阅读说明：本技术 一种管桩在密实砂层中的施工设备及施工方法 (Construction equipment and construction method for tubular pile in dense sand layer ) 是由 汪小健 陈家冬 吴亮 胡世林 徐坤 于 2019-10-25 设计创作，主要内容包括：本发明涉及一种管桩在密实砂层中的施工设备及施工方法,其包括第一粘土层、砂土层、第二粘土层,第一黏土层上方设置有施工平台,施工平台上端设置有静压桩机,静压桩机与管桩相联动,第一粘性土上端放置有水箱,水箱外侧固定连接有水泵,水泵连通有输水管,输水管远离水箱的一端连通有射水管。本发明在施工的时候,将管桩与静压桩机相固定,启动静压桩机,当静压桩机联动管桩,使管桩的下端位于砂土层的上端时,将射水管放置到管桩的空腔中,启动水泵,使水泵联动输水管,射水管开始向砂土层内喷水,砂土层内的含水量增加之后,砂土层会出现液化的现象,沉桩时的阻力会减小甚至消失,从而保证管桩在砂土层中能够顺利的沉桩。(The invention relates to a construction device and a construction method of a tubular pile in a dense sand layer, and the construction device comprises a first clay layer, a sand layer and a second clay layer, wherein a construction platform is arranged above the first clay layer, a static pile machine is arranged at the upper end of the construction platform and is linked with the tubular pile, a water tank is arranged at the upper end of the first clay layer, a water pump is fixedly connected to the outer side of the water tank, the water pump is communicated with a water delivery pipe, and one end of the water delivery pipe, far away from the water tank, is communicated with a water jet pipe. When the pile sinking device is used for construction, the tubular pile and the static pile machine are fixed, the static pile machine is started, when the static pile machine is linked with the tubular pile, the lower end of the tubular pile is positioned at the upper end of a sandy soil layer, the water injection pipe is placed in the cavity of the tubular pile, the water pump is started, the water pump is linked with the water delivery pipe, the water injection pipe starts to spray water into the sandy soil layer, the sandy soil layer can be liquefied after the water content in the sandy soil layer is increased, the resistance in pile sinking can be reduced or even eliminated, and therefore the smooth pile sinking of the tubular pile in the sandy soil layer is ensured.)

1. The utility model provides a construction equipment of tubular pile in closely knit sand bed, includes first clay layer (1), sand layer (2), second clay layer (3), first clay layer top is provided with construction platform (4), construction platform (4) upper end is provided with static pressure stake machine (5), static pressure stake machine (5) and tubular pile link mutually, its characterized in that: a water tank (6) is placed at the upper end of the first cohesive soil, a water pump (7) is fixedly connected to the outer side of the water tank (6), the water pump (7) is communicated with a water delivery pipe (8), and one end, far away from the water tank (6), of the water delivery pipe (8) is communicated with a water injection pipe (9).

2. The construction equipment of tubular pile in dense sand layer according to claim 1, characterized in that: the outer side of the water jet pipe (9) is fixedly connected with a miniature high-frequency vibrator (10).

3. The construction equipment of tubular pile in dense sand layer of claim 2, characterized in that: the supporting mechanism (11) linked with the water jet pipe (9) is arranged at the upper end of the first clay layer (1), the supporting mechanism (11) comprises a supporting frame (111) arranged at the upper end of the first clay layer (1), an oil cylinder (112) hinged to the upper end of the supporting frame (111), a supporting arm (113) movably connected with the supporting frame (111), and a steel wire rope (114) connected with the supporting arm (113), the supporting arm (113) comprises a rotating disc (1131) rotatably connected with the supporting frame (111) and a cantilever (1132) hinged to the rotating disc (1131), and a piston rod of the oil cylinder (112) is hinged to the cantilever (1132).

4. The construction equipment of tubular pile in dense sand layer of claim 3, characterized in that: be provided with winding assembly (12) with wire rope (114) looks linkage on cantilever (1132), winding assembly (12) include with cantilever (1132) fixed connection first motor (121), with first motor (121) output end fixed connection's winding roller (122), with cantilever (1132) fixed connection's solid fixed ring (123), wire rope (114) one end and winding roller (122) fixed connection, the other end passes solid fixed ring (123) and extends to the below of cantilever (1132).

5. The construction equipment of tubular pile in dense sand layer of claim 4, characterized in that: wire rope (114) keep away from the one end of winding roller (122) and be provided with fixed subassembly (13), fixed subassembly (13) include with wire rope (114) fixed connection fixed block (131), set up fixed orifices (132) on fixed block (131), fixed connection first fixed plate (133) in fixed orifices (132) inner wall, the lateral wall fixedly connected with second fixed plate (14) of penetrating pipe (9), second fixed plate (14) are the steel sheet, the upper end fixedly connected with magnetic sheet (15) of first fixed plate (133).

6. The construction equipment of tubular pile in dense sand layer of claim 5, characterized in that: be provided with spacing subassembly (16) on cantilever (1132), spacing subassembly (16) include with cantilever (1132) fixed connection's bracing piece (161), with bracing piece (161) fixed connection's limiting plate (162), set up spacing hole (163) on limiting plate (162), wire rope (114) pass from spacing hole (163).

7. A construction method of a tubular pile in a dense sand layer is characterized by comprising the following steps: construction equipment for a tubular pile in a dense sand layer, comprising any one of claims 1 to 6, comprising the steps of:

s1, lifting the pipe pile to the pile position, starting the static pile press (5), and enabling the static pile press (5) to drive the pipe pile to be pressed down into the first clay layer (1);

s2: the pipe pile is sunk into the top surface of the sandy soil layer (2), pile sinking resistance is sharply increased, pile sinking is stopped, and a miniature high-frequency vibrator (10) with a water jetting pipe (9) is hung into the hollow part of the pipe pile to the pile end of the pipe pile, namely the top surface of the sandy soil layer (2);

s3: starting the micro high-frequency vibrator (10) and the water pump (7) to enable the water injection pipe (9) to start water injection, increasing the water pressure in the sandy soil layer (2) by the high-frequency vibration of the micro high-frequency vibrator (10) in the sandy soil layer (2), and continuously performing static pressure pile sinking after the pile sinking resistance disappears after the sandy soil layer (2) generates a liquefaction phenomenon;

s4, continuously adopting a high-frequency vibration water jetting method to sink the pile to the bottom surface of the sand layer in the sand layer (2);

s5: and when pile sinking resistance is increased, namely the pile end is positioned at the top end of the second clay layer (3), stopping pile sinking, lifting the water injection pipe (9) and the miniature high-frequency vibrator (10) along the hollow part of the pipe pile, and continuously sinking the pile to the designed elevation according to a conventional static pressure method.

Technical Field

The invention relates to the technical field of construction of building pile foundations, in particular to construction equipment and a construction method of a tubular pile in a dense sand layer.

Background

The prefabricated pipe pile is widely applied to the pile foundation of high-rise buildings, and static pressure construction is generally adopted in the prior pipe pile construction, namely, the pile is sunk into a designed elevation by utilizing the self weight of a pile machine and a balance weight to overcome pile sinking resistance.

The resistance of the tubular pile during pile sinking is the sum of the pile side resistance and the pile end resistance, when the tubular pile is constructed in a sandy soil layer, the pile sinking resistance is mainly generated by the pile end resistance, particularly when a denser sandy soil layer is met, the pile end resistance is increased sharply, the tubular pile cannot sink continuously, the pile body cracks, the pile head bursts, the pile is lifted on the pile machine and other safety risks are easy to occur.

In order to successfully sink a pile in a sandy soil layer, a method of leading a hole is usually adopted to reduce pile sinking resistance (leading hole construction, namely a long spiral drilling rod with the diameter 50 ~ 100mm smaller than the diameter of the pile is adopted to drill into the soil layer at the pile position, then the soil layer which is drilled loosely is extracted to form a drilled hole, and then a static pressure pile machine is pressed into the tubular pile at the leading hole), the defects of leading hole construction are that 1, common sandy soil layers are all aquifers, when leading the hole in the sandy soil layer, the hole is easy to collapse in the sandy soil layer after the soil in the hole is taken out, the led hole is buried again to cause pile sinking difficulty and soil layer disturbance, 2, the diameter of the drilling rod of a leading hole machine is smaller, when the leading hole is too deep, the drilled hole is easy to bend and incline, the leading hole reduces pile sinking resistance, and the tubular pile is easy to bend and incline along the drilled hole to form quality risks when the.

Disclosure of Invention

The invention provides construction equipment and a construction method of a tubular pile in a dense sand layer, aiming at the characteristic that sandy soil is easy to liquefy in a vibration state, the pile end resistance of the tubular pile during pile sinking is reduced, so that a static pressure tubular pile can successfully sink in the sandy soil layer.

The technical purpose of the invention is realized by the following technical scheme:

the utility model provides a construction equipment of tubular pile in closely knit sand bed, includes first clay layer, sand layer, second clay layer, first clay layer top is provided with construction platform, the construction platform upper end is provided with static pressure stake machine, static pressure stake machine and tubular pile are linked mutually, the water tank has been placed to first cohesive soil upper end, water tank outside fixedly connected with water pump, the water pump intercommunication has the raceway, the one end intercommunication that the water tank was kept away from to the raceway has the injection pipe.

Through adopting above-mentioned technical scheme, in the construction, it is fixed mutually with the static pile machine to construct the tubular pile, start the static pile machine, when the linkage tubular pile of static pile machine, when making the lower extreme of tubular pile be located sand layer's upper end, place the cavity of tubular pile with the injection pipe, start the water pump, make water pump linkage raceway, the injection pipe begins to spray water to the sand in situ, after the intraformational water content of sand increases, liquefied phenomenon can appear in the sand layer, resistance during the pile sinking can reduce or even disappear, thereby guarantee the pile sinking that the tubular pile can be smooth in sand layer.

The invention is further configured to: and the outer side of the water jetting pipe is fixedly connected with a miniature high-frequency vibrator.

Through adopting above-mentioned technical scheme, start miniature high frequency vibration ware when the jetting pipe is penetrated water, miniature high frequency vibration ware can vibrate, can increase the water pressure in the pile tip sand when taking place to vibrate, and when pile tip water pressure was greater than the sand dead weight, pile tip sand can liquefy, and the sand sharply descends the resistance of pile tip to can carry out smooth pile sinking operation.

The invention is further configured to: the supporting mechanism comprises a supporting frame arranged at the upper end of the first clay layer, an oil cylinder hinged to the upper end of the supporting frame, a supporting arm movably connected with the supporting frame, and a steel wire rope connected with the supporting arm, the supporting arm comprises a rotating disc rotatably connected with the supporting frame, and a cantilever hinged to the rotating disc, and a piston rod of the oil cylinder is hinged to the cantilever.

Through adopting above-mentioned technical scheme, when needs will penetrate the water pipe and place the tubular pile inside, make the rolling disc drive the cantilever and rotate to the top of tubular pile, can start the angle that the hydro-cylinder adjusted the cantilever, after the cantilever rotated suitable angle, will penetrate the water pipe and link together with wire rope to utilize wire rope will penetrate the water pipe and place the tubular pile inside, thereby can be smooth will penetrate the water pipe and place the tubular pile in, realize penetrating the water pipe to the water spray of sand layer.

The invention is further configured to: be provided with the winding assembly who links mutually with wire rope on the cantilever, winding assembly include with cantilever fixed connection's first motor, with first motor output fixed connection's winding roller, with cantilever fixed connection's solid fixed ring, wire rope's one end and winding roller fixed connection, the other end passes solid fixed ring and extends to the below of cantilever.

Through adopting above-mentioned technical scheme, can start first motor in the rolling wire rope, first motor can drive the winding roller and rotate, and wire rope can carry out the rolling when the winding roller rotates to can make the facility more of placing of penetrating pipe, in the wire rope displacement, solid fixed ring can carry on spacingly to wire rope, makes wire rope's removal more steady.

The invention is further configured to: the one end that the winding roller was kept away from to wire rope is provided with fixed subassembly, fixed subassembly include with wire rope fixed connection's fixed block, set up fixed orifices, the first fixed plate of fixed connection in the fixed orifices inner wall on the fixed block, the lateral wall fixedly connected with second fixed plate of penetrating the water pipe, the second fixed plate is the steel sheet, the upper end fixedly connected with magnetic sheet of first fixed plate.

Through adopting above-mentioned technical scheme, the injection pipe can with the fixed orifices on the fixed block cooperation of pegging graft, the second fixed plate in the injection pipe outside can be placed in first fixed plate upper end, the magnetic sheet can attract each other with the steel sheet simultaneously, more steady and firm when the injection pipe is placed in the fixed block to wire rope and fixed block can drive the steady moving down of injection pipe, guarantee that the injection pipe can be smooth spray water.

The invention is further configured to: the cantilever is provided with a limiting assembly, the limiting assembly comprises a supporting rod fixedly connected with the cantilever, a limiting plate fixedly connected with the supporting rod and a limiting hole formed in the limiting plate, and the steel wire rope penetrates through the limiting hole.

Through adopting above-mentioned technical scheme, spacing hole on the limiting plate can play spacing effect to wire rope, can guarantee more steady removal of wire rope when wire rope carries out the rolling.

A method for constructing a tubular pile in a dense sand layer, comprising the apparatus of any one of claims 1 to 6, comprising the steps of:

s1, lifting the pipe pile to the pile position, starting a static pile press, and driving the pipe pile to be pressed down into the first clay layer by the static pile press;

s2: the pipe pile is sunk into the top surface of the sandy soil layer, pile sinking resistance is increased sharply, pile sinking is stopped, and a miniature high-frequency vibrator with a water jetting pipe is hung along the hollow part of the pipe pile to the pile end of the pipe pile, namely the top surface of the sandy soil layer;

s3: starting the micro high-frequency vibrator and the water pump to enable the water injection pipe to start water injection, increasing the water pressure in the sand layer by the high-frequency vibration of the micro high-frequency vibrator in the sand layer, and continuously performing static pressure pile sinking after the sand layer generates a liquefaction phenomenon and the pile sinking resistance disappears;

s4, continuously adopting a high-frequency vibration water jetting method to sink the pile to the bottom surface of the sand layer in the sand layer;

s5: and when pile sinking resistance is increased, namely the pile end is positioned at the top end of the second clay layer, stopping pile sinking, lifting a water jet pipe and a miniature high-frequency vibrator along the hollow part of the pipe pile, and continuously sinking the pile to the designed elevation according to a conventional static pressure method.

Through adopting above-mentioned technical scheme, when the tubular pile received sand layer's resistance can't move down, utilize wire rope to place the injection pipe in the inner chamber of tubular pile, start water pump and miniature high frequency vibrator, make the injection pipe spray water to sand layer, pile tip sand water content after the water spray improves, closely knit degree reduces, make the sand liquefaction more easily during high frequency vibration, reduce pile tip pile sinking resistance, the purpose of water spray is to reduce the closely knit degree of sand and make closely knit sand layer liquefaction phenomenon more appear more easily, continue the static pressure pile sinking, realization tubular pile that can be smooth is in closely knit sand layer's pile sinking.

In conclusion, the beneficial technical effects of the invention are as follows:

1. during construction, the tubular pile and a static pile machine are fixed, the static pile machine is started, when the static pile machine is linked with the tubular pile and the lower end of the tubular pile is positioned at the upper end of a sandy soil layer, a water injection pipe is placed in a cavity of the tubular pile, a water pump is started to be linked with a water delivery pipe, the water injection pipe starts to spray water into the sandy soil layer, after the water content in the sandy soil layer is increased, the sandy soil layer can be liquefied, and the resistance during pile sinking can be reduced or even disappeared, so that the tubular pile can be smoothly sunk in the sandy soil layer;

2. the micro high-frequency vibrator can vibrate, the water pressure in the sandy soil at the pile end can be increased when the vibration occurs, when the water pressure at the pile end is greater than the self weight of the sandy soil, the sandy soil at the pile end can be liquefied, and the resistance of the sandy soil to the pile end is sharply reduced;

3. the steel wire rope can drive the water injection pipe to enter the inner cavity of the tubular pile more stably, and the tubular pile is more stably sunk in water injection, so that the tubular pile is smoothly sunk.

Drawings

FIG. 1 is a schematic view of an overall structure for embodying pipe pile construction equipment and a soil layer;

FIG. 2 is a schematic diagram showing a specific structure of the water tank and the supporting mechanism;

FIG. 3 is a schematic view showing a specific structure for embodying the winding assembly;

fig. 4 is a schematic structural diagram for embodying the fixing member.

In the figure, 1, the first clay layer; 2. a sandy soil layer; 3. a second clay layer; 4. a construction platform; 5. a static pile press; 6. a water tank; 7. a water pump; 8. a water delivery pipe; 9. a water jet pipe; 10. a micro high-frequency vibrator; 11. a support mechanism; 111. a support frame; 112. an oil cylinder; 113. a support arm; 1131. rotating the disc; 1132. a cantilever; 1133. a second motor; 114. a wire rope; 12. a winding assembly; 121. a first motor; 122. a winding roller; 123. a fixing ring; 13. a fixing assembly; 131. a fixed block; 132. a fixing hole; 133. a first fixing plate; 14. a second fixing plate; 15. a magnetic plate; 16. a limiting component; 161. a support bar; 162. a limiting plate; 163. and a limiting hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.