Valve-type enlarged pile shoe, prestressed pipe pile grouting device and construction method

Abstract

The present invention discloses a flap-type enlarged pile shoe, a prestressed pipe pile grouting device and a construction method, and belongs to the technical field of prestressed pipe pile sinking construction. The flap-type enlarged pile shoe provided by the present invention includes an upper connecting plate, a lower connecting plate, a connecting tube, a flap and an air bag. The flap-type enlarged pile shoe is fixedly connected to the pile end of the prestressed pipe pile. The flap is hingedly connected to the lower connecting piece and can rotate relative to the lower connecting piece. The outer periphery of the connecting tube is wrapped with an air bag that can expand and squeeze the flap to expand. During construction, after the prestressed pipe pile is sunk to a predetermined depth, an air pump is used to inflate the air bag to expand the flap to form an enlarged pile shoe, and the slurry flows along the expansion direction of the flap to form an enlarged head, thereby increasing the bearing capacity of the pile end. The present invention has an ingenious structural design, can enhance the bearing capacity of the pile end, and is easy to operate, easy to construct, and has a low project cost.

Description

Technical Field

[0001] The invention belongs to the technical field of prestressed pipe pile sinking construction, and in particular relates to a flap-type enlarged pile shoe, a prestressed pipe pile grouting device and a construction method. Background Art

[0002] At present, prestressed high-strength concrete pipe piles (PHC piles), prestressed concrete pipe piles (PC piles) and prestressed concrete thin-walled pipe piles (PTC piles) made by prestressing technology are widely used in civil engineering foundation treatment and pile foundation. Prestressed pipe piles integrate the advantages of prestressing, the advantages of concrete and centrifugal pipe forming technology, thus obtaining a pile foundation form with high bearing capacity, good bending resistance, good crack resistance, quick and convenient construction and reliable quality.

[0003] Generally, the bottom-enlarged pile is formed by using special equipment to form an enlarged head at the bottom of the pile body on the basis of the original bored pile with equal cross-section, so it is called a bottom-enlarged cast-in-place pile. However, this type of enlarged head can only be applied to cast-in-place piles, and this enlarged head is prefabricated and cannot adjust the diameter according to the actual situation in different projects. The Chinese invention patent with application number 202210981226.9 discloses a prefabricated pipe pile construction method based on a self-enlarging pile shoe structure with built-in high-expansion material. A self-enlarging pile shoe is set at the bottom of the prefabricated pipe pile. The self-enlarging pile shoe uses the principle of high-expansion material swelling when it encounters water to achieve the expansion of the pile end. Although this method can achieve the expansion of the pile shoe, it requires additional expansion materials, which increases the construction cost. In order to ensure the safety of the buildings and structures above the pile foundation, the pile foundation must have sufficient bearing capacity. How to form a pipe pile structure with an enlarged head and realize flexible control of the diameter of the enlarged head is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pipe pile structure that can flexibly control the diameter of the enlarged head. Specifically, a flap-type enlarged pile shoe, a prestressed pipe pile grouting device and a construction method are provided. The specific technical solutions adopted by the present invention are as follows:

[0005] In the first aspect, the present invention provides a flap-type expansion pile shoe. The flap-type expansion pile shoe includes a plurality of flaps, an upper connecting plate, a lower connecting plate, a connecting tube and an air bag. The connecting tube is vertically arranged to connect the upper connecting plate and the lower connecting plate, and the upper and bottom parts of the connecting tube are fixedly connected to the opening of the upper connecting plate and the lower connecting plate, respectively. The outer periphery of the connecting tube is wrapped with an air bag that can expand and open the flap. A plurality of flaps are evenly distributed along the circumference of the outer side of the lower connecting plate. The flap is connected to the lower connecting plate by a hinge so that the flap and the lower connecting plate can rotate relative to each other. When the flap is kept in a vertical state, a cavity for temporarily storing grouting slurry is formed between the upper connecting plate, the lower connecting plate and the flap.

[0006] Preferably, the connection tube is fixedly connected to the upper connection plate and the lower connection plate by welding.

[0007] Preferably, the valve-type enlarged pile shoe is made of a rigid metal material.

[0008] Furthermore, the upper connecting plate and the lower connecting plate in the above-mentioned flap-type enlarged pile shoe are both circular steel plates.

[0009] Furthermore, the connecting tube in the above-mentioned flap-type enlarged pile shoe is a cylindrical steel plate.

[0010] Furthermore, the material of the valve in the above-mentioned valve-type enlarged pile shoe is steel plate.

[0011] Preferably, the number of the above-mentioned valves is set to four.

[0012] Preferably, the hinged component is a hinge connection component.

[0013] In a second aspect, the present invention provides a prestressed pipe pile grouting device. The prestressed pipe pile grouting device comprises the flap-type enlarged pile shoe and the prestressed pipe pile described in the first aspect. The flap-type enlarged pile shoe is fixedly connected to the pile end of the prestressed pipe pile through an upper connecting plate.

[0014] In a third aspect, the present invention provides a construction method using the prestressed pipe pile grouting device described in the second aspect, and the specific steps are as follows:

[0015] S1: placing the guide pile frame at the target pile position, using the lifting equipment to lift the prestressed pipe pile, so that it passes through the guide pile frame and is in place; fixing the flap-type expanded pile shoe to the bottom of the prestressed pipe pile, and forming a prestressed pipe pile structure with the flap-type expanded pile shoe.

[0016] S2: Before the pile is sunk, the air bag in the flap-type expanded pile shoe is connected to the air pump through a pipeline in a sealed manner.

[0017] S3: The prestressed pipe pile and the flap-type expanded pile shoe are sunk to the designed soil depth by hammering or static pressure. During the pile sinking process, the flap on the flap-type expanded pile shoe does not rotate due to the pressure of the soil and remains vertical, and a relatively sealed cavity that can be used to temporarily store slurry is formed between the flap, the upper connecting plate and the lower connecting plate.

[0018] S4: Before grouting, the air pump is turned on to expand the airbag; the airbag squeezes the valve to rotate relative to the lower connecting plate to change the pile end diameter to form an enlarged pile shoe with adjustable size; then grouting is injected into the prestressed pipe pile 1, and the slurry flows around along the direction of the valve, and an enlarged head is formed at the pile tip after solidification.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The present invention utilizes the expansion of the airbag to squeeze the valve to form an enlarged pile tip, which is easy to operate and has a good expansion effect, and is conducive to practical application;

[0021] (2) The present invention forms an enlarged pile shoe at the bottom of the pile to improve the bearing capacity of the pile end, which plays an important role in ensuring the stability of the superstructure;

[0022] (3) The flap-type pile tip designed in the present invention is mainly formed by welding and hinged connection of steel plates, and has a simple production process and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a method for constructing a prestressed pipe pile with a flap-type enlarged pile shoe provided in an embodiment;

[0024] Figure 2 A schematic diagram of the construction state of the grouting device provided in the embodiment;

[0025] Figure 3 A top view of a flap in a flap-type enlarged pile shoe provided in an embodiment;

[0026] Figure 4 A schematic diagram of a valve connection provided in an embodiment;

[0027] Figure 5 A schematic diagram of an unexpanded airbag in a flap-type enlarged pile shoe provided in an embodiment;

[0028] Figure 6 A schematic diagram of the expansion of an airbag in a flap-type expansion pile shoe provided in an embodiment;

[0029] In the figure: prestressed pipe pile 1, valve 2, upper connecting plate 3, lower connecting plate 4, connecting tube 5 and air bag 6. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. The technical features in each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0031] In the description of the present invention, it is to be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or indirectly connected, that is, there are intermediate elements. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0032] In a preferred embodiment of the present invention, a flap-type enlarged pile shoe is provided. Figure 2 The flap-type expanded pile shoe is the core structure of the present invention that plays a role in the bearing capacity of the pile end, and specifically includes a number of flaps 2, an upper connecting plate 3, a lower connecting plate 4, a connecting tube 5 and an air bag 6. The flaps and the air bag are used as special structural designs to achieve controllable expansion of the diameter of the expanded pile.

[0033] Considering the actual construction situation, in order to improve the grouting efficiency, cylindrical prestressed pipe piles are generally used in the grouting process. Therefore, the upper connecting plate 3 and the lower connecting plate 4 are both made of circular steel plates, such as Figure 3 shown.

[0034] like Figure 4 As shown, the connecting tube 5 is used to connect the upper connecting plate 3 and the lower connecting plate 4. In this embodiment, a cylindrical steel plate is used as the connecting tube 5. The upper connecting plate 3 has a hole in the middle, and the connecting tube 5 is arranged in a vertical direction. The upper and bottom parts of the connecting tube 5 are respectively welded to the hole of the upper connecting plate 3 and the lower connecting plate 4 as a whole. It should be noted that the material and shape of the connecting tube 5 can be selected according to the actual construction conditions, and it only needs to meet the compressive strength of the flap-type expanded pile shoe to meet the grouting construction conditions.

[0035] A plurality of flaps 2 are arranged along the outer circumference of the lower connecting plate 4, and each flap 2 is connected to the lower connecting plate 4 by a hinge, so that the flap 2 and the lower connecting plate 4 can achieve relative rotation. The gap at each hinge position can be kept as small as possible, and a certain gap is allowed as long as it does not cause the through-flow of grouting slurry. In this embodiment, the number of flaps 2 is set to four, and the selected material is steel plate. However, in actual applications, the number of flaps 2 can be selected according to the construction situation. It is only necessary to ensure that during the pile sinking process of the flap-type enlarged pile shoe, a relatively sealed cavity for temporarily storing slurry is formed between the flap 2, the upper connecting plate 3 and the lower connecting plate 4. The specific schematic diagram is shown in the figure. Figure 4 shown.

[0036] like Figure 5 As shown, the outer periphery of the connecting tube 5 is wrapped with an air bag 6. The air bag 6 is connected to an external air pump. When the flap-type expansion pile shoe is sunk to the designed stratum, the air pump is turned on to expand the air bag 6 to squeeze the flap 2, so that the flap 2 rotates relative to the lower connecting plate 4 to form an expansion head.

[0037] In this embodiment, the upper connecting plate 3 in the flap-type expanded pile shoe is fixedly connected to the bottom of the prestressed pipe pile 1 by welding, and the connecting tube 5 is fixedly connected to the upper connecting plate 3 and the lower connecting plate 4 by welding. However, in actual construction applications, other fixed connection methods may also be used.

[0038] It should be noted that, in this embodiment, the valve 2, the upper connecting plate 3, the lower connecting plate 4 and the connecting tube 5 are all made of steel. However, in actual construction applications, the above components can also be made of other rigid metal materials, such as iron, aluminum and other materials.

[0039] The present invention also provides a prestressed pipe pile grouting device for fixedly connecting the above-mentioned flap-type enlarged pile shoe and the prestressed pipe pile. It should be noted that in this embodiment, the flap-type enlarged pile shoe is fixedly connected to the pile end of the prestressed pipe pile through an upper connecting plate by welding.

[0040] In a preferred embodiment of the present invention, a method for grouting a prestressed pipe pile using the above-mentioned flap-type expanded pile shoe is also provided. The method uses the flap-type expanded pile shoe to form an expanded head at the bottom of the prestressed pipe pile, and then pours concrete or cement to finally form an expanded bottom pile. The schematic diagram of the construction state of the grouting device is shown in FIG. Figure 1 As shown, the specific steps are as follows:

[0041] Step 1: Select two circular steel plates of the same size as the upper connecting plate 3 and the lower connecting plate 4, and a cylindrical steel plate as the connecting tube 5. The upper and lower circular steel plates are connected to the cylindrical steel plate by welding to form a whole.

[0042] Step 2: Four steel plates are used as flaps 2 and are fixed to the periphery of the lower connecting plate 4 by hinge connection. The four flaps 2 can rotate relative to the lower connecting plate 4.

[0043] Step 3: Place the guide pile frame at the target pile position, and use the lifting equipment to lift the prestressed pipe pile 1 so that it passes through the guide pile frame and is in place. Install the flap-type expanded pile shoe on the bottom pile end of the prestressed pipe pile 1, and connect the flap-type expanded pile shoe and the bottom of the prestressed pipe pile 1 into a whole by welding.

[0044] Step 4: Before sinking the pile, connect the air pump to the air bag 6 in the valve-type expansion pile shoe to ensure airtightness between the two.

[0045] Step 5: Sink the prestressed pipe pile 1 and the flap-type expanded pile shoe to the designed soil depth by hammering or static pressure. During the pile sinking process, the flap on the flap-type expanded pile shoe will not rotate due to the pressure of the soil and will remain vertical, and a relatively sealed cavity that can be used to temporarily store slurry is formed between the flap 2, the upper connecting plate 3 and the lower connecting plate 4.

[0046] Step 6: When grouting is required, turn on the air pump to expand the airbag 6. The airbag 6 squeezes the flap 2 to rotate relative to the lower connecting plate 4. Then start grouting into the prestressed pipe pile 1. The flap 2 is squeezed by the airbag 6 and expands to the surroundings. The relatively sealed cavity formed between the flap 2, the upper connecting plate 3 and the lower connecting plate 4 opens, and the slurry flows to the surroundings. After solidification, an enlarged head with a certain strength will be formed at the pile tip.

[0047] The present invention provides a prestressed pipe pile grouting device with a flap-type expanded pile shoe through the above technical solution. It adopts the form of four flaps and effectively utilizes the expansion characteristics of the airbag to form an expanded head at the pile tip. The grouting device provided by the present invention has an ingenious structural design and can effectively improve the bearing capacity of the pile end. In addition, the grouting device provided by the present invention requires simple and environmentally friendly materials, has a simple production process and low production cost, is simple to operate, is easy to construct, and has high use value.

[0048] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A construction method for grouting using a prestressed pipe pile grouting device, characterized in that: The prestressed pipe pile grouting device comprises a flap-type enlarged pile shoe and a prestressed pipe pile (1); the flap-type enlarged pile shoe is fixedly connected to the pile end of the prestressed pipe pile (1) via an upper connecting plate (3); The flap-type expansion pile shoe comprises a plurality of flaps (2), an upper connecting plate (3), a lower connecting plate (4), a connecting tube (5) and an air bag (6); the connecting tube (5) is arranged in a vertical direction for connecting the upper connecting plate (3) and the lower connecting plate (4), and the upper part and the bottom part of the connecting tube (5) are respectively fixedly connected to the opening of the upper connecting plate (3) and the lower connecting plate (4); the outer periphery of the connecting tube (5) is wrapped with an air bag (6) capable of expanding and opening the flap (2); the plurality of flaps (2) are evenly distributed along the outer circumference of the lower connecting plate (4); the flap (2) is connected to the lower connecting plate (4) through a hinge so that the flap (2) and the lower connecting plate (4) can rotate relative to each other; when the flap (2) is kept in a vertical state, a cavity for temporarily storing grouting slurry is formed between the upper connecting plate (3), the lower connecting plate (4) and the flap (2); The specific construction steps are as follows: S1: placing a guide pile frame at a target pile position, using a lifting device to lift a prestressed pipe pile (1) so that it passes through the guide pile frame and is in place; fixing the flap-type enlarged pile shoe to the bottom of the prestressed pipe pile (1), and forming a prestressed pipe pile structure with a flap-type enlarged pile shoe; S2: Before pile sinking, the air bag (6) in the flap-type expanded pile shoe is connected to the air pump through a pipeline in a sealed manner; S3: The prestressed pipe pile (1) and the flap-type expanded pile shoe are sunk to the designed soil layer depth by hammering or static pressure. During the pile sinking process, the flap on the flap-type expanded pile shoe does not rotate due to the soil pressure and remains vertical, and a relatively sealed cavity for temporarily storing slurry is formed between the flap (2), the upper connecting plate (3) and the lower connecting plate (4); S4: Before grouting, the air pump is turned on to expand the airbag (6); the airbag (6) squeezes the valve (2) to rotate relative to the lower connecting plate (4) to change the diameter of the pile end to form an enlarged pile shoe with adjustable size; then grouting is injected into the prestressed pipe pile (1), and the slurry flows in the direction of the valve (2) to form an enlarged head at the pile tip after solidification.

2. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The connection tube (5) is fixedly connected to the upper connection plate (3) and the lower connection plate (4) by welding.

3. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The flap-type enlarged pile shoe is made of rigid metal material.

4. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The upper connecting plate (3) and the lower connecting plate (4) in the flap-type enlarged pile shoe are both circular steel plates.

5. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The connecting tube (5) in the flap-type enlarged pile shoe is a cylindrical steel plate.

6. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The material of the flap (2) in the flap-type enlarged pile shoe is a steel plate.

7. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The number of the flaps (2) is set to four.

8. The construction method for grouting using a prestressed pipe pile grouting device according to claim 1, characterized in that: The hinged part is a hinge connecting part.

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