A prefabricated pipe pile support temporary drainage device and a construction method thereof

Abstract

This invention provides a temporary drainage device and its construction method for precast pipe pile support, belonging to the field of foundation pit support technology. The device includes a gap filling device and precast pipe pile units. The gap filling device is set between adjacent precast pipe pile units. The gap filling device includes pipe fittings, a top support plate, and gaskets. Multiple pipe fittings and multiple gaskets are staggered between adjacent precast pipe pile units. The two ends of the top support plate are connected to the precast pipe pile units. Gaskets and pipe fittings are set between the precast pipe pile units. The gaskets are used to adjust and compact the spacing between pipe fittings or between pipe fittings and precast pipe pile units, thereby preventing water from seeping into the foundation pit sidewall and preventing the formation of channels between pipe fittings that could cause soil erosion and piping. This method sets the drainage hole position away from the precast pipe pile embedded plate to prevent stress concentration at the precast pipe pile embedded plate due to the presence of walers and top supports.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foundation pit support, and particularly relates to a prefabricated pipe pile support temporary drainage device and a construction method thereof. BACKGROUND

[0002] In the prior art, most of the foundation pit supports adopt cast-in-place piles (in the form of row piles) combined with water stop curtains or underground continuous walls, and prestressed pipe pile support forms are less, and the cast-in-place piles and underground continuous walls have long on-site construction time, large environmental impact and more construction machinery; when it rains, the foundation pit support structure is improper, and the soil will be lost with the rainfall.

[0003] In underground engineering construction, when the construction party excavates an aquifer, due to the fact that drainage is not timely or the drainage volume is not large enough, the water pressure of the aquifer is rapidly increased, thereby cracking or breaking the surrounding rock, and causing a large amount of sudden gushing of underground water. Pipe gushing may cause serious safety accidents and engineering quality problems.

[0004] In reality, we often use the following methods to avoid the occurrence of pipe gushing:

[0005] (1) Increase the surrounding rock support measures, such as reinforcing the support structure, grouting and filling compaction, etc., to enhance the bearing capacity of the surrounding rock.

[0006] (2) Adopt drainage measures, such as pre-grouting drainage, sectional drainage and lowering the water level, etc., to reduce the water pressure and control the water flow.

[0007] (3) Reasonably design the engineering scheme, such as selecting appropriate construction sequence and method, shortening the construction time, avoiding excessive excavation, etc.

[0008] (4) Strictly monitor the construction site, find the pipe gushing danger in time, and take measures to control.

[0009] (5) Train and manage the site operating personnel, improve their safety awareness and operation skills, and reduce the risk of safety accidents.

[0010] Preventing the occurrence of pipe gushing is a problem that we focus on in the process of designing the foundation pit support.

[0011] A pipe pile with supporting and drainage functions is disclosed in Chinese utility model patent CN205975629U, which comprises a pipe pile body, the pipe pile body is a hollow structure, a part of the pipe pile body in the circumferential direction is inserted into the soil layer, another part of the pipe pile body in the circumferential direction extends out of the soil layer, and a through hole is formed in the part of the pipe pile body extending out of the soil layer; the length of the pipe pile body is 10-30 m, and the diameter of the pipe pile body is 600 mm-1000 mm. A part of the pipe pile body in the circumferential direction is buried in the soil layer to play a supporting role. Another part of the pipe pile body extends out of the soil layer, water in the foundation pit seeps into the pipe pile body through the through hole, then the water in the pipe pile body is pumped down to the pipe pile body through the pipe opening of the pipe pile body, and the water seeping into the pipe pile body is pumped to the outside through the water pump, so that the purpose of drainage is achieved, the functions of supporting and drainage are realized, the dewatering structure design of the foundation pit is not needed, and the pipe pile has the beneficial effects of simple structure, high construction efficiency and low cost. However, gaps exist between the pipe piles, which can easily lead to the occurrence of pipe heaving phenomenon. SUMMARY

[0012] In view of the problems in the prior art, the present application provides a prefabricated pipe pile supporting temporary drainage device and a construction method thereof, and aims to reduce the time of foundation pit supporting construction and the number of construction machines used, reduce the influence of foundation pit supporting construction on the environment, avoid soil loss due to rainfall, and prevent the occurrence of pipe heaving phenomenon.

[0013] To solve the above technical problems, the present application provides a prefabricated pipe pile supporting temporary drainage device, which comprises a gap filling device and a prefabricated pipe pile unit, and the gap filling device is arranged between adjacent prefabricated pipe pile units; the gap filling device comprises a pipe, a top support plate and a gasket, a plurality of pipes and a plurality of gaskets are arranged alternately between adjacent prefabricated pipe pile units, and the two ends of the top support plate are connected with the prefabricated pipe pile units.

[0014] Further, the prefabricated pipe pile unit comprises a prefabricated pipe pile and a prefabricated pipe pile embedded plate, and the prefabricated pipe pile and the prefabricated pipe pile embedded plate are arranged alternately.

[0015] Further, a plurality of drainage holes are formed in the side wall of the pipe.

[0016] Further, a cavity is arranged in the pipe, and backfill sand is arranged in the cavity.

[0017] Further, the top support plate and the prefabricated pipe pile unit are connected through a connecting piece.

[0018] Further, the connecting piece comprises a connecting plate and a bolt, one side of the connecting plate is connected with the top support plate through the bolt, and the other side of the connecting plate is connected with the prefabricated pipe pile unit.

[0019] Further, the top support plate and the connecting plate are both steel plates.

[0020] Further, the gasket is a flexible gasket.

[0021] Further, the pipe is a PVC pipe.

[0022] A construction method of a prefabricated pipe pile supporting temporary drainage device, which utilizes the prefabricated pipe pile supporting temporary drainage device, comprises the following steps:

[0023] Step S1: connecting the prefabricated pipe pile and the prefabricated pipe pile embedded plate;

[0024] Step S2: measuring the interval of the prefabricated pipe pile unit and simultaneously manufacturing the connecting piece;

[0025] Step S3: opening a drainage hole on the pipe, and the position of the drainage hole is staggered with the prefabricated pipe pile embedded plate.

[0026] Step S4: arranging the pipe between the prefabricated pipe piles, and adjusting the interval of each pipe or the prefabricated pipe pile and the pipe by using the gasket;

[0027] Step S5: adding backfill sand into the pipe, fixing the position of the pipe by using the top support plate, making the pipe contact with the side wall of the foundation pit, and providing support force for the side wall of the foundation pit by the pipe, and connecting the top support plate and the prefabricated pipe pile unit by using the connecting piece.

[0028] The prefabricated pipe pile supporting temporary drainage device utilizes one side of the top support plate to contact with the pipe and the gasket, fixes and positions the pipe, and makes the pipe closely contact with the soil, so that the soil is prevented from being lost due to rainfall; the gasket and the pipe are arranged between the prefabricated pipe pile units, the interval between the pipes or between the pipe and the prefabricated pipe pile unit is adjusted and compacted by using the gasket, so that the water in the foundation pit is prevented from seeping into the side wall of the foundation pit and the channel between the pipes is prevented from being formed to cause piping; the drainage hole on the pipe timely drains the water in the inner soil, and water and soil loss is avoided; the backfill sand is added into the pipe, which not only increases the rigidity of the pipe, but also filters and drains water, and prevents the soil particles from being lost with the hole; the pipe with the added backfill sand and the gasket are used as temporary support for the gap between the prefabricated pipe piles, the prefabricated pipe pile, the pipe and the gasket are connected as a whole, so that the local stress of the pipe is converted into the stress of the whole, the integrity and the stress strength are improved, and water and soil loss is prevented.

[0029] The pipe fittings made of PVC pipes in the device are connected into a whole through the factory building, the pipe fitting sizes are transported to the site through the transport vehicle after the prefabrication of the factory building, the cutting and on-site manufacturing of the pipe fittings are reduced, the crane equipment transfer is reduced, the number of used construction machines is reduced, the pipe fittings are connected with the prefabricated pipe pile units by the prefabricated connecting plates, the time of the foundation pit support construction is reduced and the influence of the foundation pit support construction on the environment is reduced, the rapid installation of the drainage support system between the prefabricated pipe pile units is realized, and the reduction of the construction time has a positive effect on the prevention of piping. Since the PVC pipe is light in quality and can be constructed by the electric hoist, the drainage device can be installed at the construction site with small space and where the crane cannot enter.

[0030] The construction method of the prefabricated pipe pile support temporary drainage device of the application arranges the position of the drainage hole and the prefabricated pipe pile embedded plate staggered, prevents the existence of the surrounding purlin and the top support at the prefabricated pipe pile embedded plate, and prevents the large stress and stress concentration at the prefabricated pipe pile embedded plate. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of the prefabricated pipe pile support temporary drainage device of the application.

[0032] Figure 2 is a partial enlarged view of the prefabricated pipe pile support temporary drainage device of the application.

[0033] Figure 3 is a top view of the prefabricated pipe pile support temporary drainage device of the application.

[0034] Figure 4 is a partial enlarged view of the prefabricated pipe pile support temporary drainage device of the application.

[0035] Among them, 1 is a gap filling device, 3 is a connecting piece, 11 is a pipe fitting, 12 is a top support plate, 13 is a gasket, 21 is a prefabricated pipe pile, 22 is a prefabricated pipe pile embedded plate, 31 is a connecting plate, 32 is a bolt, and 111 is a drainage hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0037] The following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In order to better understand the purpose, structure and function of the present application, the prefabricated pipe pile support temporary drainage device and the construction method thereof will be further described in detail below in combination with the drawings.

[0041] Example 1:

[0042] Figure 1 And Figure 2 A prefabricated pipe pile support temporary drainage device is shown, which comprises a gap filling device 1 and a prefabricated pipe pile unit, the gap filling device 1 is arranged between adjacent prefabricated pipe pile units; the gap filling device 1 comprises a pipe fitting 11, a top support plate 12 and a gasket 13, a plurality of pipe fittings 11 and a plurality of gaskets 13 are arranged in a staggered manner between adjacent prefabricated pipe pile units, and both ends of the top support plate 12 are connected with the prefabricated pipe pile units.

[0043] Example 2:

[0044] Figure 1 And Figure 2 A prefabricated pipe pile support temporary drainage device is shown, which comprises a gap filling device 1 and a prefabricated pipe pile unit, the gap filling device 1 is arranged between adjacent prefabricated pipe pile units;

[0045] The gap filling device 1 comprises a pipe fitting 11, a top support plate 12 and a gasket 13, a plurality of pipe fittings 11 and a plurality of gaskets 13 are arranged in a staggered manner between adjacent prefabricated pipe pile units, and both ends of the top support plate 12 are connected with the prefabricated pipe pile units.

[0046] The difference between this embodiment and the first embodiment is that:

[0047] The side wall of the pipe 11 is provided with a plurality of drainage holes 111 for drainage.

[0048] Embodiment 3:

[0049] Figure 1 And Figure 2 The application shows a prefabricated pipe pile supporting temporary drainage device, which comprises a gap filling device 1 and a prefabricated pipe pile unit, and the gap filling device 1 is arranged between adjacent prefabricated pipe pile units.

[0050] The gap filling device 1 comprises a pipe 11, a top support plate 12 and a gasket 13, a plurality of pipes 11 and a plurality of gaskets 13 are arranged between adjacent prefabricated pipe pile units in a staggered manner, and the two ends of the top support plate 12 are connected with the prefabricated pipe pile units.

[0051] The side wall of the pipe 11 is provided with a plurality of drainage holes 111 for drainage.

[0052] The difference between the embodiment and the above embodiments is that:

[0053] The prefabricated pipe pile unit comprises a prefabricated pipe pile 21 and a prefabricated pipe pile embedded plate 22, and the prefabricated pipe pile 21 and the prefabricated pipe pile embedded plate 22 are arranged in a staggered manner from bottom to top; the prefabricated pipe pile embedded plate 22 has been pre-embedded when the pipe pile is prefabricated, and is used for pipe pile connection and connection of counter-bracing, enclose purlin and pipe pile drainage connection.

[0054] The prefabricated pipe pile 21 is a prestressed pipe pile, which has good crack resistance and large rigidity. Since the prestressed pipe pile exerts a prestress on the component, the appearance of cracks is delayed, and under the action of the use load, the component does not appear cracks or the cracks appear late. Therefore, the use of the prestressed pipe pile can provide the rigidity of the component and increase the durability of the structure; the prestressed pipe pile saves materials and has small self-weight. Since the prestressed pipe pile must adopt high-strength materials due to its structure, the amount of steel bars and the cross-sectional size of the component can be reduced, the steel and concrete are saved, and the self-weight of the structure is reduced, which has a significant effect on large-span and heavy-load structures.

[0055] Embodiment 3:

[0056] Figure 1 And Figure 2 The application shows a prefabricated pipe pile supporting temporary drainage device, which comprises a gap filling device 1 and a prefabricated pipe pile unit, and the gap filling device 1 is arranged between adjacent prefabricated pipe pile units.

[0057] As Figure 3 And Figure 4As shown, the gap filling device 1 comprises a pipe 11, a top support plate 12 and a gasket 13, a plurality of pipes 11 and a plurality of gaskets 13 are staggered between adjacent precast pipe pile units, and the two ends of the top support plate 12 are connected with the precast pipe pile units.

[0058] The difference between this embodiment and the above embodiments is that:

[0059] As shown in Figure 3 and Figure 4 The top support plate 12 and the precast pipe pile unit are connected through the connecting piece 3, the connecting piece 3 comprises a connecting plate 31 and a bolt 32, the end of the connecting plate 31 is connected with the top support plate 12 through the bolt 32;

[0060] One side of the top support plate 12 is in contact with the pipe 11 and the gasket 13, the pipe 11 is fixed and positioned, and the pipe 11 is in close contact with the soil;

[0061] The gasket 13 is a flexible gasket, which is used to adjust the distance and compact the pipe 11 and the precast pipe pile unit, so as to prevent water and soil loss and pipe heaving;

[0062] The top support plate 12 and the gasket 13 position the pipe, and ensure that the soil will not be lost due to rainfall.

[0063] The pipe 11 is a PVC pipe; the top support plate 12 and the connecting plate 31 are both steel plates.

[0064] According to the precast pipe pile embedded plate 22, a drainage hole is formed at the bottom of the pipe 11 and a drainage hole is formed on the inner side of the pipe 11.

[0065] The construction process of the precast pipe pile supporting temporary drainage device in this embodiment is as follows:

[0066] The precast pipe pile embedded plate 22 is welded with the arc-shaped steel plate to realize the connection between the precast pipe pile embedded plate 22 and the precast pipe pile 21, the distance of the precast pipe pile 21 which has been completed is measured, and the connecting plate 31 is also made.

[0067] According to the position of the precast pipe pile embedded plate 22, a drainage hole is formed at the bottom of the pipe 11 and a drainage hole is formed on the inner side of the pipe 11.

[0068] The pipe 11 is arranged between the precast pipe piles 21, and the flexible soft pad is used for distance adjustment and compaction.

[0069] The pipe 11 is filled with backfill sand, the pipe 11 is in close contact with the soil by the top support plate 12, and the top support plate 12 is connected with the precast pipe pile unit by the bolt 32 and the connecting plate 31.

[0070] The prefabricated pipe pile support temporary drainage device utilizes one side of the supporting plate 12 in contact with the pipe 11 and the gasket 13 to fix and position the pipe 11, and the pipe 11 is in close contact with the soil; the supporting plate 12 and the gasket 13 position the pipe 11, and ensure that the soil will not be lost due to rainfall; the gasket 13 is used to adjust and compact the spacing of the pipe 11 and the prefabricated pipe pile unit, and the drainage hole 111 on the pipe 11 timely drains the water of the soil on the side wall of the foundation pit, thereby avoiding water and soil loss.

[0071] Embodiment 4:

[0072] Figure 1 The construction method of the prefabricated pipe pile support temporary drainage device is shown, which utilizes the prefabricated pipe pile support temporary drainage device described above, and includes the following steps:

[0073] Step S1: connecting the prefabricated pipe pile 21 and the prefabricated pipe pile embedded plate 22;

[0074] Step S2: measuring the spacing of the prefabricated pipe pile unit, and simultaneously manufacturing the connecting piece;

[0075] Step S3: according to the position of the prefabricated pipe pile embedded plate 22, opening the drainage hole in the pipe 11.

[0076] Step S4: arranging the pipe 11 between the prefabricated pipe piles 21, and adjusting and compacting the spacing of the pipe 11 or the pipe 11 and the prefabricated pipe pile unit by using the gasket;

[0077] Step S5: adding backfill sand into the pipe 11, utilizing the supporting plate 12 to make the pipe 11 in close contact with the soil, and utilizing the connecting piece 31 to connect the supporting plate 12 and the prefabricated pipe pile unit.

[0078] The construction method of the prefabricated pipe pile support temporary drainage device arranges the position of the drainage hole staggered with the prefabricated pipe pile embedded plate, prevents the prefabricated pipe pile embedded plate from being subjected to large stress due to the existence of the surrounding purlin and the supporting plate at the prefabricated pipe pile embedded plate, and generates stress concentration.

[0079] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A precast tubular pile support temporary drainage device, characterized in that, The utility model provides a prefabricated pipe pile support temporary drainage device, which comprises a gap filling device and a prefabricated pipe pile unit, the gap filling device is arranged between adjacent prefabricated pipe pile units, the gap filling device comprises a pipe, a top support plate and a gasket, a plurality of pipes and a plurality of gaskets are staggered and arranged between adjacent prefabricated pipe pile units, a plurality of drainage holes are formed in the side wall of the pipe, the gasket is a flexible gasket, and the two ends of the top support plate are connected with the prefabricated pipe pile unit. The pipe is internally provided with a cavity, and the cavity is internally provided with backfill sand. The pipe is in close contact with the soil. The prefabricated pipe pile unit comprises a prefabricated pipe pile and a prefabricated pipe pile embedded plate, and the prefabricated pipe pile and the prefabricated pipe pile embedded plate are staggered and arranged; the positions of the drainage holes are staggered with the prefabricated pipe pile embedded plate.

2. The precast pipe pile support temporary drainage device according to claim 1, characterized in that, The top support plate and the prefabricated pipe pile unit are connected through a connecting piece.

3. The precast pipe pile support temporary drainage device according to claim 2, characterized in that, The connecting piece comprises a connecting plate and a bolt, one side of the connecting plate is connected with the top support plate through the bolt, and the other side of the connecting plate is connected with the prefabricated pipe pile unit.

4. The precast pipe pile support temporary drainage device according to claim 3, characterized in that, The top support plate and the connecting plate are both steel plates.

5. The precast pipe pile support temporary drainage device according to claim 4, characterized in that, The pipe is a PVC pipe.

6. A construction method of a precast tubular pile support temporary drainage device, characterized by, The prefabricated pipe pile support temporary drainage device according to any one of claims 2-5 comprises the following steps: Step S1: connecting the prefabricated pipe pile and the prefabricated pipe pile embedded plate; Step S2: measuring the interval of the prefabricated pipe pile unit and simultaneously manufacturing the connecting piece; Step S3: forming the drainage holes in the pipe, and the positions of the drainage holes are staggered with the prefabricated pipe pile embedded plate; Step S4: arranging the pipe between the prefabricated pipe piles, and adjusting the intervals of each pipe or prefabricated pipe pile and the pipe by using the gasket; Step S5: adding backfill sand into the pipe, fixing the position of the pipe by using the top support plate, making the pipe contact with the side wall of the foundation pit, providing support force for the side wall of the foundation pit by the pipe, and connecting the top support plate and the prefabricated pipe pile unit by using the connecting piece.

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