CN115387326A - Bending bolt connection type prefabricated underground continuous wall - Google Patents

Abstract

The invention discloses a prefabricated underground continuous wall connected by curved bolts. Bolted prefabricated underground diaphragm walls. It includes the lower prefabricated underground diaphragm wall, the upper prefabricated underground diaphragm wall and a vertical connection system, the vertical connection system includes a curved bolt connection device for connecting the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall, The curved bolt connection device includes a curved bolt, a curved bolt lower passage arranged on the upper part of the lower prefabricated underground diaphragm wall and a curved bolt upper passage arranged at the lower part of the upper prefabricated underground diaphragm wall, and the curved bolt passes through the curved bolt lower passage and the curved bolt upper passage And the lower prefabricated underground diaphragm wall is integrated with the upper prefabricated underground diaphragm wall.

Description

Bending Bolt-Connected Prefabricated Underground Diaphragm Wall

technical field

The invention relates to an underground continuous wall, in particular to a prefabricated underground continuous wall connected by bent bolts.

Background technique

The underground diaphragm wall is widely used in soft soil foundation pit enclosure engineering because of its advantages of high overall rigidity and good water sealing effect. The traditional cast-in-place underground diaphragm wall is affected by factors such as long construction time and underwater concrete pouring, which are prone to problems such as underwater concrete inclusions, concrete pipe plugging and broken walls, joints inclusions and leakage, and the position of pre-embedded reinforcement is difficult to control. adversely affect the project. The prefabricated underground diaphragm wall technology can better solve the above problems. At the same time, it also has the advantages of high strength, factory production, high construction efficiency, saving construction site and environmental protection.

The prefabricated underground diaphragm wall is affected by traffic control, the length of a single prefabricated underground diaphragm wall is often limited, and the actual excavation depth is relatively deep, so it is difficult for a single wall to meet the design requirements. Therefore, it is necessary to vertically connect multiple continuous walls from top to bottom to meet the wall depth design requirements. During the installation of underground diaphragm walls, the strength and impermeability of the connection nodes between underground diaphragm walls are the key elements to be controlled. At present, the vertical connection structure between the upper and lower prefabricated underground diaphragm walls is usually connected by concrete pouring, welding and other methods. The above method has problems such as complicated construction technology, low construction efficiency, site environmental pollution easily caused by concrete pouring, and bending resistance of connecting nodes cannot be guaranteed.

Contents of the invention

The purpose of the present invention is to provide a prefabricated underground continuous wall with curved bolt connection, which has high connection strength, good integrity, convenient construction, can not only improve construction efficiency, but also meet the requirements of bending resistance and shear resistance of the wall body.

Technical scheme of the present invention is:

A prefabricated underground diaphragm wall connected by bent bolts, comprising a lower prefabricated underground diaphragm wall, an upper prefabricated underground diaphragm wall and a vertical connection system, and the vertical connection system includes a The curved bolt connection device of the prefabricated underground diaphragm wall, the curved bolt connection device includes a curved bolt, a curved bolt lower passage arranged on the upper part of the lower prefabricated underground diaphragm wall and a curved bolt upper passage arranged on the lower part of the upper prefabricated underground diaphragm wall, the curved bolt The upper end of the bolt lower passage communicates with the upper surface of the lower prefabricated underground diaphragm wall, the lower end of the bent bolt lower passage communicates with the outer surface of the lower prefabricated underground diaphragm wall, and the lower end of the bent bolt upper passage communicates with the upper prefabricated underground continuous wall. The lower end surface of the wall is connected, and the upper end of the upper channel of the curved bolt is connected with the outer surface of the upper prefabricated underground diaphragm wall. A series of prefabricated underground continuous walls are connected as a whole.

Compared with the vertical connection structure between the upper and lower prefabricated underground diaphragm walls in the prior art through concrete pouring, welding, etc., the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall of this scheme are connected by bent bolts Specifically, after the upper prefabricated underground diaphragm wall is hoisted to the top of the lower prefabricated underground diaphragm wall, the lower prefabricated underground diaphragm wall and the upper prefabricated diaphragm wall are connected to the upper prefabricated diaphragm wall through the curved bolt through the curved bolt lower passage and the curved bolt upper passage. The prefabricated underground diaphragm wall is connected as a whole, which has high connection strength, good integrity, and convenient construction, which can not only improve construction efficiency, but also meet the bending and shearing requirements of the wall.

As a preference, the middle part of the upper end surface of the lower prefabricated underground continuous wall is provided with a lower wall tenon, the middle part of the lower end surface of the upper prefabricated underground continuous wall is provided with an upper wall tenon groove, and the lower wall tenon is arranged on the upper wall tenon in the slot. The tenon and groove of the upper wall and the tenon of the lower wall can be occlusally connected, which effectively improves the ability of the underground continuous wall to resist relative displacement in the horizontal direction.

Preferably, there are several bent bolt connecting devices, and each bent bolt connecting device is distributed in two rows, and the two rows of bent bolt connecting devices are distributed on opposite sides of the tenon of the lower wall. In this way, it can effectively ensure that the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall are connected as a whole through the curved bolt connection device without affecting the layout of the tenon of the lower wall, the tenon and groove of the upper wall and the bent bolt connection device .

Preferably, the vertical connection system further includes a screw lock device, the screw lock device includes a pre-embedded lower screw lock assembly and a pre-embedded upper screw lock assembly,

The pre-embedded upper screw lock assembly is pre-embedded on the inner top surface of the upper wall mortise. The pre-embedded upper screw lock assembly includes a plug-in rod, which is located in the upper wall mortise. The lower end of the plug-in rod is provided with a clip connector;

The pre-embedded lower screw lock assembly includes the lower fixing cylinder pre-embedded on the top surface of the tenon of the lower wall, the limit cylinder fixed in the lower fixing cylinder, the snap ring and the lower spring arranged in the lower fixing cylinder, the lower fixing The lower end of the cylinder is closed, the upper end of the lower fixed cylinder is open, the inner hole of the limit cylinder forms a limit insertion hole for matching with the insertion rod, and the lower end of the limit insertion hole is a circle whose inner diameter gradually increases from top to bottom The snap ring guides the cavity, the snap ring is pressed against the inner wall of the snap ring guide cavity under the action of the lower spring, the insertion rod is inserted in the limit insertion hole, the snap ring clamps the snap joint, to prevent the rod from moving upwards.

The screw lock device of this scheme can cooperate with the curved bolt connection device to connect the lower prefabricated underground diaphragm wall with the upper prefabricated underground diaphragm wall as a whole. When installing the wall, insert the insertion rod of the pre-embedded screw lock assembly pre-embedded on the upper prefabricated underground continuous wall into the limit insertion hole pre-embedded in the limit tube on the lower prefabricated underground continuous wall, so that Further improve the bending resistance and shear resistance requirements of the wall; at the same time, the clamping joint is clamped by the snap ring to prevent the insertion rod from moving upwards, so as to realize the preliminary connection of the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall. Then, the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall are connected as a whole through bent bolts to further ensure that the connection strength between the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall is high and the integrity is good. At the same time, its construction is convenient, which can not only improve construction efficiency, but also meet the bending and shearing requirements of the wall. In addition, the combination of the screw lock device and the bent bolt connection device can effectively make up for the defects of the two methods, significantly improve the strength and reliability of the connection, and avoid the continuous underground due to the failure of one connection method. The connection part of the wall breaks, causing adverse effects on the project.

Preferably, the pre-embedded upper screw lock assembly also includes an upper guide cylinder pre-embedded on the inner top surface of the mortise of the upper wall, a sliding column sliding along the upper guide cylinder, and an upper spring located above the sliding column. The upper and lower ends of the cylinder are closed, and the lower end of the upper guide cylinder is provided with an insertion rod through hole, the sliding column is pressed against the lower end of the upper guide cylinder under the action of the upper spring, and the insertion rod is fixedly arranged at the lower end of the sliding column . Due to the heavy weight of the upper prefabricated underground diaphragm wall, the insertion rod is located in the tongue and groove of the upper wall. During the hoisting process of the upper prefabricated underground diaphragm wall, it is difficult for the operator to effectively observe the insertion rod of the pre-embedded upper screw lock assembly. , making it difficult to align the inserting rod of the pre-embedded upper screw lock assembly with the limit insertion hole of the pre-embedded lower screw lock assembly. In the actual operation process, it is easy to happen that the insertion rod of the pre-embedded screw lock assembly is not aligned with the limit insertion hole, so that the insertion rod of the pre-embedded upper screw lock assembly is against the top surface of the tenon of the lower wall, resulting in the pre-embedded upper screw lock assembly. destroyed. In order to solve this problem, this plan improves the pre-embedded upper screw lock assembly. During the process of hoisting the upper prefabricated underground continuous wall, if the insertion rod is not aligned with the limit insertion hole, the pre-embedded upper When the insertion rod of the screw lock assembly touches the top surface of the tenon of the lower wall, the sliding column will overcome the force of the upper spring, so that the insertion rod and the sliding column move upwards into the upper guide cylinder, thereby avoiding pre-embedded screw locks Problems with broken components.

As preferably, both the bent bolt lower passage and the bent bolt upper passage are counterbore holes, the lower end of the bent bolt lower passage has a stepped hole for accommodating the head of the bent bolt or the nut, and the upper end of the bent bolt upper passage has a hole for accommodating the bent bolt. The head of the bent bolt or the stepped hole of the nut, the head of the bent bolt is accommodated in the stepped hole at the upper end of the upper channel of the bent bolt or in the stepped hole at the lower end of the lower channel of the bent bolt, and the nut on the bent bolt is accommodated in the stepped hole at the upper end of the bent bolt upper channel. In the stepped hole at the lower end of the bolt lower channel or in the stepped hole at the upper end of the bent bolt upper channel. In this way, it is ensured that the heads and nuts of the bent bolts are accommodated in the stepped holes, which is beneficial for the upper prefabricated underground diaphragm wall to be inserted into the underground soil layer.

Preferably, the upper channel of the bent bolt is arc-shaped, and the lower channel of the bent bolt is also arc-shaped.

As a preference, an annular sealing strip is provided between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end surface of the lower prefabricated underground diaphragm wall, and the annular sealing adhesive strip extends along the edge of the upper end surface of the lower prefabricated underground diaphragm wall, so The upper end of the lower channel of the curved bolt and the lower end of the upper channel of the curved bolt are located on the inner side of the annular sealing strip, and the lower part of the outer wall of the upper prefabricated underground continuous wall is also provided with a grouting channel, and the lower end of the grouting channel is continuous with the upper prefabricated underground wall. The lower end faces of the walls are connected, and the lower end of the grouting channel is located inside the annular sealing strip, and the grouting channel is used to inject high-strength grouting material between the lower end face of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall within the gap.

In this way, after the upper prefabricated underground diaphragm wall is hoisted to the lower prefabricated underground diaphragm wall, high-strength grouting material can be injected between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end surface of the lower prefabricated underground diaphragm wall through the grouting channel , the setting of the annular sealing rubber strip can avoid the seepage of high-strength grouting material, so that the gap between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall is filled with high-strength grouting material; The integrity of the underground diaphragm wall and the strength of the connection between the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall. At the same time, the water-tight performance of the joint between the upper and lower prefabricated underground diaphragm walls is improved to meet the requirements of anti-seepage and water-proof.

Preferably, the gap between the lower end surface of the upper prefabricated underground continuous wall and the upper end surface of the lower prefabricated underground continuous wall is filled with high-strength grouting material.

Preferably, both the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall are provided with reinforcing cages, and the reinforcing cages include vertical bars and horizontal bars. The reinforcement cage includes vertical reinforcement and horizontal reinforcement to improve the strength of the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall.

The beneficial effects of the invention are: it has the characteristics of high connection strength, good integrity and convenient construction, which can not only improve the construction efficiency, but also meet the requirements of bending resistance and shear resistance of the wall body.

Description of drawings

Fig. 1 is a schematic diagram of a partial structure of the curved bolt-connected prefabricated underground diaphragm wall of the present invention after the upper and lower prefabricated underground diaphragm walls are assembled.

Fig. 2 is a schematic diagram of a partial structure of the curved bolt-connected prefabricated underground diaphragm wall before the upper and lower prefabricated underground diaphragm walls are assembled.

Fig. 3 is a partial structural diagram of the pre-embedded lower screw lock assembly and the pre-embedded upper screw lock assembly of the screw lock device of the bent bolt connection type prefabricated underground continuous wall of the present invention before assembly.

Fig. 4 is a partially enlarged view of A in Fig. 1 .

In the picture:

The lower prefabricated underground diaphragm wall 1, the lower wall tenons 1.1;

Upper prefabricated underground diaphragm wall 2, upper wall tenon and groove 2.1;

Bend bolt connection device 3, bend bolt 3.1, bend bolt lower passage 3.2, bend bolt upper passage 3.3;

Screw lock device 4, pre-embedded upper screw lock assembly 4.0a, pre-embedded lower screw lock assembly 4.0b, upper guide cylinder 4.1, inserting rod 4.2, clip joint 4.3, lower fixing cylinder 4.4, lower spring 4.5, limit cylinder 4.6 , snap ring 4.7, annular pressure piece 4.8, upper prestressed anchor rib 4.9, lower prestressed anchor rib 4.10, annular snap groove 4.11, sliding column 4.12, upper spring 4.13, limit insertion hole 4.14, snap ring guide cavity 4.15, embedded pipe 4.16;

Ring sealing strip 5.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Specific embodiment 1: As shown in Fig. 1 and Fig. 2, a prefabricated underground diaphragm wall connected by bent bolts includes a lower prefabricated underground diaphragm wall 1, an upper prefabricated underground diaphragm wall 2 and a vertical connection system. The above prefabricated underground diaphragm wall is a solid prefabricated underground diaphragm wall or a hollow prefabricated underground diaphragm wall. The next prefabricated underground diaphragm wall is a solid prefabricated underground diaphragm wall or a hollow prefabricated underground diaphragm wall. Both the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall are provided with reinforcement cages, and the reinforcement cages include vertical reinforcement and horizontal reinforcement. The vertical connection system includes a curved bolt connection device 3 for connecting the lower prefabricated underground continuous wall and the upper prefabricated underground continuous wall. The curved bolt connection device 3 includes a curved bolt 3.1, a curved bolt lower passage 3.2 arranged on the upper part of the lower prefabricated underground diaphragm wall and a curved bolt upper passage 3.3 arranged on the lower part of the upper prefabricated underground diaphragm wall. The upper channel of the bent bolt is arc-shaped, and the lower channel of the bent bolt is also arc-shaped. The upper end of the lower channel of the bent bolt communicates with the upper end surface of the lower prefabricated underground diaphragm wall, and the lower end of the lower channel of the bent bolt communicates with the outer surface of the lower prefabricated underground diaphragm wall. The lower end of the upper channel of the bent bolt communicates with the lower end surface of the upper prefabricated underground diaphragm wall, and the upper end of the upper channel of the bent bolt communicates with the outer surface of the upper prefabricated underground diaphragm wall. The bent bolt passes through the lower passage of the bent bolt and the upper passage of the bent bolt and connects the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall as a whole.

Compared with the vertical connection structure between the upper and lower prefabricated underground diaphragm walls in the prior art through concrete pouring, welding, etc., the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall of this scheme are connected by bent bolts Specifically, after the upper prefabricated underground diaphragm wall is hoisted to the top of the lower prefabricated underground diaphragm wall, the lower prefabricated underground diaphragm wall and the upper prefabricated diaphragm wall are connected to the upper prefabricated diaphragm wall through the curved bolt through the curved bolt lower passage and the curved bolt upper passage. The prefabricated underground diaphragm wall is connected as a whole, which has high connection strength, good integrity, and convenient construction, which can not only improve construction efficiency, but also meet the bending and shearing requirements of the wall.

Further, as shown in Figure 1 and Figure 2, the lower channel 3.2 of the bent bolt and the upper channel of the bent bolt are counterbore holes, and the lower end of the lower channel of the bent bolt has a stepped hole for accommodating the head or nut of the bent bolt. The upper end of the upper channel 3.3 of the bent bolt has a stepped hole for receiving the head of the bent bolt or a nut. The head of the bent bolt is accommodated in the stepped hole at the upper end of the upper channel of the bent bolt or in the stepped hole at the lower end of the lower channel of the bent bolt. In this embodiment, the head of the bent bolt is accommodated in the upper end of the upper channel of the bent bolt. stepped hole. The nut on the bent bolt is accommodated in the stepped hole at the lower end of the lower passage of the bent bolt or in the stepped hole at the upper end of the upper passage of the bent bolt. In this embodiment, the nut on the bent bolt is accommodated in the lower end of the lower passage of the bent bolt inside the stepped hole. In this way, it is ensured that the heads and nuts of the bent bolts are accommodated in the stepped holes, which is beneficial for the upper prefabricated underground diaphragm wall to be inserted into the underground soil layer.

Further, as shown in Fig. 1 and Fig. 2, the middle part of the upper end surface of the lower prefabricated underground diaphragm wall is provided with a lower wall tenon 1.1, and the middle part of the lower end face of the upper prefabricated underground diaphragm wall is provided with an upper wall tenon groove 1.2. The wall tenon is arranged in the tenon groove of the upper wall. The tenon and groove of the upper wall and the tenon of the lower wall can be occlusally connected, which effectively improves the ability of the underground continuous wall to resist relative displacement in the horizontal direction. In this embodiment, the cross section of the tenon of the lower wall is rectangular or trapezoidal, and the cross section of the tenon of the upper wall is correspondingly rectangular or trapezoidal.

Further, as shown in Fig. 1 and Fig. 2, there are several bent bolt connecting devices 3, and each bent bolt connecting device is distributed in two rows, and the two rows of bent bolt connecting devices are distributed on opposite sides of the tenon of the lower wall. In this way, it can effectively ensure that the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall are connected as a whole through the curved bolt connection device without affecting the layout of the tenon of the lower wall, the tenon and groove of the upper wall and the bent bolt connection device .

Further, as shown in Figure 1 and Figure 2, an annular sealing rubber strip 5 is provided between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end surface of the lower prefabricated underground diaphragm wall, and the annular sealing rubber strip is along the lower prefabricated underground diaphragm wall. The edge of the upper face of the continuous wall extends. Both the upper end of the lower channel of the bent bolt and the lower end of the upper channel of the bent bolt are located on the inner side of the annular sealing rubber strip. The lower part of the outer wall of the upper prefabricated underground diaphragm wall is also provided with a grouting channel, and the lower end of the grouting channel communicates with the lower end surface of the upper prefabricated underground diaphragm wall, and the lower end of the grouting channel is located inside the annular sealing strip. The tenon of the lower wall is located on the inner side of the ring seal. The grouting channel is used to inject high-strength grouting material into the gap between the lower end surface of the upper prefabricated underground continuous wall and the upper end surface of the lower prefabricated underground continuous wall. The gap between the lower end face of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall is filled with high-strength grouting material. In this way, after the upper prefabricated underground diaphragm wall is hoisted to the lower prefabricated underground diaphragm wall, high-strength grouting material can be injected between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end surface of the lower prefabricated underground diaphragm wall through the grouting channel , the setting of the annular sealing rubber strip can avoid the seepage of high-strength grouting material, so that the gap between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall is filled with high-strength grouting material; The integrity of the underground diaphragm wall and the strength of the connection between the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall. At the same time, the water-tight performance of the joint between the upper and lower prefabricated underground diaphragm walls is improved to meet the requirements of anti-seepage and water-proof.

Specific embodiment two: the remaining structure of this embodiment refers to specific embodiment one, and its difference is,

As shown in FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the vertical connection system also includes a screw lock device 4 . The screw lock device 4 includes a pre-embedded lower screw lock assembly 4.0b and a pre-embedded upper screw lock assembly 4.0a. The pre-embedded upper screw lock assembly is pre-embedded on the inner top surface of the tongue and groove of the upper wall. The pre-embedded screw lock assembly includes insertion rods 4.2, and in this embodiment, the insertion rods are vertically distributed. The insertion rod is located in the tongue and groove of the upper wall, and the lower end of the insertion rod is provided with a clip joint 4.3. The pre-embedded lower screw lock assembly includes the lower fixed cylinder 4.4 pre-embedded on the top surface of the lower wall tenon, the limit cylinder 4.6 fixedly arranged in the lower fixed cylinder, the snap ring 4.7 and the lower spring 4.5 arranged in the lower fixed cylinder. In this embodiment, the lower fixing cylinders are distributed vertically. The lower end of the lower fixing cylinder is closed, and the upper end of the lower fixing cylinder is open. The inner hole of the limit cylinder forms a limit insertion hole 4.14 for cooperating with the insertion rod, and the limit insertion holes are vertically distributed. The lower end of the limit insertion hole is a clasp guide cavity 4.15 whose inner diameter gradually increases from top to bottom. The snap ring moves upward under the action of the lower spring and abuts against the inner wall of the snap ring guide cavity. The insertion rod is inserted in the limit insertion hole. The snap ring clamps the snap connector to prevent the insertion rod from moving upwards.

The screw lock device of this embodiment can cooperate with the curved bolt connection device to connect the lower prefabricated underground continuous wall with the upper prefabricated underground continuous wall. Specifically, after the lower prefabricated underground continuous wall is installed, the upper prefabricated underground continuous wall For the continuous wall, insert the insertion rod of the pre-embedded screw lock assembly pre-embedded on the upper prefabricated underground continuous wall into the limit insertion hole pre-embedded in the limit tube on the lower prefabricated underground continuous wall, so , to further improve the bending resistance and shear resistance requirements of the wall; at the same time, the clamping joint is clamped by the snap ring to prevent the insertion rod from moving upwards, so as to realize the preliminary connection between the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall Then, the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall are connected as a whole through bent bolts, so as to further ensure that the connection strength between the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall is high and the integrity is good , At the same time, its construction is convenient, which can not only improve construction efficiency, but also meet the requirements of bending and shearing resistance of the wall. In addition, the combination of the screw lock device and the bent bolt connection device can effectively make up for the defects of the two methods, significantly improve the strength and reliability of the connection, and avoid the continuous underground due to the failure of one connection method. The connection part of the wall breaks, causing adverse effects on the project.

Specifically, the snap ring 4.7 includes several snap blocks of the same shape and size, and each snap block is evenly distributed along the axis of the limiting cylinder and encloses to form a snap ring. The number of locking blocks is 2 or 3 or 4 or 5 or more. In this embodiment, the number of locking blocks is 3. The outer wall of the locking block matches the inner wall of the guide cavity of the snap ring. The inner wall of the locking block is provided with locking teeth for increasing the friction between the locking block and the locking joint. In this embodiment, the pre-embedded lower screw lock assembly further includes an annular pressing piece 4.8, and the annular pressing piece is located between the lower spring and the snap ring. The lower end of the lower spring abuts against the lower end of the lower fixing cylinder, and the upper end of the lower spring abuts against the annular pressure piece. Under the action of the lower spring, the annular pressing piece presses the snap ring upwards against the inner wall of the snap ring guide cavity.

The card joint can pass through the limit insertion hole. The outer diameter of the card joint first increases and then decreases from bottom to top. The joint between the lower end of the insertion rod and the snap joint forms an annular snap slot 4.11 for matching with the snap ring. The inner wall of the annular clamping groove is conical, and the outer diameter of the inner wall of the annular clamping groove decreases gradually from bottom to top. In this way, in the process of hoisting the upper prefabricated underground continuous wall, it is beneficial to insert the insertion rod into the limit insertion hole, and make the snap ring clamp the snap joint, so as to prevent the insertion rod from moving upward.

In the process of hoisting the upper prefabricated underground diaphragm wall, the insertion rod is inserted downward into the limit insertion hole. In the process of inserting the insertion rod downward into the limit insertion hole, when the snap joint is against the snap ring, the snap joint overcomes the action of the lower spring and guides the snap ring down along the inner wall of the snap ring guide cavity Press, so that the snap ring blocks are opened along the inner wall of the snap ring guide cavity, when the snap ring is matched with the ring snap groove, each snap block of the snap ring is guided along the snap ring cavity under the action of the lower spring The inner wall of the snap ring moves up, and the snap ring blocks are abutted against the inner wall of the annular snap slot; thus the snap joint is clamped by the snap ring to prevent the insertion rod from moving upward.

In this embodiment, there are multiple screw locking devices. Each screw locking device is arranged in 2 rows. Each row of screw lock devices includes several screw lock devices equidistantly distributed along the length direction of the tenons of the lower wall.

Further, as shown in Figure 4, the upper end of the upper guide cylinder is provided with an upper prestressed anchor bar 4.9. In this way, the stability of the pre-embedded upper screw lock assembly pre-embedded in the upper prefabricated underground continuous wall can be improved. The lower end of the lower fixing cylinder is provided with a lower prestressed anchor bar 4.10. In this way, the stability of the pre-embedded lower screw lock assembly pre-embedded in the upper prefabricated underground continuous wall can be improved.

The inner wall of the lower fixing cylinder is provided with internal threads, the outer wall of the limiting cylinder is provided with external threads, and the limiting cylinder and the lower fixing cylinder are connected through threads. In this way, the installation and disassembly of the limiting cylinder is facilitated, and at the same time, it is also convenient to adjust the installation height of the limiting cylinder on the lower fixed cylinder.

Further, as shown in Figure 1, Figure 2, Figure 3, and Figure 4, each pre-embedded upper screw lock assembly also includes an upper guide cylinder 4.1 pre-embedded on the lower end surface of the upper prefabricated underground continuous wall, and an upper guide cylinder Sliding sliding post 4.12 and upper spring 4.13 positioned above the sliding post. The upper and lower ends of the upper guide cylinder are closed, and the lower end of the upper guide cylinder is provided with an insertion rod through hole. The sliding column is pressed against the lower end of the upper guide cylinder under the action of the upper spring. The insertion rod 4.2 is fixedly arranged at the lower end of the sliding column. In this embodiment, the downward pressing force of the upper spring acting on the sliding post is greater than the upward pressing force of the lower spring acting on the annular pressing piece. Due to the heavy weight of the upper prefabricated underground diaphragm wall, the insertion rod is located in the tongue and groove of the upper wall. During the hoisting process of the upper prefabricated underground diaphragm wall, it is difficult for the operator to effectively observe the insertion rod of the pre-embedded upper screw lock assembly. , making it difficult to align the inserting rod of the pre-embedded upper screw lock assembly with the limit insertion hole of the pre-embedded lower screw lock assembly. In the actual operation process, it is easy to happen that the insertion rod of the pre-embedded screw lock assembly is not aligned with the limit insertion hole, so that the insertion rod of the pre-embedded upper screw lock assembly is against the top surface of the tenon of the lower wall, resulting in the pre-embedded upper screw lock assembly. destroyed. In order to solve this problem, this plan improves the pre-embedded upper screw lock assembly. During the process of hoisting the upper prefabricated underground continuous wall, if the insertion rod is not aligned with the limit insertion hole, the pre-embedded upper When the insertion rod of the screw lock assembly touches the top surface of the tenon of the lower wall, the sliding column will overcome the force of the upper spring, so that the insertion rod and the sliding column move upwards into the upper guide cylinder, thereby avoiding pre-embedded screw locks Problems with broken components.

Further, as shown in Fig. 1 and Fig. 4, the upper guide cylinder in the pre-embedded upper screw lock assembly of one or two screw lock devices in each screw lock device is provided with a pre-embedded pipe 4.16, and the upper guide tube and The sliding column is connected in a sliding and sealed manner, and the cavity above the sliding column in the upper guide cylinder is filled with liquid. One end of the embedded pipe communicates with the upper part of the inner cavity of the upper guide cylinder, and the other end of the embedded pipe communicates with the outer surface of the upper prefabricated underground continuous wall. The other end of the embedded pipe is provided with a rubber sealing plug that can be pulled out. Although the above pre-embedded screw lock assembly can be effectively solved, in the process of hoisting the upper prefabricated underground continuous wall, the embedded screw lock assembly is destroyed because the insertion rod and the limit insertion hole are not aligned; After the upper prefabricated underground diaphragm wall is hoisted to the upper end face of the lower prefabricated underground diaphragm wall, the screw lock device is completely covered, and it is often difficult for the operator to judge whether the insertion rod is inserted into the limit insertion hole. If the rod is not inserted into the limit insertion hole, it will lead to the failure of the offshore Eji between the lower prefabricated underground diaphragm wall and the upper prefabricated underground diaphragm wall. In order to solve this problem, this plan has been improved, and there is a screw lock The device has been improved. During the process of hoisting the upper prefabricated underground continuous wall, if the insertion rod of the screw lock device is not aligned with the limit insertion hole, the insertion rod of the screw lock device will be against the lower prefabricated diaphragm wall. The upper end face of the underground continuous wall, and move the insertion rod and the sliding column upwards into the upper guide cylinder, so that the liquid in the upper guide cylinder is pressed out through the embedded pipe (the liquid automatically pushes the rubber sealing plug), so that, The operator can judge whether the insertion rod of the screw lock device is aligned with the limit insertion hole by whether there is liquid flowing out of the embedded pipe. The limit insertion hole is aligned; if liquid flows out of some embedded pipes, it means that the insertion rod of the screw lock device is not aligned with the limit insertion hole; at this time, the operator needs to re-install the upper prefabricated underground continuous wall. So that the insertion rod of the screw lock device is aligned with the limit insertion hole.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent transformations made to the above embodiments according to the technical essence of the present invention still belong to the technical solution of the present invention. scope of protection.

Claims (10)

1. A curved bolt-connected prefabricated underground diaphragm wall, comprising a lower prefabricated underground diaphragm wall, an upper prefabricated underground diaphragm wall and a vertical connection system, characterized in that the vertical connection system includes a The curved bolt connection device between the underground diaphragm wall and the upper prefabricated underground diaphragm wall, the curved bolt connection device includes a curved bolt, a curved bolt lower passage arranged on the upper part of the lower prefabricated underground diaphragm wall, and a curved bolt arranged at the lower part of the upper prefabricated underground diaphragm wall The upper channel, the upper end of the lower channel of the bent bolt communicates with the upper end surface of the lower prefabricated underground diaphragm wall, the lower end of the lower channel of the bent bolt communicates with the outer surface of the lower prefabricated underground diaphragm wall, and the lower end of the upper channel of the bent bolt It communicates with the lower end surface of the upper prefabricated underground diaphragm wall, and the upper end of the upper channel of the bent bolt communicates with the outer surface of the upper prefabricated underground diaphragm wall. The bent bolt passes through the lower channel of the bent bolt and the upper channel of the bent bolt and connects the lower The prefabricated underground diaphragm wall is integrated with the upper prefabricated underground diaphragm wall. 2. The curved bolt-connected prefabricated underground diaphragm wall according to claim 1, characterized in that, the middle part of the upper end surface of the lower prefabricated underground diaphragm wall is provided with a lower wall tenon, and the upper prefabricated underground diaphragm wall The middle part of the lower end face is provided with a tenon groove of the upper wall, and the tenon of the lower wall is set in the tenon groove of the upper wall. 3. The curved bolt connection type prefabricated underground diaphragm wall according to claim 2, characterized in that, there are several curved bolt connection devices, each curved bolt connection device is distributed in two rows, and the two rows of curved bolt connection devices are distributed On opposite sides of the tenon in the next wall. 4. The curved bolt-connected prefabricated underground continuous wall according to claim 2 or 3, wherein the vertical connection system further includes a screw lock device, and the screw lock device includes a pre-buried lower screw lock assembly and a pre-buried upper screw lock assembly, The pre-embedded upper screw lock assembly is pre-embedded on the inner top surface of the upper wall mortise. The pre-embedded upper screw lock assembly includes a plug-in rod, which is located in the upper wall mortise. The lower end of the plug-in rod is provided with a clip connector; The pre-embedded lower screw lock assembly includes the lower fixing cylinder pre-embedded on the top surface of the tenon of the lower wall, the limit cylinder fixed in the lower fixing cylinder, the snap ring and the lower spring arranged in the lower fixing cylinder, the lower fixing The lower end of the cylinder is closed, the upper end of the lower fixed cylinder is open, the inner hole of the limit cylinder forms a limit insertion hole for matching with the insertion rod, and the lower end of the limit insertion hole is a circle whose inner diameter gradually increases from top to bottom The snap ring guides the cavity, the snap ring is pressed against the inner wall of the snap ring guide cavity under the action of the lower spring, the insertion rod is inserted in the limit insertion hole, the snap ring clamps the snap joint, to prevent the rod from moving upwards. 5. The curved bolt-connected prefabricated underground continuous wall according to claim 4, wherein the pre-embedded upper screw lock assembly also includes an upper guide cylinder pre-embedded on the inner top surface of the mortise of the upper wall, The sliding column that slides along the upper guide cylinder and the upper spring located above the sliding column. The upper and lower ends of the upper guide cylinder are closed, and the lower end of the upper guide cylinder is provided with a plug-in rod through hole. The sliding column acts on the upper spring. It abuts against the lower end of the upper guide cylinder, and the insertion rod is fixedly arranged at the lower end of the sliding column. 6. The curved bolt-connected prefabricated underground continuous wall according to claim 1, 2 or 3, characterized in that, the lower channel of the curved bolt and the upper channel of the curved bolt are counterbore holes, and the lower end of the lower channel of the curved bolt has a The upper end of the upper channel of the bent bolt has a stepped hole for receiving the head of the bent bolt or the nut, and the head of the bent bolt is accommodated in the upper end of the upper channel of the bent bolt. In the stepped hole or in the stepped hole at the lower end of the bent bolt lower channel, the nut on the bent bolt is accommodated in the stepped hole at the lower end of the bent bolt lower channel or in the stepped hole at the upper end of the bent bolt upper channel. 7. The curved bolt-connected prefabricated underground continuous wall according to claim 1, 2 or 3, characterized in that, the upper channel of the curved bolt is arc-shaped, and the channel under the curved bolt is also arc-shaped. 8. The curved bolt-connected prefabricated underground diaphragm wall according to claim 1, 2 or 3, characterized in that, the lower end face of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall There is an annular sealing rubber strip, which extends along the edge of the upper end face of the lower prefabricated underground continuous wall, and the upper end of the lower channel of the bent bolt and the lower end of the upper channel of the bent bolt are both located inside the annular sealing rubber strip. The lower part of the outer wall of the upper prefabricated underground diaphragm wall is also provided with a grouting channel. The grouting material is injected into the gap between the lower end surface of the upper prefabricated underground continuous wall and the upper end surface of the lower prefabricated underground continuous wall. 9. The curved bolt-connected prefabricated underground diaphragm wall according to claim 8, wherein the gap between the lower end surface of the upper prefabricated underground diaphragm wall and the upper end face of the lower prefabricated underground diaphragm wall is made of high-strength grouting material filling. 10. The curved bolt-connected prefabricated underground diaphragm wall according to claim 1, 2 or 3, characterized in that, both the upper prefabricated underground diaphragm wall and the lower prefabricated underground diaphragm wall are provided with reinforcement cages, and the reinforcement cages Including vertical ribs and horizontal ribs.

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