PRC pipe pile stand column and concrete inner supporting beam connecting joint for deep foundation pit supporting construction and construction method

Abstract

The invention relates to the technical field of deep foundation pit supporting, in particular to a PRC pipe pile stand column and concrete inner supporting beam connecting joint for deep foundation pit supporting construction and a construction method.The PRC pipe pile stand column and concrete inner supporting beam connecting joint comprises a steel sleeve, a steel bar connecting disc, a steel tray and a PRC pipe pile; the top end of the PRC pipe pile is fixedly connected with the first concrete inner supporting beam, the PRC pipe pile is fixedly sleeved with a steel sleeve, and the steel sleeve penetrates through the upper side and the lower side of the second concrete inner supporting beam and is fixedly connected with the top end face of the second concrete inner supporting beam through a steel bar connecting disc at the top end of the second concrete inner supporting beam. And the steel sleeve is fixedly connected with the bottom end face of the second concrete inner supporting beam through a steel tray at the bottom end of the second concrete inner supporting beam. According to the PRC pipe pile stand column and concrete inner supporting beam connecting joint and the construction method, the construction difficulties that the age of a concrete cast-in-place pile is long, and the pile forming quality is difficult to control can be well solved.

Description

Technical Field

[0001] The invention relates to the technical field of deep foundation pit support, and in particular to a connection node and a construction method of a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction. Background Art

[0002] At present, with the development of more and more high-rise, super-high-rise buildings and underground spaces in cities, in order to ensure the safety of buildings, the depth of foundation pits is getting deeper and deeper. For foundation pit construction, deep foundation pit excavation and support is one of the indispensable and important construction methods.

[0003] At present, the design of deep foundation pit support column piles mostly adopts concrete cast-in-place piles + steel lattice column columns, which have complex connection nodes, difficult to control construction quality, and a long construction period. Summary of the invention

[0004] The object of the present invention is to provide a connection node and a construction method for a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction, so as to solve the technical problems existing in the above-mentioned background technology.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction comprises: a first concrete inner support beam, a steel casing, a steel bar connection plate, a second concrete inner support beam, a steel tray and a PRC pipe pile, wherein the first concrete inner support beam is located directly above the second concrete inner support beam, the top end of the PRC pipe pile is fixedly connected to the first concrete inner support beam, a steel casing is fixedly sleeved on the PRC pipe pile, the steel casing passes through the upper and lower sides of the second concrete inner support beam and is fixedly connected to the top end surface of the second concrete inner support beam through the steel bar connection plate at the top end of the second concrete inner support beam, and the steel casing is fixedly connected to the bottom end surface of the second concrete inner support beam through the steel tray at the bottom end of the second concrete inner support beam.

[0007] Furthermore, the PRC pipe piles are connected to the embedded steel bars in the first concrete inner support beam.

[0008] Furthermore, the steel casing is pre-buried on the PRC pile according to the elevation of the second concrete inner support beam.

[0009] Furthermore, the steel bar connecting plate is in a circular ring shape, the annular inner wall of the steel bar connecting plate is welded and fixed to the upper outer wall of the steel casing, and the embedded steel bars extending from the top end of the second concrete inner support beam are fixedly connected to the steel bar connecting plate.

[0010] Furthermore, a circular hole is opened in the middle of the second concrete inner support beam, and the size of the circular hole matches the size of the steel casing.

[0011] Furthermore, the steel pallet is a rectangular plate with a circular hole in the middle, the inner wall of the circular hole on the steel pallet is welded and fixed to the lower outer wall of the steel casing, and the top end surface of the steel pallet is in tight contact with the bottom end surface of the second concrete inner support beam.

[0012] Furthermore, it also includes: a steel support plate, which is triangular and is provided in plurality, and the plurality of steel support plates are evenly fixedly connected to the connection between the bottom end of the steel tray and the outer wall of the steel casing.

[0013] A deep foundation pit support construction method, using a PRC pipe pile column for deep foundation pit support construction and a concrete inner support beam connection node, specifically comprising the following steps:

[0014] Step 1: Level the construction site, accurately determine the pile position, and put the pile driver in place according to the pile position when driving the pile;

[0015] Step 2: Put the diesel hammer pile driver in place, align the hammer head vertically to the center of the pile, and ensure that the verticality deviation of the pile is no more than 0.5%;

[0016] Step 3: Start the diesel hammer pile driver and continuously impact the center of the pile until the pile hole reaches the specified depth;

[0017] Step 4: After the pile hole construction is completed, the crane is in place and ready to hoist the PRC pile. After the PRC pile is inserted into the pile position, it is first inserted 1.5 to 2 meters, and then the PRC pile is vertically stabilized. The verticality deviation of the PRC pile during insertion shall not exceed 0.5%. Finally, a vibrating pile driver is used to vibrate the PRC pile to the designed elevation.

[0018] Step 5: Excavate the foundation pit. When excavating to the bottom of the first inner support beam, the PRC pipe piles are connected to the steel bars of the first concrete inner support beam. The foundation pit is excavated to below the bottom elevation of the second concrete inner support beam. As required, the steel support plates and steel trays are welded to the PRC pipe piles, the steel bar connecting plates are installed, the crown beam steel bars are installed, the water-stop curtain is installed, the formwork is supported, and the concrete is poured.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention adopts PRC pipe piles to be connected with the steel bars of the concrete inner support beam through steel sleeves, so earth excavation can be carried out without waiting for the concrete of the cast-in-place piles to reach the age. The support system of the present invention solves the construction difficulties such as the long age of the concrete cast-in-place piles and the difficulty in controlling the quality of the piles.

[0021] 2. The present invention is easy to implement, uses conventional materials, has the characteristics of simple and fast operation, safe and reliable structure, cost saving, etc., and can be widely used in deep foundation pits and foundation pit support structures with complex geology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an elevation view of the connection node between the PRC pipe pile column and the concrete inner support beam provided by the present invention;

[0023] Figure 2 It is a cross-sectional view of the connection node between the PRC pipe pile column and the concrete inner support beam provided by the present invention;

[0024] Figure 3 It is a structural schematic diagram of a connection node between a PRC pipe pile column and a concrete inner support beam provided by the present invention.

[0025] The numbers in the attached drawings are: 1-the first concrete inner support beam, 2-steel casing, 3-rebar connecting plate, 4-steel support plate, 5-the second concrete inner support beam, 6-steel tray, 7-PRC pipe pile. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] See also Figures 1 to 3 As shown, a connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction is characterized in that it includes: a first concrete inner support beam 1, a steel casing 2, a steel bar connecting plate 3, a second concrete inner support beam 5, a steel tray 6 and a PRC pipe pile 7. The first concrete inner support beam 1 is located directly above the second concrete inner support beam 5. The top of the PRC pipe pile 7 is fixedly connected to the first concrete inner support beam 1. A steel casing 2 is fixedly sleeved on the PRC pipe pile 7. The steel casing 2 passes through the upper and lower sides of the second concrete inner support beam 5 and is fixedly connected to the top surface of the second concrete inner support beam 5 through the steel bar connecting plate 3 at the top of the second concrete inner support beam 5. The steel casing 2 is fixedly connected to the bottom end surface of the second concrete inner support beam 5 through the steel tray 6 at the bottom end of the second concrete inner support beam 5.

[0028] In this embodiment, the PRC piles 7 are connected to the embedded steel bars in the first concrete inner support beam 1 .

[0029] In this embodiment, the PRC pipe pile 7 is pre-embedded with a pre-embedded steel sleeve 2 during production. The steel sleeve 2 is pre-embedded on the PRC pipe pile 7 according to the elevation of the second concrete inner support beam 5 to ensure the accuracy of the pre-embedded position and avoid misalignment of the beam-column node connection during subsequent construction.

[0030] In this embodiment, the steel bar connecting plate 3 is annular, the annular inner wall of the steel bar connecting plate 3 is welded and fixed to the upper outer wall of the steel casing 2, and the embedded steel bars extending from the top of the second concrete inner support beam 5 are fixedly connected to the steel bar connecting plate.

[0031] In this embodiment, a circular hole is opened in the middle of the second concrete inner support beam 5 , and the size of the circular hole matches the size of the steel casing 2 .

[0032] In this embodiment, the steel tray 6 is a rectangular plate with a circular hole in the middle. The inner wall of the circular hole on the steel tray 6 is welded and fixed to the lower outer wall of the steel casing 2, and the top surface of the steel tray 6 is in tight contact with the bottom surface of the second concrete inner support beam 5.

[0033] In this embodiment, the connection node between the PRC pipe pile column and the concrete inner support beam also includes: a steel support plate 4, which is triangular and is provided in plurality. The plurality of steel support plates 4 are evenly fixedly connected to the connection between the bottom end of the steel tray 6 and the outer wall of the steel casing 2. The plurality of steel support plates 4 provided can improve the connection strength between the steel tray 6 and the steel casing 2.

[0034] A deep foundation pit support construction method specifically comprises the following steps:

[0035] Step 1: Level the construction site, accurately determine the pile position, and put the pile driver in place according to the pile position when driving the pile;

[0036] Step 2: Put the diesel hammer pile driver in place, align the hammer head vertically to the center of the pile, and ensure that the verticality deviation of the pile is no more than 0.5%;

[0037] Step 3: Start the diesel hammer pile driver and continuously impact the center of the pile until the pile hole reaches the specified depth;

[0038] Step 4: After the pile hole construction is completed, the crane is in place and ready to hoist the PRC pile. After the PRC pile is inserted into the pile position, it is first inserted 1.5 to 2 meters, and then the PRC pile is vertically stabilized. The verticality deviation of the PRC pile during insertion shall not exceed 0.5%. Finally, a vibrating pile driver is used to vibrate the PRC pile to the designed elevation.

[0039] Step 5: Excavate the foundation pit. When excavating to the bottom of the first inner support beam, the PRC pipe piles are connected to the steel bars of the first concrete inner support beam. The foundation pit is excavated to below the bottom elevation of the second concrete inner support beam. As required, the steel support plates, steel trays and PRC pipe piles are welded, the steel bar connecting plates are installed, the crown beam steel bars are installed, the water-stop curtain is installed (the water-stop curtain is a single-axis water-stop mixing pile), the formwork is supported, and concrete is poured.

[0040] The present invention adopts PRC pipe piles to be connected with the steel bars of the concrete inner support beam through a steel sleeve, so that earth excavation can be carried out without waiting for the cast-in-place pile concrete to reach the age. The support system of the present invention solves the construction difficulties such as the long age of concrete cast-in-place piles and the difficulty in controlling the quality of piles. It is easy to implement, uses conventional materials, has the characteristics of simple and fast operation, safe and reliable structure, cost saving, etc., and can be widely used in deep foundation pits and foundation pit support structures with complex geology.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction, characterized in that: include: A first concrete inner support beam (1), a steel casing (2), a steel bar connection plate (3), a second concrete inner support beam (5), a steel tray (6) and a PRC pipe pile (7), wherein the first concrete inner support beam (1) is located directly above the second concrete inner support beam (5), the top end of the PRC pipe pile (7) is fixedly connected to the first concrete inner support beam (1), the PRC pipe pile (7) is fixedly sleeved with a steel casing (2), the steel casing (2) passes through the upper and lower sides of the second concrete inner support beam (5) and is fixedly connected to the top end surface of the second concrete inner support beam (5) at the top end of the second concrete inner support beam (5) through the steel bar connection plate (3), and the steel casing (2) is fixedly connected to the bottom end surface of the second concrete inner support beam (5) at the bottom end of the second concrete inner support beam (5) through the steel tray (6).

2. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 1, characterized in that: The PRC pipe pile (7) is connected to the pre-buried steel bars in the first concrete inner support beam (1).

3. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 1, characterized in that: The steel casing (2) is pre-buried on the PRC pipe pile (7) according to the elevation of the second concrete inner support beam (5).

4. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 1, characterized in that: The steel bar connection plate (3) is in the shape of a circular ring, the annular inner wall of the steel bar connection plate (3) is welded and fixed to the upper outer wall of the steel casing (2), and the embedded steel bars extending from the top end of the second concrete inner support beam (5) are fixedly connected to the steel bar connection plate.

5. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 1, characterized in that: A circular hole is provided in the middle of the second concrete inner support beam (5), and the size of the circular hole matches the size of the steel casing (2).

6. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 1, characterized in that: The steel tray (6) is a rectangular plate with a circular hole in the middle. The inner wall of the circular hole on the steel tray (6) is welded and fixed to the lower outer wall of the steel casing (2). The top end surface of the steel tray (6) is in tight contact with the bottom end surface of the second concrete inner support beam (5).

7. A connection node between a PRC pipe pile column and a concrete inner support beam for deep foundation pit support construction according to claim 7, characterized in that: Also includes: The steel support plate (4) is triangular and is provided in a plurality of pieces. The plurality of steel support plates (4) are evenly fixedly connected to the connection between the bottom end of the steel tray (6) and the outer wall of the steel casing (2).

8. A deep foundation pit support construction method, using the PRC pipe pile column and concrete inner support beam connection node for deep foundation pit support construction according to any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: Level the construction site, accurately determine the pile position, and put the pile driver in place according to the pile position when driving the pile; Step 2: Put the diesel hammer pile driver in place, align the hammer head vertically to the center of the pile, and ensure that the verticality deviation of the pile is no more than 0.5%; Step 3: Start the diesel hammer pile driver and continuously impact the center of the pile until the pile hole reaches the specified depth; Step 4: After the pile hole construction is completed, the crane is in place and ready to hoist the PRC pile. After the PRC pile is inserted into the pile position, it is first inserted 1.5 to 2 meters, and then the PRC pile is vertically stabilized. The verticality deviation of the PRC pile during insertion shall not exceed 0.5%. Finally, a vibrating pile driver is used to vibrate the PRC pile to the designed elevation. Step 5: Excavate the foundation pit. When excavating to the bottom of the first inner support beam, the PRC pipe piles are connected to the steel bars of the first concrete inner support beam. The foundation pit is excavated to below the bottom elevation of the second concrete inner support beam. As required, the steel support plates and steel trays are welded to the PRC pipe piles, the steel bar connecting plates are installed, the crown beam steel bars are installed, the water-stop curtain is installed, the formwork is supported, and the concrete is poured.

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