Pile side grouting device for cast-in-place pile

Abstract

The utility model relates to the technical field of cast-in-place pile construction, in particular to a cast-in-place pile side grouting device. Comprising a connecting structure, a corrugated pipe and a slurry outlet structure, the connecting structure is communicated with the grouting pipe; the corrugated pipe is arranged between the connecting structure and the slurry outlet structure; one end of the corrugated pipe is communicated with the connecting structure, and the other end is communicated with the slurry outlet structure; a slurry outlet hole is formed in the slurry outlet structure; and the slurry outlet hole is communicated with the corrugated pipe. In the prior art, a device for grouting on the pile side is of a rigid structure, so that the device is prone to being scratched and collided with the pile hole wall to be damaged when a reinforcement cage is lowered, and the grouting effect cannot meet the related requirements. Compared with the prior art, by means of the assembled corrugated pipe, deformation can be conducted to a certain degree when scratching occurs, and the device is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of cast-in-place pile construction, in particular to a cast-in-place pile side grouting device. Background Art

[0002] Cast-in-place piles are a type of structural support used to support the above-ground structures of large buildings such as bridges and viaducts. For example, as bridge spans grow longer and the height of above-ground structures increases, the bearing capacity requirements for cast-in-place pile foundations in bridge projects naturally increase.

[0003] With the continuous development of technology, grouting has become widely used in cast-in-place pile construction because it can effectively improve the bearing capacity of pile foundations, reduce pile foundation construction costs, extend pile foundation life, and shorten pile foundation construction period. Grouting the sides of cast-in-place piles can split, expand, fill, compact, and consolidate the soil around the piles. It can also effectively harden the mud skin around the piles and increase the frictional resistance between the pile foundation and the surrounding soil. While improving the bearing capacity of the pile foundation, it also protects the pile foundation from erosion by various substances in the surrounding soil. To effectively grout the pile sides, it is necessary to equip the corresponding grouting device.

[0004] A Chinese patent discloses a grouting mechanism based on post-grouting of cast-in-place piles [Application Number: CN202310211354.X, Publication Number: CN116220044A], which includes: a grouting device, a valve group, and a lateral grouting auxiliary device. The grouting device includes a slurry mixer, a slurry storage tank, and a grouting machine. The grouting machine is connected to the valve group. The bottom of the valve group is connected to a grouting pipe. The grouting pipe is preset in the pile foundation hole and is provided with a steel cage on the outside. The side of the grouting pipe is connected to a side grouting head. The side grouting head passes through the gap of the steel cage and extends into the soil layer on the side of the pile foundation hole. The valve group consists of a one-way valve, an overflow valve, a stop valve, a connector, and a connecting pipe. A pressure-maintaining structure is provided on the inside of the top of the grouting pipe. Although the technical solution of this patent can effectively carry out the grouting process, the structure of the technical solution of this patent is a rigid structure. When the technical solution of this patent is lowered with the steel cage, it is easy to rub against the pile hole wall and be damaged, resulting in the grouting effect not meeting the design requirements and posing a quality risk. Utility Model Content

[0005] In view of the technical problems of the prior art, the utility model provides a side grouting device for a bored pile.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A side grouting device for a bored pile comprises: a connecting structure, a bellows, and a grouting structure; the connecting structure is connected to the grouting pipe; the bellows is arranged between the connecting structure and the grouting structure; one end of the bellows is connected to the connecting structure, and the other end is connected to the grouting structure; a grouting hole is provided on the grouting structure; and the grouting hole is connected to the bellows.

[0008] In practical application, the grouting pipe is installed on the main reinforcement of the steel cage, and the connecting structure is connected to the grouting pipe. This allows the cement slurry in the grouting pipe to enter the grouting structure through the connecting structure and the bellows. When the device is lowered with the steel cage, if the grouting structure scrapes against the pile hole wall, the bellows will deform accordingly, thus preventing damage to the entire device due to scraping, and ensuring that the subsequent grouting effect meets the design requirements.

[0009] Furthermore, the connecting structure includes a tee joint and a conversion head; the tee joint is connected to the grouting pipe; there are two conversion heads; the conversion heads are respectively arranged at both ends of the corrugated pipe; one of the conversion heads is arranged on one side of the tee joint and is connected to the tee joint and the corrugated pipe; the other conversion head is connected to the corrugated pipe and the slurry outlet structure.

[0010] Furthermore, the slurry outlet structure includes a slurry outlet head; the slurry outlet head is connected to the bellows; the slurry outlet holes are opened on the side wall of the slurry outlet head; and the slurry outlet holes are arranged along the circumference of the slurry outlet head.

[0011] Furthermore, the pulp outlet structure also includes a non-return device; the non-return device is arranged in the pulp outlet head; the conduction flow direction of the non-return device is directed from the bellows to the pulp outlet head.

[0012] Furthermore, the pulp outlet structure also includes a rubber; the rubber sleeve is arranged on the pulp outlet head; and the rubber covers the pulp outlet hole.

[0013] Furthermore, the pulp outlet structure also includes a protective cover and a protective cap; the protective cover is arranged on the pulp outlet head; the protective cap is buckled on the protective cover to form a cavity for protecting the pulp outlet hole with the protective cover.

[0014] Furthermore, the distance between the slurry outlet hole and the hole wall is greater than 1 cm and less than 2 cm.

[0015] Furthermore, the ratio between the length of the bellows and the length of the pulp outlet structure is 0.9-1.3:1.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] Under the premise of maintaining the normal grouting, the utility model can undergo a certain degree of deformation after being scraped against the hole wall of the pile hole, thereby effectively avoiding damage to the device caused by the scraping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Overall structure diagram.

[0019] Figure 2 :Schematic diagram of the locations of L1 and L2.

[0020] In the figure: 1. Connection structure; 11. T-joint; 12. Converter; 2. Bellows; 3. Slurry discharge structure; 31. Slurry discharge hole; 32. Slurry discharge head; 33. Check valve; 34. Rubber; 35. Protective cover; 36. Protective cap. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] A cast-in-place pile side grouting device includes: a connecting structure 1, a bellows 2, and a slurry outlet structure 3. The connecting structure 1 includes a tee 11 and a conversion head 12. The tee 11 is installed on the grouting pipe and is connected to the grouting pipe. There are two conversion heads 12. The conversion heads 12 are respectively arranged at both ends of the bellows 2. One of the conversion heads 12 is located between the tee 11 and the bellows 2 and the conversion head 12 is located on one side of the tee 11, so that the entire device is in a vertical relationship with the grouting pipe. At the same time, the conversion head 12 is connected to the tee 11 and the bellows 2. The other conversion head 12 is located between the bellows 2 and the slurry outlet structure 3. At the same time, the conversion head 12 is connected to the bellows 2 and the slurry outlet structure 3. Specifically, the conversion head 12 can be an annular structure with a thread provided inside, and threaded joints are provided at positions corresponding to the tee 11, the bellows 2, and the slurry outlet structure 3. In this way, the conversion head 12 can be connected to other structures.

[0023] The bellows 2 is a tubular structure with a certain rigidity and a hollow interior. When subjected to external force, the bellows 2 can deform to a certain extent.

[0024] The slurry discharge structure 3 includes a slurry discharge hole 31, a slurry discharge head 32, a non-return device 33, a rubber 34, a protective cover 35, and a protective cap 36. The slurry discharge head 32 is arranged at one end of the bellows 2 away from the three-way joint 11 and is connected to the bellows 2 through the corresponding conversion head 12. There are multiple slurry discharge holes 31. The slurry discharge holes 31 are opened on the side wall of the slurry discharge head 32 and are evenly arranged along the circumference of the slurry discharge head 32. As a result, the slurry discharge holes 31 and the bellows 2 are also in a connected state. Preferably, the number of slurry discharge holes 31 is four. The non-return device 33 is arranged in the slurry discharge head 32. The flow direction of the non-return device 33 is from the bellows 2 to the slurry discharge head 32, so that the cement slurry can only flow from the bellows 2 to the slurry discharge head 32, but cannot flow from the slurry discharge head 32 to the bellows 2. Preferably, the non-return device 33 is a one-way valve. The rubber cover 34 is fitted over the pulp outlet 32, covering the pulp outlet hole 31. Thus, the rubber cover 34 seals the pulp outlet hole 31 to a certain extent. The protective cover 35 is bowl-shaped and fits over the pulp outlet 32. A protective cap 36 is fastened to the protective cover 35, forming a cavity that accommodates the pulp outlet 32 and protects the pulp outlet hole 31.

[0025] In actual application, the device is assembled on the grouting pipe through the three-way joint 11. The grouting pipe is tied to the main reinforcement of the steel cage. After the bored pile is completed, the grouting pipe is sent into the bored pile hole along with the steel cage. At this time, the grouting pipe is in a vertical state. Based on the above-mentioned structural design, the overall state of the device is approximately horizontal. Among them, the overall length of the device should be long enough so that the end with the protective cover 35 is as close to the hole wall of the pile hole as possible. At the same time, the distance between the slurry hole 31 and the hole wall is greater than 1 cm and less than 2 cm. In this way, the subsequent grouting requirements are met. On the other hand, the ratio between the length L1 of the corrugated pipe 2 and the length L2 of the slurry structure 3 is 0.9-1.3:1. As a preference, the ratio of L1 to L2 is 1.1:1. As a result, the corrugated pipe 2 can bear the weight of the slurry structure 3, so that in the process of lowering the steel cage, the device can autonomously maintain a horizontal state to avoid the slurry structure 3 causing excessive bending of the device under the influence of gravity. Since the subsequent grouting process is a process of outputting cement slurry under high pressure, the device should be kept horizontal as much as possible so that the distance between the slurry outlet hole 31 and the hole wall is within the aforementioned range to avoid adverse effects on subsequent grouting due to distortion of the device.

[0026] On the other hand, during the insertion of the rebar cage, the device will inevitably scrape against the hole wall. This scraping primarily occurs between the protective cover 35 or protective cap 36 and the hole wall. Taking protective cap 36 as an example, when scraping, the hole wall exerts an upward force on the protective cap 36 (since the rebar cage moves vertically downward, the force exerted by the hole wall is correspondingly upward). Under the action of this force, the bellows 2 deforms accordingly, exhibiting an upward bend. This protects the device from damage caused by scraping.

[0027] When the force exerted by the hole wall disappears, that is, when there is no more scratching, based on the aforementioned relationship between L1 and L2, the slurry outlet structure 3 will cause the corrugated tube 2 to deform in the opposite direction under the action of gravity, thereby returning to its initial horizontal state.

[0028] During pile hole construction, retaining wall slurry is simultaneously poured into the pile hole to balance the pressure of the surrounding strata and groundwater and prevent the hole wall from collapsing. The combination of a protective cover 35 and a protective cap 36 prevents the retaining wall slurry from entering the slurry outlet 32 through the slurry outlet hole 31. Furthermore, even if a small amount of retaining wall slurry seeps into the protective cover 35, the rubber 34 further prevents it from entering the slurry outlet 32.

[0029] Once the steel cage is assembled, concrete is poured into the pile hole to form the pile body. As the concrete is gradually poured in, it will eventually envelop the device. However, because the combined structure of protective cover 35 and protective cover 36 is closed, a space is created within the concrete to facilitate the subsequent grouting process. When the concrete hardness reaches 70%, the grouting process can begin. At this point, high-pressure cement slurry is injected into the grouting pipe. The cement slurry enters the grouting head 32 through the tee joint 11 and the bellows 2. Ultimately, it is discharged through the grouting hole 31. During the discharge process, the high-pressure cement slurry is able to break through the rubber and wash away the protective cover 36, allowing normal discharge. Furthermore, because protective cover 35 is mounted on the grouting head 32 and is a bowl-shaped structure with one end open, it guides the discharge direction of the cement slurry toward one side of the pile body during discharge, thus completing the grouting process.

[0030] After the cement slurry stops being discharged, it does not solidify quickly but remains fluid for a short period of time. To prevent the cement slurry from flowing back into the grouting pipe through the grouting hole 31 and causing grouting failure, the device uses a check valve 33 to restrict the flow direction of the cement slurry, so that the cement slurry can only flow from the grouting pipe to the grouting hole 31, but not from the grouting hole 31 to the grouting pipe. This prevents grouting failure.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A side grouting device for a bored pile, characterized by: include: Connecting structure (1), bellows (2), slurry discharge structure (3); The connecting structure (1) is connected to the grouting pipe; The bellows (2) is arranged between the connecting structure (1) and the pulp outlet structure (3); One end of the bellows (2) is connected to the connecting structure (1), and the other end is connected to the pulp outlet structure (3); The pulp outlet structure (3) is provided with a pulp outlet hole (31); The pulp outlet hole (31) is communicated with the corrugated pipe (2).

2. A cast-in-place pile side grouting device according to claim 1, characterized in that: The connection structure (1) comprises a three-way joint (11) and a conversion head (12); The three-way joint (11) is connected to the grouting pipe; The number of the conversion heads (12) is two; The conversion heads (12) are respectively arranged at both ends of the corrugated tube (2); One of the conversion heads (12) is arranged on one side of the three-way connector (11) and is connected to the three-way connector (11) and the corrugated pipe (2); Another conversion head (12) is connected to the bellows (2) and the pulp outlet structure (3).

3. The side grouting device for bored piles according to claim 1, characterized in that: The pulp discharging structure (3) includes a pulp discharging head (32); The pulp outlet head (32) is connected to the corrugated pipe (2); The pulp outlet hole (31) is provided on the side wall of the pulp outlet head (32); The pulp outlet holes (31) are arranged along the circumference of the pulp outlet head (32).

4. A cast-in-place pile side grouting device according to claim 3, characterized in that: The slurry discharge structure (3) further includes a backflow check device (33); The backflow check device (33) is arranged in the pulp outlet head (32); The conducting flow direction of the non-return device (33) is directed from the bellows (2) to the pulp outlet (32).

5. The side grouting device for bored pile according to claim 3, characterized in that: The pulp discharge structure (3) further includes a rubber (34); The rubber (34) is sleeved on the pulp outlet head (32); The rubber (34) covers the pulp outlet hole (31).

6. The side grouting device for bored piles according to claim 3, characterized in that: The pulp discharge structure (3) further includes a protective cover (35) and a protective cap (36); The protective cover (35) is provided on the pulp outlet head (32); The protective cover (36) is buckled on the protective cover (35) to form a cavity with the protective cover (35) for protecting the pulp outlet hole (31).

7. A cast-in-place pile side grouting device according to any one of claims 1 to 6, characterized in that: The distance between the pulp outlet hole (31) and the hole wall is greater than 1 cm and less than 2 cm.

8. The side grouting device for bored piles according to any one of claims 1 to 6, characterized in that: The ratio between the length of the corrugated pipe (2) and the length of the pulp outlet structure (3) is 0.9-1.3:1.

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