Soil retaining and water stopping device suitable for round pile foundation pit supporting in soft soil area

Abstract

The utility model discloses a soil retaining and water stopping device suitable for supporting a round pile foundation pit in a soft soil area. The soil retaining and water stopping device is composed of a first connecting piece, a second connecting piece and a corner assembly. The first connecting piece and the second connecting piece are connected with the corner assembly and encircle a strip-shaped steel chain along the outer surface of the foundation pit circular pile; the first connecting piece, the second connecting piece and the corner assembly are all semi-arc-shaped steel bodies. The semi-arc-shaped inner surface of the first connecting piece is attached to the outer surface of a cylinder in the foundation pit. The second connecting piece is arranged between the cylinders in the foundation pit and is connected with the first connecting piece through a connector; the semi-arc-shaped inner surface of the corner assembly is attached to the cylindrical outer surface of the corner in the foundation pit and connected with the first connecting piece and the second connecting piece through connectors. The utility model has the advantages of reasonable structure, ingenious design and good shear resistance; the method is suitable for building industry popularization.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering, and more particularly to an earth retaining and water stop device suitable for circular pile foundation pit support in soft soil areas. Background Art

[0002] The soil quality in soft soil areas is characterized by a high groundwater level and poor mechanical properties of the soil mass. The pile bodies of the circular pile foundation pit construction method are discontinuous, and gaps are generated between the piles. At least one or two layers of cement-soil mixing piles or high-pressure jet grouting piles need to be constructed continuously on the outside as a water stop curtain for water stop. At the same time, during the excavation process, the gaps between the circular piles need to be reinforced with implanted bars, secondary pouring or grouting to seal the concrete. If not sealed, disasters such as collapse and water seepage of the soil between the circular piles of the foundation pit will occur. In severe cases, soil loss will occur, and the settlement outside the pit will affect the safety of surrounding buildings. In addition, the construction cost of the water stop curtain outside the pit is relatively high, the maintenance period is relatively long, and the cement slurry cannot be recovered after being injected into the soil. The occupied area of the foundation pit is relatively large, causing pollution to a large area of soil, which does not conform to the concept of green environmental protection in engineering construction. The above disadvantages affect the construction period and construction quality of the foundation pit excavation.

[0003] Therefore, the engineering field urgently needs an earth retaining and water stop device suitable for circular pile foundation pits in soft soil areas. This device should have the functions of a water stop curtain and preventing the loss of soil between the piles, and at the same time have the characteristics of fast construction speed, recyclability, and multiple uses. However, the current industry dilemma has not been well solved. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides an earth retaining and water stop device suitable for circular pile foundation pit support in soft soil areas; the technical problem to be solved is to overcome the problems of high cost of the water stop curtain for circular pile foundation pit support in soft soil areas, long construction period, collapse of soil between piles, soil pollution, and non-recyclability.

[0005] In order to solve the problems in the prior art, the present invention adopts the following technical solutions:

[0006] An earth retaining and water stop device suitable for circular pile foundation pit support in soft soil areas, the earth retaining and water stop device is composed of a first connecting member, a second connecting member and a corner assembly; the first connecting member, the second connecting member and the corner assembly are connected and form a belt-shaped steel chain along the outer surface of the circular pile of the foundation pit; the first connecting member, the second connecting member and the corner assembly are all semi-circular steel bodies; wherein: the inner surface of the semi-circular first connecting member fits with the outer surface of the cylindrical column in the foundation pit; the second connecting member is arranged between the cylindrical columns in the foundation pit and is connected to the first connecting member through a connecting head; the inner surface of the semi-circular corner assembly fits with the outer surface of the cylindrical column at the corner in the foundation pit; the corner assembly is respectively connected to the first connecting member and the second connecting member through a connecting head.

[0007] Further, the radian of the semi-circular steel bodies of the first connecting member and the second connecting member is centered on the semi-arc of a single circular pile in the foundation pit; both ends of the semi-circular steel body are provided with connecting heads; the connecting heads are composed of a smooth part and a curved surface part to form an elliptical end.

[0008] Further, the radian of the semi-circular steel body of the corner assembly is centered on the semi-arc of the corner circular pile formed by the cylinders in the foundation pit; both ends of the semi-circular steel body are provided with connecting heads; the connecting heads are composed of a smooth part and a curved surface part to form an elliptical end.

[0009] Beneficial effects

[0010] Compared with the traditional technical solution, the beneficial effects brought by the present invention are as follows:

[0011] 1. In the present utility model, the first connecting member, the second connecting member and the corner assembly adopt an arc shape, which not only helps to increase the stiffness of the component, prevent the component from bending along the length direction during transportation and construction, but also can tightly fit the pile body of the foundation pit support after driving, enabling the component to still maintain its shape in the soil, and the stress condition is as Figure 6 shown. The assembly operation efficiency of the present utility model is high, the installation is fast, and after the assembly is completed, no maintenance is required, and the foundation pit can be excavated immediately;

[0012] 2. In the present utility model, the first connecting member, the second connecting member and the corner assembly conform to the relevant mechanical principles, the force is evenly distributed, and the force of the soil outside the foundation pit acts on the first connecting member and the second connecting member evenly; the first connecting member and the second connecting member are closely attached to the circular pile, conducting the force to the pile body, and the force transmission path is efficient and clear, without generating concentrated stress, thereby protecting the overall stiffness and practicability of the pile body;

[0013] 3. The structure of the present utility model is reasonable, the design is ingenious, and the shear resistance performance is good; at the same time, during the construction process, the occupied space is small, and the transportation, installation and disassembly of large mechanical equipment such as mixing pile machines are not required; the cost is low; it is suitable for popularization in the construction industry. Brief description of the drawings

[0014] Figure 1 It is a three-dimensional schematic diagram of the soil retaining and water stop device of the present invention after assembly;

[0015] Figure 2 It is a plan schematic diagram of the soil retaining and water stop device of the present invention after assembly;

[0016] Figure 3 It is a three-dimensional drawing of the standard part of the soil retaining and water stop device of the present invention;

[0017] Figure 4 It is a plan view of the standard part of the soil retaining and water stop device of the present invention;

[0018] Figure 5Plan view of the corner piece of the retaining and water-stop device of the present invention;

[0019] Figure 6 Plan view of the joint of the retaining and water-stop device of the present invention;

[0020] Figure 7 Plan view of the force-bearing of the retaining and water-stop device of the present invention;

[0021] Figure 8 Plan view of the force-bearing of the joint of the retaining and water-stop device of the present invention;

[0022] Figure 9 Other example diagrams of the retaining and water-stop device of the present invention.

[0023] Reference numerals

[0024] 101 - First connecting piece, 201 - Second connecting piece, 301 - Corner assembly, (401, 402) - Connector

[0025] 411 - Flat part, 412 - Curved part, 500 - Foundation pit Detailed implementation manners

[0026] The following is an explanation of the present invention with reference to the accompanying drawings:

[0027] This example is implemented on the premise of the technical solution of the present invention, and gives detailed implementation manners and specific operation procedures, but the protection scope of the present invention is not limited to the following examples.

[0028] As Figures 1 to 9 shown, considering the simplification, standardization, and rapidity of foundation pit support, and at the same time in order to reduce the manufacturing cost of foundation pit support construction, reduce construction procedures and thus shorten the construction period, etc., the present invention provides a retaining and water-stop device applicable to circular pile foundation pit support in soft soil areas. The retaining and water-stop device is composed of a first connecting piece 101, a second connecting piece 201, and a corner assembly 301; the first connecting piece 101, the second connecting piece 201, and the corner assembly 301 are connected and form a strip-shaped steel chain along the outer surface of the circular pile of the foundation pit 500; wherein: the semi-circular inner surface of the first connecting piece 101 fits with the outer surface of the cylindrical column in the foundation pit 500; the second connecting piece 201 is arranged between the cylindrical columns in the foundation pit 500 and connects the first connecting piece 101 through a connector 301; wherein:

[0029] As Figures 3 to 6As shown, the first connecting member 101, the second connecting member 201, and the corner assembly 301 are all semi-circular steel bodies. The radian of the semi-circular steel bodies of the first connecting member 101 and the second connecting member 201 is centered on the semi-arc of a single round pile in the foundation pit 500; both ends of the semi-circular steel body are provided with connecting heads (401; 402); the connecting heads (401, 402) are composed of a smooth part 411 and a curved surface part 412 to form an elliptical end; the radian of the semi-circular steel body of the corner assembly 301 is centered on the semi-arc of the corner round pile formed by the cylindrical shape surrounded by the round piles in the foundation pit.

[0030] As Figures 7 to 8 shown, during operation, the first connecting member 101, the second connecting member 201, and the corner assembly 301 are subjected to the action of the lateral earth pressure and the resistance of the retaining pile. At this time, the earth pressure received by the second connecting member 201 that does not fit the round pile will be transmitted to the first connecting member 101 and the corner assembly 301 that fit the round pile. See the force transmission schematic diagram in Figure 8 , at this time, the connecting heads (401; 402) will be pulled against each other under the two acting forces, making the first connecting member 101 and the corner assembly 301 tighter and tighter. The greater the earth pressure, the better the connection condition of the connecting head 301, and the corresponding waterproof effect is also better.

[0031] The first connecting member 101 and the second connecting member 201 are made of steel structure with the material of Q235. Appropriate specifications should be selected or prefabricated in the factory. The first connecting member 101 and the second connecting member 201 are arc-shaped, which can not only ensure the stiffness of the component, but also tightly fit to the round pile of the foundation pit support to prevent the deformation of the soil retaining and waterproof device. In the present utility model, the fitting lengths of the first connecting member 101 and the second connecting member with the round pile are both 500 mm, the angle with the center of the round pile as the arc is 71°, the width of each first connecting component 101 and the second connecting component 201 is 535 mm, and the dimension thickness is 11 mm.

[0032] The material and thickness of the corner assembly 301 are the same as those of the first connecting member and the second connecting member. The shape is semi-circular arc, and the fitting length with the round pile is 1120 mm. When the shape surrounded by the cylinders in the foundation pit is a square, the angle of the semi-arc of the corner assembly with the center of the corner round pile is 90° + 71° = 161°. Similarly, when the shape surrounded by the cylinders in the foundation pit is a polygon, the angle of the semi-arc of the corner assembly with the center of the corner round pile is 45° + 71° = 116°. In this example, the diameter of the round pile is 800 mm, and the width of the corner pile 2 is 870 m, as Figure 9 shown.

[0033] The connector (401, 402) is an integral structure with the first connector 101, the second connector 201 and the corner assembly 301. The connector (401, 402) has one side that is flat as a flat portion and one side that is elliptical as a curved portion. The connector (401, 402) tightly connects the first connector 101, the second connector 201 and the corner assembly 301 through the flat portion 411 and the curved portion 412. At the same time, the curved portion is at an angle of 135°, and the two rounded corners of the connector correspond to each other, so that the first connector 101, the second connector 201 and the corner assembly 301 are firmly hooked together. Figures 6 to 8 In addition, in the utility model, relevant sealing grease (butter, etc.) is applied to the gap between the connectors before construction, and the water-stopping ability can be improved after construction.

[0034] The utility model has many applicable forms. The utility model mainly describes the implementation form of splicing and installing a round pile with a diameter of 800mm, a spacing of 1000mm, a first connector 101, and a second connector 201 with a width of 530mm. In this case, the specifications and dimensions of the first connector 101 that fits the round pile and the second connector 201 that does not fit the round pile can be consistent. The component form of the earth-retaining and water-stopping device is not limited to this size, and earth-retaining and water-stopping devices of other sizes and shapes can also be implemented. The component size can be adjusted according to the actual size, such as Figure 9 shown.

[0035] When the utility model is used to construct a soil retaining and water stopping device, the construction sequence is as follows:

[0036] 1. Calculate the required dimensions, specifications and quantity of soil retaining and water stopping devices according to the site conditions and design drawings.

[0037] 2. Connect with local manufacturers to select components or process and manufacture components.

[0038] 3. Transport to the construction site and stack in accordance with relevant specifications without exceeding the limit.

[0039] 4. Construct the foundation pit support round piles according to the drawings and specifications. After the strength reaches the specification requirements, use machinery to inject the soil retaining and water stopping device. In the straight section, inject the first connector and the second connector, and inject the corner component in the corner section. The screen-type injection method can be used to ensure that the connector is closed during the injection process. (Or when injecting the foundation pit support round piles, inject the soil retaining and water stopping device in advance. In this construction sequence, the mold release agent should be applied to the first connector 1 or the corner component 2 in advance to facilitate the demoulding and extraction later).

[0040] 5. After the injection is completed, excavate the soil inside the foundation pit.

[0041] 6. After the excavation is completed, construction of structures in the foundation pit will be carried out.

[0042] 7. After the project construction is completed, backfill to the top of the foundation pit according to the design requirements, and then pull out the soil retaining and water stop device for recycling.

[0043] Although the present invention has been described above, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many modifications without departing from the purpose of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A soil retaining and water stopping device applicable to the foundation pit support of round piles in soft soil areas, characterized in that: The retaining and water-stop device is composed of a first connecting piece, a second connecting piece and a corner assembly; the first connecting piece, the second connecting piece and the corner assembly are connected and form a strip-shaped steel chain along the outer surface of the circular pile of the foundation pit; the first connecting piece, the second connecting piece and the corner assembly are all semi-circular steel bodies; wherein: The semi-circular inner surface of the first connecting piece fits the outer surface of the middle cylinder of the foundation pit; the second connecting piece is arranged between the middle cylinders of the foundation pit and is connected to the first connecting piece through a connecting head; the semi-circular inner surface of the corner assembly fits the outer surface of the cylinder at the corner of the foundation pit; the corner assembly is respectively connected to the first connecting piece and the second connecting piece through a connecting head.

2. The soil retaining and water stop device for circular pile foundation pit support applicable to soft soil areas according to claim 1, characterized in that: The radian of the semi-circular steel bodies of the first connecting piece and the second connecting piece is centered on the semi-arc of a single circular pile in the foundation pit; both ends of the semi-circular steel body are provided with connecting heads; the connecting head is composed of a smooth part and a curved part to form an elliptical end.

3. The soil retaining and water stop device for circular pile foundation pit support applicable to soft soil areas according to claim 1, characterized in that: The radian of the semi-circular steel body of the corner assembly is centered on the semi-arc of the corner circular pile formed by the cylinders in the foundation pit; both ends of the semi-circular steel body are provided with connecting heads; the connecting head is composed of a smooth part and a curved part to form an elliptical end.

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