High-strength concrete pipe pile connection reinforcing device and construction method

Abstract

The invention provides a high-strength concrete pipe pile connection reinforcing device and a construction method. The construction method comprises the steps that a connecting rod piece is arranged to reinforce connection between a to-be-installed pipe pile and a previous to-be-lengthened pipe pile, the two ends of the connecting rod piece are smooth, threads are arranged in the middle of the connecting rod piece, and before the to-be-installed pipe pile is hoisted, a connecting rod is screwed into a screw hole in the end of the pipe pile; and after the previous section of pipe pile is in place, filling a proper amount of high-strength mortar in the pipe pile preformed hole, then hoisting the next section of pipe pile, aligning the connecting rod to the pipe pile preformed hole to be lengthened, lowering the hoisted pipe pile to complete the primary vertical connection of the two pipe piles, and then cleaning the end plate groove between the pipe piles and welding the groove to complete the connection of the two pipe piles. After the pipe piles are hammered in place, the mortar continues to be solidified, the connecting quality between the pipe piles can be improved, the nondestructive testing qualification rate of the pipe piles is increased, and the device is particularly suitable for stratums which are dense in soil texture, slow in hammering sinking and high in hammering frequency.

Description

Technical Field

[0001] The invention relates to the technical field of concrete prefabricated pipe pile foundation construction, and mainly relates to a high-strength concrete pipe pile connection reinforcement device and a construction method. Background Art

[0002] Concrete precast pipe piles are widely used in foundation treatment projects such as bridges, buildings and roadbeds due to their high strength, good adaptability, fast construction speed, material saving and good environmental performance. The length of a single precast pipe pile is usually 6-15m. The foundation treatment depth of buildings and bridges is generally large, and pile connection is required to increase the length of the pipe pile.

[0003] The connection methods of prefabricated pipe piles mainly include welding, flange connection and sulfur cement anchoring. The advantage of flange and bolt connection is fast pile connection speed, but it consumes a lot of steel. The sulfur cement anchoring method involves reserving anchor bars in the upper pile section and reserving anchor bar holes in the lower pile section, filling the anchor bar holes and joint planes with sulfur cement, and then applying load and pressure. However, the sulfur cement anchoring method is mainly suitable for soft soil layers and has poor adaptability to other soil layers, which limits its application in a wider range of projects. The welding method is easy to operate, fast in pile connection, and suitable for all kinds of strata. It is the most widely used pile connection method. However, the welding method is more dependent on the welding quality and has strict requirements on the welding quality. Rework often occurs due to unqualified welding quality. It is necessary to design a connection reinforcement device so that the prestressed pipe pile welding can have a wider application. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-strength concrete pipe pile connection reinforcement device and a construction method. The device is composed of common materials and has a simple structure. It can strengthen the vertical connection between prefabricated pipe piles, which is beneficial to improving the quality of pipe pile joints, increasing the qualified rate of pipe piles, and ensuring the bearing capacity of various pipe pile foundations.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: a high-strength concrete pipe pile connection reinforcement device includes an upper pipe pile end plate fixed to the upper pipe pile end by an upper pipe pile prestressed steel bar; It also includes a lower pipe pile end plate fixed to the lower pipe pile end by the lower pipe pile prestressed steel bar; The upper end plate of the upper pipe pile is processed with an upper end plate main reinforcement hole for passing the upper pipe pile prestressed steel bar, and the side of the upper end plate main reinforcement hole is connected with an upper end plate screw hole; The lower end plate is processed with a main reinforcement hole for the lower end plate through which the prestressed steel bars of the lower end plate pass, and the side of the main reinforcement hole of the lower end plate is connected with a lower end plate screw hole; The ends of the upper pipe pile and the lower pipe pile are provided with pipe pile reserved holes, and the positions of the pipe pile reserved holes correspond to the upper end plate screw holes and the lower end plate screw holes respectively; The upper pipe pile and the lower pipe pile are fixedly connected by multiple sets of connecting pieces, which are correspondingly positioned between the pipe pile reserved holes of the upper pipe pile and the lower pipe pile, and pass through the upper end plate screw holes and the lower end plate screw holes in sequence.

[0006] The ends of the upper pipe pile prestressed steel bars and the lower pipe pile prestressed steel bars are respectively subjected to upsetting treatment to form pier heads.

[0007] The diameter of the pier head is larger than the inner diameter of the corresponding main reinforcement hole of the upper end plate and the main reinforcement hole of the lower end plate; And the diameter of the pier head is smaller than the inner diameter of the corresponding upper end plate screw hole and the lower end plate screw hole.

[0008] A threaded section is processed in the middle part of the connecting piece, and the two ends of the threaded section are optical axis sections, and the lengths of the optical axis sections at the two ends are different; the threaded section is connected to the corresponding upper end plate screw hole through threaded cooperation, and the optical axis section corresponds to the reserved hole of the pipe pile.

[0009] The pipe pile reserved holes are reserved and formed by means of a pull head plate and a bolt assembly when the upper pipe pile and the lower pipe pile are cast.

[0010] The slider plate is processed with a slider plate screw hole for matching with the corresponding upper end plate screw hole or lower end plate screw hole; The bolt assembly includes common bolts and lengthened bolts, which are staggeredly installed on the screw holes of the slider plate; A tension bolt is arranged at the center of the slider plate.

[0011] The length of the ordinary bolt is the sum of the thickness of the upper pipe pile end plate and the pull head plate, and does not extend into the pipe pile concrete; the length of the other extended bolt is greater than the sum of the thickness of the upper pipe pile end plate and the pull head plate, and the part extending into the pipe pile concrete has no thread and is a smooth rod; After the upper pipe pile and the lower pipe pile are formed, the pull head plate, the ordinary bolts and the lengthened bolts are removed, and reserved holes for the pipe piles are formed at the casting positions of the lengthened bolts.

[0012] A construction method for a high-strength concrete pipe pile connection reinforcement device comprises the following steps: Step 1: Install the prestressed steel bars of the upper pipe pile, and make upsetting treatment on both ends. The upsetting head passes through the screw hole of the upper end plate, rotate the upper pipe pile end plate, and the upsetting head enters the main reinforcement hole of the upper end plate; Step 2: Use ordinary bolts and extended bolts to cross-bolt the upper pipe pile end plate and the pull head plate; Step 3: Cast, tension, maintain and shape the prefabricated pipe piles, remove the pull head plate and bolt assembly after shaping, and then fix the pipe pile end plate and reserved pipe pile holes at the end of the pipe piles; then transport the qualified pipe piles to the construction site; Step 4: Use a diesel hammer to sink the first pipe pile and bolt the connector to the reserved hole of the pipe pile to be installed; Step 5: Fill a proper amount of high-strength mortar into the reserved hole of the pipe pile to be extended, hoist the pipe pile to be installed, and then insert the exposed smooth rod of the connector into the reserved hole of the pipe pile to be extended; Step 6, cleaning the lower pipe pile end plate of the pipe pile to be connected and the upper pipe pile end plate of the pipe pile to be installed, and welding the lower pipe pile end plate and the upper pipe pile end plate of the two pipe piles; Step seven, repeat steps five to six to complete the sinking of the pipe pile in the hole.

[0013] The present invention has the following beneficial effects: 1. The invention is simple to construct, the process procedure is clear and easy to understand, and the operability is strong. The forming quality of the pipe pile joint is enhanced by reserving the connection hole, and the lateral shear resistance of the pipe pile joint is enhanced. At the same time, it plays a positioning function, and the assembly position of the pipe section is more accurate.

[0014] 2. The present invention enhances the anti-hammering performance of the pipe pile joint by connecting the connector and welding the joint, thereby increasing the sinking depth of the prefabricated pipe pile.

[0015] 3. The present invention does not change the overall manufacturing process of prefabricated pipe piles. It enhances the integrity of the pipe piles by investing in a small amount of connecting parts, improves the qualified rate of low-strain detection of pipe piles and the proportion of Class I piles, reduces the occurrence of waste piles, and saves engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is an exploded structural diagram of the connection between the upper pipe pile end plate and the lower pipe pile end plate of the present invention from a first perspective.

[0018] Figure 2 This is an exploded structural diagram from a second perspective of the connection between the upper pipe pile end plate and the lower pipe pile end plate of the present invention.

[0019] Figure 3 This is an exploded structural diagram from the first perspective of the connection between the upper pipe pile and the lower pipe pile of the present invention.

[0020] Figure 4 This is an exploded structural diagram from a second perspective of the connection between the upper pipe pile and the lower pipe pile of the present invention.

[0021] Figure 5 It is an exploded view of the pipe pile connection structure of the present invention.

[0022] Figure 6 This is an exploded view of the upper pipe pile connection structure of the present invention.

[0023] Figure 7 It is an overall structural diagram of the connection between the upper pipe pile and the lower pipe pile of the present invention.

[0024] Figure 8 This is a combined structural diagram of the slider plate and bolt assembly of the present invention.

[0025] In the figure: upper pipe pile 1, upper pipe pile prestressed steel bar 2, upper pipe pile end plate 3, upper end plate main reinforcement hole 4, upper end plate screw hole 5, connecting piece 6, lower end plate main reinforcement hole 7, lower end plate screw hole 8, lower pipe pile end plate 9, lower pipe pile prestressed steel bar 10, lower pipe pile screw hole 11, pipe pile reserved hole 12, pull head plate 13, pull head plate screw hole 14, bolt assembly 15, ordinary bolt 15-a, extension bolt 15-b, tensioning bolt 16, lower pipe pile 17. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0027] See also Figure 1-8 A high-strength concrete pipe pile connection reinforcement device includes an upper pipe pile end plate 3 fixed to the end of an upper pipe pile 1 through an upper pipe pile prestressed steel bar 2; and also includes a lower pipe pile end plate 9 fixed to the end of a lower pipe pile 17 through a lower pipe pile prestressed steel bar 10; the upper pipe pile end plate 3 is processed with an upper end plate main reinforcement hole 4 passing through the upper pipe pile prestressed steel bar 2, and the side of the upper end plate main reinforcement hole 4 is connected to the upper end plate screw hole 5; the lower pipe pile end plate 9 is processed with a lower end plate through the lower pipe pile prestressed steel bar 10 The main reinforcement hole 7 of the end plate, and the side of the main reinforcement hole 7 of the lower end plate are connected with the lower end plate screw hole 8; the ends of the upper pipe pile 1 and the lower pipe pile 17 are provided with pipe pile reserved holes 12, and the positions of the pipe pile reserved holes 12 correspond to the upper end plate screw holes 5 and the lower end plate screw holes 8 respectively; the upper pipe pile 1 and the lower pipe pile 17 are fixedly connected by multiple groups of connectors 6, and the connectors 6 are correspondingly positioned between the pipe pile reserved holes 12 of the upper pipe pile 1 and the lower pipe pile 17, and pass through the upper end plate screw holes 5 and the lower end plate screw holes 8 in sequence. By adopting the above-mentioned connection reinforcement device, a reliable connection between adjacent upper pipe piles 1 and lower pipe piles 17 can be achieved. Adjacent pipe piles are reinforced with connectors 6, and the connectors are connected to the upper pipe piles by threads and the end plate screw holes, and are fastened to the lower pipe piles by high-strength mortar. By installing the connectors first and then welding the end plates in each pile connection process, the quality of the pipe pile connection is strengthened and the overall integrity of the pipe piles is improved. After the pipe piles are hammered into place, the mortar continues to solidify, which can enhance the connection quality between the pipe piles and improve the pass rate of non-destructive testing of the pipe piles. It is particularly suitable for strata with denser soil, slow hammering, and more hammering times.

[0028] Furthermore, the ends of the upper pipe pile prestressed steel bars 2 and the lower pipe pile prestressed steel bars 10 are respectively subjected to upsetting treatment to form pier heads. The pier heads can be used to connect the corresponding upper pipe pile end plate 3 and the lower pipe pile end plate 9 at the pile end.

[0029] Furthermore, the diameter of the pier head is larger than the inner diameter of the corresponding upper end plate main rib hole 4 and lower end plate main rib hole 7; and the diameter of the pier head is smaller than the inner diameter of the corresponding upper end plate screw hole 5 and lower end plate screw hole 8. The above-mentioned size relationship can facilitate the installation of the upper pipe pile end plate 3 and the lower pipe pile end plate 9. In the specific installation process, the upper end plate screw hole 5 on the upper pipe pile end plate 3 is first passed through the pier head, and then the upper pipe pile end plate 3 is rotated so that the position of the pier head is turned to the position of the upper end plate main rib hole 4, and then the upper pipe pile end plate 3 is locked and fixed by the pier head.

[0030] Furthermore, a threaded section 602 is processed in the middle of the connector 6, and both ends of the threaded section 602 are optical axis sections 601, and the lengths of the optical axis sections 601 at both ends are different; the threaded section 602 is connected to the corresponding upper end plate screw hole 5 through threaded matching, and the optical axis section 601 is matched with the pipe pile reserved hole 12. The above connector 6 can simultaneously connect the adjacent upper pipe piles 1 and lower pipe piles 17.

[0031] Furthermore, the pipe pile reserved hole 12 is reserved and formed by means of the pull head plate 13 and the bolt assembly 15 when the upper pipe pile 1 and the lower pipe pile 17 are cast. The above-mentioned forming method ensures that the connection member 6 can be installed later.

[0032] Furthermore, the pull head plate 13 is processed with a pull head plate screw hole 14 for matching with the corresponding upper end plate screw hole 5 or lower end plate screw hole 8; the bolt assembly 15 includes a common bolt 15-a and an extended bolt 15-b, and the common bolt 15-a and the extended bolt 15-b are staggeredly installed on the pull head plate screw hole 14. Through the cooperation of the pull head plate screw hole 14 and the bolt assembly 15, the tensioning of the upper pipe pile prestressed steel bar 2 and the lower pipe pile prestressed steel bar 10 is guaranteed during the forming process of the upper pipe pile 1 and the lower pipe pile 17, and it is convenient to form the pipe pile reserved hole 12 through the extended bolt 15-b during the pouring process.

[0033] Furthermore, a tension bolt 16 is provided at the center of the pull head plate 13. The tension bolt 16 facilitates tensioning of the prestressed steel bar during the pipe pile forming process.

[0034] Furthermore, the length of the ordinary bolt 15-a is the sum of the thicknesses of the upper pipe pile end plate 3 and the pull head plate 13, and it does not extend into the pipe pile concrete; the length of another extended bolt 15-b is greater than the sum of the thicknesses of the upper pipe pile end plate 3 and the pull head plate 13, and the part extending into the pipe pile concrete has no threads and is a smooth rod; through the above-mentioned size matching, on the one hand, the pull head plate 13 can be fixed to the corresponding upper pipe pile end plate 3 or lower pipe pile end plate 9, and on the other hand, it is convenient to form a pipe pile reserved hole 12 inside the pipe pile concrete.

[0035] Furthermore, after the upper pipe pile 1 and the lower pipe pile 17 are formed, the pull head plate 13, the ordinary bolts 15-a and the lengthened bolts 15-b are removed, and the pipe pile reserved holes 12 are formed at the casting positions of the lengthened bolts 15-b. The travel pipe pile reserved holes 12 facilitate the positioning and installation of the subsequent connectors 6.

[0036] Embodiment 2: A construction method for a high-strength concrete pipe pile connection reinforcement device comprises the following steps: Step 1: Install the prestressed steel bars 2 of the upper pipe pile, and make upsetting treatment on both ends. The upsetting head passes through the screw hole 5 of the upper end plate, rotate the upper pipe pile end plate 3, and the upsetting head enters the main reinforcement hole 4 of the upper end plate; Step 2: Use ordinary bolts 15-a and extended bolts 15-b to cross-bolt the upper pipe pile end plate 3 and the pull head plate 13; Step 3: Cast, tension, maintain and shape the prefabricated pipe piles, remove the pull head plate 13 and the bolt assembly 15 after shaping, and then fix the pipe pile end plate 3 and the reserved pipe pile hole 12 at the end of the pipe pile; then transport the qualified pipe piles to the construction site; Step 4: Use a diesel hammer to sink the first pipe pile, and bolt the connector 6 to the reserved hole 12 of the pipe pile to be installed; Step 5: Fill the reserved hole 12 of the pipe pile to be extended with an appropriate amount of high-strength mortar, hoist the pipe pile to be installed, and then insert the exposed smooth rod of the connector 6 into the reserved hole 12 of the pipe pile to be extended; Step 6, cleaning the lower pipe pile end plate 9 of the pipe pile to be connected and the upper pipe pile end plate 3 of the pipe pile to be installed, and welding the lower pipe pile end plate 9 and the upper pipe pile end plate 3 of the two pipe piles; Step seven, repeat steps five to six to complete the sinking of the pipe pile in the hole.

Claims

1. A high-strength concrete pipe pile connection reinforcement device, characterized in that: It comprises an upper pipe pile end plate (3) fixed to the end of the upper pipe pile (1) through the upper pipe pile prestressed steel bar (2); It also includes a lower pipe pile end plate (9) fixed to the end of the lower pipe pile (17) through the lower pipe pile prestressed steel bar (10); The upper pipe pile end plate (3) is processed with an upper end plate main reinforcement hole (4) for passing the upper pipe pile prestressed steel bar (2), and the upper end plate main reinforcement hole (4) is connected to the side thereof with an upper end plate screw hole (5); A lower end plate main reinforcement hole (7) through which the lower pipe pile prestressed reinforcement (10) passes is processed on the lower pipe pile end plate (9), and a lower end plate screw hole (8) is provided on the side of the lower end plate main reinforcement hole (7); The ends of the upper pipe pile (1) and the lower pipe pile (17) are provided with pipe pile reserved holes (12), and the positions of the pipe pile reserved holes (12) correspond to the upper end plate screw holes (5) and the lower end plate screw holes (8) respectively; The upper pipe pile (1) and the lower pipe pile (17) are fixedly connected via a plurality of sets of connecting pieces (6). The connecting pieces (6) are correspondingly positioned between the pipe pile reserved holes (12) of the upper pipe pile (1) and the lower pipe pile (17), and pass through the upper end plate screw holes (5) and the lower end plate screw holes (8) in sequence.

2. A high-strength concrete pipe pile connection reinforcement device according to claim 1, characterized in that: The ends of the upper pipe pile prestressed steel bars (2) and the lower pipe pile prestressed steel bars (10) are respectively subjected to upsetting treatment to form pier heads.

3. A high-strength concrete pipe pile connection reinforcement device according to claim 2, characterized in that: The diameter of the pier head is larger than the inner diameter of the corresponding main reinforcement hole (4) of the upper end plate and the main reinforcement hole (7) of the lower end plate; The diameter of the pier head is smaller than the inner diameter of the corresponding upper end plate screw hole (5) and lower end plate screw hole (8).

4. A high-strength concrete pipe pile connection reinforcement device according to claim 3, characterized in that: A threaded section (602) is processed in the middle of the connecting piece (6), and both ends of the threaded section (602) are optical axis sections (601), and the lengths of the optical axis sections (601) at the two ends are different; the threaded section (602) is connected to the position of the corresponding upper end plate screw hole (5) through threaded matching, and the optical axis section (601) corresponds to the reserved hole (12) of the pipe pile.

5. A high-strength concrete pipe pile connection reinforcement device according to claim 4, characterized in that: The pipe pile reserved hole (12) is reserved and formed by means of a pull head plate (13) and a bolt assembly (15) when the upper pipe pile (1) and the lower pipe pile (17) are cast.

6. A high-strength concrete pipe pile connection reinforcement device according to claim 5, characterized in that: The slider plate (13) is provided with a slider plate screw hole (14) for matching with a corresponding upper end plate screw hole (5) or a lower end plate screw hole (8).

7. The high-strength concrete pipe pile connection reinforcement device according to claim 5, characterized in that: The bolt assembly (15) comprises common bolts (15-a) and lengthened bolts (15-b), and the common bolts (15-a) and lengthened bolts (15-b) are installed alternately on the screw holes (14) of the slider plate; A tension bolt (16) is provided at the center of the slider plate (13).

8. The high-strength concrete pipe pile connection reinforcement device according to claim 7, characterized in that: The length of the ordinary bolt (15-a) is the sum of the thicknesses of the upper pipe pile end plate (3) and the pull head plate (13), and does not extend into the pipe pile concrete; the length of the other extended bolt (15-b) is greater than the sum of the thicknesses of the upper pipe pile end plate (3) and the pull head plate (13), and the portion extending into the pipe pile concrete has no threads and is a smooth rod.

9. The high-strength concrete pipe pile connection reinforcement device according to claim 7, characterized in that: After the upper pipe pile (1) and the lower pipe pile (17) are formed, the pull head plate (13), the ordinary bolts (15-a) and the lengthened bolts (15-b) are removed, and a pipe pile reserved hole (12) is formed at the casting position of the lengthened bolts (15-b).

10. A construction method for a high-strength concrete pipe pile connection reinforcement device according to any one of claims 7 to 9, characterized in that: The following steps are involved: Step 1: The upper pipe pile prestressed steel bar (2) is installed and both ends are subjected to upsetting treatment. The upsetting head passes through the screw hole (5) of the upper end plate. The upper pipe pile end plate (3) is rotated and the upsetting head enters the main reinforcement hole (4) of the upper end plate. Step 2: Using ordinary bolts (15-a) and extended bolts (15-b) to cross-bolt the upper pipe pile end plate (3) and the pull head plate (13); Step 3: Casting, tensioning, curing and forming the prefabricated pipe piles, and after forming, remove the pull head plate (13) and the bolt assembly (15), and then fix the pipe pile end plate (3) and the reserved pipe pile holes (12) at the end of the pipe pile; then transport the qualified pipe piles to the construction site; Step 4: Use a diesel hammer to sink the first pipe pile, and bolt the connector (6) to the reserved hole (12) of the pipe pile to be installed; Step 5, fill a proper amount of high-strength mortar into the reserved hole (12) of the pipe pile to be extended, hoist the pipe pile to be installed, and then insert the exposed smooth rod of the connecting piece (6) into the reserved hole (12) of the pipe pile to be extended; Step 6, cleaning the lower pipe pile end plate (9) of the pipe pile to be connected and the upper pipe pile end plate (3) of the pipe pile to be installed, and welding the lower pipe pile end plate (9) and the upper pipe pile end plate (3) of the two pipe piles; Step seven, repeat steps five to six to complete the sinking of the pipe pile in the hole.

Images