High-strength bare rock lead hole embedded steel bar anchoring steel pipe pile and construction method

Abstract

According to the high-strength bare rock guide hole embedded steel bar anchoring steel pipe pile and the construction method, concrete is pre-poured on the lower portion of the steel pipe pile, a plurality of grouting pipes are arranged, the floating problem of the steel pipe pile during side wall grouting construction is effectively prevented, the overall operation is simple and convenient, the grouting construction quality is guaranteed, one-time grouting is completed, and the construction efficiency is improved; the problem that the steel pipe pile is difficult to enter the rock on the inclined rock surface is effectively solved by means of underwater drilling blasting auxiliary hole-forming construction, the construction efficiency is improved, the construction period is shortened, and the overall construction quality of the steel pipe pile is improved on the basis of ensuring safety and reliability; the guide steel pipe is additionally arranged at the tail of the drill bit, and the spiral strip is mounted on the outer wall of the guide steel pipe, so that steel pipe pile construction accuracy is improved, abrasion of the lower steel pipe and the inner wall of the steel pipe pile is avoided, and steel pipe pile construction quality meets design and specification requirements.

Description

Technical Field

[0001] The invention relates to the field of marine environment steel pipe pile construction, in particular to high-strength bare rock hole-planting and anchoring steel pipe piles and a construction method. Background Art

[0002] With the growth of traffic demand, the increase of bridge span and the increase of foundation water depth, the form of bridge foundation structure is changing with each passing day, from the initial caisson and caisson foundation to pipe column foundation, pile foundation, and then to various combination foundations and special foundations. Pile foundation is widely used in my country. During the construction process, it often faces problems such as harsh construction environment and complex construction technology. The environment and geological conditions of the sea area are very changeable, which has a great impact on the actual construction. In the current cross-river and sea bridge construction projects, steel trestles and steel platforms are widely used. The riverbed covered with high-strength rock formations in the sea area, the traditional steel pipe pile construction technology cannot penetrate into the riverbed and cannot meet the requirements of steel pipe pile pull-out bearing capacity and penetration. At the same time, there are also problems such as unstable foundation construction and difficult to control construction accuracy during the construction process. Therefore, it is of great practical significance to study the high-strength bare rock lead-in hole planting steel pipe pile anchoring and construction methods. Summary of the invention

[0003] The object of the present invention is to provide a high-strength bare rock hole-planting steel pipe anchoring pile and a construction method for solving the above-mentioned technical problems.

[0004] In order to solve the above technical problems, the present invention provides a construction method for high-strength bare rock hole planting and anchoring steel pipe piles, comprising the following steps:

[0005] S1. First, a steel casing is sunk at the construction location to pass through the overburden layer, and the bottom of the steel casing is embedded in the rock layer. Then, before the steel pipe pile is lowered, the first grouting pipe is arranged on the outside and inside of the pile wall, and concrete is pre-cast at the bottom of the steel pipe pile. Then, the steel pipe pile is lowered into the pile hole, and finally, the first grouting pipe is used to perform a one-time continuous grouting operation on the bottom reserved cavity and the gap area of ​​the pile side wall;

[0006] S2. When an inclined rock surface appears in the waters near the shore, the working boat is anchored on the water surface of the designated construction area. First, the location is measured and the core drilling operation is performed on the inclined rock surface at the external conduit and the blasting hole. Then, the external conduit, PVC pipe and waterproof sealing material are installed together and lowered and fixed using the working platform on the working boat. Then, the explosives and detonators are tied together into a string using plastic lashing ropes, and counterweights are arranged at the bottom of the string explosives. After the string explosives are made, they are lowered into place through ropes and detonating cords for blasting operations, and then the punching drill is used to continue the hole drilling construction;

[0007] S3. When constructing steel pipe piles under the water surface, a guide steel pipe is installed at the tail of the drill bit, and a spiral strip is set on the outer wall of the guide steel pipe. Then the drill bit is installed at the lower part of the drill rod, and the drill bit is placed in the steel pipe pile. Finally, the drilling rig is started to perform the hole-forming operation;

[0008] S4. When the steel pipe pile is constructed to the deep-water high-strength bare rock area, first use a drilling rig to drill and core the steel pipe pile to form a reinforcement hole, then place the I-beam as an anchor into the reinforcement hole, then install the second grouting pipe and the acoustic detection pipe into the reinforcement hole, and inject cement slurry into the reinforcement hole until it reaches the rock surface. Finally, pour concrete in the upper space of the rock surface of the steel pipe pile to form a stable anchoring system with the rock layer, I-beam and steel pipe pile.

[0009] The beneficial effects of the present invention are:

[0010] (1) By pre-casting concrete at the bottom of the steel pipe pile and arranging multiple grouting pipes, the problem of steel pipe pile floating during side wall grouting construction is effectively prevented. The overall operation is simple, the grouting construction quality is guaranteed, and the one-time grouting is completed to improve the construction efficiency;

[0011] (2) With the help of underwater drilling and blasting to assist hole construction, the problem of difficulty in inserting steel pipe piles into the rock on the inclined rock surface was effectively solved, which improved the construction efficiency, shortened the construction period, and improved the overall construction quality of steel pipe piles on the basis of ensuring safety and reliability;

[0012] (3) By adding a guide steel pipe at the tail of the drill bit and installing spiral strips on the outer wall of the guide steel pipe, the accuracy of steel pipe pile construction is improved, while avoiding wear between the lower steel pipe and the inner wall of the steel pipe pile, so that the construction quality of the steel pipe pile meets the design and specification requirements;

[0013] (4) A drilling machine is used to drill and core the steel pipe pile to form a reinforcement hole. After the hole is formed, an I-beam is placed in the hole as an anchor bar and grouting is performed to consolidate the hole. This solves the problem that the steel pipe pile is not deep enough into the rock and the bearing capacity cannot be guaranteed. The overall safety and reliability are enhanced, and the supporting stability of the steel pipe pile is also enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of floating control technology for implanted rock-embedded steel pipe piles;

[0015] Figure 2 Schematic diagram of underwater blasting hole-forming technology on inclined rock surface;

[0016] Figure 3 Schematic diagram of underwater blasting explosive structure;

[0017] Figure 4 Schematic diagram of underwater blasting hole layout;

[0018] Figure 5 Schematic diagram of the guide steel pipe impact drilling technology;

[0019] Figure 6 Schematic diagram of drilling and coring for the I-beam;

[0020] Figure 7 Schematic diagram of I-beam grouting and anchoring construction;

[0021] Figure 8 Schematic diagram of the I-beam anchoring technology using holes to embed the anchor holes.

[0022] Description of the accompanying drawings: 1-steel casing, 2-steel pipe pile, 3-first grouting pipe, 4-covering layer, 5-head plate, 6-precast concrete, 7-rock layer, 8-reserved cavity, 9-cavity slurry outlet, 10-No. 1 slurry outlet, 11-No. 2 slurry outlet, 12-No. 3 slurry outlet, 13-No. 4 slurry outlet, 14-slurry, 15-water surface, 16-operation boat, 17-operation platform, 18-external conduit, 19-water bank, 20-inclined rock surface, 21-PVC pipe, 22 - waterproof sealing material, 23-explosives, 24-plastic tying rope, 25-rope, 26-detonator, 27-detonating cord, 28-counterweight, 29-position of steel pipe pile, 30-blasting hole, 31-sealing cover, 32-drill rod, 33-drill bit, 34-spiral strip, 35-guide steel pipe, 36-lower rock mass, 37-water body, 38-rock surface, 39-rebar embedding hole, 40-I-beam, 41-sonic detection tube, 42-second grouting pipe, 43-cement slurry, 44-concrete. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying 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 belong to the scope of protection of the present invention.

[0024] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0026] like Figure 1-Figure 8 The present invention provides a high-strength bare rock hole-planting steel pipe anchoring pile and a construction method, comprising the following steps:

[0027] S1. First, a steel casing 1 is sunk at the construction position to pass through the covering layer 4. The bottom of the steel casing 1 is embedded in the rock layer 7 to provide construction protection for the steel pipe pile 2. Then, before the steel pipe pile 2 is lowered, the first grouting pipe 3 is arranged on the outside and inside of the pile wall respectively, and concrete 6 is pre-cast at the bottom of the steel pipe pile 2. Then, the steel pipe pile 2 is lowered into the pile hole, and the construction position is checked and fixed. Finally, the first grouting pipe 3 is used to perform a one-time continuous grouting operation 14 on the bottom reserved cavity 8 and the gap area of ​​the pile side wall. During the initial grouting, the No. 3 grouting port 12 is used for continuous operation. When the pipe is blocked or the pressure is abnormal, the No. 1 grouting port 10 / No. 2 grouting port 11 / No. 4 grouting port 13 is immediately replaced for grouting operation. When the grouting material 14 fills the construction gap to meet the requirements, the subsequent steel pipe pile 2 construction steps are carried out.

[0028] like Figure 1 As shown, when the steel pipe pile 2 is constructed on the water bank, a steel casing 1 is first arranged on the outside for protection, a reserved cavity 8 with a height of 35 cm is arranged at the bottom of the steel pipe pile 2, and cavity outlets 9 are symmetrically arranged on both sides of the reserved cavity 8, three first grouting pipes 3 are arranged on the inside of the steel pipe pile 2, and one first grouting pipe 3 is arranged on the outside, and when the steel pipe pile 2 is planted, a one-time continuous grouting material 14 operation is performed on the bottom reserved cavity 8 and the pile side wall to improve the integrity between the steel pipe pile 2 and the rock layer 7, and the first grouting pipe 3 is fixed inside the steel pipe pile 2 with the help of a head plate 5.

[0029] Wherein, a proper amount of quick-setting agent is added to the slurry 14 during preparation, so that the slurry 14 can solidify in a relatively short time after the pouring construction, thereby reducing the effect of grouting floating.

[0030] S2. When an inclined rock surface 20 appears in the waters near the waterside 19, the work boat 16 is driven to anchor on the water surface 15 of the designated construction area. First, the positioning is measured, and the outer guide tube 18 and the inclined rock surface 20 at the blasting hole 30 are cored and drilled using a drilling machine. Subsequently, the outer guide tube 18, the PVC pipe 21 and the waterproof sealing material 22 are installed in combination, and the work platform 17 on the work boat 16 is used to lower them to the designed position and temporarily fix them. Then, the explosives 23 and the detonators 26 are tied together into a string using plastic tying ropes 24, and a counterweight block 28 is arranged at the bottom of the string of explosives 23. After the string of explosives 23 is made, it is lowered into place through the rope 25 and the detonating cord 27. Finally, professional personnel perform blasting operations. After the site is cleared and cleaned, a punching drill is used to continue the hole construction.

[0031] like Figure 2 to Figure 4As shown, when steel pipe pile construction is carried out in the stratum conditions of the inclined rock surface 20 in the water area near the water bank 19, the PVC pipe 21 is placed in the outer conduit 18, and the waterproof sealing material 22 is filled into the cavity at the bottom of the outer conduit 18, and the outer conduit 18 and the PVC pipe 21 are lowered and fixed by using the working platform 17; the bottom of the PVC pipe 21 is sealed with a sealing cover 31 before being lowered; the dosage and operation of the underwater blasting explosive 23 are designed and constructed by professionals in accordance with the specifications to ensure safe operation; the waterproof sealing material 22 can use its own gravity to help the outer conduit 18 and the PVC pipe 21 resist buoyancy while playing a waterproof role.

[0032] The counterweight block 28 arranged at the bottom of the string-shaped explosive 23 can be made from local materials, such as the rock core obtained by drilling.

[0033] S3. When constructing the steel pipe pile 2 under the water surface 15, in order to ensure the construction quality and accuracy, the drill bit 33 of the drilling rig is first optimized and modified, a guide steel pipe 35 is installed at the tail of the drill bit 33, and a spiral strip 34 is welded on the outer wall of the guide steel pipe 35. Then, the optimized and modified drill bit 33 is installed to the lower part of the drill rod 32, and the drill bit 32 is placed in the designated construction position in the steel pipe pile 2. Finally, the drilling rig is started to perform the hole-forming operation. By adding the guide steel pipe 35 and the spiral strip 34, the risk of the guide steel pipe 35 rubbing against the inside of the steel pipe pile 2 during construction is avoided, while ensuring the verticality of the pile hole.

[0034] like Figure 5 As shown, when the steel pipe pile 2 is constructed in the rock mass 36 below the water surface 15, a guide steel pipe 35 is added to the tail of the drill bit 33, and six spiral strips 34 are installed on the outer wall of the guide steel pipe 35 to protect the inner wall of the steel casing 2, and then the drill bit 33 is driven by the drill rod 32 to perform the hole-making operation.

[0035] When the drilling machine performs the hole-forming operation, the guide steel pipe 35 is always kept more than 2.5 m inside the original steel pipe pile 2 .

[0036] S4. When the steel pipe pile 2 is constructed to the deep-water high-strength bare rock area, a drilling rig is first used to drill and core the steel pipe pile 2 to form a reinforcement hole 39, and then an I-beam 40 is placed in the reinforcement hole 39 as an anchor bar, and then a second grouting pipe 42 and an acoustic detection pipe 41 are installed in the reinforcement hole 39, and cement slurry 43 is injected into the reinforcement hole 39 until it reaches the rock surface 38. The acoustic detection pipe 41 is used to check and confirm the grouting quality of the reinforcement hole 39. Finally, when the grouting construction in the reinforcement hole 39 meets the requirements, concrete 44 is poured in the upper space of the rock surface 38 of the steel pipe pile 2, so that the rock layer 7, the I-beam 40, and the steel pipe pile 2 form a stable anchoring system to improve the overall stability of the steel pipe pile 2.

[0037] like Figure 6 to Figure 8As shown, when the steel pipe pile 2 is operated in a high-strength bare rock area in water, it is difficult to meet the depth required for entering the rock layer 7. Therefore, a drilling machine is first used to drill and core the steel pipe pile 2 to form a reinforcement hole 39, and then two I-beams 40 are placed in the reinforcement hole 39 as anchor bars. The stable anchoring system formed by the rock layer 7, the I-beams 40, and the steel pipe pile 2 is used to improve the overall stability and resist the construction load and the load generated by the surrounding water body 37.

[0038] The concrete 44 poured into the upper space of the rock surface 38 of the steel pipe pile 2 is C30 concrete.

[0039] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for high-strength bare rock hole-planting and anchoring steel pipe piles, characterized in that: The following steps are involved: S1, firstly, a steel casing (1) is sunk at a construction location to pass through a covering layer (4), and the bottom of the steel casing (1) is embedded in a rock layer (7). Then, before the steel pipe pile (2) is lowered, a first grouting pipe (3) is arranged on the outside and inside of the pile wall, and concrete (6) is pre-cast at the bottom of the steel pipe pile (2). Then, the steel pipe pile (2) is lowered into the pile hole. Finally, the first grouting pipe (3) is used to perform a one-time continuous grouting operation (14) on the bottom reserved cavity (8) and the gap area on the pile side wall; S2. When an inclined rock surface (20) appears in the waters near the shore (19), the work boat (16) is anchored on the water surface (15) of the designated construction area, and firstly, the measurement and positioning are carried out, and the coring and hole-forming operations are carried out on the inclined rock surface (20) at the external conduit (18) and the blasting hole (30). Subsequently, the external conduit (18), the PVC pipe (21) and the waterproof sealing material (22) are installed in combination, and lowered and fixed using the work platform (17) on the work boat (16). Then, the explosives (23) and the detonators (26) are tied together into a string using a plastic tying rope (24), and a counterweight (28) is arranged at the bottom of the string of explosives (23). After the string of explosives (23) is made, it is lowered into place through the rope (25) and the detonating cord (27) for blasting operations, and then the punching drill is used to continue the hole-forming construction; S3, when constructing the steel pipe pile (2) under the water surface (15), a guide steel pipe (35) is installed at the tail of the drill bit (33), and a spiral strip (34) is arranged on the outer wall of the guide steel pipe (35), then the drill bit (33) is installed at the lower part of the drill rod (32), and the drill bit (32) is placed in the steel pipe pile (2), and finally the drilling machine is started to perform the hole forming operation; S4. When the steel pipe pile (2) is constructed to a deep-water high-strength bare rock area, a drilling machine is first used to drill and core the steel pipe pile (2) to form a reinforcement hole (39), and then an I-beam (40) is placed in the reinforcement hole (39) as an anchor bar. Then, a second grouting pipe (42) and an acoustic detection pipe (41) are installed in the reinforcement hole (39), and cement slurry (43) is injected into the reinforcement hole (39) until it reaches the rock surface (38). Finally, concrete (44) is poured in the upper space of the rock surface (38) of the steel pipe pile (2), so that the rock layer (7), the I-beam (40), and the steel pipe pile (2) form a stable anchoring system.

2. The construction method of high-strength bare rock hole-planting steel pipe pile anchoring according to claim 1 is characterized by: In step S1, during the initial grouting, the No. 3 slurry outlet (12) is preferentially used for continuous operation. When the pipe is blocked or the pressure is abnormal, the No. 1 slurry outlet (10) / No. 2 slurry outlet (11) / No. 4 slurry outlet (13) is replaced for grouting operation.

3. The construction method of high-strength bare rock hole-planting steel pipe pile anchoring according to claim 1 is characterized by: In step S1, a reserved cavity (8) is provided at the bottom of the steel pipe pile (2), and cavity slurry outlets (9) are symmetrically provided on both sides of the reserved cavity (8), and the interior of the steel pipe pile (2) is connected to the first grouting pipe (3) by means of a head plate (5).

4. The construction method of high-strength bare rock hole-planting steel pipe pile anchoring according to claim 1 is characterized by: An accelerating agent is added to the slurry (14) during preparation.

5. The construction method of high-strength bare rock hole-planting steel pipe pile anchoring according to claim 1 is characterized by: In step S2, the PVC tube (21) is placed in the outer conduit (18), and the bottom cavity of the outer conduit (18) is filled with a waterproof sealing material (22); before the PVC tube (21) is lowered, the bottom is sealed with a sealing cover (31).

6. The construction method of high-strength bare rock hole-planting steel pipe pile anchoring according to claim 1 is characterized by: In step S3, the steel pipe pile (2) is constructed in the rock mass (36) below the water surface (15), and six spiral strips (34) are installed on the outer wall of the guide steel pipe (35) to protect the inner wall of the steel casing (2).

7. The construction method of high-strength bare rock hole-planting and anchoring steel pipe piles according to claim 1 is characterized by: In step S4, the concrete (44) is C30 concrete.

8. A high-strength bare rock hole-planting steel pipe anchor pile, characterized in that: The method is constructed according to any one of claims 1 to 7 for high-strength bare rock hole-planting and anchoring steel pipe piles.

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