the stable use of the expansive soil subgrade stability structure.

[0051] In the swelling soil subgrade stabilizing structure, the elastic component includes multiple groups of second sleeves 601 fixed on the pressure plate 502. A second sliding rod 602 is slidably connected to the second sleeve 601. One end of the second sliding rod 602 is fixed to the lifting plate 501. A second spring 603 is sleeved outside the second sleeve 601. Two ends of the second spring 603 are respectively connected to the lifting plate 501 and the pressure plate 502.

[0052] It should be noted here that when the pressure plate 502 descends to abut against the upper end of the reinforcement layer 102, as the lifting plate 501 continues to descend, the lifting plate 501 contracts and moves towards the pressure plate 502 that is abutted and limited. During the movement, each group of second sliding rods 602 are respectively slid on each group of second sleeves 601 and the second spring 603 is deformed by force to generate elastic force. Through the elastic force of the second spring 603, the pressure plate 502 is pushed to abut against the upper end of the reinforcement layer 102 with a greater force, ensuring the effect of preventing the reinforcement layer 102 from tilting due to the extrusion of the pressure plate 502.

[0053] In the swelling soil subgrade stabilizing structure, the sliding component includes two groups of symmetrically arranged mounting rods 701 slidably connected to the lifting plate 501. One end of the mounting rod 701 is fixed to the upper end of the reinforcement layer 102. A strip plate 702 is fixed to the other end of the mounting rod 701.

[0054] It should be noted here that through the mounting rod 701 and the strip plate 702, it is convenient to assist the sliding connection of the lifting plate 501.

[0055] In the swelling soil subgrade stabilizing structure, the transmission component includes a mounting frame 801 centered on the upper end of the reinforcement layer 102. A rectangular plate 802 is connected to the mounting frame 801 through a connection component. A transmission plate 803 is fixedly connected between the rectangular plate 802 and the lifting plate 501.

[0056] As Figure 8 and Figure 9 shown, a connection structure with its top exposed is installed in the isolation layer 101. A plurality of circumferentially distributed connection petals 804 are installed on the top of the connection structure. Connection claws 805 are provided on the inner wall of the connection petals 804.

[0057] A connection hole 806 with a large top and a small bottom is provided at the bottom of the mounting frame 801. An expansion body 807 is installed in the connection hole 806. A connection groove 808 is installed on the outer wall of the expansion body 807. The connection groove 808 and the connection claws 805 are unidirectionally connected and hooked.

[0058] It should be noted here that after the reinforcement layer 102 is laid, the installation frame 801 is centered on the top of the reinforcement layer 102. By aligning the connecting flap 804 and the connecting hole 806, the installation frame 801 is vertically pressed down to hook and fit the connecting claw 805 and the connecting groove 808 to complete the installation of the installation frame 801. During the construction of the compacted layer of the isolation layer 101, the connecting structure and the positioning components need to be protected to ensure that the construction of the reinforcement layer 102 and the installation frame 801 will not be affected. Subsequently, during the laying process of the improved soil layer 103, due to the pressure of the laid improved soil layer 103 on the rectangular plate 802 on the installation frame 801, the rectangular plate 802 is pushed to move inward toward the interior of the installation frame 801. During the movement, each group of lifting plates 501 is respectively pushed by each group of transmission plates 803 to move toward the reinforcement layer 102. The installation frame 801 is pressed down through the connecting structure to ensure the stability of the reinforcement layer 102 and the high structural durability of the connecting structure and the installation frame 801.

[0059] In the expansive soil subgrade stability structure, the connecting component includes multiple groups of third sleeves 901 fixed inside the installation frame 801. A third sliding rod 902 is slidably connected to the third sleeve 901. One end of the third sliding rod 902 is fixed to the rectangular plate 802. A third spring 903 is sleeved outside the third sleeve 901. Two ends of the third spring 903 are respectively connected to the inner wall of the installation frame 801 and the rectangular plate 802.

[0060] It should be noted here that through the third sleeve 901 and the third sliding rod 902, it is convenient for the telescopic connection of the rectangular plate 802. Through the third spring 903, it is convenient for the reset of the rectangular plate 802 after the contraction movement.

[0061] A construction method for an expansive soil subgrade stability structure includes the following steps:

[0062] S1: During the construction of the expansive soil subgrade stability structure, first, the foundation is treated to ensure the stability of the foundation. Then, the water isolation layer 101 is laid to prevent surface water from seeping into the subgrade during construction. Next, the improved soil layer 103 is constructed. During the construction of the improved soil layer 103, the reinforcement layer 102 is laid in layers. Finally, the drainage system is constructed. The drainage facilities should be completed prior to the main subgrade project to facilitate the timely drainage of accumulated water during construction.

[0063] S2: During the laying process of the reinforcement layer 102 on the water isolation layer 101, each group of positioning grooves 201 on the reinforcement layer 102 are respectively abutted and aligned with each group of positioning blocks 202 on the water isolation layer 101. Through the interaction between each group of positioning grooves 201 and the positioning blocks 202, the laying of the reinforcement layer 102 is positioned, facilitating the more accurate laying operation of the reinforcement layer 102.

[0064] S3: And during the process of positioning the laying of the reinforcing layer 102 through the positioning groove 201 and the positioning block 202, as the positioning block 202 moves towards the inside of the positioning groove 201, the inclined surface 303 on the pressing plate 302 abuts against the inside of the positioning groove 201. During the abutting process, the pressing plate 302 is pushed to move towards the inside of the positioning groove 201 under force. During the movement of the pressing plate 302, each group of first sliding rods 402 are respectively pushed to slide on each group of first sleeves 401 and the first spring 403 is deformed under force to generate elastic force;

[0065] S4: After the positioning and laying of the reinforcing layer 102, through the extrusion and pushing action of the first spring 403 on the pressing plate 302, the pressing plates 302 on each group of positioning blocks 202 abut against the inner wall of the positioning groove 201. Through the abutting and extrusion action, the periphery of the laid reinforcing layer 102 is extruded and pushed. Through the extrusion and pushing action, the corners of the reinforcing layer 102 during the laying process are prevented from warping;

[0066] S5: And during the process of laying the improved soil layer 103 after the laying of the reinforcing layer 102, through the pressure action of the laid improved soil layer 103 on the rectangular plate 802 on the installation frame 801, the rectangular plate 802 is pushed to move towards the inside of the installation frame 801 under force. During the movement, each group of lifting plates 501 are respectively pushed by each group of transmission plates 803 to move towards the reinforcing layer 102;

[0067] S6: During the process of the lifting plate 501 moving towards the reinforcing layer 102, through the connection action of the elastic force assembly, the pressure plate 502 is driven to abut against the upper edge side of the reinforcing layer 102. Through the extrusion action on the reinforcing layer 102, the corners of the laid reinforcing layer 102 are prevented from warping, ensuring the flatness of the laid reinforcing layer 102, and further ensuring the stable use of the stable structure of the expansive soil subgrade;

[0068] S7: And when the pressure plate 502 abuts against the upper end of the reinforcing layer 102 due to the descent of the pressure plate 502, as the lifting plate 501 continues to descend, the lifting plate 501 moves towards the pressure plate 502 which is abutted and limited and contracts. During the movement, each group of second sliding rods 602 are respectively pushed to slide on each group of second sleeves 601 and the second spring 603 is deformed under force to generate elastic force. Through the elastic force of the second spring 603, the pressure plate 502 is pushed to abut against the upper end of the reinforcing layer 102 with a greater force, ensuring the effect of preventing warping by the extrusion of the pressure plate 502 on the reinforcing layer 102.

[0069] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0070] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stable structure for an expansive soil subgrade, characterized in that, It includes a waterproof layer (101) laid on the foundation; A reinforcement layer (102) is arranged above the waterproof layer (101), an improved soil layer (103) is arranged above the reinforcement layer (102), the reinforcement layer (102) is a civil grid, a positioning component for assisting the positioning of the reinforcement layer (102) during the laying process and an extrusion component for anti-wrinkling extrusion of the reinforcement layer (102) during the positioning process are arranged between the waterproof layer (101) and the reinforcement layer (102), and a pressure component for preventing the reinforcement layer (102) from warping after laying is arranged above the reinforcement layer (102).

2. The stable structure of an expansive soil subgrade according to claim 1, wherein: The positioning assembly comprises positioning grooves (201) uniformly distributed around the reinforcement layer (102); a plurality of groups of positioning blocks (202) respectively inserted and positioned in the respective groups of positioning grooves (201) are fixed in the waterproof layer (101); the positioning blocks (202) are exposed above the waterproof layer (101); and the positioning blocks (202) and the positioning grooves (201) are matched with each other.

3. The stable structure of an expansive soil subgrade according to claim 2, wherein: The extrusion assembly comprises a mounting groove (301) provided on the positioning block (202), a pressing plate (302) being slidably connected to the mounting groove (301), a telescopic assembly for telescopically connecting the pressing plate (302) being provided inside the mounting groove (301), and an inclined surface (303) for abutting against the inner wall of the positioning groove (201) for transmission is provided on one side of the pressing plate (302).

4. The stable structure of an expansive soil subgrade according to claim 3, characterized in that: The telescopic assembly comprises a plurality of groups of first sleeves (401) fixed inside the mounting groove (301), each group of the first sleeves (401) being slidably connected with a first slide bar (402), one end of the first slide bar (402) being fixed to one side of the extrusion plate (302), a first spring (403) being sleeved on the outer side of the first sleeve (401), and two ends of the first spring (403) being respectively disposed against the inner wall of the mounting groove (301) and the extrusion plate (302).

5. The stable structure of an expansive soil subgrade according to claim 1, wherein: The pressure components are provided in multiple groups, and each group of pressure components is evenly distributed around the reinforcing layer (102). The pressure components include a lifting plate (501) provided above the reinforcing layer (102), a pressure plate (502) for squeezing and pushing the reinforcing layer (102) is provided between the lifting plate (501) and the reinforcing layer (102), an elastic component for elastically connecting the pressure plate (502) is provided between the pressure plate (502) and the lifting plate (501), a sliding component for assisting the slidable connection of the lifting plate (501) is provided on the reinforcing layer (102), and a transmission component for transmitting the lifting plate (501) is provided on the reinforcing layer (102).

6. A swelling soil subgrade stability structure according to claim 5, characterized in that: The elastic component includes multiple groups of second sleeves (601) fixed to the pressure plate (502). A second sliding rod (602) is slidably connected to the second sleeve (601). One end of the second sliding rod (602) is fixed to the lifting plate (501). A second spring (603) is sleeved outside the second sleeve (601). The two ends of the second spring (603) are respectively connected to the lifting plate (501) and the pressure plate (502).

7. The stable structure of an expansive soil subgrade according to claim 6, characterized in that: The sliding component includes two groups of symmetrically arranged mounting rods (701) slidably connected to the lifting plate (501). One end of the mounting rod (701) is fixed to the upper end of the reinforcing layer (102). A strip plate (702) is fixed to the other end of the mounting rod (701).

8. A swelling soil subgrade stability structure according to claim 5, characterized in that: The transmission assembly includes an installation frame (801) centered at Reinforcing layer (102) the upper end. A rectangular plate (802) is connected to the installation frame (801) through a connection assembly, and a transmission plate (803) is fixedly connected between the rectangular plate (802) and the lifting plate (501); A connecting structure with its top exposed is installed in the isolation layer (101). A plurality of circumferentially distributed connecting flaps (804) are installed at the top of the connecting structure. Connecting claws (805) are provided on the inner wall of the connecting flap (804). The bottom of the installation frame (801) is provided with a connecting hole (806) that is large at the top and small at the bottom. An expansion body (807) is installed in the connecting hole (806). A connecting groove (808) is installed on the outer wall of the expansion body (807). The connecting groove (808) and the connecting claw (805) are unidirectionally connected and hooked.

9. A swelling soil subgrade stability structure according to claim 8, characterized in that: The connecting component includes multiple groups of third sleeves (901) fixed inside the installation frame (801). A third sliding rod (902) is slidably connected to the third sleeve (901). One end of the third sliding rod (902) is fixed to the rectangular plate (802). A third spring (903) is sleeved outside the third sleeve (901). The two ends of the third spring (903) are respectively connected to the inner wall of the installation frame (801) and the rectangular plate (802).

10. A construction method for a stable structure of an expansive soil subgrade, which refers to a stable structure of an expansive soil subgrade described in any one of claims 1-9, characterized in that, Comprising the following steps: S1: During the construction of the expansive soil subgrade stability structure, first conduct foundation treatment to ensure the stability of the foundation, then lay the waterproof layer (101) to prevent surface water from seeping into the subgrade during construction. Next, carry out the construction of the improved soil layer (103). During the construction of the improved soil layer (103), lay the reinforcing layer (102) in layers. Finally, carry out the construction of the drainage system. The drainage facilities should be completed prior to the main subgrade project to drain the accumulated water in a timely manner during construction; S2: During the laying process of the reinforcing layer (102) on the waterproof layer (101), align each group of positioning grooves (201) on the reinforcing layer (102) with each group of positioning blocks (202) on the waterproof layer (101). Through the interaction between the positioning grooves (201) and the positioning blocks (202), position the laying of the reinforcing layer (102) to facilitate more accurate laying operation of the reinforcing layer (102). S3: And during the process of positioning the laying of the reinforcing layer (102) through the positioning groove (201) and the positioning block (202), as the positioning block (202) moves towards the inside of the positioning groove (201), the inclined surface (303) on the pressing plate (302) abuts against the inside of the positioning groove (201). During the abutting process, the pressing plate (302) is pushed to move towards the inside of the positioning groove (201) under force. During the movement of the pressing plate (302), each group of first sliding rods (402) are respectively pushed to slide on each group of first sleeves (401) and the first spring (403) is deformed under force to generate elastic force; S4: After the positioning and laying of the reinforcing layer (102), through the squeezing and pushing action of the first spring (403) on the pressing plate (302), the pressing plates (302) on each group of positioning blocks (202) abut against the inner wall of the positioning groove (201). Through the abutting and squeezing action, the four sides of the laid reinforcing layer (102) are squeezed and pushed. Through the squeezing and pushing action, the corners of the reinforcing layer (102) during the laying process are prevented from warping; S5: During the laying process of the improved soil layer (103) after the laying of the reinforcing layer (102), through the pressure action of the laid improved soil layer (103) on the rectangular plate (802) on the installation frame (801), the rectangular plate (802) is pushed to move towards the inside of the installation frame (801) under force. During the movement, each group of lifting plates (501) are respectively pushed by each group of transmission plates (803) to move towards the reinforcing layer (102); S6: During the process of the lifting plate (501) moving towards the reinforcing layer (102), through the connection action of the elastic force assembly, the pressure plate (502) is driven to abut against the upper edge side of the reinforcing layer (102). Through the squeezing action on the reinforcing layer (102), the corners of the laid reinforcing layer (102) are prevented from warping, ensuring the flatness of the laid reinforcing layer (102), and further ensuring the stable use of the stable structure of the expansive soil subgrade; S7: When the pressure plate (502) abuts against the upper end of the reinforcing layer (102) due to the descent of the pressure plate (502), as the lifting plate (501) continues to descend, the lifting plate (501) moves towards the pressure plate (502) which is abutted and limited and contracts. During the movement, each group of second sliding rods (602) are respectively pushed to slide on each group of second sleeves (601) and the second spring (603) is deformed under force to generate elastic force. Through the elastic force of the second spring (603), the pressure plate (502) is pushed to abut against the upper end of the reinforcing layer (102) with a greater force, ensuring the effect of preventing warping by the pressure plate (502) squeezing the reinforcing layer (102).

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