Anchor rod static pressure steel pipe pile and pipe-following pile pressing combined construction structure

Abstract

The invention belongs to the technical field of building construction, and particularly relates to an anchor rod static pressure steel pipe pile and pipe-following pile pressing combined construction structure which comprises a walking mechanism arranged on the upper surface of an indoor terrace and a pile machine tower, the walking mechanism is used for walking on the indoor terrace, and a pile machine platform is arranged on the upper surface of the walking mechanism; the pile machine tower is longitudinally connected to the left side wall of the pile machine platform, the left side of the pile machine tower is connected with a lifting system, the lifting end of the lifting system is connected with a top drive type power head, the lower side of the top drive type power head is connected with a drill rod section, and an anchor rod static pressure steel pipe pile section is arranged outside the drill rod section. A pipe-following drill bit is arranged at the bottom end of the anchor rod static pressure steel pipe pile section. According to the design, through research and innovation, under the condition that an original building (structure) cannot provide enough pile pressing counterforce, the anchor rod static pressure steel pipe pile is pressed to the depth meeting the design requirement in a pipe-following drilling pile pressing mode, and meanwhile the influence degree of pile pressing on the surrounding environment is reduced to the minimum.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a combined construction structure of an anchor static pressure steel pipe pile and a follower pipe pressure pile. Background Art

[0002] Anchor static pressure piles are a type of pile foundation formed by combining anchor rods and pile pressure technology. During construction, anchor rods are buried on the foundation to fix the pile pressure frame. The deadweight load that the building can exert (or additional counterweights, pull-out piles, etc.) is used as the pile pressure reaction force. The pile sections are pressed into the foundation section by section through the pile pressure holes reserved (or excavated) in the foundation using a jack, and then the pile head and the foundation are cast together to increase the bearing capacity of the overall foundation. Anchor static pressure piles can be used for foundation underpinning, and the construction equipment is small, so they can be constructed in narrow spaces. They are often used in house rectification and reinforcement projects in soft soil areas such as Shanghai and Tianjin. Since some protective buildings (structures) were built a long time ago and have weak foundations, they cannot provide pile pressure reaction force for anchor static pressure piles; the construction of some anchor static pressure piles near subways and important buildings will have an impact on subways and important buildings due to their soil squeezing effect, and measures need to be taken to reduce or eliminate the soil squeezing effect caused by pile pressure; in some workshops, factories or indoors with low clearance and inaccessible to large equipment, newly added anchor static pressure piles cannot provide pile pressure reaction force by methods such as stacking, counterweights, and pre-buried anchors in the foundation.

[0003] In the prior art, for the grouting steel pipe pile foundation reinforcement body and its construction method, its structure is as follows Figure 3 , Figure 4 The specific steps are:

[0004] Construction preparation: pile holes are reserved in advance on the base plate 100, and anchor holes are embedded in the base plate 100 around the pile holes.

[0005] Install the pile pressure reaction frame 400: insert the static pile anchor rod 15 into the anchor rod hole and fix it. The static pile anchor rod 15 and the pile pressure reaction frame 400 are anchored by bolts or direct welding. The lateral support 200 is limited and placed on the pile pressure reaction frame 400 with two rows of upper and lower pins to form a gate-shaped frame system. The lateral support 200 is hung under the top plate 112 through the electric hoist 18, so that the height of the lateral support 200 can be adjusted by the electric hoist 18. After the height of the lateral support 200 is adjusted to the right position, the pin is inserted into the pin hole 121 on the vertical support 111 at the corresponding position to limit the lateral support 200.

[0006] Lift the pile section 300 into position in the pile hole: transport the anchor static pressure pile to the vicinity of the pile pressing position, use an electric hoist to lift the pile and manually deliver the pile to the pile pressing hole.

[0007] Pile pressing: After the pile section 300 is in place, the electric hoist 18 is used to place the jack 19 at the top of the pile section 300 and below the lateral support 200. The jack 19 is started to slowly push the pile section 300 into the soil. The verticality of the pile section 300 is constantly checked during the construction process. During the construction process, the pressure gauge reading of the anchor static pressure steel pipe pile into the soil is recorded.

[0008] Pile connection: When using casing joints to connect piles, the upper and lower pile sections 300 must be in full contact in the casing joint, and the welding between the casing joint and the pile section 300 must be full.

[0009] Pile grouting: After all anchor static pressure steel pipe piles are sunk, the pile pressure reaction frame 400 is removed from the static pressure pile anchor 15, and the static pressure pile anchor 15 and the anchor bar 16 on the top of the steel pipe pile are connected together by connecting bars, and concrete is poured into the steel pipe pile for grouting.

[0010] Sealing the piles: After the grouting of the steel pipe piles is completed, the sealing construction of the steel pipe pile heads is carried out.

[0011] The existing anchor static pressure pile construction technology mainly uses the deadweight of the building (or additional counterweight, setting of pull-out piles, etc.) to provide the pile pressure reaction force for pile pressing.

[0012] Some protective buildings (structures) are built a long time ago and have weak foundations, which cannot provide pile pressure reaction force for anchor static pressure piles; some anchor static pressure pile construction near subways and important buildings will have an impact on subways and important buildings due to its soil squeezing effect, so measures need to be taken to reduce or eliminate the soil squeezing effect caused by pile pressure; in some workshops, factories or indoors with low clearance and inaccessible to large equipment, newly added anchor static pressure piles cannot provide pile pressure reaction force by methods such as stacking, counterweights, and pre-buried anchors in the foundation, and the existing anchor static pressure pile construction technology will not be able to achieve pile pressure. Summary of the invention

[0013] The purpose of the present invention is to provide an anchor static pressure steel pipe pile and a combined construction structure of a pipe pressure pile to solve the problems mentioned in the above background technology that some protective buildings (structures) are built a long time ago and have weak foundations, and cannot provide pile pressure reaction force for anchor static pressure piles; some anchor static pressure pile construction near subways and important buildings will affect the subways and important buildings due to their soil squeezing effect, and measures need to be taken to reduce or eliminate the soil squeezing effect caused by pile pressure; in some workshops, factories or indoors with low clearance and inaccessible to large equipment, newly added anchor static pressure piles cannot provide pile pressure reaction force by methods such as stacking, counterweights, and pre-buried anchor rods in the foundation, and the existing anchor static pressure pile construction technology will not be able to achieve pile pressure.

[0014] To achieve the above purpose, the present invention provides the following technical solution: an anchor static pressure steel pipe pile and a pipe pressure pile combined construction structure, comprising:

[0015] A walking mechanism is arranged on the upper surface of the indoor floor, the walking mechanism is used for walking on the indoor floor, and a pile driver platform is arranged on the upper surface of the walking mechanism;

[0016] A pile driver tower, wherein the pile driver tower is longitudinally connected to the left side wall of the pile driver platform, a lifting system is connected to the left side of the pile driver tower, a top drive power head is connected to the lifting end of the lifting system, a drill rod section is connected to the lower side of the top drive power head, an anchor static pressure steel pipe pile section is arranged outside the drill rod section, a follow-up drill bit is arranged at the bottom end of the anchor static pressure steel pipe pile section, and the follow-up drill bit is connected to the bottom end of the drill rod section.

[0017] Preferably, legs are provided at four corners of the upper surface of the pile driver platform, the legs penetrate the pile driver platform and extend downward, and the bottom ends of the legs are supported on the indoor floor.

[0018] Preferably, a power system is provided on the upper surface of the pile driver platform.

[0019] Preferably, an oblique brace is connected between the right side wall of the pile driver tower and the pile driver platform.

[0020] Preferably, a cross beam is provided at the top of the pile driver tower, and the top of the lifting system is connected to the lower surface of the cross beam.

[0021] Preferably, the anchor static pressure steel pipe pile section is provided with multiple sections, and two adjacent sections of the anchor static pressure steel pipe pile section are connected by an outer sleeve steel pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Through research and innovation, this design uses the method of following pipe drilling to press the anchor static steel pipe piles to the required depth when the original building (structure) cannot provide sufficient pile pressure reaction force, while minimizing the impact of pile pressure on the surrounding environment.

[0024] The drilling and soil extraction methods of this design can be divided into dry soil extraction and wet soil extraction. The drill rod used in dry soil extraction is a long spiral drill rod, which transports soil to the ground through the rotation of the long spiral, and the construction site is relatively clean; wet soil extraction uses mud replacement to turn the original soil into mud, and then transports the mud to the mud pool through the diversion pipe, and then transports the high-quality mud to the bottom of the hole through the mud pump and drill rod, and repeats the cycle. This method has a certain impact on the working environment.

[0025] In order to improve the single pile bearing capacity of the anchor static pressure steel pipe pile, a grouting pipe can be set at the pile end for pile end grouting, or a grouting hole can be opened on the side wall of the anchor static pressure steel pipe pile for pile side grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 Schematic diagram of the left view structure;

[0028] Figure 3 It is a structural schematic diagram of the prior art;

[0029] Figure 4 It is a structural schematic diagram of structures such as a pile pressure reaction frame in the prior art.

[0030] In the figure: 1-crossbeam, 2-lifting system, 3-top drive power head, 4-outer steel pipe, 5-drill rod section, 6-anchor static pressure steel pipe pile section, 7-outrigger, 8-follow-pipe drill bit, 9-pile driver tower, 10-diagonal support rod, 11-power system, 12-pile driver platform, 13-travel mechanism, 14-indoor floor. DETAILED DESCRIPTION

[0031] The following will be combined with the 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 without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1-2 The present invention provides a technical solution: a combined construction structure of anchor static pressure steel pipe piles and follow-up pipe pressure piles, comprising:

[0035] A walking mechanism 13 is arranged on the upper surface of an indoor floor 14, and the walking mechanism 13 is used for walking on the indoor floor 14. A pile driver platform 12 is arranged on the upper surface of the walking mechanism 13;

[0036] A pile driver tower 9 is longitudinally connected to the left side wall of the pile driver platform 12. A lifting system 2 is connected to the left side of the pile driver tower 9. A top drive power head 3 is connected to the lifting end of the lifting system 2. A drill rod section 5 is connected to the lower side of the top drive power head 3. An anchor static steel pipe pile section 6 is arranged outside the drill rod section 5. A follow-up drill bit 8 is arranged at the bottom end of the anchor static steel pipe pile section 6. The follow-up drill bit 8 is connected to the bottom end of the drill rod section 5.

[0037] The four corners of the upper surface of the pile driver platform 12 are provided with legs 7, which penetrate the pile driver platform 12 and extend downward, and the bottom ends of the legs 7 are supported on the indoor floor 14. The upper surface of the pile driver platform 12 is provided with a power system 11. A diagonal brace 10 is connected between the right side wall of the pile driver tower 9 and the pile driver platform 12. A crossbeam 1 is provided at the top of the pile driver tower 9, and the top end of the lifting system 2 is connected to the lower surface of the crossbeam 1. The anchor static steel pipe pile section 6 is provided with multiple sections, and two adjacent sections of the anchor static steel pipe pile section 6 are connected by an outer jacket steel pipe 4.

[0038] The specific construction process of this scheme is as follows:

[0039] Step 1: Construction preparation: Measure and locate on the indoor floor 14 according to the design drawings to determine the location of the pile hole. Dig out the pile hole according to the diameter of the anchor static pressure steel pipe pile. Start the walking mechanism 13 to move the pile driver to the vicinity of the pile hole, and adjust the pile driver so that the center of the top drive power head 3 is aligned with the center of the pile hole.

[0040] Step 2: Install the drill rod and anchor static pressure steel pipe piles: place the follow-pipe drill bit 8 into the pile hole, connect the drill rod section 5 and the follow-pipe drill bit 8, and the connection form is a pin connection; at the same time, place the static pressure anchor pile section 6 on the top of the follow-pipe drill bit 8, and the drill rod section 5 is inserted into the static pressure anchor pile section 6.

[0041] Step 3: Start the lifting system 2 to lower the top drive power head 3 to the top of the drill rod section 5, and connect and fix it with the bolt of the drill rod section 5. Start the top drive power head 3 to rotate, drive the drill rod section 5 and the pipe drill bit 8 to rotate, and the reaming blades on the pipe drill bit 8 open. At the same time, the lifting system 2 pressurizes downward, and the pipe drill bit 8 cuts and extracts soil, drills, and sinks. The static anchor pile section 6 sinks together with the pipe drill bit 8. The soil cut out by the pipe drill bit 8 is discharged to the ground through the top of the static anchor pile section 6.

[0042] Step 4: When the drill rod section 5 and the static anchor pile section 6 sink to the vicinity of the hole mouth, start and stop the lifting system 2, remove the pin between the top drive power head 3 and the drill rod section 5, and separate the top drive power head 3 from the drill rod section 5; start the lifting system 2, lift the top drive power head 3; install the next drill rod section 5 and static anchor pile section 6. The upper and lower sections of the drill rod section 5 are connected by pins; the upper and lower sections of the static anchor pile section 6 are connected by casing joints. The upper and lower pile sections 6 must be completely in contact in the casing joint, and the welding between the casing joint and the pile section 6 is full.

[0043] Step 5: Repeat steps 3 and 4 until the bottom end of the anchor static pressure pile section 6 completely reaches the designed depth.

[0044] Step 6: The top drive power head 3 rotates in the opposite direction to retract the hole expansion blades on the pipe drill bit 8 to their original state. The lifting system 2 is started to lift the pipe drill bit 8 and the drill rod section 5 from the static anchor pile section 6 to the surface one by one. The traveling mechanism 13 is started to move the pile driver to the next hole position.

[0045] Step 7: Lower the steel cage into the completed static anchor pile section 6, pour concrete, and seal the hole.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined construction structure of anchor static pressure steel pipe piles and pipe pressure piles, characterized in that: include: A walking mechanism (13) is arranged on the upper surface of an indoor floor (14), the walking mechanism (13) is used for walking on the indoor floor (14), and a pile driver platform (12) is arranged on the upper surface of the walking mechanism (13); A pile driver tower (9) is longitudinally connected to the left side wall of a pile driver platform (12); a lifting system (2) is connected to the left side of the pile driver tower (9); a lifting end of the lifting system (2) is connected to a top drive power head (3); a drill rod section (5) is connected to the lower side of the top drive power head (3); an anchor static steel pipe pile section (6) is arranged outside the drill rod section (5); a follow-up drill bit (8) is arranged at the bottom end of the anchor static steel pipe pile section (6); and the follow-up drill bit (8) is connected to the bottom end of the drill rod section (5).

2. The combined construction structure of anchor static pressure steel pipe pile and pipe pressure pile according to claim 1 is characterized by: The four corners of the upper surface of the pile driver platform (12) are each provided with a support leg (7), the support leg (7) penetrates the pile driver platform (12) and extends downward, and the bottom end of the support leg (7) is supported on the indoor floor (14).

3. The combined construction structure of anchor static steel pipe pile and pipe pressure pile according to claim 1 is characterized by: A power system (11) is arranged on the upper surface of the pile driver platform (12).

4. The combined construction structure of anchor static pressure steel pipe pile and pipe pressure pile according to claim 1 is characterized by: An oblique support rod (10) is connected between the right side wall of the pile driver tower (9) and the pile driver platform (12).

5. The combined construction structure of anchor static pressure steel pipe pile and pipe pressure pile according to claim 1 is characterized by: A crossbeam (1) is arranged at the top end of the pile driver tower (9), and the top end of the lifting system (2) is connected to the lower surface of the crossbeam (1).

6. The combined construction structure of anchor static pressure steel pipe pile and pipe pressure pile according to claim 1 is characterized by: The anchor rod static pressure steel pipe pile section (6) is provided with a plurality of sections, and two adjacent sections of the anchor rod static pressure steel pipe pile section (6) are connected via an outer sleeve steel pipe (4).

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