WO2022116916A1

WO2022116916A1 - Construction method for pulling out concrete pipe pile on water and pile pulling-out tool

Info

Publication number: WO2022116916A1
Application number: PCT/CN2021/133600
Authority: WO
Inventors: 范御华; 朱珍慧; 张佳鸣; 顾赛华; 周伟宽; 韩照晏
Original assignee: 中交第三航务工程局有限公司; 中交三航局第二工程有限公司
Priority date: 2020-12-01
Filing date: 2021-11-26
Publication date: 2022-06-09

Abstract

A construction method for pulling out a concrete pipe pile on water and a pile pulling-out tool, wherein the construction method comprises the following steps: step one: a pile-driving barge lifts the pile pulling-out tool to the position of a PHC pipe pile such that the position of the pile pulling-out tool matches that of the PHC pipe pile; step two: the pile pulling-out tool is sunk to the bottom elevation of the PHC pipe pile, and lifts an inner sleeve (2) and the PHC pipe pile altogether by means of friction between the inner sleeve (2) and the PHC pipe pile; step three: the pipe pulling-out tool and the PHC pipe pile are lifted ashore by means of a hook of the pile-driving barge; step four: the PHC pipe pile is taken out; and step five: an outer sleeve (1) is pulled out and lifted ashore by means of a vibration hammer, and the inner sleeve and the outer sleeve (2,1) are assembled to pull out the next pile. The pile pulling-out tool lifts the inner sleeve (2) and a single PHC pipe pile by means of friction between the inner sleeve (2) and the PHC pipe pile, and the pile pulling-out tool and the single PHC pipe pile are lifted ashore by means of the hook of the pile-driving barge. The pile pulling-out process is simpler and the pile pulling-out efficiency is high.

Description

A construction method for pulling out concrete pipe piles on water and a pile pulling tool

technical field

The invention relates to the field of pulling out piles on water, in particular to a construction method for pulling out concrete pipe piles on water and a pile pulling tool.

Background technique

The demolition of the wharf includes the removal of the revetment, the removal of a public platform at the rear of the wharf, and the removal of two independent ship piers. PHC (prestressed high-strength concrete) pipe piles need to be removed when the revetment and ship piers are removed. The so-called PHC pipe pile, that is, a prestressed high-strength concrete pipe pile, is a hollow cylindrical concrete prefabricated member made of a pre-tensioned prestressed centrifugal forming process.

Due to the incomplete completion data and geological data of the wharf, especially the completion data of the two ship-side pier piles are missing, and the length of the piles is unknown; in addition, the wharf has been immersed in seawater for more than 20 years, and the welding position of the piles and the quality of the piles will lead to the fracture of the piles. .

In view of this, it is necessary to provide a construction method for pulling out concrete pipe piles on water and a pile pulling tool thereof, so as to improve the efficiency of pulling out the piles and the success rate of pulling out the piles.

SUMMARY OF THE INVENTION

The invention provides a construction method for pulling out concrete pipe piles on water and a pile pulling tool. The inner casing and the PHC pipe pile are lifted together by means of the pile pulling tool and the friction between the inner casing and the PHC pipe pile. The PHC pipe pile pulls out the PHC pipe pile, which has the advantage of high pile pulling efficiency.

The technical scheme that realizes the object of the present invention is as follows:

A construction method for pulling out concrete pipe piles on water, comprising the following steps:

Step 1, the pile pulling tool is hoisted to the position of a PHC pipe pile that needs to pull out the pile by the piling ship, so that the position of the pile pulling tool is consistent with the position of the described one PHC pipe pile;

Step 2, the pile pulling tool is piled to the bottom elevation position of the described PHC pipe pile, and the pile pulling tool relies on the friction force between the inner casing and the PHC pipe pile to lift the inner casing and the PHC pipe pile together;

Step 3. Use the hook of the piling ship to hoist the pile pulling tool and the PHC pipe pile to the shore;

Step 4, take out the PHC pipe pile;

Step 5. Use a vibrating hammer to pull out the outer casing, and then assemble it with the inner casing again after hanging on the shore to pull out the next pile.

The invention uses a pile pulling tool, relies on the friction between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, and uses the hook of the piling ship to hoist the pile pulling tool together with a single PHC pipe pile. Hanging on the shore, the pile pulling process is simpler and the pile pulling efficiency is high.

As a further improvement of the present invention, the step one is specifically:

Step 1.1, measure the PHC pipe pile to obtain the measurement parameters;

Step 1.2. Lift the pile pulling tool to the position of the PHC pipe pile where the pile needs to be pulled out by the piling ship;

Step 1.3. Adjust the position of the pile driver according to the measurement parameters, so that the position of the pile pulling tool is consistent with the position of the PHC pipe pile.

In the present invention, the position of the pile pulling tool is adjusted to the position consistent with the PHC pipe pile before the pile pulling tool drives the pile, so as to facilitate the pile pulling tool to drive the pile and avoid damage to the underlying PHC pipe pile when the pile pulling tool is driving the pile. More conducive to pulling piles.

As a further improvement of the present invention, the measurement parameters in step 1.1 include: the slope of the water-borne concrete pipe pile and the torsion angle of the water-borne concrete pipe pile. As a further improvement of the present invention, in the step 2, the pile pulling tool relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, including:

The PHC pipe pile is located inside the pile pulling tool;

The inner casing and the PHC pipe pile are lifted together by the friction between the inner casing and the PHC pipe pile.

As a further improvement of the present invention, the PHC pipe pile is located inside the pile pulling tool, including:

The pile pulling tool includes an inner casing and an outer casing;

The inner casing and the outer casing and the inner and outer casings are assembled after the installation is completed, and then they are lifted to the top of the PHC pipe pile;

After the measurement and positioning of the inner casing and the outer casing, the inner casing and the outer casing are driven together with an impact hammer to the bottom elevation of the PHC pipe pile, at this time, the PHC pipe pile is inside the inner casing.

As a further improvement of the present invention, the pile pulling tool relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, including:

The bottom surface of the outer casing is provided with a circular ring, and the circular ring is used to prevent the soil from entering the inner casing and the outer casing when the pile is driven, thereby generating friction;

The PHC pipe pile is located inside the inner casing;

As a further improvement of the present invention, relying on the friction force between the inner casing and the PHC pipe pile, the inner casing and the PHC pipe pile are hoisted together, including:

When the pile pulling tool drives the pile to the bottom elevation position of the PHC pipe pile, the inner casing and the outer casing should slightly exceed the bottom of the PHC pipe pile;

When the inner and outer casings are piled to the bottom of the PHC pipe pile, or slightly beyond the bottom of the PHC pipe pile, the friction between the inner casing and the PHC pipe pile is greater than the weight of the PHC pipe pile, the weight of the inner casing, and the PHC pipe pile. The weight of the soil between the inner casing and the inner casing; the inner casing and the PHC pipe pile are lifted together, and the outer casing does not need to be moved at this time.

As a further improvement of the present invention, the step 3 is specifically:

First use the hook of the piling ship to lift out the inner casing together with the PHC pipe pile;

Then pull out the outer casing with a vibrating hammer.

As a further improvement of the present invention, step 5 is further included after step 4: repeating steps 1 to 4 to pull out the next PHC pipe pile.

As a further improvement of the present invention, in the second step, an impact hammer or a vibrating hammer is used to drive the pile pulling tool to the bottom elevation position of the PHC pipe pile.

Lift the pile pulling tool (inner and outer casing) together and hang it into the pile cap of the impact hammer. Since the impact hammer can exert force on the pile pulling tool at the same time, it ensures that the pile pulling tool (inner and outer casing) can be stressed at the same time. , the speed of penetrating the soil is consistent to ensure that the bottom surface of the pile pulling tool (inner and outer casing) is in the same plane when the pile is driven to the bottom elevation position of the PHC pipe pile; Apply force to the pile extraction tool.

A pile pulling tool includes an outer casing and an inner casing, the bottom end of the outer casing is provided with a circular ring, the outer peripheral wall of the circular ring is fixed with the inner peripheral wall of the outer casing, and the inner casing is placed on the outer casing. In the inner cavity of the outer sleeve, the bottom surface of the inner sleeve is in contact with the end surface of the circular ring; the top end of the inner sleeve is provided with a lifting lug, and the lifting lug is connected with the hook of the piling ship.

As a further improvement of the present invention, when the inner sleeve is sleeved into the outer sleeve, there is a gap between the inner wall of the outer sleeve and the outer wall of the inner sleeve; the inner wall of the outer sleeve also surrounds the circumferential direction A plurality of blocking members are evenly arranged, each of the blocking members is located at the gap, and the blocking members ensure that at any position in the circumferential direction, the value of the gap is equal.

As a further improvement of the present invention, the blocking member is an iron piece, and the width of the iron piece is slightly smaller than the gap value; the length of the iron piece is slightly larger than the gap value.

As a further improvement of the present invention, the blocking member is arranged in the same plane 5±3 cm from the top of the outer sleeve. Since the inner and outer casings are both long, in actual use, the lower end of the blocking member is also installed; the inner upper and lower ends of the outer casing will be arranged, 6 at each end, and one at every 60°.

As a further improvement of the present invention, the bottom inner peripheral wall of the outer casing is in contact with the bottom outer peripheral wall of the inner casing to prevent debris from entering between the inner casing and the outer casing during pile driving.

As a further improvement of the present invention, a plurality of reinforcing ribs are further provided between the annular ring and the outer sleeve, and the reinforcing ribs connect the annular ring and the outer sleeve at the same time, so as to realize the connection between the annular ring and the outer sleeve. More reliable connection of the outer casing.

As a further improvement of the present invention, the inner diameter of the bottom end of the outer sleeve is gradually reduced, and the minimum inner diameter of the outer sleeve is consistent with the outer diameter of the outer sleeve, so as to realize that the bottom inner peripheral wall of the outer sleeve and the inner The bottom peripheral wall of the sleeve fits.

As a further improvement of the present invention, the outer sleeve is formed by welding a plurality of first steel pipes along the length direction, and the joints of adjacent first steel pipes are fully welded and a stiffening plate is fixed outside the welding seam.

As a further improvement of the present invention, the inner sleeve is formed by welding a plurality of second steel pipes along the length direction, and the joints, inner walls and outer walls of adjacent second steel pipes are fully welded.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention uses a pile pulling tool, relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, and lifts the pile pulling tool with the single PHC pipe pile by means of the hook of the piling ship. Hanging on the shore together, the pile pulling process is simpler and the pile pulling efficiency is high.

2. The present invention adjusts the position of the pile-pulling tool to the same position as the PHC pipe pile before the pile-pulling tool drives the pile, which is convenient for the pile-pulling tool to drive the pile and avoids damage to the root PHC pipe when the pile-pulling tool drives the pile. The pile is more conducive to pulling the pile.

3. The present invention uses the pile pulling tool to hoist the inner casing and the PHC pipe pile together by relying on the friction force between the inner casing and the PHC pipe pile, utilizes the pile pulling tool to separate the PHC pipe pile from the soil under the water, and uses pile driving The boat lifts the pile pulling tool together with the PHC pipe pile to realize the rapid pile pulling of the PHC pipe pile.

4. The pile pulling tool of the present invention is to first install the outer casing and the inner casing together on the shore, wherein the iron ring welded at the bottom of the outer casing is used to withstand the inner casing, and no soil can enter during the pile driving process of the inner and outer casings. , to ensure that there is no friction between the inner and outer casings.

Description of drawings

Fig. 1 is a kind of flow chart of the construction method of pulling out the concrete pipe pile on water;

Fig. 2 is the structural representation of pile pulling tool;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the B-B sectional view of Fig. 2;

Fig. 5 is the structural representation of outer casing;

FIG. 6 is a schematic view of the structure of the inner sleeve.

Figure 7 is a cross-sectional view of the inner sleeve.

In the figure, 1. Outer casing; 2. Inner casing; 3. Ring; 4. Stopper; 5. Lifting lug.

Detailed ways

The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments do not limit the present invention. Equivalent transformations or substitutions all fall within the protection scope of the present invention.

PHC pipe piles are prestressed high-strength concrete pipe piles. It adopts the pre-tensioned prestressed centrifugal molding process, and after 10 atmospheric pressure (about 1.0Mpa) and steam curing at about 180 ℃, a hollow cylindrical concrete prefabricated component is made. The standard section length is 10m and the diameter ranges from 300mm~ 800mm, concrete strength grade ≥ C80.

At present, the domestic pile pulling methods mainly focus on static pulling method, high pressure rotary jet mud pile pulling method, vibrating immersed tube high pressure water cutting pile pulling method, azimuth CD machine pile pulling, FECE azimuth pile pulling method, etc. Among them, the static pulling method directly pulls the pipe pile out of the ground. This method has high requirements on the strength of the pile body and is not suitable for the removal of prefabricated pipe piles. The high-pressure swirling mud pile pulling method uses high-pressure swirling mud around the pile to destroy the soil around the pile. The disadvantage is that it is easy to cause broken piles, is greatly affected by the compactness of the stratum, and the stratum disturbance is large, so it is not suitable for the removal of prefabricated piles. The vibrating immersed tube high pressure water cutting pile pulling method uses vibration to liquefy the soil around the pile and penetrate into the steel pipe, and cooperate with high pressure water to destroy the soil between the pile body and the steel pipe, greatly reducing the pile side friction. The high-pressure water cutting pile pulling method of vibrating immersed tube is mostly suitable for pulling piles on water. When this method is used for pulling piles on land, the construction speed is slow and the stratum disturbance is large. The azimuth CD machine pile pulling is one of the most advanced methods for removing underground obstacles. It has the advantages of high verticality, adaptability to various complex geology, and no noise. The disadvantage is that the hydraulically driven steel casing has a slow rotation and cutting speed, the mechanical equipment needs to be counterweight to press down the steel casing with the help of a counter force, and a crane must be used for walking, so accurate positioning is difficult. The FECE full-rotation pile-pulling method adopts the method of double-layer casing rotary drilling to cut the soil around the pile to reduce the frictional resistance of the pile side. FECE zigzag pile pulling has the advantages of wide application range and good construction effect, especially for inclined piles and buildings that are sensitive to settlement near the site, but this method requires a special FECE zigzag pile pulling machine, and the construction cost is high.

Referring to FIG. 1, an embodiment of the present invention provides a construction method for pulling out a concrete pipe pile on water, comprising the following steps:

Step 1. The pile-pulling tool is hoisted to the position of a PHC pipe pile that needs to be pulled out by the piling ship, so that the position of the pile-pulling tool is consistent with the position of a PHC pipe pile;

Step 2, the pile pulling tool is driven to the bottom elevation position of the PHC pipe pile, and the pile pulling tool relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together;

Step 4, take out the PHC pipe pile;

Step 5. Use a vibrating hammer to pull out the outer casing, and then assemble the inner casing and pull out the next pile after hanging on the shore.

Step 1 of the embodiment of the present invention is specifically:

Step 1.1. Measure the PHC pipe pile to obtain the measurement parameters. Among them, the measurement parameters include: the inclination of the water-borne concrete pipe pile and the torsion angle of the water-borne concrete pipe pile.

Specifically: before the pile is pulled out, the parameters of the water PHC pipe pile are measured, calculated and positioned.

1. Establish a construction coordinate system according to the demolition wharf, and lay out control points.

2. Try to select the lowest tide measurement parameters during the spring tide and flood season, so that the length of the PHC pile exposed on the water surface is longer and the measurement accuracy is higher.

3. Measure the pile parameters, measure three points on the pile wall at the same elevation in the pile top area of the PHC pipe pile to be removed (forming a plane), and measure three points on the same elevation pile wall near the water surface of the same PHC pipe pile point (to form another plane);

4. Draw the center line of the PHC pipe pile on CAD according to the measured data, and calculate the various parameters of the pile, the coordinates of the center of the pile, the torsion angle of the pile, the slope of the pile and so on.

5. Calculate the elevation and angle of the control pile driver according to these pile parameters and the control points on site, and adjust the pile driver through the command of the on-site surveyor, just like positioning a new pile. Errors (mainly caused by the short length of the pile above the water surface), the surveyor on site and the construction worker on the piling ship should observe the actual situation, and make the final attitude adjustment of the piling ship to ensure that the inner and outer sleeves will not be in contact with the PHC. Piles hit.

Step 1.2. Lift the pile pulling tool to the position of the PHC pipe pile where the pile needs to be pulled out by the piling ship.

In step 2 of the embodiment of the present invention, the pile pulling tool relies on the friction between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, including: the PHC pipe pile is located inside the pile pulling tool; The friction between the pipe and the PHC piles lifts the inner casing and the PHC piles together.

The PHC pipe pile of the present invention is located inside the pile pulling tool, and includes: the pile pulling tool includes an inner casing and an outer casing; the inner casing and the outer casing are assembled after the installation is completed, and then hanged above the PHC pipe pile; the inner casing; After measuring and positioning with the outer casing, use the impact hammer to sink the inner casing and the outer casing together to the bottom elevation of the PHC pipe pile, at this time the PHC pipe pile is inside the inner casing.

The pile pulling tool of the present invention lifts the inner casing and the PHC pipe pile together by means of the friction force between the inner casing and the PHC pipe pile, including: a circular ring is arranged on the bottom surface of the outer casing, and the circular ring is used to allow the inner casing and the PHC pipe pile to be hoisted together. The outer casing does not enter the soil when the pile is driven, so as to generate friction; the PHC pipe pile is located inside the inner casing.

The inner casing and the PHC pipe pile are lifted together by the friction between the inner casing and the PHC pipe pile. The invention relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together, including: when the pile pulling tool sinks the pile to the bottom elevation position of the PHC pipe pile, the inner casing and the outer casing Slightly exceed the bottom of the PHC pipe pile; when the inner and outer casings are piled to the bottom of the PHC pipe pile, or slightly exceed the bottom of the PHC pipe pile, rely on the friction between the inner casing and the PHC pipe pile (mainly refers to the inner casing. The friction force between the contact surface with the soil (the soil formed between the inner casing and the PHC pipe pile) is greater than the weight of the PHC pipe pile (if the interior of the PHC pipe pile contains soil, the weight of the PHC pipe pile itself, and the The weight of the soil), the weight of the inner casing, and the weight of the soil between the PHC pipe pile and the inner casing; lift the inner casing and the PHC pipe pile together, and the outer casing does not need to be moved. First of all, the lengths of the piles vary. Generally speaking, it is about 22m from the sea level, so the two 12m steel casings used are welded;

Secondly, it slightly exceeds the bottom of the PHC pipe pile. According to the as-built drawings, it generally exceeds the elevation of the bottom of the pile by 50mm to 100mm. Because it is a pile driven by an impact hammer, if it is driven too deep, it is worried that the outer casing cannot be pulled out with a vibrating hammer;

The friction between the inner casing and the PHC pipe pile is greater than the weight of the PHC pipe pile, the weight of the inner casing, and the weight of the soil between the PHC pipe pile and the inner casing are discussed in detail as follows:

Fs=3N (N<=200) theoretical calculation

Rs=fs.As (As is the contact area between pile and soil)

Rs/safety factor" = required

According to the geological report, the value is 2m per layer

Take the pile length of 22m and the immersion of 10m as an example

Buried 0～2m: fs=3*3=9KN/m2

Buried 2m～4m: fs=3*13=39KN/m2

Buried 4m～6m: fs=3*54=162KN/m2

Buried 6m～8m: fs=3*89=267KN/m2

8m～10m in soil: fs=3*100=300KN/m2

①The friction between soil and PHC pipe pile is greater than the self-weight of PHC pipe pile, the self-weight of soil inside PHC pipe pile, and the self-weight of soil between PHC pipe pile and inner casing (steel pipe pile)

The self-weight of the soil between the PHC pipe pile and the inner casing (steel pipe pile) (calculated by clay): (3.14*0.454*0.454-3.14*0.3*0.3)*10*2.7=9.84ton, of which 0.454m is the inner casing Pipe radius, 0.3m is the radius of the PHC pipe pile, 10m is the depth of the soil between the inner casing and the PHC, and 2.7 is the density of the clay

PHC pipe pile:

The self-weight of the 22m long PHC pipe pile is 408*22=8976kg=8.976ton (408kg/m is the weight per meter of the 600mm diameter PHC pipe pile)

The self-weight of the soil plug inside the PHC pipe pile (the depth of the soil plug is considered to be 10m):

3.14*0.2*0.2*10*2.7=3.39ton (0.2 is the inner diameter of the PHC pipe pile, 10m is the length of the soil plug, and 2.7 is the clay density

Friction between soil and PHC pipe pile:

As=3.14*0.6*10=18.84m2 (0.6 is the diameter of PHC pile)

Rs/3=18.84*(9+39+162+267+300)/3=1463.8ton/3=487.93>9.84+8.976+3.39=22.206ton, which is much larger than the self-weight of the soil between the steel pipe pile and the PHC pile, The sum of the dead weight of the PHC pile and the dead weight of the PHC pile soil plug. (3 is to consider the safety factor of 3 times)

②The friction between the inner casing (steel pipe pile) and the soil contact surface is greater than the self-weight of the soil between the inner casing and the PHC pipe pile, the self-weight of the PHC pipe pile, the self-weight of the inner casing and the self-weight of the soil inside the PHC pipe pile (This part of the soil plug is assumed to be 10m)

Inner casing (steel pipe pile):

The self-weight of the 22m long inner casing is 3.14*0.908*7.85*24*22=11.817ton (0.908 is the diameter of the steel pipe pile, 7.85 is the unit weight of the 1mm thick iron plate, 24 is the wall thickness of the steel pipe pile, 22m is the steel pipe pile length

Friction of soil:

As=3.14*0.908*10=28.51m2

Rs/3=28.51*(9+39+162+267+300)/3=2215.7ton/3=738.56ton>11.817+22.206=34.023ton, which is much larger than the sum of the self-weight of soil, PHC pile and inner casing. (3 is the safety factor of 3 times, 11.817 is the self-weight of the steel pipe pile, 22.206 is the self-weight of the soil between the inner casing and the PHC, the self-weight of the PHC pile, the self-weight of the inner casing and the self-weight of the soil inside the PHC pipe pile. )

To sum up, the core theory of the present invention is established. Step 3 in the embodiment of the present invention is specifically:

First, use the hook of the piling ship to lift out the inner casing 2 together with the PHC pipe pile; then use the vibrating hammer to pull out the outer casing 1.

After step 4 in the embodiment of the present invention, step 5 is further included: repeating steps 1 to 4 to pull out the next PHC pipe pile.

In a special embodiment, the inner casing is inside the outer casing, and a 16Ton hydraulic impact hammer is used for the pile sinking of the inner casing and the outer casing. , Stop hammering, then hang the lifting ring of the inner casing with the hook of the piling ship, and directly pull out the inner casing and the PHC pipe pile together. After the inner casing is hoisted ashore, the soil in the inner casing is poured out, and the PHC pipe pile is poured out together with the soil. Clamp the outer casing with a pile clamp, and start the vibrating hammer to vibrate to pull out the outer casing.

Please refer to FIGS. 2 , 3 and 4 , as shown in FIGS. 5 and 6 , an embodiment of the present invention provides a pile pulling tool, which includes an outer casing 1 and an inner casing 2 , and the bottom end of the outer casing 1 is provided with a circular Ring 3, the outer peripheral wall of the ring 3 is fixed with the inner peripheral wall of the outer casing 1, the inner casing 2 is placed in the inner cavity of the outer casing 1, and the top of the inner casing 2 and the outer casing 1 are clamped by the same pile clamp, The bottom surface of the inner casing 2 is in contact with the end face of the ring 3; the top end of the inner casing 2 is provided with a lifting lug 5, which is connected with the hook of the piling ship.

The invention adopts the method of double casing drilling to cut off the soil around the PHC pipe pile, and the soil body is pulled up together with the PHC pipe pile.

The outer casing 1 of the embodiment of the present invention is made of a steel pipe with an outer diameter of 1000 mm and a wall thickness of 24 mm, and is welded and connected by two steel pipes with a length of 12 m. block stiffener. The bottom of the outer casing 1 is cut into a circular ring with a 4cm thick iron plate and welded to the outer casing 1. After the iron ring is welded, the inner casing 2 can directly act on the iron ring.

The ring generally does not change during the construction process. If the soil is too hard, the ring will be deformed to an ellipse. If the deformation is too large, the ring will hit the pile, and the ring needs to be corrected or reprocessed. Specifically, weld a ring at the bottom first. ring, and then weld a reinforcing iron sheet on the outside of the ring, and finally seal the surrounding area. The inner casing 2 of the embodiment of the present invention is made of a steel pipe with an outer diameter of 908 mm and a wall thickness of 24 mm, and is welded and connected by two steel pipes with a length of 12 m. Both inside and outside need to be welded. The inner side of the inner sleeve 2 is welded with two lifting ears 5, and the size is 20cm*20cm*4cm. After the inner and outer pipes are processed, insert the inner casing 2 into the outer casing 1 to ensure that the bottom and top of the inner and outer steel pipes are on the same plane. And ensure that the bottoms of the inner and outer casings 1 fit together, and no soil can enter between the inner and outer casings 1 during pile driving.

When the inner sleeve 2 is sleeved into the outer sleeve 1, there is a gap between the inner wall of the outer sleeve 1 and the outer wall of the inner sleeve 2; the inner wall of the outer sleeve 1 is also provided with a plurality of blocking members 4 evenly around the circumference, and each blocking member is 4 are all located at the gap, and the blocking member 4 ensures that the gap value is equal at any position in the circumferential direction. The blocking member 4 is arranged in the same plane 5±3 cm from the top of the outer sleeve 1 . Preferably, the blocking member 4 is an iron piece, and the width of the iron piece is slightly smaller than the gap value; the length of the iron piece is slightly larger than the gap value. In the same plane 5cm from the top of the

outer casing

1, 6 iron pieces are evenly arranged, and the size of the iron pieces is 5cm*5cm*2cm, which can ensure that the inner and outer casings 1 can be evenly distributed after assembling.

The purpose of providing the blocking member 4 in the present invention is to ensure that the inner sleeve 2 and the outer sleeve 1 can be evenly distributed after being assembled.

The bottom inner peripheral wall of the outer casing 1 is fitted with the bottom outer peripheral wall of the inner casing 2 to prevent debris from entering between the inner casing 2 and the outer casing 1 during pile driving.

Specifically, the inner diameter of the inner casing 2 is larger than the outer diameter of the water-borne concrete pipe pile; the water-borne concrete pipe pile is located in the inner cavity of the inner casing 2, and the inner casing 2 pulls out the water-borne concrete pipe pile together with the surrounding soil.

Preferably, a plurality of reinforcement ribs are further provided between the ring 3 and the outer sleeve 1 , and the reinforcement ribs connect the ring 3 and the outer sleeve 1 at the same time, so as to realize a more reliable connection between the ring 3 and the outer sleeve 1 .

In some embodiments, the inner diameter of the bottom end of the outer casing 1 is gradually reduced, and the minimum inner diameter of the outer casing 1 is consistent with the outer diameter of the outer casing 1, so as to realize the bottom outer peripheral wall of the inner casing 2 and the bottom outer circumference of the inner casing 2 Wall fit. The outer casing 1 is formed by welding a plurality of first steel pipes along the length direction, and the joints of the adjacent first steel pipes are fully welded and a stiffening plate is fixed outside the welding seam. The inner casing 2 is formed by welding a plurality of second steel pipes along the length direction, and the joints, inner walls and outer walls of adjacent second steel pipes are fully welded.

The construction process of the pile pulling tool is as follows:

Main and standby in the early stage: First, the surveyor will measure the slope and torsion angle of the PHC pipe piles of the wharf in advance. The piling boat cooperates with a 180T crawler crane to install the inner and outer casings 1 together, and then the piling boat lifts the inner and outer casings 1 together to the PHC pipe pile that needs to be pulled out. According to the surveyor's instructions, adjust the position and angle of the boat to match. The stakes are perfectly matched.

Construction of steel pipe piles: After everything is ready, use a 16Ton hydraulic impact hammer to sink the inner and outer casings 1 together to the bottom elevation of the existing dock PHC pipe piles.

Prepare to drive the pile with vibratory hammer: After the pile driving is completed, remove the vibratory hammer, and use the hook of the piling ship to lift out the inner casing 2 together with the PHC pipe pile. Then the outer casing 1 is pulled out with a vibrating hammer.

Take out the pipe pile: After the inner casing 2 and the outer casing 1 are lifted ashore, clean the mud between the inner casing 2 and the PHC pipe pile with water, and take out the PHC pipe pile. Then repeat the above steps to take out the next PHC pipe pile.

Pile pulling effect: Pile pulling tool, its construction progress is: 1 / 4 hours. Specifically, the casing is positioned for 20 minutes, the inner and outer casings 1 sink for 1 hour, the pipe piles are removed for 20 minutes, the inner casing 2 and the PHC pipe piles are cleaned for 2 hours, and the outer casing 1 is pulled out for 20 minutes. The method improves the success rate and efficacy of pile pulling.

Clean the mud between the inner casing 2 and the PHC pipe pile 9 with water, and take out the PHC pipe pile. Specifically, the following measures can be taken to improve the cleaning speed:

In order to improve the cleaning speed, as shown in FIG. 7 , the inner wall of the inner casing 2 is also equipped with a pile pulling assembly, and each group of the pile pulling assembly includes a water pipe 6, an air pipe 7 and a guard, and the guard is fixed on the inner wall of the casing 1, A cavity is formed between the guard and the inner wall of the sleeve 1, the water pipe 6 and the air pipe 7 are fixed in the cavity, and the water pipe 6 and the air pipe 7 penetrate the cavity along the axial direction of the sleeve 1; the water pipe 6 and the air pipe 7 are fixed in the cavity. The inner wall of the inner sleeve 2. Each group of pile pulling assemblies also includes a nozzle, which is fixed at the bottom of the water pipe 6 . The ejection port of the nozzle is arranged on its peripheral wall, and the water flow flowing through the water pipe 6 is ejected from the ejection port after the nozzle is turned 90°. The nozzle is conical, the large end of the nozzle is connected with the water pipe 6, and the small end of the nozzle is provided with a spray outlet. In use, in this embodiment, each water pipe 6 and air pipe 7 at the top are connected to a water pump and an air compressor with a rubber hose.

Further, the guard is changed from the original angle joint plate 2 to

The circular pipe 8, the bottom of the gas pipe 7 is stretched into the circular pipe 8, the water pipe 6 and the gas pipe 7 are welded on both sides of the circular pipe 8 respectively, and the inner wall of the inner casing 2 is fully welded, and the reinforced plate is used for welding reinforcement at the connection. , the top of the round tube 8 is fully welded and sealed with steel plates. Extend the life of pile pulling components.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

A construction method for pulling out concrete pipe piles on water, comprising the following steps:

Step 1, the pile pulling tool is hoisted to the position of a PHC pipe pile that needs to pull out the pile by the piling ship, so that the position of the pile pulling tool is consistent with the position of the described one PHC pipe pile;

Step 2, the pile pulling tool is driven to the bottom elevation position of the described PHC pipe pile, and the pile pulling tool relies on the friction force between the inner casing and the PHC pipe pile to hoist the inner casing and the PHC pipe pile together;

Step 3. Use the hook of the piling ship to hoist the pile pulling tool and the PHC pipe pile to the shore;

Step 4, take out the PHC pipe pile;

Step 5. Use a vibrating hammer to pull out the outer casing, and then assemble the inner casing and pull out the next pile after hanging on the shore.
The construction method of pulling out concrete pipe piles on water according to claim 1, is characterized in that, described step 1 is specifically:

Step 1.1, measure the PHC pipe pile to obtain the measurement parameters;

Step 1.2. Lift the pile pulling tool to the position of the PHC pipe pile where the pile needs to be pulled out by the piling ship;

Step 1.3. Adjust the position of the pile driver according to the measurement parameters, so that the position of the pile pulling tool is consistent with the position of the PHC pipe pile.
The construction method for pulling out concrete pipe piles on water according to claim 2, wherein the measurement parameters in step 1.1 include the inclination of the concrete pipe piles on water and the torsion angle of the concrete pipe piles on water.
The construction method of pulling out concrete pipe piles on water according to claim 1, characterized in that, in the step 2, the pile pulling tool relies on the friction between the inner casing and the PHC pipe piles to pull the inner casing and the PHC pipe piles. Lift together, including:

The PHC pipe pile is located inside the pile pulling tool;

The inner casing and the PHC pipe pile are lifted together by the friction between the inner casing and the PHC pipe pile.
The construction method of pulling out concrete pipe piles on water according to claim 4, is characterized in that, described PHC pipe piles are located inside pile pulling tools, comprising:

The pile pulling tool includes an inner casing and an outer casing;

The inner casing and the outer casing and the inner and outer casings are assembled after the installation is completed, and then they are lifted to the top of the PHC pipe pile;

After the inner casing and the outer casing are measured and positioned, use the impact hammer to drive the inner casing and the outer casing together to the bottom elevation of the PHC pipe pile. At this time, the PHC pipe pile is inside the inner casing.
The construction method for pulling out concrete pipe piles on water according to claim 4, wherein the pile pulling tool hoists the inner casing and the PHC pipe piles together by means of friction between the inner casing and the PHC pipe piles ,include:

The bottom surface of the outer casing is provided with a circular ring, and the circular ring is used to prevent the soil from entering the inner casing and the outer casing when the pile is driven, thereby generating friction;

The PHC pipe pile is located inside the inner casing;

The inner casing and the PHC pipe pile are lifted together by the friction between the inner casing and the PHC pipe pile.
The construction method of pulling out the concrete pipe pile on water according to claim 6, is characterized in that, relying on the friction force between the inner casing and the PHC pipe pile, the inner casing and the PHC pipe pile are hoisted together, comprising:

When the pile pulling tool drives the pile to the bottom elevation position of the PHC pipe pile, the inner casing and the outer casing should slightly exceed the bottom of the PHC pipe pile;

When the inner and outer casings are piled to the bottom of the PHC pipe pile, or slightly beyond the bottom of the PHC pipe pile, the friction between the inner casing and the PHC pipe pile is greater than the weight of the PHC pipe pile, the weight of the inner casing, and the PHC pipe pile. The weight of the soil between the inner casing and the inner casing; the inner casing and the PHC pipe pile are lifted together, and the outer casing does not need to be moved at this time.
The construction method of pulling out concrete pipe piles on water according to claim 1, is characterized in that, described step 3 is specifically:

First use the hook of the piling ship to lift out the inner casing together with the PHC pipe pile;

Then pull out the outer casing with a vibrating hammer.
The construction method of pulling out concrete pipe piles on water according to claim 1, is characterized in that, adopts impact hammer or vibrating hammer in described step 2 to pile pulling tool piles to the bottom elevation position of described PHC pipe piles.
A pile pulling tool is characterized in that it comprises an outer casing and an inner casing, the bottom end of the outer casing is provided with a circular ring, the outer peripheral wall of the circular ring is fixed with the inner peripheral wall of the outer casing, the inner casing is The sleeve is placed in the inner cavity of the outer sleeve, and the bottom surface of the inner sleeve is in contact with the end surface of the ring; the top of the inner sleeve is provided with a lifting lug, and the lifting lug is connected with the hook of the piling ship .
The pile pulling tool according to claim 10, wherein when the inner sleeve is sleeved into the outer sleeve, there is a gap between the inner wall of the outer sleeve and the outer wall of the inner sleeve;

The inner wall of the outer sleeve is also provided with a plurality of blocking members evenly around the circumference, each of the blocking members is located at the gap, and the blocking members ensure that at any position in the circumferential direction, the value of the gap is equal.
The pile pulling tool according to claim 10, wherein the blocking member is an iron piece, the width of the iron piece is slightly smaller than the gap value, and the length of the iron piece is slightly larger than the gap value.
The pile pulling tool according to claim 11, wherein the blocking member is arranged in the same plane 5±3 cm from the top of the outer casing.
A pile pulling tool according to claim 10, wherein the bottom inner peripheral wall of the outer casing is in contact with the bottom outer peripheral wall of the inner casing to prevent debris from entering the inner casing and the inner casing when the pile is driven. between the outer casings.
The pile pulling tool according to claim 10, wherein a plurality of reinforcing ribs are further provided between the circular ring and the outer sleeve, and the reinforcing ribs connect the circular ring and the outer sleeve at the same time pipe to achieve a more reliable connection between the ring and the outer sleeve.
The pile pulling tool according to claim 10, wherein the inner diameter of the bottom end of the outer sleeve is gradually reduced, and the minimum inner diameter of the outer sleeve is consistent with the outer diameter of the outer sleeve, so as to realize the The bottom inner peripheral wall of the outer sleeve is in contact with the bottom outer peripheral wall of the inner sleeve.
The pile pulling tool according to claim 10, wherein the outer casing is formed by welding a plurality of first steel pipes along the length direction, and the joints of the adjacent first steel pipes are fully welded and fixed on the outside of the welding seam. Set up stiffeners.
A pile pulling tool according to claim 10, wherein the inner casing is formed by welding a plurality of second steel pipes along the length direction, and the joints, inner walls and outer walls of adjacent second steel pipes are fully welded .