Construction technology of underground continuous wall

Abstract

The present application relates to the technical field of continuous wall construction technology. In view of the problem that during the use of underground continuous walls, the soil layer at the bottom of the continuous wall is easily affected by ground loads and internal stress in the ground, which makes the underground continuous wall prone to uneven settlement, resulting in gaps at the joints between two adjacent unit wall sections, thereby causing water seepage in the underground continuous wall, etc. A construction technology for an underground continuous wall is provided. By adopting this technology, a crushed stone layer is provided at the bottom of the unit slot section and compacted to increase the stability of the soil layer at the bottom of the underground continuous wall. The crushed stone layer is then stabilized with cement mortar, and the bottom end of the underground continuous wall is fixed to the crushed stone layer. The present application has the effect of preventing the underground continuous wall from unevenly settling during use.

Description

Technical Field

[0001] The present application relates to the technical field of continuous wall construction technology, and in particular to a construction technology of an underground continuous wall. Background Art

[0002] Underground continuous walls are mainly used in building construction, especially in the construction of municipal supporting construction projects; underground continuous walls have the characteristics of high rigidity, strong integrity, good impermeability and durability. They can not only serve as enclosure structures to retain soil and water, but also as load-bearing structures to support the main body of the building; because underground continuous walls can be applied to a variety of complex foundation conditions, and in actual construction, they occupy less space, have high efficiency, short construction period, reliable quality and high economic benefits, underground continuous walls are increasingly widely used in underground enclosure structures with rich water content and complex strata and foundation projects requiring large bearing capacity.

[0003] At present, during the construction of prefabricated underground continuous walls, unit groove sections are dug in sequence at the construction location of the continuous wall, and then several prefabricated unit wall panels are hoisted into the dug unit groove sections in sequence. After that, cement mortar is used to compact and grout the joints of the prefabricated unit wall panels and the joints of adjacent unit wall sections to complete the construction of the underground continuous wall.

[0004] However, during the use of underground continuous walls, the soil layer at the bottom of the continuous wall is prone to flow due to the influence of ground load and internal stress in the ground, which makes the underground continuous wall prone to uneven settlement, resulting in gaps at the joints of two adjacent unit wall sections, thereby causing water seepage in the underground continuous wall. Summary of the Invention

[0005] In order to solve the problem that underground continuous walls are prone to uneven settlement during use, the present application provides a construction process for underground continuous walls.

[0006] This application provides a construction process for an underground continuous wall, which adopts the following technical solution:

[0007] A construction process for an underground continuous wall comprises the following steps:

[0008] Step 1: Excavation of unit trench sections: According to the construction requirements, use a grab bucket to dig a certain depth of unit trench sections downward at the construction location of the diaphragm wall. The excavation depth of the unit trench sections is 100-200cm greater than the design depth of the diaphragm wall.

[0009] Step 2: Compact the bottom of the unit trench. Put gravel into the excavated unit trench and use compaction equipment to beat and compact the gravel at the bottom of the unit trench to form a gravel layer. After compaction, the distance between the top of the unit trench and the top of the gravel layer is equal to the designed depth of the diaphragm wall. Then pour cement mortar into the unit trench so that the cement mortar is 10-20 cm higher than the gravel layer.

[0010] Step 3: Construction of the unit wall section: hoist the prefabricated unit wall panel into the unit slot section. When the upper end of the prefabricated unit wall panel is lowered to the top surface of the unit slot section, fix the prefabricated unit wall panel and then hoist another prefabricated unit wall panel. The bottom of the prefabricated unit wall panel hoisted later is spliced ​​with the top of the previous prefabricated unit wall panel and the two prefabricated unit wall panels are fixed. After the splicing is completed, continue to hoist and splice the subsequent wall panels until the bottom of the lowest prefabricated unit wall panel is embedded in the cement mortar and abuts against the gravel layer, forming a unit wall section.

[0011] Step 4: Repeat steps 1, 2 and 3, and when the subsequent unit trench segments are excavated, the interval between the unit trench segments excavated in the previous step is the width of a unit wall segment;

[0012] Step 5: Construction of the middle unit wall section: After the cement mortar in the two interval unit trough sections has solidified, use a grab bucket to continue digging the unit trough section between the two interval unit trough sections, and then repeat steps 2 and 3;

[0013] Step 6: Joint grouting: insert grouting pipes between two adjacent unit wall sections and inject cement mortar into the grouting pipes. While grouting, the grouting pipes gradually withdraw from the unit slot section. Perform compaction grouting treatment on the joints between two adjacent prefabricated unit wall panels and the joints between two adjacent unit wall sections to complete the construction of the underground continuous wall.

[0014] By adopting the above technical solution, a crushed stone layer is set at the bottom of the unit trench section and compacted to increase the stability of the soil layer at the bottom of the underground continuous wall. The crushed stone layer is then stabilized by cement mortar, and the bottom end of the underground continuous wall is fixed to the crushed stone layer. When the subsequent unit trench sections are excavated, the interval between the unit trench sections excavated last time is greater than the width of a unit wall section. When constructing the intermediate unit wall section, the cement mortar in the two spaced unit trench sections must be solidified before construction can be carried out, thereby reducing the impact on the unit wall section structure of the completed underground continuous wall, making it less likely for the underground continuous wall to have uneven settlement during use.

[0015] Optionally, steel sections are fixed on both sides of the prefabricated unit wall panels, a connecting block is fixed on the bottom end of the steel section, a plug-in slot for inserting the connecting block is opened at the top end of the steel section along the length direction of the steel section, and a fixing part for fixing the connecting block in the plug-in slot is provided on the steel section.

[0016] By adopting the above technical solution, when two prefabricated unit wall panels are spliced, the connecting block on the steel section on the upper prefabricated unit wall panel is inserted into the plug-in groove on the steel section on the lower prefabricated unit wall panel, which facilitates the positioning of the two prefabricated unit wall panels. Thereafter, the connecting block is fixed in the plug-in groove by the fixing parts to complete the splicing of the two prefabricated unit wall panels.

[0017] Optionally, a pipe groove is opened on the side of the steel section away from the prefabricated unit wall panel. After the construction of the unit wall section is completed, the steel sections on the side close to each other of the two adjacent unit wall sections fit together, and the pipe grooves on the two steel sections form a pipeline channel for inserting the grouting pipe.

[0018] By adopting the above technical solution, the grouting pipe can be easily inserted between the two unit wall sections through the pipeline channel, and the size of the joint between the two adjacent unit wall sections can be reduced by setting the pipe groove, thereby improving the sealing of the joint between the two unit wall sections.

[0019] Optionally, a cavity is provided inside the prefabricated unit wall panel, a steel cage is fixedly installed in the cavity, and a connecting port communicating with the cavity is provided on the side wall of the pipe groove.

[0020] By adopting the above technical solution, a cavity is set inside the prefabricated unit wall panel, thereby reducing the weight of the prefabricated unit wall panel and facilitating transportation and lifting; when the grouting pipe is grouting, cement mortar enters the cavity of the prefabricated unit wall panel through the connection port, filling the cavity and increasing the structural strength of the prefabricated unit wall panel.

[0021] Optionally, a plug is fixedly provided on the bottom wall of the prefabricated unit wall panel, a groove is provided on the top wall of the prefabricated unit wall panel for inserting the plug, a pre-buried pipe is embedded in the interior of the plug, a grouting seam connected to the pre-buried pipe is provided on the side wall of the plug, and the pre-buried pipe is connected to the cavity of the prefabricated unit wall panel.

[0022] By adopting the above technical solution, when two prefabricated unit wall panels are spliced, the plug on the upper prefabricated unit wall panel is inserted into the embedded groove of the lower prefabricated unit wall panel. When the grouting pipe is grouting, part of the cement mortar flows into the embedded groove through the grouting seam, thereby increasing the sealing of the joints between the two adjacent prefabricated unit wall panels and, to a certain extent, preventing the cement mortar from being unable to spread throughout the joints between the two adjacent prefabricated unit wall panels during grouting, resulting in water seepage between the two adjacent prefabricated unit wall panels.

[0023] Optionally, two ends of the insert block gradually approach each other in a direction away from the prefabricated unit wall panel.

[0024] By adopting the above technical solution, the two ends of the insert block gradually approach each other in the direction away from the prefabricated unit wall panel, which facilitates the insertion of the insert block into the embedding groove.

[0025] Optionally, when the grouting pipe is inserted into the pipeline channel formed by the steel sections on two adjacent unit wall sections, a rubber caulking strip is placed in the pipeline channel. When the grouting pipe exits the pipeline channel, the rubber caulking strip remains in the pipeline channel, and the rubber caulking strip is used to seal the joint between the two steel sections.

[0026] By adopting the above technical solution, the joints of the two steel sections are sealed with rubber caulking strips, which to a certain extent prevents the gaps in the joints of the two steel sections from being too large, resulting in the cement mortar flowing out through the gaps after the grouting is completed, causing the cement mortar to sink too much and requiring a second pouring; or leaks appearing at the joints of the two unit wall sections, affecting the anti-seepage capacity of the underground continuous wall.

[0027] Optionally, after the middle unit trench section is excavated, the remaining soil on the steel sections on both sides is brushed off.

[0028] By adopting the above technical solution, after the excavation of the middle unit trench section is completed, the soil remaining on the steel sections on both sides is brushed off to increase the adhesion between the cement mortar and the steel sections and increase the structural strength of the underground continuous wall.

[0029] Optionally, when the middle unit trough section is excavated, mud is injected into the middle unit trough section. After the residual mud on the steel sections on both sides is brushed off, the sediment at the bottom of the middle unit trough section is first removed by a grab bucket, and then the water in the middle unit trough section is pumped out by a water pump.

[0030] By adopting the above technical solution, mud is injected into the middle unit groove section, which makes it easier to brush off the mud on the steel sections on both sides.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. A crushed stone layer is laid at the bottom of the unit trench and compacted to increase the stability of the soil layer at the bottom of the underground continuous wall. The crushed stone layer is then stabilized with cement mortar, and the bottom end of the underground continuous wall is fixed to the crushed stone layer. When excavating subsequent unit trenches, the interval between the unit trenches excavated previously is greater than the width of one unit wall segment. When constructing intermediate unit wall segments, the cement mortar in the two separated unit trenches is also required to solidify before construction. This reduces the impact on the unit wall structure of the completed underground continuous wall and makes it less likely for the underground continuous wall to experience uneven settlement during use.

[0033] 2. When two prefabricated unit wall panels are spliced, the plug on the upper prefabricated unit wall panel is inserted into the embedded groove of the lower prefabricated unit wall panel. When the grouting pipe is grouting, part of the cement mortar flows into the embedded groove through the grouting seam, thereby increasing the sealing of the joints between the two adjacent prefabricated unit wall panels and, to a certain extent, preventing the cement mortar from being unable to spread throughout the joints between the two adjacent prefabricated unit wall panels during grouting, resulting in water seepage between the two adjacent prefabricated unit wall panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0035] Figure 2 This is a partial structural cross-sectional view of an embodiment of the present application, mainly used to express a schematic structural diagram of a prefabricated unit wall panel;

[0036] Figure 3 It is a partial structural diagram of an embodiment of the present application, mainly used to express the structural diagram of the joints between unit wall segments.

[0037] Explanation of the accompanying reference numerals: 1. Unit slot section; 2. Gravel layer; 3. Prefabricated unit wall panel; 31. Steel section; 311. Pipe slot; 312. Connecting block; 313. Insert slot; 314. Fixing piece; 32. Cavity; 33. Steel cage; 34. Connecting port; 35. Insert block; 351. Embedded pipe; 352. Grouting joint; 36. Embedded groove; 4. Unit wall section; 5. Grouting pipe; 6. Rubber caulking strip. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-3 This application is described in further detail.

[0039] The present application embodiment discloses a construction process for an underground continuous wall. Figure 1 , including the following steps:

[0040] Step 1: excavation of unit trench section 1;

[0041] Reference Figure 1 According to the construction requirements, a grab bucket is used to dig a unit trench section 1 of a certain depth at the construction position of the continuous wall. The excavation depth of the unit trench section 1 is 100-200 cm greater than the design depth of the continuous wall. The length of the unit trench section 1 is the length of a unit wall section 4, and the width of the unit trench section 1 is equal to the thickness of the prefabricated unit wall panel 3.

[0042] Step 2: compacting the bottom of unit trough section 1;

[0043] Reference Figure 1, put crushed stones into the excavated unit trench section 1, and use compaction equipment to knock and compact the crushed stones at the bottom of the unit trench section 1 to form a crushed stone layer 2. The top of the crushed stone layer 2 is horizontal, and after compaction, the distance between the top of the unit trench section 1 and the top of the crushed stone layer 2 is equal to the design depth of the continuous wall. Then pour cement mortar into the unit trench section 1 so that the cement mortar is 210-20cm higher than the crushed stone layer.

[0044] Step 3: Construction of unit wall section 4;

[0045] Reference Figure 1 , hoist the prefabricated unit wall panel 3 into the unit slot section 1. When the upper end of the prefabricated unit wall panel 3 is lowered to the top surface of the unit slot section 1, fix the prefabricated unit wall panel 3, and then hoist another prefabricated unit wall panel 3, so that the bottom of the prefabricated unit wall panel 3 hoisted later is spliced ​​with the top of the previous prefabricated unit wall panel 3, and fix the two prefabricated unit wall panels 3. After the splicing is completed, continue to hoist and splice the subsequent wall panels until the bottom of the lowest prefabricated unit wall panel 3 is embedded in the cement mortar and abuts against the gravel layer 2, forming a unit wall section 4.

[0046] Reference Figure 2 , steel sections 31 are fixedly installed on both sides of the prefabricated unit wall panel 3, the length direction of the steel section 31 is parallel to the height direction of the prefabricated unit wall panel 3, and the length of the steel section 31 is equal to the height of the prefabricated unit wall panel 3, and pipe grooves 311 are opened along the length direction of the steel section 31 on the side edges away from the prefabricated unit wall panel 3, and a cavity 32 is provided inside the prefabricated unit wall panel 3, and a steel cage 33 is fixedly installed in the cavity 32, and a connecting port 34 communicating with the cavity 32 is opened on the side wall of the pipe groove 311.

[0047] Reference Figure 2 A plug block 35 is fixedly provided at the bottom end of the prefabricated unit wall panel 3. The length of the plug block 35 is equal to the length of the prefabricated unit wall panel 3. A embedding groove 36 is provided on the top wall of the prefabricated unit wall panel 3. The embedding groove 36 is adapted to the plug block 35. A pre-buried pipe 351 is embedded in the interior of the plug block 35. A grouting seam 352 communicating with the pre-buried pipe 351 is provided on the side wall of the plug block 35 along the length direction of the plug block 35. The pre-buried pipe 351 is communicated with the cavity 32 of the prefabricated unit wall panel 3. The two ends of the plug block 35 gradually approach each other in the direction away from the prefabricated unit wall panel 3. When the prefabricated unit wall panels 3 are spliced, the plug block 35 on the upper prefabricated unit wall panel 3 is inserted into the embedding groove 36 of the lower prefabricated unit wall panel 3.

[0048] Reference Figure 2When the bolt 31 is in the closed position, the cam 314 is tightened to the screw thread on the top of the bracket 312, so that the cam 314 can be tightened to the screw thread on the bracket 312.

[0049] Step 4: Repeat steps 1, 2 and 3, and when subsequent unit trench segments 1 are excavated, they are separated from the unit trench segments 1 excavated previously by the width of a unit wall segment 4 to reduce the impact on the structure of the unit wall segment 4 of the completed underground continuous wall.

[0050] Step 5: Construction of the middle unit wall section 4;

[0051] Reference Figure 1 After the cement mortar in the two interval unit slot sections 1 has solidified, the grab bucket is used to continue excavating the unit slot section 1 between the two interval unit slot sections 1. While the middle unit slot section 1 is being excavated, slurry is injected into the middle unit slot section 1. After the excavation of the middle unit slot section 1 is completed, the soil remaining on the steel sections 31 on both sides is brushed off. When the soil remaining on the steel sections 31 on both sides is brushed off, the sediment at the bottom of the middle unit slot section 1 is first removed by the grab bucket, and then the water in the middle unit slot section 1 is pumped out by the water pump, thereby increasing the adhesion between the cement mortar and the steel sections 31 and increasing the structural strength of the underground continuous wall. Then, steps 2 and 3 are repeated.

[0052] Reference Figure 2 、 3 After the construction of the middle unit wall section 4 is completed, the steel sections 31 on one side of the two adjacent unit wall sections 4 are fitted together, and the pipe grooves 311 on the two steel sections 31 form a pipeline channel for inserting the grouting pipe 5.

[0053] Step 6: Joint grouting;

[0054] Reference Figure 3, insert the grouting pipe 5 into the pipeline channel between the two adjacent unit wall sections 4, and at the same time as the grouting pipe 5 is inserted into the pipeline channel, cut a rubber caulking strip 6 twice the depth of the underground continuous wall. The rubber caulking strip 6 is made of sponge rubber. The middle section of the cut rubber caulking strip 6 is abutted against the lower end of the grouting pipe 5. When the grouting pipe 5 is inserted into the pipeline channel, the rubber caulking strip 6 is brought into the pipeline channel together, and the joint between the two steel sections 31 is sealed by the rubber caulking strip 6.

[0055] Reference Figure 3 , cement mortar is injected into the grouting pipe 5. While grouting, the grouting pipe 5 gradually withdraws from the unit slot section 1. The rubber caulking strip 6 remains in the pipeline channel under the action of the gravity of the cement mortar, which to a certain extent prevents the gap at the joint of the two steel sections 31 from being too large, resulting in the cement mortar flowing out through the gap after the grouting is completed, causing the cement mortar to sink too much and requiring a second pouring; or leaking at the joint of the two unit wall sections 4, affecting the anti-seepage ability of the underground continuous wall.

[0056] Reference Figure 2 、 3 The cement mortar enters the cavity 32 of the prefabricated unit wall panel 3 through the connection port 34 to fill the cavity 32. Part of the cement mortar flows into the embedded groove 36 through the grouting seam 352 to seal the joints between the two adjacent prefabricated unit wall panels 3. To a certain extent, it prevents the cement mortar from being unable to spread throughout the joints between the two adjacent prefabricated unit wall panels 3 during grouting, resulting in water seepage between the two adjacent prefabricated unit wall panels 3, thereby completing the construction of the underground continuous wall.

[0057] The implementation principle of the construction process of an underground continuous wall in an embodiment of the present application is as follows: during the construction of the underground continuous wall, according to the construction requirements, a grab bucket is used to dig a unit trench section 1 of a certain depth downward at the construction position of the continuous wall. The digging depth of the unit trench section 1 is greater than the design depth of the continuous wall by 100-200 cm. The length of the unit trench section 1 is the length of a unit wall section 4. The width of the unit trench section 1 is equal to the thickness of the prefabricated unit wall panel 3. Gravel is put into the excavated unit trench section 1, and the gravel at the bottom of the unit trench section 1 is knocked and compacted by compacting equipment to form a gravel layer 2 to increase the stability of the soil layer at the bottom of the underground continuous wall. Cement mortar is poured into the unit trench section 1 so that the cement mortar is 210-20 cm higher than the gravel layer.

[0058] The prefabricated unit wall panel 3 is hoisted into the unit slot section 1. When the upper end of the prefabricated unit wall panel 3 is lowered to the top surface of the unit slot section 1, the prefabricated unit wall panel 3 is fixed, and then another prefabricated unit wall panel 3 is hoisted in, so that the plug block 35 on the upper prefabricated unit wall panel 3 is inserted into the embedding groove 36 of the lower prefabricated unit wall panel 3, and the connecting block 312 on the upper steel section 31 of the upper prefabricated unit wall panel 3 is inserted into the plug-in groove 313 on the upper steel section 31 of the lower prefabricated unit wall panel 3. The connecting block 312 is fixed in the plug-in groove 313 by bolts to complete the splicing of the two prefabricated unit wall panels 3. After the splicing is completed, the subsequent wall panels are continued to be hoisted and spliced ​​until the bottom of the lowest prefabricated unit wall panel 3 is embedded in the cement mortar and abuts against the gravel layer 2 to form a unit wall section 4.

[0059] Continue to excavate the unit trench section 1 and set the unit wall section 4 at a position where there is a unit wall section 4 between the unit trench section 1 excavated previously, so as to reduce the impact on the unit wall section 4 structure of the underground continuous wall that has been constructed. After the cement mortar in the two interval unit trench sections 1 has solidified, use a grab bucket to continue excavating the unit trench section 1 between the two interval unit trench sections 1. While the middle unit trench section 1 is excavated, slurry is injected into the middle unit trench section 1. After the excavation of the middle unit trench section 1 is completed, the soil remaining on the steel sections 31 on both sides is brushed off. After the soil remaining on the steel sections 31 on both sides is brushed off, the sediment at the bottom of the middle unit trench section 1 is first removed by the grab bucket, and then the water in the middle unit trench section 1 is pumped out by the water pump, and the hanging construction of the middle unit wall section 4 is continued. After the construction of the middle unit wall section 4 is completed, the steel sections 31 on the side close to each other of the two adjacent unit wall sections 4 are fitted together, and the pipe grooves 311 on the two steel sections 31 form a pipeline channel for inserting the grouting pipe 5.

[0060] Cut the rubber caulking strip 6 twice the depth of the underground continuous wall, and abut the middle section of the cut rubber caulking strip 6 against the lower end of the grouting pipe 5. Insert the grouting pipe 5 into the pipeline channel between the two adjacent unit wall sections 4. When the grouting pipe 5 is inserted into the pipeline channel, the rubber caulking strip 6 is brought into the pipeline channel together, and the joint of the two steel sections 31 is sealed by the rubber caulking strip 6. Cement mortar is injected into the grouting pipe 5. While grouting, the grouting pipe 5 gradually withdraws from the unit slot section 1. The rubber caulking strip 6 is subjected to the weight of the cement mortar. The action of force remains in the pipeline channel, and the cement mortar enters the cavity 32 of the prefabricated unit wall panel 3 through the connecting port 34 to fill the cavity 32. Part of the cement mortar flows into the embedded groove 36 through the grouting seam 352 to seal the joints between the two adjacent prefabricated unit wall panels 3, completing the construction of the underground continuous wall. By setting the gravel layer 2, the stability of the soil layer at the bottom of the underground continuous wall is increased, and the bottom end of the underground continuous wall is fixed to the gravel layer 2, so that the underground continuous wall is not prone to uneven settlement during use.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction process for an underground continuous wall, characterized in that: The following steps are involved: Step 1: excavating the unit trench section (1). According to the construction requirements, a grab bucket is used to dig a unit trench section (1) to a certain depth at the construction position of the continuous wall. The excavation depth of the unit trench section (1) is 100-200 cm greater than the design depth of the continuous wall. Step 2: compacting the bottom of the unit trough section (1), adding crushed stones into the excavated unit trough section (1), and using a compacting device to beat and compact the crushed stones at the bottom of the unit trough section (1) to form a crushed stone layer (2). After compaction is completed, the distance between the top of the unit trough section (1) and the top of the crushed stone layer (2) is equal to the designed depth of the continuous wall. Then, pour cement mortar into the unit trough section (1) so that the cement mortar is 10-20 cm higher than the crushed stone layer (2); Step 3, construction of the unit wall section (4), hoisting the prefabricated unit wall panel (3) into the unit slot section (1), when the upper end of the prefabricated unit wall panel (3) is lowered to the top surface of the unit slot section (1), the prefabricated unit wall panel (3) is fixed, and then hoisting another prefabricated unit wall panel (3), so that the bottom of the prefabricated unit wall panel (3) hoisted later is spliced ​​with the top of the previous prefabricated unit wall panel (3), and the two prefabricated unit wall panels (3) are fixed. After the splicing is completed, the subsequent wall panels are hoisted and spliced ​​until the bottom of the lowest prefabricated unit wall panel (3) is embedded in the cement mortar and abuts against the crushed stone layer (2), thereby forming a unit wall section (4); Step 4: Repeat steps 1, 2 and 3, and when the subsequent unit trench segments (1) are excavated, the interval between the unit trench segments (1) excavated the previous time is the width of a unit wall segment (4); Step 5: Construction of the middle unit wall section (4). When the cement mortar in the two separated unit trough sections (1) has solidified, a grab bucket is used to continue digging the unit trough section (1) between the two separated unit trough sections (1), and then steps 2 and 3 are repeated. Step 6: Joint grouting: insert a grouting pipe (5) between two adjacent unit wall sections (4), inject cement mortar into the grouting pipe (5), and gradually withdraw the grouting pipe (5) from the unit groove section (1) while grouting. Perform compaction grouting treatment on the joints between two adjacent prefabricated unit wall panels (3) and the joints between two adjacent unit wall sections (4), thereby completing the construction of the underground continuous wall. Section steels (31) are fixedly provided on both sides of the prefabricated unit wall panel (3), and a pipe groove (311) is provided on the side of the section steel (31) away from the prefabricated unit wall panel (3). After the construction of the unit wall section (4) is completed, the section steels (31) on the sides close to each other of the two adjacent unit wall sections (4) fit together, and the pipe grooves (311) on the two section steels (31) form a pipeline channel for inserting the grouting pipe (5).

2. The construction process of an underground continuous wall according to claim 1, characterized in that: A connecting block (312) is fixedly provided at the bottom end of the section steel (31), a plug-in slot (313) for inserting the connecting block (312) is provided at the top end of the section steel (31) along the length direction of the section steel (31), and a fixing piece (314) for fixing the connecting block (312) in the plug-in slot (313) is provided on the section steel (31).

3. The construction process of an underground continuous wall according to claim 1, characterized in that: A cavity (32) is provided inside the prefabricated unit wall panel (3), a steel cage (33) is fixedly arranged in the cavity (32), and a connecting port (34) communicating with the cavity (32) is provided on the side wall of the pipe groove (311).

4. The construction process of an underground continuous wall according to claim 3, characterized in that: The bottom wall of the prefabricated unit wall panel (3) is fixedly provided with an insert block (35); the top wall of the prefabricated unit wall panel (3) is provided with an embedding groove (36) for inserting the insert block (35) on the prefabricated unit wall panel (3); a pre-buried pipe (351) is embedded in the interior of the insert block (35); a grouting seam (352) communicating with the pre-buried pipe (351) is provided on the side wall of the insert block (35); and the pre-buried pipe (351) is communicated with the cavity (32) of the prefabricated unit wall panel (3).

5. The construction process of an underground continuous wall according to claim 4, characterized in that: The two ends of the insert block (35) gradually approach each other in a direction away from the prefabricated unit wall panel (3).

6. The construction process of an underground continuous wall according to claim 1, characterized in that: When the grouting pipe (5) is inserted into the pipeline channel formed by the upper steel sections (31) of two adjacent unit wall sections (4), a rubber caulking strip (6) is placed in the pipeline channel. When the grouting pipe (5) exits the pipeline channel, the rubber caulking strip (6) remains in the pipeline channel, and the rubber caulking strip (6) is used to seal the joint between the two steel sections (31).

7. The construction process of an underground continuous wall according to claim 1, characterized in that: After the middle unit trough section (1) is excavated, the soil remaining on the steel sections (31) on both sides is brushed off.

8. The construction process of an underground continuous wall according to claim 7, characterized in that: When the middle unit trough section (1) is excavated, mud is injected into the middle unit trough section (1). After the mud remaining on the steel sections (31) on both sides is brushed off, the sediment at the bottom of the middle unit trough section (1) is first removed by a grab bucket, and then the water in the middle unit trough section (1) is pumped out by a water pump.

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