Prefabricated underground diaphragm wall using expansion member and construction method thereof

Abstract

The invention discloses a prefabricated underground diaphragm wall using an expansion component and a construction method thereof, and aims to provide a prefabricated underground diaphragm wall using an expansion component and a construction method thereof, which can effectively solve the problems that the water stop effect of the prefabricated underground diaphragm wall is affected due to the fact that the prefabricated wall bodies are easy to loosen because a larger gap exists in an occlusion structure between the existing prefabricated wall bodies. The prefabricated underground diaphragm wall using the expansion component and the construction method thereof are used for solving the problems in the prior art. The prefabricated underground diaphragm wall using the expansion component comprises the expansion component and a plurality of prefabricated wall bodies which are sequentially distributed, and any two adjacent prefabricated wall bodies are connected through a meshing structure; an insertion cavity is formed between any two adjacent prefabricated wall bodies, an expansion component is inserted into the insertion cavity, and the expansion component provides expansion force to open the two adjacent prefabricated wall bodies, so that the meshing structures between the two adjacent prefabricated wall bodies are tensioned mutually.

Description

Technical Field

[0001] The invention relates to the field of underground continuous walls, and in particular to a prefabricated underground continuous wall utilizing expansion components and a construction method thereof. Background Art

[0002] Underground continuous walls are widely used in foundation pit retaining projects due to their advantages such as high overall rigidity and good water-stopping effect. Underground continuous walls are divided into cast-in-place underground continuous walls and prefabricated underground continuous walls. Among them, prefabricated underground continuous walls have the advantages of high strength, factory production, high construction efficiency, saving construction sites and green environmental protection, and are widely used.

[0003] A prefabricated underground continuous wall generally includes several prefabricated walls arranged side by side. Any two adjacent prefabricated walls are interlocked and connected with each other to form an underground continuous wall. However, due to the low manufacturing precision of the prefabricated walls, there will be large gaps in the interlocking structures (such as mortise and tenon interlocking joints) between the prefabricated walls, which makes it easy for the prefabricated walls to loosen, affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a prefabricated underground continuous wall using expansion components and a construction method thereof, which can effectively solve the problem that there are large gaps in the interlocking structure between the current prefabricated walls, which makes the prefabricated walls easy to loosen, affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0005] The technical solution of the present invention is: A prefabricated underground continuous wall using expansion components, including a number of prefabricated walls distributed in sequence, any two adjacent prefabricated walls are connected by an interlocking structure; and also including an expansion component, an insertion cavity is provided between any two adjacent prefabricated walls, an expansion component is inserted in the insertion cavity, and the expansion component provides an expansion force to open up the two adjacent prefabricated walls, so that the interlocking structures between the two adjacent prefabricated walls are mutually tightened. In a prefabricated underground continuous wall of this scheme, after the prefabricated wall is inserted into cement soil and before the cement soil is solidified, an expansion component is inserted between the two adjacent prefabricated walls, and the expansion force provided by the expansion component is used to open up the two adjacent prefabricated walls until the interlocking structures between the two adjacent prefabricated walls are mutually tightened. In the prefabricated underground continuous wall, any two adjacent prefabricated walls are opened up by the expansion component, so that the interlocking structures between the two adjacent prefabricated walls are mutually tightened. In this way, the prefabricated walls in the prefabricated underground continuous wall are tightened against each other, thereby effectively avoiding looseness between the prefabricated walls and improving the stability and water-stopping effect of the prefabricated underground continuous wall; thereby effectively solving the problem of large gaps in the interlocking structure between the current prefabricated walls, which makes it easy for the prefabricated walls to loosen, affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0006] Preferably, the expansion member comprises: Two cross-distributed expansion elements that are hingedly connected via a rotating shaft; An expansion screw rod is located between the two expansion elements, one end of which is connected to the rotating shaft and extends radially along the rotating shaft, and a fastening nut is provided on the expansion screw rod; The expansion wedge sliding along the expansion screw is located between the two expansion elements; when the expansion wedge moves along the expansion screw toward the rotation axis, the expansion wedge spreads the two expansion elements apart. The specific use of the expansion component of this scheme is as follows: after the prefabricated wall is inserted into the cement soil and before the cement soil solidifies, the expansion component is inserted between two adjacent prefabricated walls; then, the fastening nut is tightened, and the expansion wedge moves downward along the expansion screw, and the expansion wedge rests between the two expansion elements, spreading the two expansion elements apart, thereby spreading the two adjacent prefabricated walls apart in the horizontal direction until the interlocking structure between the two adjacent prefabricated walls is tightened to each other.

[0007] Preferably, the two opposite sides of the expansion wedge block facing the two expansion elements are inclined wedge surfaces, and the two inclined wedge surfaces are distributed in a V shape. In this way, when the expansion wedge block moves along the expansion screw toward the rotation axis, the expansion wedge block abuts against the two expansion elements through the inclined wedge surfaces, which is conducive to expanding the two expansion elements.

[0008] Preferably, the two cross-distributed expansion elements are distributed in an X shape. In this way, when the expansion wedge moves along the expansion screw toward the rotation axis, the upper and lower ends of the two expansion elements are both spread apart, and the expansion elements can be pressed against the prefabricated wall through the upper and lower ends to spread apart the two adjacent prefabricated walls in the horizontal direction, which is beneficial to spread apart the two adjacent prefabricated walls and improve the stability of the prefabricated wall after being spread apart.

[0009] Preferably, there are two fastening nuts, and the two fastening nuts are located on the same side of the expansion wedge. Of the two fastening nuts, one fastening nut close to the expansion wedge is used to push the expansion wedge to move and spread the two expansion elements apart; the other fastening nut is tightened after the interlocking structure between the two adjacent prefabricated walls is tightened to serve as an anti-loosening device for the fastening nut close to the expansion wedge to prevent the fastening nut from loosening.

[0010] Preferably, the bite structure comprises: Embedded bolt assembly, embedded in the prefabricated wall; A first rigid lock buckle is locked and fixed on a prefabricated wall by means of a pre-embedded bolt assembly; The second rigid lock is locked and fixed to another adjacent prefabricated wall by means of an embedded bolt assembly, and the first rigid lock is engaged with the second rigid lock so that the two adjacent prefabricated walls are engaged and connected. The prefabricated walls in the prior art are generally reinforced concrete walls, and the prefabricated walls are engaged and connected by means of plain concrete mortise and tenon joints. Since the underground continuous wall is subjected to relatively complex soil pressure during use, and the plain concrete mortise and tenon joints of the prefabricated reinforced concrete walls are fragile, the load bearing capacity of each prefabricated reinforced concrete wall at the plain concrete mortise and tenon joints is poor and prone to cracking. On the other hand, the plain concrete mortise and tenon joints of the prefabricated reinforced concrete walls are fragile and easily damaged by bumps, and the manufacturing molds of the prefabricated reinforced concrete walls are complicated and cumbersome. The prefabricated wall connection structure of the prefabricated underground continuous wall of this scheme adopts a rigid lock assembly bite connection. Compared with the plain concrete mortise and tenon joints in the prior art, the rigid lock assembly (the first rigid lock and the second rigid lock) has high strength and is not easy to damage. The first rigid lock and the second rigid lock are connected to the prefabricated wall through the embedded bolt assembly, and the connection strength is good (the first rigid lock and the second rigid lock will not crack between the prefabricated wall), so it can effectively improve the load bearing capacity between the prefabricated walls, so that it can withstand complex soil pressure and actively applied axial force, thereby effectively solving the problem of easy cracking of the prefabricated wall at the plain concrete mortise and tenon joints in the prior art. At the same time, the surface of the rigid lock is smooth and flat, and it is easy to bite when the prefabricated wall is inserted. The first rigid lock and the second rigid lock are connected to the prefabricated wall through the embedded bolt assembly, which can also simplify the production mold of the prefabricated wall.

[0011] Preferably, the first rigid lock buckles and the second rigid lock buckles of the same bite structure are both two and correspond to each other. The two first rigid lock buckles are distributed on both sides of the thickness direction of the prefabricated wall, and the second rigid lock buckles are distributed on both sides of the thickness direction of the prefabricated wall. The insertion cavity is located between the two first rigid lock buckles. In this way, after the expansion component provides an expansion force to open the two adjacent prefabricated walls and tighten the bite structure between the two adjacent prefabricated walls, the two first rigid lock buckles of the same bite structure are tightened with the corresponding second rigid lock buckles, which can ensure the stability of the two adjacent prefabricated walls.

[0012] Preferably, the cross section of the prefabricated wall is I-shaped, and both pairs of side walls of the prefabricated wall are provided with vertical grooves extending up and down, and the vertical groove between the two prefabricated walls constitutes the insertion cavity.

[0013] Preferably, the outer wall of the prefabricated wall is provided with a plurality of preset bolt holes distributed sequentially from top to bottom, and preset bolts are connected in the preset bolt holes. In this way, after the subsequent foundation pit excavation, the preset bolt holes on the prefabricated wall can be used to connect the concrete waist beam or steel waist beam of the support system, and can also be used to connect the waterproof material of the basement outer wall.

[0014] A construction method of a prefabricated underground continuous wall using an expansion member comprises the following steps: Construction of cement soil continuous wall; The piling process is to insert the prefabricated walls into the cement-soil continuous wall in sequence along the length direction of the cement-soil continuous wall, and any two adjacent prefabricated walls are connected by a bite structure; In the expansion process, before the cement soil of the cement soil continuous wall is solidified, the expansion component is inserted into the insertion cavity, and then the two adjacent prefabricated walls are stretched apart by the expansion component until the interlocking structures between the two adjacent prefabricated walls are tightened against each other. The prefabricated walls in the prefabricated underground continuous wall are tightened against each other, thereby effectively avoiding looseness between the prefabricated walls and improving the stability and water-stopping effect of the prefabricated underground continuous wall; thus, it can effectively solve the problem that there are large gaps in the interlocking structures between the prefabricated walls, which makes it easy for the prefabricated walls to loosen, thereby affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0015] As a preference, the method further comprises the following steps: After the expansion process is completed, anti-loosening elements are inserted between the gaps of the bite structure to prevent the bite structure from loosening.

[0016] The beneficial effects of the present invention are: Firstly, it can effectively solve the problem that there are large gaps in the interlocking structure between the current prefabricated walls, which makes it easy for the prefabricated walls to loosen, thus affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0017] Secondly, it can effectively improve the load bearing capacity of prefabricated walls, so that they can withstand complex soil pressure and actively applied axial force, thereby effectively solving the problem of easy cracking at the plain concrete mortise and tenon joints of prefabricated walls in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional partial structural schematic diagram of a prefabricated underground continuous wall using expansion components of the present invention.

[0019] Figure 2 It is a schematic diagram of a three-dimensional structure of the expansion member of the present invention.

[0020] Figure 3 It is a partial top view of the prefabricated underground continuous wall using expansion components of the present invention.

[0021] Figure 4 It is a partial top view of a certain embodiment of the occlusal structure of the present invention.

[0022] In the figure: Prefabricated wall 1, opposite side wall 1.1, outer side wall 1.2; Engagement structure 2, embedded bolt assembly 2.1, embedded screw sleeve 2.1.1, connecting bolt 2.1.2, first rigid lock 2.2, first fixing part 2.2.1, first engagement part 2.2.2, second rigid lock 2.3; Expansion member 3, expansion element 3.1, main steel plate 3.1.1, connecting steel plate 3.1.2, rotating shaft 3.2, expansion screw 3.3, expansion wedge block 3.4, inclined wedge surface 3.4.1, fastening nut 3.5; Insert into cavity 4. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Specific embodiment 1, as Figure 1 , Figure 2 , Figure 3As shown, a prefabricated underground continuous wall using expansion components includes an expansion component 3 and a plurality of prefabricated walls 1 distributed in sequence. Any two prefabricated walls 1 distributed adjacently are connected by a bite structure 2. There is an insertion cavity 4 between any two prefabricated walls 1 distributed adjacently. An expansion component 3 is inserted in the insertion cavity 4. The expansion component 3 provides an expansion force to open two adjacent prefabricated walls 1 so that the bite structure 2 between the two adjacent prefabricated walls 1 is tightened against each other. In this embodiment, there is an insertion cavity 4 between any two adjacent prefabricated walls 1, and an expansion component 3 is inserted in each insertion cavity 4. Of course, it should be noted that in actual construction, expansion components 3 may also be inserted in only a portion of the insertion cavities 4 as needed.

[0024] In a prefabricated underground continuous wall of the present embodiment, after the prefabricated wall 1 is inserted into the cement soil and before the cement soil solidifies, an expansion member 3 is inserted between two adjacent prefabricated walls 1, and the expansion force provided by the expansion member 3 is used to open the two adjacent prefabricated walls 1 until the interlocking structures 2 between the two adjacent prefabricated walls 1 are mutually tightened. In the prefabricated underground continuous wall, any two adjacent prefabricated walls 1 are opened by the expansion member 3, so that the interlocking structures 2 between the two adjacent prefabricated walls 1 are mutually tightened. In this way, the prefabricated walls 1 in the prefabricated underground continuous wall are mutually tightened, thereby effectively avoiding loosening of the prefabricated walls 1 and improving the stability and water-stopping effect of the prefabricated underground continuous wall; thus, it can effectively solve the problem that there is a large gap in the interlocking structure 2 between the prefabricated walls 1, which makes it easy for the prefabricated walls 1 to loosen, thereby affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0025] Specific embodiment 2, as Figure 1 , Figure 2 , Figure 3 As shown, a prefabricated underground continuous wall using an expansion member includes an expansion member 3 and a plurality of prefabricated walls 1 distributed in sequence. Any two adjacent prefabricated walls 1 are connected by a bite structure 2. An insertion cavity 4 is provided between any two adjacent prefabricated walls 1. An expansion member 3 is inserted into the insertion cavity 4. The expansion member 3 provides an expansion force to open the two adjacent prefabricated walls 1, so that the bite structure 2 between the two adjacent prefabricated walls 1 is mutually tightened.

[0026] The expansion member 3 includes two expansion elements 3.1, an expansion screw 3.3 and an expansion wedge 3.4. The two expansion elements 3.1 are cross-distributed and hingedly connected by a rotating shaft 3.2. The expansion screw 3.3 is located between the two expansion elements 3.1. One end of the expansion screw 3.3 is connected to the rotating shaft 3.2 and extends radially of the rotating shaft 3.2. A fastening nut 3.5 is provided on the expansion screw 3.3. The expansion wedge 3.4 slides along the expansion screw 3.3. Specifically, the expansion wedge 3.4 is provided with a guide through hole that passes through the upper and lower surfaces of the expansion wedge 3.4, and the expansion screw 3.3 passes through the guide through hole so that the expansion wedge 3.4 slides along the expansion screw 3.3. The expansion wedge 3.4 is located between the two expansion elements 3.1. The expansion wedge 3.4 and the rotating shaft 3.2 are located on the same side of the fastening nut 3.5. When the expansion wedge 3.4 moves along the expansion screw 3.3 toward the rotation shaft 3.2, the expansion wedge 3.4 abuts between the two expansion elements 3.1 to spread the two expansion elements 3.1 apart.

[0027] In this embodiment, there is an insertion cavity 4 between any two adjacent prefabricated walls 1, and an expansion member 3 is inserted into each insertion cavity 4. Of course, it should be noted that in actual construction, expansion members 3 may be inserted into only a portion of the insertion cavities 4 as needed.

[0028] In a prefabricated underground continuous wall of this embodiment, after the prefabricated wall 1 is inserted into the cement soil and before the cement soil solidifies, the expansion member 3 is inserted between two adjacent prefabricated walls 1; then, the fastening nut 3.5 is tightened, and the expansion wedge 3.4 is moved downward along the expansion screw 3.3, and the expansion wedge 3.4 is pressed between the two expansion elements 3.1 to open the two expansion elements 3.1, thereby opening the two adjacent prefabricated walls 1 in the horizontal direction until the interlocking structure 2 between the two adjacent prefabricated walls 1 is mutually tightened. In the prefabricated underground continuous wall, any two adjacent prefabricated walls 1 are opened by the expansion member 3, so that the interlocking structure 2 between the two adjacent prefabricated walls 1 is mutually tightened. In this way, the prefabricated walls 1 in the prefabricated underground continuous wall are tightened against each other, thereby effectively preventing the prefabricated walls 1 from loosening and improving the stability and water-stopping effect of the prefabricated underground continuous wall; thus, it can effectively solve the problem that there are large gaps in the interlocking structure 2 between the current prefabricated walls 1, which makes it easy for the prefabricated walls 1 to loosen, thereby affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0029] In this embodiment, Figure 1As shown, the prefabricated wall 1 is a reinforced concrete wall. The cross section of the prefabricated wall 1 is I-shaped. Both pairs of side walls 1.1 of the prefabricated wall 1 have vertical grooves extending up and down. The vertical grooves between the two prefabricated walls 1 constitute the insertion cavity 4 (herein, the opposite side walls 1.1 of the prefabricated wall 1 refer to the opposite side walls 1.1 located between the prefabricated walls 1). Of course, the expansion member 3 for a prefabricated ground-connected wall of this embodiment is not limited to application on a prefabricated wall 1 with an I-shaped cross section. As long as there is an insertion cavity 4 for inserting the expansion member 3 between two adjacent prefabricated walls 1, the expansion member 3 for a prefabricated ground-connected wall of this embodiment can be used.

[0030] Further, such as Figure 2 As shown, the two opposite sides of the expansion wedge block 3.4 facing the two expansion elements 3.1 are inclined wedge surfaces 3.4.1. In this embodiment, the two inclined wedge surfaces 3.4.1 are symmetrically distributed, and the two inclined wedge surfaces 3.4.1 are distributed in a V shape. In this way, when the expansion wedge block 3.4 moves along the expansion screw 3.3 toward the rotation shaft 3.2, the expansion wedge block 3.4 is pressed against the two expansion elements 3.1 through the inclined wedge surfaces 3.4.1, which is conducive to expanding the two expansion elements 3.1.

[0031] Further, such as Figure 2 As shown, the two cross-distributed expansion elements 3.1 are distributed in an X shape. In this way, when the expansion wedge 3.4 moves along the expansion screw 3.3 toward the rotating shaft 3.2, the upper and lower ends of the two expansion elements 3.1 are both spread apart, and the expansion elements 3.1 can be pressed against the prefabricated wall 1 through the upper and lower ends to spread apart the two adjacent prefabricated walls 1 in the horizontal direction, which is beneficial to spread apart the two adjacent prefabricated walls 1 and improve the stability of the prefabricated wall 1 after being spread apart.

[0032] Further, such as Figure 2 As shown, the expansion element 3.1 is composed of a long steel frame, which includes two parallel main steel plates 3.1.1 and a connecting steel plate 3.1.2 that connects the two main steel plates 3.1.1 into one body, and the connecting steel plate 3.1.2 is welded to the main steel plates 3.1.1. The main steel plates 3.1.1 are perpendicular to the rotating shaft 3.2. Each main steel plate 3.1.1 is provided with an axial hole. The rotating shaft 3.2 passes through each main steel plate 3.1.1 of the two expansion elements 3.1 in sequence. In this way, the stability of the expansion element 3.1 can be ensured, and then the two adjacent prefabricated walls 1 can be reliably propped apart.

[0033] Of course, it should be noted that the expansion element 3.1 can also be made of other steel structures, such as angle steel, square steel, I-beam, H-beam, or other steel structures.

[0034] The expansion element 3.1 is provided with the connecting steel plate 3.1.2 on one side facing the expansion wedge 3.4. Thus, when the expansion wedge 3.4 moves along the expansion screw 3.3 toward the rotation shaft 3.2, the expansion wedge 3.4 will abut against the connecting steel plate 3.1.2 to spread the two expansion elements 3.1 apart.

[0035] Furthermore, one end of the expansion screw 3.3 is connected to the rotating shaft 3.2 by welding. In this way, the expansion screw 3.3 and the rotating shaft 3.2 are easily connected and the connection strength of the expansion screw 3.3 and the rotating shaft 3.2 is ensured.

[0036] The rotating shaft 3.2 is provided with a screw positioning hole, and one end of the expansion screw 3.3 is inserted into the screw positioning hole. In this way, the expansion screw 3.3 can be accurately installed at the specified position of the rotating shaft 3.2, and the installation orientation of the expansion screw 3.3 is guaranteed to be accurate.

[0037] The rotating shaft 3.2 is a hollow rotating shaft 3.2 or a solid rotating shaft 3.2. In this embodiment, the rotating shaft 3.2 is a hollow rotating shaft 3.2.

[0038] Further, such as Figure 2 As shown, there are two fastening nuts 3.5. Of the two fastening nuts 3.5, one fastening nut 3.5 close to the expansion wedge 3.4 is used to push the expansion wedge 3.4 to move and spread the two expansion elements 3.1 apart; the other fastening nut 3.5 is tightened after the interlocking structure 2 between the two adjacent prefabricated walls 1 is mutually tightened, and serves as an anti-loosening device for the fastening nut 3.5 close to the expansion wedge 3.4 to prevent the fastening nut 3.5 from loosening.

[0039] Furthermore, a plurality of preset bolt holes (not shown in the figure) are arranged on the outer side wall 1.2 of the prefabricated wall 1 in order from top to bottom, and preset bolts are connected in the preset bolt holes. In this way, after the subsequent foundation pit excavation, the preset bolt holes on the prefabricated wall 1 can be used to connect the concrete waist beam or steel waist beam of the support system, and can also be used to connect the waterproof material of the basement outer wall.

[0040] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 2, except that: like Figure 1 , Figure 3As shown, the interlocking structure 2 includes a first rigid lock buckle 2.2, a second rigid lock buckle 2.3 and a plurality of embedded bolt assemblies 2.1. The embedded bolt assemblies 2.1 are embedded in the prefabricated wall 1. The first rigid lock buckle 2.2 is locked and fixed to a prefabricated wall 1 by the embedded bolt assemblies 2.1. The second rigid lock buckle 2.3 is locked and fixed to another adjacent prefabricated wall 1 by the embedded bolt assemblies 2.1. The first rigid lock buckle 2.2 is interlocked with the second rigid lock buckle 2.3, so that the two adjacent prefabricated walls 1 are interlocked, thereby limiting the displacement of the prefabricated wall 1 in the length direction and thickness direction of the assembled underground continuous wall.

[0041] The expansion member 3 expands two adjacent prefabricated walls 1 so that the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 of the interlocking structure 2 between the two adjacent prefabricated walls 1 are tightened to each other.

[0042] The prefabricated wall 1 in the prior art is generally a reinforced concrete wall, and the prefabricated walls 1 are connected by plain concrete mortise and tenon joints. Since the underground continuous wall is subjected to relatively complex soil pressure during use, and the plain concrete mortise and tenon joints of the prefabricated reinforced concrete wall are fragile, the load bearing capacity of each prefabricated reinforced concrete wall at the plain concrete mortise and tenon joint is poor, and cracks are easily generated. On the other hand, the plain concrete mortise and tenon joints of the prefabricated reinforced concrete wall are fragile and easily damaged by bumps, and the production mold of the prefabricated reinforced concrete wall is complicated and cumbersome.

[0043] The connection structure of the prefabricated wall 1 of the prefabricated underground continuous wall of this embodiment adopts a rigid lock assembly bite connection. Compared with the plain concrete mortise and tenon joint in the prior art, the rigid lock assembly (the first rigid lock 2.2 and the second rigid lock 2.3) has high strength and is not easy to be damaged. The first rigid lock 2.2 and the second rigid lock 2.3 are connected to the prefabricated wall 1 through the embedded bolt assembly 2.1, and the connection strength is good (the first rigid lock 2.2 and the second rigid lock 2.3 will not crack with the prefabricated wall 1), so it can effectively improve the load bearing capacity of the prefabricated wall 1, so that it can withstand complex soil pressure and actively applied axial force, thereby effectively solving the problem that the prefabricated wall 1 in the prior art is prone to cracking at the plain concrete mortise and tenon joint. At the same time, the surface of the rigid lock is smooth and flat, and it is easy to bite when the prefabricated wall 1 is inserted. The first rigid lock 2.2 and the second rigid lock 2.3 are connected to the prefabricated wall 1 through the embedded bolt assembly 2.1, and the production mold of the prefabricated wall 1 can also be simplified.

[0044] Further, such as Figure 1 , Figure 3As shown, the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 of the same interlocking structure are both two and one-to-one corresponding. The two first rigid lock buckles 2.2 are distributed on both sides of the thickness direction of the prefabricated wall 1, and the second rigid lock buckle 2.3 is distributed on both sides of the thickness direction of the prefabricated wall 1. The insertion cavity 4 is located between the two first rigid locks. In this way, after the expansion member 3 provides an expansion force to open the two adjacent prefabricated walls 1 and the interlocking structure 2 between the two adjacent prefabricated walls 1 is tightened with each other, the two first rigid lock buckles 2.2 of the same interlocking structure are tightened with the corresponding second rigid lock buckle 2.3, which can ensure the stability of the two adjacent prefabricated walls 1. At the same time, the displacement of the prefabricated wall 1 in the length direction and thickness direction of the assembled underground continuous wall can be better limited. The thickness direction of the prefabricated wall 1 is the thickness direction of the assembled underground continuous wall.

[0045] In this embodiment, the two first rigid lock buckles 2.2 of the same bite structure are symmetrically distributed, and the two second rigid lock buckles 2.3 are also symmetrically distributed.

[0046] Furthermore, each prefabricated wall 1 is provided with a plurality of embedded bolt assemblies 2.1 distributed sequentially from top to bottom. The first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 both extend along the height direction of the prefabricated wall 1.

[0047] In one implementation of this embodiment, Figure 3 The embedded bolt assembly 2.1 includes an embedded screw sleeve 2.1.1 and a connecting bolt 2.1.2. The embedded screw sleeve 2.1.1 is embedded in the prefabricated wall 1. The connecting bolt 2.1.2 is connected to the embedded screw sleeve by a thread. The first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 are both provided with connecting holes that match the connecting bolts. The connecting bolt passes through the connecting hole on the first rigid lock buckle 2.2 and is connected to the embedded screw sleeve, and the first rigid lock buckle 2.2 is fixed to the prefabricated wall 1 by locking the connecting bolt. The connecting bolt passes through the connecting hole on the second rigid lock buckle 2.3 and is connected to the embedded screw sleeve, and the second rigid lock buckle 2.3 is fixed to the prefabricated wall 1 by locking the connecting bolt.

[0048] In another implementation of the present embodiment, the embedded bolt assembly 2.1 includes an embedded screw and a fastening nut 3.5 (not shown in the figure). The embedded screw is embedded in the prefabricated wall 1. The fastening nut 3.5 is connected to the embedded screw. The fastening nut 3.5 is located on the outside of the prefabricated wall 1. The first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 are both provided with connecting holes that cooperate with the embedded screw. The embedded screw passes through the connecting hole on the first rigid lock buckle 2.2, and the fastening nut 3.5 cooperates with and locks the embedded screw, thereby fixing the first rigid lock buckle 2.2 to the prefabricated wall 1. The embedded screw passes through the connecting hole on the second rigid lock buckle 2.3, and the fastening nut 3.5 cooperates with and locks the embedded screw, thereby fixing the second rigid lock buckle 2.3 to the prefabricated wall 1.

[0049] Furthermore, the length of the first rigid lock buckle 2.2 is the same as the height of the prefabricated wall 1. The length of the second rigid lock buckle 2.3 is the same as the height of the prefabricated wall 1. In this way, on the one hand, when the prefabricated wall 1 is inserted, it is easy for the rigid lock buckle assembly to bite; on the other hand, the load bearing capacity of the prefabricated wall 1 can be further improved. Of course, it should be noted that the lengths of the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 can be set as needed.

[0050] Furthermore, the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 are both steel lock buckles. The steel lock buckle has high structural strength and is easy to manufacture, and can effectively improve the load bearing capacity of the prefabricated wall 1, so that it can withstand complex soil pressure and actively applied axial force. Of course, it should be noted that the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3 can also be set on other rigid lock buckles, such as aluminum alloy lock buckles, titanium alloy lock buckles and other metal lock buckles.

[0051] In one implementation of this embodiment, Figure 3 As shown, the first rigid lock buckle 2.2 is fixed on the opposite side wall 1.1 of the prefabricated wall 1. The first rigid lock buckle 2.2 includes a first fixing portion 2.2.1 and a first bite portion 2.2.2. The first fixing portion is locked and fixed to the prefabricated wall 1 by the embedded bolt assembly 2.1, and the cross-section of the first bite portion is U-shaped. In this embodiment, the second rigid lock buckle 2.3 is also fixed on the opposite side wall 1.1 of the prefabricated wall 1. The cross-section of the second rigid lock is Z-shaped or U-shaped. The second rigid lock buckle 2.3 is engaged and connected with the first bite portion of the first rigid lock buckle 2.2 to limit the displacement of the prefabricated wall 1 in the length direction and thickness direction of the assembled underground continuous wall. In the text, the opposite side wall 1.1 of the prefabricated wall 1 refers to the opposite side wall 1.1 located between the prefabricated walls 1.

[0052] In another implementation of this embodiment, Figure 4 As shown, the first rigid lock buckle 2.2 is fixed on the outer side wall 1.2 of the prefabricated wall 1, and the cross section of the first rigid lock buckle 2.2 is L-shaped. Herein, the outer side wall 1.2 of the prefabricated wall 1 refers to the two side walls located in the thickness direction of the prefabricated wall 1. In this embodiment, the thickness direction of the prefabricated wall 1 is the thickness direction of the assembled underground continuous wall. The second rigid lock buckle 2.3 is fixed on the opposite side wall 1.1 of the prefabricated wall 1, and the cross section of the second rigid lock is Z-shaped.

[0053] Specific embodiment 4 is a construction method of a prefabricated underground continuous wall using expansion components. The specific structure of the prefabricated underground continuous wall using expansion components in this method refers to specific embodiment 2 or specific embodiment 3.

[0054] A construction method of a prefabricated underground continuous wall using an expansion member comprises the following steps in sequence: Construction of cement soil continuous wall.

[0055] In the pile insertion process, the prefabricated wall bodies 1 are sequentially inserted into the cement-soil continuous wall along the length direction of the cement-soil continuous wall, and any two adjacent prefabricated wall bodies 1 are connected by the interlocking structure 2 .

[0056] An expansion process, before the cement soil of the cement soil continuous wall is solidified, inserting the expansion member 3 into the insertion cavity 4; Next, the two adjacent prefabricated walls 1 are stretched apart by the expansion member 3 until the interlocking structures 2 between the two adjacent prefabricated walls 1 are tightened together. Specifically, first tighten the fastening nut 3.5, move the expansion wedge 3.4 downward along the expansion screw 3.3, and the expansion wedge 3.4 abuts between the two expansion elements 3.1 to stretch the two expansion elements 3.1 apart, thereby stretching the two adjacent prefabricated walls 1 apart in the horizontal direction until the interlocking structures 2 between the two adjacent prefabricated walls 1 are tightened together. The prefabricated walls 1 in the prefabricated underground continuous wall are tightened together, thereby effectively preventing the prefabricated walls 1 from loosening, improving the stability and water-stopping effect of the prefabricated underground continuous wall; thus, it can effectively solve the problem that there is a large gap in the interlocking structure 2 between the prefabricated walls 1, which makes the prefabricated walls 1 easy to loosen, thereby affecting the water-stopping effect of the prefabricated underground continuous wall and causing water leakage.

[0057] Furthermore, after the expansion member 3 props apart the two adjacent prefabricated walls 1 until the interlocking structures 2 between the two adjacent prefabricated walls 1 are mutually tightened, an anti-loosening element is inserted between the gaps of the interlocking structures 2 to prevent the interlocking structures 2 from loosening. Specifically, the anti-loosening element is a steel bar or square steel.

[0058] In one implementation of this embodiment, the anti-loosening element is inserted into the gap between the first rigid lock buckle 2.2 and the second rigid lock buckle 2.3.

[0059] In another implementation of this embodiment, the anti-loosening element is inserted into the gap between the first rigid lock buckle 2.2 and the opposite side wall of the prefabricated wall; or the anti-loosening element is inserted into the gap between the second rigid lock buckle and the opposite side wall of the prefabricated wall.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A prefabricated underground continuous wall using expansion components, comprising a plurality of prefabricated wall bodies (1) distributed in sequence, wherein any two adjacent prefabricated wall bodies (1) are connected by a bite structure (2); characterized in that: It also comprises an expansion component (3), an insertion cavity (4) is provided between any two adjacent prefabricated walls (1), the insertion cavity (4) is provided with an expansion component (3), and the expansion component (3) provides an expansion force to spread apart the two adjacent prefabricated walls (1), so that the interlocking structures (2) between the two adjacent prefabricated walls (1) are mutually tightened.

2. The prefabricated underground continuous wall using expansion elements according to claim 1, characterized in that: The expansion member (3) comprises: Two expansion elements (3.1) arranged crosswise and hingedly connected via a rotating shaft (3.2); An expansion screw (3.3) located between the two expansion elements (3.1), one end of which is connected to the rotating shaft (3.2) and extends radially along the rotating shaft (3.2), and a fastening nut (3.5) is provided on the expansion screw (3.3); An expansion wedge (3.4) sliding along the expansion screw (3.3) is located between the two expansion elements (3.1); when the expansion wedge (3.4) moves along the expansion screw (3.3) toward the rotation axis (3.2), the expansion wedge (3.4) spreads the two expansion elements (3.1).

3. The prefabricated underground continuous wall using expansion elements according to claim 2, characterized in that: The two opposite side surfaces of the expansion wedge block (3.4) facing the two expansion elements (3.1) are inclined wedge surfaces (3.4.1), and the two inclined wedge surfaces (3.4.1) are distributed in a V shape.

4. The prefabricated underground continuous wall using expansion elements according to claim 2 or 3, characterized in that: There are two fastening nuts (3.5), and the two fastening nuts (3.5) are located on the same side of the expansion wedge (3.4).

5. The prefabricated underground continuous wall using expansion elements according to claim 1, 2 or 3, characterized in that: The bite structure (2) comprises: The embedded bolt assembly (2.1) is embedded in the prefabricated wall (1); A first rigid lock buckle (2.2) is locked and fixed on a prefabricated wall (1) via a pre-embedded bolt assembly (2.1); The second rigid lock buckle (2.3) is locked and fixed to another adjacent prefabricated wall (1) through the embedded bolt assembly (2.1), and the first rigid lock buckle (2.2) and the second rigid lock buckle (2.3) are engaged and connected, so that the two adjacent prefabricated walls (1) are engaged and connected.

6. The prefabricated underground continuous wall using expansion elements according to claim 5, characterized in that: The first rigid lock buckles (2.2) and the second rigid lock buckles (2.3) of the same engaging structure are both two and correspond one to one, the two first rigid lock buckles are distributed on both sides of the thickness direction of the prefabricated wall (1), the second rigid lock buckles (2.3) are distributed on both sides of the thickness direction of the prefabricated wall (1), and the insertion cavity (4) is located between the two first rigid lock buckles.

7. The prefabricated underground continuous wall using expansion elements according to claim 1, 2 or 3, characterized in that: The cross section of the prefabricated wall (1) is in an I-shape, and both pairs of side walls of the prefabricated wall (1) are provided with vertical grooves extending up and down, and the vertical groove between the two prefabricated walls (1) constitutes the insertion cavity (4).

8. The prefabricated underground continuous wall using expansion elements according to claim 1, 2 or 3, characterized in that: The outer side wall of the prefabricated wall (1) is also provided with a plurality of preset bolt holes distributed in sequence from top to bottom, and preset bolts are connected in the preset bolt holes.

9. A construction method of a prefabricated underground continuous wall using expansion components according to any one of claims 1 to 8, characterized in that: The following steps are involved: Construction of cement soil continuous wall; A pile insertion process, in which the prefabricated wall bodies (1) are sequentially inserted into the cement soil continuous wall along the length direction of the cement soil continuous wall, and any two adjacent prefabricated wall bodies (1) are connected via a bite structure (2); In the expansion process, before the cement soil of the cement soil continuous wall solidifies, the expansion component (3) is inserted into the insertion cavity (4), and then the two adjacent prefabricated walls (1) are stretched apart by the expansion component (3) until the interlocking structures (2) between the two adjacent prefabricated walls (1) are mutually tightened.

10. The construction method of a prefabricated underground continuous wall using expansion elements according to claim 9, characterized in that: The following steps are also included: After the expansion process is completed, anti-loosening elements are inserted between the gaps of the bite structure to prevent the bite structure from loosening.

Images