A foundation pit retaining structure for soft soil foundation and a construction method thereof

Abstract

The application relates to the technical field of foundation pit support technology, and particularly discloses a foundation pit support structure of a soft soil foundation and a construction method thereof. The foundation pit support structure of the soft soil foundation comprises a soft soil layer and a cinder layer, a groove is arranged above the cinder layer, a clay layer is filled in the groove, and a foundation pit retaining wall is built in the clay layer. A horizontal mounting bracket is mounted on the upper side of the soft soil layer, an intercepting frame is welded on the upper side of the side of the mounting bracket close to the clay layer, the clay layer and the cinder layer are located on the opposite sides of the intercepting frame, and an intercepting net is welded on the side of the intercepting frame close to the cinder layer. A reinforcing assembly is arranged on the upper side of the mounting bracket, the reinforcing assembly applies a pulling force away from the clay layer to the intercepting frame, the intercepting net and the intercepting frame cooperate to reduce the movement of cinder particles to the clay layer, thereby reducing the cinder particles entering the clay layer, and the application improves the problem that the cinder particles are prone to damaging the water stop curtain as a whole.

Description

Technical Field

[0001] This application relates to the field of foundation pit support technology, and in particular to a foundation pit support structure for soft soil foundations and its construction method. Background Technology

[0002] Soft soil foundation refers to a weak soil layer with low strength and high compressibility. When excavating a foundation pit on a soft soil foundation, it is often necessary to construct a foundation pit retaining structure to protect the foundation pit.

[0003] Common foundation pit retaining structures for soft soil foundations include a layer of gravel laid on the upper side of the soft soil layer, a trench excavated downwards on the upper surface of the gravel layer, the trench reaching the depth of the soft soil layer, and clay filled into the trench to form a clay water-stop curtain. A foundation pit retaining wall is then installed in the water-stop curtain, with both the inner and outer sides of the retaining wall compacted and fixed by clay. Finally, horizontal supports are installed inside the foundation pit enclosed by the foundation pit retaining wall.

[0004] Regarding the aforementioned technologies, the stone chips within the stone chip layer tend to move outwards under the influence of gravity and the pressure of the stone chips above. Clay easily becomes soft after becoming wet, and stone chip particles are easily squeezed into the clay layer, thereby damaging the water-stop curtain. Summary of the Invention

[0005] To address the issue that stone chips can easily damage the water-stop curtain, this application provides a foundation pit retaining structure for soft soil foundations.

[0006] The first aspect of this application provides a foundation pit retaining structure for soft soil foundations, which adopts the following technical solution:

[0007] A foundation pit retaining structure for soft soil foundation includes a soft soil layer and a gravel layer located above the soft soil layer. A V-shaped trench is provided on the gravel layer, and a clay layer is provided within the trench. A foundation pit retaining wall is provided within the clay layer. An installation frame is provided on the soft soil layer, located below the gravel layer. An interception frame is provided on the installation frame, and the interception frame is connected to the installation frame. An interception net is provided within the interception frame. Both the interception net and the interception frame are located between the gravel layer and the clay layer. A reinforcement component is provided on the upper side of the installation frame, and the reinforcement component is used to provide a tensile force to the interception frame away from the clay layer.

[0008] By adopting the above technical solutions, the interception net can intercept stone particles, thereby reducing the amount of stone particles sliding from the stone layer to the clay layer; at the same time, the interception frame can shape the interception net, reducing its deformation and ensuring the interception effect of the stone particles; the reinforcement component applies a tensile force away from the clay layer to the interception frame, and the cooperation between the interception net and the interception frame can reduce the movement of stone particles towards the clay layer, thereby reducing the amount of stone particles entering the clay layer, and overall improving the problem that stone particles are prone to damaging the water-stop curtain.

[0009] Optionally, the reinforcement component includes a reinforcement plate and a reinforcement rod. Both the reinforcement plate and the reinforcement rod are located on the side of the interception frame away from the clay layer. One end of the reinforcement rod is connected to the interception frame and the other end is connected to the reinforcement plate. The included angle between the reinforcement plate and the mounting frame is an acute angle, and the opening direction of the acute angle is away from the clay layer.

[0010] By adopting the above technical solution, since the reinforcing plate is set at an angle, the stone particles on the upper side of the reinforcing plate can exert a downward pressure on the reinforcing plate under the drive of gravity and the pressure from above. When the reinforcing plate is subjected to the pressure of the stone particles, the pressure has a component force along the length of the reinforcing rod and away from the clay layer. Correspondingly, the reinforcing plate exerts a force on the reinforcing rod away from the interception frame. The reinforcing rod and the interception frame are connected, and the reinforcing plate and the reinforcing rod cooperate to apply a tensile force away from the clay layer to the interception frame, ensuring the stable interception of the stone layer by the interception frame and the interception net.

[0011] Optionally, the reinforcing plate has mounting holes, the reinforcing rod is located in the mounting holes, the reinforcing rod is provided with a reinforcing member, and the reinforcing member is located on the side of the reinforcing plate away from the clay layer.

[0012] By adopting the above technical solution, the reinforcing plate tends to slide out of the reinforcing rod under the pressure applied by the stone slag layer. The reinforcing plate is prevented from sliding out by the reinforcing member, and the reinforcing plate can apply a tensile force away from the clay layer to the reinforcing rod.

[0013] Optionally, the reinforcing rod has a socket at one end away from the interception frame, the reinforcing member includes a plug rod, the plug rod is located in the socket, and the plug rod and the side of the reinforcing plate away from the interception frame abut against each other.

[0014] By adopting the above technical solution, the insertion rod is inserted into the insertion hole, the insertion rod and the reinforcing plate abut against each other, and the insertion rod can lock the reinforcing plate out of the reinforcing rod.

[0015] Optionally, the reinforcing rod is a hollow structural component, with an opening at one end near the intercepting frame, a cement grout layer inside the reinforcing rod, and multiple grouting ports along the length of the reinforcing rod.

[0016] By adopting the above technical solution, the operator can inject cement grout into the reinforcing rod. The cement grout inside the reinforcing rod flows out from the grouting port. When the cement grout flowing out from the grouting port comes into contact with the stone chips, the cement grout flows into the gaps between the stone chip particles. After the cement grout solidifies, it can make the reinforcing rod and the stone chips in the stone chip layer adhere and solidify together, reducing the slippage of the reinforcing rod in the stone chip layer and improving the stability of the reinforcing rod in the stone chip layer.

[0017] Optionally, a grouting groove is provided on the side wall of the insertion rod, and the grouting groove is connected to the interior of the reinforcing rod.

[0018] By adopting the above technical solution, the cement grout inside the reinforcing rod can flow out through the grouting groove. At the same time, the cement grout adheres to the insertion rod and solidifies. Simultaneously, the cement grout can also flow out from the insertion hole, allowing the insertion rod and nearby stone particles to solidify together through the cement grout, further improving the structural strength of the insertion rod.

[0019] Optionally, the grouting groove is arranged around the axis of the insertion rod.

[0020] By adopting the above technical solution, the cement grout solidifies, enhancing the bond between the cement grout and the insertion rod.

[0021] Optionally, multiple mounting brackets, interception frames, and reinforcement components are provided one-to-one along the length of the trench.

[0022] By adopting the above technical solution, the mounting frame, interception frame and reinforcement components work together to intercept the stone slag layer along the length of the trench, reducing the amount of stone slag particles entering the clay layer.

[0023] Optionally, a connector may be provided between two adjacent reinforcing plates.

[0024] By adopting the above technical solution, when a reinforcing plate is subjected to a large tensile force from the intercepting frame, adjacent reinforcing plates apply a tensile force away from the intercepting frame through connectors, ensuring that the reinforcing plate provides a stable tensile force to the intercepting frame, thereby enhancing the stability of the reinforcing plate and improving the stability of the intercepting frame.

[0025] The second aspect of this application provides a construction method for a foundation pit retaining structure on soft soil foundation, which adopts the following technical solution:

[0026] A construction method for a foundation pit retaining structure on soft soil foundation, based on any of the foundation pit retaining structures for soft soil foundations described in the first aspect, includes the following steps:

[0027] S1, Install the mounting frame on the upper side of the soft soil layer;

[0028] S2, Secure the interceptor frame to the mounting bracket;

[0029] S3, fix one end of the reinforcing rod to the interception frame;

[0030] S4, The reinforcing plate is installed onto the reinforcing rod so that one end of the reinforcing rod passes through the mounting hole;

[0031] S5, insert the plug into the socket, and make the side of the reinforcing plate away from the interception frame abut against the plug;

[0032] S6, Lay a layer of stone chips on the mounting frame, so that the stone chips layer is located on the side of the interception frame close to the reinforcing plate, so that the stone chips layer covers the reinforcing plate and the reinforcing rod, and form a groove on the side of the interception frame away from the reinforcing plate.

[0033] S7. Inject cement grout into the opening of the reinforcing rod, so that the cement grout flows out from the insertion hole and the grouting port, and wait for the cement grout to solidify.

[0034] S8. Fill the side of the interception frame away from the reinforcing plate with a clay layer and compact and fix the clay layer.

[0035] S9, construct a retaining wall for the foundation pit within the clay layer.

[0036] By adopting the above technical solution, trenches are directly formed and filled with clay, reducing the intensity of construction.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. When the stone chips in the stone chip layer slide down into the clay layer under the force of gravity and the pressure from above, the intercepting net can intercept the stone chip particles, thereby reducing the number of stone chip particles sliding into the clay layer; at the same time, the intercepting frame can shape the intercepting net, reducing the deformation of the net and ensuring the interception effect of the net on the stone chip particles; the reinforcing component applies a tensile force away from the clay layer to the intercepting frame, and the cooperation between the intercepting net and the intercepting frame can reduce the movement of stone chip particles into the clay layer, thereby reducing the number of stone chip particles entering the clay layer, and overall improving the problem that stone chip particles are prone to damaging the water-stop curtain;

[0039] 2. Driven by gravity and upward pressure, the stone chips can exert a downward pressure on the reinforcing plate. When the reinforcing plate is subjected to the pressure of the stone chips, it can decompose a pressure along the length of the reinforcing rod and away from the clay layer. The stone chips can exert a pressure on the reinforcing plate away from the clay layer. Correspondingly, the reinforcing plate exerts a pressure on the reinforcing rod away from the interception frame. The reinforcing rod and the interception frame are connected, and the reinforcing plate and the reinforcing rod cooperate to apply a tensile force to the interception frame away from the clay layer, ensuring the stable interception of the stone chip layer by the interception frame and the interception net.

[0040] 3. Operators can inject cement grout into the reinforcing rod. The cement grout inside the reinforcing rod flows out from the grouting port. When the cement grout flowing out from the grouting port comes into contact with the stone chips, the cement grout flows into the gaps between the stone chip particles. After the cement grout solidifies, it can make the reinforcing rod and the stone chips in the stone chip layer adhere and solidify together, reducing the slippage of the reinforcing rod in the stone chip layer and improving the stability of the reinforcing rod in the stone chip layer. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0043] Figure 2 This is a partial structural diagram to show the location of the mounting bracket;

[0044] Figure 3 This is a partial structural diagram to demonstrate the connection of the mounting bracket;

[0045] Figure 4 This is a partial structural diagram to illustrate the connection of the reinforcing rods;

[0046] Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0047] Figure 6 This is a partial structural diagram created to illustrate the insert structure.

[0048] Reference numerals: 1. Soft soil layer; 2. Stone slag layer; 3. Trench; 31. Clay layer; 32. Foundation pit retaining wall; 4. Mounting frame; 41. Mating hole; 42. Fixing rod; 5. Interception frame; 51. Frame; 52. Diagonal brace; 521. Fixing hole; 6. Interception net; 7. Reinforcement component; 71. Reinforcement plate; 72. Reinforcement rod; 721. Fixing ring; 722. Insertion hole; 723. Grouting port; 8. Reinforcement component; 81. Grouting groove; 9. Connector; 10. Connecting ring. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0050] This application discloses a foundation pit retaining structure for soft soil foundations. (Refer to...) Figure 1 , Figure 2 and Figure 3 The foundation pit retaining structure of this soft soil foundation includes a soft soil layer 1 on the ground and a stone slag layer 2 laid on the upper side of the soft soil layer 1. A trench 3 is provided above the stone slag layer 2. The trench 3 is long and narrow with a V-shaped cross-section. The trench 3 is filled with clay, thus forming a clay layer 31 within the trench 3. A foundation pit retaining wall 32 is constructed within the clay layer 31. The length direction of the foundation pit retaining wall 32 is consistent with the length direction of the trench 3, and the lower side of the foundation pit retaining wall 32 is submerged in the soft soil layer 1. The clay layer 31 is located on both sides of the foundation pit retaining wall 32, forming a water-stop curtain on both sides of the foundation pit retaining wall 32. A horizontal mounting frame 4 is installed on the upper side of the soft soil layer 1. An inclined intercepting frame 5 is welded to the upper side of the mounting frame 4 near the clay layer 31. The clay layer 31 and the stone slag layer 2 are located on opposite sides of the intercepting frame 5. An intercepting net 6 is welded to the side of the intercepting frame 5 near the stone slag layer 2. The height of the interception frame 5 gradually increases from the clay layer 31 toward the stone slag layer 2. A reinforcing component 7 is provided on the upper side of the mounting frame 4. The reinforcing component 7 is used to provide a tensile force to the interception frame 5 away from the clay layer 31. When the stone particles in the stone layer 2 slide down towards the clay layer 31 under the influence of gravity and the pressure from above, the stone particles exert a pressure away from the stone layer 2 on the intercepting net 6 and the intercepting frame 5. The intercepting net 6 can intercept the stone particles, making it difficult for them to pass through the mesh of the intercepting net 6, thereby reducing the number of stone particles sliding towards the clay layer 31. At the same time, the intercepting frame 5 can shape the intercepting net 6, reducing the deformation of the intercepting net 6 and ensuring the interception effect of the intercepting net 6 on the stone particles. The reinforcing component 7 applies a tensile force away from the clay layer 31 to the intercepting frame 5, ensuring the stability of the intercepting frame 5. The intercepting net 6 and the intercepting frame 5 work together to reduce the movement of stone particles towards the clay layer 31, thereby reducing the number of stone particles entering the clay layer 31 and improving the overall problem of stone particles easily damaging the water-stop curtain.

[0051] Reference Figure 1 and Figure 4 The mounting frame 4 is a steel frame with four mating holes 41. A fixing rod 42 is inserted into each mating hole 41. The fixing rod 42 can also be an expansion bolt. The fixing rod 42 is vertical, with its lower end inserted into the soft soil layer 1. The fixing rod 42 reduces the horizontal slippage of the mounting frame 4 and its movement in the soft soil layer 1, improving the stability of the mounting frame 4 and thus achieving initial fixation. During construction, the operator can also set more mating holes 41 and fixing rods 42 as needed.

[0052] The interception frame 5 includes a frame 51 and diagonal braces 52. The frame 51 is rectangular, and the edge of the interception net 6 is welded to the frame 51. There are two diagonal braces 52, and the two ends of the diagonal braces 52 are welded to two opposite corners of the frame 51. The two diagonal braces 52 intersect and are welded to each other. A fixing hole 521 is opened at the intersection of the two diagonal braces 52. The reinforcement component 7 includes a reinforcement plate 71 and a reinforcement rod 72. The reinforcement rod 72 is located in the stone slag layer 2, and one end of the reinforcement rod 72 passes through the fixing hole 521. A fixing ring 721 is cast on the side wall of the end of the reinforcement rod 72 near the clay layer 31. The fixing ring 721 abuts against the side of the interception frame 5 near the clay layer 31. When the interception frame 5 and the interception net 6 are subjected to a tensile force toward the clay layer 31, the fixing ring 721 can intercept the interception frame 5, so that the interception frame 5 applies a tensile force toward the reinforcement rod 72 near the clay layer 31.

[0053] Reference Figure 4 and Figure 5 The reinforcing rod 72 is perpendicular to the intercepting frame 5 and is welded to the intercepting frame 5 at the fixing hole 521. The reinforcing plate 71 is located on the side of the intercepting frame 5 away from the clay layer 31 and is located inside the stone slag layer 2. The reinforcing plate 71 has an installation hole, and the end of the reinforcing rod 72 away from the intercepting frame 5 passes through the installation hole. The reinforcing rod 72 is provided with a reinforcing member 8, which is used to prevent the reinforcing plate 71 from slipping off the reinforcing rod 72.

[0054] The reinforcing rod 72 is perpendicular to the reinforcing plate 71. The height of the reinforcing plate 71 gradually increases from the clay layer 31 toward the stone slag layer 2. The end of the reinforcing rod 72 away from the intercepting frame 5 has an insertion hole 722. The reinforcing part 8 is a plug rod installed in the insertion hole 722. The plug rod abuts against the side of the reinforcing plate 71 away from the intercepting plate. The reinforcing plate 71 and the plug rod are welded to each other at the abutting point.

[0055] The included angle between the reinforcing plate 71 and the mounting bracket 4 is an acute angle, and the direction of the included angle between the reinforcing plate 71 and the mounting bracket 4 is away from the clay layer 31. The included angle between the reinforcing plate 71 and the mounting bracket can be between 30 and 60 degrees. When the upper side of the reinforcing plate 71 is subjected to downward pressure from the stone slag layer 2, it can ensure that the pressure exerted by the stone slag layer 2 on the reinforcing plate 71 has a component force away from the clay layer 31, so that the reinforcing plate 71 has a tendency to move away from the clay layer 31.

[0056] The reinforcing plate 71 tends to extend away from the intercepting frame 5 along the length of the reinforcing rod 72. Correspondingly, the reinforcing plate 71 can apply a tensile force away from the intercepting frame 5 to the insert rod, and the insert rod can apply a tensile force away from the intercepting frame 5 to the reinforcing rod 72, thereby ensuring the stability of the intercepting frame 5. The reinforcing plate 71 is connected to the mounting bracket 4, making the intercepting frame 5 more stable. For example, the reinforcing plate 71 can be connected to the mounting bracket 4 by bolts.

[0057] Reference Figure 5 and Figure 6 The reinforcing rod 72 is a hollow tube, and its length can be one to three meters. The end of the reinforcing rod 72 near the intercepting frame 5 has an opening, which reduces the cost of the reinforcing rod 72. The operator can inject cement grout into the reinforcing rod 72 through the opening, thereby forming a cement grout layer inside the reinforcing rod 72. The cement grout layer inside the reinforcing rod 72 increases the strength of the reinforcing rod 72 and ensures the stability of the reinforcing rod 72 in pulling on the intercepting frame 5.

[0058] The reinforcing rod 72 has multiple grouting ports 723 along its length, arranged around its axis. When the operator injects cement grout into the reinforcing rod 72, the grout flows out through the ports 723, allowing the stone chips near the outside of the reinforcing rod 72 to come into contact with the cement grout. Since there are gaps between the stone chips, the cement grout penetrates these gaps. After the cement grout on the outside of the reinforcing rod 72 solidifies, it bonds the reinforcing rod 72 and the stone chips on its outer side together, reducing movement of the reinforcing rod 72 within the stone chip layer 2. This also reduces movement of the reinforcing rod 72 under tension, thus improving its stability.

[0059] The insertion hole 722 and the reinforcing rod 72 are internally connected. When the operator injects cement grout into the reinforcing rod 72, the cement grout can come into contact with the insertion rod inserted into the insertion hole 722. A grouting groove 81 is provided on the side wall of the insertion rod. After the insertion rod is inserted into the insertion hole 722, the cement grout in the reinforcing rod 72 can flow out of the insertion hole 722 through the grouting groove 81, thereby allowing the cement grout to penetrate into the gaps between the stone particles near the insertion rod. When the cement grout solidifies, it can make the insertion rod and the stone particles near the insertion rod form a whole, improving the structural strength of the insertion rod. The insertion rod and the stone particles around the insertion rod can firmly abut against the side of the reinforcing plate 71 away from the intercepting frame 5.

[0060] The grouting grooves 81 are spirally distributed around the axis of the insertion rod. Multiple grouting grooves 81 can be opened on the insertion rod. After the cement grout in the reinforcing rod 72 solidifies, the solidified cement grout layer in the grouting groove 81 is spiral, which enhances the firmness of the connection between the cement grout layer and the insertion rod.

[0061] Reference Figure 1 and Figure 3 Multiple mounting frames 4, intercepting frames 5, and reinforcing components 7 are provided along the length of the trench 3, with two sets of mounting frames 4, intercepting frames 5, and reinforcing components 7 on both sides of the trench 3. The distance between the intercepting frames 5 on both sides of the trench 3 gradually increases from bottom to top, causing the width of the trench 3 to gradually decrease from top to bottom. Correspondingly, the width of the clay layer 31 gradually decreases from top to bottom. The mounting frames 4, intercepting frames 5, and reinforcing components 7 work together to intercept the stone chip layer 2 along the length of the trench 3, reducing the amount of stone chip particles entering the clay layer 31.

[0062] The intercepting net 6 can be made of wire mesh, which has good plasticity and can effectively intercept stone particles. There is a certain gap between the two intercepting frames 5 located on the same side of the trench 3. The size of the intercepting net 6 can be larger than the size of the intercepting frame 5, allowing the intercepting net 6 to rest against the side of the adjacent intercepting frame 5 away from the clay layer 31. When stone particles rest against the intercepting net 6, this increases the friction between the intercepting net 6 and the adjacent intercepting frame 5, reducing the likelihood of the intercepting net 6 slipping off the frame 5. This ensures the intercepting effect of the intercepting net 6 on the stone particles.

[0063] A connector 9 is provided between two adjacent reinforcing plates 71 located on the same side of the trench 3. The two reinforcing plates 71 are connected by the connector 9. When the tension from the interception frame 5 on one reinforcing plate 71 is large, the adjacent reinforcing plates 71 apply a tension away from the interception frame 5 through the connector 9. This ensures that the reinforcing plate 71 provides a stable tension to the interception frame 5, thereby enhancing the stability of the reinforcing plate 71 and improving the stability of the interception frame 5. This ensures that the interception frame 5 and the interception net 6 can stably intercept stone particles.

[0064] Reference Figure 4 and Figure 5 A connecting ring 10 is welded to the side of the reinforcing plate 71 near the intercepting frame 5. The connecting member 9 is a connecting rod inserted into the connecting ring 10. Several coaxial connecting rods form a group. Each connecting rod is inserted into the connecting ring 10 on at least two reinforcing plates 71. There are four connecting rings 10 on the reinforcing plate 71. Two connecting rings 10 form a group. Each group of connecting rings 10 is coaxial. There are two groups of connecting rods corresponding to each connecting ring 10. The two groups of connecting rods are staggered. More groups of connecting rods can be set as needed. Each group of connecting rods is parallel. When one of the reinforcing plates 71 tends to move towards the intercepting frame 5, the connecting rod can abut against the reinforcing plate 71, improving the stability of the reinforcing plate 71.

[0065] The implementation principle of the foundation pit retaining structure for soft soil foundation in this application embodiment is as follows: When the stone chips in the stone chip layer 2 are driven by gravity and the pressure from the upper side to slide down to the clay layer 31, the intercepting net 6 can intercept the stone chip particles, thereby reducing the stone chip particles sliding towards the clay layer 31; at the same time, the intercepting frame 5 can shape the intercepting net 6, reduce the deformation of the intercepting net 6, and ensure the interception effect of the intercepting net 6 on the stone chip particles; the reinforcing component 7 applies a tensile force away from the clay layer 31 to the intercepting frame 5. The intercepting net 6 and the intercepting frame 5 work together to reduce the movement of stone chip particles towards the clay layer 31, thereby reducing the stone chip particles entering the clay layer 31, and improving the problem that stone chip particles are prone to damaging the water-stop curtain.

[0066] This application also discloses a construction method for a foundation pit retaining structure on soft soil foundation, based on the aforementioned foundation pit retaining structure for soft soil foundation. (Refer to...) Figure 1 The construction method for the retaining structure of the foundation pit on the soft soil foundation includes the following steps:

[0067] S1, level the soft soil layer 1, install the mounting frame 4 on the soft soil layer 1, then pass the lower end of the reinforcing rod 72 through the mating hole 41 and insert it into the soft soil layer 1, and set the mounting frame 4 in two parallel rows;

[0068] S2, which keeps the interception frame 5 tilted, so that the distance between the two rows of interception frames 5 gradually increases from bottom to top, and so that the interception frame 5 is welded to the mounting bracket 4;

[0069] S3, pass one end of the reinforcing rod 72 through the fixing hole 521, so that the fixing ring 721 abuts against and is welded to the interception frame 5;

[0070] S4, the end of the reinforcing rod 72 away from the interceptor frame 5 passes through the mounting hole;

[0071] S5, insert the plug rod into the plug hole 722, weld the plug rod and the side of the reinforcing plate 71 away from the interception frame 5 together, and then insert the connecting rod into the connecting ring 10 so that the two sets of connecting rods are misaligned;

[0072] S6, a stone chip layer 2 is laid in the area enclosed by the upper side of the mounting frame 4 and the side of the intercepting frame 5 near the mounting frame 4, so that the stone chip layer 2 covers the reinforcing plate 71 and the reinforcing rod 72, and a groove 3 is formed on the side of the intercepting frame 5 away from the stone chip layer 2.

[0073] S7, inject cement grout into the reinforcing rod 72 through the opening at one end of the reinforcing rod 72 near the intercepting frame 5, so that the cement grout flows out of the reinforcing rod 72 from the grouting port 723 and the grouting groove 81, and wait for the cement grout to solidify;

[0074] S8, fill the trench 3 with clay and compact and fix the clay so that the upper height of the clay layer 31 is parallel to the height of the stone slag layer 2.

[0075] S9, excavate and construct a retaining wall 32 in the clay layer 31, so that the clay layer 31 in the trench 3 is located on both sides of the retaining wall 32, and the lower side of the retaining wall 32 is submerged in the soft soil layer 1.

[0076] The implementation principle of the construction method of the foundation pit retaining structure for soft soil foundation in this application embodiment is as follows: First, install the mounting frame 4 and the intercepting frame 5 on the upper side of the soft soil layer 1. Then, lay the stone slag layer 2 in the area between the intercepting frame 5 and the mounting frame 4. The intercepting frame 5 intercepts the stone slag layer 2, thereby forming a trench 3 between the two rows of intercepting frames 5. There is no need to excavate the trench 3 on the stone slag layer 2. Finally, lay the clay layer 31 in the trench 3. Then, build the foundation pit retaining wall 32 on the clay layer 31. The foundation pit is maintained by the foundation pit retaining wall 32, so that the clay layer 31 forms a water-stop curtain on both sides of the foundation pit retaining wall 32.

[0077] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0078] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A foundation pit retaining structure for soft soil foundation, comprising a soft soil layer (1) and a stone slag layer (2) located on the upper side of the soft soil layer (1), wherein a trench (3) is provided on the stone slag layer (2), the trench (3) is V-shaped, a clay layer (31) is provided in the trench (3), and a foundation pit retaining wall (32) is provided in the clay layer (31), characterized in that: An installation frame (4) is provided on the soft soil layer (1). The installation frame (4) is located below the stone slag layer (2). An interception frame (5) is provided on the installation frame (4). The interception frame (5) is connected to the installation frame (4). An interception net (6) is provided inside the interception frame (5). The interception net (6) and the interception frame (5) are both located between the stone slag layer (2) and the clay layer (31). A reinforcement component (7) is provided on the upper side of the installation frame (4). The reinforcement component (7) is used to provide a tensile force to the interception frame (5) away from the clay layer (31). The reinforcement component (7) includes a reinforcement plate (71) and a reinforcement rod (72). The reinforcement plate (71) and the reinforcement rod (72) are both located on the interception frame (5) away from the clay layer (31). On one side, one end of the reinforcing rod (72) is connected to the interception frame (5), and the other end is connected to the reinforcing plate (71). The included angle between the reinforcing plate (71) and the mounting frame (4) is an acute angle, and the opening direction of the acute angle is away from the clay layer (31). The reinforcing plate is inclined. Under the drive of gravity and the pressure from the upper side, the stone particles on the upper side of the reinforcing plate can exert a downward pressure on the reinforcing plate. When the reinforcing plate is subjected to the pressure of the stone particles, the pressure has a component force along the length of the reinforcing rod and away from the clay layer. Correspondingly, the reinforcing plate exerts a force on the reinforcing rod away from the interception frame. The reinforcing rod and the interception frame are connected, and the reinforcing plate and the reinforcing rod cooperate to exert a tensile force on the interception frame away from the clay layer, ensuring the stable interception of the stone layer by the interception frame and the interception net.

2. The foundation pit retaining structure for soft soil foundation according to claim 1, characterized in that: The reinforcing plate (71) has an installation hole, the reinforcing rod (72) is located in the installation hole, the reinforcing rod (72) is provided with a reinforcing part (8), and the reinforcing part (8) is located on the side of the reinforcing plate (71) away from the clay layer (31).

3. The foundation pit retaining structure for soft soil foundation according to claim 2, characterized in that: The reinforcing rod (72) has a socket (722) at one end away from the interception frame (5). The reinforcing member (8) includes a plug rod, which is located in the socket (722), and the plug rod and the side of the reinforcing plate (71) away from the interception frame (5) abut against each other.

4. The foundation pit retaining structure for soft soil foundation according to claim 3, characterized in that: The reinforcing rod (72) is a hollow structural component. The end of the reinforcing rod (72) near the intercepting frame (5) has an opening. The reinforcing rod (72) has a cement grout layer inside and multiple grouting ports (723) are provided on the reinforcing rod (72) along the length direction of the reinforcing rod (72).

5. The foundation pit retaining structure for soft soil foundation according to claim 4, characterized in that: A grouting groove (81) is provided on the side wall of the insertion rod, and the grouting groove (81) and the reinforcing rod (72) are connected internally.

6. The foundation pit retaining structure for soft soil foundation according to claim 5, characterized in that: The grouting groove (81) is arranged around the axis of the insert rod.

7. The foundation pit retaining structure for soft soil foundation according to claim 1, characterized in that: The mounting bracket (4), the interception frame (5), and the reinforcement component (7) are all provided in multiple corresponding positions along the length direction of the groove (3).

8. The foundation pit retaining structure for soft soil foundation according to claim 7, characterized in that: A connector (9) is connected between two adjacent reinforcing plates (71).

9. A construction method for a foundation pit retaining structure on soft soil foundation, used for constructing the foundation pit retaining structure on soft soil foundation as described in claim 7, characterized in that: Includes the following steps: S1, Install the mounting frame (4) on the upper side of the soft soil layer (1). S2, fix the interceptor frame (5) on the mounting bracket (4); S3, fix one end of the reinforcing rod (72) to the interception frame (5); S4, the reinforcing plate (71) is installed on the reinforcing rod (72) so that one end of the reinforcing rod (72) passes through the mounting hole; S5, insert the plug into the socket (722) and make the side of the reinforcing plate (71) away from the interceptor frame (5) abut against the plug; S6, lay a stone chip layer (2) on the mounting frame (4) so ​​that the stone chip layer (2) is located on the side of the interception frame (5) close to the reinforcing plate (71) and the stone chip layer (2) covers the reinforcing plate (71) and the reinforcing rod (72), and form a groove (3) on the side of the interception frame (5) away from the reinforcing plate (71). S7, inject cement grout into the reinforcing rod (72) through the opening of the reinforcing rod (72), so that the cement grout flows out from the insertion hole (722) and the grouting port (723) and wait for the cement grout to solidify; S8, fill the side of the interception frame (5) away from the reinforcing plate (71) with clay layer (31) and compact and fix the clay layer (31); S9, construct a retaining wall (32) for the foundation pit within the clay layer (31).

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