Modular foundation pit supporting structure of soft soil confined water layer and construction method

Abstract

The application discloses a soft soil confined water layer modular foundation pit supporting structure and a construction method. The supporting structure comprises a supporting assembly and a connecting assembly. The supporting assembly comprises a freezing pile, a first freezing pipe, a connecting pipe, a connecting rod and a supporting steel bar. The freezing pile is located at the bottom wall of the foundation pit. The first freezing pipe is fixed in the freezing pile. The connecting pipe is communicated with the two ends of the first freezing pipe. The top of the freezing pile is provided with a pre-buried hole. The connecting rod is inserted into the pre-buried hole. The supporting steel bar is fixed at the top end of the connecting rod. The connecting assembly is arranged on the freezing pile. The construction method has the advantages of large construction quality tolerance, low cost, small pollution, high convenience and stability of the supporting construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to a soft soil confined water layer modular foundation pit support structure and a construction method. BACKGROUND

[0002] Soft soil refers to soil with low strength, and soft soil is generally distributed near rivers, which means that the foundation pit support project will face the challenge of soft soil confined water layer. For such foundation pit support structures, the method of using cement soil water stop curtain and cement soil bottom sealing is generally used to improve the strength of the soil and prevent groundwater infiltration. Some use direct pumping to cut off groundwater seepage and cooperate with cement soil bottom sealing for foundation pit support design. Although the above two methods can solve the problem of soft soil confined water layer foundation pit support to some extent, they still have the following disadvantages: 1) high construction quality requirement, the foundation pit mainly relies on the cement soil water stop curtain for water stop, on the one hand, the strength of the mixed soil and soft soil increases slightly, on the other hand, uneven mixing is easy to occur, which can easily lead to foundation pit seepage; 2) high cost: using cement soil for water stop requires a large amount of cement, greatly increasing the cost of foundation pit support; 3) large environmental pollution: the use of a large amount of cement soil or the method of cutting off water sources will have a significant impact on the local underground environment and seriously pollute the local ecological environment. SUMMARY

[0003] The present application relates to the technical field of foundation pit support, in particular to a soft soil confined water layer modular foundation pit support structure and a construction method.

[0004] Technical scheme: The present application provides a soft soil confined water layer modular foundation pit support structure, which comprises a support assembly and a connecting assembly. The support assembly comprises a frozen pile, a first frozen pipe, a connecting pipe, a connecting rod and a supporting steel bar. The frozen pile is located at the bottom wall of the foundation pit. The first frozen pipe is fixed in the frozen pile. The connecting pipe is in communication with both ends of the first frozen pipe. A pre-buried hole is formed in the top of the frozen pile. The connecting rod is inserted into the pre-buried hole. The supporting steel bar is fixed to the top end of the connecting rod. The connecting assembly is arranged on the frozen pile and comprises a first connecting plate, a second connecting plate, a protection piece, a limiting piece and a fastener. The first connecting plate is fixed to the end of the first frozen pipe. The second connecting plate is fixed to the end of the connecting pipe. The protection piece is arranged on the first connecting plate. The limiting piece is arranged on both sides of the top of the frozen pile. The fastener is arranged on both sides of the connecting rod.

[0005] Further, the protection piece comprises a movable door and an inclined plate. Both sides of the top of the frozen pile are provided with a placing groove. The end of the first frozen pipe and the first connecting plate are located in the placing groove. The movable door is slid on both sides of the top of the inner wall of the placing groove. The inclined plate is fixed to both sides of the bottom of the movable door.

[0006] Further, the protection piece further comprises a movable block, a mounting block, a guide rod, a sliding block and a first spring, the movable block is slid on the top of the first connecting plate, the mounting block is fixed on the top of the first connecting plate and between the two movable blocks, the guide rod is fixed on the two sides of the mounting block, the sliding block is fixed on the two sides of the movable block and slides on the guide rod, and the first spring is fixed at both ends of the mounting block and the sliding block.

[0007] Further, the limiting piece comprises a protruding block, a limiting plate and a rotating plate, the protruding block is fixed on the top of the movable block, the limiting plate is fixed on the top of the frozen pile, and the rotating plate is rotatably connected between two limiting plates on each side.

[0008] Further, the limiting piece further comprises a blocking strip and a second spring, a sliding groove is formed in the inner side of the limiting plate, the blocking strip slides in the sliding groove, and the second spring is fixed at both ends of the blocking strip and the inner wall of the sliding groove.

[0009] Further, the fastening piece comprises a side support rod, a pressing plate, an insertion plate and a linkage rod, the side support rod is fixed on the top of the connecting rod, the top of the frozen pile is provided with an insertion hole matched with the side support rod, the pressing plate is fixed on the inner side of the side support rod, the inner side of the insertion hole is provided with a movable slot, the insertion plate slides in the movable slot, the connecting rod is provided with an insertion slot matched with the insertion plate on both sides, and the linkage rod is fixed on both sides of the insertion plate and the other end is fixed with the movable door.

[0010] Further, the following steps are taken:

[0011] (1) positioning and designing the foundation pit position, constructing the outer support pile around the foundation pit;

[0012] (2) erecting the column structure, installing the support steel bar and the connecting rod on the top of the frozen pile, and driving them into the bottom of the foundation pit;

[0013] (3) arranging the partial freezing pipe between every two adjacent frozen piles at the bottom of the foundation pit, and arranging the freezing pipe in the side support pile;

[0014] (4) starting the underground water circulation heat exchange device and the freezing unit;

[0015] (5) excavating the foundation pit and pouring the support at the same time;

[0016] (6) repeating the operation of excavating and pouring the support until the excavation of the foundation pit is completed.

[0017] Further, the surface of the support steel bar is provided with a receiving groove matched with the support.

[0018] Further, the side support pile is internally provided with a cable-stayed anchor rod.

[0019] Further, the cable-stayed anchor rod is hollow and is divided into a water inlet and a water outlet.

[0020] Beneficial effects: the construction method has large construction quality tolerance, low cost and small pollution, and the setting of the support assembly and the connecting assembly can greatly improve the convenience and stability of the support construction. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A scene diagram of the soft soil confined water layer modular foundation pit support structure and construction method.

[0022] Figure 2 A cable-stayed anchor rod sectional view of the soft soil confined water layer modular foundation pit support structure and construction method.

[0023] Figure 3 A freezing pile sectional view of the soft soil confined water layer modular foundation pit support structure and construction method.

[0024] Figure 4 A connecting assembly sectional view of the soft soil confined water layer modular foundation pit support structure and construction method.

[0025] Figure 5 Another perspective sectional view of the protection piece of the soft soil confined water layer modular foundation pit support structure and construction method.

[0026] Figure 6 Another perspective view of the limiting piece of the soft soil confined water layer modular foundation pit support structure and construction method.

[0027] Figure 7 A protection piece structure view of the soft soil confined water layer modular foundation pit support structure and construction method.

[0028] Figure 8 A fastener sectional view of the soft soil confined water layer modular foundation pit support structure and construction method.

[0029] Figure 9 A fastener top view sectional view of the soft soil confined water layer modular foundation pit support structure and construction method. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be further described in detail below in combination with the drawings.

[0031] Example 1

[0032] Reference Figure 1 and Figure 4For the first embodiment of the present application, the embodiment provides a soft soil confined water layer modular foundation pit support structure and a construction method, the soft soil confined water layer modular foundation pit support structure comprises a support assembly 100 and a connecting assembly, the support assembly 100 plays a supporting role on the foundation pit, and meanwhile the connecting assembly can improve the convenience and stability of support installation.

[0033] Specifically, the support assembly 100 comprises a frozen pile 101, a first freezing pipe 102, a connecting pipe 103, a connecting rod 104 and a support steel bar 105, the frozen pile 101 is located at the inner bottom wall of the foundation pit, the first freezing pipe 102 is fixed in the frozen pile 101, the connecting pipe 103 is in communication with both ends of the first freezing pipe 102, a pre-buried hole S is formed at the top of the frozen pile 101, the connecting rod 104 is inserted into the pre-buried hole S, and the support steel bar 105 is fixed at the top end of the connecting rod 104.

[0034] The frozen pile 101 is a prefabricated pile body, a part of the top of the frozen pile 101 can be provided as an iron or steel plate structure, the pre-buried hole S is located in the part, the first freezing pipe 102 is spirally embedded in the frozen pile 101, and the frozen pile 101 adopts high-thermal-conductivity concrete, when the frozen pile 101 is installed in the foundation pit, the first freezing pipe 102 is connected with external freezing equipment through the connecting pipe 103, so that the soft soil near the frozen pile 101 can be frozen to increase the hardness of the soft soil, when the soft soil is frozen, the soft soil can apply extrusion force to the frozen pile 101 from all directions, so that the stability of the support can be further improved, the connecting rod 104 and the support steel bar 105 are inserted into the pre-buried hole S, and can support the installed support in the subsequent construction process, a plurality of connecting rods 104 and support steel bars 105 are provided, and construction personnel can distribute them according to the actual situation of the foundation pit.

[0035] The connecting assembly is arranged on the frozen pile 101 and comprises a first connecting plate 201, a second connecting plate 202, a protection piece 203, a limiting piece 204 and a fastener 205, the first connecting plate 201 is fixed at the end of the first freezing pipe 102, the second connecting plate 202 is fixed at the end of the connecting pipe 103, the protection piece 203 is arranged on the first connecting plate 201, the limiting piece 204 is arranged on both sides of the top of the frozen pile 101, and the fastener 205 is arranged on both sides of the connecting rod 104.

[0036] The first connecting plate 201 and the second connecting plate 202 are both rectangular and used to communicate the first freezing pipe 102 and the connecting pipe 103, wherein the second connecting plate 202 is fixed with a pipe with a smaller hole diameter than the first freezing pipe 102 at the bottom, the outer side of the pipe is attached to the inner wall of the first freezing pipe 102, and the pipe can be entirely inserted into the first freezing pipe 102 during installation, so that the convenience of installation and the sealing effect after installation are improved, and leakage and other situations during freezing are avoided.

[0037] The protective piece 203 is used for protecting the two exposed ends of the first freezing pipe 102, avoiding foreign matters from entering the inside of the first freezing pipe 102 during the placing or transporting after the prefabrication, and affecting the subsequent use. The limiting piece 204 can limit and fix the second connecting plate 202 and the protective piece 203, so that the installation is more convenient and stable. The fastener 205 is used for fixing the connecting rod 104 and the supporting steel bar 105, and the stability is higher without welding operation.

[0038] Embodiment 2

[0039] With reference to Figures 1-9 For the second embodiment of the present application, the embodiment is based on the previous embodiment.

[0040] Specifically, the protective piece 203 includes a movable door 203a and an inclined plate 203b. The top of the freezing pile 101 is provided with a placing groove M on both sides. The end of the first freezing pipe 102 and the first connecting plate 201 are located in the placing groove M. The movable door 203a is slid on the top of the inner wall of the placing groove M on both sides. The inclined plate 203b is fixed on the bottom of the movable door 203a on both sides.

[0041] Two movable doors 203a are symmetrically arranged on each side and slid in the placing groove M. The first connecting plate 201 is located in the placing groove M. The inner wall of the placing groove M is fixed with a guide rail on both sides. The second connecting plate 202 is fixed with a sliding block on both sides. The sliding block is slid in the guide rail, so that the second connecting plate 202 and the connecting pipe 103 can be limited, avoiding the deviation during the downward installation. The bottom of the inclined plate 203b is inclined. Two inclined plates 203b are arranged on the bottom of each movable door 203a. When the connecting pipe 103 is installed, the second connecting plate 202 is placed on the top of the first connecting plate 201. Then, the two symmetrical movable doors 203a are closed. At this time, the second connecting plate 202 is pressed downward by the inclined plate 203b, so that it can be more stably attached to the first connecting plate 201, playing a sealing role. A hole is formed in the movable door 203a and attached to the connecting pipe 103. After the installation is completed, the hole can position the connecting pipe 103, avoiding the bending of the end.

[0042] The protective piece 203 further includes a movable block 203c, a mounting block 203d, a guide rod 203e, a sliding block 203f, and a first spring 203g. The movable block 203c is slid on the top of the first connecting plate 201 on both sides. The mounting block 203d is fixed on the top of the first connecting plate 201 and located between the two movable blocks 203c. The guide rod 203e is fixed on both sides of the mounting block 203d. The sliding block 203f is fixed on both sides of the movable block 203c and slid on the guide rod 203e. The first spring 203g is fixed at both ends of the mounting block 203d and the sliding block 203f.

[0043] Two movable blocks 203c slide on the top of each first connecting plate 201 and move towards each other, in the initial state, the two movable blocks 203c are in contact and close the end of the first freezing pipe 102 to avoid foreign matter entering the first freezing pipe 102 during transportation or storage, which brings great inconvenience to the subsequent operation, the mounting block 203d is located between the two movable blocks 203c, which together with the guide rod 203e and the sliding block 203f plays a guiding and limiting role, avoiding the deviation of the movable block 203c during movement, the first spring 203g applies an inward moving force to the sliding block 203f and the movable block 203c, so that the movable block 203c can be more stable in the initial state, and the protection effect is better.

[0044] The top of the movable block 203c is inclined, when the connecting pipe 103 and the second connecting plate 202 are installed on the top of the first connecting plate 201, the insertion pipe at the bottom of the second connecting plate 202 first pushes the two movable blocks 203c outward, and then is inserted into the first freezing pipe 102, the bottom of the second connecting plate 202 is provided with a slot for inserting the movable block 203c and other components, so as to prevent it from interfering with the installation of the second connecting plate 202.

[0045] The limiting piece 204 includes a protrusion 204a, a limiting plate 204b and a rotating plate 204c, the protrusion 204a is fixed on the top of the movable block 203c on both sides, the limiting plate 204b is fixed on the top of the freezing pile 101 on both sides, and the rotating plate 204c is rotatably connected between the two limiting plates 204b on each side.

[0046] The top of the protrusion 204a is chamfered, each side of the limiting plate 204b is provided with two, the rotating plate 204c is located between the two limiting plates 204b on each side and is rotatably connected with them through the rotating shaft, and the end of the rotating plate 204c is provided with a U-shaped cavity, when the two movable doors 203a are in contact, the rotating plate 204c is manually rotated, so that the protrusions 204a on the two movable doors 203a are located in the cavity, that is, the movable door 203a can be further fastened to prevent accidental separation and affect the stability of the installation of the connecting pipe 103.

[0047] The limiting piece 204 further includes a blocking strip 204d and a second spring 204e, the inner side of the limiting plate 204b is provided with a sliding groove P, the blocking strip 204d slides in the sliding groove P, and the second spring 204e is fixed at both ends of the blocking strip 204d and the inner wall of the sliding groove P.

[0048] The blocking strip 204d is rectangular, and both ends thereof slide in the sliding groove P. When the blocking strip 204d slides to a position close to the movable door 203a, the blocking strip 204d can limit the rotating plate 204c so that the rotating plate 204c cannot rotate. When the blocking strip 204d slides to a position close to one end of the rotating plate 204c, the rotating plate 204c can rotate freely. The second spring 204e applies a pulling force to the blocking strip 204d to make the blocking strip 204d close to the movable door 203a in the initial state, so that the blocking strip 204d can limit the rotating plate 204c, and the position of the movable door 203a is more stable.

[0049] The fastener 205 includes a side support rod 205a, a pressing plate 205b, an insertion plate 205c, and a linkage rod 205d. The side support rod 205a is fixed to the top of the connecting rod 104 on both sides. The top of the frozen pile 101 is provided with a insertion hole V, which cooperates with the side support rod 205a. The pressing plate 205b is fixed to the inner side of the side support rod 205a. The inner side of the insertion hole V is provided with a movable slot J. The insertion plate 205c slides in the movable slot J. Both sides of the connecting rod 104 are provided with an insertion slot Y, which cooperates with the insertion plate 205c. The linkage rod 205d is fixed to both sides of the insertion plate 205c, and the other end of the linkage rod 205d is fixed to the movable door 203a.

[0050] The side support rod 205a is L-shaped, and one end thereof is detachably fixed to both sides of the connecting rod 104, which is not shown in the figure. The other end of the side support rod 205a is inserted into the insertion hole V during installation. The pressing plate 205b is rectangular, and the bottom thereof is chamfered. The top of the insertion plate 205c is also chamfered, and the insertion plate 205c can move in the movable slot J. During installation, the side support rod 205a and the pressing plate 205b move towards the insertion hole V, and the pressing plate 205b pushes the insertion plate 205c to move towards the connecting rod 104. The insertion slot Y is divided into two parts. One part is shallow, and the other part is deep. After installation is completed, the insertion plate 205c is located in the deep part of the insertion slot Y, thereby limiting and fixing the connecting rod 104, so as to improve the stability of the connecting rod 104 after installation.

[0051] The linkage rod 205d is used to connect the insertion plate 205c and the movable door 203a. When the insertion plate 205c is inserted into the insertion slot Y, the insertion plate 205c and the linkage rod 205d drive the movable door 203a to move synchronously, so that the movable door 203a is closed, thereby further improving the stability of the movable door 203a after being closed.

[0052] In use, first, the frozen pile 101 is prefabricated externally. In the process of pouring, the first freezing pipe 102 is spirally pre-buried in the frozen pile 101. After prefabrication, the two exposed ends of the first freezing pipe 102 can be protected by the movable blocks 203c and the movable door 203a on both sides, so as to avoid dust and other impurities from entering the first freezing pipe 102 during transportation or storage, thereby bringing great inconvenience to subsequent use. Then, the support steel bars 105 and the connecting pipes 103 are installed on the frozen pile 101 externally.

[0053] First open the movable door 203a, insert the connecting pipe 103 and the second connecting plate 202 on the first connecting plate 201, at this time, the insertion pipe at the bottom of the second connecting plate 202 first pushes the two movable blocks 203c outward, and then is inserted into the first freezing pipe 102, until the second connecting plate 202 is attached to the first connecting plate 201, then the supporting steel bar 105 and the connecting rod 104 are inserted into the pre-buried hole S, the side support rod 205a and the pressing plate 205b are moved into the insertion hole V, and the insertion plate 205c is pushed by the pressing plate 205b to move in the direction of the connecting rod 104, at this time, the insertion plate 205c is located in the deeper position in the insertion slot Y, thereby limiting and fixing the connecting rod 104, to improve the stability of the connecting rod 104 after installation, at the same time, the insertion plate 205c and the linkage rod 205d drive the movable door 203a to move synchronously, so as to close the movable door 203a, thereby further improving the stability of the movable door 203a after closing, finally, manually rotating the rotating plate 204c, so that the protrusions 204a on the two movable doors 203a are located in the cavity, that is, the movable door 203a can be further fastened to prevent accidental disengagement and affect the stability of the installation of the connecting pipe 103, at this time, the installation of the pile body can be completed, facilitating subsequent construction.

[0054] The freezing pile 101 and the first freezing pipe 102 in the device are prefabricated piles, the internal structure of which is disposable and does not need to be reused, while the connecting pipe 103 and the connecting rod 104 and other structures are reusable, thereby achieving the effect of reducing cost to a certain extent.

[0055] Embodiment 3

[0056] Reference Figures 1-9 This is the third embodiment of the present application, which is based on the first two embodiments.

[0057] Specifically, the method further comprises the following steps:

[0058] The position of the foundation pit is located and designed, the outer side support pile 301 is constructed around the foundation pit, the inside is filled with high thermal conductivity material, the outer side is inclined and pulled by the inclined anchor rod 304 to improve the overall tensile strength, wherein the inclined anchor rod 304 is hollow and divided into the water inlet H1 and the water outlet H2, the two form a water circulation and also play a freezing role, further improving the strength of the overall foundation pit.

[0059] The column structure construction is to install the support steel bars 105 and the connecting rods 104 on the top of the frozen piles 101 and to drive them into the bottom of the foundation pit, which is provided with multiple groups, which are arranged according to the distribution of the subsequent required supports 303, wherein the surface of the support steel bars 105 is provided with multiple layers of receiving grooves T, and each layer of the supports 303 is located in the receiving groove T during pouring, so as to improve the bearing capacity of the supports 303, and the receiving grooves T are provided with detachable formworks, which are not shown in the figure, so as to facilitate the subsequent removal of the supports 303;

[0060] The partial freezing pipes 302 are arranged at the bottom of the foundation pit and between each two adjacent frozen piles 101, and the freezing pipes are also arranged in the side support piles 301, and the multiple partial freezing pipes 302 can further improve the hardness of the soft soil at the bottom of the foundation pit, so as to provide convenience for construction, and the freezing pipes in the side support piles 301 are used to improve the strength of the soft soil around the foundation pit;

[0061] The underground water circulation heat exchange device is started, and the freezing unit is started, which is a device in the prior art, and the working principle thereof is known to those skilled in the art and will not be described here;

[0062] The foundation pit is excavated, and the pouring of the supports 303 is carried out at the same time;

[0063] The operation of excavating and pouring the supports 303 is repeated until the excavation of the foundation pit is completed, and in this step, the supports 303 need to be poured after the foundation pit is excavated to a certain depth, and then the excavation is continued, so as to ensure that the support of the foundation pit is always stable.

Claims

1. A modular foundation pit support structure for soft soil confined water layers, characterized by: Comprising, The supporting assembly (100) comprises a frozen pile (101), a first frozen pipe (102), a connecting pipe (103), a connecting rod (104) and a supporting steel bar (105), the frozen pile (101) is located in the bottom wall of the foundation pit, the first frozen pipe (102) is fixed in the frozen pile (101), the connecting pipe (103) is communicated with both ends of the first frozen pipe (102), the top of the frozen pile (101) is provided with a pre-buried hole (S), the connecting rod (104) is inserted into the pre-buried hole (S), and the supporting steel bar (105) is fixed at the top end of the connecting rod (104); and The connecting assembly is arranged on the frozen pile (101) and comprises a first connecting plate (201), a second connecting plate (202), a protection piece (203), a limiting piece (204) and a fastener (205), the first connecting plate (201) is fixed at the end of the first frozen pipe (102), the second connecting plate (202) is fixed at the end of the connecting pipe (103), the protection piece (203) is arranged on the first connecting plate (201), the limiting piece (204) is arranged on both sides of the top of the frozen pile (101), and the fastener (205) is arranged on both sides of the connecting rod (104); The protection piece (203) comprises a movable door (203a) and an inclined plate (203b), and further comprises a movable block (203c), a mounting block (203d), a guide rod (203e), a sliding block (203f) and a first spring (203g); The limiting piece (204) comprises a protruding block (204a), a limiting plate (204b) and a rotating plate (204c), the protruding block (204a) is fixed on both sides of the top of the movable block (203c), the limiting plate (204b) is fixed on both sides of the top of the frozen pile (101), and the rotating plate (204c) is rotatably connected between two limiting plates (204b) on each side; The limiting piece (204) further comprises a blocking strip (204d) and a second spring (204e), an inner side of the limiting plate (204b) is provided with a sliding groove (P), the blocking strip (204d) slides in the sliding groove (P), and the second spring (204e) is fixed at both ends of the blocking strip (204d) and the inner wall of the sliding groove (P), respectively. The fastener (205) comprises a side support rod (205a), a pressing plate (205b), an insertion plate (205c) and a linkage rod (205d), the side support rod (205a) is fixed on both sides of the top of the connecting rod (104), the top of the frozen pile (101) is provided with an insertion hole (V) matched with the side support rod (205a), the pressing plate (205b) is fixed on the inner side of the side support rod (205a), the inner side of the insertion hole (V) is provided with a movable slot (J), the insertion plate (205c) slides in the movable slot (J), both sides of the connecting rod (104) are provided with an insertion slot (Y) matched with the insertion plate (205c), the linkage rod (205d) is fixed on both sides of the insertion plate (205c) and the other end is fixed with the movable door (203a).

2. The soft soil confined water layer modular foundation pit support structure according to claim 1, characterized in that: Both sides of the top of the frozen pile (101) are provided with a placing groove (M), the end of the first frozen pipe (102) and the first connecting plate (201) are located in the placing groove (M), the movable door (203a) slides on both sides of the top of the inner wall of the placing groove (M), and the inclined plate (203b) is fixed on both sides of the bottom of the movable door (203a).

3. The soft soil confined water layer modular foundation pit support structure according to claim 2, characterized in that: The movable block (203c) slides on both sides of the top of the first connecting plate (201), the mounting block (203d) is fixed on the top of the first connecting plate (201) and located between the two movable blocks (203c), the guide rod (203e) is fixed on both sides of the mounting block (203d), the sliding block (203f) is fixed on both sides of the movable block (203c) and slides on the guide rod (203e), and the first spring (203g) is fixed at both ends of the mounting block (203d) and the sliding block (203f).

4. A construction method of a soft soil confined water layer modular foundation pit support structure, characterized by: The foundation pit supporting structure comprises the foundation pit supporting structure according to any one of claims 1-3 and further comprises the following steps: (1) positioning and designing the position of the foundation pit, and constructing the outer supporting pile (301) around the foundation pit; (2) constructing the column structure, installing the supporting steel bars (105) and the connecting rods (104) on the top of the frozen piles (101), and driving the two into the bottom of the foundation pit; (3) arranging the partial frozen pipes (302) on the bottom of the foundation pit and between every two adjacent frozen piles (101), and arranging the frozen pipes in the side supporting piles (301) as well; (4) starting the underground water circulation heat exchange device and the freezing unit; (5) excavating the foundation pit and pouring the support (303) at the same time; (6) repeating the operations of excavating and pouring the support (303) until the excavation of the foundation pit is completed.

5. The construction method of claim 4, wherein: The surface of the supporting steel bar (105) is provided with a receiving groove (T) matched with the support (303).

6. The construction method of claim 5, wherein: The inner side of the side supporting pile (301) is provided with a cable-stayed anchor rod (304).

7. The construction method of claim 6, wherein: The cable-stayed anchor rod (304) is hollow and comprises a water inlet (H1) and a water outlet (H2).

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