Pile side grouting device for cast-in-place pile

Abstract

The invention 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, when scratching occurs, deformation can be conducted to a certain degree, and the device is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of cast-in-place pile construction, and particularly to a side grouting device for cast-in-place piles. Background Art

[0002] A cast-in-place pile is a building structure that supports the above-ground structure of large buildings such as bridges and viaducts. Taking a bridge as an example, as the span of the bridge increases and the height of the above-ground structure increases, the requirements for the bearing capacity of the pile foundation of the cast-in-place pile in bridge engineering are naturally getting higher and higher.

[0003] With the continuous development of technology, the grouting process has been widely used in cast-in-place pile construction because it can effectively improve the bearing capacity of the pile foundation, reduce the cost of pile foundation engineering, extend the service life of the pile foundation, and shorten the construction period of the pile foundation. Among them, grouting on the side of the cast-in-place pile can split, infiltrate, fill, compress, and consolidate the soil on the side of the pile, and can effectively harden the mud skin around the pile, increasing the frictional resistance between the pile foundation and the surrounding soil. While improving the bearing capacity of the pile foundation, it protects the pile foundation from the erosion of various substances in the surrounding soil. In order to effectively grout the side of the pile, a corresponding grouting device needs to be assembled.

[0004] Chinese Patent discloses a grouting mechanism based on post-grouting of cast-in-place piles [Application No.: CN202310211354.X, Publication No.: 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, which is preset in the pile foundation hole. There is a steel reinforcement cage outside. A side grouting head is connected to the side of the grouting pipe. The side grouting head passes through the gap of the steel reinforcement cage and extends into the side soil layer of the pile foundation hole. The valve group consists of a check valve, a relief valve, a stop valve, a connector, and a connecting pipe. A pressure-holding structure is provided inside 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 reinforcement 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 there being quality hidden dangers. Summary of the Invention

[0005] In view of the technical problems of the prior art, the present invention provides a side grouting device for cast-in-place piles.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] A side grouting device for cast-in-place piles, comprising: a connection structure, a corrugated pipe, and a slurry outlet structure; the connection structure is in communication with the grouting pipe; the corrugated pipe is arranged between the connection structure and the slurry outlet structure; one end of the corrugated pipe is in communication with the connection structure, and the other end is in communication with the slurry outlet structure; slurry outlet holes are provided on the slurry outlet structure; the slurry outlet holes are in communication with the corrugated pipe.

[0008] In actual application, the grouting pipe is installed on the main reinforcement bars of the steel reinforcement cage, and the connecting structure is connected to the grouting pipe. Thus, the cement slurry in the grouting pipe can enter the slurry outlet structure through the connecting structure and the corrugated pipe. When the device is lowered along with the steel reinforcement cage, if the slurry outlet structure rubs against the pile hole wall, the corrugated pipe will undergo corresponding deformation, thereby avoiding damage to the entire device due to rubbing, and further enabling the subsequent grouting effect to meet the design requirements.

[0009] Furthermore, the connecting structure includes a tee joint and an adapter; the tee joint is connected to the grouting pipe; the number of adapters is two; the adapters are respectively arranged at both ends of the corrugated pipe; one of the adapters is arranged on one side of the tee joint and is connected to the tee joint and the corrugated pipe; the other adapter 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 corrugated pipe; slurry outlet holes are opened on the side wall of the slurry outlet head; the slurry outlet holes are arranged circumferentially along the slurry outlet head.

[0011] Furthermore, the slurry outlet structure further includes a check valve for reverse flow; the check valve for reverse flow is arranged inside the slurry outlet head; the conduction direction of the check valve for reverse flow is from the corrugated pipe to the slurry outlet head.

[0012] Furthermore, the slurry outlet structure further includes a rubber sheet; the rubber sheet is sleeved on the slurry outlet head; the rubber sheet covers the slurry outlet holes.

[0013] Furthermore, the slurry outlet structure further includes a protective cover and a protective cap; the protective cover covers the slurry outlet head; the protective cap is buckled on the protective cover to form a cavity for protecting the slurry outlet holes with the protective cover.

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

[0015] Furthermore, the ratio of the length of the corrugated pipe to the length of the slurry outlet structure is: 0.9 - 1.3:1.

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

[0017] On the premise of maintaining the normal progress of grouting, the present invention can undergo a certain degree of deformation after rubbing against the hole wall of the pile hole, thereby effectively avoiding damage to the device caused by rubbing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Overall structure diagram.

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

[0020] In the figure: 1. Connection structure; 11. Three-way joint; 12. Adapter; 2. Bellows; 3. Grout discharging structure; 31. Grout discharging hole; 32. Grout discharging head; 33. Check valve; 34. Rubber sheet; 35. Protective cover; 36. Protective cap. Detailed implementation mode

[0021] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0022] A side grouting device for cast-in-place piles includes: a connection structure 1, a bellows 2, and a grout discharging structure 3. The connection structure 1 includes a three-way joint 11 and an adapter 12. The three-way joint 11 is installed on the grouting pipe and is in communication with the grouting pipe. The number of adapters 12 is two. The adapters 12 are respectively arranged at both ends of the bellows 2. One of the adapters 12 is located between the three-way joint 11 and the bellows 2 and this adapter 12 is on one side of the three-way joint 11, so that the whole device is perpendicular to the grouting pipe. At the same time, this adapter 12 is in communication with the three-way joint 11 and the bellows 2. The other adapter 12 is located between the bellows 2 and the grout discharging structure 3. At the same time, this adapter 12 is in communication with the bellows 2 and the grout discharging structure 3. Specifically, the adapter 12 can be an annular structure with internal threads, and threaded joints are arranged at the corresponding positions of the three-way joint 11, the bellows 2, and the grout discharging structure 3. Thus, the adapter 12 can be connected to other structures together.

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

[0024] The slurry discharging structure 3 includes a slurry discharging hole 31, a slurry discharging head 32, a check reflux device 33, a rubber sheet 34, a protective cover 35, and a protective cap 36. The slurry discharging head 32 is arranged at one end of the corrugated pipe 2 away from the three-way joint 11 and is connected to the corrugated pipe 2 through a corresponding adapter 12. The number of the slurry discharging holes 31 is multiple. The slurry discharging holes 31 are formed in the side wall of the slurry discharging head 32 and are uniformly arranged along the circumferential direction of the slurry discharging head 32. Thus, the slurry discharging holes 31 are also in a communicating state with the corrugated pipe 2. Preferably, the number of the slurry discharging holes 31 is four. The check reflux device 33 is arranged inside the slurry discharging head 32. The conducting direction of the check reflux device 33 is from the corrugated pipe 2 to the slurry discharging head 32, so that the cement slurry can only flow from the corrugated pipe 2 to the slurry discharging head 32 and cannot flow from the slurry discharging head 32 to the corrugated pipe 2. Preferably, the check reflux device 33 is a one-way valve. The rubber sheet 34 is sleeved on the slurry discharging head 32, and the rubber sheet 34 covers the slurry discharging holes 31. Thus, the slurry discharging holes 31 are sealed to a certain extent by the rubber sheet 34. The protective cover 35 is in a bowl shape. The protective cover 35 covers the slurry discharging head 32. At the same time, the protective cap 36 is buckled on the protective cover 35 to jointly form a cavity for accommodating the slurry discharging head 32 with the protective cover 35, so as to protect the slurry discharging holes 31.

[0025] In actual application, the device is assembled on the grouting pipe through the three-way joint 11. The grouting pipe is bound to the main reinforcement of the steel reinforcement cage. When the drilling of the cast-in-place pile is completed, the grouting pipe is sent into the pile hole of the cast-in-place pile together with the steel reinforcement cage. At this time, the grouting pipe is in a vertical state. Based on the foregoing structural design, the whole device is in an approximately horizontal state. Among them, the overall length of the device should be long enough so that the end provided with the protective cover 35 is as close as possible to the hole wall of the pile hole. At the same time, the distance between the slurry discharging holes 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 of the length L1 of the corrugated pipe 2 to the length L2 of the slurry discharging structure 3 is 0.9 - 1.3:1. Preferably, the ratio of L1 to L2 is 1.1:1. Thus, the corrugated pipe 2 can bear the weight of the slurry discharging structure 3, so that during the process of lowering the steel reinforcement cage, the device can maintain a horizontal state independently to avoid excessive bending of the device caused by the influence of gravity on the slurry discharging structure 3. 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 discharging holes 31 and the hole wall is within the foregoing range to avoid adverse effects on the subsequent grouting due to the distortion of the device.

[0026] On the other hand, during the process of feeding the steel reinforcement cage, the device will inevitably rub against the hole wall, and the rubbing mainly occurs between the protective cover 35 or the protective cap 36 and the hole wall. Taking the protective cap 36 as an example, when rubbing occurs, the hole wall will exert an upward force on the protective cap 36 (since the movement direction of the steel reinforcement cage is vertically downward, relatively, the force exerted by the hole wall is upward). Under the action of the force, the corrugated pipe 2 will undergo corresponding deformation and present an upwardly curved state. Thus, the device is protected from damage due to rubbing.

[0027] When the force exerted by the hole wall disappears, that is, when there is no more rubbing, based on the aforementioned relationship between L1 and L2, the grouting structure 3 will, under the action of gravity, cause the corrugated pipe 2 to deform in the reverse direction, thereby restoring to the initial horizontal state.

[0028] Meanwhile, during the construction of the pile hole, in order to balance the pressure of the surrounding strata and groundwater and prevent the hole wall from collapsing, slurry for protecting the hole wall will be simultaneously poured into the pile hole. Through the combination of the protective cover 35 and the protective cap 36, it is possible to prevent the slurry for protecting the hole wall from entering the grouting head 32 through the grouting holes 31. On the other hand, even if a small amount of the slurry for protecting the hole wall seeps into the protective cover 35, the rubber sheet 34 can further prevent the slurry for protecting the hole wall from entering the grouting head 32.

[0029] After the assembly of the steel reinforcement cage is completed, concrete will be poured into the pile hole to form the pile body. As the concrete is gradually poured in, finally the concrete will cover the device. However, due to the combined structure of the protective cover 35 and the protective cap 36 being in a closed state, a part of the space will be propped up within the concrete to facilitate the normal progress of subsequent grouting. When the hardness of the concrete reaches 70%, the grouting process can be carried out. At this time, high-pressure cement slurry is injected into the grouting pipe. The cement slurry will enter the grouting head 32 through the tee joint 11 and the corrugated pipe 2. Finally, it is output through the grouting holes 31. During the output process, since the cement slurry is in a high-pressure state, the cement slurry can break through the limitation of the rubber sheet and wash away the protective cap 36, so that it can be normally output. On the other hand, since the protective cover 35 is sleeved on the grouting head 32 and the protective cover 35 is a bowl-shaped structure with one end open, during the output process of the cement slurry, the protective cover 35 will guide the output direction of the cement slurry, making the output direction of the cement slurry face one side of the pile body. Thus, the grouting process is completed.

[0030] When the output of the cement slurry stops, the cement slurry will not quickly solidify into a solid state, but still has a certain fluidity within a short period of time. To prevent the cement slurry from flowing back into the grouting pipe through the grouting holes 31 and causing the failure of grouting. The device uses the 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 holes 31, and cannot flow from the grouting holes 31 to the grouting pipe. Thus, the failure of grouting is avoided.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A side grouting device for cast-in-place pile, characterized in that: Including: A connection structure (1), a corrugated pipe (2), and a grout discharging structure (3); The connection structure (1) is communicated with a grouting pipe; The corrugated pipe (2) is arranged between the connection structure (1) and the grout discharging structure (3); One end of the corrugated pipe (2) is communicated with the connection structure (1), and the other end is communicated with the grout discharging structure (3); The grout discharging structure (3) is provided with a grout discharging hole (31); The grout discharging hole (31) is communicated with the corrugated pipe (2).

2. The side grouting device for cast-in-place pile according to claim 1, wherein: The connection structure (1) includes a tee joint (11) and an adapter (12); The tee joint (11) is communicated with the grouting pipe; The number of the adapters (12) is two; The adapters (12) are respectively arranged at both ends of the corrugated pipe (2); One of the adapters (12) is arranged on one side of the tee joint (11) and is communicated with the tee joint (11) and the corrugated pipe (2); The other adapter (12) is communicated with the corrugated pipe (2) and the grout discharging structure (3).

3. The side grouting device for cast-in-place pile according to claim 1, wherein: The grout discharging structure (3) includes a grout discharging head (32); The grout discharging head (32) is communicated with the corrugated pipe (2); The grout discharging hole (31) is opened on the side wall of the grout discharging head (32); The grout discharging holes (31) are arranged along the circumferential direction of the grout discharging head (32).

4. The side grouting device for cast-in-place pile according to claim 3, characterized in that: The grout discharging structure (3) further includes a check valve (33); The check valve (33) is arranged in the grout discharging head (32); The conduction direction of the check valve (33) is from the corrugated pipe (2) to the grout discharging head (32).

5. The side grouting device for bored piles according to claim 3, wherein: The grout discharging structure (3) further includes a rubber sheet (34); The rubber sheet (34) is sleeved on the grout discharging head (32); The rubber sheet (34) covers the grout discharging hole (31).

6. The side grouting device for cast-in-place pile according to claim 3, characterized in that: The grout discharging structure (3) further includes a protective cover (35) and a protective cap (36); The protective cover (35) covers the grout discharging head (32); The protective cap (36) is buckled on the protective cover (35) to form a cavity with the protective cover (35) for protecting the grout discharging hole (31).

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

8. A side grouting device for cast-in-place piles according to any one of claims 1 to 6, characterized in that: The ratio of the length of the corrugated pipe (2) to the length of the grout discharging structure (3) is: 0.9 - 1.3:1.

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