Pipe piece joint structure and connecting method

Abstract

The invention discloses a segment joint structure and a connection method, and solves the problems of complex joint structure and insufficient connection resistance in the prior art by utilizing pushing, pressing, fastening, multi-step limiting and active fault-tolerant connection. The segment joint structure comprises a lock box and a pin rod, a split type wedge block is arranged in the lock box, the split type wedge block is matched with the wedge surface of the lock box, and an elastic piece used for resetting the split type wedge block is arranged on the split type wedge block or in the lock box; and the pin rod is connected with the split wedge block in a tooth groove occlusion manner. According to the duct piece connector structure, the connection safety and the connection strength of the connector are guaranteed through the multi-stage limiting tooth grooves and the groove rings in an embedded mode, the structure is simple, and the machining difficulty is low; the connecting method of the connector is simple and convenient in operation mode and high in fault-tolerant capability, and quick and accurate staggered connection is realized by actively and circumferentially adjusting the position of the pin rod.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to a pipe segment butt joint device. Background Art

[0002] Domestic segment joints are usually bolted, which has problems such as large hand holes and difficult positioning. Bolt joints are moving towards no hand holes during the optimization process, so quick joints have emerged. Quick joints are mainly friction type and limit type. The friction type quick joint is fastened by forming pressure between the two components and then forming friction through the rough surface; the limit type quick joint is fastened by the expansion of the insertion end of the wedge limit pin in the lock box. The relevant technologies are as follows: Friction type joints, such as a pipe segment joint and a method for connecting pipe segment joints with patent publication number CN106351672A; the structural processing precision requirements are high, the structure is complex, there is no internal fault tolerance, and the connection resistance is less than the structure's own resistance. Limit type joints, such as a pipe segment socket connector with patent publication number CN112943297A; the mechanism is cumbersome, there is no internal fault tolerance, and the connection resistance is small. Limit type joints, such as a ring-shaped combined shield tunnel pipe segment annular seam connection device with patent publication number CN115539083A; it only relies on the retraction force of the elastic fixing ring to ensure the connection resistance, and the safety and reliability are low.

[0003] In view of the deficiencies in the above-mentioned technology, it is necessary to develop a joint structure with push-tightening multi-stage limit and active fault-tolerant connection and a construction method thereof to solve the problems of complex joint structure and insufficient connection resistance in the prior art. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a pipe segment joint structure and connection method, which utilizes push-tightening multi-stage limit and active fault-tolerant connection to solve the problems of complex joint structure and insufficient connection resistance in the prior art.

[0005] The technical solution of the present invention is implemented as follows: a pipe segment joint structure includes a locking box and a pin rod, a split wedge is provided in the locking box, the split wedge cooperates with the wedge surface of the locking box, an elastic member for resetting the split wedge is provided on the split wedge or in the locking box; the pin rod and the split wedge are connected in a tooth-groove bite manner.

[0006] Further preferably, the split-petal wedge block comprises N split-petal parts, N≥2, and the N split-petal parts form a truncated cone structure with a central hole left inside; a truncated cone cavity corresponding to the truncated cone structure is opened in the lock box, and the depth of the truncated cone cavity is greater than the height of the truncated cone structure; the split-petal wedge block is embedded in the lock box in a state of being wider at the top and narrow at the bottom, forming a stop structure of the lock box for the split-petal wedge block.

[0007] Further preferably, the split wedge block includes two split parts, the two split parts are respectively a left split wedge block and a right split wedge block, the inner diameter of the central channel is consistent with the outer diameter of the pin rod, a multi-step gear ring is provided on the inner wall of the central channel, a multi-step groove ring is provided on the pin rod, the multi-step gear ring and the multi-step groove ring are clamped together to form a tooth-groove bite, and the split wedge block forms a stop structure for the pin rod in a tooth-groove bite manner.

[0008] Further preferably, the multi-step gear ring includes several annular protrusions arranged in parallel, the cross-section of the annular protrusion is an inverted right triangle or an inverted right trapezoid, the plane corresponding to the top edge of the inverted right triangle or the inverted right trapezoid forms a stop surface plane, and the inclined surface corresponding to the hypotenuse of the inverted right triangle or the inverted right trapezoid forms an insertion inclined surface; the multi-step groove ring includes several annular grooves arranged in parallel, the cross-section of the annular grooves is a rectangle or a right triangle or a right trapezoid corresponding to the annular protrusion.

[0009] As a first preferred embodiment, the elastic member is an elastic ring, a positioning groove is provided on the outer wall of the split wedge, and the elastic ring is sleeved on the split wedge and located in the positioning groove. Preferably, the insertion end of the split wedge is provided with an inclined flare to facilitate the rapid alignment of the pin.

[0010] As a second preferred embodiment, the elastic member is an elastic pad, which is embedded in the lock box and arranged axially corresponding to the split-petal wedge. Preferably, the middle part of the pin is provided with an outer ring protrusion, and the outer ring protrusion and the pin are connected by an inclined transition, and the insertion end of the split-petal wedge is provided with an inclined flare, and the inclined surfaces between the outer ring protrusion and the pin correspond to the inclined flare, which facilitates the rapid alignment of the pin and can move the split-petal wedge toward the bottom surface of the inclined groove by pressing down the outer expansion ring, creating a fault-tolerant space for the movement of the pin.

[0011] As the first connection method, the lock box is pre-buried at the corresponding pipe segment joint, and the pin rod is a post-installed component and is inserted into the lock box. This situation is for normal pipe segment assembly.

[0012] As a second connection method, the lock box is pre-buried at the corresponding shaft segment joint, the pin rod is a post-installed part, the pin rod is a long rod and passes through the lock box upward. This situation is for the assembly of shaft segments.

[0013] As the third connection method, the pin rod is connected to the corresponding segment joint through a pre-buried sleeve, and a lock box reserved groove is opened at the segment joint. The lock box is a post-installed part and two split wedges are symmetrically arranged in the lock box. This situation is for the situation that the lock box is not pre-buried during normal segment assembly.

[0014] A connection method for a pipe segment joint structure, S1: a pin rod is aligned with a split wedge block and inserted into a lock box, the pin rod pushes the split wedge block to the bottom surface of the truncated cone cavity in the lock box and spreads the split wedge block, the central channel of the split wedge block is expanded, and the multi-step groove ring on the pin rod and the multi-step gear ring on the central channel are staggered and moved, the pin rod continues to move until the multi-step groove ring and the multi-step gear ring are engaged and connected, the split wedge block rebounds and resets to the locked position under the action of the elastic member, the split wedge block holds the pin rod tightly and can move with the pin rod; S2: When the pin rod needs to be connected to another split wedge, the pin rod is moved to disengage the split wedge from the locking position of the lock box. The closer the split wedge is to the bottom surface of the conical cavity in the lock box, the larger the surplus space between its circumferential side and the lock box. The pin rod is thus moved circumferentially to achieve active circumferential adjustment of the pin rod so as to align it with the other split wedge. Then, the connection between the pin rod and the split wedge is completed according to S1. The connection of the segment joint structure is completed.

[0015] The beneficial effects of the present invention are as follows: the pipe segment joint structure provided by the present invention ensures the safety and strength of the joint connection through the multi-stage limiting tooth groove and the groove ring embedding, has a simple structure and low processing difficulty; the split wedge block cooperates with the elastic member to realize that the split wedge block can be quickly retracted after being stretched open by the pin rod, thereby improving the locking efficiency of the pin rod. The connection method of the joint is simple to operate and has strong fault tolerance. By actively adjusting the position of the pin rod circumferentially, a quick and accurate connection of the misalignment can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the pin rod and the lock box structure; Figure 2 This is a cross-sectional diagram of the lock box structure of Scheme 1; Figure 3 This is a cross-sectional diagram of the split wedge structure of Scheme 1; Figure 4 It is a cross-sectional schematic diagram of the process of inserting the pin rod into the lock box for connection in scheme 1; Figure 5 This is a cross-sectional diagram of the pin rod of Scheme 1 after being inserted into the lock box and connected; Figure 6 It is a cross-sectional schematic diagram of the dislocation connection process of the pipe segments in scheme 1; Figure 7 This is a cross-sectional diagram of the completed connection of the pipe segments in Scheme 1; Figure 8 This is a schematic diagram of the pin rod structure of Scheme 2; Fig. 9 This is a cross-sectional diagram of the lock box structure of Scheme 2; Fig.10 This is a cross-sectional diagram of the pin rod of Scheme 2 inserted into the lock box and connected; Fig.11 This is a cross-sectional diagram of the completed connection of the pipe segments in Scheme 2; Fig.12 This is a cross-sectional diagram of the double-opening lock box and the pin rod connection structure of Scheme 3; Fig.13 This is a schematic diagram of the structural cross-section of the connecting pin rod of the combination lock box of Scheme 4; Fig.14 This is a schematic diagram of the structural cross-section of the combination lock box connecting pin rod in Plan 4. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, embodiment 1 is a pipe segment joint structure, including a lock box 2 and a pin rod 1, and a smooth groove is provided at the end of the pin rod to facilitate its quick insertion. A split wedge 3 is provided in the lock box 2, and the split wedge 3 cooperates with the wedge surface of the lock box 2, and the wedge is stopped by the lock box; an elastic member for resetting the split wedge 3 is provided on the split wedge 3 or in the lock box 2, and the split wedge 3 opens and closes autonomously under the action of the elastic member, which is used to hold the pin rod 1 tightly or not. Under normal conditions, the split wedge 3 is in a locked position in the lock box 2; the pin rod 1 and the split wedge 3 are connected in a tooth-groove bite manner; the pin rod is stopped by the wedge; the structure is simple and the connection is firm.

[0020] In this embodiment, as a preferred solution, the petal-type wedge 3 includes N petal parts, N≥2, and the N petal parts form a truncated cone structure with a central hole inside, and the central hole is used to lock the pin rod. A truncated cone cavity 2-1 corresponding to the truncated cone structure is provided in the lock box 2, forming a wedge surface limit for the petal-type wedge 3. The depth of the truncated cone cavity is greater than the height of the truncated cone structure; when the petal-type wedge 3 reaches the bottom surface of the lock box 2, that is, the bottom surface of the truncated cone cavity 2-1, there is a circumferential space between the petal-type wedge and the cavity wall of the truncated cone cavity, that is, a fault-tolerant space is formed, which is convenient for the petal-type wedge to adjust the circumferential position of the pin rod held tightly by the petal-type wedge, so as to achieve a quick and precise connection with another petal-type wedge, and at the same time facilitate the petal-type wedge 3 to be quickly opened to form a tooth groove bite for the pin rod. The petal-type wedge 3 is embedded in the lock box 2 in a state of being wide at the top and narrow at the bottom, forming a stop structure for the petal-type wedge 3 of the lock box 2. When assembling the pin rod and the split wedge 3, the pin rod first pushes the split wedge 3 to move axially in the lock box 2. When the split wedge contacts the bottom surface of the lock box 2, i.e., the bottom surface of the truncated cone cavity 2-1, the pin rod opens the split wedge 3 and penetrates into the split wedge 3. The split wedge 3 is reset under the action of the elastic member, and the pin rod is locked. The bottom surface of the lock box can be a closed structure integrated with the lock box, or an open structure integrated with the lock box for the pin rod to pass through, or a separate structure combined with the lock box.

[0021] Example 2, a pipe segment joint structure, a locking box is provided with an inclined groove from the inner bottom surface to the outer opening, which is larger inside and smaller outside, and the slope of the inclined surface is consistent with the slope of the wedge block. The space in the groove is larger than the petal wedge block. The space above the inclined groove meets the minimum space for the pin rod to open the petal wedge block and move dislocation. The space below the inclined groove imprisons the petal wedge block to ensure the safety of the joint connection. Figure 2 As shown, the split wedge 3 includes two split parts, which are a left split wedge 3-1 and a right split wedge 3-2. The left split wedge 3-1 and the right split wedge 3-2 form a truncated cone structure. The inner diameter of the central channel is consistent with the outer diameter of the pin rod 1. A multi-step gear ring 31 is provided on the inner wall of the central channel. A multi-step groove ring 11 is provided on the pin rod 1. The multi-step gear ring and the multi-step groove ring are engaged to form a tooth groove bite. The split wedge 3 forms a stop structure for the pin rod 1 in the tooth groove bite mode. A multi-step groove ring is provided on the outer periphery of the pin rod body from top to bottom, which is engaged with the multi-step gear ring on the inner periphery of the split wedge, forming a push-tightening multi-step limiter segment joint structure, thereby improving the reliability of the connection.

[0022] The multi-step gear ring described in this embodiment includes several parallel annular protrusions, the cross-section of the annular protrusion is an inverted right triangle or an inverted right trapezoid, the plane corresponding to the top edge of the inverted right triangle or inverted right trapezoid forms a stop surface plane, and the inclined surface corresponding to the hypotenuse of the inverted right triangle or inverted right trapezoid forms an insertion inclined surface; the multi-step groove ring includes several parallel annular grooves, the cross-section of the annular grooves is a rectangle or a right right triangle or right right trapezoid corresponding to the annular protrusions.

[0023] That is, in order to facilitate the insertion of the pin rod into the lock box, the split wedge structure can be adjusted as follows: ① The upper side of the gear ring section of the split wedge is straight, and the lower side is beveled. The beveled side facilitates the entry of the pin rod, and the straight side and the pin rod groove ring are relative to each other to prevent retreat. ② The narrow surface of the split wedge is provided with a beveled groove, that is, the beveled flare described below is flush with the lock box mouth, so that the pin rod can be inserted into the lock box more easily.

[0024] Also, in order to facilitate the insertion of the pin rod into the lock box, the pin rod structure can be adjusted as follows: ① A smooth groove is provided at the end of the pin rod; ② The insertion side of the outer peripheral groove ring of the pin rod is an inclined surface, and the stop side is a straight surface, thereby reducing the resistance when the pin rod is inserted.

[0025] In order to facilitate the rapid retraction of the split wedge after being stretched open by the pin, two methods are adopted: ① A groove is provided on the outer side of the split wedge to accommodate an elastic ring or elastic rope or elastic ring, which is tightened and retracted by the elastic ring. Specifically, the elastic member is an elastic ring 4, and a positioning groove 32 is provided on the outer wall of the split wedge 3. The elastic ring 4 is sleeved on the split wedge 3 and located in the positioning groove 32.

[0026] ② The gap between the split wedge and the bottom surface of the lock box is filled with an elastic pad, which presses the split wedge and the pin rod back into the inclined groove to ensure the overall movement of the split wedge. Specifically, the elastic member is an elastic pad 5, which is embedded in the lock box 2 and axially corresponds to the split wedge 3.

[0027] In order to enhance the shear resistance of the joint and the operability of the misalignment space in the inclined groove, an outer expansion ring is added in the middle of the pin rod, and the petal wedge can be pressed down by the outer expansion ring to move toward the bottom surface of the inclined groove, creating a fault-tolerant space for the pin rod to move. Specifically, the middle part of the pin rod 1 is provided with an outer ring protrusion 12, and the outer ring protrusion 12 is the above-mentioned outer expansion ring. The outer ring protrusion 12 is connected to the pin rod 1 by an inclined transition, and the insertion end of the petal wedge 3 is provided with an inclined flare, and the inclined surface between the outer ring protrusion 12 and the pin rod 1 corresponds to the inclined flare. The outer ring protrusion 12 is larger than the diameter of the rod body, embedded in the notch in the center of the pin rod, and can contact the petal wedge.

[0028] The connection method of the above-mentioned pipe segment joint structure, S1: when connecting the first pipe segment: the pin rod is aligned with the split wedge block and inserted into the lock box, the pin rod pushes the split wedge block to the bottom surface of the truncated cone cavity in the lock box and spreads the split wedge block, the central channel of the split wedge block is expanded, and the multi-step groove ring on the pin rod and the multi-step gear ring on the central channel are staggered and moved, the pin rod continues to move until the multi-step groove ring and the multi-step gear ring are engaged and connected, the split wedge block rebounds and resets to the locking position under the action of the elastic member, the split wedge block holds the pin rod tightly and can move with the pin rod; S2: When connecting the second segment: When the pin rod needs to connect to another split wedge, move the pin rod to disengage the split wedge from the locking position of the lock box. The closer the split wedge is to the bottom surface of the conical cavity in the lock box, the larger the surplus space between its circumferential side and the lock box. The pin rod is moved circumferentially to achieve active circumferential adjustment of the pin rod so as to align it with the other split wedge. Then complete the connection between the pin rod and the split wedge according to S1. Complete the connection of the segment joint structure.

[0029] like Figure 3 , 4 As shown, Example 3 is a segment joint structure. As a scheme 1, this embodiment is for normal segment assembly, that is, segment assembly and docking in a transverse tunnel. On the theoretical basis of Examples 1 and 2, in this embodiment, the petal wedge 3 includes two petal parts, the two petal parts are the left petal wedge 3-1 and the right petal wedge 3-2, the elastic part is an elastic ring 4, a positioning groove 32 is provided on the outer wall of the petal wedge 3, and the elastic ring 4 is sleeved on the petal wedge 3 and located in the positioning groove 32. The multi-step gear ring includes a number of parallel annular protrusions, the cross section of the annular protrusion is an inverted right triangle, the plane corresponding to the top side of the inverted right triangle forms a stop surface plane, and the inclined surface corresponding to the hypotenuse of the inverted right triangle forms an insertion inclined surface; the multi-step groove ring includes a number of parallel annular grooves, the cross section of the annular groove is a rectangle.

[0030] During specific implementation, the lock box 2 is pre-buried at two corresponding joints of two corresponding pipe segments, that is, the lock box is connected with the anchor and pre-buried in the pipe segment, and the pin rod 1 is a post-installed component and is penetrated in the lock box 2 .

[0031] In this embodiment, the method for butt jointing the pipe segments is as follows: Figures 3 to 6 As shown: S1: The pin rod connects the lock box on one side. When connecting the first segment, the lock box is pre-buried to the designed position of the segment joint through the anchor 20, the pin rod is inserted into the lock box, and the split wedge is pushed to the bottom surface of the lock box and spread open. The central channel of the split wedge is expanded, and the groove ring and gear ring of the pin rod are staggered and moved. The pin rod continues to move forward until the gear rings and groove rings of each step are engaged, and the outer peripheral elastic ring of the split wedge rebounds, and the wedge holds the pin rod tightly and can move with the pin rod.

[0032] S2: The pin rod is actively adjusted to connect. Then the second pipe segment is connected. When the pin rod is connected to the lock box on the other side, the pin rod is moved to lock the split wedge out of the inclined surface of the lock box. The closer the split wedge is to the bottom surface of the lock box, the larger the spare space on its circumference. The pin rod is moved circumferentially to realize active circumferential adjustment of the pin rod. The pin rod position is actively adjusted to align and connect with the lock box on the other side. After the alignment and connection, the lock box on the other side is pushed forward. The connection process refers to S1. After the connection is completed, the sealing gasket is compressed, the pushing force is withdrawn, and the sealing gasket rebounds, driving the split wedge to be embedded in the inclined groove of the lock box, completing the docking of the two pipe segments. A sealing gasket 30 is provided between the butt joints of the pipe segments to further improve the overall sealing of the pipe segments.

[0033] Embodiment 4, a segment joint structure, as the second scheme, this embodiment is for normal segment assembly, that is, segment assembly and docking in a transverse tunnel. Based on the theories of embodiments 1 and 2, this embodiment is different from embodiment 3 in that this embodiment adopts the second elastic member structure; that is, the elastic ring and the corresponding groove are removed, and an elastic pad is added in the gap between the split wedge and the bottom surface of the inclined groove to ensure that the wedge can also return to the embedded inclined groove under the action of the elastic pad, and the elastic pad can also ensure the overall up and down movement of the split wedge. The pin rod is composed of a rod body and an outer expansion ring. The pin rod is provided with a groove ring from the end to the middle of the rod body. The groove ring is symmetrical along the center of the rod body. A notch is provided in the center of the rod body, and an outer expansion ring is provided inside. The outer expansion ring is annular, and the inner ring is embedded in the center of the pin rod. The outer ring is larger than the diameter of the rod body and can contact the split wedge. The fault-tolerant operation is that the pin rod drives the outer expansion ring to press the split wedge back, the split wedge compresses the elastic pad, and a fault-tolerant space appears around the split wedge, and the pin rod moves a certain distance around the circle. During the connection process, the elastic pad back-presses the split wedge and the pin rod, and after the connection, the sealing pad requires no or little rebound capacity.

[0034] In this embodiment, the method for butt jointing the pipe segments is as follows: Figures 8 to 11 As shown: S1: The pin rod connects the lock box on one side. When connecting the first segment, the lock box is pre-buried to the designed position of the segment joint through the anchor, the pin rod is inserted into the lock box, and the split wedge is pushed to the bottom surface of the lock box and spread open. The central channel of the split wedge is enlarged, and the groove ring and gear ring of the pin rod are staggered and moved. The pin rod continues to move forward until the gear rings and groove rings of each step are engaged. Under the action of the elastic pad, the split wedge moves toward the small end of the truncated cone cavity of the lock box, and the split wedge gradually returns to its position until the wedge holds the pin rod tightly and can move with the pin rod.

[0035] S2: The pin rod is actively adjusted to connect. Then the second pipe segment is connected. When the pin rod is connected to the lock box on the other side, the pin rod is moved to push the split wedge block toward the large end of the truncated cone cavity of the lock box, and gradually separate from the wedge surface of the lock box. The closer the split wedge block is to the inner bottom surface of the lock box, the larger the surplus space on its circumference, so the pin rod is moved on the circumference to realize the active circumferential adjustment of the pin rod, and the pin rod position is actively adjusted to align and connect with the lock box on the other side. After the alignment and connection, the lock box on the other side is pushed forward. The connection process refers to S1. After the connection is completed, the sealing gasket is compressed, the propulsion force is withdrawn, and the sealing gasket rebounds, driving the split wedge block to be embedded in the inclined groove of the lock box, completing the docking of the two pipe segments. A sealing gasket 30 is provided between the butt joints of the pipe segments to further improve the overall sealing of the pipe segments.

[0036] like Fig.12 As shown, Example 4 is a pipe segment joint structure. As a third solution, this implementation is for the assembly of shaft pipe segments, that is, the assembly and docking of pipe segments in vertical tunnels. For the pipe segments of the shaft structure, there is no oil cylinder push for the assembly of the pipe segments. The sealing gasket cannot be compressed to meet the waterproof requirements by relying solely on the deadweight of the pipe segments. Therefore, bolts are often used for tightening and extrusion. The main mode of action is to twist the nut horizontally. The nut further tightens and squeezes the pipe segment, thereby compressing the sealing gasket. However, there are problems such as cumbersome multiple re-tightening operations and insufficient torque for tightening the nut. In view of the above problems, on the basis of the theories of Examples 1 and 2, the lock box 2 described in this embodiment is pre-buried at the corresponding shaft pipe segment joint, the pin rod 1 is a post-installed part, and the pin rod 1 is a long rod and passes through the lock box 2 upward. In this embodiment, the second elastic member structure is adopted; that is, the elastic ring and the corresponding groove are removed, and an elastic pad is added in the gap between the split wedge block and the bottom surface of the inclined groove to ensure that the wedge block can also return to the embedded inclined groove under the action of the elastic pad, and the elastic pad can also ensure that the split wedge block moves up and down as a whole.

[0037] The method for butt jointing of pipe segments in this embodiment is as follows: the lock box is located at the design position of the pipe segment joint of the shaft, the pin rod is a long rod structure, passes through the reserved through-length hole of the pipe segment, and is connected to the double-opening lock box set on the end face of the pipe segment. The double-opening lock box, that is, the lock box has openings at both ends, and the pin rod enters from the inclined slot, passes through the central channel of the split wedge block, and passes out from the rear opening of the lock box to complete the initial connection. Then, the through-core jack is used to lock the end of the pin rod and push the lock box to reduce the distance between the pipe segments. At this time, the split wedge block is separated from the inclined slot, compressing the elastic pad, and then the elastic pad rebounds to return the split wedge block to its original position, holding the pin rod tightly against the wedge block, and completing the butt joint assembly of the vertical pipe segments.

[0038] like Fig.13 , 14As shown, embodiment 5 is a segment joint structure, as scheme 4, in order to enhance the shear resistance of the segment connection, the pin rod 1 is connected to the corresponding segment joint through the embedded sleeve 6, and a lock box reserved groove is provided at the segment joint. The lock box 2 is a post-installed part and two petal wedges 3 are symmetrically arranged in the lock box 2. In this embodiment, the lock box is used as the shear resistance structure, and the two lock boxes are assembled to form a combined lock box. Two symmetrical inclined grooves are arranged in the combined lock box, and the petal wedges are placed in the inclined grooves respectively. The gap between the petal wedge and the bottom surface of the inclined groove is filled by an elastic pad.

[0039] The connection method of the pipe segment joint structure of this embodiment, S1: When connecting, the two pin rods are respectively connected to the embedded sleeves of the two pipe segments (refer to the inclined bolts), and after the connection is completed, the other end of the pin rod is connected to the combination lock box. The combination lock box first receives and inserts the pin rods protruding from the two pipe segments, and the pipe segments are connected by moving the combination lock box; after the connection is completed, the pipe segments to be assembled are pushed forward, the combination lock box is embedded in the reserved groove of the pipe segment, and the pin rod is inserted into the petal wedge block. Specifically, the pin rod is aligned with the petal wedge block and then the lock box is moved and the pin rod is inserted into the lock box. The pin rod pushes the petal wedge block to the bottom surface of the truncated cone cavity in the lock box and props up the petal wedge block. The central channel of the petal wedge block is enlarged, and the multi-step groove ring on the pin rod and the multi-step gear ring on the central channel are staggered and moved. The pin rod continues to move until the multi-step groove ring and the multi-step gear ring are engaged and connected. The petal wedge block rebounds to the locking position under the action of the elastic member. The petal wedge block holds the pin rod tightly and can move with the pin rod; S2: When connecting the second segment: When the other pin needs to connect the split wedge on the corresponding side, move the lock box to disengage the split wedge from the lock box locking position. The closer the split wedge is to the bottom surface of the inner truncated cone cavity of the lock box, the larger the surplus space between its circumference and the lock box, so the lock box is moved circumferentially to align with the other pin; then complete the connection between the pin and the split wedge according to S1; complete the connection of the segment joint structure. The combination lock box and the pin are connected, that is, the segment is assembled. At this time, the shear force during the operation between the segments is borne by the combination lock box, and the safety is more guaranteed.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe segment joint structure, characterized in that: The invention comprises a lock box (2) and a pin rod (1); a split wedge (3) is arranged in the lock box (2); the split wedge (3) cooperates with the wedge surface of the lock box (2); an elastic member for resetting the split wedge (3) is arranged on the split wedge (3) or in the lock box (2); and the pin rod (1) and the split wedge (3) are connected in a tooth-groove bite manner.

2. The pipe segment joint structure according to claim 1, characterized in that: The petal-type wedge (3) comprises N petal-type parts, N≥2, and the N petal-type parts form a truncated cone structure with a central hole inside; a truncated cone cavity (2-1) corresponding to the truncated cone structure is opened in the lock box (2), and the depth of the truncated cone cavity is greater than the height of the truncated cone structure; the petal-type wedge (3) is embedded in the lock box (2) in a state of being wider at the top and narrower at the bottom, forming a locking structure of the lock box (2) for preventing the petal-type wedge (3) from retreating.

3. The segment joint structure according to claim 2, characterized in that: The split-flap wedge (3) comprises two split-flap parts, the two split-flap parts being a left split-flap wedge (3-1) and a right split-flap wedge (3-2). The inner diameter of the central hole is consistent with the outer diameter of the pin rod (1). A multi-step gear ring (31) is provided on the inner wall of the central hole. A multi-step groove ring (11) is provided on the pin rod (1). The multi-step gear ring and the multi-step groove ring are engaged with each other to form a tooth-groove engagement. The split-flap wedge (3) forms a stop structure for the pin rod (1) in the tooth-groove engagement.

4. The pipe segment joint structure according to claim 3, characterized in that: The multi-step gear ring includes several annular protrusions arranged in parallel, the cross-section of the annular protrusion is an inverted right triangle or an inverted right trapezoid, the plane corresponding to the top edge of the inverted right triangle or inverted right trapezoid forms a stop surface plane, and the inclined surface corresponding to the hypotenuse of the inverted right triangle or inverted right trapezoid forms an insertion inclined surface; the multi-step groove ring includes several annular grooves arranged in parallel, the cross-section of the annular grooves is a rectangle or a right right triangle or right right trapezoid corresponding to the annular protrusion.

5. The pipe segment joint structure according to claim 1, characterized in that: The elastic member is an elastic ring (4), a positioning groove (32) is provided on the outer wall of the split-petal wedge (3), and the elastic ring (4) is sleeved on the split-petal wedge (3) and located in the positioning groove (32); Alternatively, the elastic member is an elastic pad (5), which is embedded in the lock box (2) and arranged axially corresponding to the split-flap wedge (3).

6. The pipe segment joint structure according to claim 5, characterized in that: An outer ring protrusion (12) is provided at the middle of the pin rod (1), and an inclined transition connection is formed between the outer ring protrusion (12) and the pin rod (1). An inclined bell mouth is provided at the insertion end of the split wedge block (3), and the inclined surface between the outer ring protrusion (12) and the pin rod (1) corresponds to the inclined bell mouth.

7. The pipe segment joint structure according to claim 5 or 6, characterized in that: The lock box (2) is pre-buried at the corresponding pipe segment joint, and the pin rod (1) is a post-installed component and is inserted into the lock box (2).

8. The pipe segment joint structure according to claim 5, characterized in that: The lock box (2) is pre-buried at the corresponding shaft segment joint, the pin rod (1) is a post-installed component, and the pin rod (1) is a long rod that passes through the lock box (2) upwards.

9. The pipe segment joint structure according to claim 5 or 6, characterized in that: The pin rod (1) is connected to the corresponding pipe segment joint through a pre-buried sleeve (6), a locking box reserved groove is provided at the pipe segment joint, the locking box (2) is a post-installed component and two split wedge blocks (3) are symmetrically arranged in the lock box (2) in the upper and lower parts.

10. A connection method using the pipe segment joint structure according to claim 7, characterized in that: S1: The pin rod is aligned with the split wedge block and inserted into the lock box. The pin rod pushes the split wedge block to the bottom surface of the truncated cone cavity in the lock box and spreads the split wedge block. The central channel of the split wedge block is enlarged, and the multi-step groove ring on the pin rod and the multi-step gear ring on the central channel are staggered and moved. The pin rod continues to move forward until the multi-step groove ring and the multi-step gear ring are engaged and connected. The split wedge block rebounds and resets to the locked position under the action of the elastic member. The split wedge block holds the pin rod tightly and can move with the pin rod; S2: When the pin rod needs to be connected to another split wedge, the pin rod is moved to disengage the split wedge from the locking position of the lock box. The closer the split wedge is to the bottom surface of the conical cavity in the lock box, the larger the surplus space between its circumferential side and the lock box. The pin rod is thus moved circumferentially to achieve active circumferential adjustment of the pin rod so as to align it with the other split wedge. Then, the connection between the pin rod and the split wedge is completed according to S1. The connection of the segment joint structure is completed.

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