Prefabricated structure of prefabricated diaphragm wall and construction method

Abstract

The invention provides a prefabricated structure of a prefabricated diaphragm wall and a construction method. The prefabricated structure comprises a prefabricated standard block, an insertion groove and a receiving groove which are formed in the height direction are formed in the two ends of the prefabricated standard block in the length direction correspondingly; receiving grooves formed in the vertical direction are formed in the two ends, in the length direction, of the prefabricated starting block; the two ends, in the length direction, of the prefabricated closing block are each provided with an insertion groove formed in the vertical direction; the groove bottom of the receiving groove is provided with a first embedded steel bar arranged upwards in the height direction. The groove top of the insertion groove is provided with a sealing gasket and a second embedded steel bar arranged downwards in the height direction; a reinforcing steel bar hole and a grouting hole are formed in the groove top; when the insertion groove is inserted into the receiving groove, the first embedded steel bars and the second embedded steel bars are arranged in a staggered mode and extend out of the steel bar holes. In the prefabricated structure of the prefabricated diaphragm wall, the plurality of prefabricated standard blocks are connected in sequence and are matched with the prefabricated starting block and the prefabricated closing block to be connected to form the closed prefabricated diaphragm wall.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated ground-connected walls, and in particular to a prefabricated structure and construction method of a prefabricated ground-connected wall. Background Art

[0002] New foundation pits are located in complex environments, often requiring strict deformation control. However, when constructing shallow foundation pits, traditional methods for ground-connected walls can lead to long construction periods, slow construction times, and uncertain quality assurance, potentially significantly impacting the surrounding environment. Furthermore, some prefabricated ground-connected walls often suffer from poor bending resistance and sealing at their joints. Summary of the Invention

[0003] The main purpose of the present invention is to provide a prefabricated structure and construction method of a prefabricated ground-connected wall to solve the technical problems of poor bending resistance and poor joint sealing at the joints of the prefabricated ground-connected wall.

[0004] To achieve the above-mentioned object, the present invention provides a prefabricated structure of a prefabricated ground-connected wall, comprising:

[0005] The prefabricated standard block has an insertion slot and a receiving slot respectively provided along the height direction at both ends along the length direction.

[0006] The prefabricated starting block has receiving grooves opened in the vertical direction at both ends along the length direction.

[0007] The prefabricated closing block has insertion slots opened in the vertical direction at both ends along the length direction.

[0008] The bottom of the receiving groove has a first embedded steel bar arranged upward along the height direction.

[0009] The top of the insertion slot has a sealing gasket and a second pre-embedded steel bar positioned downwardly along the height direction. The top of the slot is provided with a steel bar hole and a grouting hole. When the insertion slot is inserted into the receiving slot, the first pre-embedded steel bar and the second pre-embedded steel bar are arranged in a staggered manner and extend beyond the steel bar hole.

[0010] According to an embodiment of the present application, the length of the second embedded steel bar is 0.9 to 1.0 times the depth of the receiving groove. The length of the end of the first embedded steel bar extending beyond the steel bar hole is 15 cm to 20 cm.

[0011] According to an embodiment of the present application, it also includes an anchor and a clamp, which are used to fix the end of the first embedded steel bar after tensioning.

[0012] According to an embodiment of the present application, the bottom of the first embedded steel bar is anchored to the groove bottom.

[0013] According to an embodiment of the present application, the distance between the receiving groove and the corresponding end is 20 cm to 30 cm.

[0014] According to an embodiment of the present application, the prefabricated standard block includes:

[0015] The straight prefabricated standard block has the receiving groove opened along the length direction.

[0016] Turning to the prefabricated standard block, the opening direction of the receiving slot has an angle with the length direction.

[0017] According to an embodiment of the present application, the prefabricated steering standard blocks include prefabricated steering standard blocks with various angle specifications.

[0018] According to an embodiment of the present application, the blocks of the prefabricated standard block, the prefabricated starting block and the prefabricated closing block have prestressed steel bars arranged along the length direction on the excavation side.

[0019] The present application also discloses a construction method of a prefabricated ground-connected wall, comprising the following steps:

[0020] Step 1: Place the precast starting blocks in the ground tie wall groove.

[0021] Step 2: Hoist a prefabricated standard block into the ground-connected wall groove, and insert the insertion groove of the prefabricated standard block into the receiving groove of the prefabricated starting block. After the insertion is completed, tension the first embedded steel bar extending from the receiving groove of the prefabricated starting block, fix the first embedded steel bar, and compact the sealing gasket to play a water-stopping role, and then use the grouting hole to grout the groove space composed of the insertion groove and the receiving groove.

[0022] Step 3: Hoist the next prefabricated standard block into the ground-connected wall groove, and insert the insertion groove of the next prefabricated standard block into the receiving groove of the previous prefabricated standard block. After the insertion is completed, tension the first embedded steel bar extending from the receiving groove of the previous prefabricated standard block, fix the first embedded steel bar, and compact the sealing gasket to play a water-stopping role, and then use the grouting hole to grout the groove space composed of the insertion groove and the receiving groove.

[0023] Step 4: Repeat step 3 above until the last piece of prefabricated ground wall is constructed.

[0024] Step 5: Hoist the prefabricated closing block into the ground-connected wall groove, and insert the insertion grooves at both ends of the prefabricated closing block into the receiving groove of the prefabricated starting block and the receiving groove of the last prefabricated standard block respectively. After the insertion is completed, the first embedded steel bars extending from the receiving groove of the prefabricated starting block and the receiving groove of the last prefabricated standard block are tensioned respectively, and then the first embedded steel bars are fixed, and the sealing gasket is compacted to play a water-stopping role, and then the grouting holes are used to grout the groove space composed of the insertion groove and the receiving groove.

[0025] According to the implementation mode of the present application, it also includes:

[0026] A laser positioning and calibration device is used above the insertion slot and the receiving slot to accurately position the prefabricated standard block, the prefabricated starting block and the prefabricated closing block.

[0027] According to the implementation mode of the present application, it also includes:

[0028] Positioning pins, guide rails and hydraulic jacking devices are arranged above the wall sections of the installed prefabricated ground-connected walls.

[0029] In the prefabricated structure of the above-mentioned prefabricated ground-connected wall, multiple prefabricated standard blocks are connected in sequence, and are connected with prefabricated starting blocks and prefabricated closing blocks to form a closed prefabricated ground-connected wall. Any two adjacent blocks are connected by inserting the insertion groove into the receiving groove, and then the part of the first embedded steel bar extending from the steel bar hole is tensioned, so that the top of the insertion groove fits tightly above the opening of the receiving groove, and the sealing gasket is compacted to play a water-stopping role, so that the insertion groove and the receiving groove are surrounded by a well-sealed molding space. Grouting is carried out in the molding space from the grouting hole, and after solidification, a steel-concrete structure is formed to complete the connection, and at the same time, prestressing is applied to the wall section joints in the height direction. In this way, the bending resistance and joint sealing of the two adjacent blocks are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 It is a structural schematic diagram of a prefabricated standard block according to one embodiment of the present application.

[0032] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure in the AA direction.

[0033] Figure 3 It is a structural schematic diagram of a prefabricated starting block according to one embodiment of the present application.

[0034] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB direction.

[0035] Figure 5 It is a structural schematic diagram of a prefabricated closed block according to one embodiment of the present application.

[0036] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure in the CC direction.

[0037] Figure 7 This is a schematic diagram of the installation of the M1 prefabricated standard block according to one embodiment of the present application.

[0038] Figure 8 This is a schematic diagram of the insertion and installation of the M1 prefabricated standard block and the M2 prefabricated standard block according to one embodiment of the present application.

[0039] Figure 9 This is a schematic diagram of the grouting and tension anchoring installation of the M1 prefabricated standard blocks and the M2 prefabricated standard blocks according to one embodiment of the present application.

[0040] The realization of the objectives, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0041] 100, prefabricated standard block; 200, prefabricated starting block; 300, prefabricated closing block;

[0042] 10. Receiving trough; 11. First embedded steel bar;

[0043] 20. Insertion slot; 21. Second embedded steel bar; 22. Grouting hole; 23. Sealing pad;

[0044] a, excavation side; b, soil facing side;

[0045] 30. Prestressed steel bars; 40. Anchors. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0047] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0049] Moreover, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Reference Figures 1 to 6 The present invention provides a prefabricated structure of a prefabricated ground-connected wall, including a prefabricated standard block 100 (also known as a prefabricated wall section standard block), a prefabricated starting block 200 (also known as a prefabricated wall section initial block) and a prefabricated closing block 300 (also known as a prefabricated wall section closing block).

[0051] Reference Figure 1 and Figure 2 The prefabricated standard block 100 has an insertion slot 20 and a receiving slot 10 respectively opened along the height direction at both ends along the length direction. Figure 3 and Figure 4 , both ends of the prefabricated starting block 200 along the length direction have receiving grooves 10 opened along the vertical direction. Figure 5 and Figure 6 The prefabricated closing block 300 has an insertion slot 20 extending vertically at both ends along its length. The bottom of the receiving slot 10 has a first embedded rebar 11 extending upward in the height direction. The top of the insertion slot 20 has a sealing gasket 23 (e.g., a rubber gasket) and a second embedded rebar 21 extending downward in the height direction. The top of the slot is provided with a rebar hole and a grouting hole 22. When the insertion slot 20 is inserted into the receiving slot 10, the first embedded rebar 11 and the second embedded rebar 21 are arranged in a staggered manner, with the rebar holes extending outward.

[0052] There are multiple prefabricated standard blocks 100, each with identical specifications, such as length, height, and width. This does not apply to the prefabricated starting blocks 200 and prefabricated closing blocks 300. Their specific height and width can be the same as those of the prefabricated standard blocks 100 to maintain consistency in the overall height and width of the prefabricated ground ties. The lengths of the prefabricated starting blocks 200 and prefabricated closing blocks 300 can differ from those of the prefabricated standard blocks 100, providing greater flexibility and adaptability to prefabricated ground ties of varying shapes.

[0053] The precast standard block 100, precast starting block 200, and precast closing block 300 are all prefabricated components formed by pouring concrete and reinforced concrete. The insertion slots 20 of the precast standard block 100, precast starting block 200, and precast closing block 300 all have identical specifications, and the receiving slots 10 of the precast standard block 100, precast starting block 200, and precast closing block 300 all have identical specifications. This allows any two precast blocks to be connected if they match their insertion slots 20 and receiving slots 10.

[0054] Reference Figure 1 and Figure 2 The precast standard block 100 is provided with an insertion slot 20 and a receiving slot 10 at each end along its length. The precast starting block 200 also has a receiving slot 10 at each end along its length, reserving space for the subsequent insertion of the first standard block wall segment and the final closing block wall segment. The overall schematic diagram of the precast closing block 300 is shown below. Each side of the precast closing block 300 has an insertion slot 20. These two insertion slots 20 respectively insert into the receiving slot 10 of the preceding standard block and the receiving slot 10 of the precast starting block 200, ultimately closing the ground-connected wall into a unified whole.

[0055] Reference Figure 1 and Figure 2 The bottom of the receiving trough 10 is located below the corresponding prefabricated block and has a first embedded steel bar 11 arranged upward in the height direction. The number of the first embedded steel bars 11 is not limited and can be distributed in multiple rows and columns as needed. The specific specifications of the first embedded steel bars 11 are not limited and can be set according to design requirements. The length of the steel bars in the receiving trough 10 must be reserved to be longer, greater than the depth of the insertion groove 20, so that they can extend upward from the insertion groove 20 to facilitate subsequent tensioning of the steel bars to apply prestress to the joint area.

[0056] Reference Figure 1 and Figure 2The top of the insertion slot 20, located above the corresponding prefabricated block, is equipped with a sealing gasket 23 and second embedded rebar 21 arranged downwardly along the height direction. Similarly, the number of second embedded rebars 21 is not limited and can be arranged in multiple rows and columns as needed. The specific specifications of the second embedded rebar 21 are not limited and can be set according to design requirements. Rebar holes and grouting holes 22 are defined at the top of the slot.

[0057] The embedded steel bars in the insertion slots 20 and receiving slots 10 are arranged in a staggered arrangement so that when the insertion slots 20 of the subsequent wall section are inserted into the receiving slots 10 of the preceding wall section, the steel bars in the slots can be staggered. After the insertion slots 20 of the subsequent wall section are inserted into the receiving slots 10 of the preceding wall section, the steel bars extending from the receiving slots 10 are tensioned. After tensioning is completed, the steel bars are secured using anchors 40 and clamps, and grouting is performed into the slots through the reserved grouting holes above the insertion slots 20 to achieve a reliable connection between the two wall sections. This also applies prestressing along the height direction to the wall section joint, improving the bending resistance of the wall section joint.

[0058] The design of the insertion slots 20 and receiving slots 10 enables quick and accurate connection between prefabricated blocks, improving construction efficiency. The provision of sealing gaskets 23 effectively prevents moisture infiltration, ensuring the waterproof performance of the ground-connected wall. The staggered arrangement of embedded rebar strengthens the connection between prefabricated blocks and enhances the overall stability of the ground-connected wall.

[0059] In the prefabricated structure of the above-mentioned prefabricated ground-connected wall, a plurality of prefabricated standard blocks 100 are connected in sequence, and are connected with the prefabricated starting block 200 and the prefabricated closing block 300 to form a closed prefabricated ground-connected wall. Any two adjacent blocks are connected by inserting the insertion groove 20 into the receiving groove 10, and then the part of the first embedded steel bar 11 extending from the steel bar hole is tensioned, so that the top of the insertion groove 20 fits tightly above the opening of the receiving groove 10, and the sealing gasket 23 is compacted to play a water-stopping role, so that the insertion groove 20 and the receiving groove 10 are surrounded by a molding space with good sealing performance. Grouting is carried out in the molding space from the grouting hole 22, and after solidification, a steel-concrete structure is formed to complete the connection. In this way, the bending resistance and joint sealing of the two adjacent blocks are greatly improved.

[0060] In some embodiments, reference Figure 1 and Figure 2 The length of the second embedded steel bar 21 is 0.9-1.0 times the depth of the receiving groove 10. The length of the end of the first embedded steel bar 11 that extends beyond the steel bar hole is 15cm to 20cm.

[0061] This allows the second pre-embedded rebar 21 to be almost completely inserted into the bottom of the receiving groove 10, enhancing the strength of the formed space. Furthermore, the end length beyond the rebar hole meets design requirements, facilitating tensioning construction. Precise rebar sizing improves the overall structural performance of the ground-connected wall and ensures construction quality.

[0062] In some embodiments, reference Figure 9 The structure also includes an anchor 40 and a clamp for securing the ends of the first pre-embedded steel bars 11 after tensioning. The use of the anchor 40 and clamp simplifies the tensioning and securing of the steel bars, improving construction efficiency. Furthermore, the pre-embedded steel bars are effectively tensioned, enhancing the overall structural stability of the ground-connected wall.

[0063] In some embodiments, reference Figure 1 and Figure 2 The bottom of the first embedded steel bar 11 is anchored to the bottom of the groove. This anchoring connection enhances the stability of the embedded steel bar, ensuring the overall structural performance of the ground-connected wall. It also improves safety during construction and reduces construction risks.

[0064] In some embodiments, the receiving groove 10 is 20 to 30 cm from the corresponding end. This rational positioning of the receiving groove 10 ensures accurate connection between prefabricated blocks, improves construction accuracy, optimizes the overall structural layout of the ground-connected wall, and enhances construction quality. Furthermore, it also ensures the inherent strength of the receiving groove 10, ensuring its high strength during fabrication and construction.

[0065] In some embodiments, the prefabricated standard block 100 includes a linear prefabricated standard block 100 and a steering prefabricated standard block 100. The receiving slot 10 of the linear prefabricated standard block 100 is opened along the length direction; the opening direction of the receiving slot 10 of the steering prefabricated standard block 100 forms an angle with the length direction.

[0066] The linear precast standard blocks 100 are arranged along a straight line, while the turning precast standard blocks 100 are used for turning. Therefore, when the direction of the precast wall section corresponding to the next precast standard block 100 needs to be changed, the orientation of the receiving slots 10 of the previous precast standard block 100 also needs to be changed accordingly. For example, if the precast wall section needs to be turned 90°, the opening direction of the receiving slots 10 of the turning precast standard block 100 is at a 90° angle to the longitudinal direction, achieving a 90° turn between the next linear precast standard block 100 and the turning precast standard block 100.

[0067] In some embodiments, the prefabricated standard blocks 100 include various angles (e.g., 15°, 45°, 60°, 75°, 100°, and 175°). This diverse design of prefabricated standard blocks 100 accommodates the construction requirements of ground-connected walls of varying shapes and orientations, improving the system's adaptability. The design of prefabricated standard blocks 100 increases construction flexibility and adapts better to complex engineering environments.

[0068] In some embodiments, reference Figure 1 、 Figure 3 and Figure 5 The prefabricated standard block 100, the prefabricated starting block 200 and the prefabricated closing block 300 have prestressed steel bars 30 arranged along the length direction on the excavation side a.

[0069] The installation of prestressed steel bars 30 enhances the structural strength of the precast blocks and improves the overall performance of the ground-connected wall. This ensures the stability of the precast blocks during construction and improves construction quality. Prestressed steel bars 30 are added to the wall section near the excavation side a (the other side is the soil-facing side b) to increase the wall's bending resistance and resist deformation into the pit during excavation.

[0070] This application also discloses a construction method of a prefabricated ground-connected wall, referring to Figures 7 to 9 , including the following steps:

[0071] Step 1: Place the prefabricated starting block 200 in the ground-connected wall groove.

[0072] Step 2: Hoist the prefabricated standard block 100 into the ground-connected wall groove, and insert the insertion groove 20 of the prefabricated standard block 100 into the receiving groove 10 of the prefabricated starting block 200. After the insertion is completed, the first embedded steel bar 11 extending from the receiving groove 10 of the prefabricated starting block 200 is tensioned, the first embedded steel bar 11 is fixed, and the sealing gasket 23 is compacted to provide a water-stopping effect. Grouting is then performed through the grouting holes 22 into the groove space formed by the insertion groove 20 and the receiving groove 10 to achieve a reliable connection between the two wall sections. At the same time, prestressing is applied to the wall section joint along the height direction, thereby improving the bending resistance of the wall section joint.

[0073] Step 3: Hoist the next precast standard block 100 into the ground-connected wall groove, inserting the insertion groove 20 of the next precast standard block 100 into the receiving groove 10 of the previous precast standard block 100. After insertion, tension the first embedded steel bars 11 extending from the receiving groove 10 of the previous precast standard block 100, secure them, and compact the sealing gasket 23 to provide a water-stopping effect. Grouting is then performed into the groove space formed by the insertion groove 20 and the receiving groove 10 using the grouting holes 22.

[0074] Step 4: Repeat step 3 above until the last piece of prefabricated diaphragm wall is constructed;

[0075] Step 5: Hoist the prefabricated closing block 300 into the ground-connected wall groove, and insert the insertion grooves 20 at both ends of the prefabricated closing block 300 into the receiving groove 10 of the prefabricated starting block 200 and the receiving groove 10 of the last prefabricated standard block 100 respectively. After the insertion is completed, the first embedded steel bars 11 extending from the receiving groove 10 of the prefabricated starting block 200 and the receiving groove 10 of the last prefabricated standard block 100 are tensioned respectively, and then the first embedded steel bars 11 are fixed, and the sealing gasket 23 is compacted to play a water-stopping role, and then the grouting holes 22 are used to grout the groove space composed of the insertion groove 20 and the receiving groove 10.

[0076] The above-mentioned construction method of the prefabricated ground-connected wall has high construction efficiency. A plurality of prefabricated standard blocks 100 are connected in sequence, and are connected with the prefabricated starting block 200 and the prefabricated closing block 300 to form a closed prefabricated ground-connected wall. Any two adjacent blocks are connected by inserting the insertion groove 20 into the receiving groove 10, and then the part of the first embedded steel bar 11 extending from the steel bar hole is tensioned, so that the top of the insertion groove 20 fits tightly above the opening of the receiving groove 10, and the sealing gasket 23 is compacted to play a water-stopping role, so that the insertion groove 20 and the receiving groove 10 are surrounded by a molding space with good sealing performance. Grouting is carried out in the molding space from the grouting hole 22, and a steel-concrete structure is formed after solidification to complete the connection. At the same time, prestressing is also applied to the wall section joints in the height direction. In this way, the bending resistance and joint sealing of the joints of the two adjacent blocks are greatly improved.

[0077] In some embodiments, further comprising:

[0078] A laser positioning and calibration device is used above the insertion slot 20 and the receiving slot 10 to accurately position the prefabricated standard block 100 , the prefabricated starting block 200 and the prefabricated closing block 300 .

[0079] The laser positioning and calibration device can ensure the precise positioning of prefabricated blocks, improve construction accuracy, and improve the connection quality between prefabricated blocks, ensuring the overall performance of the ground-connected wall.

[0080] In some embodiments, further comprising:

[0081] Positioning pins, guide rails and hydraulic jacking devices are arranged above the wall sections of the installed prefabricated ground-connected walls.

[0082] The use of locating pins, guide rails and hydraulic jacking devices ensures that wall sections can be aligned quickly and accurately when spliced, while achieving instant correction of wall sections and reducing manual operation errors, significantly improving construction efficiency, shortening splicing time and reducing construction costs.

[0083] The construction method of the prefabricated ground-connected wall of the present application is described below with reference to a detailed embodiment.

[0084] The specific construction steps of the construction method of the prefabricated ground-connected wall are as follows:

[0085] Step 1: Construct guide wall.

[0086] Step 2: Use machinery to excavate the trench and fill it with slurry.

[0087] Step 3: Hoist the initial block C1 of the prefabricated wall section into the trench.

[0088] Step 4: Reference Figures 7 to 9 , hoist the first section of prefabricated wall section standard block M1 into the slot, and insert the insertion slot of M1 into the receiving slot of the prefabricated wall section standard block C1. After the insertion is completed, tension the steel bars extending from the receiving slot of C1. After the tensioning is completed, use anchors and clamps to fix the steel bars, and compact the rubber sealing pad to play a water-stopping role. Use the grouting holes to grout into the slot to achieve a reliable connection between the two wall sections. At the same time, prestressing is applied to the wall section joints along the height direction to improve the bending resistance of the wall section joints.

[0089] Step 5: Hoist the second section of prefabricated wall section standard block M2 into the slot, and insert the insertion slot of M2 into the receiving slot of M1. After the insertion is completed, tension the steel bars extending from the receiving slot of M1. After the tensioning is completed, use anchors and clamps to fix the steel bars, and compact the rubber sealing pad to play a water-stopping role. Use the grouting holes to grout into the slot to achieve a reliable connection between the two wall sections. At the same time, prestressing is applied to the wall section joints along the height direction to improve the bending resistance of the wall section joints.

[0090] Step 6: Hoist the third section of prefabricated wall section standard block M3 into the slot, and insert the insertion slot of M3 into the receiving slot of M2. After the insertion is completed, tension the steel bars extending from the receiving slot of M2. After the tensioning is completed, use anchors and clamps to fix the steel bars, and compact the rubber sealing pad to play a water-stopping role. Use the grouting holes to grout into the slot to achieve a reliable connection between the two wall sections. At the same time, prestressing is applied to the wall section joints along the height direction to improve the bending resistance of the wall section joints.

[0091] Step 7: Repeat steps 5 to 6 above until the last section of the foundation pit retaining structure is constructed.

[0092] Step 8: Hoist the closing block B1 into the slot, insert the two insertion slots of B1 into the receiving slot of the previous standard block and the receiving slot of the initial block respectively. After the insertion is completed, tension the steel bars extending from the receiving slot of the previous standard block and the receiving slot of the initial block C1. After the tensioning is completed, use anchors and clamps to fix the steel bars, compact the rubber sealing pad to play a water-stopping role, and use the grouting holes to grout into the slot.

[0093] The above technical solutions of the present invention are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A prefabricated structure of a prefabricated ground-connected wall, characterized in that: include: The prefabricated standard block has an insertion slot and a receiving slot opened in the height direction at both ends along the length direction; The prefabricated starting block has receiving slots opened in the vertical direction at both ends along the length direction; The prefabricated closing block has an insertion slot opened in the vertical direction at both ends along the length direction; The bottom of the receiving trough has a first embedded steel bar arranged upward in the height direction; The top of the insertion groove has a sealing gasket and a second embedded steel bar arranged downward in the height direction; the top of the groove is provided with a steel bar hole and a grouting hole; the insertion groove is configured so that when it is inserted into the receiving groove, the first embedded steel bar and the second embedded steel bar are arranged alternately and extend out of the steel bar hole.

2. The prefabricated structure of the prefabricated ground connecting wall according to claim 1, characterized in that: The length of the second embedded steel bar is 0.9 to 1.0 times the depth of the receiving groove; the length of the end of the first embedded steel bar extending beyond the steel bar hole is 15 cm to 20 cm.

3. The prefabricated structure of the prefabricated ground connecting wall according to claim 1, characterized in that: It also includes an anchor and a clamp, which are used to fix the end of the first embedded steel bar after tensioning.

4. The prefabricated structure of the prefabricated ground connecting wall according to claim 3, characterized in that: The bottom of the first embedded steel bar is anchored to the groove bottom.

5. The prefabricated structure of the prefabricated ground connecting wall according to claim 3, characterized in that: The distance between the receiving groove and the corresponding end is 20 cm to 30 cm.

6. The prefabricated structure of the prefabricated ground connection wall according to claim 1, characterized in that: The prefabricated standard blocks include: A straight prefabricated standard block, wherein the receiving slot is opened along the length direction; Turning to the prefabricated standard block, the opening direction of the receiving slot has an angle with the length direction.

7. The prefabricated structure of the prefabricated ground connecting wall according to claim 6, characterized in that: The prefabricated steering standard blocks include prefabricated steering standard blocks with various angle specifications.

8. The prefabricated structure of the prefabricated ground connecting wall according to claim 1, characterized in that: The blocks of the prefabricated standard block, the prefabricated starting block and the prefabricated closing block have prestressed steel bars arranged along the length direction on the excavation side.

9. A construction method for a prefabricated ground-connected wall, characterized in that: The following steps are involved: Step 1: Place the prefabricated starting block in the ground wall groove; Step 2: hoisting a prefabricated standard block into the ground-connected wall groove, and inserting the insertion groove of the prefabricated standard block into the receiving groove of the prefabricated starting block; after the insertion is completed, tensioning the first embedded steel bar extending from the receiving groove of the prefabricated starting block, fixing the first embedded steel bar, and compacting the sealing gasket to achieve a water-stopping effect; and then using the grouting hole to grout the groove space formed by the insertion groove and the receiving groove; Step 3: hoisting the next prefabricated standard block into the ground-connected wall groove, and inserting the insertion groove of the next prefabricated standard block into the receiving groove of the previous prefabricated standard block; after the insertion is completed, tensioning the first embedded steel bar extending from the receiving groove of the previous prefabricated standard block, fixing the first embedded steel bar, and compacting the sealing gasket to achieve a water-stopping effect; and then using the grouting hole to grout the groove space formed by the insertion groove and the receiving groove; Step 4: Repeat step 3 above until the last piece of prefabricated diaphragm wall is constructed; Step 5: Hoist the prefabricated closing block into the ground-connected wall groove, and insert the insertion grooves at both ends of the prefabricated closing block into the receiving groove of the prefabricated starting block and the receiving groove of the last prefabricated standard block respectively. After the insertion is completed, the first embedded steel bars extending from the receiving groove of the prefabricated starting block and the receiving groove of the last prefabricated standard block are tensioned respectively, and then the first embedded steel bars are fixed, and the sealing gasket is compacted to play a water-stopping role, and then the grouting holes are used to grout the groove space composed of the insertion groove and the receiving groove.

10. The construction method of the prefabricated ground-connected wall according to claim 9, characterized in that: Also includes: A laser positioning and calibration device is used above the insertion slot and the receiving slot to accurately position the prefabricated standard block, the prefabricated starting block and the prefabricated closing block.

11. The construction method of the prefabricated ground-connected wall according to claim 9, characterized in that: Also includes: Positioning pins, guide rails and hydraulic jacking devices are arranged above the wall sections of the installed prefabricated ground-connected walls.

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