Prefabricated underground diaphragm wall with pre-buried freezing pipes and construction method of prefabricated underground diaphragm wall

Abstract

The invention provides a prefabricated underground diaphragm wall with pre-embedded freezing pipes and a construction method thereof, the prefabricated underground diaphragm wall is formed by splicing a plurality of groups of underground diaphragm wall single bodies internally provided with the pre-embedded freezing pipes, and the underground diaphragm wall single bodies are provided with weight reduction hollow holes; a first reserved pouring groove and a first connecting groove are formed in the bottom of the upper-layer underground diaphragm wall single body, a second reserved pouring groove and a second connecting groove are formed in the top of the lower-layer underground diaphragm wall single body, the first connecting groove is communicated with the weight reduction hollowed-out hole and the first reserved pouring groove, and the second connecting groove is communicated with the weight reduction hollowed-out hole and the second reserved pouring groove; every two groups of diaphragm wall single bodies adjacent left and right are fixedly connected through the bayonet columns and the bayonet grooves. The method can be applied to the underground diaphragm wall of the deep foundation pit, the construction time of the underground diaphragm wall can be shortened, the integrity of the prefabricated underground diaphragm wall is improved, fixed-point freezing water stopping can be achieved, the water stopping time is shortened, the freezing water stopping cost is reduced, and the construction safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground continuous wall construction, and in particular relates to a prefabricated underground continuous wall with pre-buried freezing pipes and a construction method thereof. Background Art

[0002] As a form of enclosure, underground continuous wall is currently widely used in foundation pit enclosure for underground space development in major cities. It has been used for a long time, so the technology is very mature. Nowadays, prefabrication and assembly is one of the hot topics in the field of civil engineering. There are also related studies to adjust conventional cast-in-place ground-connected walls to prefabricated ground-connected walls to solve the problems of irregular water seepage and difficult control of flatness on the surface of cast-in-place ground-connected walls. However, as the development of urban underground space becomes deeper and deeper, the underground continuous walls are also getting longer and longer, which brings great inconvenience to the transportation and hoisting of prefabricated ground-connected walls, and restricts the development of prefabricated ground-connected walls to a certain extent. If the prefabricated ground-connected wall is vertically spliced ​​by multiple ground-connected walls, the weight and length of a single ground-connected wall can be effectively reduced, which is convenient for construction. However, large internal forces will be transmitted between multiple ground-connected walls and waterproof treatment needs to be carried out separately, and the integrity between the ground-connected walls is poor, and the splicing is difficult to handle. Therefore, the present invention provides a prefabricated ground-connected wall with embedded freezing pipes and a construction method thereof to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a prefabricated ground-connected wall with embedded freezing pipes and a construction method thereof, which can be applied to ground-connected walls in deep foundation pits. The integrity of the ground-connected wall is improved by the special design of the joints and grouting into the gaps, while simplifying the water-stopping treatment and shortening the construction time. It can also freeze at a fixed point when leakage occurs at the joints and stop water in a short time, thus solving the problems of low strength at the joints of the spliced ​​prefabricated ground-connected walls, high possibility of leakage and poor integrity.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] (1) The present invention provides a prefabricated ground-connected wall with embedded freezing pipes, wherein the prefabricated ground-connected wall is formed by splicing a plurality of groups of ground-connected wall monomers, wherein two groups of ground-connected wall monomers adjacent to each other vertically are fixedly connected, and two groups of ground-connected wall monomers adjacent to each other horizontally are fixedly connected; embedded freezing pipes are arranged inside the ground-connected wall monomers, wherein the embedded freezing pipes are used to introduce a refrigerant medium, and the refrigerant medium inlet and the refrigerant medium outlet of the embedded freezing pipes are both connected to the outside.

[0006] Furthermore, the ground-connected wall monomer is provided with at least one weight-reducing hollow hole penetrating from top to bottom, and the positions of the weight-reducing hollow holes of two adjacent groups of ground-connected wall monomers are corresponding.

[0007] Furthermore, in the two adjacent groups of ground-connected wall monomers, the bottom surfaces of the ground-connected wall monomers distributed in the upper layer are provided with a first reserved casting groove and a first connecting groove, and the top surfaces of the ground-connected wall monomers distributed in the lower layer are provided with a second reserved casting groove and a second connecting groove; the first reserved casting groove and the second reserved casting groove are relative to each other in vertical positions, and the first connecting groove and the second connecting groove are relative to each other in vertical positions; when the two adjacent groups of ground-connected wall monomers are aligned, the first reserved casting groove and the second reserved casting are interconnected, and the first connecting groove and the second connecting groove are interconnected; the first connecting groove is respectively connected to the weight-reducing hollow hole and the first reserved casting groove, and the second connecting groove is respectively connected to the weight-reducing hollow hole and the second reserved casting groove.

[0008] Furthermore, the first reserved casting groove and the second reserved casting groove are both distributed along the horizontal direction, and two first reserved casting grooves and the second reserved casting grooves are respectively provided, and the two first reserved casting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the two second reserved casting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole; the first connecting groove and the second connecting groove are both perpendicular to the first reserved casting groove / the second reserved casting groove, and two first connecting grooves and the second connecting grooves are respectively provided; the two first connecting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the two ends of the first connecting groove are respectively connected to the first reserved casting groove and the weight-reducing hollow hole; the two second connecting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the second connecting grooves are respectively connected to the second reserved casting groove and the weight-reducing hollow hole.

[0009] Furthermore, exposed steel bars are respectively arranged in the first reserved casting groove and the second reserved casting groove, and the exposed steel bars in the first reserved casting groove and the second reserved casting groove are staggered up and down.

[0010] Furthermore, the two adjacent groups of ground-connected wall monomers on the left and right are fixedly connected by bayonet columns; the left and right ends of the ground-connected wall monomers are respectively provided with bayonet grooves of the same shape, the bayonet grooves pass through from top to bottom, and the positions of the bayonet grooves of the two adjacent groups of ground-connected wall monomers on the upper and lower sides correspond; the bayonet columns can be inserted into the bayonet grooves of the two adjacent groups of ground-connected wall monomers on the left and right at the same time, and be fixed with the two bayonet grooves.

[0011] Furthermore, the cross-section of the bayonet column is an axisymmetric figure, the bayonet grooves of the two adjacent groups of ground-connected wall units are relative to each other, and the space formed by the two bayonet grooves is compatible with the shape and specifications of the bayonet column; the outer surface of the bayonet column is covered with a waterproof rubber strip.

[0012] Furthermore, a protruding portion is provided at the bottom center of the ground-connected wall monomer distributed in the upper layer, upper horizontal sections are symmetrically provided on both sides of the protruding portion, and upper slope sections are symmetrically provided on the outer sides of the two horizontal sections; a recessed portion is provided at the top center of the ground-connected wall monomer distributed in the lower layer, lower horizontal sections are symmetrically provided on both sides of the recessed portion, and lower slope sections are symmetrically provided on the outer sides of the two horizontal sections; the protruding portion and the recessed portion fit together and are distributed along the extension direction of the ground-connected wall, and the outer surfaces of the protruding portion and the recessed portion are respectively covered with water-stop rubber; when the upper and lower adjacent groups of ground-connected wall monomers are aligned, the protruding portion is tightly embedded in the recessed portion, the upper horizontal section fits tightly with the lower horizontal section, and the upper slope section fits tightly with the lower slope section.

[0013] Furthermore, a number of steel cages that is the same as the number of ground-connected wall units is provided; the embedded freezing pipes are fixed in the steel cages, and the steel cages carrying the embedded freezing pipes are arranged inside the ground-connected wall units.

[0014] (II) The present invention also provides a construction method of a prefabricated ground-connected wall, comprising the following steps:

[0015] S1. Hoist the first ground-connected wall unit into the groove of the ground-connected wall, hoist the bayonet column into the bayonet groove on one side of the ground-connected wall unit, and the height of the bayonet column is greater than the height of the ground-connected wall unit; hoist the second ground-connected wall unit from top to bottom along the bayonet column to the top of the first ground-connected wall unit, and then embed another bayonet column into the bayonet groove on one side of the second ground-connected wall unit, and repeat the above operation until the first row of vertical ground-connected walls are spliced;

[0016] S2. After the first row of vertical ground-connected walls are spliced, another ground-connected wall unit is hoisted from top to bottom along the other side of the bayonet column of the first row of vertical ground-connected walls to the bottom of the groove of the ground-connected wall. Then, the second row of vertical ground-connected walls are spliced ​​according to the above operation, and the bayonet column is hoisted and embedded in the bayonet groove on the other side of the second row of vertical ground-connected walls.

[0017] S3, repeat the operation of step S2 to complete the splicing of all ground-connected wall units;

[0018] S4. Pour concrete into the weight-reducing hollow holes of the ground-connected wall unit. The concrete flows into the first connecting groove and the second connecting groove through the weight-reducing hollow holes, and then into the first reserved casting groove and the second reserved casting groove. After the concrete solidifies, the construction of the prefabricated ground-connected wall is completed.

[0019] Beneficial Effects

[0020] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0021] (1) The present invention provides a prefabricated ground-connected wall and a supporting construction method for deep foundation pits, which solves the problem that traditional prefabricated ground-connected walls cannot be used in deep foundation pits;

[0022] (2) The present invention pre-buries the freezing pipe in the prefabricated ground-connected wall, thereby solving the problem of water seepage in the joints that may exist in the later stage of the prefabricated ground-connected wall, achieving short-term, efficient and low-cost treatment of leakage problems, and realizing fixed-point freezing, which can greatly reduce the freezing time and the cost of using liquid nitrogen;

[0023] (3) The present invention innovatively designs a joint for connecting the upper and lower ground walls, which improves the bending strength of the transverse joints and avoids leakage problems from a structural perspective;

[0024] (4) The ground-connected wall of the present invention is designed with special-shaped bayonet grooves on both sides, and is connected by matching columns. After the ground-connected wall is connected, concrete is poured into the hollow holes that reduce the deadweight of the ground-connected wall. Because the reserved casting grooves are connected to the holes, the concrete flows into the internal grooves and solidifies, and the integrity is greatly enhanced, while the possibility of leakage is greatly reduced.

[0025] (5) The present invention can reduce the construction time of the guide wall. The ground-anchored wall splicing and the ground-anchored wall groove excavation can be carried out simultaneously, which can also greatly save construction time. In addition, the strength and integrity of the ground-anchored wall constructed by this method are basically the same as the strength of the cast-in-place ground-anchored wall of the traditional deep foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A top view of the prefabricated ground-connected wall of the present invention;

[0027] Figure 2 This is a cross-sectional view of the prefabricated ground-wall joint of the present invention;

[0028] Figure 3 It is a plan view of a steel cage for pre-embedded freezing pipes in a prefabricated ground-connected wall of the present invention;

[0029] Figure 4 for Figure 2 Sectional view at point A in the middle;

[0030] Figure 5 for Figure 2 Sectional view at point B;

[0031] Figure 6 A cross-sectional diagram of the prefabricated ground-connected wall of the present invention;

[0032] Figure 7 This is a schematic diagram of the prefabricated ground-connected wall bayonet column of the present invention;

[0033] Figure 8 This is a structural diagram of the prefabricated ground-connected wall with embedded freezing pipes according to the present invention;

[0034] The markings in the accompanying drawings are:

[0035] 1. Ground-connected wall unit; 2. Embedded freezing pipe; 3. Refrigeration medium inlet; 4. Refrigeration medium outlet; 5. Bayonet column; 6. Bayonet groove; 7. Weight-reducing hollow hole; 8. First reserved casting groove; 9. First connecting groove; 10. Second reserved casting groove; 11. Second connecting groove; 12. Exposed steel bars; 13. Protrusion; 14. Upper slope section; 15. Recessed section; 16. Lower slope section; 17. Water-stop rubber; 18. Steel cage; 19. Upper ground-connected wall; 20. Middle ground-connected wall; 21. Bottom ground-connected wall. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Reference Figures 1-2 The embodiment of the present invention provides a prefabricated ground-connected wall with a pre-buried freezing pipe 2, wherein the prefabricated ground-connected wall is formed by splicing a plurality of ground-connected wall units 1. The prefabricated ground-connected wall is a three-layer structure, including an upper ground-connected wall 19, a middle ground-connected wall 20, and a bottom ground-connected wall 21. Among the plurality of ground-connected wall units 1, two adjacent ground-connected wall units 1 are fixedly connected, and two adjacent ground-connected wall units 1 are fixedly connected.

[0038] like Figure 3 As shown, each ground-connected wall unit 1 is provided with a steel cage 18 and a pre-buried freezing pipe 2. The pre-buried freezing pipe 2 is fixed in the steel cage 18, and the steel cage 18 carrying the pre-buried freezing pipe 2 is pre-buried in the ground-connected wall unit 1. Among them, the pre-buried freezing pipe 2 is used to introduce a refrigerant (liquid nitrogen). The refrigerant medium inlet 3 and the refrigerant medium outlet 4 of the pre-buried freezing pipe 2 are both connected to the outside, and the refrigerant medium inlet 3 and the refrigerant medium outlet 4 of the pre-buried freezing pipe 2 are respectively provided with a cover. When leakage occurs, the liquid nitrogen flows into the freezing pipe through the inlet of the freezing pipe, is vaporized, and then enters the atmosphere from the outlet of the freezing pipe. The pre-buried freezing pipe 2 can be set as a rectangular double-ring structure (such as Figure 8 As shown in the figure, it can take care of every joint on the upper, lower, left and right sides of the ground-connected wall, extend the flow path of liquid nitrogen, realize the full utilization of liquid nitrogen cooling capacity in the freezing pipe, and improve the freezing effect.

[0039] In addition, the ground-connected wall is molded in the factory, and a special steel cage 18 and freezing pipes are placed in the mold during production. The freezing pipes not only play the role of freezing and stopping water leakage in the later stage, but also replace part of the steel bars to enhance the tensile performance of the prefabricated ground-connected wall.

[0040] like Figures 1-2 As shown, the ground-connected wall unit 1 is provided with three weight-reducing hollow holes 7 that penetrate vertically, and the weight-reducing hollow holes 7 of two adjacent groups of ground-connected wall units 1 correspond to each other, that is, the weight-reducing hollow holes 7 penetrate vertically in the overall ground-connected wall. The weight-reducing hollow holes 7 are used for pouring concrete to improve the integrity of the ground-connected wall. The steel cage 18 and the embedded freezing pipe 2 are partially distributed in the weight-reducing hollow holes 7.

[0041] In a preferred embodiment of the present invention, Figure 2 and Figures 4 to 6 As shown, the bottom surface of the ground-connected wall monomers 1 distributed in the upper layer is provided with a first reserved casting groove 8 and a first connecting groove 9, and the top surface of the ground-connected wall monomers 1 distributed in the lower layer is provided with a second reserved casting groove 10 and a second connecting groove 11. The first reserved casting groove 8 and the second reserved casting groove 10 are opposite to each other in vertical positions, and the first connecting groove 9 and the second connecting groove 11 are opposite to each other in vertical positions. When the two adjacent groups of ground-connected wall monomers 1 are aligned, the first reserved casting groove 8 is interconnected with the second reserved casting groove, and the first connecting groove 9 is interconnected with the second connecting groove 11. The first connecting groove 9 is respectively connected to the weight-reducing hollow hole 7 and the first reserved casting groove 8, and the second connecting groove 11 is respectively connected to the weight-reducing hollow hole 7 and the second reserved casting groove 10.

[0042] In a preferred embodiment of the present invention, Figure 2 As shown, the first reserved casting groove 8 and the second reserved casting groove 10 are both distributed in the horizontal direction, two first reserved casting grooves 8 and two second reserved casting grooves 10 are respectively provided, the two first reserved casting grooves 8 are symmetrically distributed on both sides of the weight-reducing hollow hole 7, and the two second reserved casting grooves 10 are symmetrically distributed on both sides of the weight-reducing hollow hole 7. The first connecting groove 9 and the second connecting groove 11 are both perpendicular to the first reserved casting groove 8 / the second reserved casting groove 10, two first connecting grooves 9 and two second connecting grooves 11 are respectively provided, the two first connecting grooves 9 are symmetrically distributed on both sides of the weight-reducing hollow hole 7, and the two ends of the first connecting groove 9 are respectively connected with the first reserved casting groove 8 and the weight-reducing hollow hole 7, the two second connecting grooves 11 are symmetrically distributed on both sides of the weight-reducing hollow hole 7, and the second connecting grooves 11 are respectively connected with the second reserved casting groove 10 and the weight-reducing hollow hole 7.

[0043] like Figures 4 to 6 As shown, the first reserved casting groove 8 and the second reserved casting groove 10 are respectively provided with exposed steel bars 12, and the exposed steel bars 12 of the first reserved casting groove 8 and the second reserved casting groove 10 are staggered up and down. The purpose of providing the exposed steel bars 12 is to improve the integrity of the spliced ​​ground-connected wall.

[0044] like Figures 1-2 and Figure 7 As shown, the two adjacent groups of ground-connected wall monomers 1 are fixedly connected by bayonet columns 5; the left and right ends of the ground-connected wall monomers 1 are respectively provided with bayonet grooves 6 of the same shape, which are passed through from top to bottom, and the bayonet grooves 6 of the two adjacent groups of ground-connected wall monomers 1 correspond in position, that is, the bayonet grooves 6 run through the entire ground-connected wall. The bayonet columns 5 can be simultaneously inserted into the bayonet grooves 6 of the two adjacent groups of ground-connected wall monomers 1, and are fixedly connected with the two bayonet grooves 6.

[0045] like Figure 7 As shown, the cross section of the bayonet column 5 is an axisymmetric figure, the bayonet slots 6 of the two adjacent groups of ground-connected wall units 1 are opposite to each other, and the space formed by the two bayonet slots 6 is adapted to the shape and specification of the bayonet column 5. The outer surface of the bayonet column 5 is covered with a waterproof rubber strip to reduce the risk of water seepage.

[0046] In a preferred embodiment of the present invention, Figure 7 As shown, the cross section of the bayonet column 5 can be set as a multi-fold axisymmetric figure, which can achieve the connection between the ground-connected wall monomers 1 while extending the water seepage path, thereby reducing the possibility of leakage from a structural perspective. In addition, this design uses a larger bayonet column 5 to connect and fix the stress concentration part, which can achieve the effect of enhancing the ground-connected wall to resist lateral soil pressure, and solves the problem of low lateral pressure resistance and poor integrity of the horizontal splicing of the ground-connected wall.

[0047] In addition, in order to avoid fracture caused by stress concentration, several bayonet columns 5 with different heights are designed during the construction design stage, and then prefabricated by the prefabrication yard before starting construction.

[0048] like Figures 4 to 6 As shown, the bottom center of the ground-connected wall monomer 1 distributed in the upper layer is provided with an arc-shaped protrusion 13, upper horizontal sections are symmetrically arranged on both sides of the protrusion 13, upper slope sections 14 are symmetrically arranged outside the two horizontal sections, and the first reserved casting groove 8 is arranged at the upper horizontal section. The top center of the ground-connected wall monomer 1 distributed in the lower layer is provided with an arc-shaped recessed portion 15, lower horizontal sections are symmetrically arranged on both sides of the recessed portion 15, lower slope sections 16 are symmetrically arranged outside the two horizontal sections, and the second reserved casting groove 10 is arranged at the lower horizontal section. The protrusion 13 and the recessed portion 15 fit each other and are distributed along the extension direction of the ground-connected wall, and the outer surfaces of the protrusion 13 and the recessed portion 15 are respectively covered with waterproof rubber 17 to reduce the risk of water seepage. When the upper and lower adjacent groups of ground-connected wall monomers 1 are aligned, the protrusion 13 is tightly embedded in the recessed portion 15, the upper horizontal section is tightly fitted with the lower horizontal section, and the upper slope section 14 is tightly fitted with the lower slope section 16.

[0049] The construction method of the above-mentioned prefabricated ground-connected wall comprises the following steps:

[0050] Step 1: According to the requirements of the construction drawings, dig a ground-anchored wall groove at the designed position of the ground-anchored wall for placing the first row of ground-anchored walls, and inject mud into it to prevent soil collapse on both sides.

[0051] Step 2: After the excavation of the ground-connected wall groove of the first row of ground-connected walls is completed, the first ground-connected wall unit 1 is hoisted and placed at the bottom of the ground-connected wall groove, and the bayonet column 5 wrapped with the water-stop rubber strip is hoisted and embedded in the bayonet groove 6 on one side of the ground-connected wall unit 1. The height of this bayonet column 5 is greater than the height of the ground-connected wall unit 1, which is convenient for positioning the second ground-connected wall; then, the second ground-connected wall unit 1 is hoisted from top to bottom along the bayonet column 5 to the top of the first ground-connected wall unit 1, and then another bayonet column 5 is embedded in the bayonet groove 6 on one side of the second ground-connected wall unit 1, and the above operation is repeated until the first row of vertical ground-connected walls are spliced;

[0052] Step 3: After the first row of vertical ground-connected walls are spliced, the second row of vertical ground-connected walls are spliced, and the ground-connected walls are spliced ​​and the ground-connected wall grooves are excavated simultaneously. The ground-connected wall monomer 1 of the second row of vertical ground-connected walls is hoisted from top to bottom along the other side of the first row of vertical ground-connected wall bayonet column 5 to the bottom of the ground-connected wall groove, and then the second row of vertical ground-connected walls are spliced ​​according to the above operation, and the bayonet column 5 wrapped with the water-stopping rubber strip is hoisted and embedded in the bayonet groove 6 on the other side of the second row of vertical ground-connected walls.

[0053] Step 4: Repeat the operation of step 3 to complete the splicing of all ground-connected wall units 1;

[0054] Step 5: pouring highly fluid concrete in the weight-reducing hollow holes 7 of the ground-connected wall unit 1. When pouring the concrete from bottom to top, when pouring to the joint, the concrete flows into the first connecting groove 9 and the second connecting groove 11 through the weight-reducing hollow holes 7, and enters the first reserved pouring groove 8 and the second reserved pouring groove 10, and pours until it is flush with the ground surface, completing the pouring. After the concrete solidifies, the construction of the prefabricated ground-connected wall is completed.

[0055] During the later construction, when leakage is found at a joint of the ground-connected wall, liquid nitrogen is introduced into the inlet of the pre-buried freezing pipe 2 of the ground-connected wall unit 1 around the joint, which can freeze and stop the leakage in a short time and avoid the safety hazards caused by seepage.

[0056] The present invention provides a prefabricated ground-connected wall with pre-buried freezing pipes and a construction method thereof, which can shorten the construction time of the ground-connected wall and can be applied to the ground-connected wall of a deep foundation pit, and solves the problems of low strength at joints of the spliced ​​prefabricated ground-connected wall, high possibility of leakage, and poor integrity, and freezing pipes are reserved for leakage that may occur at the joints of the prefabricated ground-connected wall. When leakage occurs around a small ground-connected wall in the entire ground-connected wall, water can be stopped by fixed-point freezing, thereby shortening the water-stopping time. Compared with traditional liquid nitrogen freezing, the freezing and water-stopping cost is reduced, and the safety of construction is improved.

[0057] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A prefabricated ground-connected wall with pre-buried freezing pipes, characterized in that: The prefabricated ground-connected wall is formed by splicing together a number of ground-connected wall units. Among the plurality of groups of ground-connected wall monomers, two groups of ground-connected wall monomers adjacent to each other vertically are fixedly connected, and two groups of ground-connected wall monomers adjacent to each other horizontally are fixedly connected; A pre-buried freezing pipe is arranged inside the ground-connected wall monomer, and the pre-buried freezing pipe is used to introduce a refrigeration medium. The refrigeration medium inlet and the refrigeration medium outlet of the pre-buried freezing pipe are both connected to the outside.

2. The prefabricated ground-connected wall with embedded freezing pipes according to claim 1, characterized in that: The ground-connected wall monomer is provided with at least one weight-reducing hollow hole penetrating vertically, and the weight-reducing hollow holes of two adjacent groups of ground-connected wall monomers are located in corresponding positions.

3. The prefabricated ground-connected wall with embedded freezing pipes according to claim 2, characterized in that: In the two adjacent groups of ground-connected wall units, the bottom surfaces of the ground-connected wall units distributed in the upper layer are provided with first reserved casting grooves and first connecting grooves, and the top surfaces of the ground-connected wall units distributed in the lower layer are provided with second reserved casting grooves and second connecting grooves; The first reserved casting groove and the second reserved casting groove are opposite to each other in vertical position, and the first connecting groove and the second connecting groove are opposite to each other in vertical position; when the upper and lower adjacent groups of ground-connected wall monomers are aligned, the first reserved casting groove and the second reserved casting groove are connected to each other, and the first connecting groove and the second connecting groove are connected to each other; The first connecting groove is communicated with the weight-reducing hollow hole and the first reserved casting groove respectively, and the second connecting groove is communicated with the weight-reducing hollow hole and the second reserved casting groove respectively.

4. The prefabricated ground-connected wall with embedded freezing pipes according to claim 3, characterized in that: The first reserved casting groove and the second reserved casting groove are both distributed along the horizontal direction, two first reserved casting grooves and two second reserved casting grooves are respectively provided, the two first reserved casting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the two second reserved casting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole; The first connecting groove and the second connecting groove are both perpendicular to the first reserved casting groove / the second reserved casting groove, and two first connecting grooves and two second connecting grooves are respectively provided; the two first connecting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the two ends of the first connecting groove are respectively connected to the first reserved casting groove and the weight-reducing hollow hole; the two second connecting grooves are symmetrically distributed on both sides of the weight-reducing hollow hole, and the second connecting grooves are respectively connected to the second reserved casting groove and the weight-reducing hollow hole.

5. The prefabricated ground-connected wall with embedded freezing pipes according to claim 3, characterized in that: Exposed steel bars are respectively arranged in the first reserved casting groove and the second reserved casting groove, and the exposed steel bars in the first reserved casting groove and the second reserved casting groove are staggered up and down.

6. The prefabricated ground-connected wall with embedded freezing pipes according to claim 3, characterized in that: The two adjacent groups of ground-connected wall units on the left and right are fixedly connected by bayonet columns; The left and right ends of the ground-connected wall monomer are respectively provided with bayonet grooves of the same shape, which are connected vertically, and the bayonet grooves of the two adjacent groups of ground-connected wall monomers correspond to each other; the bayonet column can be inserted into the bayonet grooves of the two adjacent groups of ground-connected wall monomers at the same time, and be fixed with the two bayonet grooves.

7. The prefabricated ground-connected wall with embedded freezing pipes according to claim 6, characterized in that: The cross section of the bayonet column is an axisymmetric figure, the bayonet slots of the two adjacent groups of ground-connected wall units on the left and right are opposite, and the space formed by the two bayonet slots is adapted to the shape and specification of the bayonet column; The outer surface of the bayonet column is covered with a water-stop adhesive strip.

8. The prefabricated ground-connected wall with embedded freezing pipes according to claim 1, characterized in that: The bottom center of the ground-connected wall monomer distributed on the upper layer is provided with a protruding portion, upper horizontal sections are symmetrically arranged on both sides of the protruding portion, and upper slope sections are symmetrically arranged outside the two horizontal sections; The top center of the ground-connected wall monomer distributed in the lower layer is provided with a recessed portion, lower horizontal sections are symmetrically arranged on both sides of the recessed portion, and lower slope sections are symmetrically arranged outside the two horizontal sections; The protrusions and recesses fit together and are distributed along the extension direction of the ground-connected wall. The outer surfaces of the protrusions and recesses are respectively covered with water-stop rubber. When the upper and lower adjacent groups of ground-connected wall monomers are aligned, the protrusions are tightly embedded in the recesses, the upper horizontal section fits tightly with the lower horizontal section, and the upper slope section fits tightly with the lower slope section.

9. The prefabricated ground-connected wall with embedded freezing pipes according to claim 1, characterized in that: There are also steel cages with the same number as the ground-connected wall units; The pre-buried freezing pipe is fixed in the steel cage, and the steel cage carrying the pre-buried freezing pipe is arranged inside the ground-connected wall monomer.

10. The construction method of the prefabricated ground-connected wall according to claim 6, characterized in that: The following steps are involved: S1. Hoist the first ground-connected wall unit into the groove of the ground-connected wall, hoist the bayonet column into the bayonet groove on one side of the ground-connected wall unit, and the height of the bayonet column is greater than the height of the ground-connected wall unit; hoist the second ground-connected wall unit from top to bottom along the bayonet column to the top of the first ground-connected wall unit, and then embed another bayonet column into the bayonet groove on one side of the second ground-connected wall unit, and repeat the above operation until the first row of vertical ground-connected walls are spliced; S2. After the first row of vertical ground-connected walls are spliced, another ground-connected wall unit is hoisted from top to bottom along the other side of the bayonet column of the first row of vertical ground-connected walls to the bottom of the groove of the ground-connected wall. Then, the second row of vertical ground-connected walls are spliced ​​according to the above operation, and the bayonet column is hoisted and embedded in the bayonet groove on the other side of the second row of vertical ground-connected walls. S3, repeat the operation of step S2 to complete the splicing of all ground-connected wall units; S4. Pour concrete into the weight-reducing hollow holes of the ground-connected wall unit. The concrete flows into the first connecting groove and the second connecting groove through the weight-reducing hollow holes, and then into the first reserved casting groove and the second reserved casting groove. After the concrete solidifies, the construction of the prefabricated ground-connected wall is completed.

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