Fine sand foundation reinforcing structure for laying municipal pipelines and construction method of fine sand foundation reinforcing structure

Abstract

The invention relates to the technical field of municipal pipeline foundation treatment, and discloses a fine sand foundation reinforcing structure for laying municipal pipelines and a construction method thereof.The fine sand foundation reinforcing structure comprises a fine sand base layer body and a soil base layer arranged at the bottom of the fine sand base layer body; two civil grids are laid at the top end of the fine sand base layer body, a pressing strip is installed between the two civil grids, and a supporting piece is installed on the pressing strip and used for supporting a pipeline. Two fasteners which are in threaded connection are symmetrically arranged on the pressing strip; by arranging the civil grids and the pressing strips, the civil grids and the pressing strips are matched with the fasteners and the movable parts for use, the first spiral blades and the second spiral blades penetrate into the soil base layer, the stability of the foundation can be further improved, the reinforcing effect is achieved, the foundation collapse is prevented, the first spiral blades and the second spiral blades can be achieved through rotation, complex excavation and filling work is not needed, and the construction efficiency is improved. The construction time is saved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of municipal pipeline foundation treatment, and in particular to a fine sand foundation reinforcement structure for laying municipal pipelines and a construction method thereof. Background Art

[0002] At present, in municipal engineering construction, especially when laying underground pipelines under soft soil conditions, the problem of insufficient foundation bearing capacity is often encountered. Traditional foundation treatment methods, such as compaction method, can improve the bearing capacity of the foundation to a certain extent, but there are still many limitations in practical applications.

[0003] The compaction method is to use heavy rollers or other compaction equipment to roll the foundation soil multiple times to increase its density, thereby improving the bearing capacity of the foundation. However, for fine sand foundations, due to the small friction between particles, the compaction effect is not ideal and it is easy to cause foundation settlement.

[0004] To this end, the present invention provides a fine sand foundation reinforcement structure for laying municipal pipelines and a construction method thereof. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The present invention provides a fine sand foundation reinforcement structure for laying municipal pipelines and a construction method thereof, comprising a fine sand base body and a soil base arranged at the bottom of the fine sand base body; Two civil grids are laid on the top of the fine sand base body, a compression strip is installed between the two civil grids, and a support is installed on the compression strip to support the pipeline; The compression strip is symmetrically provided with two fasteners connected by threads, and the lower end of each fastener passes through the interior of the fine sand base body and extends into the soil base, so as to fix the compression strip; The bottom end of each civil engineering grid is equidistantly connected with a sleeve, each sleeve is provided with an annular sand falling groove, and each sleeve is symmetrically provided with two groups of inclined grooves for introducing fine sand into the sleeve.

[0007] Preferably, the support member comprises a pipe support and an arc-shaped friction strip; A pipe support is installed at the top end of the compression strip, and a plurality of arc-shaped friction strips are equidistantly connected to the inner wall of the pipe support.

[0008] Preferably, the fastener comprises an externally threaded sleeve, a first tapered block, a first spiral blade and an expansion member; The compression strip is connected to two externally threaded sleeve rods via threads, the bottom end of each of the externally threaded sleeve rods is connected to a first conical block, and the outer wall of each of the first conical blocks is connected to a first spiral blade.

[0009] Preferably, the expansion member comprises a movable chamber, a limiting groove, a tapered rod, a connecting plate and a first screw rod; Each of the externally threaded sleeves is provided with an active chamber, and each of the externally threaded sleeves is provided with four limiting grooves equidistantly circumferentially, and each of the limiting grooves is communicated with the active chamber, and a conical rod is fitted inside each of the limiting grooves, and a connecting plate is slidably connected to the inner wall of the active chamber, and the top end of each conical rod is rotatably connected to the inside of the connecting plate, and a first screw is rotatably connected to the top end of the connecting plate, and the outer wall of the first screw is connected to the inside of the externally threaded sleeve through a thread.

[0010] Preferably, each sleeve is internally connected with a movable part via a thread, and the lower end of each movable part passes through the interior of the fine sand base body and extends into the soil base for fixing the civil grid.

[0011] Preferably, the movable part includes a second screw, a second conical block and a second spiral blade; The interior of each sleeve is connected to a second screw rod via a thread, the bottom end of each second screw rod is connected to a second conical block, and the outer wall of each second conical block is connected to a second spiral blade.

[0012] Preferably, an arc-shaped groove is provided inside the pipe support.

[0013] Preferably, four annular sand collecting discs with grooves are arranged inside the sleeve from top to bottom, multiple connecting rods are connected between each of the annular sand collecting discs, and the multiple connecting rods are circumferentially equidistantly arranged, and each annular sand collecting disc at the upper part of each sleeve and the top end of the first screw are connected to two ropes, and each rope is connected to the rope at the nearest adjacent annular sand collecting disc or the top end of the first screw.

[0014] A construction method for a fine sand foundation reinforcement structure for laying municipal pipelines according to the above-mentioned method comprises the following steps: S1. Pre-treat the surface of the main body of the fine sand base, including cleaning the surface debris, leveling the ground of the main body of the fine sand base, and marking the area for subsequent paving of civil engineering grids; S2, then insert the sleeve into the fine sand base body, adjust the position of the civil engineering grid, so that the civil engineering grid is in a flat state on the surface of the fine sand base body, and then rotate the movable part so that the lower end of the movable part enters the soil base to fix the civil engineering grid. The civil engineering grid in this step can be laid in one or more layers to enhance the integrity and stability of the fine sand base body. The transverse installations between the civil engineering grids are connected by compression strips; S3, rotating the fastener on the compression strip into the main body of the fine sand base until the lower end of the fastener enters the soil base to fix the compression strip, and then driving the expansion piece inside the fastener to move downward, so that the parts inside the expansion piece extend from the fastener and are inserted into the soil base; S4. When the first screw is rotated to move downward inside the fastener, the rope will be driven to move downward synchronously, causing the other end of the rope to drive another rope to move upward, and then the multiple annular sand collecting discs inside the sleeve drive the sand to move upward, thereby increasing the density of the sand inside the sleeve. At this time, there will be extra space inside the sleeve, and the sand outside the sleeve will continue to enter the interior through the inclined groove, thereby increasing the weight of the sleeve; S5. Finally, place the municipal pipeline to be laid inside the support, and then fix the pipeline with components such as bolts or clamps; completed.

[0015] The beneficial effects of the present invention are as follows: the fine sand foundation reinforcement structure for laying municipal pipelines and the construction method thereof described in the present invention, by providing a civil grid, can form an integral reinforcement system through its criss-crossing grid structure, and tightly connect the fine sand particles of the foundation, thereby improving the shear strength and bearing capacity of the foundation. During the pipeline laying process, the weight of the pipeline and the possible dynamic load will exert a greater pressure on the foundation. The civil grid can effectively disperse these loads and transfer them more evenly to the foundation soil, which helps to reduce the local compression of the foundation and reduce the risk of foundation damage. When used in conjunction with fasteners and movable parts, the first spiral blade and the second spiral blade are both deeply embedded in the soil base, which can further improve the stability of the foundation, play a reinforcing role, and prevent the foundation from collapsing. Both can be achieved by rotation, without the need for complicated excavation and filling work, saving construction time and improving construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a stereogram of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structural cross-section of the fine sand base body, soil base, civil engineering grid and supporting members in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the fastener in the present invention; Figure 4It is a partial schematic cross-sectional view of the three-dimensional structure of the fastener in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the tapered rod in the present invention in an unfolded state; Figure 6 It is a partial schematic diagram of the three-dimensional structural section of the sleeve and the inclined groove in the present invention.

[0017] Description of reference numerals: 1. Fine sand base body; 2. Soil base; 3. Civil grid; 4. Compression strip; 5. Support; 51. Pipe support; 52. Arc friction strip; 6. Fastener; 61. External threaded sleeve; 62. First conical block; 63. First spiral blade; 64. Expansion piece; 641. Movable chamber; 642. Limiting groove; 643. Conical rod; 644. Connecting plate; 645. First screw; 7. Sleeve; 71. Annular sand falling groove; 72. Inclined groove; 8. Annular sand collecting plate; 81. Connecting rod; 82. Rope; 9. Movable part; 91. Second screw; 92. Second conical block; 93. Second spiral blade. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0019] Embodiment 1 like Figures 1 to 6 As shown, a fine sand foundation reinforcement structure for laying municipal pipelines according to an embodiment of the present invention comprises a fine sand base body 1 and a soil base 2 arranged at the bottom of the fine sand base body 1; Two earth grids 3 are laid on the top of the fine sand base body 1, a compression strip 4 is installed between the two earth grids 3, and a support 5 is installed on the compression strip 4 to support the pipeline; Two fasteners 6 connected by threads are symmetrically arranged on the compression strip 4, and the lower end of each fastener 6 passes through the interior of the fine sand base body 1 and extends into the soil base 2, so as to fix the compression strip 4; The bottom end of each of the civil engineering grids 3 is equidistantly connected to a sleeve 7, each sleeve 7 is provided with an annular sand dropping groove 71, and each sleeve 7 is symmetrically provided with two sets of inclined grooves 72 for introducing fine sand into the sleeve 7; through the cooperation between the annular sand dropping groove 71 and the inclined groove 72, after the sleeve 7 enters the fine sand base body 1, the fine sand will enter the sleeve through the inclined groove 72, thereby increasing the weight of the sleeve.

[0020] Please refer to Figure 1 , the support member 5 includes a pipe support 51 and an arc-shaped friction strip 52; A pipe support 51 is installed at the top end of the compression strip 4 , and a plurality of arc-shaped friction strips 52 are equidistantly connected to the inner wall of the pipe support 51 .

[0021] Please refer to Figure 1 An arc groove is provided inside the pipe support 51 .

[0022] Specifically, by providing a pipe support 51, it can play a role in preliminary positioning of the subsequently laid municipal pipeline. By cooperating with the design of the arc groove, the pipe support 51 can be more adapted to the outer wall of the municipal pipeline. By designing the arc friction strip 52, the friction between the pipe support 51 and the outer wall of the municipal pipeline can be increased, thereby improving the stability of the municipal pipeline during installation and subsequent use.

[0023] Please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 The fastener 6 includes an external threaded sleeve 61, a first tapered block 62, a first spiral blade 63 and an expansion member 64; Two external threaded sleeves 61 are connected to the compression strip 4 by threads, the bottom end of each external threaded sleeve 61 is connected to a first conical block 62 , and the outer wall of each first conical block 62 is connected to a first spiral blade 63 .

[0024] Specifically, by driving the externally threaded sleeve 61 to rotate on the compression strip 4, the first conical block 62 and the first spiral blade 63 enter the soil base layer 2 along the fine sand base body 1. The rotation of the externally threaded sleeve 61 and its penetration into the soil layer can increase the connection strength between the civil engineering grille 3 and the foundation, thereby enhancing the overall stability of the foundation. The first spiral blade 63 can stir the soil during rotation, so that a closer contact is formed between the soil and the externally threaded sleeve 61 and the first conical block 62, further improving the stability of the foundation. The externally threaded sleeve 61 and the first spiral blade 63 penetrate into the soil base layer 2 to play a reinforcing role and prevent the foundation from collapsing. By driving the externally threaded sleeve 61 to rotate, the civil engineering grille 3 can be easily fixed on the surface of the fine sand base body 1 without complicated excavation and filling work, saving construction time and improving construction efficiency and quality.

[0025] Please refer to Figure 4 , Figure 5 , the expansion member 64 includes a movable chamber 641, a limiting groove 642, a tapered rod 643, a connecting plate 644 and a first screw 645; Each externally threaded sleeve 61 is provided with an active chamber 641, and each externally threaded sleeve 61 is provided with four limiting grooves 642 equidistantly around the circumference, and each limiting groove 642 is communicated with the active chamber 641, and each limiting groove 642 is fitted with a conical rod 643, and the inner wall of the active chamber 641 is slidably connected to a connecting plate 644, and the top end of each conical rod 643 is rotatably connected to the inside of the connecting plate 644, and the top end of the connecting plate 644 is rotatably connected to a first screw 645, and the outer wall of the first screw 645 is connected to the inside of the externally threaded sleeve 61 through a thread.

[0026] Specifically, by driving the first screw 645 to rotate inside the external threaded sleeve 61, the first screw 645 drives the connecting plate 644 to move downward inside the active chamber 641, thereby driving the four tapered rods 643 on the connecting plate 644 to slide inside the limiting groove 642 until the first screw 645 is driven to Figure 4 After it is in position, it stops rotating. At this time, the tapered rod 643 is completely inserted into the soil base layer 2 and further penetrates into the soil, thereby increasing the friction between the external threaded sleeve 61 and the soil, improving the grip, and improving the overall stability of the foundation. The distribution of the tapered rod 643 and the way it penetrates into the soil help to distribute the load on the foundation more evenly to the soil, reducing the settlement and deformation of the foundation. This design makes the construction process more convenient and efficient, and no additional excavation or filling work is required. A firm connection between the external threaded sleeve 61 and the soil can be achieved by rotating the first screw 645.

[0027] Please refer to Figure 1 , Figure 6 Each sleeve 7 is threadedly connected with a movable part 9 , and the lower end of each movable part 9 passes through the fine sand base body 1 and extends into the soil base 2 for fixing the civil grid 3 .

[0028] Please refer to Figure 1 , Figure 6 , the movable member 9 includes a second screw 91, a second conical block 92 and a second spiral blade 93; The interior of each sleeve 7 is connected to a second screw rod 91 through a thread, the bottom end of each second screw rod 91 is connected to a second conical block 92, and the outer wall of each second conical block 92 is connected to a second spiral blade 93.

[0029] Specifically, by rotating the second screw 91 inside the sleeve 7, the second conical block 92 drives the second spiral blade 93 along the fine sand base body 1 into the soil base 2. At the same time, the second spiral blade 93 can stir the soil during the rotation process, so that a larger contact area is formed between the soil and the second screw 91. The expansion of the contact area helps to increase the bearing capacity of the foundation, enabling it to withstand a larger load, thereby quickly fixing the civil grid 3.

[0030] Please refer to Figure 1 , Figure 6 Four annular sand collecting discs 8 with grooves are arranged from top to bottom inside the sleeve 7, and multiple connecting rods 81 are connected between each annular sand collecting disc 8, and the multiple connecting rods 81 are arranged equidistantly in the circumferential direction. Two ropes 82 are connected to the top of the annular sand collecting disc 8 at the upper part of each sleeve 7 and the first screw 645, and each rope 82 is connected to the rope 82 at the top of the nearest adjacent annular sand collecting disc 8 or the first screw 645.

[0031] Specifically, when the first screw 645 is rotated to move downward inside the fastener 6, the rope 82 will be driven to move downward synchronously, causing the other end of the rope 82 to drive another rope 82 to move upward, and then the multiple annular sand collecting plates 8 inside the sleeve 7 drive the sand to move upward, thereby increasing the density of the sand inside the sleeve 7. At this time, there will be extra space inside the sleeve 7, and the sand outside the sleeve 7 will continue to enter the annular sand dropping groove 71 through the inclined groove 72, thereby increasing the weight of the sleeve 7.

[0032] A construction method for a fine sand foundation reinforcement structure for laying municipal pipelines according to the above method comprises the following steps: S1, pre-treat the surface of the fine sand base body 1, including cleaning the surface debris, leveling the ground of the fine sand base body 1, and marking the area for subsequent paving of the civil engineering grid 3; S2, then insert the sleeve 7 into the fine sand base body 1, adjust the position of the civil engineering grid 3, so that the civil engineering grid 3 is in a flat state on the surface of the fine sand base body 1, and then rotate the movable part 9 so that the lower end of the movable part 9 enters the soil base 2 to fix the civil engineering grid 3. In this step, the civil engineering grid 3 can be laid in one or more layers to enhance the integrity and stability of the fine sand base body 1. The transverse installation between the civil engineering grids 3 is connected by the compression strip 4; S3, the fastener 6 on the compression strip 4 is rotated to enter the fine sand base body 1 until the lower end of the fastener 6 enters the soil base 2 to fix the compression strip 4, and then the expansion piece 64 inside the fastener 6 is driven to move downward, so that the parts inside the expansion piece 64 extend from the fastener 6 and are inserted into the soil base 2; S4. When the first screw 645 is rotated to move downward inside the fastener 6, the rope 82 will be driven to move downward synchronously, causing the other end of the rope 82 to drive another rope 82 to move upward, thereby causing the multiple annular sand collecting plates 8 inside the sleeve 7 to drive the sand to move upward, thereby increasing the density of the sand inside the sleeve 7. At this time, there will be extra space inside the sleeve 7, and the sand outside the sleeve 7 will continue to enter the annular sand falling groove 71 through the inclined groove 72, thereby increasing the weight of the sleeve 7; S5. Finally, place the municipal pipeline to be laid inside the support 5, and then fix the pipeline with components such as bolts or clamps; finished.

[0033] Working principle: First, pre-treat the surface of the fine sand base body 1, including cleaning the surface debris, leveling the ground of the fine sand base body 1, and marking the area for subsequent paving of the civil engineering grid 3; Then, insert the sleeve 7 into the fine sand base body 1, adjust the position of the civil engineering grid 3, make the civil engineering grid 3 be in a flat state on the surface of the fine sand base body 1, rotate the second screw 91, make the second conical block 92 drive the second spiral blade 93 along the fine sand base body 1 into the soil base 2, and at the same time, the second spiral blade 93 can stir the soil during the rotation process, so that a larger contact area is formed between the soil and the second screw 91, and the expansion of this contact area helps to increase the bearing capacity of the foundation, so that it can withstand a larger load, so that the civil engineering grid 3 can be quickly fixed, which is used to fix the civil engineering grid 3, wherein the civil engineering grid 3 in this step can be laid in one or more layers to enhance the integrity and stability of the fine sand base body 1, and the lateral installation between the civil engineering grids 3 is connected by the compression strip 4; The external threaded sleeve 61 is driven to rotate on the compression strip 4, so that the first conical block 62 and the first spiral blade 63 enter the soil base layer 2 along the fine sand base body 1. The rotation of the external threaded sleeve 61 and the penetration into the soil layer can increase the connection strength between the civil engineering grille and the foundation, thereby enhancing the overall stability of the foundation. The first spiral blade 63 can stir the soil during the rotation process, so that the soil, the external threaded sleeve 61 and the first conical block 62 form a closer contact, further improving the stability of the foundation. The external threaded sleeve 61 and the first spiral blade 63 penetrate into the soil base 2 to play a reinforcing role and prevent the foundation from collapsing. By driving the external threaded sleeve 61 to rotate, the civil engineering grille 3 can be easily fixed on the surface of the fine sand base body 1, without the need for complicated excavation and filling work, saving construction time and improving construction efficiency and quality. The first screw 645 is driven to rotate inside the external threaded sleeve 61, and then the first screw 645 drives the connecting plate 644 to move downward inside the movable chamber 641, thereby driving the four tapered rods 643 on the connecting plate 644 to slide inside the limiting groove 642 until the first screw 645 is driven to Figure 4After the first screw 645 is in the right position, the rotation stops. At this time, the tapered rod 643 is completely inserted into the soil base 2 and further penetrates into the soil, thereby increasing the friction between the external threaded sleeve 61 and the soil, improving the grip, and improving the overall stability of the foundation. The distribution of the tapered rod 643 and the way it penetrates into the soil help to distribute the load on the foundation more evenly to the soil, reducing the settlement and deformation of the foundation. This design makes the construction process more convenient and efficient, and does not require additional excavation or filling work. The external threaded sleeve 61 can be firmly connected to the soil by rotating the first screw 645. When the first screw 645 is rotated to move downward inside the fastener 6, the rope 82 will be driven to move downward synchronously, causing the other end of the rope 82 to drive another rope 82 to move upward, thereby causing the multiple annular sand collecting plates 8 inside the sleeve 7 to drive the sand to move upward, thereby increasing the density of the sand inside the sleeve 7. At this time, there will be extra space inside the sleeve 7, and the sand outside the sleeve 7 will continue to enter the annular sand falling groove 71 through the inclined groove 72, thereby increasing the weight of the sleeve 7; Finally, the municipal pipeline to be laid is placed inside the pipeline support 51. The pipeline support 51 can play a role in preliminary positioning of the subsequently laid municipal pipeline. With the design of the arc groove, the pipeline support 51 can be more adapted to the outer wall of the municipal pipeline. The design of the arc friction strip 52 can increase the friction between the pipeline support 51 and the outer wall of the municipal pipeline, thereby improving the stability of the municipal pipeline during installation and subsequent use. Then the pipeline can be fixed by components such as bolts or clamps.

[0034] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A fine sand foundation reinforcement structure for laying municipal pipelines, comprising a fine sand base body (1) and a soil base body (2) arranged at the bottom of the fine sand base body (1); characterized in that: Two earth grids (3) are laid on the top of the fine sand base body (1), a compression strip (4) is installed between the two earth grids (3), and a support member (5) is installed on the compression strip (4) for supporting the pipeline; The compression strip (4) is symmetrically provided with two fasteners (6) connected by threads, and the lower end of each fastener (6) passes through the interior of the fine sand base body (1) and extends into the soil base (2) for fixing the compression strip (4); The bottom end of each of the civil engineering grids (3) is equidistantly connected to a sleeve (7), each of the sleeves (7) is provided with an annular sand falling groove (71) inside, and each of the sleeves (7) is symmetrically provided with two groups of inclined grooves (72) for introducing fine sand into the sleeve (7).

2. A fine sand foundation reinforcement structure for laying municipal pipelines according to claim 1, characterized in that: The support member (5) comprises a pipe support (51) and an arc-shaped friction strip (52); A pipe support (51) is installed at the top end of the compression strip (4), and a plurality of arc-shaped friction strips (52) are equidistantly connected to the inner wall of the pipe support (51).

3. The fine sand foundation reinforcement structure for laying municipal pipelines according to claim 1, characterized in that: The fastener (6) comprises an externally threaded sleeve (61), a first tapered block (62), a first spiral blade (63) and an expansion piece (64); The compression strip (4) is threadedly connected to two externally threaded sleeve rods (61), the bottom end of each of the externally threaded sleeve rods (61) is connected to a first conical block (62), and the outer wall of each of the first conical blocks (62) is connected to a first spiral blade (63).

4. The fine sand foundation reinforcement structure for laying municipal pipelines according to claim 3, characterized in that: The expansion member (64) comprises an active chamber (641), a limiting groove (642), a tapered rod (643), a connecting plate (644) and a first screw rod (645); Each of the externally threaded sleeve rods (61) is provided with an active chamber (641) therein; each of the externally threaded sleeve rods (61) is provided with four limiting grooves (642) equidistantly arranged in the circumferential direction; each of the limiting grooves (642) is communicated with the active chamber (641); each of the limiting grooves (642) is fitted with a conical rod (643); the inner wall of the active chamber (641) is slidably connected to a connecting plate (644); the top end of each of the conical rods (643) is rotatably connected to the inside of the connecting plate (644); the top end of the connecting plate (644) is rotatably connected to a first screw rod (645); the outer wall of the first screw rod (645) is connected to the inside of the externally threaded sleeve rod (61) via a thread.

5. The fine sand foundation reinforcement structure for laying municipal pipelines according to claim 1, characterized in that: Each sleeve (7) is internally connected to a movable part (9) via a thread, and the lower end of each movable part (9) passes through the interior of the fine sand base body (1) and extends into the soil base (2) for fixing the civil engineering grid (3).

6. A fine sand foundation reinforcement structure for laying municipal pipelines according to claim 5, characterized in that: The movable member (9) comprises a second screw rod (91), a second conical block (92) and a second spiral blade (93); The interior of each sleeve (7) is connected to a second screw rod (91) via a thread, the bottom end of each second screw rod (91) is connected to a second conical block (92), and the outer wall of each second conical block (92) is connected to a second spiral blade (93).

7. The fine sand foundation reinforcement structure for laying municipal pipelines according to claim 2, characterized in that: An arc-shaped groove is provided inside the pipe support (51).

8. The fine sand foundation reinforcement structure for laying municipal pipelines according to claim 1, characterized in that: Four annular sand collecting discs (8) with grooves are arranged from top to bottom inside the sleeve (7), and a plurality of connecting rods (81) are connected between each of the annular sand collecting discs (8), and the plurality of connecting rods (81) are arranged equidistantly in the circumferential direction. Two ropes (82) are connected to the top of each annular sand collecting disc (8) and the first screw (645) at the top of each sleeve (7), and each rope (82) is connected to the rope (82) at the top of the nearest adjacent annular sand collecting disc (8) or the first screw (645).

9. A construction method for a fine sand foundation reinforcement structure for laying municipal pipelines according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, pre-treating the surface of the fine sand base body (1), including cleaning the surface debris, leveling the ground of the fine sand base body (1), and marking the area for subsequent paving of the civil engineering grid (3); S2, then insert the sleeve (7) into the fine sand base body (1), adjust the position of the civil engineering grid (3), so that the civil engineering grid (3) is in a flat state on the surface of the fine sand base body (1), and then rotate the movable member (9) so that the lower end of the movable member (9) enters the soil base (2) to fix the civil engineering grid (3), wherein the civil engineering grid (3) in this step can be laid in one or more layers to enhance the integrity and stability of the fine sand base body (1), and the transverse installations between the civil engineering grids (3) are connected by compression strips (4); S3, rotating the fastener (6) on the compression strip (4) into the fine sand base body (1) until the lower end of the fastener (6) enters the soil base (2) to fix the compression strip (4), and then driving the expansion piece (64) inside the fastener (6) to move downward, so that the parts inside the expansion piece (64) extend out of the fastener (6) and are inserted into the soil base (2); S4. When the first screw rod (645) is rotated to move downward inside the fastener (6), the rope (82) is driven to move downward synchronously, causing the other end of the rope (82) to drive another rope (82) to move upward, thereby causing the plurality of annular sand collecting plates (8) inside the sleeve (7) to drive the sand upward, thereby increasing the density of the sand inside the sleeve (7). At this time, there will be extra space inside the sleeve (7), and the sand outside the sleeve (7) will continue to enter the annular sand falling groove (71) through the inclined groove (72), thereby increasing the weight of the sleeve (7); S5. Finally, place the municipal pipeline to be laid inside the support (5), and then fix the pipeline with components such as bolts or clamps; complete.

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