A bottom cross plug device for a lock pipe joint of a diaphragm wall

Abstract

The application discloses a bottom cross plug device for a lock pipe joint of an underground continuous wall, which comprises a cross plug plate, a sealing plate, an inner plug joint, a reinforced plate and a pin shaft; the cross plug plate is welded into a cross shape by three steel plates; the sealing plate is a circular steel plate and has a diameter consistent with the outer diameter of the lock pipe; the inner plug joint is a circular steel pipe and has an outer diameter slightly smaller than the inner diameter of the lock pipe; the reinforced plate is arranged on the inner side of the inner plug joint steel pipe; and the pin shaft is fixedly connected with the bottom lock pipe and the bottom cross plug device through a pin hole. In actual construction, the cross steel plate is inserted into the bottom soil of the slot section to fix the lock pipe, so that the anti-deviation capacity of the lower part of the lock pipe is enhanced, and the occurrence of the situations such as the flow around the bottom of the lock pipe during the concrete pouring is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of diaphragm wall construction technology, specifically to a bottom cross-shaped plug device for diaphragm wall interlocking pipe joints, applicable to diaphragm wall projects in ports, docks, urban high-rise buildings, and subways, used to solve technical problems related to the sinking, positioning, and sealing of interlocking pipes. Background Technology

[0002] With the continuous expansion of urban areas and the increasing urgency for underground space development, the development of deep foundation pits and diaphragm walls has been promoted. Interlocking pipe joints, a commonly used joint type in diaphragm wall construction, are widely used in practical projects. However, in actual operation, due to the influence of sediment and other factors within the trench section, it is difficult to lower the interlocking pipe to the bottom of the trench, resulting in voids at the bottom and causing concrete to flow around the pipe. In existing technologies, such as the process equipment for rigid joint construction of diaphragm walls disclosed in patent (CN86207210U), a horseshoe-shaped interlocking pipe is used in conjunction with a sliding joint box to achieve rigid joint construction. However, this device does not have a dedicated positioning and sealing structure designed for the bottom end of the interlocking pipe. During the sinking process, the interlocking pipe is easily affected by sediment in the trench section, making it difficult to accurately sink to the bottom of the trench, resulting in gaps at the bottom. When pouring concrete, concrete flow around the pipe is very likely to occur, affecting the construction quality of the joint. The groutable embedded pipe curtain water-stopping interlocking device disclosed in patent (CN110284513A) is mainly suitable for the connection and water-stopping of pipe curtain structures. Its technical solution is designed for the splicing of pipe curtain bodies and cannot adapt to the bottom installation requirements of the interlocking pipe in diaphragm walls. Moreover, this device does not solve the problems of interlocking pipe sinking offset and bottom sealing, and cannot meet the construction requirements of interlocking pipe joints in diaphragm walls.

[0003] Therefore, developing a bottom device for the interlocking pipe joint that can achieve precise placement of the interlocking pipe and effectively prevent displacement and concrete flow has become an urgent technical problem to be solved in the field of diaphragm wall construction technology. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a bottom cross plug device for interlocking pipe joints in underground continuous walls, which aims to solve the technical problems of interlocking pipes being difficult to sink to the bottom of the trench, gaps being generated at the bottom, interlocking pipes shifting backward and concrete flowing around during concrete pouring.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint includes a cross-shaped insert plate, a sealing plate, an inner plug joint, a reinforcing plate, and a pin. The cross-shaped insert plate is made of three steel plates welded into a cross shape. The sealing plate is a circular steel plate with a diameter consistent with the outer diameter of the interlocking pipe. The inner plug joint is a circular steel pipe with an outer diameter slightly smaller than the inner diameter of the interlocking pipe. The reinforcing plate is disposed inside the steel pipe of the inner plug joint. The pin joint fixes the bottom interlocking pipe to the bottom cross-shaped plug device through a pin hole. Furthermore, the three steel plates of the cross-shaped insert plate have a height of 1~1.5m and a thickness of 8~12mm.

[0006] Furthermore, a continuous reinforcing weld is provided at the intersection of the three steel plates; the reinforcing weld can enhance the overall structural strength of the cross plate and improve the device's resistance to displacement.

[0007] Furthermore, the sealing plate is provided with multiple grout outlet holes, which are evenly distributed in a quincunx pattern, and the quincunx-shaped arrangement of the grout outlet holes can achieve uniform grout coverage.

[0008] Furthermore, the thickness of the sealing plate is 10~14mm.

[0009] Furthermore, the upper part of the steel pipe of the inner connector is provided with a plurality of pin holes evenly arranged circumferentially, and the axis of the pin holes is perpendicular to the axis of the inner connector.

[0010] Furthermore, the stiffening plate consists of multiple rectangular steel plates, evenly distributed along the circumference of the inner wall of the inner connector, and welded and reinforced to the inner wall of the steel pipe and the sealing plate.

[0011] Furthermore, the thickness of the stiffening plate is 6~10mm. Furthermore, the pin is a stepped shaft structure, with an anti-loosening groove and a matching anti-loosening pin at one end, and an external thread and a locking nut at the other end. An elastic sealing gasket is fitted on the mating surface between the pin and the pin hole.

[0012] Furthermore, the lower end of the cross-shaped insert plate is integrally provided with a conical guide head, which can reduce the soil resistance during sinking and facilitate the device to penetrate the sediment layer at the bottom of the trench.

[0013] Compared with the prior art, the present invention has the following significant advantages: 1. Solving the problem of sinking the lock pipe: The conical guide head at the lower end of the cross plate reduces the penetration resistance of the sediment layer, allowing the lock pipe to be accurately sunk to the bottom of the tank, avoiding bottom gaps caused by sediment, and reducing the risk of concrete bypassing from the source.

[0014] 2. Enhanced resistance to displacement: The cross structure of the cross-shaped insert plate and the reinforced weld at the intersection significantly enhance the overall rigidity of the device. When pouring concrete, it can effectively resist lateral pressure, prevent the locking pipe from shifting or misaligning, and ensure the accuracy of joint construction.

[0015] 3. Enhanced grouting effect: The plum blossom-shaped grout outlet of the sealing plate, combined with the one-way valve, achieves uniform grouting coverage; 4. Enhanced connection stability: The circumferential distribution of multiple pin holes in the internal connector, the stepped shaft structure of the pin, and the double anti-loosening design ensure a firm connection between the device and the locking tube, preventing detachment during construction and improving construction safety.

[0016] 5. Wide range of applications: The device structure is compatible with different specifications of interlocking pipes and can be widely used in various underground continuous wall projects such as ports, docks, urban high-rise buildings, and subways, making it highly practical.

[0017] In summary, by adopting the technical solution of the present invention, when using the interlocking pipe joint in the construction of the ground wall, it can be better inserted into the bottom of the trench section, enhancing the anti-displacement ability of the lower part of the interlocking pipe, and avoiding the situation where the bottom interlocking pipe is affected by the concrete and moves backward during the pouring of concrete. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bottom cross-shaped plug device of the present invention; Figure 2 This is a top view of the bottom cross-shaped plug device structure of the present invention; Figure 3 This is a schematic diagram of the connection between the bottom cross-shaped plug device and the locking tube of the present invention; In the diagram, 1-cross insert plate, 2-sealing plate, 21-slurry outlet hole, 3-inner insert connector, 4-reinforcing plate, 5-pin hole, 6-pin shaft, 7-locking tube. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] like Figure 1 , 2 As shown in Figures 1 and 3, the present invention provides a bottom cross plug device for a diaphragm wall interlocking pipe joint, comprising a cross insert plate 1, a sealing plate 2, an inner insert connector 3, a reinforcing plate 4, and a pin 6.

[0021] The cross insert 1 is made of three steel plates welded into a cross shape. The height of the steel plates is 1~1.5m and the thickness of the steel plates is 8~12mm.

[0022] The sealing plate 2 is a circular steel plate with the same diameter as the outer diameter of the locking tube 7. Grout holes 21 are arranged on the steel plate and welded to the cross-shaped insert plate 1. The thickness of the sealing plate is 10~14mm.

[0023] The inner connector 3 is a circular steel pipe with an outer diameter slightly smaller than the inner diameter of the locking tube. A pin hole 5 is provided on the upper part of the steel pipe, corresponding to the pin hole of the locking tube, and is welded to the sealing plate 2 to form a whole.

[0024] The stiffening plate 4 consists of multiple rectangular steel plates, which are placed inside the steel pipe of the inner connector 3 and welded to the inner wall of the steel pipe and the sealing plate for reinforcement. The thickness is 6~10mm.

[0025] The pin 6 securely connects the bottom locking tube and the bottom end device of the present invention through the pin hole 5.

[0026] During construction, the inner connector is first inserted into the bottom of the locking tube, and the two are fixedly connected by passing a pin through the pin hole. Then, the assembled device is hoisted into the trench section, and the tapered guide head at the lower end of the cross plate penetrates the sediment layer to make the sealing plate fit the bottom of the trench. Before pouring concrete, grout is injected into the bottom voids through the grouting channel, and a one-way valve prevents the grout from flowing back, thus sealing the voids. During the pouring process, the cross structure of the cross plate and the reinforced weld enhance the anti-displacement ability, the stiffening plate enhances the load-bearing capacity of the inner connector and prevents the locking tube from moving backward, and the annular reinforcing rib prevents cracking at the weld between the sealing plate and the cross plate.

[0027] In actual construction, using cross steel plates inserted into the soil at the bottom of the trench to fix the locking pipe can not only enhance the anti-displacement ability of the lower part of the locking pipe, but also effectively prevent concrete from flowing around the bottom of the locking pipe during pouring.

Claims

1. A bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint, characterized in that, The device includes a cross-shaped insert plate, a sealing plate, an inner connector, a reinforcing plate, and a pin. The cross-shaped insert plate is made of three steel plates welded into a cross shape. The sealing plate is a circular steel plate with a diameter matching the outer diameter of the locking tube. The inner connector is a circular steel tube with an outer diameter slightly smaller than the inner diameter of the locking tube. The reinforcing plate is located inside the inner connector's steel tube. The pin securely connects the bottom locking tube to the bottom cross-shaped insert device via a pin hole. The sealing plate has multiple grout outlet holes arranged in a staggered, quincunx pattern, which ensures uniform grout coverage. The inner connector... The upper part of the steel pipe is uniformly provided with multiple pin holes along the circumference, and the axis of the pin holes is perpendicular to the axis of the inner connector. The reinforcing plate is composed of multiple rectangular steel plates, which are evenly distributed along the inner wall of the inner connector and welded to the inner wall of the steel pipe and the sealing plate for reinforcement. The pin shaft is a stepped shaft structure, with an anti-detachment pin groove and matching anti-detachment pin at one end and an external thread and locking nut at the other end. An elastic sealing gasket is fitted on the mating surface between the pin shaft and the pin hole. The lower end of the cross plate is integrally provided with a conical guide head, which can reduce the soil resistance during sinking and facilitate the device to penetrate the sediment layer at the bottom of the trench.

2. The bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint according to claim 1, characterized in that, The three steel plates of the cross-shaped insert plate are 1~1.5m high and 8~12mm thick.

3. The bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint according to claim 2, characterized in that, The three steel plates are provided with continuous reinforcing welds at their intersections; these reinforcing welds enhance the overall structural strength of the cross plate and improve the device's resistance to displacement.

4. The bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint according to claim 1, characterized in that, The thickness of the sealing plate is 10~14mm.

5. The bottom cross-shaped plug device for a diaphragm wall interlocking pipe joint according to claim 1, characterized in that, The thickness of the stiffening plate is 6~10mm.

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